#!/usr/bin/perl

# smogrify - Copyright G. Finch (salsaman@gmail.com) 2003 - 2013
# Released under the GPL 3 or later - see file COPYING or www.gnu.org for details


##################################################################

# these MUST match with the definition in the GUI

$rfx_builder_multi="build-lives-rfx-plugin-multi";

$umask=0177;
# ->        -rw-------

$GUI_NAME="LiVES";

###################################################################

# default values

###################################################################
# Do not change these except for testing !

$background=1;
$version="2.4.8";
#$dyneversion="LIVES-20091209";

###################################################################



$uid=$>;
$gid=$);
$gid=~ s/\W.*//;

if ($^O eq "MSWin32") {
#TODO - get this from the registry when needed
#only if we installed perl ourselves
$installdir="C:\\Program Files\\LiVES";

push @INC,"$installdir\\lib";

use File::Path qw(make_path);

#TODO - get this from the registry when needed
    $login = getlogin;
    $home="C:\\users\\$login\\Application Data\\LiVES";

    $rc_filename="LiVES.ini";
    $lives_home_dir="$home\\Config";


# default temporary directory (can be overridden from the GUI)
    $default_tmpdir="$home\\livescache\\";
    $is_mingw=1;
    $nulfile="NUL";

    $encoder="ffmpeg_encoder";
    $smog_composite_command="composite.exe -quiet";
    $smog_convert_command="mgkvert.exe -quiet";

} else {
    $home=$ENV {"HOME"};
    $rc_filename=".lives";
    $lives_home_dir="$home/.lives-dir";

# default temporary directory (can be overridden from the GUI)
    $default_tmpdir="$home/livestmp/";
    $nulfile="/dev/null";

    $encoder="mencoder_encoder";
    $smog_composite_command="composite -quiet";
    $smog_convert_command="convert -quiet";

}


#$DEBUG_SMOGRIFY=1;


###################################################################

if (defined($ARGV[0])) {
    $command=$ARGV[0];

    unless($command eq "version") {
        my $rcfile="$home/$rc_filename";
        if (-f $rcfile) {
            $tmpdir=&rc_get("session_tempdir");

            if ($tmpdir eq ""||$command eq "report") {
                $tmpdir=&rc_get("tempdir");
                $priority=1;
                &rc_set("session_tempdir","$tmpdir");
                $priority=0;
            }

            if (! -d $tmpdir) {
                unless($command eq "report" || $command eq "set_pref") {
                    &mktmpdir;
                }

            }

        }
    }

    if (!caller||$command eq "save"||$command eq "plugin_clear") {
        if (defined $DEBUG_SM_CMDS) {
            print STDERR "command is $command\n";
        }

        if ($command eq "save" && $ARGV[1] eq "get_rfx") {
            $background=0;
        }


## blocking calls
        if ($command eq "get_pid_for_handle") {
            $handle=$ARGV[1];
            $curtmpdir="$tmpdir/$handle";

            if ($^O eq "MSWin32") {
                $pidfile="$curtmpdir/pid";
            } else {
                $pidfile="$curtmpdir/.pid";
            }

            if (defined(open IN,"< $pidfile")) {
                read IN,$target_pid,8;
                close IN;

                if ($target_pid eq NULL) {
                    print " ";
                    exit 1;
                }
            }
            print $target_pid;
            exit 0;
        }


        if ($command eq "stopsubsub"||$command eq "stopsubsubs"||$command eq "stop_audio") {
            $handle=$ARGV[1];
            $curtmpdir="$tmpdir/$handle";
            my $sig="KILL";
            if ($command eq "stop_audio") {
                $pidfile="$curtmpdir/.pidpb";
            } else {
                $pidfile="$curtmpdir/.pid";
                if (defined($ARGV[2])) {
                    $sig=$ARGV[2];
                }
            }
            $statusfile="$curtmpdir/.status";

            unless(-d "$curtmpdir") {
                exit 2;
            }

            if (defined(open IN,"< $pidfile")) {
                read IN,$target_pid,8;
                close IN;

                if ($target_pid eq NULL) {
                    exit 1;
                }

# make sure pidfile has same group and owner, otherwise exit
                @stat=stat($pidfile);
                if (!($uid==$stat[4]&&$gid==$stat[5])) {
                    die "Smogrify: Unable to stop process $target_pid.\n";
                }
                elsif($command eq "stopsubsub"||$command eq "stop_audio") {
# kill all subprocesses of target_pid, and target_pid
                    &kill_child_pids($target_pid,$sig);
                }
                elsif($command eq "stopsubsubs") {
# kill all subprocesses of target_pid, but not target_pid
                    smog_system("pgrep -P $target_pid > \"$tmpdir/.pids.$target_pid\" 2>/dev/null");
                    if (-s "$tmpdir/.pids.$target_pid"&&defined(open IN,"$tmpdir/.pids.$target_pid")) {
                        while (<IN>) {
                            $pid=$_;
                            chomp($pid);
                            &kill_child_pids($pid,$sig);
                        }
                        close IN;
                    }
                    unlink "$tmpdir/.pids.$target_pid";
                }



                else {
                    print "Attempting to stop process ".$target_pid." with $command\n";
                    if ($sig eq "KILL") {
                        smog_system("kill -$sig $target_pid >/dev/null 2>&1");
                    } else {
                        smog_system("pkill -$sig -P $target_pid");
# must not ! >/dev/null 2>&1");
                    }
                }

                if ($sig eq "KILL" && $command ne "stop_audio") {
                    &sig_killed;
                }
                exit 0;
            }
            exit 1;
        }



        if ($command eq "new") {
# $key can normally be set to getpid()

            $key=$ARGV[1];

# write mini-info file

            if ($^O eq "MSWin32") {
                $infofile="$tmpdir/info.$key";
            }
            else {
                $infofile="$tmpdir/.info.$key";
            }
            do {
                $handle=int(rand 1000000000)+65536;
                $curtmpdir="$tmpdir/$handle";
            } while (-d $curtmpdir);

            umask 0;
            unless (mkdir $curtmpdir,0777) {
                sig_system_error("Creating directory \"$curtmpdir\"",0);
                exit 1;
            }
            umask $umask;

            if (!defined(open OUT,"> $infofile")) {
                sig_write_error("$infofile",0);
                exit 1;
            }

            print OUT $handle;
            close OUT;
            exit 0;
        }


        if ($command eq "get_tempdir") {
# TODO - take dirname as second param
            if (defined($ARGV[1])) {
                $id=$ARGV[1];

                if ($^O ne "MSWin32") {
                    open OUT,"> /tmp/.smogrify.$id" or exit 1;
                } else {
                    open OUT,"> C:\\smogrify.$id" or exit 1;
                }
                print OUT "$tmpdir";
                close OUT;
            } else {
                print $tmpdir
            };
            exit 0;
        }

        if ($command eq "get_version_hash") {
            $com=$ARGV[1];
            $sep=$ARGV[2];
            $piece=$ARGV[3];
            $res=smog_system_direct("$com");
            chomp($res);

            $ver=(split(/$sep/,$res))[$piece];

            print &version_hash($ver);
            exit 0;
        }

        if ($command eq "report") {

            $gui_bootstrap_file="";
            if (defined($ARGV[1])) {
                $gui_bootstrap_file=$ARGV[1];
            }

            if (! -d "$lives_home_dir") {
# this can fail here, but succeed later
                if ($^O ne "MSWin32") {
                    smog_system("/bin/mkdir -p -m 777 \"$lives_home_dir\"");
                } else {
                    make_path("$lives_home_dir");
                }
            }

            $startup_phase=0;

            $video_open_command="\"".&get_mplayer_location."\"";

            $audio_player="sox";
            $audio_play_command=&rc_get_default("sox_command");

            $convert_version_hash=&get_convert_version_hash;

            if ($audio_play_command eq "") {
                $audio_player="mplayer";
                $audio_play_command=&rc_get_default("mplayer_audio_command");
            }

# get $tmpdir from .rc file, if no .rc file, create it
            if (! -s "$home/$rc_filename") {
# set comment at start of file
                &rc_set("","");
                $startup_phase=-1;
                &rc_set("startup_phase",-1);
            } else {
                $startup_phase=&rc_get("startup_phase");
                if ($startup_phase eq "" || $startup_phase eq "100") {
                    $startup_phase=0;
                    &rc_delete("startup_phase");
                }
            }

            $default_keymap="default.keymap";

            &rc_set_if_not_set("version","$version");
            &rc_set_if_not_set("tempdir","$default_tmpdir");

            if (defined($dyneversion)) {
                &rc_set_if_not_set("lib_dir","/opt/$dyneversion/lib/");
                &rc_set_if_not_set("prefix_dir","/opt/$dyneversion/");
            }

            &rc_set_if_not_set("video_open_command","$video_open_command");
            &rc_set_if_not_set("audio_play_command","$audio_play_command");
            &rc_set_if_not_set("audio_player",$audio_player);
            &rc_set_if_not_set("midisynch","false");
            &rc_set_if_not_set("pb_quality",2);
            &rc_set_if_not_set("insert_resample","true");
            &rc_set_if_not_set("open_compression_percent",15);
            &rc_set_if_not_set("conserve_space","false");
            &rc_set_if_not_set("antialias","true");
# resize action when opening images - can be either: "bound" or "none"
            &rc_set_if_not_set("image_resize_action","none");
            &rc_set_if_not_set("encoder",$encoder);
            &rc_set_if_not_set("output_type","mjpeg");
            &rc_set_if_not_set("audio_effect","none");
            &rc_set_if_not_set("default_image_format","png");
            &rc_set_if_not_set("default_fps",25);
            &rc_set_if_not_set("save_directories","false");
            &rc_set_if_not_set("stop_screensaver","true");
            &rc_set_if_not_set("open_maximised","true");
            &rc_set_if_not_set("filesel_maximised","true");
            &rc_set_if_not_set("show_recent_files","true");
            &rc_set_if_not_set("ce_maxspect","true");
            &rc_set_if_not_set("lives_warning_mask",797696);
# bits 19,18,13,11 and 10
            &rc_set_if_not_set("dl_bandwidth_K",512);
            &rc_set_if_not_set("show_player_stats","false");
            &rc_set_if_not_set("show_toolbar","true");
            &rc_set_if_not_set("encoder_acodec",1);
# default of PCM
            &rc_set_if_not_set("record_opts",-1);

            &rc_set_if_not_set("gui_theme","crayons");
            &rc_set_if_not_set("jack_opts",0);
# start aserver on startup
            &rc_set_if_not_set("audio_opts",3);
            &rc_set_if_not_set("rte_keys_virtual",9);

            &rc_set_if_not_set("instant_open","true");
            &rc_set_if_not_set("auto_deinterlace","true");
            &rc_set_if_not_set("auto_trim_pad_audio","true");
            &rc_set_if_not_set("auto_cut_borders","false");

            &rc_set_if_not_set("mt_undo_buf",32);
            &rc_set_if_not_set("mt_enter_prompt","true");
            &rc_set_if_not_set("render_prompt","true");
            &rc_set_if_not_set("mt_exit_render","true");
            &rc_set_if_not_set("mt_def_width",640);
            &rc_set_if_not_set("mt_def_height",480);
            &rc_set_if_not_set("mt_def_achans",2);
            &rc_set_if_not_set("mt_def_signed_endian",2*!&get_endian);
            &rc_set_if_not_set("mt_backaudio","1");
            &rc_set_if_not_set("mt_pertrack_audio","true");
            &rc_set_if_not_set("mt_auto_back",120);

            &rc_set_if_not_set("ar_clipset","");
            &rc_set_if_not_set("ar_layout","");

            &rc_set_if_not_set("rec_desktop_audio","false");
            &rc_set_if_not_set("osc_start","false");
            &rc_set_if_not_set("osc_port",49999);

            &rc_set_if_not_set("concat_images","true");
            &rc_set_if_not_set("mouse_scroll_clips","true");

            &rc_set_if_not_set("omc_dev_opts",3);

            &rc_set_if_not_set("rec_stop_gb",10);

            &rc_set_if_not_set("def_autotrans","chroma blend");
            &rc_set_if_not_set("audio_src",0);
#internal

            &rc_set_if_not_set("ce_thumb_mode","true");

            &rc_set_if_not_set("show_button_icons","false");

            &rc_set_if_not_set("max_disp_vtracks",5);

            $tmpdir=&rc_get("tempdir");
            &write_bootstrap_file;
            &mktmpdir;

            $convert_old_version=&rc_get("convert_version");
            unless($convert_old_version eq $convert_version) {
                &rc_set("convert_version",$convert_version);
            }
            &version_check_and_upgrade;

            unless($gui_bootstrap_file eq "") {
                open OUT,"> $gui_bootstrap_file" or exit 4;
                print OUT "$version|$tmpdir|$startup_phase|$msg|$msg2";
                close OUT;
            }

#make sure we can write to tempir
            open OUT,"> $tmpdir/testfile" or exit 5;
            close OUT;
            unlink "$tmpdir/testfile";

            exit 0;
        }

        if ($command eq "set_clip_value") {
            $prefs_file=$ARGV[1];
            shift(@ARGV);
            $command="set_pref";
        }


        if ($command eq "set_pref") {
            $key=$ARGV[1];
            $value=$ARGV[2];

            &rc_set("$key","$value");
            exit 0;
        }

        if ($command eq "set_pref_if_not_set") {
            $key=$ARGV[1];
            $value=$value=$ARGV[2];
            &rc_set_if_not_set("$key","$value");
            exit 0;
        }



        if ($command eq "get_clip_value") {
            $command="get_pref";
            $prefs_file=$ARGV[4];
        }


        if ($command eq "print_pref") {
            $command="get_pref";
            $ARGV[2]="-";
        }

        if ($command eq "get_pref") {
            $key=$ARGV[1];
            if (defined($ARGV[2])) {
                $first=$ARGV[2];
            } else {
                $first=$uid;
            }
            if (defined($ARGV[3])) {
                $second=$ARGV[3];
            } else {
                $second=$gid;
            }
            $value=&rc_get($key,$home);

            if ($first eq "-"&&!defined($ARGV[3])) {
                print $value;
                exit 0;
            }
            if ($^O eq "MSWin32") {
                open OUT,"> $tmpdir/smogval.$first.$second" or exit 1;
            } else {
                open OUT,"> $tmpdir/.smogval.$first.$second" or exit 1;
            }
            print OUT $value;
            close OUT;
            exit 0;
        }

        if ($command eq "get_pref_default") {
            $key=$ARGV[1];
            if (defined($ARGV[2])) {
                $first=$ARGV[2];
            } else {
                $first=$uid;
            }
            if (defined($ARGV[3])) {
                $second=$ARGV[3];
            } else {
                $second=$gid;
            }
            $value=&rc_get_default($key);

            if ($value eq "") {
                $value="NULL";
            }

            if ($^O eq "MSWin32") {
                open OUT,"> $tmpdir/smogval.$first.$second" or exit 1;
            } else {
                open OUT,"> $tmpdir/.smogval.$first.$second" or exit 1;
            }
            print OUT $value;
            close OUT;
            exit 0;
        }

        if ($command eq "delete_pref") {
            $key=$ARGV[1];
            &rc_delete($key);
        }

        if ($command eq "get_location") {
            $exe=$ARGV[1];
            if (defined($ARGV[2])) {
                $first=$ARGV[2];
            } else {
                $first=$uid;
            }
            if (defined($ARGV[3])) {
                $second=$ARGV[3];
            } else {
                $second=$gid;
            }
            $value=&location($exe);

            if ($^O eq "MSWin32") {
                open OUT,"> $tmpdir/smogval.$first.$second" or exit 1;
            } else {
                open OUT,"> $tmpdir/.smogval.$first.$second" or exit 1;
            }

            print OUT $value;
            close OUT;
            exit 0;
        }


        if ($command eq "pause") {
            if ($^O eq "MSWin32") {
                $smres=smog_system("touch.exe \"$tmpdir\\$ARGV[1]\\pause\"");
                if ($smres) {
                    sig_write_error("$tmpdir\\$ARGV[1]\\pause");
                    exit 1;
                }
            } else {
                $smres=smog_system("touch \"$tmpdir/$ARGV[1]/pause\"");
                if ($smres) {
                    sig_write_error("$tmpdir/$ARGV[1]/pause");
                    exit 1;
                }
            }
            if ($^O eq "MSWin32") {
#smog_system("chmod.exe 600 \"$tmpdir\\$ARGV[1]\\pause\"");
            } else {
                smog_system("/bin/chmod 600 \"$tmpdir/$ARGV[1]/pause\"");
            }
            exit 0;
        }


        if ($command eq "resume") {
            unlink "$tmpdir/$ARGV[1]/pause";
            exit 0;
        }


        if ($command eq "clear_tmp_files") {
            $handle=$ARGV[1];
#clear old backups (e.g. when saving a set)
            $curtmpdir="$tmpdir/$handle";
            &clean_old;
            &sig_complete;
            exit 0;
        }

        if ($command eq "clear_pre_files") {
            $handle=$ARGV[1];
#clear old backups (e.g. when saving a set)
            $curtmpdir="$tmpdir/$handle";
            smog_chdir("$curtmpdir");
            unlink glob "*.pre";
            &sig_complete;
            exit 0;
        }


        if ($command eq "undo_audio") {
            $handle=$ARGV[1];
            $curtmpdir="$tmpdir/$handle";
            if ($^O eq "MSWin32") {
                $statusfile="$curtmpdir/status";
            } else {
                $statusfile="$curtmpdir/.status";
            }

            &undo_audio;
# will abort on failure
            &sig_complete;
            exit 0;
        }

        if ($command eq "backup_audio") {
            $handle=$ARGV[1];
            $curtmpdir="$tmpdir/$handle";
            if ($^O eq "MSWin32") {
                $statusfile="$curtmpdir/status";
            } else {
                $statusfile="$curtmpdir/.status";
            }
            smog_chdir("$curtmpdir");
            &backup_audio;
            if ($panic) {
                exit 1;
            }
            &sig_complete;
            exit 0;
        }


        if ($command eq "save_frame") {
            my $hsize=-1;
            my $vsize=-1;

            $handle=$ARGV[1];
            $curtmpdir="$tmpdir/$handle";
            $frame=$ARGV[2];
            $name=&mkname($frame);
            $nfile=$ARGV[3];
            if (defined $ARGV[4]) {
                $hsize=$ARGV[4];
            }
            if (defined $ARGV[5]) {
                $vsize=$ARGV[5];
            }

            if ($^O eq "MSWin32") {
                $statusfile="$curtmpdir/status";
            } else {
                $statusfile="$curtmpdir/.status";
            }

# check the file is writable
            unless(&is_writeable($nfile)) {
                &sig_error("Unable to open output file !","$GUI_NAME could not write to $nfile.");
            }

            $img_ext=&get_img_ext($curtmpdir,$frame);
            $img_prefix=&get_img_prefix($img_ext);

            umask 0111;

            if ($hsize==-1||$vsize==-1) {
                $com="$smog_convert_command $img_prefix\"$curtmpdir/$name$img_ext\" \"$nfile\" >$nulfile 2>&1";
            } else {
                if ($antialias eq "false") {
                    $com="$smog_convert_command +antialias $img_prefix\"$curtmpdir/$name$img_ext\" -scale $hsize"."x"."$vsize\\! \"$nfile\" > $nulfile 2>&1";
                } else {
                    $com="$smog_convert_command -antialias $img_prefix\"$curtmpdir/$name$img_ext\" -resize $hsize"."x"."$vsize\\! \"$nfile\" > $nulfile 2>&1";
                }
            }

            $smerr=smog_system($com);
            if ($smerr) {
                sig_system_error("$com",$smerr);
                exit 1;
            };

            exit 0;
        }


        if ($command eq "restore_details") {
            $handle=$ARGV[1];
            $nfile=$ARGV[2];
            $leave_headers=$ARGV[3];

            $curtmpdir="$tmpdir/$handle";

            if ($^O eq "MSWin32") {
                $statusfile="$curtmpdir/status";
            } else {
                $statusfile="$curtmpdir/.status";
            }

            smog_chdir("$curtmpdir");
            $fsize= -s "$nfile";
            $afsize = -s "audio";
            unlink glob "*.tar";
            unlink glob "event.*";
            unlink "extended";

            $img_type="jpg";

            unless(-f "header.lives") {

                if (defined(open IN,"< header2")) {
                    read IN,$val,4;

# unfortunately...old clips used whatever endian the machine used
                    $endian=&get_endian;
                    $frames=&getint($val);
                    read IN,$title,256;
                    read IN,$author,256;
                    read IN,$comment,256;
                }

                $title=~ tr/\x00//d;
                       $author=~ tr/\x00//d;
                               $comment=~ tr/\x00//d;

# very old backups didn't have a header2
                if (! -f "header2") {
                    unless ($nfile eq "") {
                        unlink glob "event.*";
                        $img_ext=&get_img_ext($curtmpdir);
                        $img_prefix=&get_img_prefix($img_ext);
                        $frames=&count_frames;
                    }
                }

# leave headers for restoring VJ sets
                if ($leave_headers==1) {
                    $fsize=0;
                }
                else {
                    unlink <header header2>;
                }
            }
            else {
                unlink <header header2>;
            }

            $name=&mkname(1);

            if (-f "$name.png") {
                $img_type="png";
            }

            &sig_complete($fsize,$afsize,$img_type,$frames,"$title","$author","$comment");
            exit 0;
        }

        if ($command eq "list_plugins") {

# prefix_dir pref should be set first
# plugins are returned in sort() order
            my $allow_nonex=$ARGV[1];
            my $allow_subdirs=$ARGV[2];
            my $plugindir=$ARGV[3];
            my $ext=$ARGV[4];

            my $string="";

            if ($ext =~ /^-/) {
                $strip_ext=1;
                $ext=substr($ext,1,length($ext));
            }

            if (-d $plugindir) {
                smog_chdir("$plugindir");
                opendir DIR,$plugindir;
                my @files=readdir(DIR);
                closedir DIR;
                @files = sort (@files);

                foreach my $plugname (@files) {
                    unless ($plugname =~ /^\./) {
                        if ((-f $plugname && (-x $plugname||$allow_nonex))||($allow_subdirs==1&& -d $plugname)) {
                            unless($allow_nonex) {
                                next if ! -x "$plugindir/$plugname";
                        }
                        unless ($plugname eq "") {
                                if ($ext eq ""|| $plugname =~ /$ext$/) {
                                    if ($strip_ext==1) {
                                        $plugname=(split(/\./,$plugname))[0];
                                    }
                                    $string.="$plugname|";
                                }
                            }
                        }
                    }
                }
            }
            else {
                print "\n";
                exit 1;
            }
            print "$string\n";
            exit 0;
        }


        if ($command eq "build_rfx_plugins") {
            if ($^O ne "MSWin32") {
                if (&location($rfx_builder_multi) eq "") {
                    &sig_error("Unable to locate the program $rfx_builder_multi");
                    exit 1;
                }
            }

            $type=$ARGV[1];
            $script_dir=$ARGV[2];
            $exec_dir=$ARGV[3];
            if ($^O ne "MSWin32") {
                smog_system("$rfx_builder_multi \"$type\" \"$script_dir\" \"$exec_dir\"");
            }
            else {
                smog_system("perl \"$installdir\\$rfx_builder_multi\" \"$type\" \"$script_dir\" \"$exec_dir\"");
            }
            exit 0;
        }



        if ($command eq "make_thumb") {
            $handle=$ARGV[1];
            $curtmpdir="$tmpdir/$handle";
            if ($^O eq "MSWin32") {
                $statusfile="$curtmpdir/status";
            }
            else {
                $statusfile="$curtmpdir/.status";
            }
            $dwidth=$ARGV[2];
            $dheight=$ARGV[3];
            $img_ext=".".$ARGV[4];
            $img_prefix=&get_img_prefix($img_ext);
            $file=$ARGV[5];

            if (! -d "$curtmpdir") {
                mkdir ("$curtmpdir",0700);
            }

            $antialias=&rc_get("antialias");

            $imresact="bound";
            &get_image_size("$file");
            if ($panic) {
                exit 1;
            }
            if (!($vsize*$hsize)||$hsize==-1) {
                &sig_complete(0,0);
                exit 0;
            }

            smog_chdir("$curtmpdir");

            $name=&mkname(1);

            if ($antialias eq "false") {
                smog_system("$smog_convert_command +antialias \"$file\" -scale $hsize"."x"."$vsize\\! $img_prefix\"$curtmpdir/$name$img_ext\" > $nulfile 2>&1");
            }
            else {
                smog_system("$smog_convert_command -antialias \"$file\" -resize $hsize"."x"."$vsize\\! $img_prefix\"$curtmpdir/$name$img_ext\" > $nulfile 2>&1");
            }
            &sig_complete($hsize,$vsize);
            exit 0;
        }


        if ($command eq "version"&&!caller) {
            print "smogrify $version\n";
            exit 0;
        }


        if ($command eq "plugin_clear") {
# this is a special function which does general cleanup
# and then does the "clear" command in the plugin
# non-perl plugins have to implement this command themselves
#
            $handle=$ARGV[1];
            $curtmpdir="$tmpdir/$handle";
            if ($^O eq "MSWin32") {
                $statusfile="$curtmpdir/status";
            }
            else {
                $statusfile="$curtmpdir/.status";
            }
            smog_chdir("$curtmpdir");
            $start=$ARGV[2];
            $end=$ARGV[3];
            $plugdir=$ARGV[4];
            $type=$ARGV[5];
            $rest=$ARGV[6];
            $plugin="";


            unless ($rest eq "") {
                $plugin="$plugdir$type/$rest";
            }

            if ($type eq "encoders" || $type eq "effects/rendered/") {
                $img_ext=&get_img_ext($curtmpdir,$start);
                $img_prefix=&get_img_prefix($img_ext);
                if ($type eq "encoders") {
                    if (-f "audio.origbak") {
                        unlink "audio";
                        smog_rename( "audio.origbak","audio");
                    }
                    $areq=&get_form_request($plugin);
                    if ($areq&1||$areq&2) {
                        unlink <audiodump.wav audioclip>;
                    }
                    if ($areq&4) {
                        if ($^O ne "MSWin32") {
# TODO **** !!!!!
                            &clear_symlinks;
                        }
                    }
                }
            }

#need this again - something resets us
            smog_chdir("$curtmpdir");

            if ($^O eq "MSWin32") {
# filter by file ext
                my $ext=&get_ext("$plugin");
                if ($ext eq ".py") {
                    $cmd="python";
                }
                else {
                    $cmd="perl";
                }
                $com="$cmd \"$plugin\" clear $start $end $img_ext";
            }
            else {
                $com="\"$plugin\" clear $start $end $img_ext";
            }

            $smerr=smog_system($com);
            if ($smerr) {
                sig_system_error("Command failed: $com",$smerr);
                exit 1;
            }
            &sig_complete;
            exit 0;
        }



        if ($command eq "check_for_lock") {
#TODO - mingw

# check if there is a lock file for a set, and if so is it in use
            my $setname=$ARGV[1];
            my $exename=$ARGV[2];
            my $pid=$ARGV[3];

            opendir DIR,"$tmpdir/$setname";

            while (my $file=readdir(DIR)) {
                if ($file=~/^lock\.(.*)/) {
#found a lockfile
                    my $proc=$1;
                    unless ($proc eq $pid) {
                        my $exe=smog_system_direct("/bin/readlink -n /proc/$proc/exe");  #allowed to fail
                        my $short_exe=&my_basename($exe);

                        if ($short_exe eq $exename) {
# and it's in use
                            closedir DIR;
                            print $proc."\n";
                            exit 0;
                        }
                        unlink "$tmpdir/$setname/$file";
                    }
                }
            }
            closedir DIR;
            exit 0;
        }




#TODO - mingw
        if ($command eq "get_recovery_file") {
#find first non-in-use recovery file for given uid, gid and filepart
            my $uid=$ARGV[1];
            my $gid=$ARGV[2];
            my $exename=$ARGV[3];
            my $filepart=$ARGV[4];
            opendir DIR,"$tmpdir";

            while (my $file=readdir(DIR)) {
                if ($file=~/^$filepart\.$uid\.$gid\.(.*)/) {
                    if (-z $file) {
                        unlink "$file";
                    } else {
                        my $exe=smog_system_direct("/bin/readlink -n /proc/$1/exe");
#allowed to fail
                        my $short_exe=&my_basename($exe);

                        unless($short_exe eq $exename) {
                            $output=(split /\./,$file)[-1];
                            print $output;
                            closedir DIR;
                            exit 0;
                        }
                    }
                }
            }
            print 0;
            closedir DIR;
            exit 0;
        }

#TODO - mingw
        if ($command eq "clean_recovery_files") {
#remove non-in-use recovery/layout files for given uid, gid
            my $uid=$ARGV[1];
            my $gid=$ARGV[2];
            my $exename=$ARGV[3];
            opendir DIR,"$tmpdir";

            smog_chdir("$tmpdir");

            while (my $file=readdir(DIR)) {
                if ($file=~/^recovery\.$uid\.$gid\.(.*)/ || $file=~/^layout\.$uid\.$gid\.(.*)/ || $file=~/^layout_numbering\.$uid\.$gid\.(.*)/) {
                    my $exe=smog_system_direct("/bin/readlink -n /proc/$1/exe");
#allowed to fail
                    my $short_exe=&my_basename($exe);
                    unless($short_exe eq $exename) {
                        unlink "$file";
                    }
                }
            }
            closedir DIR;
            exit 0;
        }


        if ($command eq "get_next_in_set") {
# this is a special function for lives-exe. It will look for
# clips on the disk that have the marker file "set.$name"
# only used now for pre 0.9.6 versions

            $last=$ARGV[1];
            $setname=$ARGV[2];
            $pid=$ARGV[3];

            opendir DIR,"$tmpdir";
            @allfiles=readdir(DIR);
            closedir DIR;

            foreach my $subdir(@allfiles) {
                if (-f "$tmpdir/$subdir/set.$setname") {
                    if ($last eq "none") {
                        $found=$subdir;
                        last;
                    }
                    if ($last eq $subdir) {
                        $last="none";
                    }
                }
            }

            if ($found eq "") {
                $found="none";
            }

            if ($^O eq "MSWin32") {
                $infofile="$tmpdir/info.$pid";
            } else {
                $infofile="$tmpdir/.info.$pid";
            }
            smog_system_sync();

            if (-d $tmpdir) {
                open OUT,"> $infofile";
                print OUT $found;
                close OUT;
            }
            exit 0;
        }


        if ($command eq "cleanup"||$command eq "weed") {
            smog_chdir("$tmpdir");
            print "Cleaning up temporary space for $GUI_NAME.\n";
            if ($command eq "cleanup") {
                if ($^O ne "MSWin32") {
                    unlink "/tmp/.smogval*";
# TODO *** !!!!!!!!!!
                }
                unlink glob "* .* *.*";
# will not remove directories
            } else {
                $new_temp=$ARGV[1];
                unless($new_temp eq "") {
# here is where we create a new temp directory
                    unless(-d $new_temp||(mkdir $new_temp,0777)) {
                        print "Smogrify: Unable to create new directory $new_temp!\n";
                        exit 1;
                    }
                    print "Smogrify: moving sets from $tmpdir to $new_temp\n";
                }
                else {
                    print "Smogrify: Leaving sets intact.\n";
                }
                &weed(0);
            }
            exit 0;
        }

        if (substr($command,0,7) eq "fxinit_") {
# call onchange_init
            $command=substr($command,7);
            $handle=$ARGV[1];

            $dir=$ARGV[2];

            $width=$ARGV[3];
            $height=$ARGV[4];

            $plugin_name="$dir/$command";
            shift;
            shift;
            shift;
            shift;

            $curtmpdir="$tmpdir/$handle";

            $ARGV[0]="onchange_init";
            require("$plugin_name");
            exit 0;
        }



        if ($command eq "count_frames") {
            $img_ext=".".$ARGV[2];
            print &count_frames;
            exit 0;
        }


        if ($command eq "get_proj_set") {
            my $proj_file=$ARGV[1];
            my $out=smog_system_direct("tar --exclude=*/* -tzf $proj_file");
            unless($out=~/\/$/) {
                exit 1;
            }
            chomp $out;
            chop $out;
            print $out;

            exit 0;
        }

        if ($command eq "mv_pre") {
            $handle=$ARGV[1];
            $curtmpdir="$tmpdir/$handle";
            if ($^O eq "MSWin32") {
                $statusfile="$curtmpdir/status";
            } else {
                $statusfile="$curtmpdir/.status";
            }
            unlink "$curtmpdir/pause";
            $start=$ARGV[2];
            $end=$ARGV[3];
            $img_ext=".".$ARGV[4];
            &mv_pre;
            if ($panic) {
                exit 1;
            }
            &sig_complete;
            exit 0;
        }



        if ($command eq "clear_symlinks") {
            $handle=$ARGV[1];
            &clear_symlinks;
            exit 0;
        }



####################################################################
        if ($^O ne "MSWin32") {
# run the rest in background
            if ($background==1) {
                if (fork()) {
                    exit 0;
                }
            }
        }
####################################################################
        umask $umask;

        if (!caller&&(!defined($ARGV[1]) || $ARGV[1] eq "")) {
            &usage;
            exit 1;
        }

        $handle=$ARGV[1];

        $curtmpdir="$tmpdir/$handle";

        if ($^O eq "MSWin32") {
            $statusfile=$curtmpdir."/status";
        } else {
            $statusfile=$curtmpdir."/.status";
        }

        if ($command eq "play"||$command eq "play_opening_preview") {
            if ($^O eq "MSWin32") {
                $pidfile=$curtmpdir."/pidpb";
            } else {
                $pidfile=$curtmpdir."/.pidpb";
            }
        } else {
            if ($^O eq "MSWin32") {
                $pidfile=$curtmpdir."/pid";
            } else {
                $pidfile=$curtmpdir."/.pid";
            }
        }

        if ($command eq "play_opening_preview") {
# play_opening_preview is exactly like play
# except our audio filename is different
            $opening_preview=1;
            $command="play";
        }


        unless($command eq "keep"||$command eq "close") {
# tell the world our pid
            &sig_pid;
        }


        if ($command eq "play") {
            $endian=&get_endian;

            $fps=$ARGV[2];
            if ($fps==0) {
                $fps=&rc_get("default_fps");
            }

            $start=$ARGV[3];
            $end=$ARGV[4];


            $loop=0;
            if ($ARGV[5]!=0) {
                $loop=$ARGV[5];
            }


            if (!defined $ARGV[6]||$ARGV[6]==0) {
                $arate=44100;
            } else {
                $arate=$ARGV[6];
            }
            if (!defined $ARGV[7]||$ARGV[7]==0) {
                $achans=2;
            } else {
                $achans=$ARGV[7];
            }

            if (!defined $ARGV[8]||$ARGV[8]==0) {
                $asamps=2;
                $stype="w";
            } else {
                $asamps=$ARGV[8];
                if ($asamps>7) {
                    $asamps/=8;
                }
            }
            if (!defined $ARGV[9]) {
                $signed=1;
            } else {
                $signed=$ARGV[9];
            }

            if (!defined $ARGV[10]) {
                $aendian=$endian;
            } else {
                $aendian=$ARGV[10];
            }

            if (defined($opening_preview)) {
                $aformat=".raw";
                $audiofile="$curtmpdir/audiodump.pcm";
            } else {
                $aformat=".raw";
                $audiofile="$curtmpdir/audio";
            }


            $audio_player=&rc_get("audio_player");

            if (-f $audiofile && $arate) {

                $audio_start=($start-1)/$fps;
                $audio_end=$end/$fps;

                $mute="";
                if ($arate<0) {
                    $mute=" -ao null  ";
                    $arate=-$arate;
                    if ($audio_player eq "sox") {
                        $mute=" -v 0 ";
                    }
                }

                $audio_play_command=&rc_get("audio_play_command");

                if ($audio_play_command eq "" or $audio_play_command eq '""') {
                    $time=($audio_end-$audio_start);
                    select(undef, undef, undef, $time);
                }
                elsif($audio_player eq "sox") {
                    $audio_effect=&rc_get("audio_effect");
                    $trimcom=" trim $audio_start";

                    if (($audio_end>$audio_start)&&$end>0) {
                        $trimcom .= " ".($audio_end-$audio_start);
                    } else {
                        $trimcom .=" 10000000";
                    }

                    if ($signed==1) {
                        $signed="s";
                    } else {
                        $signed="u";
                    }

                    if ($aendian==$endian) {
                        $aendian="";
                    } else {
                        $aendian="-x";
                    }

                    if ($audio_effect eq "flanger1") {
                        $audio_effect="flanger 0.6 0.87 3.0 0.9 0.5 -s";
                    }
                    elsif($audio_effect eq "echo1") {
                        $audio_effect="echo 0.8 0.9 1000.0 0.3";
                    }
                    elsif($audio_effect eq "chorus1") {
                        $audio_effect="chorus 0.6 0.9 50.0 0.4 0.25 2.0 -t 60.0  0.32  0.4 1.3 -s";
                    }
                    elsif($audio_effect eq "reverb1") {
                        $audio_effect="reverb 1.0 600.0 180.0 200.0";
                    }
                    elsif($audio_effect eq "phaser1") {
                        $audio_effect="phaser 0.89 0.85 1.0 0.24 2.0 -t";
                    }
                    else {
                        $audio_effect="";
                    }
                    $sox_version=&get_sox_version;

                    if ($sox_version<13000000) {
                        if ($asamps==1) {
                            $stype="b";
                        }
                        elsif($asamps==2) {
                            $stype="w";
                        }
                        $aformat=".".$signed.$stype;
                        $syscom2="$audio_play_command $mute -c $achans -r $arate -$signed $aendian -t $aformat -$stype $audiofile $trimcom $audio_effect";
                    } else {
                        $syscom2="$audio_play_command $mute -c $achans -r $arate -$signed $aendian -t $aformat -$asamps $audiofile $trimcom $audio_effect";
                    }
                }
                else {
# mplayer seemingly has no easy way of playing unsigned or wrong endian
                    $syscom2="$audio_play_command -demuxer rawaudio -rawaudio rate=$arate :channels=$achans:samplesize=$asamps $mute $audiofile -ss ".
                             ($audio_start-1);
                }
            }

            $showed_err=0;

            do {
                if (! -d "$curtmpdir" || -f "$curtmpdir/.stoploop" || -f "$curtmpdir/stoploop" || ! -f $audiofile) {
                    $loop=0;
                } else {
                    $syscom3=$syscom2.">$nulfile 2>&1";
                    $retval=smog_system("$syscom3");
                    if ($retval>255) {
                        unless($showed_err) {
                            print STDERR "Error playing audio !\n";
                            print STDERR "Failed command was: $syscom2\n";
                            smog_system("$syscom2");
                            $showed_err=1;
                        }
                    }
                }
            } while ($loop);
            &sig_complete_audio;

            unlink "$curtmpdir/.stoploop";
            unlink "$curtmpdir/stoploop";

            exit 0;
        }


        if ($command eq "open_test") {
            $command="open";
            $opentest=1;
        }


        if ($command eq "open") {

            unlink "$curtmpdir/pause";

            $file=$ARGV[2];
            $ss="";

            $withsound=$ARGV[3];

            if (defined($ARGV[4])) {
                $img_ext=".".$ARGV[4];
            }

            if (defined($ARGV[5]) && $ARGV[5] > 0) {
                $ss=" -ss $ARGV[5] ";
            }
            $frames="";
            if (defined($ARGV[6]) && $ARGV[6] > 0) {
                $ARGV[6]++;
# cf below, we remove 1st frame
                $frames=" -frames $ARGV[6] ";
            }
            $extra_params=$ARGV[7];
            $band="";
            if ($extra_params eq "nobandwidth") {
                $extra_params="";
            } else {
                if ($extra_params eq "sendbandwidth") {
                    $bandwidth=&rc_get("dl_bandwidth_K");
                    if ($bandwidth eq "") {
                        $bandwidth=64;
                    }
                    $band="-bandwidth $bandwidth"."000";
                    $extra_params="";
                }
            }
            $compression=&rc_get("open_compression_percent");
            if ($compression eq "") {
                $compression=15;
            }

            smog_chdir("$curtmpdir");

            if (! -f "$file" && ! -d "$file") {
                &sig_error("$file","could not be found","$GUI_NAME was unable to open it.","Please check the file name and try again.");
            }


# let get_file_info set this
#$mplay_command=&rc_get("video_open_command");

# process video

# 3 other files we will use
            $curtmpfile="tempresult";
            $audio_out="audio";
            $audio_in="audiodump.pcm";

            if ($img_ext eq ".png") {
                $compression=int($compression/10.001)
            } else {
                $quality=int(100-$compression);
            }

            $xframes=$frames;

            my $wavhead=":nowaveheader";

            if ($file=~/:\/\//) {
                      $is_remote=2;
#$wavhead=""; # need wav header, as user will probably finish by
# quitting, thus we won't send full info
        }
    &get_file_info;

    if ($panic) {
            unlink "$pidfile";
            exit 1;
        }

        $aformnew="";
        if ($asamps==32) {
# cannot handle this yet, need to resample to s16
            if ($endian==1) {
                $aformnew="-format s16le";
            }
            else {
                $aformnew="-format s16be";
            }
            $asamps=16;
        }
#TODO - mingw
        $threads=smog_system_direct("/bin/grep processor /proc/cpuinfo | wc -l");
        $threads=int($threads);
        if ($threads==0) {
            $threads=1;
        }

        if ($type eq "jpeg" || $type eq "png") {
            $count=$frames;
        }
        else {
            $frames=$xframes;

            if ($achans eq "" || $achans eq "0") {
                $channs="";
            }
            else {
                $channs="-channels $achans";
            }

            if ($withsound eq "0") {
#video only
                if ($img_ext eq ".jpg") {
                    $syscom=$mplay_command . " -quiet $band -osdlevel 0 -vo jpeg:quality=$quality -lavdopts o=threads=$threads -fps 100000 $ss $frames -noframedrop -ao null \"$file\" $extra_params <$nulfile";
                }
                else {
                    $syscom=$mplay_command . " -quiet $band -osdlevel 0 -vo png:z=$compression:alpha -lavdopts o=threads=$threads -fps 100000 $ss $frames -noframedrop -ao null \"$file\" $extra_params <$nulfile";
                }
            }
            elsif ($withsound eq "1") {
#video and audio 
                if ($img_ext eq ".jpg") {
                    $syscom=$mplay_command . " -quiet $band -osdlevel 0 -vo jpeg:quality=$quality $ss -lavdopts o=threads=$threads -noframedrop $frames -ao pcm:fast$wavhead $channs $aformnew -mc 0  \"$file\" $extra_params <$nulfile";
                }
                else {
                    $syscom=$mplay_command . " -quiet $band -osdlevel 0 -vo png:z=$compression:alpha $ss -lavdopts o=threads=$threads -noframedrop $frames -ao pcm:fast$wavhead $channs $aformnew -mc 0  \"$file\" $extra_params <$nulfile";
                }
            }
            else {
#audio only 
                if ($ss eq "" && $frames eq "") {
                    $syscom=$mplay_command . " -quiet $band -vo null -vc null -ao pcm:fast$wavhead $aformnew $channs -mc 0 \"$file\" $extra_params <$nulfile";
                }
                else {
                    $syscom=$mplay_command . " -quiet $band -vo null $ss $frames -ao pcm:fast$wavhead $aformnew $channs -mc 0 \"$file\" $extra_params <$nulfile";
                }
            }
            if (defined($DEBUG_OPEN)) {
                print STDERR "open command for $handle is: $syscom\n";
            }

            $syscom2=$syscom." >\"$curtmpfile\" 2>$nulfile";

            unless ($opentest==1) {
                &sig_progress(0);
            }

            smog_system("$syscom2"); # this may well fail...we just have to use what we get back

            if (!-f $curtmpfile) {
                unlink $pidfile;
                exit 1;
            }

            @info=split /  /, smog_system_direct("grep VIDEO: \"$curtmpfile\" 2>$nulfile");
            @info2=split / /, smog_system_direct("grep AUDIO: \"$curtmpfile\" 2>$nulfile");

            unlink "$curtmpfile";
#$type=$info[1];

            $size=$info[2];
            $hsize=(split /x/,$size)[0];
            $vsize=(split /x/,$size)[1];
            $bpp=$info[3];
            chomp($bpp);

            $fps=(split / /,$info[4])[0];

            $arate=$info2[1];
            $achans=$info2[3];

            if (! -d $curtmpdir) {
#curtmpdir can be removed by cancel
                exit 1;
            }

            if ($withsound eq "-1") {
                $count=0;
            }
            else {
# double check number of frames
                $count=&count_frames;
            }
        }

# if the last frame has zero size, delete it
        if ($count>0) {

            $name=&mkname($count);
            while ($count > 0 && -f "$name$img_ext" && -z "$name$img_ext") {
                unlink "$name$img_ext";
                $name=&mkname(--$count);
            }
            if ($count==0) {
                if ($img_ext==".png") {
                    &sig_error("Your version of mplayer/ffmpeg may be broken","See http://bugzilla.mplayerhq.hu/show_bug.cgi?id=2071"," ","You can work around this by switching to jpeg output in Preferences/Decoding.");
                }
            }

# double check image size
            $name=&mkname(1);
            $imresact="none";
            &get_image_size("$name$img_ext");
            if ($panic||$hsize==-1) {
                unlink $pidfile;
                &sig_error;
            }
        }

        if (-f $audio_in) {
            smog_rename( "$audio_in","$audio_out");
            $af_size = -s $audio_out;
        }

        if ($img_ext eq ".png" || $type eq "png") {
            $bpp=32;
        }

        unless (0||$withsound ne "-1" || $achans==0) {
# try as best we can to sync sound and video for a selection
            $audio_out=&clip_audio(0.3,1000000.);
            if (!$panic) {
                smog_rename( "$audio_out","audio");
            }
            $audio_out="audio";
        }


        if ($count==0||$type eq "jpeg"||$type eq "png"||$type eq "Audio") {
# we could have audio or images
            if (-f $audio_out) {
# just in case...
                $type="Audio";
            }
            if (! -d $curtmpdir) {
#curtmpdir can be removed by cancel
                exit 1;
            }

            if ($af_size>0||$count>0) {
                &sig_complete($handle,$count,$type,$hsize,$vsize,$bpp,$fps,$f_size,$arate,$achans,$asamps,$signed,$endian,$af_size,$title,$author,$comment);
                exit 0;
            }
# should have audio then
            if (!($type eq "Audio")) {
                if (!defined($DEBUG_OPEN)&&$withsound>=0) {
                    print STDERR "\nFailed to open file - I tried:\n\n $syscom\n";
                    print STDERR "\nMaybe you are missing a library in mplayer (or it is not a valid media file) ?\n";
                }
                if ($^O eq "MSWin32") {
                    &sig_error("This does not appear to be a valid video or image file","$GUI_NAME was unable to open it."," ");
                }
                else {
                    &sig_error("This does not appear to be a valid video or image file","$GUI_NAME was unable to open it.","","Check the terminal window for more details.");
                }
            }
        }

# mplayer seems to sometimes output one extra frame for jpg
        if (defined($MPLAYER_EXTRA_OPEN_FRAME_BUG)&&($count==$xframes+1)&&(($frames eq "")||(!($frames eq "") && ($count<$ARGV[4])||($ARGV[3]==0)))) {
            $name=&mkname($count);
            unlink "$name$img_ext";
            $count--;
        }

        unless ($frames eq "") {
            $tfps=$fps;
            if ($fps<1) {
                $tfps=1;
            }
            if ($ARGV[3]>=(1/$tfps)) {
# if we opened a selection, mplayer wrongly outputs frame 1, 
# so we usually need to delete it

#TODO ** - check if this is still the case

                for ($i=2;$i<=$count;$i++) {
                    $from=&mkname($i);
                    $to=&mkname($i-1);
                    smog_rename( "$from$img_ext", "$to$img_ext");
                }
                $count--;
            }
        }

        $af_size= -s $audio_out;
        if (-d $curtmpdir) {
            &sig_complete($handle,$count,$type,$hsize,$vsize,$bpp,$fps,$f_size,$arate,$achans,$asamps,$signed,$endian,$af_size,$title,$author,$comment);
        }
        exit 0;
    }

    if ($command eq "get_details") {

        $handle=$ARGV[1];
        $curtmpdir="$tmpdir/$handle";


#attempt to get file details
        $file=$ARGV[2];
        $only_first=1;

        $img_ext=".".$ARGV[3];

        if (defined($ARGV[4])) {
            $is_remote=$ARGV[4];
        }
        if (defined($ARGV[5])) {
            $is_audio=$ARGV[5];
        }
        &get_file_info;
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }

        if ($asamps==32) {
# cant handle this yet, so we will resample on open
            $asamps=16;
        }

        smog_chdir("$curtmpdir");

        &sig_complete($handle,$count,$type,$hsize,$vsize,$bpp,$fps,$f_size,$arate,$achans,$asamps,$signed,$endian,$af_size,$title,$author,$comment);

        exit 0;
    }



    if ($command eq "open_tv_card") {
        $chanstr=$ARGV[2];
        $devstr=$ARGV[3];
        $fifofile=$ARGV[4];

        $inputstr=$sizestr=$fpsstr=$driverstr=$outfmt="";

        if (defined($ARGV[5])) {
            $inputstr=":input=$ARGV[5]";
        }
        if (defined($ARGV[6])&&defined($ARGV[7])) {
            if ($ARGV[6]>0&&$ARGV[7]>0) {
                $sizestr=":width=$ARGV[6]:height=$ARGV[7]";
            }
        }

        if (defined($ARGV[8])) {
            if ($ARGV[8]>0.) {
                $fpsstr=":fps=$ARGV[8]";
            }
        }

        if (defined($ARGV[9])) {
            if ($ARGV[9] ne "autodetect") {
                $driverstr=":driver=$ARGV[9]";
            }
        }

        if (defined($ARGV[10])) {
            if ($ARGV[10] ne "autodetect") {
                $outfmt=":outfmt=$ARGV[10]";
            }
        }

        my $mp=&get_mplayer_location;

## note does not function with mpv since it cannot convert to yuv4mpeg (complains about missing pixel_fmt)
        $com="$mp -really-quiet tv://$chanstr -tv device=$devstr$inputstr$driverstr$sizestr$outfmt$fpsstr -vo yuv4mpeg:file=$fifofile >$nulfile 2>&1 <$nulfile";
        $smerr=smog_system($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }
        exit 0;
    }



    if ($command eq "open_fw_card") {
        $cardno=$ARGV[2];
        $cache=$ARGV[3];
        $fifofile=$ARGV[4];
        my $mp=&get_mplayer_location;
## note does not function with mpv since it cannot convert to yuv4mpeg (complains about missing pixel_fmt)
        $com="dvgrab -s 0 -noavc -card $cardno -o - 2>$nulfile | $mp - -really-quiet -demuxer lavf -vo yuv4mpeg:file=$fifofile >$nulfile 2>&1";
        $smerr=smog_system("$com");
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }
        exit 0;
    }






    if ($command eq "close") {
        if (defined(open IN,"< $pidfile")) {
            close IN;
# cancel any processing
            if ($^O ne "MSWin32") {
                smog_system("smogrify stopsubsub \"$handle\"");
            }
        }
        if (chdir("$curtmpdir")) {
            unlink glob "* .* *.*";
            smog_chdir("$tmpdir");
            rmdir $curtmpdir;
        }
        exit 0;
    }


    if ($command eq "ext_save") {
        shift(@ARGV);
        $curtmpdir="$tmpdir/$handle";
        $execname=$ARGV[1];
        shift(@ARGV);

        smog_chdir("$curtmpdir");

        $com="\"$execname\" encode @ARGV";
        $smerr=smog_system($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }
        &sig_complete;
        exit 0;

    }



    if ($command eq "save") {
        my $cmd="";

        $get_rfx=0;

        if ($handle eq "get_rfx") {
            $get_rfx=1;
            shift(@ARGV);
            $handle=$ARGV[1];

            $curtmpdir="$tmpdir/$handle";
            if ($^O eq "MSWin32") {
                $statusfile="$curtmpdir/status";
                $pidfile=$curtmpdir."/pid";
            }
            else {
                $statusfile="$curtmpdir/.status";
                $pidfile=$curtmpdir."/.pid";
            }

        }

        unlink "$curtmpdir/pause";
        smog_chdir("$curtmpdir");

        $plugin=$ARGV[2];

        $fps=$ARGV[3];
        $nfile=$ARGV[4];

# check the file is writable
        unless ($nfile eq ""||&is_writeable($nfile)) {
            &sig_error("Unable to open output file !","$GUI_NAME could not write to $nfile.");
        }

        $start=$ARGV[5];
        $is_linked=0;

#create symlinks in /tmp (for dynebolic)
        $linksdir="/tmp/lives-symlinks/$handle/";

        if ($start==-1) {
# special value which tells us we are dealing with symlinks
            $start=1;
            $is_linked=1;
        }

        $end=$ARGV[6];
        $arate=$ARGV[7];
        $achans=$ARGV[8];
        $asamps=$ARGV[9];
        if (defined($ARGV[10])) {
            $ssigned=$ARGV[10]&1; #CAREFUL - this is reversed in LiVES (there unsigned==1, signed==0)
            $aendian=$ARGV[10]&2; # value of 2 means bigendian
            $aendian=!$aendian; #endian is revesed here (0 means bigend)
        }

        else {
            $ssigned=1;
            if ($asamps==8) {
                $ssigned=0;
            }
            $aendian=&get_endian;
        }

        $sox_version=&get_sox_version;

        if ($sox_version < 14004001) {
            if ($ssigned==1) {
                $asigned="-s";
            }
            else {
                $asigned="-u";
            }
        }
        else {
            if ($ssigned==1) {
                $asigned="-e signed-integer";
            }
            else {
                $asigned="-e unsigned-integer";
            }
        }

        if (defined($ARGV[11])) {
            $aud_start=$ARGV[11];
        }
        else {
            $aud_start=($start-1.)/($fps*1.);
        }
        if (defined($ARGV[12])) {
            $aud_end=$ARGV[12];
        }
        else {
            $aud_end=($end*1.)/($fps*1.);
        }

        $img_ext=&get_img_ext($curtmpdir,$start);

# get image size ($hsize x $vsize)
        $imresact="none";
        my $firstframe=&mkname($start);

        &get_image_size("$firstframe$img_ext");

        if ($panic||$hsize==-1) {
            unlink $pidfile;
            exit 1;
        }
        $otype=&rc_get("output_type");

        $encoder=&rc_get("encoder");

        $DEBUG_ENCODERS=1;

        $audiofile="";


        if ($get_rfx==0) {

            unlink "audiodump.wav";

            $areq=&get_form_request($plugin);

#prepare audio stream if requested
            if (-f "$curtmpdir/audio" && $arate>0) {

                $origaudio=$audiofile=$audio_in="$curtmpdir/audio";
                if ($areq&1||$aud_start!=0.) {

# encode sound up to the next nearest second
# seems to be the norm...
                    $aud_length=($aud_end-$aud_start);
                    $aud_length=int($aud_length+1.0);
                    $aud_end=$aud_start+$aud_length;

# clip the (raw) audio

                    $audiofile=$audio_in=&clip_audio($aud_start,$aud_end);
                    if ($panic) {
                        unlink "$pidfile";
                        exit 1;
                    }

#pad to end with silence
                    $desired_length=$aud_length*$arate*$achans*$asamps/8;
                    &append_silence(0,$desired_length,$asamps,$achans,$ssigned,$aendian,$audiofile);
                    if ($panic) {
                        unlink "$pidfile";
                        exit 1;
                    }

                    if ($aud_start!=0.&&!($areq&1)) {
                        if (&rc_get("conserve_space") eq "true") {
                            unlink "$origaudio";
                        }
                        else {
                            smog_rename( "$origaudio","$origaudio.origbak");
                        }
                        smog_rename( "$curtmpdir/$audiofile","$origaudio");
                        $audio_file=$audio_in=$origaudio;
                    }
                }
                if ($areq&2) {
# convert raw audio to wav
                    $audio_out=$curtmpdir . "/audiodump.wav";
                    &convert_audio_to_wav;
                    if ($panic) {
                        unlink "$pidfile";
                        exit 1;
                    }
                    unlink "$audio_in";
                    $audiofile=$audio_out;
                }
            }

            if ($areq&4) {

                if ($start>1) {
# move the selection down so that frames start at 1
# note, LiVES never uses this any more, 
# instead it first calls link_frames, and possibly sets $start to -1
# (see above)

                    if (-d $linksdir) {
                        smog_system("/bin/rm -rf \"$linksdir\"");
                    }

                    $com="/bin/mkdir -p \"$linksdir\"";
                    $smerr=smog_system($com);
                    if ($smerr) {
                        sig_system_error("Creating directory \"$linksdir\"",$smerr);
                        unlink "$pidfile";
                        exit 1;
                    };


                    smog_system ("/bin/chmod -R 777 \"$linksdir\"");

                    if ($^O ne "MSWin32") {
                        $fstype=&get_fs_type($curtmpdir);
                    }

# need to make hard links, as some encoders complain about symbolic links


                    for ($i=1;$i<=($end-$start+1);$i++) {
                        $name=&mkname($i);
                        $from=&mkname($i+$start-1);
                        if (-f "$curtmpdir$from$img_ext") {
                            if ($^O eq "MSWin32") {
                                $smerr=smog_system ("cp.exe \"$curtmpdir/$from$img_ext\" \"$linksdir$name$img_ext\"");
                                if ($smerr) {
                                    sig_system_error("Copying \"$curtmpdir/$from$img_ext\" to \"$linksdir$name$img_ext\"",$smerr);
                                    unlink "$pidfile";
                                    exit 1;
                                }
                            }
                            else {
                                if ($fstype eq "vfat" || $fstype eq "fat32" || $fstype eq "msdos") {
                                    $smerr=smog_system ("/bin/cp -f \"$curtmpdir/$from$img_ext\" \"$linksdir$name$img_ext\"");
                                    if ($smerr) {
                                        sig_system_error("Copying \"$curtmpdir/$from$img_ext\" from \"$linksdir$name$img_ext\"",$smerr);
                                        unlink "$pidfile";
                                        exit 1;
                                    }
                                }
                                else {
                                    $smerr=smog_system ("/bin/ln \"$curtmpdir/$from$img_ext\" \"$linksdir$name$img_ext\"");
                                    if ($smerr) {
                                        sig_system_error("Symlinking \"$curtmpdir/$from$img_ext\" from \"$linksdir$name$img_ext\"",$smerr);
                                        unlink "$pidfile";
                                        exit 1;
                                    }
                                }
                            }
                        }
                    }
                    if (-f $audiofile) {
                        my $xaudiofile=(split(/\//,$audiofile))[-1];
                        if (! -f "$linksdir$xaudiofile") {
                        if ($^O eq "MSWin32") {
                                $smerr=smog_system ("cp.exe \"$curtmpdir/$audiofile\" \"$linksdir$xaudiofile\"");
                                if ($smerr) {
                                    sig_system_error("Copying \"$curtmpdir/$audiofile\" to \"$linksdir$xaudiofile\"",$smerr);
                                    unlink "$pidfile";
                                    exit 1;
                                }
                            }
                            else {
                                if ($fstype eq "vfat" || $fstype eq "fat32" || $fstype eq "msdos") {
                                    $smerr=smog_system("/bin/cp -f \"$curtmpdir/$audiofile\" \"$linksdir$xaudiofile\"");
                                    if ($smerr) {
                                        sig_system_error("Copying \"$curtmpdir/$audiofile\" from \"$linksdir$xaudiofile\"",$smerr);
                                        unlink "$pidfile";
                                        exit 1;
                                    }
                                }
                                else {
                                    $smerr=smog_system("/bin/ln \"$curtmpdir/$audiofile\" \"$linksdir$xaudiofile\"");
                                    if ($smerr) {
                                        sig_system_error("Symlinking \"$curtmpdir/$audiofile\" from \"$linksdir$xaudiofile\"",$smerr);
                                        unlink "$pidfile";
                                        exit 1;
                                    }
                                }
                            }
                        }
                    }
                    $is_linked=1;
                }
            }

            if ($is_linked==1) {
                smog_chdir("$linksdir");
            }

        }


        unless ($plugin eq "") {
            $atype=&rc_get("encoder_acodec");
            $fields="$fps \"$nfile\" $start $end $img_ext $otype $atype $hsize $vsize";
            $fields.=" $DEBUG_ENCODERS";
            $fields.=" $arate $achans $asamps $ssigned";

            if ($plugin =~ /multi_encoder$/) {
                $extra_opts="-v";
            }

            if ($^O eq "MSWin32") {
# adjust depending on file ext
                my $ext=&get_ext("$plugin");
                if ($ext eq ".py") {
                    $cmd="python";
                }
                else {
                    $cmd="perl";
                }
                if ($get_rfx==0) {
                    $fields.=@ARGV[13..$#ARGV];
                    $com="$cmd \"$plugin\" $extra_opts encode $fields";

                }
                else {
                    $com="$cmd \"$plugin\" get_rfx $fields";
                }
            }
            else {
                if ($get_rfx==0) {
                    $fields.=@ARGV[13..$#ARGV];
                    $com="\"$plugin\" $extra_opts encode $fields";
                }
                else {
                    $com="\"$plugin\" get_rfx $fields";
                }
            }

            $smerr=smog_system("$com");

            &sig_complete;
            exit 0;
        }

        if (-f ".comment") {
            open IN,"< .comment";
            read IN,$string,1040;
            close IN;
            unlink ".comment";
        }
        @tmp=split(/\|\|\%/,$string);

        $title=$tmp[0];
        $author=$tmp[1];
        $comment=$tmp[2];
        chomp($comment);

        if ($get_rfx==0) {
            $command="encode";
        }
        else {
            $command="get_rfx";
        }

        return 1;
    exit 0; # just in case
        }


    if ($command eq "link_frames") {
        unlink "$curtmpdir/pause";
        smog_chdir("$curtmpdir");

        $start=$ARGV[2];
        $end=$ARGV[3];

        $astart=$ARGV[4];
        $aend=$ARGV[5];

        $arate=$ARGV[6];
        $achans=$ARGV[7];
        $asamps=$ARGV[8];
        $asigned=$ARGV[9];
        $aendian=$ARGV[10];

        $from_handle=$ARGV[11];

        my $i;
        my $audiofile="audio";

        if ($from_handle eq "") {
#create symlinks in /tmp for dynebolic
            $linksdir="/tmp/lives-symlinks/$handle/";

            if (-d $linksdir) {
                if ($^O eq "MSWin32") {
                    smog_system("DEL /q \"$linksdir\"");
                    smog_system("RMDIR \"$linksdir\"");
                }
                else {
                    smog_system("/bin/rm -rf \"$linksdir\"");
                }
            }

            if ($^O eq "MSWin32") {
                $com="mkdir.exe -p \"$linksdir\"";
            }
            else {
                $com="/bin/mkdir /p \"$linksdir\"";
            }
            $smerr=smog_system($com);
            if ($smerr) {
                sig_system_error("Creating directory \"$linksdir\"",$smerr);
                unlink "$pidfile";
                exit 1;
            }

            if ($^O eq "MSWin32") {
                smog_system ("chmod.exe -R 777 \"$linksdir\"");
            }
            else {
                smog_system ("/bin/chmod -R 777 \"$linksdir\"");
            }
        }
        else {
            $linksdir=$curtmpdir;
            $handle=$from_handle;
            $curtmpdir="$tmpdir/$handle/";
        }


# copy a slice of the audio file into our links dir
# this allows us to resample it
# and also aligns the start of audio with new frame 1

        unless ($aend==0.) {

            my $ocurtmpdir=$curtmpdir;
            my $ofrom_handle=$from_handle;
            my $ostart=$start;
            my $oend=$end;

            $start=$astart;
            $end=$aend;
            $where=0.;
            $from_handle=$handle;
            $curtmpdir=$linksdir;

            &insert_audio($asamps,$achans,$asigned,$aendian,0);
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }

            $curtmpdir=$ocurtmpdir;
            $from_handle=$ofrom_handle;
            $start=$ostart;
            $end=$oend;

        }

        $img_ext=&get_img_ext($curtmpdir,$start);

        if ($^O ne "MSWin32") {
            $fstype=&get_fs_type($curtmpdir);
        }

        for ($i=1;$i<=($end-$start+1);$i++) {
            $name=&mkname($i);
            $from=&mkname($i+$start-1);
            if (-f "$curtmpdir/$from$img_ext") {
                if ($^O eq "MSWin32") {
                    $smerr=smog_system ("cp.exe \"$curtmpdir/$from$img_ext\" \"$linksdir/$name$img_ext\"");
                    if ($smerr) {
                        sig_system_error("Copying \"$curtmpdir/$from$img_ext\" to \"$linksdir/$name$img_ext\"",$smerr);
                        unlink "$pidfile";
                        exit 1;
                    }
                }
                else {
                    if ($fstype eq "vfat" || $fstype eq "fat32" || $fstype eq "msdos") {
                        $smerr=smog_system ("/bin/cp -f \"$curtmpdir/$from$img_ext\" \"$linksdir/$name$img_ext\"");
                        if ($smerr) {
                            sig_system_error("Copying \"$curtmpdir/$from$img_ext\" to \"$linksdir/$name$img_ext\"",$smerr);
                            unlink "$pidfile";
                            exit 1;
                        }
                    }
                    else {
                        $smerr=smog_system ("/bin/ln \"$curtmpdir/$from$img_ext\" \"$linksdir/$name$img_ext\"");
                        if ($smerr) {
                            sig_system_error("Linking \"$curtmpdir/$from$img_ext\" to \"$linksdir/$name$img_ext\"",$smerr);
                            unlink "$pidfile";
                            exit 1;
                        }
                    }
                }

            }
            &sig_progress($i);
        }

        unless ($from_handle eq "") {
            $curtmpdir=$linksdir;
        }

        &sig_complete;
        exit 0;
    }


    if ($command eq "resize_all") {
        unlink "$curtmpdir/pause";
        smog_chdir("$curtmpdir");
        $end=$ARGV[2];

        my $iwidth=$ARGV[3];
        my $iheight=$ARGV[4];

        $img_ext=".".$ARGV[5];
        $img_prefix=&get_img_prefix($img_ext);

        $resize_ext=".mgk";

        $blankname="blank.jpg";

        my $letterbox=0;

        if (defined($ARGV[6]) && $ARGV[6]>0) {
# letterboxen - next values are image-in-frame size
            $letterbox=1;
            $owidth=$iwidth;
            $oheight=$iheight;
            $iwidth=$ARGV[6];
            $iheight=$ARGV[7];
            $in_ext=$resize_ext;
            $out_ext=$img_ext;
        }

        &clean_old;

        if ($letterbox) {
# make a background frame
            if (!defined($bgcolour)) {
                $bgcolour="#000000";
            }

            $com="$smog_convert_command -size $owidth"."x$oheight\\! xc:$bgcolour $blankname >$nulfile 2>&1";
            $smerr=smog_system($com);
            if ($smerr) {
                sig_system_error("$com",$smerr);
                unlink $blankname;
                unlink "$pidfile";
                exit 1;
            }
        }



        for ($i=1;$i<=$end;$i++) {
            $name=&mkname($i);

            smog_copy("$name$img_ext","$name.bak");
            if ($panic) {
                if ($letterbox) {
                    try_to_recover($start,$i-1);
                    unlink $blankname;
                }
                if ($DEBUG_SMOGRIFY) {
                    print STDERR "smogrify debug - rename failed ($!): \"$curtmpdir/$name$img_ext\",\"$curtmpdir/$name.bak\"\n";
                }
                sig_system_error("Renaming \"$curtmpdir/$name$img_ext\" to \"$curtmpdir/$name.bak\"");

                unlink "$pidfile";
                exit 1;
            }


            if ($iwidth>0 && $iheight>0) {
                &resize_frame($name,$iwidth,$iheight);
            }

            if ($panic) {
                if ($letterbox) {
                    try_to_recover($start,$i);
                    unlink $blankname;
                }
                unlink "$pidfile";
                exit 1;
            }

            if ($letterbox) {
                &letterbox_frame($name,abs($iwidth),abs($iheight),$owidth,$oheight);
            }

            if ($panic) {
                if ($letterbox) {
                    try_to_recover($start,$i);
                    unlink $blankname;
                }
                unlink "$pidfile";
                exit 1;
            }

            &sig_progress($i);
        }


        $start=1;

        unless ($letterbox) {
            &mv_mgk;
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }
        }
        else {
            unlink $blankname;
        }

        &sig_complete;
        exit 0;
    }

    if ($command eq "backup") {
        $withaudio=$ARGV[2];
        $start=$ARGV[3];
        $end=$ARGV[4];

        if ($withaudio==0) {
            $audio="";
        }
        else {
            $audio="audio";
        }

        $nfile=$ARGV[5];

        unlink "$curtmpdir/pause";
        smog_chdir("$curtmpdir");

# check the file is writable
        unless (&is_writeable($nfile)) {
            &sig_error("Unable to open output file !","$GUI_NAME could not write to $nfile.");
        }

        unlink glob "*.tar";
        $com="tar --ignore-failed-read -cf header.tar \"$audio\" header* extended* event.* subs.* file* 2>$nulfile";
        smog_system ($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }

        &sig_progress(0);

        $com="tar -cf temp.tar header.tar 2>.tar_err";
        $smerr=smog_system ($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }

        $com="tar --exclude=*.bak --exclude=*.tar --exclude=./.* --exclude=*.mgk --exclude=*.tmp --exclude=audioclip* -rf temp.tar * 2>>.tar_err";
        $smerr=smog_system ($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }

        if ($^O eq "MSWin32") {
            $com="gzip.exe -S .lv1 temp.tar";
        }
        else {
            $com="gzip -S .lv1 temp.tar";
        }

        $smerr=smog_system ($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }

        unlink "temp.tar";

        smog_rename("temp.tar.lv1","$nfile");

        unlink <header.tar 0*.tar>;
        if (-f ".tar_err") {
            open IN,"< .tar_err";
            read IN,$tarerr,255;
            close IN;
            unless ($tarerr eq "") {
                &sig_error("Error creating new backup.",$tarerr);
                unlink glob "*.tar .tar_err";
                unlink "$pidfile";
                exit 1;
            }
        }
        $size=-s "$nfile";
        &sig_complete($size);
        exit 0;
    }


    if ($command eq "restore") {
        $nfile=$ARGV[2];

        smog_chdir("$curtmpdir");

        if ($^O ne "MSWin32") {
            $com="tar -zxf \"$nfile\" 2>$nulfile";
            smog_system ($com);

            if ($smerr) {
                sig_system_error("$com",$smerr);
                unlink "$pidfile";
                exit 1;
            }
        }
        else {
            smog_copy("$nfile","$curtmpdir\\temp.gz");
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }
            $com="gzip.exe -d temp.gz";
            smog_system ($com);
            if ($smerr) {
                sig_system_error("$com",$smerr);
                unlink "$pidfile";
                exit 1;
            }
            $com="tar.exe -xf temp";
            smog_system ($com);
            if ($smerr) {
                sig_system_error("$com",$smerr);
                unlink "$pidfile";
                exit 1;
            }
            unlink "temp";
        }

        unless (-f "header.tar"||-f "header"||-f "header.lives") {
            &sig_error("This does not appear to be a valid backup file","$GUI_NAME was unable to open it.");
        }

        opendir DIR,$curtmpdir;
        while ($file=readdir(DIR)) {
            if ($file =~ /.tar$/) {
                smog_system("tar -xf $file 2>$nulfile");
                unlink "$file";
            }
        }
        close DIR;

        &sig_complete;
        exit 0;
    }



    if ($command eq "reorder") {
        unlink "$curtmpdir/pause";

        $img_ext=".".$ARGV[2];
        $img_prefix=&get_img_prefix($img_ext);

        if (!defined($ARGV[3])) {
            $endian=&get_endian;
        }
        else {
            $endian=$ARGV[3];
        }
        if (defined $ARGV[4]) {
            $newwidth=$ARGV[4];
        }
        if (defined $ARGV[5]) {
            $newheight=$ARGV[5];
        }
        if (defined $ARGV[6]) {
            if ($ARGV[6]==1) {
                $leave_bak=1;
            }
        }
        if (defined $ARGV[7]) {
            $old_end=$ARGV[7];
        }

        $letterbox=0;

        if (defined $ARGV[8] && $ARGV[8]!=0) {
#letterbox size
            $letterbox=1;
            $owidth=$newwidth;
            $oheight=$newheight;

            $newwidth=$ARGV[8];
            $newheight=$ARGV[9];
            $in_ext=".mgk";
            $out_ext=$img_ext;
        }

        $newframe=-1;
        $event_file="$curtmpdir/event.frames";
        $resize_ext=".tmp";
        smog_chdir("$curtmpdir");

        unless ($leave_bak==1) {
            &clean_old;
        }

        $blankname="blank.jpg";

        if (defined(open IN,"< $event_file")) {
            $fcount=1;
            read IN,$val,4;
            $pstart=&getint($val);
            $count=$pstart;


            if ($letterbox&&!$leave_bak) {
# make a background frame
                if (!defined($bgcolour)) {
                    $bgcolour="#000000";
                }

                $com="$smog_convert_command -size $owidth"."x$oheight\\! xc:$bgcolour $blankname>$nulfile 2>&1";
                $smerr=smog_system($com);
                if ($smerr) {
                    sig_system_error("$com",$smerr);
                    unlink "$pidfile";
                    exit 1;
                }
            }

            while ($newframe!=0) {
                read IN,$val,4;
                $newframe=&getint($val);
                if ($newframe>0) {
                    $from=&mkname($newframe);
                    if (-f "$curtmpdir/$from$img_ext") {
                        $to=&mkname($count);

                        if ($newwidth > 0 && $newheight > 0) {
                            &resize_frame($from,$newwidth,$newheight);
                            if ($panic) {
                                if ($letterbox) {
                                    try_to_recover($start,$i-1);
                                    unlink $blankname;
                                }
                                unlink "$pidfile";
                                exit 1;
                            }

                            $smerr=rename "$curtmpdir/$from$resize_ext","$curtmpdir/$to.mgk";
                            if (!$smerr) {
                                if ($letterbox) {
                                    try_to_recover($start,$i);
                                    unlink $blankname;
                                }
                                sig_system_error("Renaming \"$curtmpdir/$from$resize_ext\" to \"$curtmpdir/$to.mgk\"",$!);
                                unlink "$pidfile";
                                exit 1;
                            }
                        }
                        else {
                            unless (($from eq $to) || $letterbox) {
                                smog_copy("$curtmpdir/$from$img_ext", "$curtmpdir/$to.mgk");
                                if ($panic) {
                                    unlink "$pidfile";
                                    exit 1;
                                }
                            }
                        }

#now resized are in .mgk
                        if ($letterbox) {
                            if ($leave_bak) {
#letterboxing was done with resize
                                unless ($from eq $to) {
                                    smog_copy("$curtmpdir/$from$img_ext", "$curtmpdir/$to$img_ext.2");
                                    if ($panic) {
                                        try_to_recover($start,$i);
                                        unlink "$pidfile";
                                        exit 1;
                                    }
                                    smog_copy("$curtmpdir/$from.mgk", "$curtmpdir/$to.mgk.2");
                                    if ($panic) {
                                        try_to_recover($start,$i);
                                        unlink "$pidfile";
                                        exit 1;
                                    }
                                }
                            }
                            else {
                                smog_copy("$curtmpdir/$to$img_ext", "$curtmpdir/$to.bak");
                                if ($panic) {
                                    try_to_recover($start,$i-1);
                                    unlink "$pidfile";
                                    unlink $blankname;
                                    exit 1;
                                }
# make $to.mgk $to.img_ext
                                &letterbox_frame($to,abs($newwidth),abs($newheight),$owidth,$oheight);

                                if ($panic) {
                                    try_to_recover($start,$i-1);
                                    unlink "$pidfile";
                                    unlink $blankname;
                                    exit 1;
                                }

#lb are in .img
                            }

                        }

                    }
                    $count++;
                }
                &sig_progress($fcount++);
            }
            close IN;

            if ($letterbox&&!$leave_bak) {
                unlink $blankname;
            }

        }

        else {
            &sig_error;
        }

        $start=$pstart;
        $new_count=--$count;
        $end=$count;

        unless ($letterbox) {
# mv mgk -> $img_ext
            &mv_mgk;
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }
        }

        if ($letterbox&&$leave_bak) {

# because of potential ovewrite we made .mgk2 (resized/no letterbox) and $img_ext.2 (resized)
# now copy these
            unless (!defined($pidfile)||$pidfile eq "") {
# don't want to get killed in this stage...
                unlink "$pidfile";
            }
            if ($smerr) {
                sig_system_error("$com",$smerr);
                unlink "$pidfile";
                exit 1;
            }
            for ($i=$start; $i<=$end; $i++) {
                $name=&mkname($i);
                if (-f "$curtmpdir/$name.mgk.2") {
                    if (-f "$curtmpdir/$name$img_ext.2") {
                        unlink "$curtmpdir/$name$img_ext";
                        $smerr=rename "$curtmpdir/$name$img_ext.2","$curtmpdir/$name$img_ext";
                        if (!$smerr) {
                            if ($letterbox) {
                                try_to_recover($start,$end);
                            }
                            sig_system_error("Renaming \"$curtmpdir/$name$img_ext.2\" to \"$curtmpdir/$name$img_ext\"",$!);
                            unlink "$pidfile";
                            exit 1;
                        }

                    }
                    unlink "$curtmpdir/$name.mgk";
                    $smerr=rename "$curtmpdir/$name.mgk.2","$curtmpdir/$name.mgk";

                    if (!$smerr) {
                        if ($letterbox) {
                            try_to_recover($start,$end);
                        }
                        sig_system_error("Renaming \"$curtmpdir/$name.mgk.2\" to \"$curtmpdir/$name.mgk\"",$!);
                        unlink "$pidfile";
                        exit 1;
                    }
                }
            }
        }

        if ($end<$old_end) {
# remove excess frames
            for ($i=$end+1; $i<=$old_end; $i++) {
                $name=&mkname($i);
                if (-f "$curtmpdir/$name$img_ext") {
                    unlink "$curtmpdir/$name.bak";
                    smog_rename("$curtmpdir/$name$img_ext","$curtmpdir/$name.bak");
                }
            }
            &sig_progress($i);
        }

        &sig_complete($new_count);
        exit 0;
    }



    if ($command eq "deorder") {
        $start=$ARGV[2];
        $end=$ARGV[3];
        $frames=$ARGV[4];
        $img_ext=".".$ARGV[5];
        if (defined $ARGV[6]) {
            $leave_bak=$ARGV[6];
        } else {
            $leave_bak=0;
        }

        smog_chdir("$curtmpdir");

        $oend=$end;

        if ($end>$frames) {
            $end=$frames;
        }

        &undo(!$leave_bak);
# will abort on failure

        if ($frames<$oend) {
# frames were upsampled
            for ($i=$frames+1; $i<=$oend; $i++) {
                $name=&mkname($i);
                if (!$leave_bak) {
                    unlink "$curtmpdir/$name$img_ext";
                } else {
                    smog_rename("$curtmpdir/$name$img_ext","$curtmpdir/$name.mgk");
                }
            }
        } else {
# frames were downsampled
            for ($i=$end+1; $i<=$frames; $i++) {
                $name=&mkname($i);
                if (!$leave_bak) {
                    if (-f  "$curtmpdir/$name.bak") {
                        smog_rename("$curtmpdir/$name.bak","$curtmpdir/$name$img_ext");
                    }
                } else {
                    smog_rename("$curtmpdir/$name$img_ext","$curtmpdir/$name.mgk");
                }
            }
        }

        if (!$leave_bak) {
#remove .mgk files from undo
            &clean_old;
        }

        &sig_complete;
        exit 0;
    }


    if ($command eq "cut") {
        unlink "$curtmpdir/pause";
        &clean_old;

        $start=$ARGV[2];
        $end=$ARGV[3];
        $cut_audio=$ARGV[4];
        $frames=$ARGV[5];
        $img_ext=".".$ARGV[6];
        &cut($start,$end);

        if ($cut_audio) {
            $fps=$ARGV[7];
            $arate=$ARGV[8];
            $achans=$ARGV[9];
            $asamps=$ARGV[10];
            if ($arate*$asamps*$achans) {
                $start=($start-1)/$fps;
                $end=$end/$fps;
                &cut_audio;
                if ($panic) {
                    unlink "$pidfile";
                    exit 1;
                }
            }
        }
        &sig_complete;
        exit 0;
    }


    if ($command eq "delete_all") {
        $frames=$ARGV[2];
        if (! -d $curtmpdir) {
            &sig_complete;
            exit 1;
        }
        smog_chdir("$curtmpdir");
        unlink glob "* *.* .*";
        if ($GUI_NAME eq "LiVES") {
# LiVES needs this to stop the progress dialog from flickering
            sleep(1);
        }
        &sig_complete;
        exit 0;
    }



    if ($command eq "reverse") {
        unlink "$curtmpdir/pause";
        $start=$ARGV[2];
        $end=$ARGV[3];
        $img_ext=".".$ARGV[4];
        &reverse;
        &sig_complete;
        exit 0;
    }


    if ($command eq "undo") {
        unlink "$curtmpdir/pause";

        $start=$ARGV[2];
        $end=$ARGV[3];
        $img_ext=".".$ARGV[4];
        &undo;
# will abort on failure
        &sig_complete;
        exit 0;
    }


    if ($command eq "redo") {
        unlink "$curtmpdir/pause";

        $start=$ARGV[2];
        $end=$ARGV[3];
        $img_ext=".".$ARGV[4];

        &mv_mgk(1);
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }
        &sig_complete;
        exit 0;
    }


    if ($command eq "fs_preview") {
        $win=$ARGV[2];
        $hsize=$ARGV[3];
        $vsize=$ARGV[4];
        $start_time=$ARGV[5];
        $preview_frames=$ARGV[6];
        $file=$ARGV[7];
        $extra_params=$ARGV[8];
        $mplayer_command=&get_mplayer_location;

        if ($^O ne "MSWin32") {
            smog_system("\"$mplayer_command\" -quiet -x $hsize -y $vsize -wid $win -vo x11 -zoom -ss $start_time -frames $preview_frames \"$file\" $extra_params >$nulfile 2>&1 <$nulfile");
        } else {
            smog_system("\"$mplayer_command\" -quiet -x $hsize -y $vsize -wid $win -vo direct3d -zoom -ss $start_time -frames $preview_frames \"$file\" $extra_params >$nulfile 2>&1 <$nulfile");
        }
        &sig_complete;
        exit 0;
    }

    if ($command eq "mv_mgk") {
        unlink "$curtmpdir/pause";
        $start=$ARGV[2];
        $end=$ARGV[3];
        $img_ext=".".$ARGV[4];
        if (defined($ARGV[5])) {
            $leave_bak=$ARGV[5];
        }

        &mv_mgk;
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }
        &sig_complete;
        exit 0;
    }



    if ($command eq "export_audio") {
        $audio_start=$ARGV[2];
        $audio_end=$ARGV[3];
        $arate=$ARGV[4];
        $achans=$ARGV[5];
        $asamps=$ARGV[6];
        $asigned=$ARGV[7];
        $nrate=$ARGV[8];
        $nfile=$ARGV[9];

# check the file is writable
        unless(&is_writeable($nfile)) {
            &sig_error("Unable to open output file !","$GUI_NAME could not write to $nfile.");
        }

        $sox_version=&get_sox_version;

        if ($sox_version < 14004001) {
            if ($asigned==1) {
                $asigned="-s";
            } else {
                $asigned="-u";
            }
        } else {
            if ($asigned==1) {
                $asigned="-e signed-integer";
            } else {
                $asigned="-e unsigned-integer";
            }
        }

        if ($audio_end>0.) {
            $audio_in=&clip_audio($audio_start,$audio_end);
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }
        } else {
            $audio_in="$curtmpdir/audio";
        }

# convert raw audio to wav
        $audio_out=$curtmpdir . "/audiodump.wav";

        &convert_audio_to_wav;
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }
        if ($audio_end>0.) {
            unlink "$audio_in";
        }

        smog_rename("$audio_out","$nfile");
        if ($^O eq "MSWin32") {
            smog_system("chmod.exe 644 \"$nfile\" >$nulfile 2>&1");
        } else {
            smog_system("/bin/chmod 644 \"$nfile\" >$nulfile 2>&1");
        }

        &sig_complete;
        exit 0;
    }


    if ($command eq "recover_audio") {
        $audio_in="audiodump.pcm";


        $audio_out="audio";
        &convert_audio_to_raw;
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }
        unlink "$audio_in";


    }




    if ($command eq "append_audio") {
# here we end up with (raw) 'audiodump', which will be renamed to 'audio' in commit_audio
        $endian=&get_endian;

        $type=$ARGV[2];
        $nrate=$ARGV[3];
        $nchans=$ARGV[4];
        $nsamps=$ARGV[5];
        $nsigned=$ARGV[6];
        $nendian=$ARGV[7];
        $file=$ARGV[8];
        $audio_in="audiodump.wav";

        smog_chdir("$curtmpdir");

        $audiofile="audio";

        if ($type eq "mp3") {
            &mp3_open;
        }
        elsif($type eq "ogg") {
            &ogg_open;
        }
        elsif($type eq "wav") {
            &wav_open;
        }
        else {
            &othera_open;
        }

        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }

        smog_system_sync();

        unless(-f $audio_in) {
            &sig_error("$GUI_NAME was not able to open the file","$file");
        }

        $audio_out="audio.new";
        &convert_audio_to_raw;
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }
        unlink "$audio_in";

        $audio_bak="audio.bak";


# resample $audio_out (if required)
        unless($arate==$nrate&&$achans==$nchans&&$asamps==$nsamps&&$nsigned==$signed&&$nendian==$endian) {
            $audio_in=$audio_out;
#audio.new
            $audio_out=$audio_bak;
#audio.bak
            &resample_audio;
# audio.new -> audio.bak
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }

            unlink "$audio_in";
#audio.new
            smog_rename("$audio_out","$audio_in");
#audio.bak -> audio.new
            $audio_out=$audio_in;
#audio.new
        }

        unless(&rc_get("conserve_space") eq "true") {
            smog_rename("$audio_out","keep_$audio_out");
            &backup_audio;
            if ($panic) {
                unlink "keep_$audio_out";
                unlink "$pidfile";
                exit 1;
            }
            smog_rename("keep_$audio_out","$audio_out");
        }

# cat audio audio.new -> audiodump
        if ($^O eq "MSWin32") {
            $smerr=smog_system("cat.exe \"$curtmpdir/audio\" \"$audio_out\" > \"$curtmpdir/audiodump\"");
        } else {
            $smerr=smog_system("/bin/cat \"$curtmpdir/audio\" \"$audio_out\" > \"$curtmpdir/audiodump\"");
        }

        if ($smerr) {
            sig_system_error("Creating \"$curtmpdir\audiodump\"",$smerr);
            unlink "$pidfile";
            exit 1;
        }

        unlink "$audio_out";
#audio.new
        $fsize=-s "$curtmpdir/audiodump";
        &sig_complete($fsize);
        exit 0;
    }



    if ($command eq "trim_audio") {
        $audio_start=$ARGV[2];
        $audio_end=$ARGV[3];

        $arate=$ARGV[4];
        $achans=$ARGV[5];
        $asamps=$ARGV[6];
        $asigned=$ARGV[7];
        $aendian=$ARGV[8];

        smog_chdir("$curtmpdir");

        unless(&rc_get("conserve_space") eq "true") {
            &backup_audio;
#audio -> audio.bak
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }
        }

#trim audio to selection

# $audio_from is the new clip ("audioclip")
        $audio_from=&clip_audio($audio_start,$audio_end);
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }

        $align=$achans*$asamps/8;
        $acsize=-s $audio_from;
        $acsize/=$align*$arate;

        unlink "$audio_in";
# audio_in is "audio"

        $where=$audio_start;
        $end=$audio_end-$audio_start;
        $start=0;

        if ($end>$acsize) {
#the part we cliṕped may have been *shorter* than the selection
# need to check for this now, as we are more careful with reads and writes
            $end=$acsize;
        }

# insert_audio will insert silence at start, and should recreate "audio" from "audioclip" ($audio_from)

        &insert_audio($asamps,$achans,$asigned,$aendian,1);
        if ($panic) {
            unlink "$pidfile";
            exit 1;
            $panic=0;
        }

#append silence to pad to end

        &append_silence(0,&align($audio_end*$arate*$align),$asamps,$achans,$asigned,$aendian);
        if ($panic) {
            unlink "$pidfile";
            exit 1;
            $panic=0;
        }

        &sig_complete;
        exit 0;
    }


    if ($command eq "delete_audio") {
        $start=$ARGV[2];
        $end=$ARGV[3];
        $arate=$ARGV[4];
        $achans=$ARGV[5];
        $asamps=$ARGV[6];

        &cut_audio;
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }

        &sig_complete;
        exit 0;
    }

    if ($command eq "resample_audio") {
        $arate=$ARGV[2];
        $achans=$ARGV[3];
        $asamps=$ARGV[4];
        $asigned=$ARGV[5];
        $aendian=$ARGV[6];


        $nrate=$ARGV[7];
        $nchans=$ARGV[8];
        $nsamps=$ARGV[9];
        $nsigned=$ARGV[10];
        $nendian=$ARGV[11];
        $audio_in="$curtmpdir/audio.bak";
        $audio_out="$curtmpdir/audio";

        if (defined($ARGV[12])) {
            $stretch=$ARGV[12];
            $audio_in="$curtmpdir/audio.orig";
        }

        unlink "$audio_in";
        smog_rename("$audio_out","$audio_in");
# aborts on failuer

        smog_system_sync();

        &resample_audio;
        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }

        if (&rc_get("conserve_space") eq "true" && (-s $audio_out)) {
            unlink "$audio_in";
        }

        &sig_complete;
        exit 0;
    }



    if ($command eq "get_window_id") {
        smog_system("xwininfo > \"$curtmpdir/tmpinfo\"");

        smog_system("grep \"Window id:\" \"$curtmpdir/tmpinfo\" > \"$curtmpdir/tmpinfo2\"");
        if (defined(open IN,"< $curtmpdir/tmpinfo2")) {
            read IN,$win_id,128;
            close IN;
        }
        @wid=split(/ /,$win_id);
        $win_id=hex($wid[3]);
        chomp($win_id);

        smog_system("grep \"Width:\" \"$curtmpdir/tmpinfo\" > \"$curtmpdir/tmpinfo2\"");
        if (defined(open IN,"< $curtmpdir/tmpinfo2")) {
            read IN,$width,128;
            close IN;
        }
        @widths=split(/Width: /,$width);
        $width=$widths[1];
        chomp($width);

        smog_system("grep \"Height:\" \"$curtmpdir/tmpinfo\" > \"$curtmpdir/tmpinfo2\"");
        if (defined(open IN,"< $curtmpdir/tmpinfo2")) {
            read IN,$height,128;
            close IN;
        }
        @heights=split(/Height: /,$height);
        $height=$heights[1];
        chomp($height);

        smog_system("grep \"Depth:\" \"$curtmpdir/tmpinfo\" > \"$curtmpdir/tmpinfo2\"");
        if (defined(open IN,"< $curtmpdir/tmpinfo2")) {
            read IN,$bpp,128;
            close IN;
        }
        @bpps=split(/Depth: /,$bpp);
        $bpp=$bpps[1];
        chomp($bpp);


        smog_system("grep \"Visual:\" \"$curtmpdir/tmpinfo\" > \"$curtmpdir/tmpinfo2\"");
        if (defined(open IN,"< $curtmpdir/tmpinfo2")) {
            read IN,$visual,128;
            close IN;
        }
        @visuals=split(/Visual: /,$visual);
        $visual=$visuals[1];
        chomp($visual);

        unlink "$curtmpdir/tmpinfo";
        unlink "$curtmpdir/tmpinfo2";

        &sig_complete($win_id,$width,$height,$bpp,$visual);
        exit 0;
    }


    if ($command eq "fill_and_redo_frames") {
# remove any gaps in the play images
        unlink "$curtmpdir/pause";
        $end=$ARGV[2];
        $width=$ARGV[3];
        $height=$ARGV[4];
        $img_ext=".".$ARGV[5];
        $img_prefix=&get_img_prefix($img_ext);
        $has_audio=0;
        $fps=$ARGV[6];
        $arate=$ARGV[7];
        $achans=$ARGV[8];
        $asamps=$ARGV[9];
        $asigned=$ARGV[10];
        $aendian=$ARGV[11];

        if ($achans>0) {
            $has_audio=1;
        }

        &fill_and_redo_frames;

        if ($panic) {
            unlink $pidfile;
            exit 1;
        }

        if ($has_audio) {
            $aud_end=($end/$fps)*$achans*$arate*($asamps/8);
            $audio_in="$curtmpdir/audio";
            $audsize=-s $audio_in;
            if ($audsize > $aud_end) {
                $audio_out=&clip_audio(0.,$end/$fps);
                if ($panic) {
                    unlink "$pidfile";
                    exit 1;
                }
                unlink "$audio_in";
                smog_rename("$audio_out","$audio_in");
            }
            elsif($audsize<$aud_end) {
                $audio_out="$curtmpdir/audio.bak";
                smog_rename("$audio_in","$audio_out");
                &append_silence(0,$aud_end-$audsize,$asamps,$achans,$asigned,$aendian,$audio_in);
                if ($panic) {
                    unlink "$pidfile";
                    exit 1;
                }
                if ($^O eq "MSWin32") {
                    smog_system("cat.exe \"$audio_out\">>\"$audio_in\"");
                } else {
                    smog_system("/bin/cat \"$audio_out\">>\"$audio_in\"");
                }
                unlink "$audio_out";
            }
        }

        &sig_complete;
        exit 0;
    }


    if ($command eq "commit_audio") {
# commit the audio file in either audiodump or audiodump.wav as new audio file

        $allow_nonex=0;
        if (defined $ARGV[2]) {
            $allow_nonex=$ARGV[2];
        }

        smog_chdir("$curtmpdir");
        $audio_out="audio";
        $audio_bak="audio.bak";

        my $gotit=0;

        $file=$audio_in="audiodump.wav";

        my $f_size=-s $audio_in;
        if ($f_size>0) {
# wav format
            unless(&rc_get("conserve_space") eq "true") {
                if (-f $audio_out) {
                    $smres=smog_rename("$audio_out","$audio_bak");
                } else {
                    if ($^O eq "MSWin32") {
                        $smres=smog_system("touch.exe \"$audio_bak\"");
                    } else {
                        $smres=smog_system("touch \"$audio_bak\"");
                    }
                    if ($smres) {
                        sig_write_error("$audio_bak");
                        unlink "$pidfile";
                        exit 1;
                    }
                }
            }
            $is_audio=TRUE;
            &get_file_info;
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }
            &convert_audio_to_raw;
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }
        } else {
            $audio_in="audiodump";
            if (! -f $audio_in) {
                $audio_in="audiodump.pcm";
            } else {
                $gotit=1;
            }
            if ($gotit || -f $audio_in) {
# raw format
                unless(&rc_get("conserve_space") eq "true") {
                    if (-f $audio_out) {
                        $smres=smog_rename("$audio_out","$audio_bak");
#aborts on failure
                    } else {
                        if ($^O eq "MSWin32") {
                            $smres=smog_system("touch.exe \"$audio_bak\"");
                        } else {
                            $smres=smog_system("touch \"$audio_bak\"");
                        }
                        if ($smres) {
                            sig_write_error("$audio_bak");
                            unlink "$pidfile";
                            exit 1;
                        }
                    }
                }
                smog_rename("$audio_in","$audio_out");
# dummy values, the GUI should know these
                $arate=$achans=$asamps=0;
                $signed=$endian=1;
            } else {
                unless($allow_nonex) {
                    &sig_error("$GUI_NAME audio error.");
                }
            }
        }
        unlink glob "audiodump.*";

        $f_size=-s $audio_out;
        &sig_complete($arate,$achans,$asamps,$signed,$endian,$f_size);
        exit 0;
    }

    if ($command eq "cancel_audio") {
# remove the audio file in audiodump/audiodump.wav
# plus any audio.new files (e.g. from append audio)

        smog_chdir("$curtmpdir");
        unlink glob "audiodump* audio.new";

        &sig_complete;
        exit 0;
    }


    if ($command eq "download_clip") {
        my $url=$ARGV[2];
        my $dfile=$ARGV[3];

        if ($url =~ /youtube/ || $url =~ /youtu\.be/) {
# youtube-dl

            if (-f $dfile) {
                unlink "$dfile";
            }

            if (-f $dfile) {
                &sig_error;
                exit 2;
            }

            $com="youtube-dl -o \"$dfile\" -f 43 -q --no-part \"$url\"";

            &sig_progress(1);

            $res=smog_system("$com");

            if ($res || !(-f $dfile) || -z $dfile) {

                if (-f $dfile) {
                    unlink "$dfile";
                }

                sig_system_error("$com",$res);
                unlink "$pidfile";
                exit 1;
            }
        }

        &sig_complete;
        exit 0;
    }



    if ($command eq "cdopen") {

        $cdda2wav_command=&location("cdda2wav");
        if ($cdda2wav_command eq "") {
            $cdda2wav_command=&location("icedax");
            if ($cdda2wav_command eq "") {
                &sig_error("cdda2wav or icedax is required for this function.","Please install it first.");
            }
        }

        $cdplay_device=&rc_get("cdplay_device");
        if ($cdplay_device eq "") {
            &sig_error("You must set the CD device first in Preferences.");
        }

        $track=$ARGV[2];

        $audiofile=$curtmpdir."/audiodump.wav";
        if (-f $audiofile) {
            unlink "$audiofile";
        }

        $com="\"$cdda2wav_command\" -q -x -D \"$cdplay_device\" -t $track \"$audiofile\"| >$nulfile 2>&1";
        $smerr=smog_system($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }
        $f_size=-s $audiofile;
# the '-x' option will force these
        $arate=44100;
        $achans=2;
        $asamps=16;
        $aendian=&get_endian;
        $asigned=1;
        if ($asamps==8) {
            $asigned=0;
        }
        &sig_complete($arate,$achans,$asamps,$asigned,$aendian,$f_size);
        exit 0;
    }


    if ($command eq "audioopen") {
# TODO - allow front end to specify rate/channels, etc.

        $file=$ARGV[2];

        smog_chdir("$curtmpdir");

        $audio_in="audiodump.wav";

        $ext=&get_ext("$file");
        if ($ext eq ".mp3") {
            &mp3_open;
        }
        elsif($ext eq ".ogg") {
            &ogg_open;
        }
        elsif($ext eq ".wav") {
            &wav_open;
        }
        else {
            &othera_open;
        }


        if ($panic) {
            unlink "$pidfile";
            exit 1;
        }

        &sig_complete($arate,$achans,$asamps,$asigned,$aendian,$f_size);
        exit 0;
    }

    if ($command eq "insert") {
# with_audio: 0, no audio, 1 video and audio, 2 ONLY audio
# for 0 and 1, start, end, where are in frames; for 2, start,end,where are in seconds
# with -ve arate means insert silence [with_audio should be 1 or 2]
# with -ve times means undo cut/delete [source is same clip dir]

# with -ve end means "allow missing frames" (used for copying to clipboard)

        unlink "$curtmpdir/pause";
        $img_ext=".".$ARGV[2];
        $img_prefix=&get_img_prefix($img_ext);
        $where=$ARGV[3];
        $start=$ARGV[4];
        $end=$ARGV[5];
        $from_handle=$ARGV[6];
        $with_audio=$ARGV[7];
        $num_frames=$ARGV[8];

        $width=$ARGV[9];
        $height=$ARGV[10];
        $times=1;
        $undo_cut=0;

        $new_frames=$num_frames;

        smog_chdir("$curtmpdir");

        $allow_missing=0;
        if ($end<0) {
# insert (copy) from (virtual) clip into clipboard
            $allow_missing=1;
            $end=-$end;
        }

        if (defined($ARGV[17])) {
            $times=$ARGV[17];
            if ($times<0) {
# this indicates undoing a previous cut
                $times=-$times;
                $undo_cut=1;
                $new_frames=$num_frames+$end-$start+1;
            } else {
                if ($start>=0) {
                    &clean_old;
                } else {
# $start < 0 tells us to leave backups alone
                    $start=-$start;
                }
                $antialias=&rc_get("antialias");
            }
        }

        if ($with_audio<2) {
            if (!$undo_cut) {
                if (!$allow_missing) {
                    $img_ext2=&get_img_ext("$tmpdir/$from_handle",$start);
                    $img_prefix2=&get_img_prefix($img_ext2);
                } else {
                    $img_ext2=$img_ext;
                    $img_prefix2=$img_prefix;
                }
            }

            &insert;
            if ($panic) {
                unlink "$pidfile";
                exit 1;
            }
            if ($allow_missing) {
                &sig_progress($new_frames);
                sleep(1);
            }
        }

        if ($with_audio) {
            $fps=$ARGV[11];
            $arate=$ARGV[12];
            $achans=$ARGV[13];
            $asamps=$ARGV[14];
            $asigned=$ARGV[15];
            $aendian=$ARGV[16];

            if ($arate*$achans*$asamps!=0) {
                if (!$undo_cut) {
                    if ($with_audio<2) {
                        $end/=$fps;
                        $start=($start-1.)/$fps;
                        $where/=$fps;
                    }
                    if (! -f "audio") {
                        unlink "audio.bak";
                    } else {
                        smog_copy("audio","audio.bak");
                    }
                    if ($panic) {
                        unlink "$pidfile";
                        exit 1;
                    }
                    smog_system_sync();
                } else {
                    $end=-s "$curtmpdir/audio.bak";
                    $end/=$arate*$achans*$asamps/8;
                    $start=0.;
                    if ($with_audio<2) {
                        $where/=$fps;
                    }
                }
                &insert_audio($asamps,$achans,$asigned,$aendian,$undo_cut);
                if (&rc_get("conserve_space") eq "true") {
                    unlink "audio.bak";
                }
                if ($panic) {
                    unlink "$pidfile";
                    exit 1;
                }
            }
        }

        if ($undo_cut) {
            &clean_old;
        }

        &sig_complete;
        exit 0;
    }

    if ($command eq "undo_insert") {
#clean up after an interrupted insert
        $start=$ARGV[2];
        $end=$ARGV[3];
        $frames=$ARGV[4];
        $img_ext=".".$ARGV[5];

# move extra frames back to end
        smog_system_sync();
        &undo_insert;

        $end=$frames;
        &undo(1);
# will abort on failure
        &undo_audio;
# will abort on failure
        &sig_complete;
        exit 0;
    }


# effects

    if (substr($command,0,10) eq "pfxrender_") {
#fx preview
        $fx_prev=1;
        $command=substr($command,1);
        $out_ext=".pre";
    }

    if (substr($command,0,9) eq "fxrender_") {

        smog_chdir("$curtmpdir");
        unlink "$curtmpdir/pause";
        $command=substr($command,9);
        $status=$ARGV[2];
        $start=$ARGV[3];
        $end=$ARGV[4];
        $nwidth=$width=$ARGV[5];
        $nheight=$height=$ARGV[6];

        $img_ext=".".$ARGV[7];
        $img_prefix=&get_img_prefix($img_ext);
        splice(@ARGV,7,1);


        $convert_command=$smog_convert_command;
        $composite_command=$smog_composite_command;

# call render plugins in plugins/effects/rendered/$command

        unless(defined($fx_prev)) {
            $out_ext=".mgk";
            $out_prefix=$img_prefix;
            &clean_old;
        }
        if ($status==0) {
            $plugin_name="$command";
        }
        elsif($status==1) {
            $plugin_dir="$lives_home_dir/plugins/effects/rendered/custom";
            $plugin_name="$plugin_dir/$command";
        }
        else {
            $plugin_dir="$lives_home_dir/plugins/effects/rendered/test";
            $plugin_name="$plugin_dir/$command";
        }
        if ($^O eq "MSWin32") {
# adjust depending on file ext
            my $ext=&get_ext("$plugin_name");
            if ($ext eq ".py") {
                $cmd="python";
            } else {
                $cmd="perl";
            }
            $smcom="$cmd \"$plugin_name\" get_description";
        } else {
            $smcom="\"$plugin_name\" get_description";
        }
        $fx_desc=smog_system_direct($smcom);
        if ($?) {
            sig_system_error($smcom,$?);
            unlink $pidfile;
            exit 1;
        }
        $num_in_channels=(split(/\|/,$fx_desc))[3];

        if ($num_in_channels==0) {
# generators get the out_extension
            $out_ext=$img_ext;
            $out_prefix=&get_img_prefix($img_ext);
        }

        if ($num_in_channels==2) {
# transitions get some extra params
            $img_ext2=".".$ARGV[7];
            $img_prefix2=&get_img_prefix($img_ext2);
            splice(@ARGV,7,1);
            $start2=$ARGV[7];
            $clipboard=$ARGV[8];
        }

        $fps=0;

        if ($^O eq "MSWin32") {
# adjust depending on file ext
            my $ext=&get_ext("$plugin_name");
            if ($ext eq ".py") {
                $cmd="python";
            } else {
                $cmd="perl";
            }
            $fx_caps=smog_system_direct("$cmd \"$plugin_name\" get_capabilities");
        } else {
            $fx_caps=smog_system_direct("\"$plugin_name\" get_capabilities");
        }
        if ($?) {
            sig_system_error($smcom,$?);
            unlink $pidfile;
            exit 1;
        }
        if ($fx_caps&0x8000) {
# is autogenerated
# we are so nice :-), we set:
# $handle,$curtmpdir,$img_ext,$start,$end,$width,$height
# and for transitions $where, $chandle
# remove fxrender $handle $status start end width height (start2 clipboard)
            shift;
            shift;
            shift;
            shift;
            shift;
            shift;
            if ($num_in_channels==2) {
                shift;
                shift;
            }

            if ($^O eq "MSWin32") {
                push @INC,"$plugin_dir";
            }

            $ARGV[0]="process";
            if ($status>1) {
                $error="";
                if ($^O eq "MSWin32") {
                    unless(eval "require (\"$command\")") {
                        $error=$@;
                    }
                } else {
                    unless(eval "require (\"$plugin_name\")") {
                        $error=$@;
                    }
                }
                unless($error eq "") {
                    &sig_error("$plugin_name failed:","$error");
                }
            } else {
                if ($^O eq "MSWin32") {
                    require("$command");
                } else {
                    require("$plugin_name");
                }
            }
            if ($num_in_channels>0) {
                unless(defined($fx_prev)) {
                    &mv_mgk;
                    if ($panic) {
                        unlink "$pidfile";
                        exit 1;
                    }
                }
            } else {
                $frames=&count_frames;
            }
            &sig_complete($nwidth,$nheight,$fps,$frames);
            exit 0;
        } else {
# other (non-perl) language
            shift;
            shift;
            shift;
#remove "fxrender_.." and $handle $status
            my($res_file)="$curtmpdir/.rfx_result";

            my $err;

#img_ext is also in ARGV, but never mind

            if ($num_in_channels==2) {
                if ($^O eq "MSWin32") {
# adjust depending on file ext
                    my $ext=&get_ext("$plugin_name");
                    if ($ext eq ".py") {
                        $cmd="python";
                    } else {
                        $cmd="perl";
                    }
                    $err=smog_system("$cmd \"$plugin_name\" process \"$curtmpdir\" $img_ext $img_ext2 $out_ext @ARGV > \"$res_file\"");
                } else {
                    $err=smog_system("\"$plugin_name\" process \"$curtmpdir\" $img_ext $img_ext2 $out_ext @ARGV > \"$res_file\"");
                }
            }
            elsif($num_in_channels==1) {
                if ($^O eq "MSWin32") {
# adjust depending on file ext
                    my $ext=&get_ext("$plugin_name");
                    if ($ext eq ".py") {
                        $cmd="python";
                    } else {
                        $cmd="perl";
                    }
                    $err=smog_system("$cmd \"$plugin_name\" process \"$curtmpdir\" $img_ext $out_ext @ARGV > \"$res_file\"");
                } else {
                    $err=smog_system("\"$plugin_name\" process \"$curtmpdir\" $img_ext $out_ext @ARGV > \"$res_file\"");
                }
            }
            else {
                if ($^O eq "MSWin32") {
# adjust depending on file ext
                    my $ext=&get_ext("$plugin_name");
                    if ($ext eq ".py") {
                        $cmd="python";
                    } else {
                        $cmd="perl";
                    }
                    $err=smog_system("$cmd \"$plugin_name\" process \"$curtmpdir\" $out_ext @ARGV > \"$res_file\"");
                } else {
                    $err=smog_system("\"$plugin_name\" process \"$curtmpdir\" $out_ext @ARGV > \"$res_file\"");
                }
            }
            if (!$err) {
                if (defined(open IN,"< $res_file")) {
                    read IN,$size,128;
                    ($nwidth,$nheight)=split(" ",$size);
                    close IN;
                    unlink "$res_file";
                }
            } else {
                my(@err)="";
                if (defined(open IN,"< $res_file")) {
                    read IN,$errt,512;
                    @err=split("\n",$errt);
                    close IN;
                    unlink "$res_file";
                }
                &sig_error(@err);
                exit 1;
            }
            unless(defined($fx_prev)) {
                &mv_mgk;
                if ($panic) {
                    unlink "$pidfile";
                    exit 1;
                }
            }
            &sig_complete($nwidth,$nheight);
            exit 0;
        }
    }


    if ($command eq "import_project") {
        $proj_file=$ARGV[2];
        smog_chdir("$tmpdir");
        umask 0;
        $com="tar --no-same-owner -xzf \"$proj_file\"";
        $smerr=smog_system($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        }
        &sig_complete;
        exit 0;
    }

    if ($command eq "export_project") {
        my $set=$ARGV[2];
        my $proj_file=$ARGV[3];
        smog_chdir("$tmpdir");
        $com="tar --exclude=*.bak --exclude=.pid* --exclude .status* --exclude=lock.* --exclude=*.mgk --exclude=*.tmp --exclude=audioclip* -czf \"$proj_file\" $set";
        $smerr=smog_system($com);
        if ($smerr) {
            sig_system_error("$com",$smerr);
            unlink "$pidfile";
            exit 1;
        };


        &sig_complete;
        exit 0;
    }

    if ($command eq "bg_weed") {
        my $opts=$ARGV[2];
        my $bytes_cleaned=&weed($opts);
        &sig_complete($bytes_cleaned);
        exit 0;
    }

    if (!caller) {
        print STDERR "smogrify: unrecognised command $command\n";
        unlink "$pidfile";
        exit 1;
    }
}
return 1;
exit 99;
# just in case
}






######################################################

#subroutines


sub usage {
    print STDERR "$command must have a parameter\n";
    print STDERR "show usage...\n";
}

sub mkname {
    my($num)=shift;
    $ret=sprintf("%08d",$num);
    $ret;
}

sub check_for_pause {
    if (-f "$curtmpdir/pause") {
        smog_system_sync();
    }
    while (-f "$curtmpdir/pause") {
        sleep 1;
    }
}


sub check_for_stop {
    if (defined(open IN,"< $curtmpdir/.status.fileop")) {
        close IN;
        return 1;
    }
    return 0;
}



sub kill_child_pids {
    my($target_pid,$sig)=@_;
    my $pid;
    smog_system("pgrep -P $target_pid > \"$tmpdir/.pids.$target_pid\" 2>/dev/null");

    if ($sig eq "KILL") {
        smog_system("kill -$sig $target_pid >/dev/null 2>&1");
    } else {
        smog_system("pkill -$sig -P $target_pid");
# must not ! >/dev/null 2>&1");
    }

    if (-s "$tmpdir/.pids.$target_pid"&&defined(open IN,"$tmpdir/.pids.$target_pid")) {
        while (<IN>) {
            $pid=$_;
            chomp($pid);
            &kill_child_pids($pid,$sig);
        }
        close IN;
    }

    unlink "$tmpdir/.pids.$target_pid";
}

sub is_writeable {
# see if is writable or creatable
# but do not actually create the file
    my $file=shift;
    if (! -s $nfile) {
        unlink "$nfile";
    }
    $exists=(-f "$nfile");
    if (!$exists) {
        umask 0;
        if ($^O eq "MSWin32") {
            $ret=smog_system("touch.exe \"$nfile\"");
        }
        else {
            $ret=smog_system("touch \"$nfile\"");
        }
        if ($ret) {
            return !$ret;
        }
        if ($^O eq "MSWin32") {
            smog_system("chmod.exe o+w \"$nfile\"");
        } else {
            smog_system("/bin/chmod o+w \"$nfile\"");
        }
        umask $umask;
    }
    smog_system_sync();
    $ret=(-w "$nfile");
    if (!$exists) {
        unlink "$nfile";
    }
    return $ret;
}



sub get_img_ext {
    my $ckdir=shift;
    my $imgno=shift;

    if ($imgno eq "") {
        $imgno=1;
    }

    my $tfile=&mkname($imgno);

    if (-f "$ckdir/$tfile.png") {
        return ".png";
    }

    unless(-f "$ckdir/$tfile.jpg") {
        print STDERR "Warning ! command $command needs to set image type !! Please report this as a bug.\n";
        print STDERR "details: $ckdir/$tfile.jpg not found\n";
    }

    return ".jpg";
}


sub get_img_prefix {
    my $imgext=shift;

    if ($imgext eq ".png") {
        return "PNG32:";
    }

    return "";

}



sub try_to_recover {
#something failed badly during processing
# attempt to recover clip from backup images

    my($smstart,$smend)=@_;
    if ($DEBUG_SMOGRIFY) {
        print STDERR "Beginning clip recovery process for $curtmpdir\n";
    }
    for ($i=$smstart; $i<=$smend; $i++) {
        $name &mkname($i);
        smog_rename("$name.bak","$name$img_ext");
    }
    if ($DEBUG_SMOGRIFY) {
        print STDERR "Clip recovery process succeeded for $curtmpdir\n";
    }
}







sub mv_mgk {
# pass in first param as 1 to show progress of frames
# new files are .mgk files, back up old files to .bak

    my($option)=shift;
    my($i,$name);

    unless(!defined($pidfile)||$pidfile eq "") {
# don't want to get killed in this stage...
        unlink "$pidfile";
    }


    for ($i=$start;$i<=$end;$i++) {
        $name=&mkname($i);
        if (-f "$curtmpdir/$name.mgk") {
            if (-f "$curtmpdir/$name$img_ext") {
                if ($leave_bak==1&&-f "$curtmpdir/$name.bak") {
                    unlink "$curtmpdir/$name$img_ext";
                }
                else {
                    $smres=rename "$curtmpdir/$name$img_ext","$curtmpdir/$name.bak";
                    if (!$smres) {
                        try_to_recover($start,$i-1);
                        if ($DEBUG_SMOGRIFY) {
                            print STDERR "smogrify debug - rename failed ($!): \"$curtmpdir/$name$img_ext\",\"$curtmpdir/$name.bak\"\n";
                        }
                        sig_system_error("Renaming \"$curtmpdir/$name$img_ext\" to \"$curtmpdir/$name.bak\"");
                        unlink $pidfile;
                        exit 1;
                    }
                }
            }
            $smerr=rename( "$curtmpdir/$name.mgk","$curtmpdir/$name$img_ext");
            if (!$smerr) {
                try_to_recover($start,$i);
                if ($DEBUG_SMOGRIFY) {
                    print STDERR "smogrify debug - rename failed ($!): \"$curtmpdir/$name.mgk\",\"$curtmpdir/$name$img_ext\"\n";
                }
                sig_system_error("Renaming \"$curtmpdir/$name.mgk\" to \"$curtmpdir/$name$img_ext\"");
                unlink $pidfile;
                exit 1;
            }
        }
        if ($option==1) {
            &sig_progress($i);
        }
    }

    &sig_pid();
    smog_system_sync();
}



sub mv_pre {
# new files are .pre files, back up old files to .bak
    my ($i,$name);

    unless (!defined($pidfile)||$pidfile eq "") {
# don't want to get killed in this stage...
        unlink "$pidfile";
    }

    smog_chdir("$curtmpdir");
    unlink glob "*.mgk";

    for ($i=$start; $i<=$end; $i++) {
        $name=&mkname($i);
        if (-f "$curtmpdir/$name.pre") {
            if (-f "$curtmpdir/$name$img_ext") {
                unlink "$curtmpdir/$name.bak";
                $smerr=rename("$curtmpdir/$name$img_ext","$curtmpdir/$name.bak");
                if (!$smerr) {
                    try_to_recover($start,$i-1);
                    if ($DEBUG_SMOGRIFY) {
                        print STDERR "smogrify debug - rename failed ($!): \"$curtmpdir/$name$img_ext\",\"$curtmpdir/$name.bak\"\n";
                    }
                    sig_system_error("Renaming \"$curtmpdir/$name$img_ext\" to \"$curtmpdir/$name.bak\"");
                    unlink "$pidfile";
                    exit 1;
                }
            }
            $smerr=rename "$curtmpdir/$name.pre","$curtmpdir/$name$img_ext";
            if (!$smerr) {
                try_to_recover($start,$i);
                if ($DEBUG_SMOGRIFY) {
                    print STDERR "smogrify debug - rename failed ($!): \"$curtmpdir/$name.pre\",\"$curtmpdir/$name$img_ext\"\n";
                }
                sig_system_error("Renaming \"$curtmpdir/$name.pre\" to \"$curtmpdir/$name$img_ext\"");
                unlink "$pidfile";
                exit 1;
            }
        }
    }
    &sig_pid();
    smog_system_sync();
}


sub undo {
# recover .bak files; if param==0 or undefined, move current files to .mgk files
    my($param)=shift;
    if ($param eq "") {
        $param=0;
    }

    my($i,$name);
    for ($i=$start; $i<=$end; $i++) {
        $name=&mkname($i);
        if (-f "$curtmpdir/$name.bak") {
            if ($param==0 && -f "$curtmpdir/$name$img_ext") {
# file may not exist if we are undoing resample for example
                smog_rename("$curtmpdir/$name$img_ext","$curtmpdir/$name.mgk");
            }
            smog_rename("$curtmpdir/$name.bak","$curtmpdir/$name$img_ext");
        }
        &sig_progress($i);
    }
}


sub undo_audio {
    if (-f "$curtmpdir/audio.orig") {
        unlink "$curtmpdir/audio";
        smog_rename("$curtmpdir/audio.orig","$curtmpdir/audio");
        unlink "$curtmpdir/audio.bak";
    } else {
        unlink "$curtmpdir/audio.new";
        if (-f "$curtmpdir/audio") {
            smog_rename("$curtmpdir/audio","$curtmpdir/audio.new");
        }
        if (-f "$curtmpdir/audio.bak") {
            smog_rename("$curtmpdir/audio.bak","$curtmpdir/audio");
        }
        if (-f "$curtmpdir/audio.new") {
            smog_rename("$curtmpdir/audio.new","$curtmpdir/audio.bak");
        }
    }
}


sub backup_audio {
    &clean_old;
    smog_copy("$curtmpdir/audio", "$curtmpdir/audio.bak");
# may set $panic
}

sub cut {
    my($start,$end)=@_;
    my($i,$name);
    smog_chdir("$curtmpdir");
    $frames_cut=$end-$start+1;

    for ($i=$start; $i<=$end; $i++) {
        $name=&mkname($i);
        if (-f "$name$img_ext") {
            smog_rename("$name$img_ext","$name.bak");
        }
        &sig_progress($i);
    }

    for ($i=$end+1; $i<=$frames; $i++) {
        $from=&mkname($i);
        $to=&mkname($i-$frames_cut);
        if (-f "$curtmpdir/$from$img_ext") {
            smog_rename("$curtmpdir/$from$img_ext","$curtmpdir/$to$img_ext");
        }
        &sig_progress($i);
    }
}




sub reverse {
    for ($i=$start; $i<int(($start+$end)/2+.5); $i++) {
        $from=&mkname($i);
        $to=&mkname($end-$i+1);
        $hasfrom=-f "$curtmpdir/$from$img_ext";
        $hasto=-f "$curtmpdir/$to$img_ext";
        if ($hasfrom) {
            if ($hasto) {
                smog_rename("$curtmpdir/$from$img_ext","$curtmpdir/$from.revtemp");
                smog_rename("$curtmpdir/$to$img_ext","$curtmpdir/$from$img_ext");
            }
            &sig_progress($start+($i-$start)*2);
            if ($hasto) {
                smog_rename("$curtmpdir/$from.revtemp","$curtmpdir/$to$img_ext");
            } else {
                smog_rename("$curtmpdir/$from$img_ext","$curtmpdir/$to$img_ext");
            }
        } else {
            &sig_progress($start+($i-$start)*2);
            if ($hasto) {
                smog_rename("$curtmpdir/$to$img_ext","$curtmpdir/$from$img_ext");
            }
        }
        &sig_progress($start+($i-$start)*2+1);
    }
}



sub undo_insert {
    $frames_inserted=$end-$start+1;

    for ($i=$frames+$frames_inserted; $i>$frames; $i--) {
# move any shifted frames back
        $name=&mkname($i);
        $to=&mkname($i-$frames_inserted);
        if (-f "$curtmpdir/$name$img_ext") {
            unlink "$curtmpdir/$to$img_ext";
            smog_rename("$curtmpdir/$name$img_ext","$curtmpdir/$to$img_ext");
        }
    }
}



sub smog_system_sync {
    smog_system("sync");
    smog_system("sync");
    smog_system("sync");
}




sub smog_system {
    my($smcommand)=@_;
    my $smcomret;

    $smcomret=system($smcommand);

    if ($smcomret && $DEBUG_SMOGRIFY) {
        print STDERR "smogrify debug: $smcommand\n";
        print STDERR "smogrify debug - command failed: result was $smcomret\n";
    }

    $smcomret;

}


sub smog_system_direct {
    my($smcommand)=@_;
    my $smcomret;

    $smcomret=`$smcommand`;

    if ($DEBUG_SMOGRIFY && $? != 0) {
        print STDERR "smogrify debug: command was $smcommand\n";
        print STDERR "smogrify debug: result was $smcomret\n";
        print STDERR "smogrify debug: error was $?\n";
    }

    $smcomret;
}



sub smog_rename {
# CAUTION: return value of 0 is error here

    my($smfrom,$smto)=@_;
    my $smcomret=rename "$smfrom","$smto";

    if ($smcomret==0) {
        if ($DEBUG_SMOGRIFY) {
            print STDERR "smogrify debug - rename failed ($!): $smfrom $smto\n";
        }
        sig_system_error("Renaming \"$smfrom\" to \"$smto\"",$!);
        unlink "$pidfile";
        exit 1;
    }

    $smcomret;

}



sub smog_copy {
    my($smfrom,$smto)=@_;
    my $smcomret;

    if ($^O eq "MSWin32") {
        $smcomret=system("cp.exe -f \"$smfrom\" \"$smto\"");

    } else {
        $smcomret=system("/bin/cp -f \"$smfrom\" \"$smto\"");
    }

    if ($smcomret!=0 && -f $smfrom) {
        if ($DEBUG_SMOGRIFY) {
            print STDERR "smogrify debug - copy failed ($!): $smfrom $smto\n";
        }
        $panic=sig_system_error("Copying $smcomret \"$smfrom\" to \"$smto\"",$!);
    }

    $smcomret;

}


sub smog_chdir {
# CAUTION: return value of 0 is error here

    my($smdir)=shift;

    $smcomret=chdir "$smdir";

    if (!$smcomret) {
        if ($DEBUG_SMOGRIFY) {
            print STDERR "smogrify debug - chdir failed ($!): $smdir\n";
        }

        sig_system_error("Changing to directory \"$smdir\"",$!);
        unlink "$pidfile";
        exit 1;
    }
}

sub insert {
    my($from,$to,$frames_to_move);
    $times_inserted=0;
    $factor=1;

    my($nend)=$end;
    my($nstart)=$start;
    my($nwhere)=$where;
    my($nfromdir)=$fromdir;

    my $quick_copy=-1;

    if (!defined($times)) {
        $times=1;
    }
    if (!defined($undo_cut)) {
        $undo_cut=0;
    }

    if (!defined($img_prefix2)) {
        $img_prefix2=&get_img_prefix($img_ext2);
    }
    if (!defined($img_prefix)) {
        $img_prefix=&get_img_prefix($img_ext);
    }

    $fromdir="$tmpdir/$from_handle";
    $frames_to_move=($nend-$nstart+1) *$times;

# make space for new frames
    for ($i=$num_frames; $i>$nwhere; $i--) {
        $from=&mkname($i);
        $to=&mkname($i+$frames_to_move);
        if ($i<=($new_frames-$frames_to_move)&&!$undo_cut&&-f "$curtmpdir/$from$img_ext") {
# this frame will get overwritten, so back it up
            smog_copy("$curtmpdir/$from$img_ext", "$curtmpdir/$from.bak");
            return if $panic;
    }
    if (-f "$curtmpdir/$from$img_ext") {
            smog_rename("$curtmpdir/$from$img_ext","$curtmpdir/$to$img_ext");
        }
        &sig_progress($new_frames-$i);
    }

    $resize_ext=$img_ext;

    if (!defined($antialias)) {
        $antialias="false";
    }


#move from $from_handle
    $j=$start;
    while ($times_inserted<$times) {
        for ($i=$nstart; $i<=$nend; $i++) {
            $from=&mkname($i);
            $to=&mkname($nwhere+$i-$nstart+1);

            if ($undo_cut==1) {
                if (-f "$fromdir/$from.bak") {
                    smog_rename("$fromdir/$from.bak","$curtmpdir/$to$img_ext");
                    return if $panic;
            }
        } else {
            if (! -f "$fromdir/$from$img_ext2") {
                    next if ($allow_missing);
                    while (! -f "$fromdir/$from$img_ext2") {
                        print STDERR "waiting on image $fromdir/$from$img_ext2\n";
                        sleep 1;
                        smog_system_sync();
                    }
                }
                if ($quick_copy==-1) {
                    $quick_copy=0;
                    if ($img_ext eq $img_ext2) {
                        if ($height*$width==0) {
                            $quick_copy=1;
                        } else {
                            $imresact="none";
                            &get_image_size("$fromdir/$from$img_ext2");
                            return if $panic;

                        if ($hsize==$width&&$vsize==$height) {
                                $quick_copy=1;
                            }
                        }
                    }
                }

                if ($quick_copy==1) {
                    smog_copy("$fromdir/$from$img_ext2","$curtmpdir/$to$img_ext");
                    return if $panic;
            } else {
                if ($antialias eq "false") {
                        $com="$smog_convert_command +antialias -size $width"."x$height $img_prefix2\"$fromdir/$from$img_ext2\" -scale $width"."x$height\\! $img_prefix\"$curtmpdir/$to$img_ext\" >$nulfile 2>&1";
                        $smerr=smog_system($com);
                        if ($smerr) {
                            sig_system_error("$com",$smerr);
                            $panic=1;
                            return;
                        }
                    } else {
                        $com="$smog_convert_command -antialias -size $width"."x$height $img_prefix2\"$fromdir/$from$img_ext2\" -scale $width"."x$height\\! $img_prefix\"$curtmpdir/$to$img_ext\" >$nulfile 2>&1";
                        $smerr=smog_system($com);
                        if ($smerr) {
                            sig_system_error("$com",$smerr);
                            $panic=1;
                            return;
                        }
                    }
                }

            }

            &sig_progress(int($new_frames-$where+$j++-$start+1));
        }

        $times_inserted+=$factor;
        $inserted=$nend-$nstart+1;

        if ($times_inserted==2) {
            $nend=$nwhere;
            $nstart=$nwhere-$inserted+1;
            $fromdir=$curtmpdir;
        }
        $nwhere+=$inserted;

        if ($times_inserted>1) {
            $nend+=$inserted;
            $factor*=2;
        }
        while ($times>$times_inserted&&$factor>$times-$times_inserted) {
            $nstart+=($nend-$nstart+1)/2;
            $factor/=2;
        }
    }
}



sub resize_frame {
    my($name,$width,$height)=@_;

    if (!defined($input_ext)) {
        $input_ext=$img_ext;
    }
    if (!defined($antialias)) {
        $antialias="false";
    }

    if (!defined($input_prefix)) {
        $input_prefix=&get_img_prefix($input_ext);
    }
    if (!defined($resize_prefix)) {
        $resize_prefix=&get_img_prefix($resize_ext);
    }

# TODO ****  !!! provide alternate if imagemagick is not available

    if ($antialias eq "false") {
        $com="$smog_convert_command +antialias -size $width"."x$height $input_prefix\"$name$input_ext\" -scale $width"."x$height\\! $resize_prefix\"$name$resize_ext\" >$nulfile 2>&1";
    } else {
        $com="$smog_convert_command -size $width"."x$height $input_prefix\"$name$input_ext\" -resize $width"."x$height\\! $resize_prefix\"$name$resize_ext\" >$nulfile 2>&1";
    }

    $smerr=smog_system($com);
    if ($smerr) {
        sig_system_error("$com",$smerr);
        $panic=1;
    }
}



sub letterbox_frame {
    my($name,$iwidth,$iheight,$owidth,$oheight)=@_;

# frame is at size $iwidth x $iheight (if known, or 0)
# from name is $name$input_ext, to name is $name$output_ext
# center overlay frame in black rect size $owidth x $oheight

# TODO ****  !!! provide alternate if imagemagick is not available

    my $from="$name$in_ext";
    my $to="$name$out_ext";

# overlay frame
    $xstart=int(($owidth-$iwidth)/2);
    $ystart=int(($oheight-$iheight)/2);

#must unlink first in case $to is a symlink (when saving selection)
    unlink "$to";

    $com="$smog_composite_command -compose plus -dissolve 100 -geometry $iwidth"."x$iheight\\!+$xstart\\!+$ystart\\! \"$from\" $blankname \"$to\" >$nulfile 2>&1";
    $smerr=smog_system($com);
    if ($smerr) {
        sig_system_error("$com",$smerr);
        $panic=1;
        return;
    }

}



sub zoom_frame {
    my($name,$centre_x,$centre_y,$width,$height,$rscale)=@_;
# zoom into a frame

# first we will crop the frame to just slightly larger than
# our target, then we will resize, then do an exact crop

# TODO - if we expand an edge a lot, our final crop needs
# adjusting

    if (!defined($antialias)) {
        $antialias="false";
    }
    if (!defined($input_ext)) {
        $input_ext=$img_ext;
    }

    if (!defined($input_prefix)) {
        $input_prefix=&get_img_prefix($input_ext);
    }
    if (!defined($resize_prefix)) {
        $resize_prefix=&get_img_prefix($resize_ext);
    }

    my($left)=int($centre_x-($width/(2.*$rscale)))-1;
    my($top)=int($centre_y-($height/(2.*$rscale)))-1;
    my($right)=int($centre_x+($width/(2.*$rscale)))+1;
    my($bottom)=int($centre_y+($height/(2.*$rscale)))+1;

    if ($left<0) {
        $right-=$left;
        $left=0;
    }
    if ($top<0) {
        $bottom-=$top;
        $top=0;
    }
    if ($right>=$width) {
        $left-=$right-$width+1;
        if ($left<0) {
            $left=0;
        }
        $right=$width-1;
    }
    if ($bottom>=$height) {
        $top-=$bottom-$height+1;
        if ($top<0) {
            $top=0;
        }
        $bottom=$height-1;
    }
    my($nwidth)=$right-$left+1;
    my($nheight)=$bottom-$top+1;

    if ($antialias eq "false") {
        $com="$smog_convert_command -antialias -size $width"."x$height $input_prefix\"$name$input_ext\" -crop $nwidth"."x$nheight\\!+$left\\!+$top\\! -resize $width"."x$height\\! $resize_prefix\"$name$resize_ext\" >$nulfile 2>&1";
    } else {
        $com="$smog_convert_command +antialias -size $width"."x$height $input_prefix\"$name$input_ext\" -crop $nwidth"."x$nheight\\!+$left\\!+$top\\! -resize $width"."x$height\\! $resize_prefix\"$name$resize_ext\" >$nulfile 2>&1";
    }

    $smerror=smog_system($com);

    if ($smerror) {
        sig_system_error("$com",$smerror);
        $panic=1;
    }

}



sub trim_frame {
    my($name,$width,$height,$x,$y,$nwidth,$nheight)=@_;

    if (!defined($input_ext)) {
        $input_ext=$img_ext;
    }
    if (!defined($input_prefix)) {
        $input_prefix=&get_img_prefix($input_ext);
    }
    if (!defined($resize_prefix)) {
        $resize_prefix=&get_img_prefix($resize_ext);
    }
    if (!defined($antialias)) {
        $antialias="false";
    }
    if ($antialias eq "false") {
        $com="$smog_convert_command +antialias -size $width"."x$height $input_prefix\"$name$input_ext\" -crop $nwidth"."x$nheight\\!+$x\\!+$y\\! $resize_prefix\"$name$resize_ext\" >$nulfile 2>&1";
    } else {
        $com="$smog_convert_command -antialias -size $width"."x$height $input_prefix\"$name$input_ext\" -crop $nwidth"."x$nheight\\!+$x\\!+$y\\! $resize_prefix\"$name$resize_ext\" >$nulfile 2>&1";
    }

    $smerror=smog_system($com);

    if ($smerror) {
        sig_system_error("$com",$smerror);
        $panic=1;
    }


}


sub trim_center {
    my($name,$width,$height)=@_;

    if (!defined($input_ext)) {
        $input_ext=$img_ext;
    }

    $imresact="none";
    &get_image_size("$name$input_ext");
    return if ($panic||$hsize==-1);

    if (!defined($input_prefix)) {
        $input_prefix=&get_img_prefix($input_ext);
    }

    if (!defined($resize_prefix)) {
        $resize_prefix=&get_img_prefix($resize_ext);
    }

    unless($hsize>=$width&&$vsize>=$height) {
#composite over a large enough frame
        $size=$hsize;
        if ($vsize>$size) {
            $size=$vsize;
        }

        $xstart=int(($size-$hsize)/2);
        $ystart=int(($size-$vsize)/2);

# make a background frame
        if (!defined($bgcolour)) {
            $bgcolour="#000000";
        }

        $com="$smog_convert_command -size $sizex$size\\! xc:$bgcolour $input_prefix"."blank$input_ext >$nulfile 2>&1";

        $smerror=smog_system($com);

        if ($smerror) {
            sig_system_error("$com",$smerror);
            $panic=1;
            return;
        }

        $com="$smog_composite_command -compose plus -dissolve 100 -geometry $hsizex$vsize\\!+$xstart\\!+$ystart\\! $input_prefix\"$name$input_ext\" $input_prefix"."blank$input_ext $input_prefix\"$name$input_ext\" >$nulfile 2>&1";

        $smerror=smog_system($com);

        if ($smerror) {
            sig_system_error("$com",$smerror);
            $panic=1;
            return;
        }

        $hsize=$vsize=$size;
    }

    $x=int(($hsize-$width)/2);
    $y=int(($vsize-$height)/2);

    $com="$smog_convert_command $input_prefix\"$name$input_ext\" -crop $width" . "x" . $height . "\\!+" . $x . "\\! + " . $y . "\\! $resize_prefix\"$name$resize_ext\" >$nulfile 2>&1";

    $smerror=smog_system($com);

    if ($smerror) {
        sig_system_error("$com",$smerror);
        $panic=1;
        return;
    }

}



sub get_formats {

    if (!defined($sox_version)) {
        $sox_version=&get_sox_version;
    }

    if ($asamps==8) {
        $format=16;
        $signed=0;
        if ($sox_version < 14004001) {
            $xsigned="-u";
        } else {
            $xsigned="-e unsigned-integer";
        }
    } else {
        $signed=1;
        if ($sox_version < 14004001) {
            $xsigned="-s";
        } else {
            $xsigned="-e signed-integer";
        }
        if ($endian==1) {
# little
            $format=128;
        } else {
# big
            $format=256;
        }
    }
}




sub get_file_info {
    $count=0;
    $bpp=24;
# default if none is found
    $fps=0;
# let the front-end handle this if we can't get it ;-)
    $type="Unknown";
    $hsize=0;
    $vsize=0;
    $signed=-1;
    $f_size=0;
    $arate=$asamps=$achans=0;
    $frames=0;
    $asamps=0;

    $endian="";

    $is_mpv=0;

    if ($^O ne "MSWin32") {
# try to force language to English
        $mplay_command="LANGUAGE=en LANG=en ";
    }

    $mplay_command.=&rc_get("video_open_command");
    $file_ident="file_info";

    if ($mplay_command eq "") {
        $mplay_command="\"".&get_mplayer_location."\"";
    }

    if ($mplay_command eq "") {
        $panic=1;
        return;
    }


    if ((split(" ",$mplay_command))[0]=="mpv") {
        $is_mpv=1;
    }

    $id_vid_form="";

    if ($is_audio) {
        $type="Audio";
    }

    smog_chdir("$curtmpdir");

# if mplayer supports the -identify command, use that
# the format changed for 1.0pre1 so now we use -vo null -ao null -frames 0

    unless ($mplay_command eq "") {
        if (defined($is_remote)&&($is_remote>0)) {
# remote files might be streams, so we need to cache a bit before we can identify them
            $com="$mplay_command -identify -vo null -ao null -frames 0 -cache 32 \"$file\" > $file_ident 2>$nulfile <$nulfile";

        }
        else {
            $com="$mplay_command -identify -vo null -ao null -frames 0 \"$file\" > $file_ident 2>$nulfile <$nulfile";
        }

        $smerr=smog_system($com);

        if ($smerr) {
            sig_system_error("$com",$smerr);
            $panic=1;
            return;
        }




        if (-f $file_ident) {

            $length=smog_system_direct("grep ID_LENGTH \"$file_ident\" 2>$nulfile");
            $length=(split("=",(split("\n",$length))[0]))[1];
            chomp($length);

            if ($length eq "0" &&!(defined($is_remote)&&($is_remote>0))) {
                $com="$mplay_command -demuxer lavf -identify -vo null -ao null -frames 0 \"$file\" > $file_ident 2>$nulfile <$nulfile";

                $smerr=smog_system($com);

                if ($smerr) {
                    sig_system_error("$com",$smerr);
                    $panic=1;
                    return;
                }



            }

        }


        if (-f $file_ident) {
            if (!$is_mpv) {
                $id_vid_form=smog_system_direct("grep ID_VIDEO_CODEC \"$file_ident\" 2>$nulfile");
                $id_vid_form=(split("=",(split("\n",$id_vid_form))[0]))[1];
                chomp($id_vid_form);

                if ($id_vid_form eq "") {
                    $id_vid_form=smog_system_direct("grep ID_VIDEO_FORMAT \"$file_ident\" 2>$nulfile");
                    $id_vid_form=(split("=",(split("\n",$id_vid_form))[0]))[1];
                    chomp($id_vid_form);
                }

                if ($id_vid_form eq "") {
                    $id_vid_form=smog_system_direct("grep VIDEO: \"$file_ident\" 2>$nulfile");
                    $id_vid_form=(split("  ",(split("\n",$id_vid_form))[0]))[1];
                    chomp($id_vid_form);
                }

            }
            else {
                $id_vid_form=smog_system_direct("grep -i 'selected video' \"$file_ident\" 2>$nulfile");
                $id_vid_form=(split("video codec: ",(split("\n",$id_vid_form))[0]))[1];
                chomp($id_vid_form);
            }


            if (! -f $file_ident) {return;};

            if (!$is_mpv) {
                $id_aud_form=smog_system_direct("grep ID_AUDIO_FORMAT \"$file_ident\" 2>$nulfile");
                $id_aud_form=(split("=",(split("\n",$id_aud_form))[0]))[1];
                chomp($id_aud_form);

                if ($id_aud_form eq "") {
                    $id_aud_form=smog_system_direct("grep AUDIO: \"$file_ident\" 2>$nulfile");
                    $id_aud_form=(split("  ",(split("\n",$id_aud_form))[0]))[1];
                    chomp($id_aud_form);
                }
            }
            else {
                $id_aud_form=smog_system_direct("grep -i 'selected audio' \"$file_ident\" 2>$nulfile");
                $id_aud_form=(split("audio codec: ",(split("\n",$id_aud_form))[0]))[1];
                chomp($id_aud_form);
            }

            if (! -f $file_ident) {return;};

            if ($id_vid_form eq "") {
                if (!($id_aud_form eq "")) {
                    $id_vid_form="Audio";
                }
            }

            unless ($id_vid_form eq "") {
# this could probably be done better using regexp...
                $type=$id_vid_form;
                if (! -f $file_ident) {return;};
                $asamps=smog_system_direct("grep AUDIO: \"$file_ident\" 2>$nulfile");
                $asamps=(split(" ",$asamps))[5];
                chomp($asamps);

                if ($asamps =~ /^f/) {
                    $asamps=32;
                    $signed=1;
                }
                elsif ($asamps =~ /^s/) {
                    $asamps=substr($asamps,1,-1);
                    $signed=1;
                }
                elsif ($asamps =~ /^u/) {
                    $asamps=substr($asamps,1,-1);
                    $signed=0;
                }

                $audend=substr($asamps,-2,2);

                if ($audend eq "le") {
# le
                    $endian=1;
                }
                elsif ($audend eq "be") {
                    $endian=0;
                }

                if (! -f $file_ident) {return;};
                $bpp=smog_system_direct("grep VIDEO: \"$file_ident\" 2>$nulfile");
                $bpp=(split("bpp",(split("  ",$bpp))[3]))[0];
                chomp($bpp);

                if (! -f $file_ident) {return;};
                if ($bpp eq "") {
                    $bpp=smog_system_direct("grep \"Image size:\" \"$file_ident\" 2>$nulfile");
                    @tmp=split(" ",$bpp);
                    $bpp=substr($tmp[5],1,2);
                }

                if (! -f $file_ident) {return;};
                $hsize=smog_system_direct("grep ID_VIDEO_WIDTH \"$file_ident\" 2>$nulfile");
                $hsize=(split("=",(split("\n",$hsize))[0]))[1];
                chomp($hsize);

                if (! -f $file_ident) {return;};
                $vsize=smog_system_direct("grep ID_VIDEO_HEIGHT \"$file_ident\" 2>$nulfile");
                $vsize=(split("=",(split("\n",$vsize))[0]))[1];
                chomp($vsize);

                if (! -f $file_ident) {return;};
                $fps=smog_system_direct("grep ID_VIDEO_FPS \"$file_ident\" 2>$nulfile");
                $fps=(split("=",(split("\n",$fps))[0]))[1];
                chomp($fps);

                if (! -f $file_ident) {return;};
                $arate=smog_system_direct("grep ID_AUDIO_RATE \"$file_ident\" 2>$nulfile");
                my @results=split("\n",$arate);
                foreach my $val (@results) {
                    $arate=(split("=",$val))[1];
                    chomp($arate);
                    last if $arate>0;
            }
            if (! -f $file_ident) {return;};
                if ($arate==0) {
                    $arate=smog_system_direct("grep Samplerate \"$file_ident\" 2>$nulfile");
                    $arate=(split(": ",(split("\n",$arate))[0]))[1];
                    chomp($arate);
                }


                if (! -f $file_ident) {return;};
                $achans=smog_system_direct("grep ID_AUDIO_NCH \"$file_ident\" 2>$nulfile");
                chomp($achans);
                $achans=(split("\n",$achans))[-1];
                $achans=(split("=",(split("\n",$achans))[0]))[1];

                if (! -f $file_ident) {return;};
                $abitrate=smog_system_direct("grep ID_AUDIO_BITRATE \"$file_ident\" 2>$nulfile");
                chomp($abitrate);
                $abitrate=(split("\n",$abitrate))[-1];
                $abitrate=(split("=",(split("\n",$abitrate))[0]))[1];


                unless ($id_aud_form eq "" || $achans>0) {
# need to look deeper for $achans
                    $adets=smog_system_direct("grep AO: \"$file_ident\" 2>$nulfile");

                    $adets=(split("AO: ",$adets))[1];
                    chomp($adets);

                    $arate=(split(" ",$adets))[1];
                    if ($arate eq "[oss]") {
                        $arate=(split(" ",$adets))[2];
                        $achans=(split(" ",$adets))[3];

                    }
                    else {
                        $achans=(split(" ",$adets))[2];
                    }
                    chomp($arate);
                    chomp($achans);

                    $arate=$arate*1;
                    $achans=$achans*1;
                }

# grep may fail with error 256

                if (! -f $file_ident) {return;};
                $comment=smog_system_direct("grep Comments: \"$file_ident\" 2>$nulfile");
                @tmp=split(" ",$comment);
                shift(@tmp);
                $comment=join(" ",@tmp);
                chomp($comment);

                if (! -f $file_ident) {return;};
                $title=smog_system_direct("grep Title: \"$file_ident\" 2>$nulfile");
                @tmp=split(" ",$title);
                shift(@tmp);
                $title=join(" ",@tmp);
                chomp($title);

                if (! -f $file_ident) {return;};
                $title=smog_system_direct("grep Author: \"$file_ident\" 2>$nulfile");
                @tmp=split(" ",$author);
                shift(@tmp);
                $author=join(" ",@tmp);
                chomp($author);

                if (! -f $file_ident) {return;};
                $count=smog_system_direct("grep \"frames  total\" \"$file_ident\" 2>$nulfile");
                @tmp=split(" ",$count);
                $count=$tmp[2];
                chomp($count);

                if ($count eq "") {
                    $count=int($fps*$length+.5);
                }
                if ($count eq "") {
                    $count=1000000; #take a guess...
                }
            }
            if ($asamps==0&&$arate*$achans>0) {
                $asamps=$abitrate/$arate/$achans;
            }
            unlink "$file_ident";
        }

    }


    if (($hsize*$vsize==0||$count eq "")&&!$is_audio) {
# test even if mplayer thinks it is audio (at least some png files are misread)
        $name=&mkname(1);
        unless (-f "$curtmpdir/$name") {
# see if it is image(s)
            &open_images(1);
            if ($hsize==-1) {
                $hsize=$vsize=0;
            }
            opendir DIR,$curtmpdir;
            while ($file2=readdir(DIR)) {
                if ($file2 =~ /$img_ext$/) {
                    $count++;
                    $imresact="none";
                    if ($only_first) {
                        unlink glob "$curtmpdir/*$img_ext";
                        last;
                    }
                    else {
                        $f_size+=-s $file2;
                    }
                }
                else {
                    unless ($file2 eq $audio_in) {
                        unlink "$file2";
                    }
                }
            }
            closedir DIR;

            if ($count) {
# got image(s)
                $frames=$count;
# got image(s)
                if ($img_ext eq ".jpg") {
                    $type="jpeg";
                }
                else {
                    $type="png";
                }

                $count=0;
                $name=&mkname(1);
            }
        }
    }

    if ($signed==-1) {
        if ($asamps==8) {
            $signed=0;
        }
        else {
            $signed=1;
        }
    }

    if ($endian eq "") {
        $endian=&get_endian; # assume audio endian matches machine endian
    }

# get file size
    if ($f_size==0) {
        $f_size= -s $file;
    }

    if ($asamps<5&&$asamps>0) {
        $asamps=16;
    }

    if ($type=~ m/^\[/) {
    $type=substr($type,1,-1);
    }

}





sub convert_audio_to_raw {
#convert .wav to raw pcm using sox or mplayer

    my $smcom;

    &get_formats;

    my $ap=&rc_get("audio_player");

    if (!($ap eq "mplayer")&&!($ap eq "mplayer2")) {
        $smcom="sox -t .wav \"$audio_in\" -t .raw $xsigned \"$audio_out\" > $nulfile 2>&1";
    }
    else {
        $format=&get_mplayer_format;
        $smcom=&rc_get("video_open_command") . " -quiet \"$audio_in\" -ao pcm:nowaveheader:file=\"$audio_out\" $format >$nulfile 2>&1";
    }

    my $smerr=smog_system($smcom);

    if ($smerr) {
        sig_system_error("$smcom",$smerr);
        $panic=1;
        return;
    }

    smog_system_sync();
}



sub convert_audio_to_wav {
#convert raw to .wav

#WARNING - $asamps and $nasamps are in bits
    my ($aasamps)=$asamps/8;
    my $smcom;


    smog_chdir("$curtmpdir");
    if (&location("sox") eq "") {
        $format=&get_mplayer_format;
        $smcom=&rc_get("video_open_command") . " -quiet -ao pcm -demuxer rawaudio -rawaudio rate=$arate:channels=$achans:samplesize=$aasamps -ao pcm:waveheader $format -vo null \"$audio_in\" >$nulfile 2>&1 <$nulfile";
    }
    else {
        if (!defined($sox_version)) {
            $sox_version=&get_sox_version;
        }

        if ($sox_version<13000000) {
            $nodither="";
            if ($asamps==8) {
                $sasamps="b";
            }
            else {
                $sasamps="w";
            }
        }
        else {
            $nodither="-D";
            $sasamps=$aasamps;

            if ($sox_version >= 14004001) {
                if ($aasamps == 1) {
                    $sasamps = "b 8";
                }
                elsif ($aasamps == 2) {
                    $sasamps = "b 16";
                }
                elsif ($aasamps == 3) {
                    $sasamps = "b 24";
                }
                elsif ($aasamps == 4) {
                    $sasamps = "b 32";
                }
                elsif ($aasamps == 8) {
                    $sasamps = "b 64";
                }

            }

        }

        if (!defined($nrate)) {
            $nrate=$arate;
        }

        if (!defined($nchans)) {
            $nchans=$achans;
        }

        if (!defined($nasamps)) {
            $nasamps=$asamps;
        }


        if (!defined($asigned)) {
            if ($sox_version < 14004001) {
                if ($asamps==8) {
                    $asigned="-u";
                }
                else {
                    $asigned="-s";
                }
            }
            else {
                if ($aasamps==8) {
                    $asigned="-e unsigned-integer";
                }
                else {
                    $asigned="-e signed-integer";
                }
            }
        }


        if (!defined($nsigned)) {
            if ($nasamps==8) {
                if ($sox_version < 14004001) {
                    $nsigned="-u";
                }
                else {
                    $nsigned="-e unsigned-integer";
                }
            }
            else {
                $nsigned=$asigned;
            }
        }

        $nnasamps = $nasamps/8;

        if ($sox_version >= 14004001) {
            if ($nnasamps == 1) {
                $nnasamps = "b 8";
            }
            elsif ($nnasamps == 2) {
                $nnasamps = "b 16";
            }
            elsif ($nnasamps == 3) {
                $nnasamps = "b 24";
            }
            elsif ($nnasamps == 4) {
                $nnasamps = "b 32";
            }
            elsif ($nnasamps == 8) {
                $nnasamps = "b 64";
            }

        }

        $smcom="sox $nodither -t .raw -r $arate $asigned -$sasamps -c $achans \"$audio_in\" -t .wav -r $nrate -c $nchans $nsigned -$nnasamps \"$curtmpdir/audiodump.wav\" >$nulfile 2>&1";

    }

    my $smerr=smog_system("$smcom");
    if ($smerr) {
        sig_system_error("$smcom",$smerr);
        $panic=1;
        return;
    }

    smog_system_sync();
}




#clip (actually, trim) the audio from $start seconds to $end seconds
sub clip_audio {
    my ($start,$end)=@_;
    my $smres;

    if ($achans==0) {
        return;
    }

    $audio_in=$curtmpdir."/audio";
    $audio_out=$curtmpdir."/audioclip";

    unlink "$audio_out";
    if ($^O eq "MSWin32") {
        $smres=smog_system("touch.exe \"$audio_out\"");
    }
    else {
        $smres=smog_system("touch \"$audio_out\"");
    }
    if ($smres) {
        $panic=sig_write_error("$audio_out");
        return;
    }

    if ($^O eq "MSWin32") {
#smog_system("chmod.exe 600 \"$audio_out\"");
    }
    else {
        smog_system("/bin/chmod 600 \"$audio_out\"");
    }

    $align=$achans*$asamps/8;

    $spos=&align($arate*$align*$start);
    $epos=&align($arate*$align*$end);

    my ($fsize)= (-s $audio_in);

    if ($epos>$fsize) {
        $epos=$fsize;
    }
    if ($spos>$epos) {
        $spos=$epos;
    }

    my ($size)=($epos-$spos);
    if ($size>$fsize) {
        $size=$fsize;
    }

    if ($size>0) {
        unlink "$audio_out";

        $fdd_in=$audio_in;
        $fdd_out=$audio_out;

        &fast_dd($size,$spos,0);
        return if ($panic);
    }

    smog_system_sync();
    $audio_out;
}


sub resample_audio {
#WARNING - $asamps and $nasamps are in bits

    $endian=&get_endian;

    if (!defined($sox_version)) {
        $sox_version=&get_sox_version;
    }

    if ($sox_version<13000000) {
        if ($asamps==8) {
            $osamps="b";
        }
        else {
            $osamps="w";
        }


        if ($nsamps==8) {
            $nsamps="b";
        }
        else {
            $nsamps="w";
        }
        $nodither="";
    }
    else {
        $osamps=$asamps/8;
        $nsamps/=8;
        $nodither="-D";

        if ($sox_version >= 14004001) {
            if ($osamps == 1) {
                $osamps = "b 8";
            }
            elsif ($osamps == 2) {
                $osamps = "b 16";
            }
            elsif ($osamps == 3) {
                $osamps = "b 24";
            }
            elsif ($osamps == 4) {
                $osamps = "b 32";
            }
            elsif ($osamps == 8) {
                $osamps = "b 64";
            }

            if ($nsamps == 1) {
                $nsamps = "b 8";
            }
            elsif ($nsamps == 2) {
                $nsamps = "b 16";
            }
            elsif ($nsamps == 3) {
                $nsamps = "b 24";
            }
            elsif ($nsamps == 4) {
                $nsamps = "b 32";
            }
            elsif ($nsamps == 8) {
                $nsamps = "b 64";
            }

        }

    }

    if ($sox_version < 14000000) {
        if ($asigned==1) {
            $osigned="-s";
        }
        else {
            $osigned="-u";
        }

        if ($nsigned==1) {
            $nsigned="-s";
        }
        else {
            $nsigned="-u";
        }
    }
    else {
        if ($asigned==1) {
            $osigned="-e signed-integer";
        }
        else {
            $osigned="-e unsigned-integer";
        }

        if ($nsigned==1) {
            $nsigned="-e signed-integer";
        }
        else {
            $nsigned="-e unsigned-integer";
        }
    }

    if ($aendian==$endian) {
        $oendian="";
    }
    else {
        $oendian="-x";
    }

    if ($nendian==$endian) {
        $nendian="";
    }
    else {
        $nendian="-x";
    }

    if (defined($stretch)) {
        $com="sox $nodither -t .raw -r $arate -c $achans $osigned -$osamps $oendian \"$audio_in\" -t .raw -r $nrate -c $nchans $nsigned $nendian -$nsamps \"$audio_out\" stretch $stretch>$nulfile 2>&1";
    }
    else {
        $com="sox $nodither -t .raw -r $arate -c $achans $osigned -$osamps $oendian \"$audio_in\" -t .raw -r $nrate -c $nchans $nsigned $nendian -$nsamps \"$audio_out\">$nulfile 2>&1";
    }
    $smerr=smog_system($com);
    if ($smerr) {
        sig_system_error("$com",$smerr);
        $panic=1;
    }
}

sub get_ext {
    my $fname=shift;

    my $ext=(split(/\./,$fname))[-1];

    if ($ext=~/(.*)\"$/) {
    $ext=$1;
}

    return ".".$ext;
}



    sub insert_audio {
#what we are going to do:
# 1) copy the end of the audio (after insertion) to a new file [$where to $to_end]
# 2) insert silence up to $where (if necessary)
# 3) insert the new section [$start to $end at $where]
# 4) insert silence up to $where+$end (if necessary)
# 5) then put the end back

#input params:
# $where - insertion pt -in seconds
# $start, $end - new section - in seconds
# $from_handle - handle of from file
# $to_end - size of to file

#if $arate<0, we will insert silence from $where to $where+$start-$end

    my ($xxsamps,$xxchans,$xxsigned,$xxendian,$needstemp)=@_;

    if ($achans==0) {
    return;
}

    if (!defined($times)) {
    $times=1;
}

    my ($audio_from)=$audio_from;

    my ($audio_to)="$curtmpdir/audio";
    if (defined($from_handle)) {
    if ($undo_cut) {
    $audio_from="$tmpdir/$from_handle/audio.bak";
}
    else {
    $audio_from="$tmpdir/$from_handle/audio";
}
}
    my ($audio_temp)="$curtmpdir/audio.temp";

    unlink "$audio_temp";
    if ($^O eq "MSWin32") {
    $smres=smog_system("touch.exe \"$audio_temp\"");
}
else {
    $smres=smog_system("touch \"$audio_temp\"");
}

if ($smres) {
$panic=sig_write_error("$audio_temp");
    return;
}

if ($^O eq "MSWin32") {
#smog_system("chmod.exe 600 \"$audio_temp\"");
}
else {
smog_system("/bin/chmod 600 \"$audio_temp\"");
}

$silence=0;
if ($arate<0) {
$silence=1;
$arate=-$arate;
}

$align=$achans*$asamps/8;

my $ospos=$spos=&align($arate*$align*$start);
my $oepos=$epos=&align($arate*$align*$end);
my $owpos=$wpos=&align($arate*$align*$where);


# step 1 - copy end to temp
if ($needstemp) {
my $to_end=-s $audio_to;
my $size=$to_end-$wpos;
if ($size>0) {
        $fdd_in=$audio_to;
        $fdd_out=$audio_temp;

        &fast_dd($size,$wpos,0);
        return if ($panic);
    }
}

$audio_file=$audio_to;


# step 2 - pad with silence to insertion point (if necessary)
&append_silence(0,$wpos,$xxsamps,$xxchans,$xxsigned,$xxendian);
return if $panic;


####################################################
# step 3 - insert new section (possibly multiple times)

my ($nepos)=$epos;
my ($nspos)=$spos;
my ($nwpos)=$wpos;

$times_inserted=0;
$factor=1;
$silence_remembered=0;

my ($xaudio_from)=$audio_from;

while ($times_inserted<$times) {
    $size=$nepos-$nspos;
    if ($size>0) {
            if ($silence) {
                $fsize=-s $audio_to;
                $fsize=&align($fsize-$nwpos); #becomes offset
                &append_silence($fsize,$nwpos+$size,$xxsamps,$xxchans,$xxsigned,$xxendian);
                return if $panic;
        }
        else {
            $fdd_in=$xaudio_from;
            $fdd_out=$audio_to;
            $afsize=-s $fdd_in;
            if ($size+$nspos>$afsize) {
                    $size=$afsize-$nspos;
                }
                &fast_dd($size,$nspos,$nwpos);
                return if ($panic);
            }
        }

        $times_inserted+=$factor;
# step 4, pad with silence if necessary
        if (! $silence && (-s $audio_temp||$times_inserted<$times)) {
            $inserted=$oepos-$nspos;
            &append_silence(0,$nwpos+$inserted,$xxsamps,$xxchans,$xxsigned,$xxendian);
            return if ($panic);
            unless ($silence_remembered>0) {
                $silence_remembered=$oepos-$nepos;
            }
        }
        else {
            $inserted=$nepos-$nspos;
        }

        if ($times_inserted==2) {
            $oepos=$nepos=$nwpos;
            $nspos=$nwpos-$inserted;
            $xaudio_from=$audio_to;
        }

        $nwpos+=$inserted;

        if ($times_inserted>1) {
            $nepos+=$inserted;
            $oepos+=$inserted;
            $factor*=2;
        }
        while ($times>$times_inserted&&$factor>$times-$times_inserted) {
            $nspos+=($oepos-$nspos)/2;
            $factor/=2;
        }

        if ($factor+$times_inserted==$times) {
# this will be our last insertion...
            if (-s $audio_temp==0) {
                $nepos-=$silence_remembered;
            }
        }

    }


####################################################

#step 5 - copy end back after insertion
if ($needstemp) {
$size=&align(-s $audio_temp);
    if ($size>0) {
        $fdd_in=$audio_temp;
        $fdd_out=$audio_to;

        &fast_dd($size,0,$nwpos);
        return if ($panic);
    }

    unlink "$audio_temp";
}
else {
# copy from audio.bak to output
    my ($audio_bak)="$curtmpdir/audio.bak";
    $size=-s $audio_bak;
    $size=&align($size-$owpos);
    if ($size>0) {
        $fdd_in=$audio_bak;
        $fdd_out=$audio_to;

        &fast_dd($size,$owpos,$nwpos);
        return if ($panic);
    }
}

smog_system_sync();

}



sub cut_audio {
#what we are going to do:
#1) copy up to $start to a new file
#2) back up the section to be deleted
#3) append the section after $end to the new file
#4) copy the new file to the original
#$start, $end are in seconds

    if ($achans==0) {
        return;
    }

    my ($audio_in)="$curtmpdir/audio";
    my ($audio_temp)="$curtmpdir/audio.temp";
    my ($audio_bak)="$curtmpdir/audio.bak";

    unlink "$audio_temp";
    unlink "$audio_bak";

    if ($end==0.) {
#delete all audio
        smog_rename("$audio_in","$audio_bak");
    }
    else {
        if ($^O eq "MSWin32") {
            $smres=smog_system("touch.exe \"$audio_temp\"");
        }
        else {
            $smres=smog_system("touch \"$audio_temp\"");
        }
        if ($smres) {
            $panic=sig_write_error("$audio_temp");
            return;
        }
        if ($^O eq "MSWin32") {
#smog_system("chmod.exe 600 \"$audio_temp\"");
        }
        else {
            smog_system("/bin/chmod 600 \"$audio_temp\"");
        }

        $align=$achans*$asamps/8;

# step 1
        $spos=&align($arate*$align*$start);
        $epos=&align($arate*$align*$end);

        my ($fsize)=&align(-s $audio_in);

        if ($epos>$fsize) {
            $epos=$fsize;
        }
        if ($spos>$epos) {
            $spos=$epos;
        }

        $seekstart=$spos;
        my ($size)=$spos;

        if ($size>0) {
            $fdd_in=$audio_in;
            $fdd_out=$audio_temp;

            &fast_dd($size,0,0);
            return if $panic;
    }

#step 2
    $size=($epos-$spos);

        if ($size>0) {
            $fdd_in=$audio_in;
            $fdd_out=$audio_bak;

            &fast_dd($size,$spos,0);
            return if $panic;
    }


#step 3
    $spos=$epos;
    $epos=$fsize;
    $size=($epos-$spos);

        if ($size>0) {
            $fdd_in=$audio_in;
            $fdd_out=$audio_temp;

            &fast_dd($size,$spos,$seekstart);
            return if $panic;
    }

# step 4
    unlink "$audio_in";
    smog_rename( "$audio_temp", "$audio_in");
    }

    if (-z $audio_in) {
        unlink "$audio_in";
    }

    smog_system_sync();
}


sub align {
    my ($guess)=shift;
# align our audio cuts so we don't end halfway through a sample/channel
    if (!defined($align)) {
        $align=$achans*$asamps/8;
    }
    $guess=int($guess/$align+.5) *$align;
    return $guess;
}


sub append_silence {
#pad from end - $offset of $audio_file to byte $end-1 with zeros
    my($offset,$end,$asamps,$achans,$asigned,$aendian,$audio_file)=@_;
    if ($audio_file eq "") {
        $audio_file="$curtmpdir/audio";
    }

    unless(-f $audio_file) {
        if ($^O eq "MSWin32") {
            $smres=smog_system("touch.exe \"$audio_file\"");
        } else {
            $smres=smog_system("touch \"$audio_file\"");
        }
        if ($smres) {
            $panic=sig_write_error("$audio_file");
            return;
        }
        if ($^O eq "MSWin32") {
#smog_system("chmod.exe 600 \"$audio_file\"");
        } else {
            smog_system("/bin/chmod 600 \"$audio_file\"");
        }
    }

    my $gsize= -s $audio_file;
    my $fsize=&align($gsize-$offset);
#insert at $fsize-$offset
    my $size=&align($end-$fsize);
#insert to $end

    if ($size>0) {
        if ($asigned==1) {
            $fdd_out=$audio_file;
            if ($^O eq "MSWin32") {
                $smres=smog_system("touch.exe \"$audio_file\"");
                if ($smres) {
                    $panic=sig_write_error("$audio_file");
                    return;
                }
                open AUD,"+<","$audio_file" or $panic=sig_write_error("$audio_file");
                return if $panic;
            seek AUD,$gsize-$offset,SEEK_SET or $panic=sig_write_error("$audio_file");
                return if $panic;
            for ($i=0; $i<$size; $i++) {
                    print AUD chr(0) or $panic=sig_write_error("$audio_file");
                    return if $panic;
            }
        } else {
            $fdd_in="/dev/zero";
            &fast_dd($size,0,$fsize);
            }
            return if $panic;
    } else {
        if ($^O eq "MSWin32") {
                $smres=smog_system("touch.exe \"$audio_file\"");
            } else {
                $smres=smog_system("touch \"$audio_file\"");
            }
            if ($smres) {
                $panic=sig_write_error("$audio_file");
                return;
            }
            open AUD,"+<","$audio_file" or $panic=sig_write_error("$audio_file");
            return if $panic;
        seek AUD,$gsize-$offset,SEEK_SET or $panic=sig_write_error("$audio_file");
            return if $panic;
        if ($asamps==8) {
                for ($i=0; $i<$size; $i++) {
                    print AUD chr(128) or $panic=sig_write_error("$audio_file");
                    return if $panic;
            }
        } else {
            if ($aendian) {
                    for ($i=0; $i<$size; $i+=2*$achans) {
                        for ($j=0; $j<$achans; $j++) {
                            print AUD chr(0) or $panic=sig_write_error("$audio_file");
                            return if $panic;
                        print AUD chr(128) or $panic=sig_write_error("$audio_file");
                            return if $panic;
                    }
                }
            } else {
                for ($i=0; $i<$size; $i+=2*$achans) {
                        for ($j=0; $j<$achans; $j++) {
                            print AUD chr(128) or $panic=sig_write_error("$audio_file");
                            return if $panic;
                        print AUD chr(0) or $panic=sig_write_error("$audio_file");
                            return if $panic;
                    }
                }
            }
        }
        close AUD;
    }
}
}




sub open_images {
# set $file before calling this function
# set $only_first to 1 to just open the first image in a directory
# set $height $width to force a particular size, otherwise $height=$width=0 to open all to the first image size
# if first image size cannot be obtained $dwidth and $dheight are used

my($i)=shift;
    my $orig=$i;

    if (-d $file) {
# is a directory

        $dir=$file;
        opendir DIR,$dir;
        my @files=readdir(DIR);
        closedir DIR;

        unless($only_first) {
# open in numeric order
            @files = sort {byfile($a,$b)}(@files);
            if (!defined($antialias)) {
                $antialias=&rc_get("antialias");
            }
        }

        foreach(@files) {
            $file="$dir/$_";
            unless($_ =~ /^\./||(! -f $file)||(-z $file)) {
                $nframes=&open_single_image($i);
                return if $panic;
            if (-s "$curtmpdir/$name$img_ext") {
                    if ($only_first) {
                        $i++;
                        last;
                    } else {
                        $i+=$nframes;
                    }
                } else {
                    unlink "$curtmpdir/$name$img_ext";
                }
            }
        }
    } else {
        &open_single_image($i);
        return if $panic;
    unless(-s "$curtmpdir/$name$img_ext") {
            unlink "$curtmpdir/$name$img_ext";
        }
    }
    return $i-$orig;
}



sub byfile {
# sort files in numerical-alpha order

#thanks to dominus !
    my @a = split /(\d+)/, $a;
    my @b = split /(\d+)/, $b;
    my $M = @a > @b ? @a : @b;
    my $res = 0;
    for (my $i = 0; $i < $M; $i++) {
        return -1 if ! defined $a[$i];
        return 1 if  ! defined $b[$i];
        if ($a[$i] =~ /\d/) {
            $res = $a[$i] <=> $b[$i];
        } else {
            $res = $a[$i] cmp $b[$i];
        }
        last if $res;
}
$res;
}





sub open_single_image {
# set $hsize and $vsize to force the image size, set to 0 to autoresize
#identify hangs if the file extension is ".avi" or ".mp4" or ".mpg"


my $i=shift;
my $j;

$name=&mkname($i);
    my $nframes=0;

    if ($file =~ /:\/\//) {
    return 0;
}

if (!defined($file_ext)) {
    $file_ext=&get_ext("$file");
}

if ($file_ext eq ".avi"||$file_ext eq ".mp4"||$file_ext eq ".mpg"||$file_ext eq ".ogg"||$file_ext eq ".mov"||$file_ext eq ".ogv"||
        $file_ext eq ".webm"||$file_ext eq ".mkv"||$file_ext eq ".asf"||$file_ext eq ".wmv"||$file_ext eq ".flv"||$file_ext eq ".mng"||
        $file_ext eq ".dv"||$file_ext eq ".mp3" || $file_ext eq ".mpeg") {
# need to set $name before we return
return 0;
}

if ($hsize*$vsize==0) {
&get_image_size($file);
    return 0 if ($panic||$hsize==-1);
}

if ($hsize*$vsize==0) {
return 0;
}

smog_system_sync();

if ($antialias eq "false") {
$com="$smog_convert_command +antialias \"$file\" -scale $hsize"."x"."$vsize\\! $img_prefix\"$curtmpdir/$name$img_ext\" > $nulfile 2>&1";
} else {
$com="$smog_convert_command \"$file\" -resize $hsize"."x"."$vsize\\! $img_prefix\"$curtmpdir/$name$img_ext\" >$nulfile 2>&1";
}


$smerr=smog_system($com);

if ($smerr) {
sig_system_error("$com",$smerr);
    $panic=1;
    return 0;
}


#convert gives multiple frames for e.g. animated gif
$found=1;
for ($j=0; $found==1; $j++) {
if (-f "$curtmpdir/$name-$j$img_ext") {
        $newname=&mkname($i+$j);
        smog_rename("$curtmpdir/$name-$j$img_ext","$curtmpdir/$newname$img_ext");
        $nframes++;

    } else {
        $found=0;
    }
}

if ($hsize*$vsize==0) {
&get_image_size("$curtmpdir/$name$img_ext");
}

if ($hsize*$vsize>0&&$nframes==0) {
$nframes=1;
}

return $nframes;

}



sub get_image_size {
# returns $hsize,$vsize and $bpp for $1
my($file)=shift;
    my($i);

#identify hangs if the file extension is ".avi" or ".mp4"...maybe more...
    my($file_ext)=&get_ext("$file");

    if ($file_ext eq ".avi"||$file_ext eq ".mp4"||$file_ext eq ".mpg"||$file_ext eq ".mpeg") {
        $height=$width=$bpp=0;
        return;
    }

$bpp=8; # default for images
        if (!defined($imresact)) {
                $imresact=&rc_get("image_resize_action");
            }

# imresact can be: default - resize all images to default; bound - use as max size but keep aspect (e.g. for thumbnails); or none: return actual size

    my($id_cmd)=&location("identify");

    unless($id_cmd eq "") {
        $com="\"$id_cmd\" \"$file\" 2>$nulfile";
        @info=split / /, smog_system_direct($com);

        if ($?) {
# probably not an image then
            $hsize=$vsize=$bpp=-1;
            return;
        }

        my($file2)=$file;
        $space_count=($file2 =~ tr/ //);
        for ($i=0; $i<$space_count; $i++) {
        shift(@info);
        }
        $bppstr=$info[4];
                @bpp=split /-/,$bppstr;
                $bpp=$bpp[0];
                @sizestr=split /\+/,$info[2];
                @size=split /x/,$sizestr[0];

                $hsize=$size[0];
                $vsize=$size[1];


        if ($imresact eq "bound") {
        if ($hsize>$dwidth) {
                $shrink=$hsize/$dwidth;
                $hsize/=$shrink;
                $vsize/=$shrink;
            }
            if ($vsize>$dheight) {
                $shrink=$vsize/$dheight;
                $hsize/=$shrink;
                $vsize/=$shrink;
            }
            $hsize=int($hsize);
            $vsize=int($vsize);
        }
        elsif($imresact eq "default") {
            $hsize=$vsize="";
        }
    }
    if (!defined($hsize)||$hsize eq "") {
        $hsize=$dwidth;
    }
    if (!defined($vsize)||$vsize eq "") {
        $vsize=$dheight;
    }
}



sub fill_and_redo_frames {
# resample and fill gaps in frames

    my $next=0;

    smog_chdir("$curtmpdir");


    for ($i=1; $i<=$end; $i++) {
        $name=&mkname($i);

        if ($next<$i&&$next>-1) {
            $last=$next;
            $next=&get_next_frame;
            return if $panic;
    }
    if ($last>0&&($i-$last)<($next-$i)) {
            $fromname=&mkname($last);
        } else {
            $fromname=&mkname($next);
        }

        unless($fromname eq $name) {
            smog_copy("$curtmpdir/$fromname$img_ext","$curtmpdir/$name$img_ext");
            return if $panic;
    }
    &sig_progress($i);
    }

}


sub get_next_frame {
    my $j;
    my $xname;
    $imresact="none";

    for ($j=$i; $j<=$end; $j++) {
        $xname=&mkname($j);
        if (-f "$xname$img_ext") {
# found next frame, resize it
            &get_image_size("$xname$img_ext");
            return if ($panic||$hsize==-1);

            if ($hsize<$width||$vsize<$height) {
                $com="$smog_convert_command -resize $width" . "x" . $height .
                "\\!+0\\!+0\\! $img_prefix_prefix\"$xname$img_ext\" $img_prefix\"$xname.mgk\" >$nulfile 2>&1";
            } else {
                $com="$smog_convert_command -crop $width" . "x" . $height . "\\! $img_prefix\"$xname$img_ext\" $img_prefix\"$xname.mgk\" >$nulfile 2>&1";
            }
            $smerr=smog_system($com);
            if ($smerr) {
                sig_system_error("$com",$smerr);
                $panic=1;
                return;
            }
            smog_rename("$xname.mgk","$xname$img_ext");
            return $j;
        }
    }
# no next frame found
    return -1;
}




sub mp3_open {
    if (-f $audio_in) {
        unlink "$audio_in";
    }
    $f_size=0;

# prefer mpg321 if it's available
    unless (&location("mpg321") eq "") {
        smog_system("mpg321 -w \"$audio_in\" --rate 44100 --stereo \"$file\" >$nulfile 2>&1");
        $f_size=-s $audio_in;
    }
    if ($f_size==0) {
        unless (&location("mpg123") eq "") {
            smog_system("mpg123 -w \"$audio_in\" --rate 44100 --stereo \"$file\" >$nulfile 2>&1");
            $f_size=-s $audio_in;
        }
    }
    if ($f_size==0) {
        &othera_open;
        return;
    }

    $file=$audio_in;
    $is_audio=1;

    &get_file_info;
    return if $panic;

$asigned=$signed;
$aendian=$endian;

if ($arate==0&&$achans==0&&$asamps==0) {
# TODO - find way to read these
# have to assume these for now
        $arate=44100;
        $achans=2;
        $asamps=16;

        $asigned=1;
        if ($asamps==8) {
            $asigned=0;
        }
        $aendian=&get_endian;
    }

    if ($f_size==0) {
        $f_size= -s $audio_in;
    }

}


sub ogg_open {
    $f_size=0;

    if (-f $audio_in) {
        unlink "$audio_in";
    }

    unless (&location("ogg123") eq "") {
        smog_system("ogg123 -d wav -f \"$audio_in\" \"$file\" >$nulfile 2>&1");
        $f_size= -s $audio_in;
    }

    if ($f_size==0) {
        &othera_open;
        return;
    }


    $file=$audio_in;
    $is_audio=1;

    &get_file_info;
    return if $panic;

$asigned=$signed;
$aendian=$endian;

if ($arate==0&&$achans==0&&$asamps==0) {
# TODO - find way to read these
# have to assume these for now
        $arate=44100;
        $achans=2;
        $asamps=16;

        $asigned=1;
        if ($asamps==8) {
            $asigned=0;
        }
        $aendian=&get_endian;
    }

    if ($f_size==0) {
        $f_size= -s $audio_in;
    }

}


sub wav_open {
    $curtmpfile=$curtmpdir . "/.temp";

    if (-f $audio_in) {
        unlink "$audio_in";
    }

    smog_copy("$file","$audio_in");
    return if $panic;

$file=$audio_in;
$is_audio=1;

&get_file_info;
return if $panic;

$asigned=$signed;
$aendian=$endian;

if ($arate==0&&$achans==0&&$asamps==0) {
# TODO - find way to read these
# have to assume these for now
        $arate=44100;
        $achans=2;
        $asamps=16;

        $asigned=1;
        if ($asamps==8) {
            $asigned=0;
        }
        $aendian=&get_endian;
    }

    if ($f_size==0) {
        $f_size= -s $audio_in;
    }
}



sub othera_open {
    $arate=44100;
    $achans=2;
    $asamps=16;
    $aendian=&get_endian;
    $asigned=1;
    $format=&get_mplayer_format;

    $com=&rc_get("video_open_command") . " -quiet \"$file\" -ao pcm:waveheader:file=\"$audio_in\" $format >$nulfile 2>&1 <$nulfile";

    $smerr=smog_system($com);

    if ($smerr) {
        sig_system_error("$com",$smerr);
        $panic=1;
        return;
    }


    $file=$audio_in;
    $is_audio=1;

    &get_file_info;
    return if $panic;

$asigned=$signed;
$aendian=$endian;

if ($arate==0&&$achans==0&&$asamps==0) {
# TODO - find way to read these
# have to assume these for now
        $arate=44100;
        $achans=2;
        $asamps=16;

        $asigned=1;
        if ($asamps==8) {
            $asigned=0;
        }
        $aendian=&get_endian;
    }

    if ($f_size==0) {
        $f_size= -s $audio_in;
    }

}



################################################
# utility subroutines

sub get_current_date {
    ($Second, $Minute, $Hour, $Day, $Month, $Year, $WeekDay, $DayOfYear, $IsDST) = localtime(time);
    my $RealMonth = $Month + 1; # Months of the year are not zero-based

    if($RealMonth < 10)
    {
        $RealMonth = "0" . $RealMonth; # add a leading zero to one-digit months
    }
    if($Day < 10)
    {
        $Day = "0" . $Day; # add a leading zero to one-digit days
    }

    $Fixed_Year = $Year + 1900;

    return $Fixed_Year."-".$RealMonth."-".$Day;
}




sub getint {
# get an int from a file in $endian format
    my ($string)=shift;
    my (@val)=unpack("CCCC",$string); #unpack $string to 4 chars in @val array

# TODO - this needs checking !

    if (!defined($endian)||$endian==1) {
#little endian
        return ((($val[3]*256+$val[2])*256+$val[1])*256)+$val[0];
    }
    else {
        return ((($val[0]*256+$val[1])*256+$val[2])*256)+$val[3];
    }
}


sub get_endian {
# 0 == big-endian
# 1 == little-endian
    return unpack("h*", pack("s", 1)) =~ /^1/;
}



sub get_mplayer_format {
    if (!defined($nrate)) {
        $nrate=$arate;
    }
    if (!defined($nchans)) {
        $nchans=$achans;
    }
    if (!defined($nasamps)) {
        $nasamps=$asamps;
    }
    if (!defined($asigned)) {
        $asigned=$signed;
    }
    if (!defined($aendian)) {
        $aendian=$endian;
    }
    if (!defined($nsigned)) {
        $nsigned=$asigned;
    }
    if (!defined($nendian)) {
        $nendian=$aendian;
    }

    if ($nasamps==8) {
        if ($nsigned==0) {
            return "-format u8";
        }
        return "-format s8";
    }
    if ($nsigned==0) {
        if ($nendian==0) {
            return "-format u16be";
        }
        return "-format u16le";
    }
    if ($nendian==0) {
        return "-format s16be";
    }
    return "-format s16le";
}




sub clean_old {
# clear away any old backup files, etc.
    return if (! -d "$tmpdir/$handle");
    smog_chdir("$tmpdir/$handle");
    unlink glob "*.mgk *.bak *.pre *.tmp pause audio.* audiodump* audioclip";
    smog_system_sync();
}



sub sig_complete {

    return if (! -d "$curtmpdir");
    my($status)="completed";
    foreach (@_) {
        $status.="|".$_;
    }

    smog_system_sync();

    if (-d $curtmpdir) {
        open OUT,">","$statusfile";
        print OUT "$status";
        close OUT;
        unlink "$pidfile";
    }
}


sub sig_killed {
    return if (! -d "$curtmpdir");
    return if (-f "$statusfile");
    my($status)="killed";

    open OUT,"> $statusfile";
    print OUT "$status";
    close OUT;
    unlink "$pidfile";
}



sub sig_complete_audio {
    return if (! -d "$curtmpdir");
    my($status)="audio_ended|";
    foreach (@_) {
        $status.="|".$_;
    }

    open OUT,"> $statusfile.play";
# autoflush output
    select((select(OUT), $| = 1)[0]);
    print OUT $status;
    close OUT;

    unless ($opening_preview==1) {
        unlink "$pidfile";
    }
}


sub sig_error {
# WARNING: error strings MUST NOT contain newlines, instead you can pass up to 4 lines of text as params

# write to backend -> frontend $statusfile

    return if (! -d $curtmpdir);

    my($status)="error";
    my ($count)=0;
    foreach (@_) {
        $status.="|".$_;
        $count++;
    }
    if ($count<4) {
        $status.="|||ERROR|";
    }

    open OUT,"> $statusfile";
    print OUT $status;
    close OUT;
    unlink "$pidfile";

    smog_system_sync();
    exit 1;
}



sub sig_write_error {
# got an error writing to a file. pass in filename as 1st param

# write to backend -> frontend $statusfile

# in params: 1 - filename, 2 - optional additional info (1 line)

    return 1 if (! -d $curtmpdir);

    my ($smfile,$smaddinfo)=@_;
    my ($smstatus)="error|write|$smfile";

    if ($smaddinfo ne "") {
        $smstatus.="|$smaddinfo";
    }

    open OUT,"> $statusfile";
    print OUT $smstatus;
    close OUT;
    return 1;
}


sub sig_read_error {
# got an error reading from a file. pass in filename as 1st param

# write to backend -> frontend $statusfile

# in params: 1 - filename, 2 - optional additional info (1 line)

    return 1 if (! -d $curtmpdir);
    my ($smfile,$smaddinfo)=@_;
    my ($smstatus)="error|read|$smfile";

    if ($smaddinfo ne "") {
        $smstatus.="|$smaddinfo";
    }

    open OUT,"> $statusfile";
    print OUT $smstatus;
    close OUT;
    return 1;
}


sub sig_system_error {
# got an error running a system command. pass in command as 1st param
# error code is second param
# use only for commands that really really must never fail

# preference is to use read/write errors as this is clearer to the user what failed

# write to backend -> frontend $statusfile

#
# in params: 1 - command which failed or description of command, 2 - error value returned, 
# 3 - optional additional info (1 line)

    return 1 if (! -d $curtmpdir);

    my ($smcom,$smerrno,$smaddinfo)=@_;
    my ($smstatus)="error|system|$smcom|$smerrno";

    if ($smaddinfo ne "") {
        $smstatus.="|$smaddinfo";
    }

    open OUT,"> $statusfile";
    print OUT $smstatus;
    close OUT;
    return 1;
}




sub sig_pid {
# write our pid in case we need to be cancelled
    open OUT,"> $pidfile";
    print OUT $$;   # process ID
    close OUT;
}



sub sig_progress {
# report progress of frame processing
###
###
# write to backend -> frontend $statusfile
    my $status="";
    foreach (@_) {
        if ($status eq "") {
            $status=$_;
        }
        else {
            $status.="|".$_;
        }
    }
    &check_for_pause;
    open OUT,"> $statusfile";
    print OUT $status;
    close OUT;
}


sub sig_clear {
    &check_for_pause;
    unlink "$statusfile";
}



sub location {
# return the location of an executable
    my ($command)=shift;

    if ($^O eq "MSWin32") {
        return "$command.exe";
    }

    my ($location)=smog_system_direct("which \"$command\" 2>$nulfile");
    chomp($location);

    $location;
}


sub get_mplayer_location {
    $mpc=&location("mplayer");
    if ($mpc eq "") {
        $mpc=&location("mplayer2");
    }
    if (defined $ALLOW_MPV) {
        if ($mpc eq "") {
## experimental
            $mpc=&location("mpv");
        }
    }
    return $mpc;
}

sub rc_set_if_not_set {
    my ($key,$value)=@_;
    $skip_if_exist=1;
    &rc_set("$key","$value");
}

sub rc_delete {
    my ($key)=$_[0];

    $delpref=1;
    &rc_set($key,"");
}



sub rc_set {
# set/modify/delete a value in the .rc file
    my ($key,$value)=@_;

    my ($rcfile)=$home."/".$rc_filename;

    if (defined($prefs_file)) {
        $rcfile=$prefs_file;
    }

    if (!defined(open OUT,"> $rcfile.new") && -e $rcfile) {
        exit 3;
    }

    if (substr($value,-1,1) eq "\"" && substr($value,0,1) ne "\"") {
        $value=substr($value,0,length($value)-1);
    }

# autoflush output
    select((select(OUT), $| = 1)[0]);

    if (! defined ($delpref)) {
        $delpref=0;
    }

    if ($key eq "") {
        $date=&get_current_date;
        print OUT "# This file is autogenerated by $GUI_NAME on $date\n";
        print OUT "# You are strongly advised to change the values only through the GUI.\n";
    }

#replace <$key> to </$key> with our new value
    else {
        if (!defined(open IN,"$rcfile") && -e $rcfile) {
            exit 2;
        }
        my $string="";
        my $current="";
        my $part=0;
        my $found=0;
        while (<IN>) {
            my $laststring=$current;
            $current=$_;
            if ($delpref!=1) {
                $string=$current;

                if ($string=~/^#.*/) {
#ignore comments
                    print OUT $string;
                    next;
                }
            }
            else {
                $string=$laststring;
                next if ($laststring eq "");
            }

            if ($priority==2) {
                print OUT "\n<$key>\n$value\n</$key>\n";
                $found=1;
                $priority=1;
            }
            if ($found==0||$part==1) {
                if ($part==1||$current=~ /^(<$key>)/) {
                    if ($skip_if_exist==1) {
                        close IN;
                        close OUT;
                        unlink "$rcfile.new";
                        $skip_if_exist=0;
                        return;
                    }
                    if ($part==0) {
                        $part=1;
                        if ($delpref==0) {
#update existing value
                            print OUT "<$key>\n$value\n</$key>\n";
                        }
                        else {
#delete
#$date=&get_current_date;
#print OUT "# $key deleted by $GUI_NAME $date\n";
                            if ($string ne "\n") {
                                print OUT $string;
                            }
                            $delpref=2;
                        }
                        $found=1;
                    }
                    if ($current=~ /(<\/$key>)$/) {
                        $part=0;
                    }
                }
                elsif ($part==0) {
                    print OUT $string;
                }
            }
            else {
                print OUT $string;
            }
        }
        if ($found==0&&$delpref==0) {
            if ($priority==1) {
                $priority=2;
                &rc_set("$key","$value");
            }
            else {
                print OUT "\n<$key>\n$value\n</$key>\n";
            }
        }
        if ($delpref==1) {
            print OUT $current;
        }
    }
    close IN;
    close OUT;
    smog_rename( "$rcfile.new","$rcfile") or exit 3;
    $delpref=0;
}


sub rc_get {
# return a value from our .rc file
    my ($key)=shift;
    my $rcfile="$home/$rc_filename";
    my $string="";

    if (defined($prefs_file)) {
        $rcfile=$prefs_file;
    }

    unless (defined(open IN,"$rcfile")) {
        print STDERR "Smogrify: Unable to read value $key from rc file, $rcfile\n";
        exit 2;
    }
    $part=0;
    while (<IN>) {
        if ($part==1&&$_=~ /(<\/$key>)$/) {
            close IN;
            return $string;
        }
        if ($part==1||$_=~ /^(<$key>)/) {
            if ($part==1) {
                $_=~ s/\n//g;
                if ($string eq "") {
                    $string=$_;
                }
                else {
                    $string.="\n".$_;
                }
            }
            else {
                $part=1;
                $string=$2;
            }
        }
    }
    close IN;
    return $string;
}



sub fast_dd {
# copy size bytes from $fdd_in to $fdd_out - skip $skip bytes in input and $seek bytes in output
# no truncation is done
    my ($size,$skip,$seek)=@_;
    my ($smres);

    return if ($size<0);

    my $bs=4096; # block size

    my $fblocks=int($size/$bs);
    my $rbytes=$size-$fblocks*$bs;

    my $data,$i;

    my $sizecheck = -s $fdd_in;

    if ($fdd_in ne "/dev/zero" && $size + $skip > $sizecheck) {
        if ($DEBUG_SMOGRIFY) {
            print STDERR "smogrify debug - fast_dd was asked to read $size bytes at offset $skip from a $sizecheck byte file\n$fdd_in\n";
        }
        $size=$sizecheck-$skip;
        if ($skip>=$sizecheck) {
            return;
        }
    }

    if (! open FFIN,"<","$fdd_in") {
        if (-f "$fdd_in") {
            $panic=sig_read_error("$fdd_in");
        }
        return;
    }

    seek FFIN,$skip,SEEK_START or $panic=sig_read_error("$fdd_in");
    return if $panic;

if ($^O eq "MSWin32") {
        $smres=smog_system("touch.exe $fdd_out");
    }
    else {
        $smres=smog_system("touch $fdd_out");
    }
    if ($smres) {
        $panic=sig_write_error("$fdd_out");
        return;
    }

    open FFOUT,"+<","$fdd_out" or $panic=sig_write_error("$fdd_out");
    return if $panic;
seek FFOUT,$seek,SEEK_START or $panic=sig_write_error("$fdd_out");
    return if $panic;

for ($i=0;$i<$fblocks;$i++) {
        read FFIN,$data,$bs or $panic=sig_read_error("$fdd_in");
        return if $panic;
    print FFOUT $data or $panic=sig_write_error("$fdd_out");
        return if $panic;
}

while ($rbytes>0) {
        $bs/=2;
        if ($rbytes>=$bs) {
            read FFIN,$data,$bs or $panic=sig_read_error("$fdd_in");
            return if $panic;
        print FFOUT $data or $panic=sig_write_error("$fdd_out");
            return if $panic;
        $rbytes-=$bs;
    }
}

close FFOUT;
close FFIN;
}


sub count_frames {
#count number of frames using a binary search

my $count=0,$gap=1;
if (!defined $handle) {
        $handle=$ARGV[1];
        $curtmpdir="$tmpdir/$handle";
    }

    $name=&mkname(1);

    unless (-f "$curtmpdir/$name$img_ext") {
        return 0;
    }

    while (1) {
        $name=&mkname($count+$gap);
        if (-f "$curtmpdir/$name$img_ext") {
            $count+=$gap;
            $gap*=2;
        }
        else {
            if ($gap==1) {
                last;
            }
            $gap/=2;
        }
    }
    return $count;
}



sub my_basename {
    my ($exe)=shift;
    my @parts=split(/\//,$exe);
    return $parts[-1];
}



sub write_bootstrap_file {
#write our bootstrap file and make our tmpdir
    unlink "$gui_bootstrap_file";
    unless (defined(open OUT,"> $gui_bootstrap_file")) {
        exit 4;
    }
    close OUT;
}


sub mktmpdir {
    unless (-d $tmpdir) {
# create working directory
        umask 0;
        unless (mkdir $tmpdir,0777) {
            unless ($gui_bootstrap_file eq "") {
                open OUT,"> $gui_bootstrap_file" or exit 4;
                print OUT "$version#$tmpdir#$msg#$msg2";
                close OUT;
            }
            exit 5;
        }
        umask $umask;
    }
}


sub fndset {
# check if a directory is in a set (old style)
# but useful for frontend marking the currently opened clips, so we do not prune them by accident

    if ($^O eq "MSWin32") {
        /^set/ or return;
    }
    else {
        /^set\./ or return;
    }

    $in_set=1;
}



sub get_home_dir {
    return $ENV{"HOME"};
}



# get default values
sub rc_get_default {
# return a value from our .rc file
    my ($key)=shift;
    my ($ret)="";

    if ($key eq "mplayer_play_video_command") {
        $ret="\"".&get_mplayer_location."\"";
        if (!($ret eq "")) {
            $ret.=" -double";
        }
    }

    elsif ($key eq "sox_command") {
        $ret="\"".&location("play")."\"";
    }

    elsif ($key eq "mplayer_audio_command") {
        $ret="\"".&get_mplayer_location."\"";
    }

    $ret;
}


sub get_fs_type {
    my $dir = shift;
    my @res = split /\n/, smog_system_direct("df -T");

    my $xfstype = "Unknown";

    my @pieces,$mp,$mplen;
    my $maxlen = 0;

    foreach (@res) {
        @pieces = split /\s+/, $_;
        $mp=$pieces[6];
        $mplen=length($mp);
        $fstype=$pieces[1];
        if ($dir =~ /$mp/ && $mplen > $maxlen) {
            $maxlen = $mplen;
            $xfstype = $fstype;
        }
    }
    $xfstype;
}



sub version_check_and_upgrade {
# various things that should happen on update

# mainly for very very old versions


    my $old_version=&rc_get("version");
    my $version_hash=&version_hash($old_version);
    my $new_version_hash=&version_hash($version);

    $msg="";

# throw a warning if using png and convert_version < 6.0.0
    if (&rc_get("default_image_format") eq "png" && $convert_version_hash<6000 && $convert_version_hash>0) {
        $msg="You are advised to upgrade to at least version 6.0 of Image Magick if using png files";
    }

    if ($version_hash>0) {

        if ($new_version_hash>$version_hash) {
            $msg="!updmsg";
        }

        if ($version_hash<8005) {
# not used now
            &rc_delete("frontend");
            &rc_delete("mog_auto_bak");
            &rc_delete("plugin_dir");
        }
        if ($version_hash<9001) {
# convert_version is used instead now
            &rc_delete("mogrify_version");

            &rc_delete("effects_command");

# hey, now we use our own keyboard poller
# things are getting groovy !
            &rc_delete("no_fast_keys");

# changed to "open_compression_percent"
            &rc_delete("open_quality");

            &rc_delete("kbd_rpt_state");
            &rc_delete("kbd_rpt_delay");
            &rc_delete("kbd_rpt_rate");

#encoder_command not used any more
            &rc_delete("encoder_command");

#encoder_acodec used instead
            &rc_delete("audio_encode_quality");

#encoder plugin names changed
            $msg="Make sure you delete all the old encoder plugins and install the new ones.";
            $msg2="Then change your encoder from Preferences / Encoders";
        }
        if ($version_hash<9006) {
            &rc_delete("video_player");
            &rc_delete("video_play_command");
            &rc_delete("PAL/NTSC");
        }
        if ($version_hash<9006) {
            &rc_delete("osc_opts");
        }
        if ($version_hash<1001005) {
            &rc_delete("debug_encoders");
        }
        if ($version_hash<1002000) {
            my $wmask=&rc_get("lives_warning_mask");
            $wmask|=8192;
            &rc_set("lives_warning_mask",$wmask);
        }
        if ($version_hash<1003011) {
            &rc_set("osc_port",49999);
            $msg="Default OSC port has been changed to 49999.";
        }
        if ($version_hash==2002005 && &rc_get("video_open_command") eq "") {
            $video_open_command="\"".&get_mplayer_location."\"";
            &rc_set("video_open_command","$video_open_command");
        }
        unless ($old_version eq $version) {
            $current_keymap=smog_system_direct("grep \"keymap file version 4\" \"$lives_home_dir/$default_keymap\" 2>$nulfile");
            if ($current_keymap eq "") {
                unlink "$lives_home_dir/$default_keymap";
            }
            unless (&location("build-lives-plugin-multi") eq "") {
                smog_system("build-lives-plugin-multi custom");
                smog_system("build-lives-plugin-multi test");
            }
        }
    }


# bless this version
    &rc_set("version","$version");
}


sub version_hash {
# turn a version like
# a.b.c into an integer
# a * 1,000,000 plus b * 1,000 plus c
# eg. 1.4.6 becomes 10004006

    my ($string)=shift;
    if ($string eq "") {
        return 0;
    }
    my ($ver_major,$ver_minor,$ver_micro)=split (/[.]/, $string,3);
    my $version_hash=($ver_major*1000+$ver_minor)*1000+$ver_micro;
    $version_hash;
}


sub RGB24_to_string {
# convert input like 255,255,255 to #FFFFFF

    my ($red,$green,$blue)=@_;
    sprintf("\"#%02X%02X%02XFF\"",int($red),int($green),int($blue));
}


sub get_form_request {
# get format request from a (encoder) plugin
# part of the encoding process
    my ($plugin)=shift;
    if ($plugin eq "") {
        return &get_format_request;
    }
    else {

        if ($^O eq "MSWin32") {
# filter by file ext
            my $ext=&get_ext("$plugin");
            if ($ext eq ".py") {
                $cmd="python";
            }
            else {
                $cmd="perl";
            }
            return smog_system_direct("$cmd \"$plugin\" get_format_request");
        }
        return smog_system_direct("\"$plugin\" get_format_request");
    }
}


sub get_convert_version_hash {
# turn a version like
# a.b.c into an integer
# a * 1,000,000 plus b * 1,000 plus c
# eg. 1.4.6 becomes 10004006

    my $real_convert_command=(split(" ",$smog_convert_command))[0];
    my $convert_version=smog_system_direct("$real_convert_command | grep -i version");
    $convert_version=(split(" ",$convert_version))[2];
    return &version_hash($convert_version);
}


sub weed {
# here is where we clear up diskspace

    my $opts=shift;

# opts: - if unset bit 0 (1)    delete clips not in any set and not marked as "in-use" (protected with set.* file)
#         if unset bit 1 (2)    prune (clean up) any non "in-use" clips (remove backup files etc.) (prot. w. noprune)
#	      if set   bit 2 (4)    remove any sets (directories) with layouts but no clips (subdirectories)
#         if unset bit 3 (8)    remove marker files
#         if unset bit 4 (16)   remove misc. files
#        

#

    my $file;
    smog_chdir("$tmpdir");

# get starting disk space
    my $start_total=(split / /, (smog_system_direct("du -sb 2>$nulfile")))[0];

    use File::Find;
    opendir DIR,$tmpdir;
    while ($file=readdir(DIR)) {
        unless ($file =~ /^\./) {

            if (-d "$tmpdir/$file") {
# remove a set unlesss it has clips OR (layouts AND NOT (opts & 0x04))
                if (&is_non_empty_dir("$tmpdir/$file/clips") || (&is_non_empty_dir("$tmpdir/$file/layouts") && !($opts & 0x04))) {
# new style sets, check clips and optionally layouts
                    unless (!defined($new_temp)||$new_temp eq "") {
# we are to move this set
                        if (-d "$new_temp/$file") {
                            smog_rename( "$new_temp/$file","$new_temp/$file.bak");
                        }
                        unless ($opts & 0x02) {
                            unless (-f "$tmpdir/$file/noprune") {
                                smog_chdir("$tmpdir/$file");
                                &prune;
                                smog_chdir("$tmpdir");
                            }
                        }
                        smog_rename( "$tmpdir/$file","$new_temp/$file");
                    }
                }
                else {


# dir is of no interest
                    $in_set=0;
                    find (\&fndset,"$tmpdir/$file/");
                    if (!$in_set && !($opts & 0x01)) {
                        if ($^O eq "MSWin32") {
                            if (chdir("$tmpdir/$file")) {
                                unlink glob "* *.* .*";
                                smog_chdir("$tmpdir");
                                rmdir "$tmpdir/$file";
                            }

                        }
                        else {
                            smog_system("/bin/rm -rf \"$tmpdir/$file\"");
                        }
                    }
                    else {
                        unless ($opts & 0x02) {
                            unless (-f "$tmpdir/$file/noprune") {
                                smog_chdir("$tmpdir/$file");
                                &prune;
                                smog_chdir("$tmpdir");
                            }
                        }
                        unless (!defined($new_temp)||$new_temp eq "") {
# tempdir was changed, so we move all sets (subdirs) from old tempdir to new 
# [TODO - check for set name collision !]
                            if (-d "$tmpdir/$file") {
                                if (-d "$new_temp/$file") {
                                    smog_rename( "$new_temp/$file","$new_temp/$file.bak");
                                }
                                smog_rename( "$tmpdir/$file","$new_temp/$file");
                            }
                        }
                    }
                }
                unless ($opts & 0x08) {
                    unlink "$tmpdir/$file/set.";
                    unlink "$tmpdir/$file/noprune";
                }
            }
            else {
# move crash recovery files
                unless (!defined($new_temp)||$new_temp eq "") {
                    if ($file =~ /^recovery/ || $file =~ /^layout/) {
                        smog_rename( "$tmpdir/$file","$new_temp/$file");
                    }
                }
            }
        }
    }

    closedir DIR;

    unless ($opts & 0x10) {
# clean up a few extra remnants
        smog_chdir("$tmpdir");
        unlink glob ".* rfx.* smogplugin.*";
        if ($^O ne "MSWin32") {
            unlink glob "/tmp/.smogval* /tmp/lives-symlinks";
        }
        unless (!defined($new_temp)||$new_temp eq "") {
            unlink glob "firew.* encoder_log_* stream.*";
        }
    }

# total disk space at end
    my $end_total=(split / /, (smog_system_direct("du -sb")))[0];

# return disk space gained (in bytes)
    return $start_total-$end_total;
}


sub get_sox_version {
#try to get version of sox

# parse a line like "sox: SoX v14.3.2"
# which would return 14.3.2
# (take third word and strip leading v)

# final value would be 140003002

    my $soxv=smog_system_direct("sox -h 2>&1 | grep -i sox:");

    my @soxvvz=split(/\./,(split(" ",$soxv))[2]);
    my $soxvv=$soxvvz[0];

    if (substr($soxvv,0,1) eq "v") {
        $soxvv=substr($soxvv,1,length($soxvv));
    }
    if ($soxvv eq "") {
# version 12.x.x or lower
        $soxvv=0;
    }
    else {
        $soxvv = $soxvv * 1000000 + $soxvvz[1] * 1000 + $soxvvz[2];
    }

    return $soxvv;
}


sub prune {
# clean up old backup images etc in $tmpdir/$file
# part of the diskspace recovery process

    $old_handle=$handle;
    $handle=$file;
    &clean_old;
    $handle=$old_handle;
}




sub clear_symlinks {
# clear symlinks directory - called after encoding a selection (part of a clip which gets symlinked)

# this is for "safe" symlinks
# we say that symlinks may be created only within /tmp/lives-symlinks on whatever system

# this allows e.g dynebolic to use non-Linux disk as working directory


    my $linksdir="lives-symlinks/$handle/";

    smog_chdir("/tmp");

    if (-d $linksdir) {
# remove directory + contents
        if ($^O eq "MSWin32") {
            smog_system("DEL /q \"$linksdir\"");
            smog_system("RMDIR \"$linksdir\"");
        }
        else {
            smog_system("/bin/rm -rf \"$linksdir\"");
        }
    }

#create dir so next step works
    if ($^O eq "MSWin32") {
        smog_system("mkdir.exe /p \"$linksdir\"");
    }
    else {
        make_path("$linksdir");
    }

# remove dir + any empty parents
    if ($^O eq "MSWin32") {
        smog_system("rmdir.exe /p \"$linksdir\" 2>$nulfile");
    }
    else {
        smog_system("/bin/rmdir -p \"$linksdir\" 2>$nulfile");
    }
}


sub is_non_empty_dir {
#return 1 if "the parameter" is the name of a directory containing at least one non-dotted file

#uses opendir and readdir


    my $dirname=shift;
    my $xfile;

    opendir TDIR,$dirname;
    while ($xfile=readdir(TDIR)) {
        unless ($xfile =~ /^\./) {
            closedir TDIR;
            return 1;
        }
    }

    closedir TDIR;
    return 0;
}
