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#!/usr/bin/perl |
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|
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# |
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# capture a steady stream of video frames, compress it and split it into |
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# multiple files, for long recording sessions |
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# |
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# configure it below |
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# |
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|
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use Socket; |
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use Fcntl; |
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|
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use Video::Capture::V4l; |
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use Video::RTjpeg; |
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use Time::HiRes 'time'; |
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|
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use File::Sync 'sync'; |
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|
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use IPC::SysV; |
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use POSIX qw(nice WNOHANG); |
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use IO::Select; |
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|
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BEGIN { require "linux-dsp-ioctl.ph" } |
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|
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$|=1; |
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|
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my $outprefix = "/tmp/vstream"; |
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|
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my $initial_fadein = 40; # initial settle time |
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my $consec = 25; # push this many frames to each encoder |
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my $syncfreq = 0.2; # pause this time between syncs |
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my $vencoders = 8; # number of encoder processes |
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my(@venc,@enc); |
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|
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#my ($w, $h, $vformat) = (704, 528, PALETTE_YUV420P); |
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|
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my ($cw, $ch, $vformat) = (576, 432, PALETTE_YUV420P); |
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my ($cl, $cr, $ct, $cb) = (16,16, 16,16); |
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|
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#my ($cw, $ch, $vformat) = (320, 240, PALETTE_YUV420P); |
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#my ($cl, $cr, $ct, $cb) = (0,0, 0,0); |
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|
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my $fps = 25; |
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my $spf = 1/$fps; |
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|
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my ($x, $y, $w, $h) = ($cl, $ct, $cw-$cr-$cl, $ch-$cb-$ct); |
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|
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my ($rate, $channels, $aformat) = (44100, 2, &AFMT_S16_LE); |
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my ($Q, $M) = (255, 0); |
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my $fsize = $cw*$ch*2; |
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|
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my $buffers = int(32*1024*1024/$fsize); |
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my $bufsize = $fsize * $buffers; |
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|
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my $shm = shmget IPC_PRIVATE, $bufsize, IPC_CREAT|0600; |
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$shm or die "unable to allocate $bufsize shm segment"; |
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END { shmctl $shm, IPC_RMID, 0 } |
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$SIG{INT} = sub { exit }; |
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|
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my @buffers = (0..($buffers-1)); |
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|
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my $select = IO::Select->new(); |
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my %cb; |
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|
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# audio setup |
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|
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sysopen DSP, "/dev/dsp", O_RDONLY |
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or sysopen DSP, "/dev/dsp", O_RDONLY |
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or die "unable to open /dev/dsp for reading: $!"; |
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|
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ioctl DSP, SNDCTL_DSP_SETFRAGMENT, pack "i", 0x7fff000e or die "SNDCTL_DSP_SETFRAGMENT: $!"; |
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ioctl DSP, SNDCTL_DSP_SETFMT, pack "i", $aformat or die "SNDCTL_DSP_SETFMT: $!"; |
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ioctl DSP, SNDCTL_DSP_CHANNELS, pack "i", $channels or die "SNDCTL_DSP_CHANNELS: $!"; |
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ioctl DSP, SNDCTL_DSP_SPEED, pack "i", $rate or die "SNDCTL_DSP_SPEED: $!"; |
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|
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open AUDIO, ">$outprefix.a" or die; |
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|
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# video setup |
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|
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$grab = new Video::Capture::V4l |
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or die "Unable to open Videodevice: $!"; |
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|
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my $channel = $grab->channel (0); |
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my $tuner = $grab->tuner (0); |
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$tuner->mode(MODE_PAL); |
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$channel->norm(MODE_PAL); |
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$tuner->mode(8); |
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$tuner->set; |
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$channel->set; |
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|
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#$CHANNEL69 = 855250; |
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#print $grab->freq ($CHANNEL69),"\n"; |
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|
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sub new_vencoder { |
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my $number = @enc; |
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my $encp = do { local *ENCODER_WRITER }; |
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my $encc = do { local *ENCODER_READER }; |
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socketpair $encc, $encp, AF_UNIX, SOCK_STREAM, PF_UNSPEC; |
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$select->add($encp); |
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$cb[fileno $encp] = sub { |
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my $buf; |
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4 == sysread $encp, $buf, 4 or die "unable to read bufferid"; |
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$buf = unpack "N", $buf; |
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push @buffers, $buf; |
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}; |
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if (0 == fork) { |
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open DATA, ">$outprefix.v$number" or die "$!"; |
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|
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my $tables = Video::RTjpeg::init_compress($cw,$ch,$Q); |
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Video::RTjpeg::init_mcompress(); |
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|
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syswrite DATA, pack "N", length($tables); |
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syswrite DATA, $tables; |
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|
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my $buf; |
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my $count = $number * 313; |
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for(;;) { |
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8 == read $encc, $buf, 8 or die "incomplete frame time read: $!"; |
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my ($buffer, $time) = unpack "NN", $buf; |
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last if $buffer >= $buffers; |
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shmread $shm, $buf, $buffer*$fsize, $fsize; |
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syswrite $encc, (pack "N", $buffer); |
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my $fr = Video::RTjpeg::mcompress($buf,$M,$M>>1, $x, $y, $w, $h); |
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#my $fr = Video::RTjpeg::compress($buf); |
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syswrite DATA, pack "NN", $time, length $fr; |
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syswrite DATA, $fr; |
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|
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#Video::RTjpeg::fdatasync fileno DATA if ($count++ & 63) == 0; |
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print "+"; |
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} |
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print "X"; |
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exit; |
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} |
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push @enc, $encp; |
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} |
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|
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new_vencoder for 1..$vencoders; |
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|
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@venc = map (($_)x$consec, @enc); |
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|
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my $frame = 0; |
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my $frames = 0; |
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my $dropped = 0; |
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|
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sub put_vframe { |
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my $buffer = pop @buffers; |
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my $enc = pop @venc; |
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unshift @venc, $enc; |
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if (defined $buffer) { |
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print "-"; |
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shmwrite $shm, ${$_[1]}, $buffer*$fsize, $fsize; |
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syswrite $enc, (pack "NN", $buffer, $_[0]); |
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} else { |
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print "o"; |
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$dropped++; |
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} |
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} |
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|
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my $syncpid = fork; |
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if ($syncpid==0) { |
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for(;;) { |
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select undef, undef, undef, $syncfreq; |
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print "S"; |
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sync; |
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} |
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Video::RTjpeg::_exit; |
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}; |
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|
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system "rtprio -p $$"; |
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|
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my $fr = \$grab->capture ($frame, $cw, $ch, $vformat); |
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for(1..$initial_fadein) { |
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my $nfr = \$grab->capture (1-$frame, $cw, $ch, $vformat); |
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$grab->sync($frame) or die "unable to sync"; |
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$frame = 1-$frame; |
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$fr = $nfr; |
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} |
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|
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my $start = time; |
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my $nframe; |
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|
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$fr = \$grab->capture ($frame, $cw, $ch, $vformat); |
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|
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my $audpid = fork; |
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if ($audpid==0) { |
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my $count = 0; |
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my $in = ""; vec($in, fileno DSP, 1) = 1; |
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fcntl DSP, F_SETFL, O_NONBLOCK; |
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ioctl DSP, SNDCTL_DSP_SETTRIGGER, pack "i", 0; |
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ioctl DSP, SNDCTL_DSP_SETTRIGGER, pack "i", PCM_ENABLE_INPUT; |
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for(;;) { |
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my $buf; |
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select my $xin = $in, undef, undef, $spf*2; |
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print "."; |
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if (0 < sysread DSP, $buf, 128*1024) { |
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#print length $buf; |
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syswrite AUDIO, $buf; |
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} |
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} |
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Video::RTjpeg::_exit; |
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}; |
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|
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my $do_capture = 1; |
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$select->add(*STDIN); |
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$cb[fileno STDIN] = sub { |
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$do_capture = 0; |
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}; |
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|
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while($do_capture) { |
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printf "\n%02d:%02d +%2d %2ds %dd > ", |
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int($nframe*$spf/60), int($nframe*$spf)%60, |
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scalar@buffers, $frames-$nframe, $dropped |
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if $frames % $fps == 0; |
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|
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my $nfr = \$grab->capture (1-$frame, $cw, $ch, $vformat); |
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$grab->sync($frame) or die "unable to sync"; |
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|
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my $now = time; |
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$nframe = int (($now-$start) / $spf + 0.5); |
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$start = $now - $nframe * $spf; |
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|
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put_vframe($nframe, $fr); |
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|
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for ($select->can_read(0)) { |
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$cb[fileno $_]->(); |
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} |
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|
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$frame = 1-$frame; |
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$frames++; |
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$fr = $nfr; |
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} |
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|
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open CTRL, ">$outprefix" or die; |
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print CTRL <<EOF; |
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\$outprefix = "$outprefix"; |
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|
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\$fps = $fps; |
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\$spf = $spf; |
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|
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\$frames = $frames; |
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\$nframe = $nframe; |
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\$dropped = $dropped; |
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\$vencoders = $vencoders; |
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\$rate = $rate; |
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\$channels = $channels; |
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\$aformat = $aformat; |
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\$w = $w; |
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\$h = $h; |
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|
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\$buffers = $buffers; |
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\$fsize = $fsize; |
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|
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1; |
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EOF |
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close CTRL; |
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|
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$select->remove(*STDIN); |
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|
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close DSP; |
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close AUDIO; |
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kill 'TERM', $syncpid; |
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kill 'TERM', $audpid; |
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|
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for (@enc) { |
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syswrite $_, (pack "NN", -1, -1); |
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$select->remove($_); |
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} |
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|
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for(;;) { |
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for ($select->can_read(0)) { |
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$cb[fileno $_]->(); |
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} |
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} |
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|
