575 lines
14 KiB
Perl
Executable File
575 lines
14 KiB
Perl
Executable File
#!/usr/bin/env perl
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#
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# $Id$
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#
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# -*- perl -*-
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#
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# ----------------------------------------------------------------------
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# Server side media format conversion script for mt-daapd.
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# ----------------------------------------------------------------------
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# Copyright & 2005
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# Timo J. Rinne <tri@iki.fi>
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# ----------------------------------------------------------------------
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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#
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# This is quite rudimentary but handles most cases quite well.
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#
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# TODO-list:
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# - Make the guessing of the wav length reliable.
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# - Possibly implement some kind of caching.
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#
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# I'll probably never have time for above things, but now it should
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# be easy for someone to take this over, since basically all you have
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# to do is to make the filter program and tweak the configuration.
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#
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# //tri
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#
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require 'sys/syscall.ph';
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use POSIX ":sys_wait_h";
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use IO::Handle;
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use IO::File;
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use IPC::Open2;
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use IPC::Open3;
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$SIG{PIPE} = 'IGNORE';
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{
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umask(0077);
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if ($#ARGV < 1) {
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usage();
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}
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my ($fn) = $ARGV[0];
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my ($off) = 0 + $ARGV[1];
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my ($forgelen) = undef;
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if ($#ARGV > 1) {
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$forgelen = 0.0 + $ARGV[2];
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if ($forgelen < 0.01) {
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$forgelen = 0.0;
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}
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} else {
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$forgelen = 0.0;
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}
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if ($off < 0) {
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usage();
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}
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if ($fn =~ m/^..*\.wav$/i) {
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passthru_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.wave$/i) {
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passthru_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.flac$/i) {
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flac_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.fla$/i) {
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flac_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.mp4$/i) {
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mpeg4_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.m4a$/i) {
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mpeg4_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.m4p$/i) {
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mpeg4_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.aac$/i) {
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mpeg4_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.shn$/i) {
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ffmpeg_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.mp3$/i) {
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ffmpeg_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.mpg$/i) {
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ffmpeg_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.ogg$/i) {
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ffmpeg_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.avi$/i) {
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ffmpeg_proc($fn, $off, $forgelen);
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} elsif ($fn =~ m/^..*\.au$/i) {
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ffmpeg_proc($fn, $off, $forgelen);
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} else {
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mplayer_proc($fn, $off, $forgelen);
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}
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exit;
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}
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sub usage
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{
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print STDERR "usage: ssc-script file offset\n";
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exit -1;
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}
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sub tmp_file
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{
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my ($r) = sprintf "/tmp/t-%d.wav", $$;
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return $r;
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}
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sub wav_loop
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{
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my ($f) = shift;
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my ($off) = shift;
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my ($forgelen) = shift;
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my ($buf);
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my ($buflen);
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my ($buftry) = 4096;
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my ($hdr);
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$hdr = read_wav_hdr($f);
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if (! defined $hdr) {
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return undef;
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}
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my ($chunk_data_length,
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$format_data_length,
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$compression_code,
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$channel_count,
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$sample_rate,
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$sample_bit_length,
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$data_length) = parse_wav_hdr($hdr);
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if (! defined $chunk_data_length) {
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print STDERR "Can't parse WAV header.\n";
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return undef;
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}
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if (defined $forgelen) {
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if ($forgelen > 0.00001) {
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my ($sec) = int($forgelen);
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my ($msec) = ($forgelen - (0.0 + int($forgelen))) * 1000;
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my ($bps) = ($sample_rate * $channel_count * int(($sample_bit_length + 7) / 8));
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my ($len) = int(($sec * $bps) + (($msec * $bps) / 1000));
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my ($blocklen);
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my ($residual);
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if (($sample_rate == 44100) &&
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($channel_count == 2) &&
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($sample_bit_length == 16)) {
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# It's probably a CD track so let's round it to next cd block limit (2352 bytes).
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$blocklen = 2352;
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} else {
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# Pad it at least to next valid sample border.
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$blocklen = ($channel_count * int(($sample_bit_length + 7) / 8))
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}
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$residual = $len % $blocklen;
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if ($residual != 0) {
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my ($pad) = $blocklen - $residual;
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$len += $pad;
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}
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$hdr = forge_wav_hdr($hdr, $len);
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} else {
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$hdr = forge_continuous_wav_hdr($hdr);
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}
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}
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if (($off > 0) && ($off < length($hdr))) {
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$hdr = substr($hdr, $off, (length($hdr) - $off));
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} elsif ($off == length($hdr)) {
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$hdr = undef;
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} elsif ($off > length($hdr)) {
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$hdr = undef;
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$off -= length($hdr);
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if (! sysseek($f, $off, 1)) {
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# It's not seekable. Then just read until desired offset.
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while ($off > 0) {
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my ($rl) = $off > $buftry ? $buftry : $off;
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$buflen = sysread($f, $buf, $rl);
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if ($buflen < 1) {
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return undef;
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}
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$off -= $buflen;
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}
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}
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}
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if (defined $hdr) {
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if (syswrite (STDOUT, $hdr) != length($hdr)) {
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print STDERR "Write failed.\n";
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return undef;
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}
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}
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while (1) {
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$buflen = sysread($f, $buf, $buftry);
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if ($buflen < 1) {
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return 1;
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}
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if (syswrite (STDOUT, $buf) != $buflen) {
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print STDERR "Write failed.\n";
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return undef;
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}
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}
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}
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sub read_wav_hdr
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{
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my ($f) = shift;
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my ($hdr) = undef;
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my ($format_data_length);
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if (sysread($f, $hdr, 44) != 44) {
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print STDERR "Can't read WAV header.\n";
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return undef;
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}
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return undef
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if ((substr($hdr, 0, 4) ne "RIFF"));
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return undef
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if ((substr($hdr, 8, 4) ne "WAVE"));
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return undef
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if ((substr($hdr, 12, 4) ne "fmt "));
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$format_data_length = (((((((ord(substr($hdr, 19, 1))) * 256) +
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(ord(substr($hdr, 18, 1)))) * 256) +
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(ord(substr($hdr, 17, 1)))) * 256) +
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(ord(substr($hdr, 16, 1))));
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return undef
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if (($format_data_length < 16) || ($format_data_length > 256));
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if ($format_data_length > 16) {
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my ($hdr_cont);
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my ($cont_len) = $format_data_length - 16;
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if (sysread($f, $hdr_cont, $cont_len) != $cont_len) {
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print STDERR "Can't read WAV header.\n";
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return undef;
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}
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$hdr = $hdr . $hdr_cont;
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}
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# FFMpeg creates sometimes WAVs with fmt chunk longer than 16 bytes.
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# This is weird, since at least iTunes can't play them. Let's chop
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# extra bytes away from the fmt chunk and make the WAV header look
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# like everything else in the world seems to like it.
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if ($format_data_length > 16) {
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my ($chunk_data_length,
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$format_data_length,
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$compression_code,
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$channel_count,
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$sample_rate,
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$sample_bit_length,
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$data_length) = parse_wav_hdr($hdr);
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$chunk_data_length = $chunk_data_length - ($format_data_length - 16);
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$hdr = (substr($hdr, 0, 4) .
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chr($chunk_data_len % 256) .
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chr((int($chunk_data_len / 256)) % 256) .
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chr((int($chunk_data_len / (256 * 256))) % 256) .
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chr((int($chunk_data_len / (256 * 256 * 256))) % 256) .
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substr($hdr, 8, 8) .
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chr(16) .
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chr(0) .
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chr(0) .
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chr(0) .
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substr($hdr, 20, 16) .
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substr($hdr, 20 + $format_data_length, length($hdr) - (20 + $format_data_length)));
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}
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return $hdr;
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}
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sub parse_wav_hdr
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{
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my ($hdr) = shift;
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if (length($hdr) < 44) {
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return undef;
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}
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my ($chunk_data_length);
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my ($format_data_length);
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my ($compression_code);
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my ($channel_count);
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my ($sample_rate);
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my ($sample_bit_length);
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my ($data_length);
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return undef
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if ((substr($hdr, 0, 4) ne "RIFF"));
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$chunk_data_length = (((((((ord(substr($hdr, 7, 1))) * 256) +
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(ord(substr($hdr, 6, 1)))) * 256) +
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(ord(substr($hdr, 5, 1)))) * 256) +
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(ord(substr($hdr, 4, 1))));
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return undef
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if ((substr($hdr, 8, 4) ne "WAVE"));
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return undef
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if ((substr($hdr, 12, 4) ne "fmt "));
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$format_data_length = (((((((ord(substr($hdr, 19, 1))) * 256) +
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(ord(substr($hdr, 18, 1)))) * 256) +
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(ord(substr($hdr, 17, 1)))) * 256) +
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(ord(substr($hdr, 16, 1))));
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return undef
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if ($format_data_length < 16);
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$compression_code = (((ord(substr($hdr, 21, 1))) * 256) +
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(ord(substr($hdr, 20, 1))));
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return undef
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if ($compression_code != 1);
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$channel_count = (((ord(substr($hdr, 23, 1))) * 256) +
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(ord(substr($hdr, 22, 1))));
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return undef
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if ($channel_count < 1);
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$sample_rate = (((((((ord(substr($hdr, 27, 1))) * 256) +
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(ord(substr($hdr, 26, 1)))) * 256) +
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(ord(substr($hdr, 25, 1)))) * 256) +
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(ord(substr($hdr, 24, 1))));
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$sample_bit_length = (((ord(substr($hdr, 35, 1))) * 256) +
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(ord(substr($hdr, 34, 1))));
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return undef
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if ((substr($hdr, $format_data_length + 20, 4) ne "data"));
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$data_length = (((((((ord(substr($hdr, $format_data_length + 24 + 3, 1))) * 256) +
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(ord(substr($hdr, $format_data_length + 24 + 2, 1)))) * 256) +
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(ord(substr($hdr, $format_data_length + 24 + 1, 1)))) * 256) +
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(ord(substr($hdr, $format_data_length + 24 + 0, 1))));
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return ($chunk_data_length,
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$format_data_length,
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$compression_code,
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$channel_count,
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$sample_rate,
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$sample_bit_length,
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$data_length);
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}
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sub forge_wav_hdr
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{
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my ($hdr) = shift;
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my ($data_len) = shift;
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my ($chunk_data_len) = $data_len + 36;
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return (substr($hdr, 0, 4) .
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chr($chunk_data_len % 256) .
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chr((int($chunk_data_len / 256)) % 256) .
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chr((int($chunk_data_len / (256 * 256))) % 256) .
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chr((int($chunk_data_len / (256 * 256 * 256))) % 256) .
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substr($hdr, 8, length($hdr) - 8 - 4) .
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chr($data_len % 256) .
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chr((int($data_len / 256)) % 256) .
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chr((int($data_len / (256 * 256))) % 256) .
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chr((int($data_len / (256 * 256 * 256))) % 256));
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}
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sub forge_continuous_wav_hdr
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{
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my ($hdr) = shift;
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return (substr($hdr, 0, 4) .
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chr(0xff) .
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chr(0xff) .
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chr(0xff) .
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chr(0xff) .
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substr($hdr, 8, length($hdr) - 8 - 4) .
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chr(0xff - length($hdr) - 8) .
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chr(0xff) .
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chr(0xff) .
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chr(0xff));
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}
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sub passthru_proc
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{
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my ($fn) = shift;
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my ($off) = shift;
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my ($forgelen) = shift;
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my ($tf) = tmp_file();
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my ($f) = undef;
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if (! open($f, "< $fn")) {
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return undef;
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}
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wav_loop($f, $off, undef); # Ignore $forgelen
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close($f);
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}
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sub flac_proc
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{
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my ($fn) = shift;
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my ($off) = shift;
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my ($forgelen) = shift;
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my ($r) = undef;
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my ($w) = undef;
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my ($pid);
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$pid = open2($r, $w, 'flac', '--silent', '--decode', '--stdout', "$fn");
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wav_loop($r, $off, undef); # Ignore $forgelen
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close($r);
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close($w);
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if (waitpid($pid, WNOHANG) <= 0) {
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kill(SIGKILL, $pid);
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waitpid($pid, 0);
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}
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}
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sub ffmpeg_proc
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{
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my ($fn) = shift;
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my ($off) = shift;
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my ($forgelen) = shift;
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my ($r) = undef;
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my ($w) = undef;
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my ($pid);
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$pid = open2($r, $w, 'ffmpeg', '-vn', '-i', "$fn", '-f', 'wav', '-');
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wav_loop($r, $off, $forgelen);
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close($r);
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close($w);
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if (waitpid($pid, WNOHANG) <= 0) {
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kill(SIGKILL, $pid);
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waitpid($pid, 0);
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}
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}
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sub mplayer_proc
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{
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my ($fn) = shift;
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my ($off) = shift;
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my ($forgelen) = shift;
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my ($tf) = tmp_file();
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my ($w) = undef;
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my ($f) = undef;
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my ($pid);
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my ($i);
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my ($started) = undef;
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my ($waited) = undef;
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my ($ready) = undef;
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my ($prebuf) = 2 * 1024 * 1024;
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unlink($tf);
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$pid = open3('>&STDERR', $w, '>&STDERR',
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'mplayer',
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'-quiet', '-really-quiet',
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'-vo', 'null',
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'-nomouseinput', '-nojoystick', '-nolirc',
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'-noconsolecontrols', '-nortc',
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'-ao', "pcm:file=$tf", "$fn");
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# Wait just to see, if the decoding starts.
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# If the resulting wav is less than 512 bytes,
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# This will fail, but who cares.
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foreach $i (0.05, 0.1, 0.2, 0.4, 0.8, 1.6, 3.2) {
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my ($s);
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my ($wp);
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select(undef, undef, undef, $i);
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$wp = waitpid($pid, WNOHANG);
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($_, $_, $_, $_, $_, $_, $_, $s, $_, $_, $_, $_, $_) = stat("$tf");
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if (defined $s && ($s > 512)) {
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$started = 1;
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}
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if ($wp > 0) {
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$waited = 1;
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}
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if ($started || $waited) {
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last;
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}
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}
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if (! $started) {
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kill(SIGKILL, $pid);
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unlink($tf);
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}
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# Loop here until we got data beyond the offset point
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# or the process terminates.
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my ($sleep) = 0.025;
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while (! $waited) {
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my ($s);
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my ($wp);
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if ($sleep < 0.5) {
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$sleep *= 2.0;
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}
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select(undef, undef, undef, $sleep);
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$wp = waitpid($pid, WNOHANG);
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($_, $_, $_, $_, $_, $_, $_, $s, $_, $_, $_, $_, $_) = stat("$tf");
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if (defined $s && ($s > ($off + $prebuf))) {
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$ready = 1;
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}
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if ($wp > 0) {
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$waited = 1;
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}
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if ($ready || $waited) {
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last;
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}
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|
}
|
|
|
|
# Stream.
|
|
if (open($f, "< $tf")) {
|
|
wav_loop($f, $off, $forgelen);
|
|
close($f);
|
|
}
|
|
if (! $waited) {
|
|
waitpid($pid, 0);
|
|
}
|
|
close($w);
|
|
unlink($tf);
|
|
}
|
|
|
|
sub mpeg4_proc
|
|
{
|
|
my ($fn) = shift;
|
|
my ($off) = shift;
|
|
my ($forgelen) = shift;
|
|
my ($f) = undef;
|
|
my ($hdr) = undef;
|
|
my ($r) = undef;
|
|
|
|
if (open($f, "< $fn")) {
|
|
my ($rl) = sysread($f, $hdr, 512);
|
|
close($f);
|
|
if ($rl != 512) {
|
|
return undef;
|
|
}
|
|
} else {
|
|
return undef;
|
|
}
|
|
|
|
#
|
|
# This detection is really rudimentary, but seems to
|
|
# do the job for now.
|
|
#
|
|
if (index($hdr, "Halac") >= 0) {
|
|
$r = alac_proc($fn, $off, $forgelen);
|
|
} else {
|
|
$r = ffmpeg_proc($fn, $off, $forgelen);
|
|
}
|
|
|
|
return $r;
|
|
}
|
|
|
|
sub alac_proc
|
|
{
|
|
my ($fn) = shift;
|
|
my ($off) = shift;
|
|
my ($forgelen) = shift;
|
|
my ($r) = undef;
|
|
my ($w) = undef;
|
|
my ($pid);
|
|
|
|
$pid = open2($r, $w, 'alac', "$fn");
|
|
wav_loop($r, $off, undef); # Ignore $forgelen
|
|
close($r);
|
|
close($w);
|
|
if (waitpid($pid, WNOHANG) <= 0) {
|
|
kill(SIGKILL, $pid);
|
|
waitpid($pid, 0);
|
|
}
|
|
}
|