10 |
# http://www.obrador.com/essentialjpeg/HeaderInfo.htm |
# http://www.obrador.com/essentialjpeg/HeaderInfo.htm |
11 |
# http://lists.helixcommunity.org/pipermail/datatype-dev/2005-January/001886.html |
# http://lists.helixcommunity.org/pipermail/datatype-dev/2005-January/001886.html |
12 |
# http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm |
# http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm |
13 |
|
# http://wiki.multimedia.cx/index.php?title=IMA_ADPCM |
14 |
|
|
15 |
use strict; |
use strict; |
16 |
|
|
387 |
print ">> created $frame_nr ", $no_jpeg_header ? 'raw' : '', " jpeg $path ", -s $path, " bytes\n" if $verbose; |
print ">> created $frame_nr ", $no_jpeg_header ? 'raw' : '', " jpeg $path ", -s $path, " bytes\n" if $verbose; |
388 |
} |
} |
389 |
|
|
390 |
my ( $riff, $amv ) = x(12, 'Z4x4Z4'); |
# |
391 |
die "$path not RIFF but $riff" if $riff ne 'RIFF'; |
# IMA ADPCM decoder |
392 |
die "$path not AMV but $amv" if $amv ne 'AMV '; |
# |
393 |
|
|
394 |
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my @index_adjust = ( -1, -1, -1, -1, 2, 4, 6, 8 ); |
395 |
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396 |
|
my @step_size = ( |
397 |
|
7, 8, 9, 10, 11, 12, 13, 14, 16, 17, |
398 |
|
19, 21, 23, 25, 28, 31, 34, 37, 41, 45, |
399 |
|
50, 55, 60, 66, 73, 80, 88, 97, 107, 118, |
400 |
|
130, 143, 157, 173, 190, 209, 230, 253, 279, 307, |
401 |
|
337, 371, 408, 449, 494, 544, 598, 658, 724, 796, |
402 |
|
876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, |
403 |
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2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, |
404 |
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5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, |
405 |
|
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 |
406 |
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); |
407 |
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|
408 |
my $apath = "$dump_dir/audio.wav"; |
my $pred_val = 0; |
409 |
open(my $audio_fh, '>', $apath) || die "can't open audio file $apath: $!"; |
my $step_idx = 0; |
410 |
|
|
411 |
print $audio_fh pack 'a4Va4a4VvvVVv4', ( |
# This code is "borrowed" from the ALSA library |
412 |
# header 'RIFF', size |
# http://www.alsa-project.org |
413 |
'RIFF',-1, |
|
414 |
# type: 'WAVE' |
sub adpcm_decode_sample { |
415 |
'WAVE', |
my $code = shift; |
416 |
'fmt ',0x14, |
|
417 |
# format: DVI (IMA) ADPCM Wave Type |
my $pred_diff; # Predicted difference to next sample |
418 |
0x11, |
my $step; # holds previous step_size value |
419 |
# channels |
|
420 |
1, |
# Separate sign and magnitude |
421 |
# samples/sec |
my $sign = $code & 0x8; |
422 |
|
$code &= 0x7; |
423 |
|
|
424 |
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# Computes pred_diff = (code + 0.5) * step / 4, |
425 |
|
# but see comment in adpcm_coder. |
426 |
|
|
427 |
|
$step = $step_size[$step_idx] || die "no step_size[$step_idx]"; |
428 |
|
|
429 |
|
# Compute difference and new predicted value |
430 |
|
$pred_diff = $step >> 3; |
431 |
|
my $i = 0x4; |
432 |
|
while( $i ) { |
433 |
|
if ($code & $i) { |
434 |
|
$pred_diff += $step; |
435 |
|
} |
436 |
|
$i >>= 1; |
437 |
|
$step >>= 1; |
438 |
|
} |
439 |
|
$pred_val += $sign ? -$pred_diff : $pred_diff; |
440 |
|
|
441 |
|
# Clamp output value |
442 |
|
if ($pred_val > 32767) { |
443 |
|
$pred_val = 32767; |
444 |
|
} elsif ($pred_val < -32768) { |
445 |
|
$pred_val = -32768; |
446 |
|
} |
447 |
|
|
448 |
|
# Find new step_size index value |
449 |
|
$step_idx += $index_adjust[$code]; |
450 |
|
|
451 |
|
if ($step_idx < 0) { |
452 |
|
$step_idx = 0; |
453 |
|
} elsif ($step_idx > 88) { |
454 |
|
$step_idx = 88; |
455 |
|
} |
456 |
|
return $pred_val; |
457 |
|
} |
458 |
|
|
459 |
|
open(my $au_fh, '>', 'out.au') || die "can't open out.au: $!"; |
460 |
|
print $au_fh pack 'a4N5', ( |
461 |
|
# magic |
462 |
|
'.snd', |
463 |
|
# data offset |
464 |
|
24, |
465 |
|
# data size |
466 |
|
-1, |
467 |
|
# encoding - 16-bit linear PCM |
468 |
|
3, |
469 |
|
# sample rate |
470 |
22050, |
22050, |
471 |
# avg. bytes/sec (for esimation) |
#channels |
472 |
11567, |
1, |
|
# block align (size of block) |
|
|
0x800, |
|
|
# bits per sample (mono data) |
|
|
4, |
|
|
# cbSize (ADPCM with 7 soefficient pairs) |
|
|
2, |
|
|
# nSamplesPerBlock |
|
|
# (((nBlockAlign - (7 * nChannels)) * 8) / (wBitsPerSample * nChannels)) + 2 |
|
|
0x0ff9, |
|
473 |
); |
); |
474 |
|
|
475 |
print $audio_fh pack 'a4VVa4V', ( |
sub audio_frame { |
476 |
# time length of the data in samples |
my $data = shift || die "no data?"; |
477 |
'fact',4, |
|
478 |
220500, |
my ( $origin, $index, $bytes ) = unpack 'ssL', substr($data,0,8); |
479 |
# |
|
480 |
'data',-1, |
warn "audio_frame origin $origin index $index bytes $bytes\n"; |
481 |
); |
hex_dump( substr($data,0,8) ); |
482 |
|
|
483 |
my $riff_header_len = tell($audio_fh); |
$pred_val = $origin; |
484 |
|
$step_idx = $index; |
485 |
|
|
486 |
|
foreach my $b ( map { ord($_) } split(//, substr($data,8)) ) { |
487 |
|
print $au_fh pack 'n', adpcm_decode_sample( $b >> 4 ); |
488 |
|
print $au_fh pack 'n', adpcm_decode_sample( $b & 15 ); |
489 |
|
} |
490 |
|
} |
491 |
|
|
492 |
|
|
493 |
|
sub x_audio_frame { |
494 |
|
my $data = shift || die "no data?"; |
495 |
|
|
496 |
|
my $apath = sprintf("$dump_dir/%04d.wav", $frame_nr ); |
497 |
|
open(my $audio_fh, '>', $apath) || die "can't open audio file $apath: $!"; |
498 |
|
|
499 |
|
print $audio_fh pack 'a4Va4a4VvvVVv4', ( |
500 |
|
# header 'RIFF', size |
501 |
|
'RIFF',-1, |
502 |
|
# type: 'WAVE' |
503 |
|
'WAVE', |
504 |
|
'fmt ',0x14, |
505 |
|
# format: DVI (IMA) ADPCM Wave Type |
506 |
|
0x11, |
507 |
|
# channels |
508 |
|
1, |
509 |
|
# samples/sec |
510 |
|
22050, |
511 |
|
# avg. bytes/sec (for esimation) |
512 |
|
11567, |
513 |
|
# block align (size of block) |
514 |
|
0x800, |
515 |
|
# bits per sample (mono data) |
516 |
|
4, |
517 |
|
# cbSize (ADPCM with 7 soefficient pairs) |
518 |
|
2, |
519 |
|
# nSamplesPerBlock |
520 |
|
# (((nBlockAlign - (7 * nChannels)) * 8) / (wBitsPerSample * nChannels)) + 2 |
521 |
|
0x03f9, |
522 |
|
); |
523 |
|
|
524 |
|
print $audio_fh pack 'a4VVa4V', ( |
525 |
|
# time length of the data in samples |
526 |
|
'fact',4, |
527 |
|
220500, |
528 |
|
# |
529 |
|
'data',-1, |
530 |
|
); |
531 |
|
|
532 |
|
my $riff_header_len = tell($audio_fh); |
533 |
|
|
534 |
|
print $audio_fh $data; |
535 |
|
|
536 |
|
my $size = tell($audio_fh); |
537 |
|
warn "## wav file $apath size: $size\n"; |
538 |
|
|
539 |
|
seek( $audio_fh, 4, 0 ); |
540 |
|
print $audio_fh pack("V", $size - 8); |
541 |
|
seek( $audio_fh, $riff_header_len - 4, 0 ); |
542 |
|
print $audio_fh pack("V", $size - $riff_header_len); |
543 |
|
|
544 |
|
close($audio_fh) || die "can't close audio file $apath: $!"; |
545 |
|
} |
546 |
|
|
547 |
|
# |
548 |
|
# read AMV file |
549 |
|
# |
550 |
|
|
551 |
|
my ( $riff, $amv ) = x(12, 'Z4x4Z4'); |
552 |
|
die "$path not RIFF but $riff" if $riff ne 'RIFF'; |
553 |
|
die "$path not AMV but $amv" if $amv ne 'AMV '; |
554 |
|
|
555 |
while ( ! defined($d->{eof}) ) { |
while ( ! defined($d->{eof}) ) { |
556 |
my ( $list, $name ) = x(12,'A4x4A4'); |
my ( $list, $name ) = x(12,'A4x4A4'); |
602 |
} |
} |
603 |
|
|
604 |
# remove 8 bytes of something |
# remove 8 bytes of something |
605 |
$audio_frame = substr( $audio_frame, 8 ); |
# $audio_frame = substr( $audio_frame, 8 ); |
606 |
|
|
607 |
if ( length($audio_frame) % 2 == 0 ) { |
if ( length($audio_frame) % 2 == 0 ) { |
608 |
print "#### even sized frame!"; |
print "#### even sized frame!"; |
610 |
} |
} |
611 |
|
|
612 |
# print $audio_fh mp3_frame; |
# print $audio_fh mp3_frame; |
613 |
print $audio_fh $audio_frame || die "can't write audio frame in $apath: $!"; |
audio_frame( $audio_frame ); |
614 |
|
|
615 |
$frame_nr++; |
$frame_nr++; |
616 |
}; |
}; |
623 |
my $cmd = "ffmpeg -i $dump_dir/%04d.jpg -r 16 -y $dump_avi"; |
my $cmd = "ffmpeg -i $dump_dir/%04d.jpg -r 16 -y $dump_avi"; |
624 |
system($cmd) == 0 || die "can't convert frames to avi using $cmd: $!"; |
system($cmd) == 0 || die "can't convert frames to avi using $cmd: $!"; |
625 |
|
|
626 |
my $size = tell($audio_fh); |
print ">>>> created $frame_nr frames $dump_avi ", -s $dump_avi, "\n"; |
|
warn "## wav file size: $size\n"; |
|
|
|
|
|
seek( $audio_fh, 4, 0 ); |
|
|
print $audio_fh pack("V", $size - 8); |
|
|
seek( $audio_fh, $riff_header_len - 4, 0 ); |
|
|
print $audio_fh pack("V", $size - $riff_header_len); |
|
|
|
|
|
close($audio_fh) || die "can't close audio file $apath: $!"; |
|
|
|
|
|
print ">>>> created $frame_nr frames $dump_avi ", -s $dump_avi, " and $apath ", -s $apath, "\n"; |
|