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getid3_wavpack Class Reference

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g // More...

+ Collaboration diagram for getid3_wavpack:

Public Member Functions

 getid3_wavpack (&$fd, &$ThisFileInfo)
 WavPackMetablockNameLookup (&$id)

Detailed Description

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //

Definition at line 17 of file module.audio.wavpack.php.

Member Function Documentation

getid3_wavpack::getid3_wavpack ( &  $fd,
&  $ThisFileInfo 
)

Definition at line 20 of file module.audio.wavpack.php.

References getid3_lib\IncludeDependency(), getid3_lib\LittleEndian2Int(), getid3_riff\ParseRIFF(), getid3_riff\ParseRIFFdata(), getid3_lib\PrintHexBytes(), getid3_riff\RIFFcommentsParse(), and WavPackMetablockNameLookup().

{
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
while (true) {
$wavpackheader = fread($fd, 32);
if (ftell($fd) >= $ThisFileInfo['avdataend']) {
break;
} elseif (feof($fd)) {
break;
} elseif (
(@$ThisFileInfo['wavpack']['blockheader']['total_samples'] > 0) &&
(@$ThisFileInfo['wavpack']['blockheader']['block_samples'] > 0) &&
(!isset($ThisFileInfo['wavpack']['riff_trailer_size']) || ($ThisFileInfo['wavpack']['riff_trailer_size'] <= 0)) &&
((@$ThisFileInfo['wavpack']['config_flags']['md5_checksum'] === false) || !empty($ThisFileInfo['md5_data_source']))) {
break;
}
$blockheader_offset = ftell($fd) - 32;
$blockheader_magic = substr($wavpackheader, 0, 4);
$blockheader_size = getid3_lib::LittleEndian2Int(substr($wavpackheader, 4, 4));
if ($blockheader_magic != 'wvpk') {
$ThisFileInfo['error'][] = 'Expecting "wvpk" at offset '.$blockheader_offset.', found "'.$blockheader_magic.'"';
if ((@$ThisFileInfo['audio']['dataformat'] != 'wavpack') && (@$ThisFileInfo['audio']['dataformat'] != 'wvc')) {
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['audio']);
unset($ThisFileInfo['wavpack']);
}
return false;
}
if ((@$ThisFileInfo['wavpack']['blockheader']['block_samples'] <= 0) ||
(@$ThisFileInfo['wavpack']['blockheader']['total_samples'] <= 0)) {
// Also, it is possible that the first block might not have
// any samples (block_samples == 0) and in this case you should skip blocks
// until you find one with samples because the other information (like
// total_samples) are not guaranteed to be correct until (block_samples > 0)
// Finally, I have defined a format for files in which the length is not known
// (for example when raw files are created using pipes). In these cases
// total_samples will be -1 and you must seek to the final block to determine
// the total number of samples.
$ThisFileInfo['audio']['dataformat'] = 'wavpack';
$ThisFileInfo['fileformat'] = 'wavpack';
$ThisFileInfo['audio']['lossless'] = true;
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
$ThisFileInfo['wavpack']['blockheader']['offset'] = $blockheader_offset;
$ThisFileInfo['wavpack']['blockheader']['magic'] = $blockheader_magic;
$ThisFileInfo['wavpack']['blockheader']['size'] = $blockheader_size;
if ($ThisFileInfo['wavpack']['blockheader']['size'] >= 0x100000) {
$ThisFileInfo['error'][] = 'Expecting WavPack block size less than "0x100000", found "'.$ThisFileInfo['wavpack']['blockheader']['size'].'" at offset '.$ThisFileInfo['wavpack']['blockheader']['offset'];
if ((@$ThisFileInfo['audio']['dataformat'] != 'wavpack') && (@$ThisFileInfo['audio']['dataformat'] != 'wvc')) {
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['audio']);
unset($ThisFileInfo['wavpack']);
}
return false;
}
$ThisFileInfo['wavpack']['blockheader']['minor_version'] = ord($wavpackheader{8});
$ThisFileInfo['wavpack']['blockheader']['major_version'] = ord($wavpackheader{9});
if (($ThisFileInfo['wavpack']['blockheader']['major_version'] != 4) ||
(($ThisFileInfo['wavpack']['blockheader']['minor_version'] < 4) &&
($ThisFileInfo['wavpack']['blockheader']['minor_version'] > 16))) {
$ThisFileInfo['error'][] = 'Expecting WavPack version between "4.2" and "4.16", found version "'.$ThisFileInfo['wavpack']['blockheader']['major_version'].'.'.$ThisFileInfo['wavpack']['blockheader']['minor_version'].'" at offset '.$ThisFileInfo['wavpack']['blockheader']['offset'];
if ((@$ThisFileInfo['audio']['dataformat'] != 'wavpack') && (@$ThisFileInfo['audio']['dataformat'] != 'wvc')) {
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['audio']);
unset($ThisFileInfo['wavpack']);
}
return false;
}
$ThisFileInfo['wavpack']['blockheader']['track_number'] = ord($wavpackheader{10}); // unused
$ThisFileInfo['wavpack']['blockheader']['index_number'] = ord($wavpackheader{11}); // unused
$ThisFileInfo['wavpack']['blockheader']['total_samples'] = getid3_lib::LittleEndian2Int(substr($wavpackheader, 12, 4));
$ThisFileInfo['wavpack']['blockheader']['block_index'] = getid3_lib::LittleEndian2Int(substr($wavpackheader, 16, 4));
$ThisFileInfo['wavpack']['blockheader']['block_samples'] = getid3_lib::LittleEndian2Int(substr($wavpackheader, 20, 4));
$ThisFileInfo['wavpack']['blockheader']['flags_raw'] = getid3_lib::LittleEndian2Int(substr($wavpackheader, 24, 4));
$ThisFileInfo['wavpack']['blockheader']['crc'] = getid3_lib::LittleEndian2Int(substr($wavpackheader, 28, 4));
$ThisFileInfo['wavpack']['blockheader']['flags']['bytes_per_sample'] = 1 + ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000003);
$ThisFileInfo['wavpack']['blockheader']['flags']['mono'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000004);
$ThisFileInfo['wavpack']['blockheader']['flags']['hybrid'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000008);
$ThisFileInfo['wavpack']['blockheader']['flags']['joint_stereo'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000010);
$ThisFileInfo['wavpack']['blockheader']['flags']['cross_decorrelation'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000020);
$ThisFileInfo['wavpack']['blockheader']['flags']['hybrid_noiseshape'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000040);
$ThisFileInfo['wavpack']['blockheader']['flags']['ieee_32bit_float'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000080);
$ThisFileInfo['wavpack']['blockheader']['flags']['int_32bit'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000100);
$ThisFileInfo['wavpack']['blockheader']['flags']['hybrid_bitrate_noise'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000200);
$ThisFileInfo['wavpack']['blockheader']['flags']['hybrid_balance_noise'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000400);
$ThisFileInfo['wavpack']['blockheader']['flags']['multichannel_initial'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00000800);
$ThisFileInfo['wavpack']['blockheader']['flags']['multichannel_final'] = (bool) ($ThisFileInfo['wavpack']['blockheader']['flags_raw'] & 0x00001000);
$ThisFileInfo['audio']['lossless'] = !$ThisFileInfo['wavpack']['blockheader']['flags']['hybrid'];
}
while (!feof($fd) && (ftell($fd) < ($blockheader_offset + $blockheader_size + 8))) {
$metablock = array('offset'=>ftell($fd));
$metablockheader = fread($fd, 2);
if (feof($fd)) {
break;
}
$metablock['id'] = ord($metablockheader{0});
$metablock['function_id'] = ($metablock['id'] & 0x3F);
$metablock['function_name'] = $this->WavPackMetablockNameLookup($metablock['function_id']);
// The 0x20 bit in the id of the meta subblocks (which is defined as
// ID_OPTIONAL_DATA) is a permanent part of the id. The idea is that
// if a decoder encounters an id that it does not know about, it uses
// that "ID_OPTIONAL_DATA" flag to determine what to do. If it is set
// then the decoder simply ignores the metadata, but if it is zero
// then the decoder should quit because it means that an understanding
// of the metadata is required to correctly decode the audio.
$metablock['non_decoder'] = (bool) ($metablock['id'] & 0x20);
$metablock['padded_data'] = (bool) ($metablock['id'] & 0x40);
$metablock['large_block'] = (bool) ($metablock['id'] & 0x80);
if ($metablock['large_block']) {
$metablockheader .= fread($fd, 2);
}
$metablock['size'] = getid3_lib::LittleEndian2Int(substr($metablockheader, 1)) * 2; // size is stored in words
$metablock['data'] = null;
if ($metablock['size'] > 0) {
switch ($metablock['function_id']) {
case 0x21: // ID_RIFF_HEADER
case 0x22: // ID_RIFF_TRAILER
case 0x23: // ID_REPLAY_GAIN
case 0x24: // ID_CUESHEET
case 0x25: // ID_CONFIG_BLOCK
case 0x26: // ID_MD5_CHECKSUM
$metablock['data'] = fread($fd, $metablock['size']);
if ($metablock['padded_data']) {
// padded to the nearest even byte
$metablock['size']--;
$metablock['data'] = substr($metablock['data'], 0, -1);
}
break;
case 0x00: // ID_DUMMY
case 0x01: // ID_ENCODER_INFO
case 0x02: // ID_DECORR_TERMS
case 0x03: // ID_DECORR_WEIGHTS
case 0x04: // ID_DECORR_SAMPLES
case 0x05: // ID_ENTROPY_VARS
case 0x06: // ID_HYBRID_PROFILE
case 0x07: // ID_SHAPING_WEIGHTS
case 0x08: // ID_FLOAT_INFO
case 0x09: // ID_INT32_INFO
case 0x0A: // ID_WV_BITSTREAM
case 0x0B: // ID_WVC_BITSTREAM
case 0x0C: // ID_WVX_BITSTREAM
case 0x0D: // ID_CHANNEL_INFO
fseek($fd, $metablock['offset'] + ($metablock['large_block'] ? 4 : 2) + $metablock['size'], SEEK_SET);
break;
default:
$ThisFileInfo['warning'][] = 'Unexpected metablock type "0x'.str_pad(dechex($metablock['function_id']), 2, '0', STR_PAD_LEFT).'" at offset '.$metablock['offset'];
fseek($fd, $metablock['offset'] + ($metablock['large_block'] ? 4 : 2) + $metablock['size'], SEEK_SET);
break;
}
switch ($metablock['function_id']) {
case 0x21: // ID_RIFF_HEADER
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
$original_wav_filesize = getid3_lib::LittleEndian2Int(substr($metablock['data'], 4, 4));
getid3_riff::ParseRIFFdata($metablock['data'], $ParsedRIFFheader);
$metablock['riff'] = $ParsedRIFFheader['riff'];
$metablock['riff']['original_filesize'] = $original_wav_filesize;
$ThisFileInfo['wavpack']['riff_trailer_size'] = $original_wav_filesize - $metablock['riff']['WAVE']['data'][0]['size'] - $metablock['riff']['header_size'];
$ThisFileInfo['audio']['sample_rate'] = $ParsedRIFFheader['riff']['raw']['fmt ']['nSamplesPerSec'];
$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['wavpack']['blockheader']['total_samples'] / $ThisFileInfo['audio']['sample_rate'];
// Safe RIFF header in case there's a RIFF footer later
$metablockRIFFheader = $metablock['data'];
break;
case 0x22: // ID_RIFF_TRAILER
$metablockRIFFfooter = $metablockRIFFheader.$metablock['data'];
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
$ftell_old = ftell($fd);
$startoffset = $metablock['offset'] + ($metablock['large_block'] ? 4 : 2);
$ParsedRIFFfooter = array('avdataend'=>$ThisFileInfo['avdataend'], 'fileformat'=>'riff', 'error'=>array(), 'warning'=>array());
$metablock['riff'] = getid3_riff::ParseRIFF($fd, $startoffset, $startoffset + $metablock['size'], $ParsedRIFFfooter);
fseek($fd, $ftell_old, SEEK_SET);
if (!empty($metablock['riff']['INFO'])) {
getid3_riff::RIFFcommentsParse($metablock['riff']['INFO'], $metablock['comments']);
$ThisFileInfo['tags']['riff'] = $metablock['comments'];
}
break;
case 0x23: // ID_REPLAY_GAIN
$ThisFileInfo['warning'][] = 'WavPack "Replay Gain" contents not yet handled by getID3() in metablock at offset '.$metablock['offset'];
break;
case 0x24: // ID_CUESHEET
$ThisFileInfo['warning'][] = 'WavPack "Cuesheet" contents not yet handled by getID3() in metablock at offset '.$metablock['offset'];
break;
case 0x25: // ID_CONFIG_BLOCK
$metablock['flags_raw'] = getid3_lib::LittleEndian2Int(substr($metablock['data'], 0, 3));
$metablock['flags']['adobe_mode'] = (bool) ($metablock['flags_raw'] & 0x000001); // "adobe" mode for 32-bit floats
$metablock['flags']['fast_flag'] = (bool) ($metablock['flags_raw'] & 0x000002); // fast mode
$metablock['flags']['very_fast_flag'] = (bool) ($metablock['flags_raw'] & 0x000004); // double fast
$metablock['flags']['high_flag'] = (bool) ($metablock['flags_raw'] & 0x000008); // high quality mode
$metablock['flags']['very_high_flag'] = (bool) ($metablock['flags_raw'] & 0x000010); // double high (not used yet)
$metablock['flags']['bitrate_kbps'] = (bool) ($metablock['flags_raw'] & 0x000020); // bitrate is kbps, not bits / sample
$metablock['flags']['auto_shaping'] = (bool) ($metablock['flags_raw'] & 0x000040); // automatic noise shaping
$metablock['flags']['shape_override'] = (bool) ($metablock['flags_raw'] & 0x000080); // shaping mode specified
$metablock['flags']['joint_override'] = (bool) ($metablock['flags_raw'] & 0x000100); // joint-stereo mode specified
$metablock['flags']['copy_time'] = (bool) ($metablock['flags_raw'] & 0x000200); // copy file-time from source
$metablock['flags']['create_exe'] = (bool) ($metablock['flags_raw'] & 0x000400); // create executable
$metablock['flags']['create_wvc'] = (bool) ($metablock['flags_raw'] & 0x000800); // create correction file
$metablock['flags']['optimize_wvc'] = (bool) ($metablock['flags_raw'] & 0x001000); // maximize bybrid compression
$metablock['flags']['quality_mode'] = (bool) ($metablock['flags_raw'] & 0x002000); // psychoacoustic quality mode
$metablock['flags']['raw_flag'] = (bool) ($metablock['flags_raw'] & 0x004000); // raw mode (not implemented yet)
$metablock['flags']['calc_noise'] = (bool) ($metablock['flags_raw'] & 0x008000); // calc noise in hybrid mode
$metablock['flags']['lossy_mode'] = (bool) ($metablock['flags_raw'] & 0x010000); // obsolete (for information)
$metablock['flags']['extra_mode'] = (bool) ($metablock['flags_raw'] & 0x020000); // extra processing mode
$metablock['flags']['skip_wvx'] = (bool) ($metablock['flags_raw'] & 0x040000); // no wvx stream w/ floats & big ints
$metablock['flags']['md5_checksum'] = (bool) ($metablock['flags_raw'] & 0x080000); // compute & store MD5 signature
$metablock['flags']['quiet_mode'] = (bool) ($metablock['flags_raw'] & 0x100000); // don't report progress %
$ThisFileInfo['wavpack']['config_flags'] = $metablock['flags'];
if ($ThisFileInfo['wavpack']['blockheader']['flags']['hybrid']) {
@$ThisFileInfo['audio']['encoder_options'] .= ' -b???';
}
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['adobe_mode'] ? ' -a' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['optimize_wvc'] ? ' -cc' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['create_exe'] ? ' -e' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['fast_flag'] ? ' -f' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['joint_override'] ? ' -j?' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['high_flag'] ? ' -h' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['md5_checksum'] ? ' -m' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['calc_noise'] ? ' -n' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['shape_override'] ? ' -s?' : '');
@$ThisFileInfo['audio']['encoder_options'] .= ($metablock['flags']['extra_mode'] ? ' -x?' : '');
if (@$ThisFileInfo['audio']['encoder_options']) {
$ThisFileInfo['audio']['encoder_options'] = trim(@$ThisFileInfo['audio']['encoder_options']);
}
elseif (isset($ThisFileInfo['audio']['encoder_options'])) {
unset($ThisFileInfo['audio']['encoder_options']);
}
break;
case 0x26: // ID_MD5_CHECKSUM
if (strlen($metablock['data']) == 16) {
$ThisFileInfo['md5_data_source'] = strtolower(getid3_lib::PrintHexBytes($metablock['data'], true, false, false));
} else {
$ThisFileInfo['warning'][] = 'Expecting 16 bytes of WavPack "MD5 Checksum" in metablock at offset '.$metablock['offset'].', but found '.strlen($metablock['data']).' bytes';
}
break;
case 0x00: // ID_DUMMY
case 0x01: // ID_ENCODER_INFO
case 0x02: // ID_DECORR_TERMS
case 0x03: // ID_DECORR_WEIGHTS
case 0x04: // ID_DECORR_SAMPLES
case 0x05: // ID_ENTROPY_VARS
case 0x06: // ID_HYBRID_PROFILE
case 0x07: // ID_SHAPING_WEIGHTS
case 0x08: // ID_FLOAT_INFO
case 0x09: // ID_INT32_INFO
case 0x0A: // ID_WV_BITSTREAM
case 0x0B: // ID_WVC_BITSTREAM
case 0x0C: // ID_WVX_BITSTREAM
case 0x0D: // ID_CHANNEL_INFO
unset($metablock);
break;
}
}
if (!empty($metablock)) {
$ThisFileInfo['wavpack']['metablocks'][] = $metablock;
}
}
}
$ThisFileInfo['audio']['encoder'] = 'WavPack v'.$ThisFileInfo['wavpack']['blockheader']['major_version'].'.'.str_pad($ThisFileInfo['wavpack']['blockheader']['minor_version'], 2, '0', STR_PAD_LEFT);
$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['wavpack']['blockheader']['flags']['bytes_per_sample'] * 8;
$ThisFileInfo['audio']['channels'] = ($ThisFileInfo['wavpack']['blockheader']['flags']['mono'] ? 1 : 2);
if (@$ThisFileInfo['playtime_seconds']) {
$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
} else {
$ThisFileInfo['audio']['dataformat'] = 'wvc';
}
return true;
}

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getid3_wavpack::WavPackMetablockNameLookup ( &  $id)

Definition at line 343 of file module.audio.wavpack.php.

Referenced by getid3_wavpack().

{
static $WavPackMetablockNameLookup = array(
0x00 => 'Dummy',
0x01 => 'Encoder Info',
0x02 => 'Decorrelation Terms',
0x03 => 'Decorrelation Weights',
0x04 => 'Decorrelation Samples',
0x05 => 'Entropy Variables',
0x06 => 'Hybrid Profile',
0x07 => 'Shaping Weights',
0x08 => 'Float Info',
0x09 => 'Int32 Info',
0x0A => 'WV Bitstream',
0x0B => 'WVC Bitstream',
0x0C => 'WVX Bitstream',
0x0D => 'Channel Info',
0x21 => 'RIFF header',
0x22 => 'RIFF trailer',
0x23 => 'Replay Gain',
0x24 => 'Cuesheet',
0x25 => 'Config Block',
0x26 => 'MD5 Checksum',
);
return (@$WavPackMetablockNameLookup[$id]);
}

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The documentation for this class was generated from the following file: