Файл: F12/getid3/module.audio.flac.php
Строк: 336
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.flac.php //
// module for analyzing FLAC and OggFLAC audio files //
// dependencies: module.audio.ogg.php //
// ///
/////////////////////////////////////////////////////////////////
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);
class getid3_flac
{
function getid3_flac(&$fd, &$ThisFileInfo) {
// http://flac.sourceforge.net/format.html
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$StreamMarker = fread($fd, 4);
if ($StreamMarker != 'fLaC') {
$ThisFileInfo['error'][] = 'Expecting "fLaC" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$StreamMarker.'"';
return false;
}
$ThisFileInfo['fileformat'] = 'flac';
$ThisFileInfo['audio']['dataformat'] = 'flac';
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
$ThisFileInfo['audio']['lossless'] = true;
return getid3_flac::FLACparseMETAdata($fd, $ThisFileInfo);
}
function FLACparseMETAdata(&$fd, &$ThisFileInfo) {
do {
$METAdataBlockOffset = ftell($fd);
$METAdataBlockHeader = fread($fd, 4);
$METAdataLastBlockFlag = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80);
$METAdataBlockType = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7F;
$METAdataBlockLength = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 1, 3));
$METAdataBlockTypeText = getid3_flac::FLACmetaBlockTypeLookup($METAdataBlockType);
if ($METAdataBlockLength < 0) {
$ThisFileInfo['error'][] = 'corrupt or invalid METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$METAdataBlockType.') at offset '.$METAdataBlockOffset;
break;
}
$ThisFileInfo['flac'][$METAdataBlockTypeText]['raw'] = array();
$ThisFileInfo_flac_METAdataBlockTypeText_raw = &$ThisFileInfo['flac'][$METAdataBlockTypeText]['raw'];
$ThisFileInfo_flac_METAdataBlockTypeText_raw['offset'] = $METAdataBlockOffset;
$ThisFileInfo_flac_METAdataBlockTypeText_raw['last_meta_block'] = $METAdataLastBlockFlag;
$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_type'] = $METAdataBlockType;
$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_type_text'] = $METAdataBlockTypeText;
$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_length'] = $METAdataBlockLength;
$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'] = @fread($fd, $METAdataBlockLength);
$ThisFileInfo['avdataoffset'] = ftell($fd);
switch ($METAdataBlockTypeText) {
case 'STREAMINFO':
if (!getid3_flac::FLACparseSTREAMINFO($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'PADDING':
// ignore
break;
case 'APPLICATION':
if (!getid3_flac::FLACparseAPPLICATION($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'SEEKTABLE':
if (!getid3_flac::FLACparseSEEKTABLE($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'VORBIS_COMMENT':
$OldOffset = ftell($fd);
fseek($fd, 0 - $METAdataBlockLength, SEEK_CUR);
getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
fseek($fd, $OldOffset, SEEK_SET);
break;
case 'CUESHEET':
if (!getid3_flac::FLACparseCUESHEET($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
return false;
}
break;
default:
$ThisFileInfo['warning'][] = 'Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$METAdataBlockType.') at offset '.$METAdataBlockOffset;
break;
}
} while ($METAdataLastBlockFlag === false);
if (isset($ThisFileInfo['flac']['STREAMINFO'])) {
$ThisFileInfo['flac']['compressed_audio_bytes'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'];
$ThisFileInfo['flac']['uncompressed_audio_bytes'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] * $ThisFileInfo['flac']['STREAMINFO']['channels'] * ($ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] / 8);
if ($ThisFileInfo['flac']['uncompressed_audio_bytes'] == 0) {
$ThisFileInfo['error'][] = 'Corrupt FLAC file: uncompressed_audio_bytes == zero';
return false;
}
$ThisFileInfo['flac']['compression_ratio'] = $ThisFileInfo['flac']['compressed_audio_bytes'] / $ThisFileInfo['flac']['uncompressed_audio_bytes'];
}
// set md5_data_source - built into flac 0.5+
if (isset($ThisFileInfo['flac']['STREAMINFO']['audio_signature'])) {
if ($ThisFileInfo['flac']['STREAMINFO']['audio_signature'] === str_repeat("x00", 16)) {
$ThisFileInfo['warning'][] = 'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)';
} else {
$ThisFileInfo['md5_data_source'] = '';
$md5 = $ThisFileInfo['flac']['STREAMINFO']['audio_signature'];
for ($i = 0; $i < strlen($md5); $i++) {
$ThisFileInfo['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
}
if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data_source'])) {
unset($ThisFileInfo['md5_data_source']);
}
}
}
$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
if ($ThisFileInfo['audio']['bits_per_sample'] == 8) {
// special case
// must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value
// MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed
$ThisFileInfo['warning'][] = 'FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file';
}
if (!empty($ThisFileInfo['ogg']['vendor'])) {
$ThisFileInfo['audio']['encoder'] = $ThisFileInfo['ogg']['vendor'];
}
return true;
}
function FLACmetaBlockTypeLookup($blocktype) {
static $FLACmetaBlockTypeLookup = array();
if (empty($FLACmetaBlockTypeLookup)) {
$FLACmetaBlockTypeLookup[0] = 'STREAMINFO';
$FLACmetaBlockTypeLookup[1] = 'PADDING';
$FLACmetaBlockTypeLookup[2] = 'APPLICATION';
$FLACmetaBlockTypeLookup[3] = 'SEEKTABLE';
$FLACmetaBlockTypeLookup[4] = 'VORBIS_COMMENT';
$FLACmetaBlockTypeLookup[5] = 'CUESHEET';
}
return (isset($FLACmetaBlockTypeLookup[$blocktype]) ? $FLACmetaBlockTypeLookup[$blocktype] : 'reserved');
}
function FLACapplicationIDLookup($applicationid) {
static $FLACapplicationIDLookup = array();
if (empty($FLACapplicationIDLookup)) {
// http://flac.sourceforge.net/id.html
$FLACapplicationIDLookup[0x46746F6C] = 'flac-tools'; // 'Ftol'
$FLACapplicationIDLookup[0x46746F6C] = 'Sound Font FLAC'; // 'SFFL'
}
return (isset($FLACapplicationIDLookup[$applicationid]) ? $FLACapplicationIDLookup[$applicationid] : 'reserved');
}
function FLACparseSTREAMINFO($METAdataBlockData, &$ThisFileInfo) {
$offset = 0;
$ThisFileInfo['flac']['STREAMINFO']['min_block_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
$offset += 2;
$ThisFileInfo['flac']['STREAMINFO']['max_block_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
$offset += 2;
$ThisFileInfo['flac']['STREAMINFO']['min_frame_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 3));
$offset += 3;
$ThisFileInfo['flac']['STREAMINFO']['max_frame_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 3));
$offset += 3;
$SampleRateChannelsSampleBitsStreamSamples = getid3_lib::BigEndian2Bin(substr($METAdataBlockData, $offset, 8));
$ThisFileInfo['flac']['STREAMINFO']['sample_rate'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 0, 20));
$ThisFileInfo['flac']['STREAMINFO']['channels'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 20, 3)) + 1;
$ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 23, 5)) + 1;
$ThisFileInfo['flac']['STREAMINFO']['samples_stream'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 28, 36));
$offset += 8;
$ThisFileInfo['flac']['STREAMINFO']['audio_signature'] = substr($METAdataBlockData, $offset, 16);
$offset += 16;
if (!empty($ThisFileInfo['flac']['STREAMINFO']['sample_rate'])) {
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['flac']['STREAMINFO']['sample_rate'];
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['flac']['STREAMINFO']['channels'];
$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] / $ThisFileInfo['flac']['STREAMINFO']['sample_rate'];
$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
} else {
$ThisFileInfo['error'][] = 'Corrupt METAdata block: STREAMINFO';
return false;
}
return true;
}
function FLACparseAPPLICATION($METAdataBlockData, &$ThisFileInfo) {
$offset = 0;
$ApplicationID = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 4));
$offset += 4;
$ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['name'] = getid3_flac::FLACapplicationIDLookup($ApplicationID);
$ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['data'] = substr($METAdataBlockData, $offset);
$offset = $METAdataBlockLength;
return true;
}
function FLACparseSEEKTABLE($METAdataBlockData, &$ThisFileInfo) {
$offset = 0;
$METAdataBlockLength = strlen($METAdataBlockData);
$placeholderpattern = str_repeat("xFF", 8);
while ($offset < $METAdataBlockLength) {
$SampleNumberString = substr($METAdataBlockData, $offset, 8);
$offset += 8;
if ($SampleNumberString == $placeholderpattern) {
// placeholder point
@$ThisFileInfo['flac']['SEEKTABLE']['placeholders']++;
$offset += 10;
} else {
$SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString);
$ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
$offset += 8;
$ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
$offset += 2;
}
}
return true;
}
function FLACparseCUESHEET($METAdataBlockData, &$ThisFileInfo) {
$offset = 0;
$ThisFileInfo['flac']['CUESHEET']['media_catalog_number'] = trim(substr($METAdataBlockData, $offset, 128), " ");
$offset += 128;
$ThisFileInfo['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
$offset += 8;
$ThisFileInfo['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1)) & 0x80);
$offset += 1;
$offset += 258; // reserved
$ThisFileInfo['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
$offset += 1;
for ($track = 0; $track < $ThisFileInfo['flac']['CUESHEET']['number_tracks']; $track++) {
$TrackSampleOffset = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
$offset += 8;
$TrackNumber = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
$offset += 1;
$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset;
$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($METAdataBlockData, $offset, 12);
$offset += 12;
$TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
$offset += 1;
$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80);
$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40);
$offset += 13; // reserved
$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
$offset += 1;
for ($index = 0; $index < $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) {
$IndexSampleOffset = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
$offset += 8;
$IndexNumber = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
$offset += 1;
$offset += 3; // reserved
$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset;
}
}
return true;
}
}
?>