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<?php
if (!defined('GETID3_INCLUDEPATH')) {
exit;
}
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH . 'module.audio.ogg.php', __FILE__, true);
class getid3_flac extends getid3_handler
{
const syncword = 'fLaC';
public function Analyze()
{
$info =& $this->getid3->info;
$this->fseek($info['avdataoffset']);
$StreamMarker = $this->fread(4);
if ($StreamMarker != self::syncword) {
return $this->error('Expecting "' . getid3_lib::PrintHexBytes(self::syncword) . '" at offset ' . $info['avdataoffset'] . ', found "' . getid3_lib::PrintHexBytes($StreamMarker) . '"');
}
$info['fileformat'] = 'flac';
$info['audio']['dataformat'] = 'flac';
$info['audio']['bitrate_mode'] = 'vbr';
$info['audio']['lossless'] = true;
return $this->parseMETAdata();
}
public function parseMETAdata()
{
$info =& $this->getid3->info;
do {
$BlockOffset = $this->ftell();
$BlockHeader = $this->fread(4);
$LBFBT = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1));
$LastBlockFlag = (bool) ($LBFBT & 0x80);
$BlockType = $LBFBT & 0x7f;
$BlockLength = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3));
$BlockTypeText = self::metaBlockTypeLookup($BlockType);
if ($BlockOffset + 4 + $BlockLength > $info['avdataend']) {
$this->warning('METADATA_BLOCK_HEADER.BLOCK_TYPE (' . $BlockTypeText . ') at offset ' . $BlockOffset . ' extends beyond end of file');
break;
}
if ($BlockLength < 1) {
if ($BlockTypeText != 'reserved') {
$this->warning('METADATA_BLOCK_HEADER.BLOCK_LENGTH (' . $BlockTypeText . ') at offset ' . $BlockOffset . ' is zero bytes');
continue;
}
$this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH (' . $BlockLength . ') at offset ' . $BlockOffset . ' is invalid');
break;
}
$info['flac'][$BlockTypeText]['raw'] = array();
$BlockTypeText_raw =& $info['flac'][$BlockTypeText]['raw'];
$BlockTypeText_raw['offset'] = $BlockOffset;
$BlockTypeText_raw['last_meta_block'] = $LastBlockFlag;
$BlockTypeText_raw['block_type'] = $BlockType;
$BlockTypeText_raw['block_type_text'] = $BlockTypeText;
$BlockTypeText_raw['block_length'] = $BlockLength;
if ($BlockTypeText_raw['block_type'] != 0x6) {
$BlockTypeText_raw['block_data'] = $this->fread($BlockLength);
}
switch ($BlockTypeText) {
case 'STREAMINFO':
if (!$this->parseSTREAMINFO($BlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'PADDING':
unset($info['flac']['PADDING']);
break;
case 'APPLICATION':
if (!$this->parseAPPLICATION($BlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'SEEKTABLE':
if (!$this->parseSEEKTABLE($BlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'VORBIS_COMMENT':
if (!$this->parseVORBIS_COMMENT($BlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'CUESHEET':
if (!$this->parseCUESHEET($BlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'PICTURE':
if (!$this->parsePICTURE()) {
return false;
}
break;
default:
$this->warning('Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE (' . $BlockType . ') at offset ' . $BlockOffset);
}
unset($info['flac'][$BlockTypeText]['raw']);
$info['avdataoffset'] = $this->ftell();
} while ($LastBlockFlag === false);
if (!empty($info['flac']['VORBIS_COMMENT']['comments'])) {
$info['flac']['comments'] = $info['flac']['VORBIS_COMMENT']['comments'];
}
if (!empty($info['flac']['VORBIS_COMMENT']['vendor'])) {
$info['audio']['encoder'] = str_replace('reference ', '', $info['flac']['VORBIS_COMMENT']['vendor']);
}
if (isset($info['flac']['PICTURE']) && $this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE) {
foreach ($info['flac']['PICTURE'] as $entry) {
if (!empty($entry['data'])) {
if (!isset($info['flac']['comments']['picture'])) {
$info['flac']['comments']['picture'] = array();
}
$comments_picture_data = array();
foreach (array('data', 'image_mime', 'image_width', 'image_height', 'imagetype', 'picturetype', 'description', 'datalength') as $picture_key) {
if (isset($entry[$picture_key])) {
$comments_picture_data[$picture_key] = $entry[$picture_key];
}
}
$info['flac']['comments']['picture'][] = $comments_picture_data;
unset($comments_picture_data);
}
}
}
if (isset($info['flac']['STREAMINFO'])) {
if (!$this->isDependencyFor('matroska')) {
$info['flac']['compressed_audio_bytes'] = $info['avdataend'] - $info['avdataoffset'];
}
$info['flac']['uncompressed_audio_bytes'] = $info['flac']['STREAMINFO']['samples_stream'] * $info['flac']['STREAMINFO']['channels'] * ($info['flac']['STREAMINFO']['bits_per_sample'] / 8);
if ($info['flac']['uncompressed_audio_bytes'] == 0) {
return $this->error('Corrupt FLAC file: uncompressed_audio_bytes == zero');
}
if (!empty($info['flac']['compressed_audio_bytes'])) {
$info['flac']['compression_ratio'] = $info['flac']['compressed_audio_bytes'] / $info['flac']['uncompressed_audio_bytes'];
}
}
if (isset($info['flac']['STREAMINFO']['audio_signature'])) {
if ($info['flac']['STREAMINFO']['audio_signature'] === str_repeat("\0", 16)) {
$this->warning('FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)');
} else {
$info['md5_data_source'] = '';
$md5 = $info['flac']['STREAMINFO']['audio_signature'];
for ($i = 0; $i < strlen($md5); $i++) {
$info['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
}
if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) {
unset($info['md5_data_source']);
}
}
}
if (isset($info['flac']['STREAMINFO']['bits_per_sample'])) {
$info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
if ($info['audio']['bits_per_sample'] == 8) {
$this->warning('FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file');
}
}
return true;
}
public static function parseSTREAMINFOdata($BlockData)
{
$streaminfo = array();
$streaminfo['min_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 0, 2));
$streaminfo['max_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 2, 2));
$streaminfo['min_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 4, 3));
$streaminfo['max_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 7, 3));
$SRCSBSS = getid3_lib::BigEndian2Bin(substr($BlockData, 10, 8));
$streaminfo['sample_rate'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 0, 20));
$streaminfo['channels'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 20, 3)) + 1;
$streaminfo['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 23, 5)) + 1;
$streaminfo['samples_stream'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 28, 36));
$streaminfo['audio_signature'] = substr($BlockData, 18, 16);
return $streaminfo;
}
private function parseSTREAMINFO($BlockData)
{
$info =& $this->getid3->info;
$info['flac']['STREAMINFO'] = self::parseSTREAMINFOdata($BlockData);
if (!empty($info['flac']['STREAMINFO']['sample_rate'])) {
$info['audio']['bitrate_mode'] = 'vbr';
$info['audio']['sample_rate'] = $info['flac']['STREAMINFO']['sample_rate'];
$info['audio']['channels'] = $info['flac']['STREAMINFO']['channels'];
$info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
$info['playtime_seconds'] = $info['flac']['STREAMINFO']['samples_stream'] / $info['flac']['STREAMINFO']['sample_rate'];
if ($info['playtime_seconds'] > 0) {
if (!$this->isDependencyFor('matroska')) {
$info['audio']['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds'];
} else {
$this->warning('Cannot determine audio bitrate because total stream size is unknown');
}
}
} else {
return $this->error('Corrupt METAdata block: STREAMINFO');
}
return true;
}
private function parseAPPLICATION($BlockData)
{
$info =& $this->getid3->info;
$ApplicationID = getid3_lib::BigEndian2Int(substr($BlockData, 0, 4));
$info['flac']['APPLICATION'][$ApplicationID]['name'] = self::applicationIDLookup($ApplicationID);
$info['flac']['APPLICATION'][$ApplicationID]['data'] = substr($BlockData, 4);
return true;
}
private function parseSEEKTABLE($BlockData)
{
$info =& $this->getid3->info;
$offset = 0;
$BlockLength = strlen($BlockData);
$placeholderpattern = str_repeat("", 8);
while ($offset < $BlockLength) {
$SampleNumberString = substr($BlockData, $offset, 8);
$offset += 8;
if ($SampleNumberString == $placeholderpattern) {
getid3_lib::safe_inc($info['flac']['SEEKTABLE']['placeholders'], 1);
$offset += 10;
} else {
$SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString);
$info['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
$offset += 8;
$info['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 2));
$offset += 2;
}
}
return true;
}
private function parseVORBIS_COMMENT($BlockData)
{
$info =& $this->getid3->info;
$getid3_ogg = new getid3_ogg($this->getid3);
if ($this->isDependencyFor('matroska')) {
$getid3_ogg->setStringMode($this->data_string);
}
$getid3_ogg->ParseVorbisComments();
if (isset($info['ogg'])) {
unset($info['ogg']['comments_raw']);
$info['flac']['VORBIS_COMMENT'] = $info['ogg'];
unset($info['ogg']);
}
unset($getid3_ogg);
return true;
}
private function parseCUESHEET($BlockData)
{
$info =& $this->getid3->info;
$offset = 0;
$info['flac']['CUESHEET']['media_catalog_number'] = trim(substr($BlockData, $offset, 128), "\0");
$offset += 128;
$info['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
$offset += 8;
$info['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)) & 0x80);
$offset += 1;
$offset += 258;
$info['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
$offset += 1;
for ($track = 0; $track < $info['flac']['CUESHEET']['number_tracks']; $track++) {
$TrackSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
$offset += 8;
$TrackNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
$offset += 1;
$info['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset;
$info['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($BlockData, $offset, 12);
$offset += 12;
$TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
$offset += 1;
$info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80);
$info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40);
$offset += 13;
$info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
$offset += 1;
for ($index = 0; $index < $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) {
$IndexSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
$offset += 8;
$IndexNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
$offset += 1;
$offset += 3;
$info['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset;
}
}
return true;
}
public function parsePICTURE()
{
$info =& $this->getid3->info;
$picture['typeid'] = getid3_lib::BigEndian2Int($this->fread(4));
$picture['picturetype'] = self::pictureTypeLookup($picture['typeid']);
$picture['image_mime'] = $this->fread(getid3_lib::BigEndian2Int($this->fread(4)));
$descr_length = getid3_lib::BigEndian2Int($this->fread(4));
if ($descr_length) {
$picture['description'] = $this->fread($descr_length);
}
$picture['image_width'] = getid3_lib::BigEndian2Int($this->fread(4));
$picture['image_height'] = getid3_lib::BigEndian2Int($this->fread(4));
$picture['color_depth'] = getid3_lib::BigEndian2Int($this->fread(4));
$picture['colors_indexed'] = getid3_lib::BigEndian2Int($this->fread(4));
$picture['datalength'] = getid3_lib::BigEndian2Int($this->fread(4));
if ($picture['image_mime'] == '-->') {
$picture['data'] = $this->fread($picture['datalength']);
} else {
$picture['data'] = $this->saveAttachment(str_replace('/', '_', $picture['picturetype']) . '_' . $this->ftell(), $this->ftell(), $picture['datalength'], $picture['image_mime']);
}
$info['flac']['PICTURE'][] = $picture;
return true;
}
public static function metaBlockTypeLookup($blocktype)
{
static $lookup = array(0 => 'STREAMINFO', 1 => 'PADDING', 2 => 'APPLICATION', 3 => 'SEEKTABLE', 4 => 'VORBIS_COMMENT', 5 => 'CUESHEET', 6 => 'PICTURE');
return isset($lookup[$blocktype]) ? $lookup[$blocktype] : 'reserved';
}
public static function applicationIDLookup($applicationid)
{
static $lookup = array(0x41544348 => 'FlacFile', 0x42534f4c => 'beSolo', 0x42554753 => 'Bugs Player', 0x43756573 => 'GoldWave cue points (specification)', 0x46696361 => 'CUE Splitter', 0x46746f6c => 'flac-tools', 0x4d4f5442 => 'MOTB MetaCzar', 0x4d505345 => 'MP3 Stream Editor', 0x4d754d4c => 'MusicML: Music Metadata Language', 0x52494646 => 'Sound Devices RIFF chunk storage', 0x5346464c => 'Sound Font FLAC', 0x534f4e59 => 'Sony Creative Software', 0x5351455a => 'flacsqueeze', 0x54745776 => 'TwistedWave', 0x55495453 => 'UITS Embedding tools', 0x61696666 => 'FLAC AIFF chunk storage', 0x696d6167 => 'flac-image application for storing arbitrary files in APPLICATION metadata blocks', 0x7065656d => 'Parseable Embedded Extensible Metadata (specification)', 0x71667374 => 'QFLAC Studio', 0x72696666 => 'FLAC RIFF chunk storage', 0x74756e65 => 'TagTuner', 0x78626174 => 'XBAT', 0x786d6364 => 'xmcd');
return isset($lookup[$applicationid]) ? $lookup[$applicationid] : 'reserved';
}
public static function pictureTypeLookup($type_id)
{
static $lookup = array(0 => 'Other', 1 => '32x32 pixels \'file icon\' (PNG only)', 2 => 'Other file icon', 3 => 'Cover (front)', 4 => 'Cover (back)', 5 => 'Leaflet page', 6 => 'Media (e.g. label side of CD)', 7 => 'Lead artist/lead performer/soloist', 8 => 'Artist/performer', 9 => 'Conductor', 10 => 'Band/Orchestra', 11 => 'Composer', 12 => 'Lyricist/text writer', 13 => 'Recording Location', 14 => 'During recording', 15 => 'During performance', 16 => 'Movie/video screen capture', 17 => 'A bright coloured fish', 18 => 'Illustration', 19 => 'Band/artist logotype', 20 => 'Publisher/Studio logotype');
return isset($lookup[$type_id]) ? $lookup[$type_id] : 'reserved';
}
}