2010 lines
97 KiB
PHP
2010 lines
97 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.mp3.php //
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// module for analyzing MP3 files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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// number of frames to scan to determine if MPEG-audio sequence is valid
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// Lower this number to 5-20 for faster scanning
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// Increase this number to 50+ for most accurate detection of valid VBR/CBR
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// mpeg-audio streams
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define('GETID3_MP3_VALID_CHECK_FRAMES', 35);
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class getid3_mp3 extends getid3_handler
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{
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public $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files
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public function Analyze() {
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$info = &$this->getid3->info;
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$initialOffset = $info['avdataoffset'];
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if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
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if ($this->allow_bruteforce) {
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$info['error'][] = 'Rescanning file in BruteForce mode';
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$this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info);
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}
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}
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if (isset($info['mpeg']['audio']['bitrate_mode'])) {
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$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
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}
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if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
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$synchoffsetwarning = 'Unknown data before synch ';
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if (isset($info['id3v2']['headerlength'])) {
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$synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
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} elseif ($initialOffset > 0) {
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$synchoffsetwarning .= '(should be at '.$initialOffset.', ';
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} else {
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$synchoffsetwarning .= '(should be at beginning of file, ';
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}
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$synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
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if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
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if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
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$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
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$info['audio']['codec'] = 'LAME';
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$CurrentDataLAMEversionString = 'LAME3.';
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} elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
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$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
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$info['audio']['codec'] = 'LAME';
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$CurrentDataLAMEversionString = 'LAME3.';
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}
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}
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$info['warning'][] = $synchoffsetwarning;
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}
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if (isset($info['mpeg']['audio']['LAME'])) {
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$info['audio']['codec'] = 'LAME';
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if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
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$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
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} elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
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$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
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}
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}
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$CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
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if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
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// a version number of LAME that does not end with a number like "LAME3.92"
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// or with a closing parenthesis like "LAME3.88 (alpha)"
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// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
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// not sure what the actual last frame length will be, but will be less than or equal to 1441
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$PossiblyLongerLAMEversion_FrameLength = 1441;
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// Not sure what version of LAME this is - look in padding of last frame for longer version string
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$PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
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fseek($this->getid3->fp, $PossibleLAMEversionStringOffset);
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$PossiblyLongerLAMEversion_Data = fread($this->getid3->fp, $PossiblyLongerLAMEversion_FrameLength);
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switch (substr($CurrentDataLAMEversionString, -1)) {
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case 'a':
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case 'b':
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// "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
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// need to trim off "a" to match longer string
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$CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
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break;
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}
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if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
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if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
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$PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
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if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
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$info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
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}
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}
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}
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}
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if (!empty($info['audio']['encoder'])) {
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$info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
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}
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switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
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case 1:
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case 2:
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$info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
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break;
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}
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if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
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switch ($info['audio']['dataformat']) {
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case 'mp1':
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case 'mp2':
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case 'mp3':
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$info['fileformat'] = $info['audio']['dataformat'];
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break;
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default:
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$info['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"';
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break;
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}
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}
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if (empty($info['fileformat'])) {
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unset($info['fileformat']);
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unset($info['audio']['bitrate_mode']);
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unset($info['avdataoffset']);
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unset($info['avdataend']);
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return false;
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}
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$info['mime_type'] = 'audio/mpeg';
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$info['audio']['lossless'] = false;
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// Calculate playtime
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if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
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$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];
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}
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$info['audio']['encoder_options'] = $this->GuessEncoderOptions();
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return true;
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}
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public function GuessEncoderOptions() {
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// shortcuts
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$info = &$this->getid3->info;
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if (!empty($info['mpeg']['audio'])) {
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$thisfile_mpeg_audio = &$info['mpeg']['audio'];
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if (!empty($thisfile_mpeg_audio['LAME'])) {
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$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
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}
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}
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$encoder_options = '';
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static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
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if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
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$encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
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} elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) {
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$encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
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} elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
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static $KnownEncoderValues = array();
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if (empty($KnownEncoderValues)) {
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//$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
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$KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
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$KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
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$KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
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$KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
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$KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
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$KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
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$KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
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$KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
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$KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
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$KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
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$KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
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$KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
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$KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
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$KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
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$KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
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$KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
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$KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
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$KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
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$KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
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$KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
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$KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
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$KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
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$KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
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$KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
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$KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
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$KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
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$KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
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$KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
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$KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
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$KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
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$KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
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$KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
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$KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
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$KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
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$KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
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$KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
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$KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
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$KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
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$KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
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$KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
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$KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
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$KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
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$KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
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$KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
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$KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
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$KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
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$KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
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$KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
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$KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
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$KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
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}
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if (isset($KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {
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$encoder_options = $KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
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} elseif (isset($KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {
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$encoder_options = $KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
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} elseif ($info['audio']['bitrate_mode'] == 'vbr') {
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// http://gabriel.mp3-tech.org/mp3infotag.html
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// int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
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$LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
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$LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
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$encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value;
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} elseif ($info['audio']['bitrate_mode'] == 'cbr') {
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$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
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} else {
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$encoder_options = strtoupper($info['audio']['bitrate_mode']);
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}
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} elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
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$encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
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} elseif (!empty($info['audio']['bitrate'])) {
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if ($info['audio']['bitrate_mode'] == 'cbr') {
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$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
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} else {
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$encoder_options = strtoupper($info['audio']['bitrate_mode']);
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}
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}
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if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
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$encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
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}
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if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
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$encoder_options .= ' --nogap';
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}
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if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
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$ExplodedOptions = explode(' ', $encoder_options, 4);
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if ($ExplodedOptions[0] == '--r3mix') {
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$ExplodedOptions[1] = 'r3mix';
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}
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switch ($ExplodedOptions[0]) {
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case '--preset':
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case '--alt-preset':
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case '--r3mix':
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if ($ExplodedOptions[1] == 'fast') {
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$ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
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}
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switch ($ExplodedOptions[1]) {
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case 'portable':
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case 'medium':
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case 'standard':
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case 'extreme':
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case 'insane':
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case 'fast portable':
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case 'fast medium':
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case 'fast standard':
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case 'fast extreme':
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case 'fast insane':
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case 'r3mix':
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static $ExpectedLowpass = array(
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'insane|20500' => 20500,
|
|
'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
|
|
'medium|18000' => 18000,
|
|
'fast medium|18000' => 18000,
|
|
'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
|
|
'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
|
|
'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
|
|
'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
|
|
'standard|19000' => 19000,
|
|
'fast standard|19000' => 19000,
|
|
'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
|
|
'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
|
|
'r3mix|18000' => 18000, // 3.94, 3.95
|
|
);
|
|
if (!isset($ExpectedLowpass[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000))) {
|
|
$encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
|
|
if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
|
|
$encoder_options .= ' --resample 44100';
|
|
} elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
|
|
$encoder_options .= ' --resample 48000';
|
|
} elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
|
|
switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
|
|
case 0: // <= 32000
|
|
// may or may not be same as source frequency - ignore
|
|
break;
|
|
case 1: // 44100
|
|
case 2: // 48000
|
|
case 3: // 48000+
|
|
$ExplodedOptions = explode(' ', $encoder_options, 4);
|
|
switch ($ExplodedOptions[0]) {
|
|
case '--preset':
|
|
case '--alt-preset':
|
|
switch ($ExplodedOptions[1]) {
|
|
case 'fast':
|
|
case 'portable':
|
|
case 'medium':
|
|
case 'standard':
|
|
case 'extreme':
|
|
case 'insane':
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
|
|
break;
|
|
|
|
default:
|
|
static $ExpectedResampledRate = array(
|
|
'phon+/lw/mw-eu/sw|16000' => 16000,
|
|
'mw-us|24000' => 24000, // 3.95
|
|
'mw-us|32000' => 32000, // 3.93
|
|
'mw-us|16000' => 16000, // 3.92
|
|
'phone|16000' => 16000,
|
|
'phone|11025' => 11025, // 3.94a15
|
|
'radio|32000' => 32000, // 3.94a15
|
|
'fm/radio|32000' => 32000, // 3.92
|
|
'fm|32000' => 32000, // 3.90
|
|
'voice|32000' => 32000);
|
|
if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case '--r3mix':
|
|
default:
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
|
|
//$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']);
|
|
}
|
|
|
|
return $encoder_options;
|
|
}
|
|
|
|
|
|
public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
|
|
static $MPEGaudioVersionLookup;
|
|
static $MPEGaudioLayerLookup;
|
|
static $MPEGaudioBitrateLookup;
|
|
static $MPEGaudioFrequencyLookup;
|
|
static $MPEGaudioChannelModeLookup;
|
|
static $MPEGaudioModeExtensionLookup;
|
|
static $MPEGaudioEmphasisLookup;
|
|
if (empty($MPEGaudioVersionLookup)) {
|
|
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
|
|
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
|
|
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
|
|
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
|
|
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
|
|
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
|
|
$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
|
|
}
|
|
|
|
if (fseek($this->getid3->fp, $offset, SEEK_SET) != 0) {
|
|
$info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at '.$offset;
|
|
return false;
|
|
}
|
|
//$headerstring = fread($this->getid3->fp, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
|
|
$headerstring = fread($this->getid3->fp, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
|
|
|
|
// MP3 audio frame structure:
|
|
// $aa $aa $aa $aa [$bb $bb] $cc...
|
|
// where $aa..$aa is the four-byte mpeg-audio header (below)
|
|
// $bb $bb is the optional 2-byte CRC
|
|
// and $cc... is the audio data
|
|
|
|
$head4 = substr($headerstring, 0, 4);
|
|
|
|
static $MPEGaudioHeaderDecodeCache = array();
|
|
if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
|
|
$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
|
|
} else {
|
|
$MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
|
|
$MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
|
|
}
|
|
|
|
static $MPEGaudioHeaderValidCache = array();
|
|
if (!isset($MPEGaudioHeaderValidCache[$head4])) { // Not in cache
|
|
//$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
|
|
$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
|
|
}
|
|
|
|
// shortcut
|
|
if (!isset($info['mpeg']['audio'])) {
|
|
$info['mpeg']['audio'] = array();
|
|
}
|
|
$thisfile_mpeg_audio = &$info['mpeg']['audio'];
|
|
|
|
|
|
if ($MPEGaudioHeaderValidCache[$head4]) {
|
|
$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
|
|
} else {
|
|
$info['error'][] = 'Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset;
|
|
return false;
|
|
}
|
|
|
|
if (!$FastMPEGheaderScan) {
|
|
$thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
|
|
$thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
|
|
|
|
$thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
|
|
$thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
|
|
$thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
|
|
$thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
|
|
$thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
|
|
$thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
|
|
$thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
|
|
$thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
|
|
$thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
|
|
|
|
$info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
|
|
$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
|
|
|
|
if ($thisfile_mpeg_audio['protection']) {
|
|
$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
|
|
}
|
|
}
|
|
|
|
if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
|
|
// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
|
|
$info['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1';
|
|
$thisfile_mpeg_audio['raw']['bitrate'] = 0;
|
|
}
|
|
$thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
|
|
$thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
|
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
|
|
// only skip multiple frame check if free-format bitstream found at beginning of file
|
|
// otherwise is quite possibly simply corrupted data
|
|
$recursivesearch = false;
|
|
}
|
|
|
|
// For Layer 2 there are some combinations of bitrate and mode which are not allowed.
|
|
if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
|
|
|
|
$info['audio']['dataformat'] = 'mp2';
|
|
switch ($thisfile_mpeg_audio['channelmode']) {
|
|
|
|
case 'mono':
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
|
|
// these are ok
|
|
} else {
|
|
$info['error'][] = $thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case 'stereo':
|
|
case 'joint stereo':
|
|
case 'dual channel':
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
|
|
// these are ok
|
|
} else {
|
|
$info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
if ($info['audio']['sample_rate'] > 0) {
|
|
$thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
|
|
}
|
|
|
|
$nextframetestoffset = $offset + 1;
|
|
if ($thisfile_mpeg_audio['bitrate'] != 'free') {
|
|
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
|
|
|
|
if (isset($thisfile_mpeg_audio['framelength'])) {
|
|
$nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
|
|
} else {
|
|
$info['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.';
|
|
return false;
|
|
}
|
|
|
|
}
|
|
|
|
$ExpectedNumberOfAudioBytes = 0;
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////
|
|
// Variable-bitrate headers
|
|
|
|
if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
|
|
// Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
|
|
// specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
|
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
|
|
$thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
|
|
$info['audio']['codec'] = 'Fraunhofer';
|
|
|
|
$SideInfoData = substr($headerstring, 4 + 2, 32);
|
|
|
|
$FraunhoferVBROffset = 36;
|
|
|
|
$thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion
|
|
$thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay
|
|
$thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality
|
|
$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
|
|
$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
|
|
$thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
|
|
$thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
|
|
$thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
|
|
$thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames
|
|
|
|
$ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
|
|
|
|
$previousbyteoffset = $offset;
|
|
for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
|
|
$Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
|
|
$FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
|
|
$thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
|
|
$thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
|
|
$previousbyteoffset += $Fraunhofer_OffsetN;
|
|
}
|
|
|
|
|
|
} else {
|
|
|
|
// Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
|
|
// depending on MPEG layer and number of channels
|
|
|
|
$VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
|
|
$SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
|
|
|
|
if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
|
|
// 'Xing' is traditional Xing VBR frame
|
|
// 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
|
|
// 'Info' *can* legally be used to specify a VBR file as well, however.
|
|
|
|
// http://www.multiweb.cz/twoinches/MP3inside.htm
|
|
//00..03 = "Xing" or "Info"
|
|
//04..07 = Flags:
|
|
// 0x01 Frames Flag set if value for number of frames in file is stored
|
|
// 0x02 Bytes Flag set if value for filesize in bytes is stored
|
|
// 0x04 TOC Flag set if values for TOC are stored
|
|
// 0x08 VBR Scale Flag set if values for VBR scale is stored
|
|
//08..11 Frames: Number of frames in file (including the first Xing/Info one)
|
|
//12..15 Bytes: File length in Bytes
|
|
//16..115 TOC (Table of Contents):
|
|
// Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
|
|
// Each Byte has a value according this formula:
|
|
// (TOC[i] / 256) * fileLenInBytes
|
|
// So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
|
|
// TOC[(60/240)*100] = TOC[25]
|
|
// and corresponding Byte in file is then approximately at:
|
|
// (TOC[25]/256) * 5000000
|
|
//116..119 VBR Scale
|
|
|
|
|
|
// should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
|
|
// if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
|
|
$thisfile_mpeg_audio['VBR_method'] = 'Xing';
|
|
// } else {
|
|
// $ScanAsCBR = true;
|
|
// $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
|
|
// }
|
|
|
|
$thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
|
|
|
|
$thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
|
|
$thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
|
|
$thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
|
|
$thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
|
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['frames']) {
|
|
$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4));
|
|
//$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
|
|
}
|
|
if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
|
|
$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
|
|
}
|
|
|
|
//if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
|
|
if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
|
|
|
|
$framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];
|
|
|
|
if ($thisfile_mpeg_audio['layer'] == '1') {
|
|
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
|
|
//$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
|
|
$info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
|
|
} else {
|
|
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
|
|
//$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
|
|
$info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
|
|
}
|
|
$thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
|
|
}
|
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['toc']) {
|
|
$LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
|
|
for ($i = 0; $i < 100; $i++) {
|
|
$thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i});
|
|
}
|
|
}
|
|
if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
|
|
$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
|
|
}
|
|
|
|
|
|
// http://gabriel.mp3-tech.org/mp3infotag.html
|
|
if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
|
|
|
|
// shortcut
|
|
$thisfile_mpeg_audio['LAME'] = array();
|
|
$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
|
|
|
|
|
|
$thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20);
|
|
$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
|
|
|
|
if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
|
|
|
|
// extra 11 chars are not part of version string when LAMEtag present
|
|
unset($thisfile_mpeg_audio_lame['long_version']);
|
|
|
|
// It the LAME tag was only introduced in LAME v3.90
|
|
// http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
|
|
|
|
// Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
|
|
// are assuming a 'Xing' identifier offset of 0x24, which is the case for
|
|
// MPEG-1 non-mono, but not for other combinations
|
|
$LAMEtagOffsetContant = $VBRidOffset - 0x24;
|
|
|
|
// shortcuts
|
|
$thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array());
|
|
$thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD'];
|
|
$thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
|
|
$thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
|
|
$thisfile_mpeg_audio_lame['raw'] = array();
|
|
$thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
|
|
|
|
// byte $9B VBR Quality
|
|
// This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
|
|
// Actually overwrites original Xing bytes
|
|
unset($thisfile_mpeg_audio['VBR_scale']);
|
|
$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
|
|
|
|
// bytes $9C-$A4 Encoder short VersionString
|
|
$thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
|
|
|
|
// byte $A5 Info Tag revision + VBR method
|
|
$LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
|
|
|
|
$thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
|
|
$thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
|
|
$thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
|
|
$thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
|
|
|
|
// byte $A6 Lowpass filter value
|
|
$thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
|
|
|
|
// bytes $A7-$AE Replay Gain
|
|
// http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
|
|
// bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
|
|
if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
|
|
// LAME 3.94a16 and later - 9.23 fixed point
|
|
// ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
|
|
$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
|
|
} else {
|
|
// LAME 3.94a15 and earlier - 32-bit floating point
|
|
// Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
|
|
$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
|
|
}
|
|
if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
|
|
unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
|
|
} else {
|
|
$thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
|
|
}
|
|
|
|
$thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
|
|
$thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
|
|
|
|
|
|
if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
|
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
|
|
$thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
|
|
$thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
|
|
$thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
|
|
$thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
|
|
$thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
|
|
$thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
|
|
|
|
if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
|
|
$info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
|
|
}
|
|
$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
|
|
$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
|
|
} else {
|
|
unset($thisfile_mpeg_audio_lame_RGAD['track']);
|
|
}
|
|
if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
|
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
|
|
$thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
|
|
$thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
|
|
$thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
|
|
$thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
|
|
$thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
|
|
$thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
|
|
|
|
if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
|
|
$info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
|
|
}
|
|
$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
|
|
$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
|
|
} else {
|
|
unset($thisfile_mpeg_audio_lame_RGAD['album']);
|
|
}
|
|
if (empty($thisfile_mpeg_audio_lame_RGAD)) {
|
|
unset($thisfile_mpeg_audio_lame['RGAD']);
|
|
}
|
|
|
|
|
|
// byte $AF Encoding flags + ATH Type
|
|
$EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10);
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40);
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80);
|
|
$thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F;
|
|
|
|
// byte $B0 if ABR {specified bitrate} else {minimal bitrate}
|
|
$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
|
|
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
|
|
$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
|
|
} elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
|
|
// ignore
|
|
} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
|
|
$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
|
|
}
|
|
|
|
// bytes $B1-$B3 Encoder delays
|
|
$EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
|
|
$thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
|
|
$thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF;
|
|
|
|
// byte $B4 Misc
|
|
$MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
|
|
$thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03);
|
|
$thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
|
|
$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
|
|
$thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
|
|
$thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
|
|
$thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
|
|
$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
|
|
$thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
|
|
|
|
// byte $B5 MP3 Gain
|
|
$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
|
|
$thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
|
|
$thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
|
|
|
|
// bytes $B6-$B7 Preset and surround info
|
|
$PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
|
|
// Reserved = ($PresetSurroundBytes & 0xC000);
|
|
$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
|
|
$thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
|
|
$thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
|
|
$thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
|
|
if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
|
|
$info['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org';
|
|
}
|
|
if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
|
|
// this may change if 3.90.4 ever comes out
|
|
$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
|
|
}
|
|
|
|
// bytes $B8-$BB MusicLength
|
|
$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
|
|
$ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
|
|
|
|
// bytes $BC-$BD MusicCRC
|
|
$thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
|
|
|
|
// bytes $BE-$BF CRC-16 of Info Tag
|
|
$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
|
|
|
|
|
|
// LAME CBR
|
|
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
|
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
|
|
$thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
|
|
//if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
|
|
// $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
|
|
//}
|
|
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
} else {
|
|
|
|
// not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
|
|
if ($recursivesearch) {
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
|
|
if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
|
|
$recursivesearch = false;
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
|
|
}
|
|
if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
|
|
$info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
|
|
if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
|
|
if (isset($info['fileformat']) && ($info['fileformat'] == 'riff')) {
|
|
// ignore, audio data is broken into chunks so will always be data "missing"
|
|
} elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
|
|
$info['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)';
|
|
} else {
|
|
$info['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)';
|
|
}
|
|
} else {
|
|
if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
|
|
// $prenullbytefileoffset = ftell($this->getid3->fp);
|
|
// fseek($this->getid3->fp, $info['avdataend'], SEEK_SET);
|
|
// $PossibleNullByte = fread($this->getid3->fp, 1);
|
|
// fseek($this->getid3->fp, $prenullbytefileoffset, SEEK_SET);
|
|
// if ($PossibleNullByte === "\x00") {
|
|
$info['avdataend']--;
|
|
// $info['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored';
|
|
// } else {
|
|
// $info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
|
|
// }
|
|
} else {
|
|
$info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
|
|
}
|
|
}
|
|
}
|
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
|
|
if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
|
|
$framebytelength = $this->FreeFormatFrameLength($offset, true);
|
|
if ($framebytelength > 0) {
|
|
$thisfile_mpeg_audio['framelength'] = $framebytelength;
|
|
if ($thisfile_mpeg_audio['layer'] == '1') {
|
|
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
|
|
$info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
|
|
} else {
|
|
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
|
|
$info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
|
|
}
|
|
} else {
|
|
$info['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
|
|
}
|
|
}
|
|
}
|
|
|
|
if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
|
|
switch ($thisfile_mpeg_audio['bitrate_mode']) {
|
|
case 'vbr':
|
|
case 'abr':
|
|
$bytes_per_frame = 1152;
|
|
if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
|
|
$bytes_per_frame = 384;
|
|
} elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
|
|
$bytes_per_frame = 576;
|
|
}
|
|
$thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
|
|
if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
|
|
$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// End variable-bitrate headers
|
|
////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
if ($recursivesearch) {
|
|
|
|
if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
|
|
return false;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
//if (false) {
|
|
// // experimental side info parsing section - not returning anything useful yet
|
|
//
|
|
// $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
|
|
// $SideInfoOffset = 0;
|
|
//
|
|
// if ($thisfile_mpeg_audio['version'] == '1') {
|
|
// if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
|
|
// // MPEG-1 (mono)
|
|
// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
|
|
// $SideInfoOffset += 9;
|
|
// $SideInfoOffset += 5;
|
|
// } else {
|
|
// // MPEG-1 (stereo, joint-stereo, dual-channel)
|
|
// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
|
|
// $SideInfoOffset += 9;
|
|
// $SideInfoOffset += 3;
|
|
// }
|
|
// } else { // 2 or 2.5
|
|
// if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
|
|
// // MPEG-2, MPEG-2.5 (mono)
|
|
// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
|
|
// $SideInfoOffset += 8;
|
|
// $SideInfoOffset += 1;
|
|
// } else {
|
|
// // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
|
|
// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
|
|
// $SideInfoOffset += 8;
|
|
// $SideInfoOffset += 2;
|
|
// }
|
|
// }
|
|
//
|
|
// if ($thisfile_mpeg_audio['version'] == '1') {
|
|
// for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
|
|
// for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
|
|
// $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
|
|
// $SideInfoOffset += 2;
|
|
// }
|
|
// }
|
|
// }
|
|
// for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
|
|
// for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
|
|
// $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
|
|
// $SideInfoOffset += 12;
|
|
// $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
|
|
// $SideInfoOffset += 9;
|
|
// $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
|
|
// $SideInfoOffset += 8;
|
|
// if ($thisfile_mpeg_audio['version'] == '1') {
|
|
// $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
|
|
// $SideInfoOffset += 4;
|
|
// } else {
|
|
// $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
|
|
// $SideInfoOffset += 9;
|
|
// }
|
|
// $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
|
|
// $SideInfoOffset += 1;
|
|
//
|
|
// if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
|
|
//
|
|
// $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
|
|
// $SideInfoOffset += 2;
|
|
// $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
|
|
// $SideInfoOffset += 1;
|
|
//
|
|
// for ($region = 0; $region < 2; $region++) {
|
|
// $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
|
|
// $SideInfoOffset += 5;
|
|
// }
|
|
// $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
|
|
//
|
|
// for ($window = 0; $window < 3; $window++) {
|
|
// $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
|
|
// $SideInfoOffset += 3;
|
|
// }
|
|
//
|
|
// } else {
|
|
//
|
|
// for ($region = 0; $region < 3; $region++) {
|
|
// $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
|
|
// $SideInfoOffset += 5;
|
|
// }
|
|
//
|
|
// $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
|
|
// $SideInfoOffset += 4;
|
|
// $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
|
|
// $SideInfoOffset += 3;
|
|
// $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
|
|
// }
|
|
//
|
|
// if ($thisfile_mpeg_audio['version'] == '1') {
|
|
// $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
|
|
// $SideInfoOffset += 1;
|
|
// }
|
|
// $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
|
|
// $SideInfoOffset += 1;
|
|
// $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
|
|
// $SideInfoOffset += 1;
|
|
// }
|
|
// }
|
|
//}
|
|
|
|
return true;
|
|
}
|
|
|
|
public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) {
|
|
$info = &$this->getid3->info;
|
|
$firstframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
|
|
$this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
|
|
|
|
for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
|
|
// check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
|
|
if (($nextframetestoffset + 4) >= $info['avdataend']) {
|
|
// end of file
|
|
return true;
|
|
}
|
|
|
|
$nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
|
|
if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
|
|
if ($ScanAsCBR) {
|
|
// force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
|
|
if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
// next frame is OK, get ready to check the one after that
|
|
if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
|
|
$nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
|
|
} else {
|
|
$info['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
|
|
return false;
|
|
}
|
|
|
|
} elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
|
|
|
|
// it's not the end of the file, but there's not enough data left for another frame, so assume it's garbage/padding and return OK
|
|
return true;
|
|
|
|
} else {
|
|
|
|
// next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
|
|
$info['warning'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';
|
|
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
public function FreeFormatFrameLength($offset, $deepscan=false) {
|
|
$info = &$this->getid3->info;
|
|
|
|
fseek($this->getid3->fp, $offset, SEEK_SET);
|
|
$MPEGaudioData = fread($this->getid3->fp, 32768);
|
|
|
|
$SyncPattern1 = substr($MPEGaudioData, 0, 4);
|
|
// may be different pattern due to padding
|
|
$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3};
|
|
if ($SyncPattern2 === $SyncPattern1) {
|
|
$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3};
|
|
}
|
|
|
|
$framelength = false;
|
|
$framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
|
|
$framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
|
|
if ($framelength1 > 4) {
|
|
$framelength = $framelength1;
|
|
}
|
|
if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
|
|
$framelength = $framelength2;
|
|
}
|
|
if (!$framelength) {
|
|
|
|
// LAME 3.88 has a different value for modeextension on the first frame vs the rest
|
|
$framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
|
|
$framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
|
|
|
|
if ($framelength1 > 4) {
|
|
$framelength = $framelength1;
|
|
}
|
|
if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
|
|
$framelength = $framelength2;
|
|
}
|
|
if (!$framelength) {
|
|
$info['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
|
|
return false;
|
|
} else {
|
|
$info['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
|
|
$info['audio']['codec'] = 'LAME';
|
|
$info['audio']['encoder'] = 'LAME3.88';
|
|
$SyncPattern1 = substr($SyncPattern1, 0, 3);
|
|
$SyncPattern2 = substr($SyncPattern2, 0, 3);
|
|
}
|
|
}
|
|
|
|
if ($deepscan) {
|
|
|
|
$ActualFrameLengthValues = array();
|
|
$nextoffset = $offset + $framelength;
|
|
while ($nextoffset < ($info['avdataend'] - 6)) {
|
|
fseek($this->getid3->fp, $nextoffset - 1, SEEK_SET);
|
|
$NextSyncPattern = fread($this->getid3->fp, 6);
|
|
if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
|
|
// good - found where expected
|
|
$ActualFrameLengthValues[] = $framelength;
|
|
} elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
|
|
// ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
|
|
$ActualFrameLengthValues[] = ($framelength - 1);
|
|
$nextoffset--;
|
|
} elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
|
|
// ok - found one byte later than expected (last frame was padded, first frame wasn't)
|
|
$ActualFrameLengthValues[] = ($framelength + 1);
|
|
$nextoffset++;
|
|
} else {
|
|
$info['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
|
|
return false;
|
|
}
|
|
$nextoffset += $framelength;
|
|
}
|
|
if (count($ActualFrameLengthValues) > 0) {
|
|
$framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
|
|
}
|
|
}
|
|
return $framelength;
|
|
}
|
|
|
|
public function getOnlyMPEGaudioInfoBruteForce() {
|
|
$MPEGaudioHeaderDecodeCache = array();
|
|
$MPEGaudioHeaderValidCache = array();
|
|
$MPEGaudioHeaderLengthCache = array();
|
|
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
|
|
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
|
|
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
|
|
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
|
|
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
|
|
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
|
|
$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
|
|
$LongMPEGversionLookup = array();
|
|
$LongMPEGlayerLookup = array();
|
|
$LongMPEGbitrateLookup = array();
|
|
$LongMPEGpaddingLookup = array();
|
|
$LongMPEGfrequencyLookup = array();
|
|
$Distribution['bitrate'] = array();
|
|
$Distribution['frequency'] = array();
|
|
$Distribution['layer'] = array();
|
|
$Distribution['version'] = array();
|
|
$Distribution['padding'] = array();
|
|
|
|
$info = &$this->getid3->info;
|
|
fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
|
|
|
|
$max_frames_scan = 5000;
|
|
$frames_scanned = 0;
|
|
|
|
$previousvalidframe = $info['avdataoffset'];
|
|
while (ftell($this->getid3->fp) < $info['avdataend']) {
|
|
set_time_limit(30);
|
|
$head4 = fread($this->getid3->fp, 4);
|
|
if (strlen($head4) < 4) {
|
|
break;
|
|
}
|
|
if ($head4{0} != "\xFF") {
|
|
for ($i = 1; $i < 4; $i++) {
|
|
if ($head4{$i} == "\xFF") {
|
|
fseek($this->getid3->fp, $i - 4, SEEK_CUR);
|
|
continue 2;
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
|
|
$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
|
|
}
|
|
if (!isset($MPEGaudioHeaderValidCache[$head4])) {
|
|
$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
|
|
}
|
|
if ($MPEGaudioHeaderValidCache[$head4]) {
|
|
|
|
if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
|
|
$LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
|
|
$LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
|
|
$LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
|
|
$LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
|
|
$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
|
|
$MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
|
|
$LongMPEGbitrateLookup[$head4],
|
|
$LongMPEGversionLookup[$head4],
|
|
$LongMPEGlayerLookup[$head4],
|
|
$LongMPEGpaddingLookup[$head4],
|
|
$LongMPEGfrequencyLookup[$head4]);
|
|
}
|
|
if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
|
|
$WhereWeWere = ftell($this->getid3->fp);
|
|
fseek($this->getid3->fp, $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
|
|
$next4 = fread($this->getid3->fp, 4);
|
|
if ($next4{0} == "\xFF") {
|
|
if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
|
|
$MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
|
|
}
|
|
if (!isset($MPEGaudioHeaderValidCache[$next4])) {
|
|
$MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
|
|
}
|
|
if ($MPEGaudioHeaderValidCache[$next4]) {
|
|
fseek($this->getid3->fp, -4, SEEK_CUR);
|
|
|
|
getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]);
|
|
getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]);
|
|
getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]);
|
|
getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]);
|
|
getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]);
|
|
if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
|
|
$pct_data_scanned = (ftell($this->getid3->fp) - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
|
|
$info['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
|
|
foreach ($Distribution as $key1 => $value1) {
|
|
foreach ($value1 as $key2 => $value2) {
|
|
$Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
unset($next4);
|
|
fseek($this->getid3->fp, $WhereWeWere - 3, SEEK_SET);
|
|
}
|
|
|
|
}
|
|
}
|
|
foreach ($Distribution as $key => $value) {
|
|
ksort($Distribution[$key], SORT_NUMERIC);
|
|
}
|
|
ksort($Distribution['version'], SORT_STRING);
|
|
$info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
|
|
$info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
|
|
$info['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
|
|
$info['mpeg']['audio']['version_distribution'] = $Distribution['version'];
|
|
$info['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
|
|
if (count($Distribution['version']) > 1) {
|
|
$info['error'][] = 'Corrupt file - more than one MPEG version detected';
|
|
}
|
|
if (count($Distribution['layer']) > 1) {
|
|
$info['error'][] = 'Corrupt file - more than one MPEG layer detected';
|
|
}
|
|
if (count($Distribution['frequency']) > 1) {
|
|
$info['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
|
|
}
|
|
|
|
|
|
$bittotal = 0;
|
|
foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
|
|
if ($bitratevalue != 'free') {
|
|
$bittotal += ($bitratevalue * $bitratecount);
|
|
}
|
|
}
|
|
$info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
|
|
if ($info['mpeg']['audio']['frame_count'] == 0) {
|
|
$info['error'][] = 'no MPEG audio frames found';
|
|
return false;
|
|
}
|
|
$info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']);
|
|
$info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
|
|
$info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
|
|
|
|
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
|
|
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
|
|
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
|
|
$info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
|
|
$info['fileformat'] = $info['audio']['dataformat'];
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) {
|
|
// looks for synch, decodes MPEG audio header
|
|
|
|
$info = &$this->getid3->info;
|
|
|
|
static $MPEGaudioVersionLookup;
|
|
static $MPEGaudioLayerLookup;
|
|
static $MPEGaudioBitrateLookup;
|
|
if (empty($MPEGaudioVersionLookup)) {
|
|
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
|
|
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
|
|
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
|
|
|
|
}
|
|
|
|
fseek($this->getid3->fp, $avdataoffset, SEEK_SET);
|
|
$sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset);
|
|
if ($sync_seek_buffer_size <= 0) {
|
|
$info['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset;
|
|
return false;
|
|
}
|
|
$header = fread($this->getid3->fp, $sync_seek_buffer_size);
|
|
$sync_seek_buffer_size = strlen($header);
|
|
$SynchSeekOffset = 0;
|
|
while ($SynchSeekOffset < $sync_seek_buffer_size) {
|
|
if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) {
|
|
|
|
if ($SynchSeekOffset > $sync_seek_buffer_size) {
|
|
// if a synch's not found within the first 128k bytes, then give up
|
|
$info['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB';
|
|
if (isset($info['audio']['bitrate'])) {
|
|
unset($info['audio']['bitrate']);
|
|
}
|
|
if (isset($info['mpeg']['audio'])) {
|
|
unset($info['mpeg']['audio']);
|
|
}
|
|
if (empty($info['mpeg'])) {
|
|
unset($info['mpeg']);
|
|
}
|
|
return false;
|
|
|
|
} elseif (feof($this->getid3->fp)) {
|
|
|
|
$info['error'][] = 'Could not find valid MPEG audio synch before end of file';
|
|
if (isset($info['audio']['bitrate'])) {
|
|
unset($info['audio']['bitrate']);
|
|
}
|
|
if (isset($info['mpeg']['audio'])) {
|
|
unset($info['mpeg']['audio']);
|
|
}
|
|
if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) {
|
|
unset($info['mpeg']);
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (($SynchSeekOffset + 1) >= strlen($header)) {
|
|
$info['error'][] = 'Could not find valid MPEG synch before end of file';
|
|
return false;
|
|
}
|
|
|
|
if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected
|
|
if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
|
|
$FirstFrameThisfileInfo = $info;
|
|
$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
|
|
if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) {
|
|
// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
|
|
// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
|
|
unset($FirstFrameThisfileInfo);
|
|
}
|
|
}
|
|
|
|
$dummy = $info; // only overwrite real data if valid header found
|
|
if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
|
|
$info = $dummy;
|
|
$info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
|
|
switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
|
|
case '':
|
|
case 'id3':
|
|
case 'ape':
|
|
case 'mp3':
|
|
$info['fileformat'] = 'mp3';
|
|
$info['audio']['dataformat'] = 'mp3';
|
|
break;
|
|
}
|
|
if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
|
|
if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
|
|
// If there is garbage data between a valid VBR header frame and a sequence
|
|
// of valid MPEG-audio frames the VBR data is no longer discarded.
|
|
$info = $FirstFrameThisfileInfo;
|
|
$info['avdataoffset'] = $FirstFrameAVDataOffset;
|
|
$info['fileformat'] = 'mp3';
|
|
$info['audio']['dataformat'] = 'mp3';
|
|
$dummy = $info;
|
|
unset($dummy['mpeg']['audio']);
|
|
$GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
|
|
$GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
|
|
if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) {
|
|
$info = $dummy;
|
|
$info['avdataoffset'] = $GarbageOffsetEnd;
|
|
$info['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
|
|
} else {
|
|
$info['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
|
|
}
|
|
}
|
|
}
|
|
if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
|
|
// VBR file with no VBR header
|
|
$BitrateHistogram = true;
|
|
}
|
|
|
|
if ($BitrateHistogram) {
|
|
|
|
$info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
|
|
$info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
|
|
|
|
if ($info['mpeg']['audio']['version'] == '1') {
|
|
if ($info['mpeg']['audio']['layer'] == 3) {
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
|
|
} elseif ($info['mpeg']['audio']['layer'] == 2) {
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
|
|
} elseif ($info['mpeg']['audio']['layer'] == 1) {
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
|
|
}
|
|
} elseif ($info['mpeg']['audio']['layer'] == 1) {
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0);
|
|
} else {
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0);
|
|
}
|
|
|
|
$dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
|
|
$synchstartoffset = $info['avdataoffset'];
|
|
fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
|
|
|
|
// you can play with these numbers:
|
|
$max_frames_scan = 50000;
|
|
$max_scan_segments = 10;
|
|
|
|
// don't play with these numbers:
|
|
$FastMode = false;
|
|
$SynchErrorsFound = 0;
|
|
$frames_scanned = 0;
|
|
$this_scan_segment = 0;
|
|
$frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
|
|
$pct_data_scanned = 0;
|
|
for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
|
|
$frames_scanned_this_segment = 0;
|
|
if (ftell($this->getid3->fp) >= $info['avdataend']) {
|
|
break;
|
|
}
|
|
$scan_start_offset[$current_segment] = max(ftell($this->getid3->fp), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
|
|
if ($current_segment > 0) {
|
|
fseek($this->getid3->fp, $scan_start_offset[$current_segment], SEEK_SET);
|
|
$buffer_4k = fread($this->getid3->fp, 4096);
|
|
for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
|
|
if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected
|
|
if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
|
|
$calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
|
|
if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) {
|
|
$scan_start_offset[$current_segment] += $j;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
$synchstartoffset = $scan_start_offset[$current_segment];
|
|
while ($this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) {
|
|
$FastMode = true;
|
|
$thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
|
|
|
|
if (empty($dummy['mpeg']['audio']['framelength'])) {
|
|
$SynchErrorsFound++;
|
|
$synchstartoffset++;
|
|
} else {
|
|
getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
|
|
getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
|
|
getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
|
|
$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
|
|
}
|
|
$frames_scanned++;
|
|
if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
|
|
$this_pct_scanned = (ftell($this->getid3->fp) - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']);
|
|
if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
|
|
// file likely contains < $max_frames_scan, just scan as one segment
|
|
$max_scan_segments = 1;
|
|
$frames_scan_per_segment = $max_frames_scan;
|
|
} else {
|
|
$pct_data_scanned += $this_pct_scanned;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if ($pct_data_scanned > 0) {
|
|
$info['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
|
|
foreach ($info['mpeg']['audio'] as $key1 => $value1) {
|
|
if (!preg_match('#_distribution$#i', $key1)) {
|
|
continue;
|
|
}
|
|
foreach ($value1 as $key2 => $value2) {
|
|
$info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($SynchErrorsFound > 0) {
|
|
$info['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
|
|
//return false;
|
|
}
|
|
|
|
$bittotal = 0;
|
|
$framecounter = 0;
|
|
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
|
|
$framecounter += $bitratecount;
|
|
if ($bitratevalue != 'free') {
|
|
$bittotal += ($bitratevalue * $bitratecount);
|
|
}
|
|
}
|
|
if ($framecounter == 0) {
|
|
$info['error'][] = 'Corrupt MP3 file: framecounter == zero';
|
|
return false;
|
|
}
|
|
$info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
|
|
$info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
|
|
|
|
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
|
|
|
|
|
|
// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
|
|
$distinct_bitrates = 0;
|
|
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
|
|
if ($bitrate_count > 0) {
|
|
$distinct_bitrates++;
|
|
}
|
|
}
|
|
if ($distinct_bitrates > 1) {
|
|
$info['mpeg']['audio']['bitrate_mode'] = 'vbr';
|
|
} else {
|
|
$info['mpeg']['audio']['bitrate_mode'] = 'cbr';
|
|
}
|
|
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
|
|
|
|
}
|
|
|
|
break; // exit while()
|
|
}
|
|
}
|
|
|
|
$SynchSeekOffset++;
|
|
if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
|
|
// end of file/data
|
|
|
|
if (empty($info['mpeg']['audio'])) {
|
|
|
|
$info['error'][] = 'could not find valid MPEG synch before end of file';
|
|
if (isset($info['audio']['bitrate'])) {
|
|
unset($info['audio']['bitrate']);
|
|
}
|
|
if (isset($info['mpeg']['audio'])) {
|
|
unset($info['mpeg']['audio']);
|
|
}
|
|
if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
|
|
unset($info['mpeg']);
|
|
}
|
|
return false;
|
|
|
|
}
|
|
break;
|
|
}
|
|
|
|
}
|
|
$info['audio']['channels'] = $info['mpeg']['audio']['channels'];
|
|
$info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
|
|
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
|
|
return true;
|
|
}
|
|
|
|
|
|
public static function MPEGaudioVersionArray() {
|
|
static $MPEGaudioVersion = array('2.5', false, '2', '1');
|
|
return $MPEGaudioVersion;
|
|
}
|
|
|
|
public static function MPEGaudioLayerArray() {
|
|
static $MPEGaudioLayer = array(false, 3, 2, 1);
|
|
return $MPEGaudioLayer;
|
|
}
|
|
|
|
public static function MPEGaudioBitrateArray() {
|
|
static $MPEGaudioBitrate;
|
|
if (empty($MPEGaudioBitrate)) {
|
|
$MPEGaudioBitrate = array (
|
|
'1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
|
|
2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
|
|
3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
|
|
),
|
|
|
|
'2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
|
|
2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
|
|
)
|
|
);
|
|
$MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
|
|
$MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
|
|
}
|
|
return $MPEGaudioBitrate;
|
|
}
|
|
|
|
public static function MPEGaudioFrequencyArray() {
|
|
static $MPEGaudioFrequency;
|
|
if (empty($MPEGaudioFrequency)) {
|
|
$MPEGaudioFrequency = array (
|
|
'1' => array(44100, 48000, 32000),
|
|
'2' => array(22050, 24000, 16000),
|
|
'2.5' => array(11025, 12000, 8000)
|
|
);
|
|
}
|
|
return $MPEGaudioFrequency;
|
|
}
|
|
|
|
public static function MPEGaudioChannelModeArray() {
|
|
static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
|
|
return $MPEGaudioChannelMode;
|
|
}
|
|
|
|
public static function MPEGaudioModeExtensionArray() {
|
|
static $MPEGaudioModeExtension;
|
|
if (empty($MPEGaudioModeExtension)) {
|
|
$MPEGaudioModeExtension = array (
|
|
1 => array('4-31', '8-31', '12-31', '16-31'),
|
|
2 => array('4-31', '8-31', '12-31', '16-31'),
|
|
3 => array('', 'IS', 'MS', 'IS+MS')
|
|
);
|
|
}
|
|
return $MPEGaudioModeExtension;
|
|
}
|
|
|
|
public static function MPEGaudioEmphasisArray() {
|
|
static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
|
|
return $MPEGaudioEmphasis;
|
|
}
|
|
|
|
public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
|
|
return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
|
|
}
|
|
|
|
public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
|
|
if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
|
|
return false;
|
|
}
|
|
|
|
static $MPEGaudioVersionLookup;
|
|
static $MPEGaudioLayerLookup;
|
|
static $MPEGaudioBitrateLookup;
|
|
static $MPEGaudioFrequencyLookup;
|
|
static $MPEGaudioChannelModeLookup;
|
|
static $MPEGaudioModeExtensionLookup;
|
|
static $MPEGaudioEmphasisLookup;
|
|
if (empty($MPEGaudioVersionLookup)) {
|
|
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
|
|
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
|
|
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
|
|
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
|
|
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
|
|
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
|
|
$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
|
|
}
|
|
|
|
if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
|
|
$decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
|
|
} else {
|
|
echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
|
|
return false;
|
|
}
|
|
if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
|
|
$decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
|
|
} else {
|
|
echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
|
|
return false;
|
|
}
|
|
if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
|
|
echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
|
|
if ($rawarray['bitrate'] == 15) {
|
|
// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
|
|
// let it go through here otherwise file will not be identified
|
|
if (!$allowBitrate15) {
|
|
return false;
|
|
}
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
|
|
echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
|
|
return false;
|
|
}
|
|
if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
|
|
echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
|
|
return false;
|
|
}
|
|
if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
|
|
echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
|
|
return false;
|
|
}
|
|
if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
|
|
echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
|
|
return false;
|
|
}
|
|
// These are just either set or not set, you can't mess that up :)
|
|
// $rawarray['protection'];
|
|
// $rawarray['padding'];
|
|
// $rawarray['private'];
|
|
// $rawarray['copyright'];
|
|
// $rawarray['original'];
|
|
|
|
return true;
|
|
}
|
|
|
|
public static function MPEGaudioHeaderDecode($Header4Bytes) {
|
|
// AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
|
|
// A - Frame sync (all bits set)
|
|
// B - MPEG Audio version ID
|
|
// C - Layer description
|
|
// D - Protection bit
|
|
// E - Bitrate index
|
|
// F - Sampling rate frequency index
|
|
// G - Padding bit
|
|
// H - Private bit
|
|
// I - Channel Mode
|
|
// J - Mode extension (Only if Joint stereo)
|
|
// K - Copyright
|
|
// L - Original
|
|
// M - Emphasis
|
|
|
|
if (strlen($Header4Bytes) != 4) {
|
|
return false;
|
|
}
|
|
|
|
$MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
|
|
$MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB
|
|
$MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC
|
|
$MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D
|
|
$MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE
|
|
$MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF
|
|
$MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G
|
|
$MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H
|
|
$MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II
|
|
$MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ
|
|
$MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K
|
|
$MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L
|
|
$MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM
|
|
|
|
return $MPEGrawHeader;
|
|
}
|
|
|
|
public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) {
|
|
static $AudioFrameLengthCache = array();
|
|
|
|
if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
|
|
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
|
|
if ($bitrate != 'free') {
|
|
|
|
if ($version == '1') {
|
|
|
|
if ($layer == '1') {
|
|
|
|
// For Layer I slot is 32 bits long
|
|
$FrameLengthCoefficient = 48;
|
|
$SlotLength = 4;
|
|
|
|
} else { // Layer 2 / 3
|
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long.
|
|
$FrameLengthCoefficient = 144;
|
|
$SlotLength = 1;
|
|
|
|
}
|
|
|
|
} else { // MPEG-2 / MPEG-2.5
|
|
|
|
if ($layer == '1') {
|
|
|
|
// For Layer I slot is 32 bits long
|
|
$FrameLengthCoefficient = 24;
|
|
$SlotLength = 4;
|
|
|
|
} elseif ($layer == '2') {
|
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long.
|
|
$FrameLengthCoefficient = 144;
|
|
$SlotLength = 1;
|
|
|
|
} else { // layer 3
|
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long.
|
|
$FrameLengthCoefficient = 72;
|
|
$SlotLength = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
|
|
if ($samplerate > 0) {
|
|
$NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
|
|
$NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
|
|
if ($padding) {
|
|
$NewFramelength += $SlotLength;
|
|
}
|
|
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
|
|
}
|
|
}
|
|
}
|
|
return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
|
|
}
|
|
|
|
public static function ClosestStandardMP3Bitrate($bit_rate) {
|
|
static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
|
|
static $bit_rate_table = array (0=>'-');
|
|
$round_bit_rate = intval(round($bit_rate, -3));
|
|
if (!isset($bit_rate_table[$round_bit_rate])) {
|
|
if ($round_bit_rate > max($standard_bit_rates)) {
|
|
$bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate));
|
|
} else {
|
|
$bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
|
|
foreach ($standard_bit_rates as $standard_bit_rate) {
|
|
if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
|
|
break;
|
|
}
|
|
$bit_rate_table[$round_bit_rate] = $standard_bit_rate;
|
|
}
|
|
}
|
|
}
|
|
return $bit_rate_table[$round_bit_rate];
|
|
}
|
|
|
|
public static function XingVBRidOffset($version, $channelmode) {
|
|
static $XingVBRidOffsetCache = array();
|
|
if (empty($XingVBRidOffset)) {
|
|
$XingVBRidOffset = array (
|
|
'1' => array ('mono' => 0x15, // 4 + 17 = 21
|
|
'stereo' => 0x24, // 4 + 32 = 36
|
|
'joint stereo' => 0x24,
|
|
'dual channel' => 0x24
|
|
),
|
|
|
|
'2' => array ('mono' => 0x0D, // 4 + 9 = 13
|
|
'stereo' => 0x15, // 4 + 17 = 21
|
|
'joint stereo' => 0x15,
|
|
'dual channel' => 0x15
|
|
),
|
|
|
|
'2.5' => array ('mono' => 0x15,
|
|
'stereo' => 0x15,
|
|
'joint stereo' => 0x15,
|
|
'dual channel' => 0x15
|
|
)
|
|
);
|
|
}
|
|
return $XingVBRidOffset[$version][$channelmode];
|
|
}
|
|
|
|
public static function LAMEvbrMethodLookup($VBRmethodID) {
|
|
static $LAMEvbrMethodLookup = array(
|
|
0x00 => 'unknown',
|
|
0x01 => 'cbr',
|
|
0x02 => 'abr',
|
|
0x03 => 'vbr-old / vbr-rh',
|
|
0x04 => 'vbr-new / vbr-mtrh',
|
|
0x05 => 'vbr-mt',
|
|
0x06 => 'vbr (full vbr method 4)',
|
|
0x08 => 'cbr (constant bitrate 2 pass)',
|
|
0x09 => 'abr (2 pass)',
|
|
0x0F => 'reserved'
|
|
);
|
|
return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
|
|
}
|
|
|
|
public static function LAMEmiscStereoModeLookup($StereoModeID) {
|
|
static $LAMEmiscStereoModeLookup = array(
|
|
0 => 'mono',
|
|
1 => 'stereo',
|
|
2 => 'dual mono',
|
|
3 => 'joint stereo',
|
|
4 => 'forced stereo',
|
|
5 => 'auto',
|
|
6 => 'intensity stereo',
|
|
7 => 'other'
|
|
);
|
|
return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
|
|
}
|
|
|
|
public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
|
|
static $LAMEmiscSourceSampleFrequencyLookup = array(
|
|
0 => '<= 32 kHz',
|
|
1 => '44.1 kHz',
|
|
2 => '48 kHz',
|
|
3 => '> 48kHz'
|
|
);
|
|
return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
|
|
}
|
|
|
|
public static function LAMEsurroundInfoLookup($SurroundInfoID) {
|
|
static $LAMEsurroundInfoLookup = array(
|
|
0 => 'no surround info',
|
|
1 => 'DPL encoding',
|
|
2 => 'DPL2 encoding',
|
|
3 => 'Ambisonic encoding'
|
|
);
|
|
return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
|
|
}
|
|
|
|
public static function LAMEpresetUsedLookup($LAMEtag) {
|
|
|
|
if ($LAMEtag['preset_used_id'] == 0) {
|
|
// no preset used (LAME >=3.93)
|
|
// no preset recorded (LAME <3.93)
|
|
return '';
|
|
}
|
|
$LAMEpresetUsedLookup = array();
|
|
|
|
///// THIS PART CANNOT BE STATIC .
|
|
for ($i = 8; $i <= 320; $i++) {
|
|
switch ($LAMEtag['vbr_method']) {
|
|
case 'cbr':
|
|
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
|
|
break;
|
|
case 'abr':
|
|
default: // other VBR modes shouldn't be here(?)
|
|
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
|
|
|
|
// named alt-presets
|
|
$LAMEpresetUsedLookup[1000] = '--r3mix';
|
|
$LAMEpresetUsedLookup[1001] = '--alt-preset standard';
|
|
$LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
|
|
$LAMEpresetUsedLookup[1003] = '--alt-preset insane';
|
|
$LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
|
|
$LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
|
|
$LAMEpresetUsedLookup[1006] = '--alt-preset medium';
|
|
$LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
|
|
|
|
// LAME 3.94 additions/changes
|
|
$LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
|
|
$LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
|
|
|
|
$LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
|
|
$LAMEpresetUsedLookup[410] = '-V9';
|
|
$LAMEpresetUsedLookup[420] = '-V8';
|
|
$LAMEpresetUsedLookup[440] = '-V6';
|
|
$LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
|
|
$LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
|
|
$LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
|
|
$LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
|
|
$LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
|
|
$LAMEpresetUsedLookup[490] = '-V1';
|
|
$LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
|
|
|
|
return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
|
|
}
|
|
|
|
}
|