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<?php |
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///////////////////////////////////////////////////////////////// |
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/// getID3() by James Heinrich <[email protected]> // |
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// available at http://getid3.sourceforge.net // |
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// or http://www.getid3.org // |
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// also https://github.com/JamesHeinrich/getID3 // |
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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'] - $PossiblyLongerLAMEversion_FrameLength; |
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$this->fseek($PossibleLAMEversionStringOffset); |
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$PossiblyLongerLAMEversion_Data = $this->fread($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'], $NamedPresetBitrates))) { |
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183
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$encoder_options = $thisfile_mpeg_audio_lame['preset_used']; |
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} elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) { |
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187
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static $KnownEncoderValues = array(); |
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if (empty($KnownEncoderValues)) { |
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190
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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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192
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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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196
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$KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3 |
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197
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$KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92 |
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198
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$KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91 |
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199
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$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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200
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$KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3 |
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201
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$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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202
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$KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3 |
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203
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$KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92 |
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204
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$KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91 |
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205
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$KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95 |
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206
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$KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3 |
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207
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$KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3 |
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208
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209
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$KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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210
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$KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1 |
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211
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$KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93 |
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212
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$KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95 |
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213
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$KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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214
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$KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1 |
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215
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$KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93 |
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216
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$KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95 |
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217
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$KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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218
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$KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1 |
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219
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$KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95 |
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220
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$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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221
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$KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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222
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$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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223
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$KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1 |
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224
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$KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95 |
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225
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$KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1 |
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226
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$KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95 |
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227
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$KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14 |
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228
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$KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92 |
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229
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$KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91 |
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230
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$KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1 |
|
231
|
|
|
$KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95 |
|
232
|
|
|
$KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14 |
|
233
|
|
|
$KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15 |
|
234
|
|
|
$KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1 |
|
235
|
|
|
$KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93 |
|
236
|
|
|
$KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95 |
|
237
|
|
|
$KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14 |
|
238
|
|
|
$KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15 |
|
239
|
|
|
$KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1 |
|
240
|
|
|
$KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93 |
|
241
|
|
|
$KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95 |
|
242
|
|
|
} |
|
243
|
|
|
|
|
244
|
|
|
if (isset($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']])) { |
|
245
|
|
|
|
|
246
|
|
|
$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']]; |
|
247
|
|
|
|
|
248
|
|
|
} 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']])) { |
|
249
|
|
|
|
|
250
|
|
|
$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']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; |
|
251
|
|
|
|
|
252
|
|
|
} elseif ($info['audio']['bitrate_mode'] == 'vbr') { |
|
253
|
|
|
|
|
254
|
|
|
// http://gabriel.mp3-tech.org/mp3infotag.html |
|
255
|
|
|
// int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h |
|
256
|
|
|
|
|
257
|
|
|
|
|
258
|
|
|
$LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10); |
|
259
|
|
|
$LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10); |
|
260
|
|
|
$encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value; |
|
261
|
|
|
|
|
262
|
|
|
} elseif ($info['audio']['bitrate_mode'] == 'cbr') { |
|
263
|
|
|
|
|
264
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); |
|
265
|
|
|
|
|
266
|
|
|
} else { |
|
267
|
|
|
|
|
268
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']); |
|
269
|
|
|
|
|
270
|
|
|
} |
|
271
|
|
|
|
|
272
|
|
|
} elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { |
|
273
|
|
|
|
|
274
|
|
|
$encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr']; |
|
275
|
|
|
|
|
276
|
|
|
} elseif (!empty($info['audio']['bitrate'])) { |
|
277
|
|
|
|
|
278
|
|
|
if ($info['audio']['bitrate_mode'] == 'cbr') { |
|
279
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); |
|
280
|
|
|
} else { |
|
281
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']); |
|
282
|
|
|
} |
|
283
|
|
|
|
|
284
|
|
|
} |
|
285
|
|
|
if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { |
|
286
|
|
|
$encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min']; |
|
287
|
|
|
} |
|
288
|
|
|
|
|
289
|
|
|
if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) { |
|
290
|
|
|
$encoder_options .= ' --nogap'; |
|
291
|
|
|
} |
|
292
|
|
|
|
|
293
|
|
|
if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) { |
|
294
|
|
|
$ExplodedOptions = explode(' ', $encoder_options, 4); |
|
295
|
|
|
if ($ExplodedOptions[0] == '--r3mix') { |
|
296
|
|
|
$ExplodedOptions[1] = 'r3mix'; |
|
297
|
|
|
} |
|
298
|
|
|
switch ($ExplodedOptions[0]) { |
|
299
|
|
|
case '--preset': |
|
300
|
|
|
case '--alt-preset': |
|
301
|
|
|
case '--r3mix': |
|
302
|
|
|
if ($ExplodedOptions[1] == 'fast') { |
|
303
|
|
|
$ExplodedOptions[1] .= ' '.$ExplodedOptions[2]; |
|
304
|
|
|
} |
|
305
|
|
|
switch ($ExplodedOptions[1]) { |
|
306
|
|
|
case 'portable': |
|
307
|
|
|
case 'medium': |
|
308
|
|
|
case 'standard': |
|
309
|
|
|
case 'extreme': |
|
310
|
|
|
case 'insane': |
|
311
|
|
|
case 'fast portable': |
|
312
|
|
|
case 'fast medium': |
|
313
|
|
|
case 'fast standard': |
|
314
|
|
|
case 'fast extreme': |
|
315
|
|
|
case 'fast insane': |
|
316
|
|
|
case 'r3mix': |
|
317
|
|
|
static $ExpectedLowpass = array( |
|
318
|
|
|
'insane|20500' => 20500, |
|
319
|
|
|
'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91 |
|
320
|
|
|
'medium|18000' => 18000, |
|
321
|
|
|
'fast medium|18000' => 18000, |
|
322
|
|
|
'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 |
|
323
|
|
|
'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 |
|
324
|
|
|
'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 |
|
325
|
|
|
'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 |
|
326
|
|
|
'standard|19000' => 19000, |
|
327
|
|
|
'fast standard|19000' => 19000, |
|
328
|
|
|
'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92 |
|
329
|
|
|
'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91 |
|
330
|
|
|
'r3mix|18000' => 18000, // 3.94, 3.95 |
|
331
|
|
|
); |
|
332
|
|
|
if (!isset($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))) { |
|
333
|
|
|
$encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency']; |
|
334
|
|
|
} |
|
335
|
|
|
break; |
|
336
|
|
|
|
|
337
|
|
|
default: |
|
338
|
|
|
break; |
|
339
|
|
|
} |
|
340
|
|
|
break; |
|
341
|
|
|
} |
|
342
|
|
|
} |
|
343
|
|
|
|
|
344
|
|
|
if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { |
|
345
|
|
|
if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) { |
|
346
|
|
|
$encoder_options .= ' --resample 44100'; |
|
347
|
|
|
} elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) { |
|
348
|
|
|
$encoder_options .= ' --resample 48000'; |
|
349
|
|
|
} elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) { |
|
350
|
|
|
switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) { |
|
351
|
|
|
case 0: // <= 32000 |
|
352
|
|
|
// may or may not be same as source frequency - ignore |
|
353
|
|
|
break; |
|
354
|
|
|
case 1: // 44100 |
|
355
|
|
|
case 2: // 48000 |
|
356
|
|
|
case 3: // 48000+ |
|
357
|
|
|
$ExplodedOptions = explode(' ', $encoder_options, 4); |
|
358
|
|
|
switch ($ExplodedOptions[0]) { |
|
359
|
|
|
case '--preset': |
|
360
|
|
|
case '--alt-preset': |
|
361
|
|
|
switch ($ExplodedOptions[1]) { |
|
362
|
|
|
case 'fast': |
|
363
|
|
|
case 'portable': |
|
364
|
|
|
case 'medium': |
|
365
|
|
|
case 'standard': |
|
366
|
|
|
case 'extreme': |
|
367
|
|
|
case 'insane': |
|
368
|
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; |
|
369
|
|
|
break; |
|
370
|
|
|
|
|
371
|
|
|
default: |
|
372
|
|
|
static $ExpectedResampledRate = array( |
|
373
|
|
|
'phon+/lw/mw-eu/sw|16000' => 16000, |
|
374
|
|
|
'mw-us|24000' => 24000, // 3.95 |
|
375
|
|
|
'mw-us|32000' => 32000, // 3.93 |
|
376
|
|
|
'mw-us|16000' => 16000, // 3.92 |
|
377
|
|
|
'phone|16000' => 16000, |
|
378
|
|
|
'phone|11025' => 11025, // 3.94a15 |
|
379
|
|
|
'radio|32000' => 32000, // 3.94a15 |
|
380
|
|
|
'fm/radio|32000' => 32000, // 3.92 |
|
381
|
|
|
'fm|32000' => 32000, // 3.90 |
|
382
|
|
|
'voice|32000' => 32000); |
|
383
|
|
|
if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) { |
|
384
|
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; |
|
385
|
|
|
} |
|
386
|
|
|
break; |
|
387
|
|
|
} |
|
388
|
|
|
break; |
|
389
|
|
|
|
|
390
|
|
|
case '--r3mix': |
|
391
|
|
|
default: |
|
392
|
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; |
|
393
|
|
|
break; |
|
394
|
|
|
} |
|
395
|
|
|
break; |
|
396
|
|
|
} |
|
397
|
|
|
} |
|
398
|
|
|
} |
|
399
|
|
|
if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) { |
|
400
|
|
|
//$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); |
|
401
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']); |
|
402
|
|
|
} |
|
403
|
|
|
|
|
404
|
|
|
return $encoder_options; |
|
405
|
|
|
} |
|
406
|
|
|
|
|
407
|
|
|
|
|
408
|
|
|
public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) { |
|
409
|
|
|
static $MPEGaudioVersionLookup; |
|
410
|
|
|
static $MPEGaudioLayerLookup; |
|
411
|
|
|
static $MPEGaudioBitrateLookup; |
|
412
|
|
|
static $MPEGaudioFrequencyLookup; |
|
413
|
|
|
static $MPEGaudioChannelModeLookup; |
|
414
|
|
|
static $MPEGaudioModeExtensionLookup; |
|
415
|
|
|
static $MPEGaudioEmphasisLookup; |
|
416
|
|
|
if (empty($MPEGaudioVersionLookup)) { |
|
417
|
|
|
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); |
|
418
|
|
|
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); |
|
419
|
|
|
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); |
|
420
|
|
|
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); |
|
421
|
|
|
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); |
|
422
|
|
|
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); |
|
423
|
|
|
$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); |
|
424
|
|
|
} |
|
425
|
|
|
|
|
426
|
|
|
if ($this->fseek($offset) != 0) { |
|
427
|
|
|
$info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at '.$offset; |
|
428
|
|
|
return false; |
|
429
|
|
|
} |
|
430
|
|
|
//$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame |
|
431
|
|
|
$headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data |
|
432
|
|
|
|
|
433
|
|
|
// MP3 audio frame structure: |
|
434
|
|
|
// $aa $aa $aa $aa [$bb $bb] $cc... |
|
435
|
|
|
// where $aa..$aa is the four-byte mpeg-audio header (below) |
|
436
|
|
|
// $bb $bb is the optional 2-byte CRC |
|
437
|
|
|
// and $cc... is the audio data |
|
438
|
|
|
|
|
439
|
|
|
$head4 = substr($headerstring, 0, 4); |
|
440
|
|
|
|
|
441
|
|
|
static $MPEGaudioHeaderDecodeCache = array(); |
|
442
|
|
|
if (isset($MPEGaudioHeaderDecodeCache[$head4])) { |
|
443
|
|
|
$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4]; |
|
444
|
|
|
} else { |
|
445
|
|
|
$MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4); |
|
446
|
|
|
$MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray; |
|
447
|
|
|
} |
|
448
|
|
|
|
|
449
|
|
|
static $MPEGaudioHeaderValidCache = array(); |
|
450
|
|
|
if (!isset($MPEGaudioHeaderValidCache[$head4])) { // Not in cache |
|
451
|
|
|
//$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1) |
|
452
|
|
|
$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false); |
|
453
|
|
|
} |
|
454
|
|
|
|
|
455
|
|
|
// shortcut |
|
456
|
|
|
if (!isset($info['mpeg']['audio'])) { |
|
457
|
|
|
$info['mpeg']['audio'] = array(); |
|
458
|
|
|
} |
|
459
|
|
|
$thisfile_mpeg_audio = &$info['mpeg']['audio']; |
|
460
|
|
|
|
|
461
|
|
|
|
|
462
|
|
|
if ($MPEGaudioHeaderValidCache[$head4]) { |
|
463
|
|
|
$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray; |
|
464
|
|
|
} else { |
|
465
|
|
|
$info['error'][] = 'Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset; |
|
466
|
|
|
return false; |
|
467
|
|
|
} |
|
468
|
|
|
|
|
469
|
|
|
if (!$FastMPEGheaderScan) { |
|
470
|
|
|
$thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']]; |
|
471
|
|
|
$thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']]; |
|
472
|
|
|
|
|
473
|
|
|
$thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']]; |
|
474
|
|
|
$thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2); |
|
475
|
|
|
$thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']]; |
|
476
|
|
|
$thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection']; |
|
477
|
|
|
$thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private']; |
|
478
|
|
|
$thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']]; |
|
479
|
|
|
$thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright']; |
|
480
|
|
|
$thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original']; |
|
481
|
|
|
$thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']]; |
|
482
|
|
|
|
|
483
|
|
|
$info['audio']['channels'] = $thisfile_mpeg_audio['channels']; |
|
484
|
|
|
$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; |
|
485
|
|
|
|
|
486
|
|
|
if ($thisfile_mpeg_audio['protection']) { |
|
487
|
|
|
$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2)); |
|
488
|
|
|
} |
|
489
|
|
|
} |
|
490
|
|
|
|
|
491
|
|
|
if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) { |
|
492
|
|
|
// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 |
|
493
|
|
|
$info['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1'; |
|
494
|
|
|
$thisfile_mpeg_audio['raw']['bitrate'] = 0; |
|
495
|
|
|
} |
|
496
|
|
|
$thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding']; |
|
497
|
|
|
$thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; |
|
498
|
|
|
|
|
499
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) { |
|
500
|
|
|
// only skip multiple frame check if free-format bitstream found at beginning of file |
|
501
|
|
|
// otherwise is quite possibly simply corrupted data |
|
502
|
|
|
$recursivesearch = false; |
|
503
|
|
|
} |
|
504
|
|
|
|
|
505
|
|
|
// For Layer 2 there are some combinations of bitrate and mode which are not allowed. |
|
506
|
|
|
if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) { |
|
507
|
|
|
|
|
508
|
|
|
$info['audio']['dataformat'] = 'mp2'; |
|
509
|
|
|
switch ($thisfile_mpeg_audio['channelmode']) { |
|
510
|
|
|
|
|
511
|
|
|
case 'mono': |
|
512
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { |
|
513
|
|
|
// these are ok |
|
514
|
|
|
} else { |
|
515
|
|
|
$info['error'][] = $thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'; |
|
516
|
|
|
return false; |
|
517
|
|
|
} |
|
518
|
|
|
break; |
|
519
|
|
|
|
|
520
|
|
|
case 'stereo': |
|
521
|
|
|
case 'joint stereo': |
|
522
|
|
|
case 'dual channel': |
|
523
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { |
|
524
|
|
|
// these are ok |
|
525
|
|
|
} else { |
|
526
|
|
|
$info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'; |
|
527
|
|
|
return false; |
|
528
|
|
|
} |
|
529
|
|
|
break; |
|
530
|
|
|
|
|
531
|
|
|
} |
|
532
|
|
|
|
|
533
|
|
|
} |
|
534
|
|
|
|
|
535
|
|
|
|
|
536
|
|
|
if ($info['audio']['sample_rate'] > 0) { |
|
537
|
|
|
$thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']); |
|
538
|
|
|
} |
|
539
|
|
|
|
|
540
|
|
|
$nextframetestoffset = $offset + 1; |
|
541
|
|
|
if ($thisfile_mpeg_audio['bitrate'] != 'free') { |
|
542
|
|
|
|
|
543
|
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; |
|
544
|
|
|
|
|
545
|
|
|
if (isset($thisfile_mpeg_audio['framelength'])) { |
|
546
|
|
|
$nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength']; |
|
547
|
|
|
} else { |
|
548
|
|
|
$info['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.'; |
|
549
|
|
|
return false; |
|
550
|
|
|
} |
|
551
|
|
|
|
|
552
|
|
|
} |
|
553
|
|
|
|
|
554
|
|
|
$ExpectedNumberOfAudioBytes = 0; |
|
555
|
|
|
|
|
556
|
|
|
//////////////////////////////////////////////////////////////////////////////////// |
|
557
|
|
|
// Variable-bitrate headers |
|
558
|
|
|
|
|
559
|
|
|
if (substr($headerstring, 4 + 32, 4) == 'VBRI') { |
|
560
|
|
|
// Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) |
|
561
|
|
|
// specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html |
|
562
|
|
|
|
|
563
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
|
564
|
|
|
$thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; |
|
565
|
|
|
$info['audio']['codec'] = 'Fraunhofer'; |
|
566
|
|
|
|
|
567
|
|
|
$SideInfoData = substr($headerstring, 4 + 2, 32); |
|
568
|
|
|
|
|
569
|
|
|
$FraunhoferVBROffset = 36; |
|
570
|
|
|
|
|
571
|
|
|
$thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion |
|
572
|
|
|
$thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay |
|
573
|
|
|
$thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality |
|
574
|
|
|
$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes |
|
575
|
|
|
$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames |
|
576
|
|
|
$thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize |
|
577
|
|
|
$thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale |
|
578
|
|
|
$thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes |
|
579
|
|
|
$thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames |
|
580
|
|
|
|
|
581
|
|
|
$ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes']; |
|
582
|
|
|
|
|
583
|
|
|
$previousbyteoffset = $offset; |
|
584
|
|
|
for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { |
|
585
|
|
|
$Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes'])); |
|
586
|
|
|
$FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes']; |
|
587
|
|
|
$thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']); |
|
588
|
|
|
$thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset; |
|
589
|
|
|
$previousbyteoffset += $Fraunhofer_OffsetN; |
|
590
|
|
|
} |
|
591
|
|
|
|
|
592
|
|
|
|
|
593
|
|
|
} else { |
|
594
|
|
|
|
|
595
|
|
|
// Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36) |
|
596
|
|
|
// depending on MPEG layer and number of channels |
|
597
|
|
|
|
|
598
|
|
|
$VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); |
|
599
|
|
|
$SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4); |
|
600
|
|
|
|
|
601
|
|
|
if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) { |
|
602
|
|
|
// 'Xing' is traditional Xing VBR frame |
|
603
|
|
|
// 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) |
|
604
|
|
|
// 'Info' *can* legally be used to specify a VBR file as well, however. |
|
605
|
|
|
|
|
606
|
|
|
// http://www.multiweb.cz/twoinches/MP3inside.htm |
|
607
|
|
|
//00..03 = "Xing" or "Info" |
|
608
|
|
|
//04..07 = Flags: |
|
609
|
|
|
// 0x01 Frames Flag set if value for number of frames in file is stored |
|
610
|
|
|
// 0x02 Bytes Flag set if value for filesize in bytes is stored |
|
611
|
|
|
// 0x04 TOC Flag set if values for TOC are stored |
|
612
|
|
|
// 0x08 VBR Scale Flag set if values for VBR scale is stored |
|
613
|
|
|
//08..11 Frames: Number of frames in file (including the first Xing/Info one) |
|
614
|
|
|
//12..15 Bytes: File length in Bytes |
|
615
|
|
|
//16..115 TOC (Table of Contents): |
|
616
|
|
|
// Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. |
|
617
|
|
|
// Each Byte has a value according this formula: |
|
618
|
|
|
// (TOC[i] / 256) * fileLenInBytes |
|
619
|
|
|
// So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use: |
|
620
|
|
|
// TOC[(60/240)*100] = TOC[25] |
|
621
|
|
|
// and corresponding Byte in file is then approximately at: |
|
622
|
|
|
// (TOC[25]/256) * 5000000 |
|
623
|
|
|
//116..119 VBR Scale |
|
624
|
|
|
|
|
625
|
|
|
|
|
626
|
|
|
// should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME |
|
627
|
|
|
// if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') { |
|
628
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
|
629
|
|
|
$thisfile_mpeg_audio['VBR_method'] = 'Xing'; |
|
630
|
|
|
// } else { |
|
631
|
|
|
// $ScanAsCBR = true; |
|
632
|
|
|
// $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
|
633
|
|
|
// } |
|
634
|
|
|
|
|
635
|
|
|
$thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4)); |
|
636
|
|
|
|
|
637
|
|
|
$thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); |
|
638
|
|
|
$thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); |
|
639
|
|
|
$thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); |
|
640
|
|
|
$thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); |
|
641
|
|
|
|
|
642
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['frames']) { |
|
643
|
|
|
$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4)); |
|
644
|
|
|
//$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame |
|
645
|
|
|
} |
|
646
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['bytes']) { |
|
647
|
|
|
$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4)); |
|
648
|
|
|
} |
|
649
|
|
|
|
|
650
|
|
|
//if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { |
|
651
|
|
|
if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { |
|
652
|
|
|
|
|
653
|
|
|
$framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']; |
|
654
|
|
|
|
|
655
|
|
|
if ($thisfile_mpeg_audio['layer'] == '1') { |
|
656
|
|
|
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 |
|
657
|
|
|
//$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; |
|
658
|
|
|
$info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12; |
|
659
|
|
|
} else { |
|
660
|
|
|
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 |
|
661
|
|
|
//$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; |
|
662
|
|
|
$info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144; |
|
663
|
|
|
} |
|
664
|
|
|
$thisfile_mpeg_audio['framelength'] = floor($framelengthfloat); |
|
665
|
|
|
} |
|
666
|
|
|
|
|
667
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['toc']) { |
|
668
|
|
|
$LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100); |
|
669
|
|
|
for ($i = 0; $i < 100; $i++) { |
|
670
|
|
|
$thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i}); |
|
671
|
|
|
} |
|
672
|
|
|
} |
|
673
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { |
|
674
|
|
|
$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4)); |
|
675
|
|
|
} |
|
676
|
|
|
|
|
677
|
|
|
|
|
678
|
|
|
// http://gabriel.mp3-tech.org/mp3infotag.html |
|
679
|
|
|
if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') { |
|
680
|
|
|
|
|
681
|
|
|
// shortcut |
|
682
|
|
|
$thisfile_mpeg_audio['LAME'] = array(); |
|
683
|
|
|
$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; |
|
684
|
|
|
|
|
685
|
|
|
|
|
686
|
|
|
$thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20); |
|
687
|
|
|
$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9); |
|
688
|
|
|
|
|
689
|
|
|
if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') { |
|
690
|
|
|
|
|
691
|
|
|
// extra 11 chars are not part of version string when LAMEtag present |
|
692
|
|
|
unset($thisfile_mpeg_audio_lame['long_version']); |
|
693
|
|
|
|
|
694
|
|
|
// It the LAME tag was only introduced in LAME v3.90 |
|
695
|
|
|
// http://www.hydrogenaudio.org/?act=ST&f=15&t=9933 |
|
696
|
|
|
|
|
697
|
|
|
// Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html |
|
698
|
|
|
// are assuming a 'Xing' identifier offset of 0x24, which is the case for |
|
699
|
|
|
// MPEG-1 non-mono, but not for other combinations |
|
700
|
|
|
$LAMEtagOffsetContant = $VBRidOffset - 0x24; |
|
701
|
|
|
|
|
702
|
|
|
// shortcuts |
|
703
|
|
|
$thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array()); |
|
704
|
|
|
$thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD']; |
|
705
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track']; |
|
706
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album']; |
|
707
|
|
|
$thisfile_mpeg_audio_lame['raw'] = array(); |
|
708
|
|
|
$thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw']; |
|
709
|
|
|
|
|
710
|
|
|
// byte $9B VBR Quality |
|
711
|
|
|
// This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications. |
|
712
|
|
|
// Actually overwrites original Xing bytes |
|
713
|
|
|
unset($thisfile_mpeg_audio['VBR_scale']); |
|
714
|
|
|
$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1)); |
|
715
|
|
|
|
|
716
|
|
|
// bytes $9C-$A4 Encoder short VersionString |
|
717
|
|
|
$thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9); |
|
718
|
|
|
|
|
719
|
|
|
// byte $A5 Info Tag revision + VBR method |
|
720
|
|
|
$LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1)); |
|
721
|
|
|
|
|
722
|
|
|
$thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4; |
|
723
|
|
|
$thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F; |
|
724
|
|
|
$thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']); |
|
725
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr' |
|
726
|
|
|
|
|
727
|
|
|
// byte $A6 Lowpass filter value |
|
728
|
|
|
$thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100; |
|
729
|
|
|
|
|
730
|
|
|
// bytes $A7-$AE Replay Gain |
|
731
|
|
|
// http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html |
|
732
|
|
|
// bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" |
|
733
|
|
|
if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') { |
|
734
|
|
|
// LAME 3.94a16 and later - 9.23 fixed point |
|
735
|
|
|
// ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375 |
|
736
|
|
|
$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608); |
|
737
|
|
|
} else { |
|
738
|
|
|
// LAME 3.94a15 and earlier - 32-bit floating point |
|
739
|
|
|
// Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15 |
|
740
|
|
|
$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4)); |
|
741
|
|
|
} |
|
742
|
|
|
if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) { |
|
743
|
|
|
unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); |
|
744
|
|
|
} else { |
|
745
|
|
|
$thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); |
|
746
|
|
|
} |
|
747
|
|
|
|
|
748
|
|
|
$thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2)); |
|
749
|
|
|
$thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2)); |
|
750
|
|
|
|
|
751
|
|
|
|
|
752
|
|
|
if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) { |
|
753
|
|
|
|
|
754
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13; |
|
755
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10; |
|
756
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9; |
|
757
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF; |
|
758
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']); |
|
759
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']); |
|
760
|
|
|
$thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']); |
|
761
|
|
|
|
|
762
|
|
|
if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { |
|
763
|
|
|
$info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; |
|
764
|
|
|
} |
|
765
|
|
|
$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator']; |
|
766
|
|
|
$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db']; |
|
767
|
|
|
} else { |
|
768
|
|
|
unset($thisfile_mpeg_audio_lame_RGAD['track']); |
|
769
|
|
|
} |
|
770
|
|
|
if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) { |
|
771
|
|
|
|
|
772
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; |
|
773
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; |
|
774
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; |
|
775
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; |
|
776
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']); |
|
777
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']); |
|
778
|
|
|
$thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']); |
|
779
|
|
|
|
|
780
|
|
|
if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { |
|
781
|
|
|
$info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; |
|
782
|
|
|
} |
|
783
|
|
|
$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator']; |
|
784
|
|
|
$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db']; |
|
785
|
|
|
} else { |
|
786
|
|
|
unset($thisfile_mpeg_audio_lame_RGAD['album']); |
|
787
|
|
|
} |
|
788
|
|
|
if (empty($thisfile_mpeg_audio_lame_RGAD)) { |
|
789
|
|
|
unset($thisfile_mpeg_audio_lame['RGAD']); |
|
790
|
|
|
} |
|
791
|
|
|
|
|
792
|
|
|
|
|
793
|
|
|
// byte $AF Encoding flags + ATH Type |
|
794
|
|
|
$EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1)); |
|
795
|
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10); |
|
796
|
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20); |
|
797
|
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40); |
|
798
|
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80); |
|
799
|
|
|
$thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F; |
|
800
|
|
|
|
|
801
|
|
|
// byte $B0 if ABR {specified bitrate} else {minimal bitrate} |
|
802
|
|
|
$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1)); |
|
803
|
|
|
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR) |
|
804
|
|
|
$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; |
|
805
|
|
|
} elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR) |
|
806
|
|
|
// ignore |
|
807
|
|
|
} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate |
|
808
|
|
|
$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; |
|
809
|
|
|
} |
|
810
|
|
|
|
|
811
|
|
|
// bytes $B1-$B3 Encoder delays |
|
812
|
|
|
$EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3)); |
|
813
|
|
|
$thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12; |
|
814
|
|
|
$thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF; |
|
815
|
|
|
|
|
816
|
|
|
// byte $B4 Misc |
|
817
|
|
|
$MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1)); |
|
818
|
|
|
$thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03); |
|
819
|
|
|
$thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2; |
|
820
|
|
|
$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5; |
|
821
|
|
|
$thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6; |
|
822
|
|
|
$thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping']; |
|
823
|
|
|
$thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); |
|
824
|
|
|
$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality']; |
|
825
|
|
|
$thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']); |
|
826
|
|
|
|
|
827
|
|
|
// byte $B5 MP3 Gain |
|
828
|
|
|
$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true); |
|
829
|
|
|
$thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain']; |
|
830
|
|
|
$thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6)); |
|
831
|
|
|
|
|
832
|
|
|
// bytes $B6-$B7 Preset and surround info |
|
833
|
|
|
$PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2)); |
|
834
|
|
|
// Reserved = ($PresetSurroundBytes & 0xC000); |
|
835
|
|
|
$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800); |
|
836
|
|
|
$thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); |
|
837
|
|
|
$thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); |
|
838
|
|
|
$thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); |
|
839
|
|
|
if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { |
|
840
|
|
|
$info['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to [email protected]'; |
|
841
|
|
|
} |
|
842
|
|
|
if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) { |
|
843
|
|
|
// this may change if 3.90.4 ever comes out |
|
844
|
|
|
$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3'; |
|
845
|
|
|
} |
|
846
|
|
|
|
|
847
|
|
|
// bytes $B8-$BB MusicLength |
|
848
|
|
|
$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4)); |
|
849
|
|
|
$ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); |
|
850
|
|
|
|
|
851
|
|
|
// bytes $BC-$BD MusicCRC |
|
852
|
|
|
$thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2)); |
|
853
|
|
|
|
|
854
|
|
|
// bytes $BE-$BF CRC-16 of Info Tag |
|
855
|
|
|
$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2)); |
|
856
|
|
|
|
|
857
|
|
|
|
|
858
|
|
|
// LAME CBR |
|
859
|
|
|
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { |
|
860
|
|
|
|
|
861
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
|
862
|
|
|
$thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); |
|
863
|
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; |
|
864
|
|
|
//if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) { |
|
865
|
|
|
// $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min']; |
|
866
|
|
|
//} |
|
867
|
|
|
|
|
868
|
|
|
} |
|
869
|
|
|
|
|
870
|
|
|
} |
|
871
|
|
|
} |
|
872
|
|
|
|
|
873
|
|
|
} else { |
|
874
|
|
|
|
|
875
|
|
|
// not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) |
|
876
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
|
877
|
|
|
if ($recursivesearch) { |
|
878
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
|
879
|
|
|
if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) { |
|
880
|
|
|
$recursivesearch = false; |
|
881
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
|
882
|
|
|
} |
|
883
|
|
|
if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { |
|
884
|
|
|
$info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'; |
|
885
|
|
|
} |
|
886
|
|
|
} |
|
887
|
|
|
|
|
888
|
|
|
} |
|
889
|
|
|
|
|
890
|
|
|
} |
|
891
|
|
|
|
|
892
|
|
|
if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) { |
|
893
|
|
|
if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) { |
|
894
|
|
|
if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) { |
|
895
|
|
|
// ignore, audio data is broken into chunks so will always be data "missing" |
|
896
|
|
|
} |
|
897
|
|
|
elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) { |
|
898
|
|
|
$this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'); |
|
899
|
|
|
} |
|
900
|
|
|
else { |
|
901
|
|
|
$this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)'); |
|
902
|
|
|
} |
|
903
|
|
|
} else { |
|
904
|
|
|
if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) { |
|
905
|
|
|
// $prenullbytefileoffset = $this->ftell(); |
|
906
|
|
|
// $this->fseek($info['avdataend']); |
|
907
|
|
|
// $PossibleNullByte = $this->fread(1); |
|
908
|
|
|
// $this->fseek($prenullbytefileoffset); |
|
909
|
|
|
// if ($PossibleNullByte === "\x00") { |
|
910
|
|
|
$info['avdataend']--; |
|
911
|
|
|
// $info['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored'; |
|
912
|
|
|
// } else { |
|
913
|
|
|
// $info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'; |
|
914
|
|
|
// } |
|
915
|
|
|
} else { |
|
916
|
|
|
$info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'; |
|
917
|
|
|
} |
|
918
|
|
|
} |
|
919
|
|
|
} |
|
920
|
|
|
|
|
921
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) { |
|
922
|
|
|
if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { |
|
923
|
|
|
$framebytelength = $this->FreeFormatFrameLength($offset, true); |
|
924
|
|
|
if ($framebytelength > 0) { |
|
925
|
|
|
$thisfile_mpeg_audio['framelength'] = $framebytelength; |
|
926
|
|
|
if ($thisfile_mpeg_audio['layer'] == '1') { |
|
927
|
|
|
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 |
|
928
|
|
|
$info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; |
|
929
|
|
|
} else { |
|
930
|
|
|
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 |
|
931
|
|
|
$info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; |
|
932
|
|
|
} |
|
933
|
|
|
} else { |
|
934
|
|
|
$info['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header'; |
|
935
|
|
|
} |
|
936
|
|
|
} |
|
937
|
|
|
} |
|
938
|
|
|
|
|
939
|
|
|
if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') { |
|
940
|
|
|
switch ($thisfile_mpeg_audio['bitrate_mode']) { |
|
941
|
|
|
case 'vbr': |
|
942
|
|
|
case 'abr': |
|
943
|
|
|
$bytes_per_frame = 1152; |
|
944
|
|
|
if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) { |
|
945
|
|
|
$bytes_per_frame = 384; |
|
946
|
|
|
} elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) { |
|
947
|
|
|
$bytes_per_frame = 576; |
|
948
|
|
|
} |
|
949
|
|
|
$thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0); |
|
950
|
|
|
if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { |
|
951
|
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; |
|
952
|
|
|
$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion |
|
953
|
|
|
} |
|
954
|
|
|
break; |
|
955
|
|
|
} |
|
956
|
|
|
} |
|
957
|
|
|
|
|
958
|
|
|
// End variable-bitrate headers |
|
959
|
|
|
//////////////////////////////////////////////////////////////////////////////////// |
|
960
|
|
|
|
|
961
|
|
|
if ($recursivesearch) { |
|
962
|
|
|
|
|
963
|
|
|
if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) { |
|
964
|
|
|
return false; |
|
965
|
|
|
} |
|
966
|
|
|
|
|
967
|
|
|
} |
|
968
|
|
|
|
|
969
|
|
|
|
|
970
|
|
|
//if (false) { |
|
971
|
|
|
// // experimental side info parsing section - not returning anything useful yet |
|
972
|
|
|
// |
|
973
|
|
|
// $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData); |
|
974
|
|
|
// $SideInfoOffset = 0; |
|
975
|
|
|
// |
|
976
|
|
|
// if ($thisfile_mpeg_audio['version'] == '1') { |
|
977
|
|
|
// if ($thisfile_mpeg_audio['channelmode'] == 'mono') { |
|
978
|
|
|
// // MPEG-1 (mono) |
|
979
|
|
|
// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); |
|
980
|
|
|
// $SideInfoOffset += 9; |
|
981
|
|
|
// $SideInfoOffset += 5; |
|
982
|
|
|
// } else { |
|
983
|
|
|
// // MPEG-1 (stereo, joint-stereo, dual-channel) |
|
984
|
|
|
// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); |
|
985
|
|
|
// $SideInfoOffset += 9; |
|
986
|
|
|
// $SideInfoOffset += 3; |
|
987
|
|
|
// } |
|
988
|
|
|
// } else { // 2 or 2.5 |
|
989
|
|
|
// if ($thisfile_mpeg_audio['channelmode'] == 'mono') { |
|
990
|
|
|
// // MPEG-2, MPEG-2.5 (mono) |
|
991
|
|
|
// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); |
|
992
|
|
|
// $SideInfoOffset += 8; |
|
993
|
|
|
// $SideInfoOffset += 1; |
|
994
|
|
|
// } else { |
|
995
|
|
|
// // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel) |
|
996
|
|
|
// $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); |
|
997
|
|
|
// $SideInfoOffset += 8; |
|
998
|
|
|
// $SideInfoOffset += 2; |
|
999
|
|
|
// } |
|
1000
|
|
|
// } |
|
1001
|
|
|
// |
|
1002
|
|
|
// if ($thisfile_mpeg_audio['version'] == '1') { |
|
1003
|
|
|
// for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { |
|
1004
|
|
|
// for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) { |
|
1005
|
|
|
// $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1); |
|
1006
|
|
|
// $SideInfoOffset += 2; |
|
1007
|
|
|
// } |
|
1008
|
|
|
// } |
|
1009
|
|
|
// } |
|
1010
|
|
|
// for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) { |
|
1011
|
|
|
// for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { |
|
1012
|
|
|
// $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12); |
|
1013
|
|
|
// $SideInfoOffset += 12; |
|
1014
|
|
|
// $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); |
|
1015
|
|
|
// $SideInfoOffset += 9; |
|
1016
|
|
|
// $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8); |
|
1017
|
|
|
// $SideInfoOffset += 8; |
|
1018
|
|
|
// if ($thisfile_mpeg_audio['version'] == '1') { |
|
1019
|
|
|
// $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); |
|
1020
|
|
|
// $SideInfoOffset += 4; |
|
1021
|
|
|
// } else { |
|
1022
|
|
|
// $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); |
|
1023
|
|
|
// $SideInfoOffset += 9; |
|
1024
|
|
|
// } |
|
1025
|
|
|
// $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); |
|
1026
|
|
|
// $SideInfoOffset += 1; |
|
1027
|
|
|
// |
|
1028
|
|
|
// if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') { |
|
1029
|
|
|
// |
|
1030
|
|
|
// $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2); |
|
1031
|
|
|
// $SideInfoOffset += 2; |
|
1032
|
|
|
// $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); |
|
1033
|
|
|
// $SideInfoOffset += 1; |
|
1034
|
|
|
// |
|
1035
|
|
|
// for ($region = 0; $region < 2; $region++) { |
|
1036
|
|
|
// $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); |
|
1037
|
|
|
// $SideInfoOffset += 5; |
|
1038
|
|
|
// } |
|
1039
|
|
|
// $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0; |
|
1040
|
|
|
// |
|
1041
|
|
|
// for ($window = 0; $window < 3; $window++) { |
|
1042
|
|
|
// $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3); |
|
1043
|
|
|
// $SideInfoOffset += 3; |
|
1044
|
|
|
// } |
|
1045
|
|
|
// |
|
1046
|
|
|
// } else { |
|
1047
|
|
|
// |
|
1048
|
|
|
// for ($region = 0; $region < 3; $region++) { |
|
1049
|
|
|
// $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); |
|
1050
|
|
|
// $SideInfoOffset += 5; |
|
1051
|
|
|
// } |
|
1052
|
|
|
// |
|
1053
|
|
|
// $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); |
|
1054
|
|
|
// $SideInfoOffset += 4; |
|
1055
|
|
|
// $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3); |
|
1056
|
|
|
// $SideInfoOffset += 3; |
|
1057
|
|
|
// $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0; |
|
1058
|
|
|
// } |
|
1059
|
|
|
// |
|
1060
|
|
|
// if ($thisfile_mpeg_audio['version'] == '1') { |
|
1061
|
|
|
// $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); |
|
1062
|
|
|
// $SideInfoOffset += 1; |
|
1063
|
|
|
// } |
|
1064
|
|
|
// $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); |
|
1065
|
|
|
// $SideInfoOffset += 1; |
|
1066
|
|
|
// $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); |
|
1067
|
|
|
// $SideInfoOffset += 1; |
|
1068
|
|
|
// } |
|
1069
|
|
|
// } |
|
1070
|
|
|
//} |
|
1071
|
|
|
|
|
1072
|
|
|
return true; |
|
1073
|
|
|
} |
|
1074
|
|
|
|
|
1075
|
|
|
public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) { |
|
1076
|
|
|
$info = &$this->getid3->info; |
|
1077
|
|
|
$firstframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); |
|
1078
|
|
|
$this->decodeMPEGaudioHeader($offset, $firstframetestarray, false); |
|
1079
|
|
|
|
|
1080
|
|
|
for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) { |
|
1081
|
|
|
// check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch |
|
1082
|
|
|
if (($nextframetestoffset + 4) >= $info['avdataend']) { |
|
1083
|
|
|
// end of file |
|
1084
|
|
|
return true; |
|
1085
|
|
|
} |
|
1086
|
|
|
|
|
1087
|
|
|
$nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); |
|
1088
|
|
|
if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) { |
|
1089
|
|
|
if ($ScanAsCBR) { |
|
1090
|
|
|
// force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header |
|
1091
|
|
|
if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) { |
|
1092
|
|
|
return false; |
|
1093
|
|
|
} |
|
1094
|
|
|
} |
|
1095
|
|
|
|
|
1096
|
|
|
|
|
1097
|
|
|
// next frame is OK, get ready to check the one after that |
|
1098
|
|
|
if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) { |
|
1099
|
|
|
$nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength']; |
|
1100
|
|
|
} else { |
|
1101
|
|
|
$info['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.'; |
|
1102
|
|
|
return false; |
|
1103
|
|
|
} |
|
1104
|
|
|
|
|
1105
|
|
|
} elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) { |
|
1106
|
|
|
|
|
1107
|
|
|
// 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 |
|
1108
|
|
|
return true; |
|
1109
|
|
|
|
|
1110
|
|
|
} else { |
|
1111
|
|
|
|
|
1112
|
|
|
// next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence |
|
1113
|
|
|
$info['warning'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.'; |
|
1114
|
|
|
|
|
1115
|
|
|
return false; |
|
1116
|
|
|
} |
|
1117
|
|
|
} |
|
1118
|
|
|
return true; |
|
1119
|
|
|
} |
|
1120
|
|
|
|
|
1121
|
|
|
public function FreeFormatFrameLength($offset, $deepscan=false) { |
|
1122
|
|
|
$info = &$this->getid3->info; |
|
1123
|
|
|
|
|
1124
|
|
|
$this->fseek($offset); |
|
1125
|
|
|
$MPEGaudioData = $this->fread(32768); |
|
1126
|
|
|
|
|
1127
|
|
|
$SyncPattern1 = substr($MPEGaudioData, 0, 4); |
|
1128
|
|
|
// may be different pattern due to padding |
|
1129
|
|
|
$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3}; |
|
1130
|
|
|
if ($SyncPattern2 === $SyncPattern1) { |
|
1131
|
|
|
$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3}; |
|
1132
|
|
|
} |
|
1133
|
|
|
|
|
1134
|
|
|
$framelength = false; |
|
1135
|
|
|
$framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4); |
|
1136
|
|
|
$framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4); |
|
1137
|
|
|
if ($framelength1 > 4) { |
|
1138
|
|
|
$framelength = $framelength1; |
|
1139
|
|
|
} |
|
1140
|
|
|
if (($framelength2 > 4) && ($framelength2 < $framelength1)) { |
|
1141
|
|
|
$framelength = $framelength2; |
|
1142
|
|
|
} |
|
1143
|
|
|
if (!$framelength) { |
|
1144
|
|
|
|
|
1145
|
|
|
// LAME 3.88 has a different value for modeextension on the first frame vs the rest |
|
1146
|
|
|
$framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4); |
|
1147
|
|
|
$framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4); |
|
1148
|
|
|
|
|
1149
|
|
|
if ($framelength1 > 4) { |
|
1150
|
|
|
$framelength = $framelength1; |
|
1151
|
|
|
} |
|
1152
|
|
|
if (($framelength2 > 4) && ($framelength2 < $framelength1)) { |
|
1153
|
|
|
$framelength = $framelength2; |
|
1154
|
|
|
} |
|
1155
|
|
|
if (!$framelength) { |
|
1156
|
|
|
$info['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset; |
|
1157
|
|
|
return false; |
|
1158
|
|
|
} else { |
|
1159
|
|
|
$info['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'; |
|
1160
|
|
|
$info['audio']['codec'] = 'LAME'; |
|
1161
|
|
|
$info['audio']['encoder'] = 'LAME3.88'; |
|
1162
|
|
|
$SyncPattern1 = substr($SyncPattern1, 0, 3); |
|
1163
|
|
|
$SyncPattern2 = substr($SyncPattern2, 0, 3); |
|
1164
|
|
|
} |
|
1165
|
|
|
} |
|
1166
|
|
|
|
|
1167
|
|
|
if ($deepscan) { |
|
1168
|
|
|
|
|
1169
|
|
|
$ActualFrameLengthValues = array(); |
|
1170
|
|
|
$nextoffset = $offset + $framelength; |
|
1171
|
|
|
while ($nextoffset < ($info['avdataend'] - 6)) { |
|
1172
|
|
|
$this->fseek($nextoffset - 1); |
|
1173
|
|
|
$NextSyncPattern = $this->fread(6); |
|
1174
|
|
|
if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) { |
|
1175
|
|
|
// good - found where expected |
|
1176
|
|
|
$ActualFrameLengthValues[] = $framelength; |
|
1177
|
|
|
} elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) { |
|
1178
|
|
|
// ok - found one byte earlier than expected (last frame wasn't padded, first frame was) |
|
1179
|
|
|
$ActualFrameLengthValues[] = ($framelength - 1); |
|
1180
|
|
|
$nextoffset--; |
|
1181
|
|
|
} elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) { |
|
1182
|
|
|
// ok - found one byte later than expected (last frame was padded, first frame wasn't) |
|
1183
|
|
|
$ActualFrameLengthValues[] = ($framelength + 1); |
|
1184
|
|
|
$nextoffset++; |
|
1185
|
|
|
} else { |
|
1186
|
|
|
$info['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset; |
|
1187
|
|
|
return false; |
|
1188
|
|
|
} |
|
1189
|
|
|
$nextoffset += $framelength; |
|
1190
|
|
|
} |
|
1191
|
|
|
if (count($ActualFrameLengthValues) > 0) { |
|
1192
|
|
|
$framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues))); |
|
1193
|
|
|
} |
|
1194
|
|
|
} |
|
1195
|
|
|
return $framelength; |
|
1196
|
|
|
} |
|
1197
|
|
|
|
|
1198
|
|
|
public function getOnlyMPEGaudioInfoBruteForce() { |
|
1199
|
|
|
$MPEGaudioHeaderDecodeCache = array(); |
|
1200
|
|
|
$MPEGaudioHeaderValidCache = array(); |
|
1201
|
|
|
$MPEGaudioHeaderLengthCache = array(); |
|
1202
|
|
|
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); |
|
1203
|
|
|
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); |
|
1204
|
|
|
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); |
|
1205
|
|
|
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); |
|
1206
|
|
|
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); |
|
1207
|
|
|
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); |
|
1208
|
|
|
$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); |
|
1209
|
|
|
$LongMPEGversionLookup = array(); |
|
1210
|
|
|
$LongMPEGlayerLookup = array(); |
|
1211
|
|
|
$LongMPEGbitrateLookup = array(); |
|
1212
|
|
|
$LongMPEGpaddingLookup = array(); |
|
1213
|
|
|
$LongMPEGfrequencyLookup = array(); |
|
1214
|
|
|
$Distribution['bitrate'] = array(); |
|
1215
|
|
|
$Distribution['frequency'] = array(); |
|
1216
|
|
|
$Distribution['layer'] = array(); |
|
1217
|
|
|
$Distribution['version'] = array(); |
|
1218
|
|
|
$Distribution['padding'] = array(); |
|
1219
|
|
|
|
|
1220
|
|
|
$info = &$this->getid3->info; |
|
1221
|
|
|
$this->fseek($info['avdataoffset']); |
|
1222
|
|
|
|
|
1223
|
|
|
$max_frames_scan = 5000; |
|
1224
|
|
|
$frames_scanned = 0; |
|
1225
|
|
|
|
|
1226
|
|
|
$previousvalidframe = $info['avdataoffset']; |
|
1227
|
|
|
while ($this->ftell() < $info['avdataend']) { |
|
1228
|
|
|
set_time_limit(30); |
|
1229
|
|
|
$head4 = $this->fread(4); |
|
1230
|
|
|
if (strlen($head4) < 4) { |
|
1231
|
|
|
break; |
|
1232
|
|
|
} |
|
1233
|
|
|
if ($head4{0} != "\xFF") { |
|
1234
|
|
|
for ($i = 1; $i < 4; $i++) { |
|
1235
|
|
|
if ($head4{$i} == "\xFF") { |
|
1236
|
|
|
$this->fseek($i - 4, SEEK_CUR); |
|
1237
|
|
|
continue 2; |
|
1238
|
|
|
} |
|
1239
|
|
|
} |
|
1240
|
|
|
continue; |
|
1241
|
|
|
} |
|
1242
|
|
|
if (!isset($MPEGaudioHeaderDecodeCache[$head4])) { |
|
1243
|
|
|
$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4); |
|
1244
|
|
|
} |
|
1245
|
|
|
if (!isset($MPEGaudioHeaderValidCache[$head4])) { |
|
1246
|
|
|
$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false); |
|
1247
|
|
|
} |
|
1248
|
|
|
if ($MPEGaudioHeaderValidCache[$head4]) { |
|
1249
|
|
|
|
|
1250
|
|
|
if (!isset($MPEGaudioHeaderLengthCache[$head4])) { |
|
1251
|
|
|
$LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']]; |
|
1252
|
|
|
$LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']]; |
|
1253
|
|
|
$LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']]; |
|
1254
|
|
|
$LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding']; |
|
1255
|
|
|
$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']]; |
|
1256
|
|
|
$MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength( |
|
1257
|
|
|
$LongMPEGbitrateLookup[$head4], |
|
1258
|
|
|
$LongMPEGversionLookup[$head4], |
|
1259
|
|
|
$LongMPEGlayerLookup[$head4], |
|
1260
|
|
|
$LongMPEGpaddingLookup[$head4], |
|
1261
|
|
|
$LongMPEGfrequencyLookup[$head4]); |
|
1262
|
|
|
} |
|
1263
|
|
|
if ($MPEGaudioHeaderLengthCache[$head4] > 4) { |
|
1264
|
|
|
$WhereWeWere = $this->ftell(); |
|
1265
|
|
|
$this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR); |
|
1266
|
|
|
$next4 = $this->fread(4); |
|
1267
|
|
|
if ($next4{0} == "\xFF") { |
|
1268
|
|
|
if (!isset($MPEGaudioHeaderDecodeCache[$next4])) { |
|
1269
|
|
|
$MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4); |
|
1270
|
|
|
} |
|
1271
|
|
|
if (!isset($MPEGaudioHeaderValidCache[$next4])) { |
|
1272
|
|
|
$MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false); |
|
1273
|
|
|
} |
|
1274
|
|
|
if ($MPEGaudioHeaderValidCache[$next4]) { |
|
1275
|
|
|
$this->fseek(-4, SEEK_CUR); |
|
1276
|
|
|
|
|
1277
|
|
|
getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]); |
|
1278
|
|
|
getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]); |
|
1279
|
|
|
getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]); |
|
1280
|
|
|
getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]); |
|
1281
|
|
|
getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]); |
|
1282
|
|
|
if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) { |
|
1283
|
|
|
$pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']); |
|
1284
|
|
|
$info['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.'; |
|
1285
|
|
|
foreach ($Distribution as $key1 => $value1) { |
|
1286
|
|
|
foreach ($value1 as $key2 => $value2) { |
|
1287
|
|
|
$Distribution[$key1][$key2] = round($value2 / $pct_data_scanned); |
|
1288
|
|
|
} |
|
1289
|
|
|
} |
|
1290
|
|
|
break; |
|
1291
|
|
|
} |
|
1292
|
|
|
continue; |
|
1293
|
|
|
} |
|
1294
|
|
|
} |
|
1295
|
|
|
unset($next4); |
|
1296
|
|
|
$this->fseek($WhereWeWere - 3); |
|
1297
|
|
|
} |
|
1298
|
|
|
|
|
1299
|
|
|
} |
|
1300
|
|
|
} |
|
1301
|
|
|
foreach ($Distribution as $key => $value) { |
|
1302
|
|
|
ksort($Distribution[$key], SORT_NUMERIC); |
|
1303
|
|
|
} |
|
1304
|
|
|
ksort($Distribution['version'], SORT_STRING); |
|
1305
|
|
|
$info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate']; |
|
1306
|
|
|
$info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency']; |
|
1307
|
|
|
$info['mpeg']['audio']['layer_distribution'] = $Distribution['layer']; |
|
1308
|
|
|
$info['mpeg']['audio']['version_distribution'] = $Distribution['version']; |
|
1309
|
|
|
$info['mpeg']['audio']['padding_distribution'] = $Distribution['padding']; |
|
1310
|
|
|
if (count($Distribution['version']) > 1) { |
|
1311
|
|
|
$info['error'][] = 'Corrupt file - more than one MPEG version detected'; |
|
1312
|
|
|
} |
|
1313
|
|
|
if (count($Distribution['layer']) > 1) { |
|
1314
|
|
|
$info['error'][] = 'Corrupt file - more than one MPEG layer detected'; |
|
1315
|
|
|
} |
|
1316
|
|
|
if (count($Distribution['frequency']) > 1) { |
|
1317
|
|
|
$info['error'][] = 'Corrupt file - more than one MPEG sample rate detected'; |
|
1318
|
|
|
} |
|
1319
|
|
|
|
|
1320
|
|
|
|
|
1321
|
|
|
$bittotal = 0; |
|
1322
|
|
|
foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) { |
|
1323
|
|
|
if ($bitratevalue != 'free') { |
|
1324
|
|
|
$bittotal += ($bitratevalue * $bitratecount); |
|
1325
|
|
|
} |
|
1326
|
|
|
} |
|
1327
|
|
|
$info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']); |
|
1328
|
|
|
if ($info['mpeg']['audio']['frame_count'] == 0) { |
|
1329
|
|
|
$info['error'][] = 'no MPEG audio frames found'; |
|
1330
|
|
|
return false; |
|
1331
|
|
|
} |
|
1332
|
|
|
$info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']); |
|
1333
|
|
|
$info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr'); |
|
1334
|
|
|
$info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true); |
|
1335
|
|
|
|
|
1336
|
|
|
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; |
|
1337
|
|
|
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; |
|
1338
|
|
|
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; |
|
1339
|
|
|
$info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true); |
|
1340
|
|
|
$info['fileformat'] = $info['audio']['dataformat']; |
|
1341
|
|
|
|
|
1342
|
|
|
return true; |
|
1343
|
|
|
} |
|
1344
|
|
|
|
|
1345
|
|
|
|
|
1346
|
|
|
public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) { |
|
1347
|
|
|
// looks for synch, decodes MPEG audio header |
|
1348
|
|
|
|
|
1349
|
|
|
$info = &$this->getid3->info; |
|
1350
|
|
|
|
|
1351
|
|
|
static $MPEGaudioVersionLookup; |
|
1352
|
|
|
static $MPEGaudioLayerLookup; |
|
1353
|
|
|
static $MPEGaudioBitrateLookup; |
|
1354
|
|
|
if (empty($MPEGaudioVersionLookup)) { |
|
1355
|
|
|
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); |
|
1356
|
|
|
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); |
|
1357
|
|
|
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); |
|
1358
|
|
|
|
|
1359
|
|
|
} |
|
1360
|
|
|
|
|
1361
|
|
|
$this->fseek($avdataoffset); |
|
1362
|
|
|
$sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset); |
|
1363
|
|
|
if ($sync_seek_buffer_size <= 0) { |
|
1364
|
|
|
$info['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset; |
|
1365
|
|
|
return false; |
|
1366
|
|
|
} |
|
1367
|
|
|
$header = $this->fread($sync_seek_buffer_size); |
|
1368
|
|
|
$sync_seek_buffer_size = strlen($header); |
|
1369
|
|
|
$SynchSeekOffset = 0; |
|
1370
|
|
|
while ($SynchSeekOffset < $sync_seek_buffer_size) { |
|
1371
|
|
|
if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) { |
|
1372
|
|
|
|
|
1373
|
|
|
if ($SynchSeekOffset > $sync_seek_buffer_size) { |
|
1374
|
|
|
// if a synch's not found within the first 128k bytes, then give up |
|
1375
|
|
|
$info['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB'; |
|
1376
|
|
|
if (isset($info['audio']['bitrate'])) { |
|
1377
|
|
|
unset($info['audio']['bitrate']); |
|
1378
|
|
|
} |
|
1379
|
|
|
if (isset($info['mpeg']['audio'])) { |
|
1380
|
|
|
unset($info['mpeg']['audio']); |
|
1381
|
|
|
} |
|
1382
|
|
|
if (empty($info['mpeg'])) { |
|
1383
|
|
|
unset($info['mpeg']); |
|
1384
|
|
|
} |
|
1385
|
|
|
return false; |
|
1386
|
|
|
|
|
1387
|
|
|
} elseif (feof($this->getid3->fp)) { |
|
1388
|
|
|
|
|
1389
|
|
|
$info['error'][] = 'Could not find valid MPEG audio synch before end of file'; |
|
1390
|
|
|
if (isset($info['audio']['bitrate'])) { |
|
1391
|
|
|
unset($info['audio']['bitrate']); |
|
1392
|
|
|
} |
|
1393
|
|
|
if (isset($info['mpeg']['audio'])) { |
|
1394
|
|
|
unset($info['mpeg']['audio']); |
|
1395
|
|
|
} |
|
1396
|
|
|
if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) { |
|
1397
|
|
|
unset($info['mpeg']); |
|
1398
|
|
|
} |
|
1399
|
|
|
return false; |
|
1400
|
|
|
} |
|
1401
|
|
|
} |
|
1402
|
|
|
|
|
1403
|
|
|
if (($SynchSeekOffset + 1) >= strlen($header)) { |
|
1404
|
|
|
$info['error'][] = 'Could not find valid MPEG synch before end of file'; |
|
1405
|
|
|
return false; |
|
1406
|
|
|
} |
|
1407
|
|
|
|
|
1408
|
|
|
if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected |
|
1409
|
|
|
if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) { |
|
1410
|
|
|
$FirstFrameThisfileInfo = $info; |
|
1411
|
|
|
$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset; |
|
1412
|
|
|
if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) { |
|
1413
|
|
|
// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's |
|
1414
|
|
|
// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below |
|
1415
|
|
|
unset($FirstFrameThisfileInfo); |
|
1416
|
|
|
} |
|
1417
|
|
|
} |
|
1418
|
|
|
|
|
1419
|
|
|
$dummy = $info; // only overwrite real data if valid header found |
|
1420
|
|
|
if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) { |
|
1421
|
|
|
$info = $dummy; |
|
1422
|
|
|
$info['avdataoffset'] = $avdataoffset + $SynchSeekOffset; |
|
1423
|
|
|
switch (isset($info['fileformat']) ? $info['fileformat'] : '') { |
|
1424
|
|
|
case '': |
|
1425
|
|
|
case 'id3': |
|
1426
|
|
|
case 'ape': |
|
1427
|
|
|
case 'mp3': |
|
1428
|
|
|
$info['fileformat'] = 'mp3'; |
|
1429
|
|
|
$info['audio']['dataformat'] = 'mp3'; |
|
1430
|
|
|
break; |
|
1431
|
|
|
} |
|
1432
|
|
|
if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) { |
|
1433
|
|
|
if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) { |
|
1434
|
|
|
// If there is garbage data between a valid VBR header frame and a sequence |
|
1435
|
|
|
// of valid MPEG-audio frames the VBR data is no longer discarded. |
|
1436
|
|
|
$info = $FirstFrameThisfileInfo; |
|
1437
|
|
|
$info['avdataoffset'] = $FirstFrameAVDataOffset; |
|
1438
|
|
|
$info['fileformat'] = 'mp3'; |
|
1439
|
|
|
$info['audio']['dataformat'] = 'mp3'; |
|
1440
|
|
|
$dummy = $info; |
|
1441
|
|
|
unset($dummy['mpeg']['audio']); |
|
1442
|
|
|
$GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength']; |
|
1443
|
|
|
$GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset; |
|
1444
|
|
|
if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) { |
|
1445
|
|
|
$info = $dummy; |
|
1446
|
|
|
$info['avdataoffset'] = $GarbageOffsetEnd; |
|
1447
|
|
|
$info['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd; |
|
1448
|
|
|
} else { |
|
1449
|
|
|
$info['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')'; |
|
1450
|
|
|
} |
|
1451
|
|
|
} |
|
1452
|
|
|
} |
|
1453
|
|
|
if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) { |
|
1454
|
|
|
// VBR file with no VBR header |
|
1455
|
|
|
$BitrateHistogram = true; |
|
1456
|
|
|
} |
|
1457
|
|
|
|
|
1458
|
|
|
if ($BitrateHistogram) { |
|
1459
|
|
|
|
|
1460
|
|
|
$info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0); |
|
1461
|
|
|
$info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0); |
|
1462
|
|
|
|
|
1463
|
|
|
if ($info['mpeg']['audio']['version'] == '1') { |
|
1464
|
|
|
if ($info['mpeg']['audio']['layer'] == 3) { |
|
1465
|
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0); |
|
1466
|
|
|
} elseif ($info['mpeg']['audio']['layer'] == 2) { |
|
1467
|
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0); |
|
1468
|
|
|
} elseif ($info['mpeg']['audio']['layer'] == 1) { |
|
1469
|
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0); |
|
1470
|
|
|
} |
|
1471
|
|
|
} elseif ($info['mpeg']['audio']['layer'] == 1) { |
|
1472
|
|
|
$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); |
|
1473
|
|
|
} else { |
|
1474
|
|
|
$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); |
|
1475
|
|
|
} |
|
1476
|
|
|
|
|
1477
|
|
|
$dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); |
|
1478
|
|
|
$synchstartoffset = $info['avdataoffset']; |
|
1479
|
|
|
$this->fseek($info['avdataoffset']); |
|
1480
|
|
|
|
|
1481
|
|
|
// you can play with these numbers: |
|
1482
|
|
|
$max_frames_scan = 50000; |
|
1483
|
|
|
$max_scan_segments = 10; |
|
1484
|
|
|
|
|
1485
|
|
|
// don't play with these numbers: |
|
1486
|
|
|
$FastMode = false; |
|
1487
|
|
|
$SynchErrorsFound = 0; |
|
1488
|
|
|
$frames_scanned = 0; |
|
1489
|
|
|
$this_scan_segment = 0; |
|
1490
|
|
|
$frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments); |
|
1491
|
|
|
$pct_data_scanned = 0; |
|
1492
|
|
|
for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) { |
|
1493
|
|
|
$frames_scanned_this_segment = 0; |
|
1494
|
|
|
if ($this->ftell() >= $info['avdataend']) { |
|
1495
|
|
|
break; |
|
1496
|
|
|
} |
|
1497
|
|
|
$scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments))); |
|
1498
|
|
|
if ($current_segment > 0) { |
|
1499
|
|
|
$this->fseek($scan_start_offset[$current_segment]); |
|
1500
|
|
|
$buffer_4k = $this->fread(4096); |
|
1501
|
|
|
for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) { |
|
1502
|
|
|
if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected |
|
1503
|
|
|
if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) { |
|
1504
|
|
|
$calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength']; |
|
1505
|
|
|
if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) { |
|
1506
|
|
|
$scan_start_offset[$current_segment] += $j; |
|
1507
|
|
|
break; |
|
1508
|
|
|
} |
|
1509
|
|
|
} |
|
1510
|
|
|
} |
|
1511
|
|
|
} |
|
1512
|
|
|
} |
|
1513
|
|
|
$synchstartoffset = $scan_start_offset[$current_segment]; |
|
1514
|
|
|
while ($this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) { |
|
1515
|
|
|
$FastMode = true; |
|
1516
|
|
|
$thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']]; |
|
1517
|
|
|
|
|
1518
|
|
|
if (empty($dummy['mpeg']['audio']['framelength'])) { |
|
1519
|
|
|
$SynchErrorsFound++; |
|
1520
|
|
|
$synchstartoffset++; |
|
1521
|
|
|
} else { |
|
1522
|
|
|
getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]); |
|
1523
|
|
|
getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]); |
|
1524
|
|
|
getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]); |
|
1525
|
|
|
$synchstartoffset += $dummy['mpeg']['audio']['framelength']; |
|
1526
|
|
|
} |
|
1527
|
|
|
$frames_scanned++; |
|
1528
|
|
|
if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) { |
|
1529
|
|
|
$this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']); |
|
1530
|
|
|
if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) { |
|
1531
|
|
|
// file likely contains < $max_frames_scan, just scan as one segment |
|
1532
|
|
|
$max_scan_segments = 1; |
|
1533
|
|
|
$frames_scan_per_segment = $max_frames_scan; |
|
1534
|
|
|
} else { |
|
1535
|
|
|
$pct_data_scanned += $this_pct_scanned; |
|
1536
|
|
|
break; |
|
1537
|
|
|
} |
|
1538
|
|
|
} |
|
1539
|
|
|
} |
|
1540
|
|
|
} |
|
1541
|
|
|
if ($pct_data_scanned > 0) { |
|
1542
|
|
|
$info['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$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.'; |
|
1543
|
|
|
foreach ($info['mpeg']['audio'] as $key1 => $value1) { |
|
1544
|
|
|
if (!preg_match('#_distribution$#i', $key1)) { |
|
1545
|
|
|
continue; |
|
1546
|
|
|
} |
|
1547
|
|
|
foreach ($value1 as $key2 => $value2) { |
|
1548
|
|
|
$info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned); |
|
1549
|
|
|
} |
|
1550
|
|
|
} |
|
1551
|
|
|
} |
|
1552
|
|
|
|
|
1553
|
|
|
if ($SynchErrorsFound > 0) { |
|
1554
|
|
|
$info['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis'; |
|
1555
|
|
|
//return false; |
|
1556
|
|
|
} |
|
1557
|
|
|
|
|
1558
|
|
|
$bittotal = 0; |
|
1559
|
|
|
$framecounter = 0; |
|
1560
|
|
|
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) { |
|
1561
|
|
|
$framecounter += $bitratecount; |
|
1562
|
|
|
if ($bitratevalue != 'free') { |
|
1563
|
|
|
$bittotal += ($bitratevalue * $bitratecount); |
|
1564
|
|
|
} |
|
1565
|
|
|
} |
|
1566
|
|
|
if ($framecounter == 0) { |
|
1567
|
|
|
$info['error'][] = 'Corrupt MP3 file: framecounter == zero'; |
|
1568
|
|
|
return false; |
|
1569
|
|
|
} |
|
1570
|
|
|
$info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter); |
|
1571
|
|
|
$info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter); |
|
1572
|
|
|
|
|
1573
|
|
|
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; |
|
1574
|
|
|
|
|
1575
|
|
|
|
|
1576
|
|
|
// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently |
|
1577
|
|
|
$distinct_bitrates = 0; |
|
1578
|
|
|
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) { |
|
1579
|
|
|
if ($bitrate_count > 0) { |
|
1580
|
|
|
$distinct_bitrates++; |
|
1581
|
|
|
} |
|
1582
|
|
|
} |
|
1583
|
|
|
if ($distinct_bitrates > 1) { |
|
1584
|
|
|
$info['mpeg']['audio']['bitrate_mode'] = 'vbr'; |
|
1585
|
|
|
} else { |
|
1586
|
|
|
$info['mpeg']['audio']['bitrate_mode'] = 'cbr'; |
|
1587
|
|
|
} |
|
1588
|
|
|
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; |
|
1589
|
|
|
|
|
1590
|
|
|
} |
|
1591
|
|
|
|
|
1592
|
|
|
break; // exit while() |
|
1593
|
|
|
} |
|
1594
|
|
|
} |
|
1595
|
|
|
|
|
1596
|
|
|
$SynchSeekOffset++; |
|
1597
|
|
|
if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) { |
|
1598
|
|
|
// end of file/data |
|
1599
|
|
|
|
|
1600
|
|
|
if (empty($info['mpeg']['audio'])) { |
|
1601
|
|
|
|
|
1602
|
|
|
$info['error'][] = 'could not find valid MPEG synch before end of file'; |
|
1603
|
|
|
if (isset($info['audio']['bitrate'])) { |
|
1604
|
|
|
unset($info['audio']['bitrate']); |
|
1605
|
|
|
} |
|
1606
|
|
|
if (isset($info['mpeg']['audio'])) { |
|
1607
|
|
|
unset($info['mpeg']['audio']); |
|
1608
|
|
|
} |
|
1609
|
|
|
if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) { |
|
1610
|
|
|
unset($info['mpeg']); |
|
1611
|
|
|
} |
|
1612
|
|
|
return false; |
|
1613
|
|
|
|
|
1614
|
|
|
} |
|
1615
|
|
|
break; |
|
1616
|
|
|
} |
|
1617
|
|
|
|
|
1618
|
|
|
} |
|
1619
|
|
|
$info['audio']['channels'] = $info['mpeg']['audio']['channels']; |
|
1620
|
|
|
$info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode']; |
|
1621
|
|
|
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; |
|
1622
|
|
|
return true; |
|
1623
|
|
|
} |
|
1624
|
|
|
|
|
1625
|
|
|
|
|
1626
|
|
|
public static function MPEGaudioVersionArray() { |
|
1627
|
|
|
static $MPEGaudioVersion = array('2.5', false, '2', '1'); |
|
1628
|
|
|
return $MPEGaudioVersion; |
|
1629
|
|
|
} |
|
1630
|
|
|
|
|
1631
|
|
|
public static function MPEGaudioLayerArray() { |
|
1632
|
|
|
static $MPEGaudioLayer = array(false, 3, 2, 1); |
|
1633
|
|
|
return $MPEGaudioLayer; |
|
1634
|
|
|
} |
|
1635
|
|
|
|
|
1636
|
|
|
public static function MPEGaudioBitrateArray() { |
|
1637
|
|
|
static $MPEGaudioBitrate; |
|
1638
|
|
|
if (empty($MPEGaudioBitrate)) { |
|
1639
|
|
|
$MPEGaudioBitrate = array ( |
|
1640
|
|
|
'1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000), |
|
1641
|
|
|
2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000), |
|
1642
|
|
|
3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000) |
|
1643
|
|
|
), |
|
1644
|
|
|
|
|
1645
|
|
|
'2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000), |
|
1646
|
|
|
2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000), |
|
1647
|
|
|
) |
|
1648
|
|
|
); |
|
1649
|
|
|
$MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2]; |
|
1650
|
|
|
$MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2']; |
|
1651
|
|
|
} |
|
1652
|
|
|
return $MPEGaudioBitrate; |
|
1653
|
|
|
} |
|
1654
|
|
|
|
|
1655
|
|
|
public static function MPEGaudioFrequencyArray() { |
|
1656
|
|
|
static $MPEGaudioFrequency; |
|
1657
|
|
|
if (empty($MPEGaudioFrequency)) { |
|
1658
|
|
|
$MPEGaudioFrequency = array ( |
|
1659
|
|
|
'1' => array(44100, 48000, 32000), |
|
1660
|
|
|
'2' => array(22050, 24000, 16000), |
|
1661
|
|
|
'2.5' => array(11025, 12000, 8000) |
|
1662
|
|
|
); |
|
1663
|
|
|
} |
|
1664
|
|
|
return $MPEGaudioFrequency; |
|
1665
|
|
|
} |
|
1666
|
|
|
|
|
1667
|
|
|
public static function MPEGaudioChannelModeArray() { |
|
1668
|
|
|
static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono'); |
|
1669
|
|
|
return $MPEGaudioChannelMode; |
|
1670
|
|
|
} |
|
1671
|
|
|
|
|
1672
|
|
|
public static function MPEGaudioModeExtensionArray() { |
|
1673
|
|
|
static $MPEGaudioModeExtension; |
|
1674
|
|
|
if (empty($MPEGaudioModeExtension)) { |
|
1675
|
|
|
$MPEGaudioModeExtension = array ( |
|
1676
|
|
|
1 => array('4-31', '8-31', '12-31', '16-31'), |
|
1677
|
|
|
2 => array('4-31', '8-31', '12-31', '16-31'), |
|
1678
|
|
|
3 => array('', 'IS', 'MS', 'IS+MS') |
|
1679
|
|
|
); |
|
1680
|
|
|
} |
|
1681
|
|
|
return $MPEGaudioModeExtension; |
|
1682
|
|
|
} |
|
1683
|
|
|
|
|
1684
|
|
|
public static function MPEGaudioEmphasisArray() { |
|
1685
|
|
|
static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17'); |
|
1686
|
|
|
return $MPEGaudioEmphasis; |
|
1687
|
|
|
} |
|
1688
|
|
|
|
|
1689
|
|
|
public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) { |
|
1690
|
|
|
return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15); |
|
1691
|
|
|
} |
|
1692
|
|
|
|
|
1693
|
|
|
public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) { |
|
1694
|
|
|
if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) { |
|
1695
|
|
|
return false; |
|
1696
|
|
|
} |
|
1697
|
|
|
|
|
1698
|
|
|
static $MPEGaudioVersionLookup; |
|
1699
|
|
|
static $MPEGaudioLayerLookup; |
|
1700
|
|
|
static $MPEGaudioBitrateLookup; |
|
1701
|
|
|
static $MPEGaudioFrequencyLookup; |
|
1702
|
|
|
static $MPEGaudioChannelModeLookup; |
|
1703
|
|
|
static $MPEGaudioModeExtensionLookup; |
|
1704
|
|
|
static $MPEGaudioEmphasisLookup; |
|
1705
|
|
|
if (empty($MPEGaudioVersionLookup)) { |
|
1706
|
|
|
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); |
|
1707
|
|
|
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); |
|
1708
|
|
|
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); |
|
1709
|
|
|
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); |
|
1710
|
|
|
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); |
|
1711
|
|
|
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); |
|
1712
|
|
|
$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); |
|
1713
|
|
|
} |
|
1714
|
|
|
|
|
1715
|
|
|
if (isset($MPEGaudioVersionLookup[$rawarray['version']])) { |
|
1716
|
|
|
$decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']]; |
|
1717
|
|
|
} else { |
|
1718
|
|
|
echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : ''); |
|
1719
|
|
|
return false; |
|
1720
|
|
|
} |
|
1721
|
|
|
if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) { |
|
1722
|
|
|
$decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']]; |
|
1723
|
|
|
} else { |
|
1724
|
|
|
echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : ''); |
|
1725
|
|
|
return false; |
|
1726
|
|
|
} |
|
1727
|
|
|
if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) { |
|
1728
|
|
|
echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : ''); |
|
1729
|
|
|
if ($rawarray['bitrate'] == 15) { |
|
1730
|
|
|
// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0 |
|
1731
|
|
|
// let it go through here otherwise file will not be identified |
|
1732
|
|
|
if (!$allowBitrate15) { |
|
1733
|
|
|
return false; |
|
1734
|
|
|
} |
|
1735
|
|
|
} else { |
|
1736
|
|
|
return false; |
|
1737
|
|
|
} |
|
1738
|
|
|
} |
|
1739
|
|
|
if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) { |
|
1740
|
|
|
echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : ''); |
|
1741
|
|
|
return false; |
|
1742
|
|
|
} |
|
1743
|
|
|
if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) { |
|
1744
|
|
|
echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : ''); |
|
1745
|
|
|
return false; |
|
1746
|
|
|
} |
|
1747
|
|
|
if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) { |
|
1748
|
|
|
echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : ''); |
|
1749
|
|
|
return false; |
|
1750
|
|
|
} |
|
1751
|
|
|
if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) { |
|
1752
|
|
|
echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : ''); |
|
1753
|
|
|
return false; |
|
1754
|
|
|
} |
|
1755
|
|
|
// These are just either set or not set, you can't mess that up :) |
|
1756
|
|
|
// $rawarray['protection']; |
|
1757
|
|
|
// $rawarray['padding']; |
|
1758
|
|
|
// $rawarray['private']; |
|
1759
|
|
|
// $rawarray['copyright']; |
|
1760
|
|
|
// $rawarray['original']; |
|
1761
|
|
|
|
|
1762
|
|
|
return true; |
|
1763
|
|
|
} |
|
1764
|
|
|
|
|
1765
|
|
|
public static function MPEGaudioHeaderDecode($Header4Bytes) { |
|
1766
|
|
|
// AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM |
|
1767
|
|
|
// A - Frame sync (all bits set) |
|
1768
|
|
|
// B - MPEG Audio version ID |
|
1769
|
|
|
// C - Layer description |
|
1770
|
|
|
// D - Protection bit |
|
1771
|
|
|
// E - Bitrate index |
|
1772
|
|
|
// F - Sampling rate frequency index |
|
1773
|
|
|
// G - Padding bit |
|
1774
|
|
|
// H - Private bit |
|
1775
|
|
|
// I - Channel Mode |
|
1776
|
|
|
// J - Mode extension (Only if Joint stereo) |
|
1777
|
|
|
// K - Copyright |
|
1778
|
|
|
// L - Original |
|
1779
|
|
|
// M - Emphasis |
|
1780
|
|
|
|
|
1781
|
|
|
if (strlen($Header4Bytes) != 4) { |
|
1782
|
|
|
return false; |
|
1783
|
|
|
} |
|
1784
|
|
|
|
|
1785
|
|
|
$MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4; |
|
1786
|
|
|
$MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB |
|
1787
|
|
|
$MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC |
|
1788
|
|
|
$MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D |
|
1789
|
|
|
$MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE |
|
1790
|
|
|
$MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF |
|
1791
|
|
|
$MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G |
|
1792
|
|
|
$MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H |
|
1793
|
|
|
$MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II |
|
1794
|
|
|
$MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ |
|
1795
|
|
|
$MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K |
|
1796
|
|
|
$MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L |
|
1797
|
|
|
$MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM |
|
1798
|
|
|
|
|
1799
|
|
|
return $MPEGrawHeader; |
|
1800
|
|
|
} |
|
1801
|
|
|
|
|
1802
|
|
|
public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) { |
|
1803
|
|
|
static $AudioFrameLengthCache = array(); |
|
1804
|
|
|
|
|
1805
|
|
|
if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) { |
|
1806
|
|
|
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false; |
|
1807
|
|
|
if ($bitrate != 'free') { |
|
1808
|
|
|
|
|
1809
|
|
|
if ($version == '1') { |
|
1810
|
|
|
|
|
1811
|
|
|
if ($layer == '1') { |
|
1812
|
|
|
|
|
1813
|
|
|
// For Layer I slot is 32 bits long |
|
1814
|
|
|
$FrameLengthCoefficient = 48; |
|
1815
|
|
|
$SlotLength = 4; |
|
1816
|
|
|
|
|
1817
|
|
|
} else { // Layer 2 / 3 |
|
1818
|
|
|
|
|
1819
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long. |
|
1820
|
|
|
$FrameLengthCoefficient = 144; |
|
1821
|
|
|
$SlotLength = 1; |
|
1822
|
|
|
|
|
1823
|
|
|
} |
|
1824
|
|
|
|
|
1825
|
|
|
} else { // MPEG-2 / MPEG-2.5 |
|
1826
|
|
|
|
|
1827
|
|
|
if ($layer == '1') { |
|
1828
|
|
|
|
|
1829
|
|
|
// For Layer I slot is 32 bits long |
|
1830
|
|
|
$FrameLengthCoefficient = 24; |
|
1831
|
|
|
$SlotLength = 4; |
|
1832
|
|
|
|
|
1833
|
|
|
} elseif ($layer == '2') { |
|
1834
|
|
|
|
|
1835
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long. |
|
1836
|
|
|
$FrameLengthCoefficient = 144; |
|
1837
|
|
|
$SlotLength = 1; |
|
1838
|
|
|
|
|
1839
|
|
|
} else { // layer 3 |
|
1840
|
|
|
|
|
1841
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long. |
|
1842
|
|
|
$FrameLengthCoefficient = 72; |
|
1843
|
|
|
$SlotLength = 1; |
|
1844
|
|
|
|
|
1845
|
|
|
} |
|
1846
|
|
|
|
|
1847
|
|
|
} |
|
1848
|
|
|
|
|
1849
|
|
|
// FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding |
|
1850
|
|
|
if ($samplerate > 0) { |
|
1851
|
|
|
$NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate; |
|
1852
|
|
|
$NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I) |
|
1853
|
|
|
if ($padding) { |
|
1854
|
|
|
$NewFramelength += $SlotLength; |
|
1855
|
|
|
} |
|
1856
|
|
|
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength; |
|
1857
|
|
|
} |
|
1858
|
|
|
} |
|
1859
|
|
|
} |
|
1860
|
|
|
return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate]; |
|
1861
|
|
|
} |
|
1862
|
|
|
|
|
1863
|
|
|
public static function ClosestStandardMP3Bitrate($bit_rate) { |
|
1864
|
|
|
static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000); |
|
1865
|
|
|
static $bit_rate_table = array (0=>'-'); |
|
1866
|
|
|
$round_bit_rate = intval(round($bit_rate, -3)); |
|
1867
|
|
|
if (!isset($bit_rate_table[$round_bit_rate])) { |
|
1868
|
|
|
if ($round_bit_rate > max($standard_bit_rates)) { |
|
1869
|
|
|
$bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate)); |
|
1870
|
|
|
} else { |
|
1871
|
|
|
$bit_rate_table[$round_bit_rate] = max($standard_bit_rates); |
|
1872
|
|
|
foreach ($standard_bit_rates as $standard_bit_rate) { |
|
1873
|
|
|
if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) { |
|
1874
|
|
|
break; |
|
1875
|
|
|
} |
|
1876
|
|
|
$bit_rate_table[$round_bit_rate] = $standard_bit_rate; |
|
1877
|
|
|
} |
|
1878
|
|
|
} |
|
1879
|
|
|
} |
|
1880
|
|
|
return $bit_rate_table[$round_bit_rate]; |
|
1881
|
|
|
} |
|
1882
|
|
|
|
|
1883
|
|
|
public static function XingVBRidOffset($version, $channelmode) { |
|
1884
|
|
|
static $XingVBRidOffsetCache = array(); |
|
1885
|
|
|
if (empty($XingVBRidOffset)) { |
|
1886
|
|
|
$XingVBRidOffset = array ( |
|
1887
|
|
|
'1' => array ('mono' => 0x15, // 4 + 17 = 21 |
|
1888
|
|
|
'stereo' => 0x24, // 4 + 32 = 36 |
|
1889
|
|
|
'joint stereo' => 0x24, |
|
1890
|
|
|
'dual channel' => 0x24 |
|
1891
|
|
|
), |
|
1892
|
|
|
|
|
1893
|
|
|
'2' => array ('mono' => 0x0D, // 4 + 9 = 13 |
|
1894
|
|
|
'stereo' => 0x15, // 4 + 17 = 21 |
|
1895
|
|
|
'joint stereo' => 0x15, |
|
1896
|
|
|
'dual channel' => 0x15 |
|
1897
|
|
|
), |
|
1898
|
|
|
|
|
1899
|
|
|
'2.5' => array ('mono' => 0x15, |
|
1900
|
|
|
'stereo' => 0x15, |
|
1901
|
|
|
'joint stereo' => 0x15, |
|
1902
|
|
|
'dual channel' => 0x15 |
|
1903
|
|
|
) |
|
1904
|
|
|
); |
|
1905
|
|
|
} |
|
1906
|
|
|
return $XingVBRidOffset[$version][$channelmode]; |
|
1907
|
|
|
} |
|
1908
|
|
|
|
|
1909
|
|
|
public static function LAMEvbrMethodLookup($VBRmethodID) { |
|
1910
|
|
|
static $LAMEvbrMethodLookup = array( |
|
1911
|
|
|
0x00 => 'unknown', |
|
1912
|
|
|
0x01 => 'cbr', |
|
1913
|
|
|
0x02 => 'abr', |
|
1914
|
|
|
0x03 => 'vbr-old / vbr-rh', |
|
1915
|
|
|
0x04 => 'vbr-new / vbr-mtrh', |
|
1916
|
|
|
0x05 => 'vbr-mt', |
|
1917
|
|
|
0x06 => 'vbr (full vbr method 4)', |
|
1918
|
|
|
0x08 => 'cbr (constant bitrate 2 pass)', |
|
1919
|
|
|
0x09 => 'abr (2 pass)', |
|
1920
|
|
|
0x0F => 'reserved' |
|
1921
|
|
|
); |
|
1922
|
|
|
return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : ''); |
|
1923
|
|
|
} |
|
1924
|
|
|
|
|
1925
|
|
|
public static function LAMEmiscStereoModeLookup($StereoModeID) { |
|
1926
|
|
|
static $LAMEmiscStereoModeLookup = array( |
|
1927
|
|
|
0 => 'mono', |
|
1928
|
|
|
1 => 'stereo', |
|
1929
|
|
|
2 => 'dual mono', |
|
1930
|
|
|
3 => 'joint stereo', |
|
1931
|
|
|
4 => 'forced stereo', |
|
1932
|
|
|
5 => 'auto', |
|
1933
|
|
|
6 => 'intensity stereo', |
|
1934
|
|
|
7 => 'other' |
|
1935
|
|
|
); |
|
1936
|
|
|
return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : ''); |
|
1937
|
|
|
} |
|
1938
|
|
|
|
|
1939
|
|
|
public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) { |
|
1940
|
|
|
static $LAMEmiscSourceSampleFrequencyLookup = array( |
|
1941
|
|
|
0 => '<= 32 kHz', |
|
1942
|
|
|
1 => '44.1 kHz', |
|
1943
|
|
|
2 => '48 kHz', |
|
1944
|
|
|
3 => '> 48kHz' |
|
1945
|
|
|
); |
|
1946
|
|
|
return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : ''); |
|
1947
|
|
|
} |
|
1948
|
|
|
|
|
1949
|
|
|
public static function LAMEsurroundInfoLookup($SurroundInfoID) { |
|
1950
|
|
|
static $LAMEsurroundInfoLookup = array( |
|
1951
|
|
|
0 => 'no surround info', |
|
1952
|
|
|
1 => 'DPL encoding', |
|
1953
|
|
|
2 => 'DPL2 encoding', |
|
1954
|
|
|
3 => 'Ambisonic encoding' |
|
1955
|
|
|
); |
|
1956
|
|
|
return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved'); |
|
1957
|
|
|
} |
|
1958
|
|
|
|
|
1959
|
|
|
public static function LAMEpresetUsedLookup($LAMEtag) { |
|
1960
|
|
|
|
|
1961
|
|
|
if ($LAMEtag['preset_used_id'] == 0) { |
|
1962
|
|
|
// no preset used (LAME >=3.93) |
|
1963
|
|
|
// no preset recorded (LAME <3.93) |
|
1964
|
|
|
return ''; |
|
1965
|
|
|
} |
|
1966
|
|
|
$LAMEpresetUsedLookup = array(); |
|
1967
|
|
|
|
|
1968
|
|
|
///// THIS PART CANNOT BE STATIC . |
|
1969
|
|
|
for ($i = 8; $i <= 320; $i++) { |
|
1970
|
|
|
switch ($LAMEtag['vbr_method']) { |
|
1971
|
|
|
case 'cbr': |
|
1972
|
|
|
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i; |
|
1973
|
|
|
break; |
|
1974
|
|
|
case 'abr': |
|
1975
|
|
|
default: // other VBR modes shouldn't be here(?) |
|
1976
|
|
|
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$i; |
|
1977
|
|
|
break; |
|
1978
|
|
|
} |
|
1979
|
|
|
} |
|
1980
|
|
|
|
|
1981
|
|
|
// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions() |
|
1982
|
|
|
|
|
1983
|
|
|
// named alt-presets |
|
1984
|
|
|
$LAMEpresetUsedLookup[1000] = '--r3mix'; |
|
1985
|
|
|
$LAMEpresetUsedLookup[1001] = '--alt-preset standard'; |
|
1986
|
|
|
$LAMEpresetUsedLookup[1002] = '--alt-preset extreme'; |
|
1987
|
|
|
$LAMEpresetUsedLookup[1003] = '--alt-preset insane'; |
|
1988
|
|
|
$LAMEpresetUsedLookup[1004] = '--alt-preset fast standard'; |
|
1989
|
|
|
$LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme'; |
|
1990
|
|
|
$LAMEpresetUsedLookup[1006] = '--alt-preset medium'; |
|
1991
|
|
|
$LAMEpresetUsedLookup[1007] = '--alt-preset fast medium'; |
|
1992
|
|
|
|
|
1993
|
|
|
// LAME 3.94 additions/changes |
|
1994
|
|
|
$LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003 |
|
1995
|
|
|
$LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003 |
|
1996
|
|
|
|
|
1997
|
|
|
$LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003 |
|
1998
|
|
|
$LAMEpresetUsedLookup[410] = '-V9'; |
|
1999
|
|
|
$LAMEpresetUsedLookup[420] = '-V8'; |
|
2000
|
|
|
$LAMEpresetUsedLookup[440] = '-V6'; |
|
2001
|
|
|
$LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003 |
|
2002
|
|
|
$LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003 |
|
2003
|
|
|
$LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003 |
|
2004
|
|
|
$LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003 |
|
2005
|
|
|
$LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003 |
|
2006
|
|
|
$LAMEpresetUsedLookup[490] = '-V1'; |
|
2007
|
|
|
$LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003 |
|
2008
|
|
|
|
|
2009
|
|
|
return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to [email protected]'); |
|
2010
|
|
|
} |
|
2011
|
|
|
|
|
2012
|
|
|
} |
|
2013
|
|
|
|
ntwb /
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