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module.audio.mp3.php
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<?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at http://getid3.sourceforge.net // // or http://www.getid3.org // // also https://github.com/JamesHeinrich/getID3 // ///////////////////////////////////////////////////////////////// // See readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.audio.mp3.php // // module for analyzing MP3 files // // dependencies: NONE // // /// ///////////////////////////////////////////////////////////////// // number of frames to scan to determine if MPEG-audio sequence is valid // Lower this number to 5-20 for faster scanning // Increase this number to 50+ for most accurate detection of valid VBR/CBR // mpeg-audio streams define('GETID3_MP3_VALID_CHECK_FRAMES', 35); class getid3_mp3 extends getid3_handler { 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 public function Analyze() { $info = &$this->getid3->info; $initialOffset = $info['avdataoffset']; if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) { if ($this->allow_bruteforce) { $this->error('Rescanning file in BruteForce mode'); $this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info); } } if (isset($info['mpeg']['audio']['bitrate_mode'])) { $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']); } if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) { $synchoffsetwarning = 'Unknown data before synch '; if (isset($info['id3v2']['headerlength'])) { $synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, '; } elseif ($initialOffset > 0) { $synchoffsetwarning .= '(should be at '.$initialOffset.', '; } else { $synchoffsetwarning .= '(should be at beginning of file, '; } $synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')'; if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) { if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) { $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.'; $info['audio']['codec'] = 'LAME'; $CurrentDataLAMEversionString = 'LAME3.'; } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) { $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.'; $info['audio']['codec'] = 'LAME'; $CurrentDataLAMEversionString = 'LAME3.'; } } $this->warning($synchoffsetwarning); } if (isset($info['mpeg']['audio']['LAME'])) { $info['audio']['codec'] = 'LAME'; if (!empty($info['mpeg']['audio']['LAME']['long_version'])) { $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00"); } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) { $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00"); } } $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : '')); if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) { // a version number of LAME that does not end with a number like "LAME3.92" // or with a closing parenthesis like "LAME3.88 (alpha)" // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92) // not sure what the actual last frame length will be, but will be less than or equal to 1441 $PossiblyLongerLAMEversion_FrameLength = 1441; // Not sure what version of LAME this is - look in padding of last frame for longer version string $PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength; $this->fseek($PossibleLAMEversionStringOffset); $PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength); switch (substr($CurrentDataLAMEversionString, -1)) { case 'a': case 'b': // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example // need to trim off "a" to match longer string $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1); break; } if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) { if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) { $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)" if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) { $info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString; } } } } if (!empty($info['audio']['encoder'])) { $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 "); } switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') { case 1: case 2: $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer']; break; } if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) { switch ($info['audio']['dataformat']) { case 'mp1': case 'mp2': case 'mp3': $info['fileformat'] = $info['audio']['dataformat']; break; default: $this->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"'); break; } } if (empty($info['fileformat'])) { unset($info['fileformat']); unset($info['audio']['bitrate_mode']); unset($info['avdataoffset']); unset($info['avdataend']); return false; } $info['mime_type'] = 'audio/mpeg'; $info['audio']['lossless'] = false; // Calculate playtime if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) { $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate']; } $info['audio']['encoder_options'] = $this->GuessEncoderOptions(); return true; } public function GuessEncoderOptions() { // shortcuts $info = &$this->getid3->info; if (!empty($info['mpeg']['audio'])) { $thisfile_mpeg_audio = &$info['mpeg']['audio']; if (!empty($thisfile_mpeg_audio['LAME'])) { $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; } } $encoder_options = ''; static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256); if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) { $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality']; } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) { $encoder_options = $thisfile_mpeg_audio_lame['preset_used']; } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) { static $KnownEncoderValues = array(); if (empty($KnownEncoderValues)) { //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name'; $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95 } if (isset($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']])) { $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']]; } 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']])) { $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']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; } elseif ($info['audio']['bitrate_mode'] == 'vbr') { // http://gabriel.mp3-tech.org/mp3infotag.html // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10); $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10); $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value; } elseif ($info['audio']['bitrate_mode'] == 'cbr') { $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); } else { $encoder_options = strtoupper($info['audio']['bitrate_mode']); } } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr']; } elseif (!empty($info['audio']['bitrate'])) { if ($info['audio']['bitrate_mode'] == 'cbr') { $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); } else { $encoder_options = strtoupper($info['audio']['bitrate_mode']); } } if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min']; } if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) { $encoder_options .= ' --nogap'; } if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) { $ExplodedOptions = explode(' ', $encoder_options, 4); if ($ExplodedOptions[0] == '--r3mix') { $ExplodedOptions[1] = 'r3mix'; } switch ($ExplodedOptions[0]) { case '--preset': case '--alt-preset': case '--r3mix': if ($ExplodedOptions[1] == 'fast') { $ExplodedOptions[1] .= ' '.$ExplodedOptions[2]; } switch ($ExplodedOptions[1]) { case 'portable': case 'medium': case 'standard': case 'extreme': case 'insane': case 'fast portable': case 'fast medium': case 'fast standard': case 'fast extreme': case 'fast insane': case 'r3mix': static $ExpectedLowpass = array( 'insane|20500' => 20500, 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91 'medium|18000' => 18000, 'fast medium|18000' => 18000, 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 'standard|19000' => 19000, 'fast standard|19000' => 19000, 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91 'r3mix|18000' => 18000, // 3.94, 3.95 ); if (!isset($ExpectedLowpass[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000))) { $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency']; } break; default: break; } break; } } if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) { $encoder_options .= ' --resample 44100'; } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) { $encoder_options .= ' --resample 48000'; } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) { switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) { case 0: // <= 32000 // may or may not be same as source frequency - ignore break; case 1: // 44100 case 2: // 48000 case 3: // 48000+ $ExplodedOptions = explode(' ', $encoder_options, 4); switch ($ExplodedOptions[0]) { case '--preset': case '--alt-preset': switch ($ExplodedOptions[1]) { case 'fast': case 'portable': case 'medium': case 'standard': case 'extreme': case 'insane': $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; break; default: static $ExpectedResampledRate = array( 'phon+/lw/mw-eu/sw|16000' => 16000, 'mw-us|24000' => 24000, // 3.95 'mw-us|32000' => 32000, // 3.93 'mw-us|16000' => 16000, // 3.92 'phone|16000' => 16000, 'phone|11025' => 11025, // 3.94a15 'radio|32000' => 32000, // 3.94a15 'fm/radio|32000' => 32000, // 3.92 'fm|32000' => 32000, // 3.90 'voice|32000' => 32000); if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) { $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; } break; } break; case '--r3mix': default: $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; break; } break; } } } if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) { //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); $encoder_options = strtoupper($info['audio']['bitrate_mode']); } return $encoder_options; } public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) { static $MPEGaudioVersionLookup; static $MPEGaudioLayerLookup; static $MPEGaudioBitrateLookup; static $MPEGaudioFrequencyLookup; static $MPEGaudioChannelModeLookup; static $MPEGaudioModeExtensionLookup; static $MPEGaudioEmphasisLookup; if (empty($MPEGaudioVersionLookup)) { $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); } if ($this->fseek($offset) != 0) { $this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$offset); return false; } //$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame $headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data // MP3 audio frame structure: // $aa $aa $aa $aa [$bb $bb] $cc... // where $aa..$aa is the four-byte mpeg-audio header (below) // $bb $bb is the optional 2-byte CRC // and $cc... is the audio data $head4 = substr($headerstring, 0, 4); $head4_key = getid3_lib::PrintHexBytes($head4, true, false, false); static $MPEGaudioHeaderDecodeCache = array(); if (isset($MPEGaudioHeaderDecodeCache[$head4_key])) { $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4_key]; } else { $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4); $MPEGaudioHeaderDecodeCache[$head4_key] = $MPEGheaderRawArray; } static $MPEGaudioHeaderValidCache = array(); if (!isset($MPEGaudioHeaderValidCache[$head4_key])) { // Not in cache //$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1) $MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false); } // shortcut if (!isset($info['mpeg']['audio'])) { $info['mpeg']['audio'] = array(); } $thisfile_mpeg_audio = &$info['mpeg']['audio']; if ($MPEGaudioHeaderValidCache[$head4_key]) { $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray; } else { $this->error('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset); return false; } if (!$FastMPEGheaderScan) { $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']]; $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']]; $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']]; $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2); $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']]; $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection']; $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private']; $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']]; $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright']; $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original']; $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']]; $info['audio']['channels'] = $thisfile_mpeg_audio['channels']; $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; if ($thisfile_mpeg_audio['protection']) { $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2)); } } if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) { // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 $this->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1'); $thisfile_mpeg_audio['raw']['bitrate'] = 0; } $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding']; $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) { // only skip multiple frame check if free-format bitstream found at beginning of file // otherwise is quite possibly simply corrupted data $recursivesearch = false; } // For Layer 2 there are some combinations of bitrate and mode which are not allowed. if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) { $info['audio']['dataformat'] = 'mp2'; switch ($thisfile_mpeg_audio['channelmode']) { case 'mono': if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { // these are ok } else { $this->error($thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'); return false; } break; case 'stereo': case 'joint stereo': case 'dual channel': if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { // these are ok } else { $this->error(intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'); return false; } break; } } if ($info['audio']['sample_rate'] > 0) { $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']); } $nextframetestoffset = $offset + 1; if ($thisfile_mpeg_audio['bitrate'] != 'free') { $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; if (isset($thisfile_mpeg_audio['framelength'])) { $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength']; } else { $this->error('Frame at offset('.$offset.') is has an invalid frame length.'); return false; } } $ExpectedNumberOfAudioBytes = 0; //////////////////////////////////////////////////////////////////////////////////// // Variable-bitrate headers if (substr($headerstring, 4 + 32, 4) == 'VBRI') { // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; $info['audio']['codec'] = 'Fraunhofer'; $SideInfoData = substr($headerstring, 4 + 2, 32); $FraunhoferVBROffset = 36; $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes']; $previousbyteoffset = $offset; for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes'])); $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes']; $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']); $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset; $previousbyteoffset += $Fraunhofer_OffsetN; } } else { // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36) // depending on MPEG layer and number of channels $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4); if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) { // 'Xing' is traditional Xing VBR frame // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) // 'Info' *can* legally be used to specify a VBR file as well, however. // http://www.multiweb.cz/twoinches/MP3inside.htm //00..03 = "Xing" or "Info" //04..07 = Flags: // 0x01 Frames Flag set if value for number of frames in file is stored // 0x02 Bytes Flag set if value for filesize in bytes is stored // 0x04 TOC Flag set if values for TOC are stored // 0x08 VBR Scale Flag set if values for VBR scale is stored //08..11 Frames: Number of frames in file (including the first Xing/Info one) //12..15 Bytes: File length in Bytes //16..115 TOC (Table of Contents): // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. // Each Byte has a value according this formula: // (TOC[i] / 256) * fileLenInBytes // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use: // TOC[(60/240)*100] = TOC[25] // and corresponding Byte in file is then approximately at: // (TOC[25]/256) * 5000000 //116..119 VBR Scale // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME // if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') { $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; $thisfile_mpeg_audio['VBR_method'] = 'Xing'; // } else { // $ScanAsCBR = true; // $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; // } $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4)); $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); if ($thisfile_mpeg_audio['xing_flags']['frames']) { $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4)); //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame } if ($thisfile_mpeg_audio['xing_flags']['bytes']) { $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4)); } //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { //if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { if (!empty($thisfile_mpeg_audio['VBR_frames'])) { $used_filesize = 0; if (!empty($thisfile_mpeg_audio['VBR_bytes'])) { $used_filesize = $thisfile_mpeg_audio['VBR_bytes']; } elseif (!empty($info['filesize'])) { $used_filesize = $info['filesize']; $used_filesize -= intval(@$info['id3v2']['headerlength']); $used_filesize -= (isset($info['id3v1']) ? 128 : 0); $used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0); $this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes'); } $framelengthfloat = $used_filesize / $thisfile_mpeg_audio['VBR_frames']; if ($thisfile_mpeg_audio['layer'] == '1') { // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12; } else { // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144; } $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat); } if ($thisfile_mpeg_audio['xing_flags']['toc']) { $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100); for ($i = 0; $i < 100; $i++) { $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData[$i]); } } if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4)); } // http://gabriel.mp3-tech.org/mp3infotag.html if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') { // shortcut $thisfile_mpeg_audio['LAME'] = array(); $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20); $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9); if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') { // extra 11 chars are not part of version string when LAMEtag present unset($thisfile_mpeg_audio_lame['long_version']); // It the LAME tag was only introduced in LAME v3.90 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html // are assuming a 'Xing' identifier offset of 0x24, which is the case for // MPEG-1 non-mono, but not for other combinations $LAMEtagOffsetContant = $VBRidOffset - 0x24; // shortcuts $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array()); $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD']; $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track']; $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album']; $thisfile_mpeg_audio_lame['raw'] = array(); $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw']; // byte $9B VBR Quality // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications. // Actually overwrites original Xing bytes unset($thisfile_mpeg_audio['VBR_scale']); $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1)); // bytes $9C-$A4 Encoder short VersionString $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9); // byte $A5 Info Tag revision + VBR method $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1)); $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4; $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F; $thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']); $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr' // byte $A6 Lowpass filter value $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100; // bytes $A7-$AE Replay Gain // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') { // LAME 3.94a16 and later - 9.23 fixed point // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608); } else { // LAME 3.94a15 and earlier - 32-bit floating point // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4)); } if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) { unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); } else { $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); } $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2)); $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2)); if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) { $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13; $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10; $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9; $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF; $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']); $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']); $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']); if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; } $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator']; $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db']; } else { unset($thisfile_mpeg_audio_lame_RGAD['track']); } if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) { $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']); $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']); $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']); if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; } $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator']; $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db']; } else { unset($thisfile_mpeg_audio_lame_RGAD['album']); } if (empty($thisfile_mpeg_audio_lame_RGAD)) { unset($thisfile_mpeg_audio_lame['RGAD']); } // byte $AF Encoding flags + ATH Type $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1)); $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10); $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20); $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40); $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80); $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F; // byte $B0 if ABR {specified bitrate} else {minimal bitrate} $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1)); if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR) $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR) // ignore } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; } // bytes $B1-$B3 Encoder delays $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3)); $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12; $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF; // byte $B4 Misc $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1)); $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03); $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2; $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5; $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6; $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping']; $thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality']; $thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']); // byte $B5 MP3 Gain $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true); $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain']; $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6)); // bytes $B6-$B7 Preset and surround info $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2)); // Reserved = ($PresetSurroundBytes & 0xC000); $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800); $thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); $thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { $this->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org'); } if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) { // this may change if 3.90.4 ever comes out $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3'; } // bytes $B8-$BB MusicLength $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4)); $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); // bytes $BC-$BD MusicCRC $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2)); // bytes $BE-$BF CRC-16 of Info Tag $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2)); // LAME CBR if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) { // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min']; //} } } } } else { // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; if ($recursivesearch) { $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) { $recursivesearch = false; $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; } if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { $this->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'); } } } } if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) { if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) { if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) { // ignore, audio data is broken into chunks so will always be data "missing" } elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) { $this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'); } else { $this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)'); } } else { if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) { // $prenullbytefileoffset = $this->ftell(); // $this->fseek($info['avdataend']); // $PossibleNullByte = $this->fread(1); // $this->fseek($prenullbytefileoffset); // if ($PossibleNullByte === "\x00") { $info['avdataend']--; // $this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored'); // } else { // $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'); // } } else { $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'); } } } if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) { if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { $framebytelength = $this->FreeFormatFrameLength($offset, true); if ($framebytelength > 0) { $thisfile_mpeg_audio['framelength'] = $framebytelength; if ($thisfile_mpeg_audio['layer'] == '1') { // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; } else { // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; } } else { $this->error('Error calculating frame length of free-format MP3 without Xing/LAME header'); } } } if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') { switch ($thisfile_mpeg_audio['bitrate_mode']) { case 'vbr': case 'abr': $bytes_per_frame = 1152; if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) { $bytes_per_frame = 384; } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) { $bytes_per_frame = 576; } $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0); if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion } break; } } // End variable-bitrate headers //////////////////////////////////////////////////////////////////////////////////// if ($recursivesearch) { if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) { return false; } } //if (false) { // // experimental side info parsing section - not returning anything useful yet // // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData); // $SideInfoOffset = 0; // // if ($thisfile_mpeg_audio['version'] == '1') { // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { // // MPEG-1 (mono) // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); // $SideInfoOffset += 9; // $SideInfoOffset += 5; // } else { // // MPEG-1 (stereo, joint-stereo, dual-channel) // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); // $SideInfoOffset += 9; // $SideInfoOffset += 3; // } // } else { // 2 or 2.5 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { // // MPEG-2, MPEG-2.5 (mono) // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); // $SideInfoOffset += 8; // $SideInfoOffset += 1; // } else { // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel) // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); // $SideInfoOffset += 8; // $SideInfoOffset += 2; // } // } // // if ($thisfile_mpeg_audio['version'] == '1') { // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) { // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 2; // } // } // } // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) { // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12); // $SideInfoOffset += 12; // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); // $SideInfoOffset += 9; // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8); // $SideInfoOffset += 8; // if ($thisfile_mpeg_audio['version'] == '1') { // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); // $SideInfoOffset += 4; // } else { // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); // $SideInfoOffset += 9; // } // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 1; // // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') { // // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2); // $SideInfoOffset += 2; // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 1; // // for ($region = 0; $region < 2; $region++) { // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); // $SideInfoOffset += 5; // } // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0; // // for ($window = 0; $window < 3; $window++) { // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3); // $SideInfoOffset += 3; // } // // } else { // // for ($region = 0; $region < 3; $region++) { // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); // $SideInfoOffset += 5; // } // // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); // $SideInfoOffset += 4; // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3); // $SideInfoOffset += 3; // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0; // } // // if ($thisfile_mpeg_audio['version'] == '1') { // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 1; // } // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 1; // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 1; // } // } //} return true; } public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) { $info = &$this->getid3->info; $firstframetestarray = array('error' => array(), 'warning'=> array(), 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']); $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false); for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) { // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch if (($nextframetestoffset + 4) >= $info['avdataend']) { // end of file return true; } $nextframetestarray = array('error' => array(), 'warning' => array(), 'avdataend' => $info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) { if ($ScanAsCBR) { // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) { return false; } } // next frame is OK, get ready to check the one after that if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) { $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength']; } else { $this->error('Frame at offset ('.$offset.') is has an invalid frame length.'); return false; } } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) { // it's not the end of the file, but there's not enough data left for another frame, so assume it's garbage/padding and return OK return true; } else { // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence $this->warning('Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.'); return false; } } return true; } public function FreeFormatFrameLength($offset, $deepscan=false) { $info = &$this->getid3->info; $this->fseek($offset); $MPEGaudioData = $this->fread(32768); $SyncPattern1 = substr($MPEGaudioData, 0, 4); // may be different pattern due to padding $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) | 0x02).$SyncPattern1[3]; if ($SyncPattern2 === $SyncPattern1) { $SyncPattern2 = $SyncPattern1[0].$SyncPattern1[1].chr(ord($SyncPattern1[2]) & 0xFD).$SyncPattern1[3]; } $framelength = false; $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4); $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4); if ($framelength1 > 4) { $framelength = $framelength1; } if (($framelength2 > 4) && ($framelength2 < $framelength1)) { $framelength = $framelength2; } if (!$framelength) { // LAME 3.88 has a different value for modeextension on the first frame vs the rest $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4); $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4); if ($framelength1 > 4) { $framelength = $framelength1; } if (($framelength2 > 4) && ($framelength2 < $framelength1)) { $framelength = $framelength2; } if (!$framelength) { $this->error('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset); return false; } else { $this->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'); $info['audio']['codec'] = 'LAME'; $info['audio']['encoder'] = 'LAME3.88'; $SyncPattern1 = substr($SyncPattern1, 0, 3); $SyncPattern2 = substr($SyncPattern2, 0, 3); } } if ($deepscan) { $ActualFrameLengthValues = array(); $nextoffset = $offset + $framelength; while ($nextoffset < ($info['avdataend'] - 6)) { $this->fseek($nextoffset - 1); $NextSyncPattern = $this->fread(6); if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) { // good - found where expected $ActualFrameLengthValues[] = $framelength; } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) { // ok - found one byte earlier than expected (last frame wasn't padded, first frame was) $ActualFrameLengthValues[] = ($framelength - 1); $nextoffset--; } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) { // ok - found one byte later than expected (last frame was padded, first frame wasn't) $ActualFrameLengthValues[] = ($framelength + 1); $nextoffset++; } else { $this->error('Did not find expected free-format sync pattern at offset '.$nextoffset); return false; } $nextoffset += $framelength; } if (count($ActualFrameLengthValues) > 0) { $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues))); } } return $framelength; } public function getOnlyMPEGaudioInfoBruteForce() { $MPEGaudioHeaderDecodeCache = array(); $MPEGaudioHeaderValidCache = array(); $MPEGaudioHeaderLengthCache = array(); $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); $LongMPEGversionLookup = array(); $LongMPEGlayerLookup = array(); $LongMPEGbitrateLookup = array(); $LongMPEGpaddingLookup = array(); $LongMPEGfrequencyLookup = array(); $Distribution['bitrate'] = array(); $Distribution['frequency'] = array(); $Distribution['layer'] = array(); $Distribution['version'] = array(); $Distribution['padding'] = array(); $info = &$this->getid3->info; $this->fseek($info['avdataoffset']); $max_frames_scan = 5000; $frames_scanned = 0; $previousvalidframe = $info['avdataoffset']; while ($this->ftell() < $info['avdataend']) { set_time_limit(30); $head4 = $this->fread(4); if (strlen($head4) < 4) { break; } if ($head4[0] != "\xFF") { for ($i = 1; $i < 4; $i++) { if ($head4[$i] == "\xFF") { $this->fseek($i - 4, SEEK_CUR); continue 2; } } continue; } if (!isset($MPEGaudioHeaderDecodeCache[$head4])) { $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4); } if (!isset($MPEGaudioHeaderValidCache[$head4])) { $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false); } if ($MPEGaudioHeaderValidCache[$head4]) { if (!isset($MPEGaudioHeaderLengthCache[$head4])) { $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']]; $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']]; $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']]; $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding']; $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']]; $MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength( $LongMPEGbitrateLookup[$head4], $LongMPEGversionLookup[$head4], $LongMPEGlayerLookup[$head4], $LongMPEGpaddingLookup[$head4], $LongMPEGfrequencyLookup[$head4]); } if ($MPEGaudioHeaderLengthCache[$head4] > 4) { $WhereWeWere = $this->ftell(); $this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR); $next4 = $this->fread(4); if ($next4[0] == "\xFF") { if (!isset($MPEGaudioHeaderDecodeCache[$next4])) { $MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4); } if (!isset($MPEGaudioHeaderValidCache[$next4])) { $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false); } if ($MPEGaudioHeaderValidCache[$next4]) { $this->fseek(-4, SEEK_CUR); getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]); getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]); getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]); getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]); getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]); if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) { $pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']); $this->warning('too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.'); foreach ($Distribution as $key1 => $value1) { foreach ($value1 as $key2 => $value2) { $Distribution[$key1][$key2] = round($value2 / $pct_data_scanned); } } break; } continue; } } unset($next4); $this->fseek($WhereWeWere - 3); } } } foreach ($Distribution as $key => $value) { ksort($Distribution[$key], SORT_NUMERIC); } ksort($Distribution['version'], SORT_STRING); $info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate']; $info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency']; $info['mpeg']['audio']['layer_distribution'] = $Distribution['layer']; $info['mpeg']['audio']['version_distribution'] = $Distribution['version']; $info['mpeg']['audio']['padding_distribution'] = $Distribution['padding']; if (count($Distribution['version']) > 1) { $this->error('Corrupt file - more than one MPEG version detected'); } if (count($Distribution['layer']) > 1) { $this->error('Corrupt file - more than one MPEG layer detected'); } if (count($Distribution['frequency']) > 1) { $this->error('Corrupt file - more than one MPEG sample rate detected'); } $bittotal = 0; foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) { if ($bitratevalue != 'free') { $bittotal += ($bitratevalue * $bitratecount); } } $info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']); if ($info['mpeg']['audio']['frame_count'] == 0) { $this->error('no MPEG audio frames found'); return false; } $info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']); $info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr'); $info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true); $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; $info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true); $info['fileformat'] = $info['audio']['dataformat']; return true; } public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) { // looks for synch, decodes MPEG audio header $info = &$this->getid3->info; static $MPEGaudioVersionLookup; static $MPEGaudioLayerLookup; static $MPEGaudioBitrateLookup; if (empty($MPEGaudioVersionLookup)) { $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); } $this->fseek($avdataoffset); $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset); if ($sync_seek_buffer_size <= 0) { $this->error('Invalid $sync_seek_buffer_size at offset '.$avdataoffset); return false; } $header = $this->fread($sync_seek_buffer_size); $sync_seek_buffer_size = strlen($header); $SynchSeekOffset = 0; while ($SynchSeekOffset < $sync_seek_buffer_size) { if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) { if ($SynchSeekOffset > $sync_seek_buffer_size) { // if a synch's not found within the first 128k bytes, then give up $this->error('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB'); if (isset($info['audio']['bitrate'])) { unset($info['audio']['bitrate']); } if (isset($info['mpeg']['audio'])) { unset($info['mpeg']['audio']); } if (empty($info['mpeg'])) { unset($info['mpeg']); } return false; } elseif (feof($this->getid3->fp)) { $this->error('Could not find valid MPEG audio synch before end of file'); if (isset($info['audio']['bitrate'])) { unset($info['audio']['bitrate']); } if (isset($info['mpeg']['audio'])) { unset($info['mpeg']['audio']); } if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) { unset($info['mpeg']); } return false; } } if (($SynchSeekOffset + 1) >= strlen($header)) { $this->error('Could not find valid MPEG synch before end of file'); return false; } if (($header[$SynchSeekOffset] == "\xFF") && ($header[($SynchSeekOffset + 1)] > "\xE0")) { // synch detected if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) { $FirstFrameThisfileInfo = $info; $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset; if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) { // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below unset($FirstFrameThisfileInfo); } } $dummy = $info; // only overwrite real data if valid header found if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) { $info = $dummy; $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset; switch (isset($info['fileformat']) ? $info['fileformat'] : '') { case '': case 'id3': case 'ape': case 'mp3': $info['fileformat'] = 'mp3'; $info['audio']['dataformat'] = 'mp3'; break; } if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) { if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) { // If there is garbage data between a valid VBR header frame and a sequence // of valid MPEG-audio frames the VBR data is no longer discarded. $info = $FirstFrameThisfileInfo; $info['avdataoffset'] = $FirstFrameAVDataOffset; $info['fileformat'] = 'mp3'; $info['audio']['dataformat'] = 'mp3'; $dummy = $info; unset($dummy['mpeg']['audio']); $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength']; $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset; if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) { $info = $dummy; $info['avdataoffset'] = $GarbageOffsetEnd; $this->warning('apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd); } else { $this->warning('using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')'); } } } if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) { // VBR file with no VBR header $BitrateHistogram = true; } if ($BitrateHistogram) { $info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0); $info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0); if ($info['mpeg']['audio']['version'] == '1') { if ($info['mpeg']['audio']['layer'] == 3) { $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0); } elseif ($info['mpeg']['audio']['layer'] == 2) { $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0); } elseif ($info['mpeg']['audio']['layer'] == 1) { $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0); } } elseif ($info['mpeg']['audio']['layer'] == 1) { $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0); } else { $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0); } $dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); $synchstartoffset = $info['avdataoffset']; $this->fseek($info['avdataoffset']); // you can play with these numbers: $max_frames_scan = 50000; $max_scan_segments = 10; // don't play with these numbers: $FastMode = false; $SynchErrorsFound = 0; $frames_scanned = 0; $this_scan_segment = 0; $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments); $pct_data_scanned = 0; for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) { $frames_scanned_this_segment = 0; if ($this->ftell() >= $info['avdataend']) { break; } $scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments))); if ($current_segment > 0) { $this->fseek($scan_start_offset[$current_segment]); $buffer_4k = $this->fread(4096); for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) { if (($buffer_4k[$j] == "\xFF") && ($buffer_4k[($j + 1)] > "\xE0")) { // synch detected if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) { $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength']; if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) { $scan_start_offset[$current_segment] += $j; break; } } } } } $synchstartoffset = $scan_start_offset[$current_segment]; while ($this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) { $FastMode = true; $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']]; if (empty($dummy['mpeg']['audio']['framelength'])) { $SynchErrorsFound++; $synchstartoffset++; } else { getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]); getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]); getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]); $synchstartoffset += $dummy['mpeg']['audio']['framelength']; } $frames_scanned++; if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) { $this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']); if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) { // file likely contains < $max_frames_scan, just scan as one segment $max_scan_segments = 1; $frames_scan_per_segment = $max_frames_scan; } else { $pct_data_scanned += $this_pct_scanned; break; } } } } if ($pct_data_scanned > 0) { $this->warning('too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.'); foreach ($info['mpeg']['audio'] as $key1 => $value1) { if (!preg_match('#_distribution$#i', $key1)) { continue; } foreach ($value1 as $key2 => $value2) { $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned); } } } if ($SynchErrorsFound > 0) { $this->warning('Found '.$SynchErrorsFound.' synch errors in histogram analysis'); //return false; } $bittotal = 0; $framecounter = 0; foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) { $framecounter += $bitratecount; if ($bitratevalue != 'free') { $bittotal += ($bitratevalue * $bitratecount); } } if ($framecounter == 0) { $this->error('Corrupt MP3 file: framecounter == zero'); return false; } $info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter); $info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter); $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently $distinct_bitrates = 0; foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) { if ($bitrate_count > 0) { $distinct_bitrates++; } } if ($distinct_bitrates > 1) { $info['mpeg']['audio']['bitrate_mode'] = 'vbr'; } else { $info['mpeg']['audio']['bitrate_mode'] = 'cbr'; } $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; } break; // exit while() } } $SynchSeekOffset++; if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) { // end of file/data if (empty($info['mpeg']['audio'])) { $this->error('could not find valid MPEG synch before end of file'); if (isset($info['audio']['bitrate'])) { unset($info['audio']['bitrate']); } if (isset($info['mpeg']['audio'])) { unset($info['mpeg']['audio']); } if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) { unset($info['mpeg']); } return false; } break; } } $info['audio']['channels'] = $info['mpeg']['audio']['channels']; $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode']; $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; return true; } public static function MPEGaudioVersionArray() { static $MPEGaudioVersion = array('2.5', false, '2', '1'); return $MPEGaudioVersion; } public static function MPEGaudioLayerArray() { static $MPEGaudioLayer = array(false, 3, 2, 1); return $MPEGaudioLayer; } public static function MPEGaudioBitrateArray() { static $MPEGaudioBitrate; if (empty($MPEGaudioBitrate)) { $MPEGaudioBitrate = array ( '1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000), 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000), 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000) ), '2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000), 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000), ) ); $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2]; $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2']; } return $MPEGaudioBitrate; } public static function MPEGaudioFrequencyArray() { static $MPEGaudioFrequency; if (empty($MPEGaudioFrequency)) { $MPEGaudioFrequency = array ( '1' => array(44100, 48000, 32000), '2' => array(22050, 24000, 16000), '2.5' => array(11025, 12000, 8000) ); } return $MPEGaudioFrequency; } public static function MPEGaudioChannelModeArray() { static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono'); return $MPEGaudioChannelMode; } public static function MPEGaudioModeExtensionArray() { static $MPEGaudioModeExtension; if (empty($MPEGaudioModeExtension)) { $MPEGaudioModeExtension = array ( 1 => array('4-31', '8-31', '12-31', '16-31'), 2 => array('4-31', '8-31', '12-31', '16-31'), 3 => array('', 'IS', 'MS', 'IS+MS') ); } return $MPEGaudioModeExtension; } public static function MPEGaudioEmphasisArray() { static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17'); return $MPEGaudioEmphasis; } public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) { return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15); } public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) { if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) { return false; } static $MPEGaudioVersionLookup; static $MPEGaudioLayerLookup; static $MPEGaudioBitrateLookup; static $MPEGaudioFrequencyLookup; static $MPEGaudioChannelModeLookup; static $MPEGaudioModeExtensionLookup; static $MPEGaudioEmphasisLookup; if (empty($MPEGaudioVersionLookup)) { $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); } if (isset($MPEGaudioVersionLookup[$rawarray['version']])) { $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']]; } else { echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : ''); return false; } if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) { $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']]; } else { echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : ''); return false; } if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) { echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : ''); if ($rawarray['bitrate'] == 15) { // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0 // let it go through here otherwise file will not be identified if (!$allowBitrate15) { return false; } } else { return false; } } if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) { echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : ''); return false; } if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) { echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : ''); return false; } if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) { echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : ''); return false; } if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) { echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : ''); return false; } // These are just either set or not set, you can't mess that up :) // $rawarray['protection']; // $rawarray['padding']; // $rawarray['private']; // $rawarray['copyright']; // $rawarray['original']; return true; } public static function MPEGaudioHeaderDecode($Header4Bytes) { // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM // A - Frame sync (all bits set) // B - MPEG Audio version ID // C - Layer description // D - Protection bit // E - Bitrate index // F - Sampling rate frequency index // G - Padding bit // H - Private bit // I - Channel Mode // J - Mode extension (Only if Joint stereo) // K - Copyright // L - Original // M - Emphasis if (strlen($Header4Bytes) != 4) { return false; } $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4; $MPEGrawHeader['version'] = (ord($Header4Bytes[1]) & 0x18) >> 3; // BB $MPEGrawHeader['layer'] = (ord($Header4Bytes[1]) & 0x06) >> 1; // CC $MPEGrawHeader['protection'] = (ord($Header4Bytes[1]) & 0x01); // D $MPEGrawHeader['bitrate'] = (ord($Header4Bytes[2]) & 0xF0) >> 4; // EEEE $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes[2]) & 0x0C) >> 2; // FF $MPEGrawHeader['padding'] = (ord($Header4Bytes[2]) & 0x02) >> 1; // G $MPEGrawHeader['private'] = (ord($Header4Bytes[2]) & 0x01); // H $MPEGrawHeader['channelmode'] = (ord($Header4Bytes[3]) & 0xC0) >> 6; // II $MPEGrawHeader['modeextension'] = (ord($Header4Bytes[3]) & 0x30) >> 4; // JJ $MPEGrawHeader['copyright'] = (ord($Header4Bytes[3]) & 0x08) >> 3; // K $MPEGrawHeader['original'] = (ord($Header4Bytes[3]) & 0x04) >> 2; // L $MPEGrawHeader['emphasis'] = (ord($Header4Bytes[3]) & 0x03); // MM return $MPEGrawHeader; } public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) { static $AudioFrameLengthCache = array(); if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) { $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false; if ($bitrate != 'free') { if ($version == '1') { if ($layer == '1') { // For Layer I slot is 32 bits long $FrameLengthCoefficient = 48; $SlotLength = 4; } else { // Layer 2 / 3 // for Layer 2 and Layer 3 slot is 8 bits long. $FrameLengthCoefficient = 144; $SlotLength = 1; } } else { // MPEG-2 / MPEG-2.5 if ($layer == '1') { // For Layer I slot is 32 bits long $FrameLengthCoefficient = 24; $SlotLength = 4; } elseif ($layer == '2') { // for Layer 2 and Layer 3 slot is 8 bits long. $FrameLengthCoefficient = 144; $SlotLength = 1; } else { // layer 3 // for Layer 2 and Layer 3 slot is 8 bits long. $FrameLengthCoefficient = 72; $SlotLength = 1; } } // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding if ($samplerate > 0) { $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate; $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I) if ($padding) { $NewFramelength += $SlotLength; } $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength; } } } return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate]; } public static function ClosestStandardMP3Bitrate($bit_rate) { static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000); static $bit_rate_table = array (0=>'-'); $round_bit_rate = intval(round($bit_rate, -3)); if (!isset($bit_rate_table[$round_bit_rate])) { if ($round_bit_rate > max($standard_bit_rates)) { $bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate)); } else { $bit_rate_table[$round_bit_rate] = max($standard_bit_rates); foreach ($standard_bit_rates as $standard_bit_rate) { if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) { break; } $bit_rate_table[$round_bit_rate] = $standard_bit_rate; } } } return $bit_rate_table[$round_bit_rate]; } public static function XingVBRidOffset($version, $channelmode) { static $XingVBRidOffsetCache = array(); if (empty($XingVBRidOffset)) { $XingVBRidOffset = array ( '1' => array ('mono' => 0x15, // 4 + 17 = 21 'stereo' => 0x24, // 4 + 32 = 36 'joint stereo' => 0x24, 'dual channel' => 0x24 ), '2' => array ('mono' => 0x0D, // 4 + 9 = 13 'stereo' => 0x15, // 4 + 17 = 21 'joint stereo' => 0x15, 'dual channel' => 0x15 ), '2.5' => array ('mono' => 0x15, 'stereo' => 0x15, 'joint stereo' => 0x15, 'dual channel' => 0x15 ) ); } return $XingVBRidOffset[$version][$channelmode]; } public static function LAMEvbrMethodLookup($VBRmethodID) { static $LAMEvbrMethodLookup = array( 0x00 => 'unknown', 0x01 => 'cbr', 0x02 => 'abr', 0x03 => 'vbr-old / vbr-rh', 0x04 => 'vbr-new / vbr-mtrh', 0x05 => 'vbr-mt', 0x06 => 'vbr (full vbr method 4)', 0x08 => 'cbr (constant bitrate 2 pass)', 0x09 => 'abr (2 pass)', 0x0F => 'reserved' ); return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : ''); } public static function LAMEmiscStereoModeLookup($StereoModeID) { static $LAMEmiscStereoModeLookup = array( 0 => 'mono', 1 => 'stereo', 2 => 'dual mono', 3 => 'joint stereo', 4 => 'forced stereo', 5 => 'auto', 6 => 'intensity stereo', 7 => 'other' ); return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : ''); } public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) { static $LAMEmiscSourceSampleFrequencyLookup = array( 0 => '<= 32 kHz', 1 => '44.1 kHz', 2 => '48 kHz', 3 => '> 48kHz' ); return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : ''); } public static function LAMEsurroundInfoLookup($SurroundInfoID) { static $LAMEsurroundInfoLookup = array( 0 => 'no surround info', 1 => 'DPL encoding', 2 => 'DPL2 encoding', 3 => 'Ambisonic encoding' ); return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved'); } public static function LAMEpresetUsedLookup($LAMEtag) { if ($LAMEtag['preset_used_id'] == 0) { // no preset used (LAME >=3.93) // no preset recorded (LAME <3.93) return ''; } $LAMEpresetUsedLookup = array(); ///// THIS PART CANNOT BE STATIC . for ($i = 8; $i <= 320; $i++) { switch ($LAMEtag['vbr_method']) { case 'cbr': $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i; break; case 'abr': default: // other VBR modes shouldn't be here(?) $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i; break; } } // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions() // named alt-presets $LAMEpresetUsedLookup[1000] = '--r3mix'; $LAMEpresetUsedLookup[1001] = '--alt-preset standard'; $LAMEpresetUsedLookup[1002] = '--alt-preset extreme'; $LAMEpresetUsedLookup[1003] = '--alt-preset insane'; $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard'; $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme'; $LAMEpresetUsedLookup[1006] = '--alt-preset medium'; $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium'; // LAME 3.94 additions/changes $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003 $LAMEpresetUsedLookup[410] = '-V9'; $LAMEpresetUsedLookup[420] = '-V8'; $LAMEpresetUsedLookup[440] = '-V6'; $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003 $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003 $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003 $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003 $LAMEpresetUsedLookup[490] = '-V1'; $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org'); } }
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