diff options
Diffstat (limited to 'getid3/module.audio.mp3.php')
| -rw-r--r-- | getid3/module.audio.mp3.php | 2022 |
1 files changed, 2022 insertions, 0 deletions
diff --git a/getid3/module.audio.mp3.php b/getid3/module.audio.mp3.php new file mode 100644 index 0000000..ac9a273 --- /dev/null +++ b/getid3/module.audio.mp3.php @@ -0,0 +1,2022 @@ +<?php +///////////////////////////////////////////////////////////////// +/// getID3() by James Heinrich <info@getid3.org> // +// available at http://getid3.sourceforge.net // +// or http://www.getid3.org // +///////////////////////////////////////////////////////////////// +// See readme.txt for more details // +///////////////////////////////////////////////////////////////// +// // +// module.audio.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 +{ + + var $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files + + function getid3_mp3(&$fd, &$ThisFileInfo) { + + if (!$this->getOnlyMPEGaudioInfo($fd, $ThisFileInfo, $ThisFileInfo['avdataoffset'])) { + if ($this->allow_bruteforce) { + $ThisFileInfo['error'][] = 'Rescanning file in BruteForce mode'; + $this->getOnlyMPEGaudioInfoBruteForce($fd, $ThisFileInfo); + } + } + + + if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode'])) { + $ThisFileInfo['audio']['bitrate_mode'] = strtolower($ThisFileInfo['mpeg']['audio']['bitrate_mode']); + } + + if (((isset($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] > $ThisFileInfo['id3v2']['headerlength'])) || (!isset($ThisFileInfo['id3v2']) && ($ThisFileInfo['avdataoffset'] > 0)))) { + + $synchoffsetwarning = 'Unknown data before synch '; + if (isset($ThisFileInfo['id3v2']['headerlength'])) { + $synchoffsetwarning .= '(ID3v2 header ends at '.$ThisFileInfo['id3v2']['headerlength'].', then '.($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']).' bytes garbage, '; + } else { + $synchoffsetwarning .= '(should be at beginning of file, '; + } + $synchoffsetwarning .= 'synch detected at '.$ThisFileInfo['avdataoffset'].')'; + if (@$ThisFileInfo['audio']['bitrate_mode'] == 'cbr') { + + if (!empty($ThisFileInfo['id3v2']['headerlength']) && (($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']) == $ThisFileInfo['mpeg']['audio']['framelength'])) { + + $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.'; + $ThisFileInfo['audio']['codec'] = 'LAME'; + $CurrentDataLAMEversionString = 'LAME3.'; + + } elseif (empty($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] == $ThisFileInfo['mpeg']['audio']['framelength'])) { + + $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.'; + $ThisFileInfo['audio']['codec'] = 'LAME'; + $CurrentDataLAMEversionString = 'LAME3.'; + + } + + } + $ThisFileInfo['warning'][] = $synchoffsetwarning; + + } + + if (isset($ThisFileInfo['mpeg']['audio']['LAME'])) { + $ThisFileInfo['audio']['codec'] = 'LAME'; + if (!empty($ThisFileInfo['mpeg']['audio']['LAME']['long_version'])) { + $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['long_version'], "\x00"); + } elseif (!empty($ThisFileInfo['mpeg']['audio']['LAME']['short_version'])) { + $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['short_version'], "\x00"); + } + } + + $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : @$ThisFileInfo['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 = $ThisFileInfo['avdataend'] - $PossiblyLongerLAMEversion_FrameLength; + fseek($fd, $PossibleLAMEversionStringOffset); + $PossiblyLongerLAMEversion_Data = fread($fd, $PossiblyLongerLAMEversion_FrameLength); + switch (substr($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($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)" + if (strlen($PossiblyLongerLAMEversion_NewString) > strlen(@$ThisFileInfo['audio']['encoder'])) { + $ThisFileInfo['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString; + } + } + } + } + if (!empty($ThisFileInfo['audio']['encoder'])) { + $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['audio']['encoder'], "\x00 "); + } + + switch (@$ThisFileInfo['mpeg']['audio']['layer']) { + case 1: + case 2: + $ThisFileInfo['audio']['dataformat'] = 'mp'.$ThisFileInfo['mpeg']['audio']['layer']; + break; + } + if (@$ThisFileInfo['fileformat'] == 'mp3') { + switch ($ThisFileInfo['audio']['dataformat']) { + case 'mp1': + case 'mp2': + case 'mp3': + $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat']; + break; + + default: + $ThisFileInfo['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$ThisFileInfo['audio']['dataformat'].'"'; + break; + } + } + + if (empty($ThisFileInfo['fileformat'])) { + unset($ThisFileInfo['fileformat']); + unset($ThisFileInfo['audio']['bitrate_mode']); + unset($ThisFileInfo['avdataoffset']); + unset($ThisFileInfo['avdataend']); + return false; + } + + $ThisFileInfo['mime_type'] = 'audio/mpeg'; + $ThisFileInfo['audio']['lossless'] = false; + + // Calculate playtime + if (!isset($ThisFileInfo['playtime_seconds']) && isset($ThisFileInfo['audio']['bitrate']) && ($ThisFileInfo['audio']['bitrate'] > 0)) { + $ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['audio']['bitrate']; + } + + $ThisFileInfo['audio']['encoder_options'] = $this->GuessEncoderOptions($ThisFileInfo); + + return true; + } + + + function GuessEncoderOptions(&$ThisFileInfo) { + // shortcuts + if (!empty($ThisFileInfo['mpeg']['audio'])) { + $thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio']; + if (!empty($thisfile_mpeg_audio['LAME'])) { + $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; + } + } + + $encoder_options = ''; + static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256); + + if ((@$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']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; + + } elseif ($ThisFileInfo['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'.$LAME_q_value; + + } elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') { + + $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000); + + } else { + + $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']); + + } + + } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { + + $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr']; + + } elseif (!empty($ThisFileInfo['audio']['bitrate'])) { + + if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') { + $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000); + } else { + $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']); + } + + } + if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { + $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min']; + } + + if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$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($encoder_options) && !empty($ThisFileInfo['audio']['bitrate']) && !empty($ThisFileInfo['audio']['bitrate_mode'])) { + //$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000); + $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']); + } + + return $encoder_options; + } + + + function decodeMPEGaudioHeader($fd, $offset, &$ThisFileInfo, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) { + + static $MPEGaudioVersionLookup; + static $MPEGaudioLayerLookup; + static $MPEGaudioBitrateLookup; + static $MPEGaudioFrequencyLookup; + static $MPEGaudioChannelModeLookup; + static $MPEGaudioModeExtensionLookup; + static $MPEGaudioEmphasisLookup; + if (empty($MPEGaudioVersionLookup)) { + $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray(); + $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray(); + $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray(); + $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray(); + $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray(); + $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray(); + $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray(); + } + + if ($offset >= $ThisFileInfo['avdataend']) { + $ThisFileInfo['error'][] = 'end of file encounter looking for MPEG synch'; + return false; + } + fseek($fd, $offset, SEEK_SET); + //$headerstring = fread($fd, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame + $headerstring = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data + + // MP3 audio frame structure: + // $aa $aa $aa $aa [$bb $bb] $cc... + // where $aa..$aa is the four-byte mpeg-audio header (below) + // $bb $bb is the optional 2-byte CRC + // and $cc... is the audio data + + $head4 = substr($headerstring, 0, 4); + + static $MPEGaudioHeaderDecodeCache = array(); + if (isset($MPEGaudioHeaderDecodeCache[$head4])) { + $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4]; + } else { + $MPEGheaderRawArray = getid3_mp3::MPEGaudioHeaderDecode($head4); + $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray; + } + + static $MPEGaudioHeaderValidCache = array(); + + // Not in cache + if (!isset($MPEGaudioHeaderValidCache[$head4])) { + //$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1) + $MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false); + } + + // shortcut + if (!isset($ThisFileInfo['mpeg']['audio'])) { + $ThisFileInfo['mpeg']['audio'] = array(); + } + $thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio']; + + + if ($MPEGaudioHeaderValidCache[$head4]) { + $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray; + } else { + $ThisFileInfo['error'][] = 'Invalid MPEG audio header at offset '.$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']]; + + $ThisFileInfo['audio']['channels'] = $thisfile_mpeg_audio['channels']; + $ThisFileInfo['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 + $ThisFileInfo['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 == $ThisFileInfo['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')) { + + $ThisFileInfo['audio']['dataformat'] = 'mp2'; + switch ($thisfile_mpeg_audio['channelmode']) { + + case 'mono': + if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { + // these are ok + } else { + $ThisFileInfo['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 { + $ThisFileInfo['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'; + return false; + } + break; + + } + + } + + + if ($ThisFileInfo['audio']['sample_rate'] > 0) { + $thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $ThisFileInfo['audio']['sample_rate']); + } + + $nextframetestoffset = $offset + 1; + if ($thisfile_mpeg_audio['bitrate'] != 'free') { + + $ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; + + if (isset($thisfile_mpeg_audio['framelength'])) { + $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength']; + } else { + $ThisFileInfo['error'][] = 'Frame at offset('.$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'; + $ThisFileInfo['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 + + $VBRidOffset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); + $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4); + + if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) { + // 'Xing' is traditional Xing VBR frame + // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) + // 'Info' *can* legally be used to specify a VBR file as well, however. + + // http://www.multiweb.cz/twoinches/MP3inside.htm + //00..03 = "Xing" or "Info" + //04..07 = Flags: + // 0x01 Frames Flag set if value for number of frames in file is stored + // 0x02 Bytes Flag set if value for filesize in bytes is stored + // 0x04 TOC Flag set if values for TOC are stored + // 0x08 VBR Scale Flag set if values for VBR scale is stored + //08..11 Frames: Number of frames in file (including the first Xing/Info one) + //12..15 Bytes: File length in Bytes + //16..115 TOC (Table of Contents): + // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. + // Each Byte has a value according this formula: + // (TOC[i] / 256) * fileLenInBytes + // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use: + // TOC[(60/240)*100] = TOC[25] + // and corresponding Byte in file is then approximately at: + // (TOC[25]/256) * 5000000 + //116..119 VBR Scale + + + // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME +// if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') { + $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; + $thisfile_mpeg_audio['VBR_method'] = 'Xing'; +// } else { +// $ScanAsCBR = true; +// $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; +// } + + $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4)); + + $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); + $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); + $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); + $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); + + if ($thisfile_mpeg_audio['xing_flags']['frames']) { + $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4)); + //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame + } + if ($thisfile_mpeg_audio['xing_flags']['bytes']) { + $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4)); + } + + //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { + if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { + + $framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']; + + if ($thisfile_mpeg_audio['layer'] == '1') { + // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 + //$ThisFileInfo['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; + $ThisFileInfo['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 12; + } else { + // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 + //$ThisFileInfo['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; + $ThisFileInfo['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['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; + $thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($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'])) { + $ThisFileInfo['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; + } + $ThisFileInfo['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator']; + $ThisFileInfo['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'])) { + $ThisFileInfo['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; + } + $ThisFileInfo['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator']; + $ThisFileInfo['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']; + $thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); + $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality']; + $thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($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); + $thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); + $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); + $thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); + if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { + $ThisFileInfo['warning'][] = 'Unknown LAME preset used ('.$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'; + $thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); + $ThisFileInfo['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) { + $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; + if (getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, true)) { + $recursivesearch = false; + $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; + } + if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { + $ThisFileInfo['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'; + } + } + + } + + } + + if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']))) { + if ($ExpectedNumberOfAudioBytes > ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) { + if (@$ThisFileInfo['fileformat'] == 'riff') { + // ignore, audio data is broken into chunks so will always be data "missing" + } elseif (($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) == 1) { + $ThisFileInfo['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'; + } else { + $ThisFileInfo['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])).' bytes)'; + } + } else { + if ((($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) { + // $prenullbytefileoffset = ftell($fd); + // fseek($fd, $ThisFileInfo['avdataend'], SEEK_SET); + // $PossibleNullByte = fread($fd, 1); + // fseek($fd, $prenullbytefileoffset, SEEK_SET); + // if ($PossibleNullByte === "\x00") { + $ThisFileInfo['avdataend']--; + // $ThisFileInfo['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored'; + // } else { + // $ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'; + // } + } else { + $ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'; + } + } + } + + if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($ThisFileInfo['audio']['bitrate'])) { + if (($offset == $ThisFileInfo['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { + $framebytelength = getid3_mp3::FreeFormatFrameLength($fd, $offset, $ThisFileInfo, true); + if ($framebytelength > 0) { + $thisfile_mpeg_audio['framelength'] = $framebytelength; + if ($thisfile_mpeg_audio['layer'] == '1') { + // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 + $ThisFileInfo['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; + } else { + // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 + $ThisFileInfo['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; + } + } else { + $ThisFileInfo['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header'; + } + } + } + + if (@$thisfile_mpeg_audio['VBR_frames']) { + switch ($thisfile_mpeg_audio['bitrate_mode']) { + case 'vbr': + case 'abr': + if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) { + $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 384); + } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) { + $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 576); + } else { + $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 1152); + } + if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { + $ThisFileInfo['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 (!getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $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 < $ThisFileInfo['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 < $ThisFileInfo['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); + // $SideInfoOffset += 1; + // } + // } + //} + + return true; + } + + function RecursiveFrameScanning(&$fd, &$ThisFileInfo, &$offset, &$nextframetestoffset, $ScanAsCBR) { + for ($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) >= $ThisFileInfo['avdataend']) { + // end of file + return true; + } + + $nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']); + if (getid3_mp3::decodeMPEGaudioHeader($fd, $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($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($ThisFileInfo['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $ThisFileInfo['mpeg']['audio']['bitrate'])) { + return false; + } + } + + + // next frame is OK, get ready to check the one after that + if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) { + $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength']; + } else { + $ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.'; + return false; + } + + } else { + + // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence + $ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.'; + + return false; + } + } + return true; + } + + function FreeFormatFrameLength($fd, $offset, &$ThisFileInfo, $deepscan=false) { + fseek($fd, $offset, SEEK_SET); + $MPEGaudioData = fread($fd, 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) { + $ThisFileInfo['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset; + return false; + } else { + $ThisFileInfo['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'; + $ThisFileInfo['audio']['codec'] = 'LAME'; + $ThisFileInfo['audio']['encoder'] = 'LAME3.88'; + $SyncPattern1 = substr($SyncPattern1, 0, 3); + $SyncPattern2 = substr($SyncPattern2, 0, 3); + } + } + + if ($deepscan) { + + $ActualFrameLengthValues = array(); + $nextoffset = $offset + $framelength; + while ($nextoffset < ($ThisFileInfo['avdataend'] - 6)) { + fseek($fd, $nextoffset - 1, SEEK_SET); + $NextSyncPattern = fread($fd, 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 { + $ThisFileInfo['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset; + return false; + } + $nextoffset += $framelength; + } + if (count($ActualFrameLengthValues) > 0) { + $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues))); + } + } + return $framelength; + } + + function getOnlyMPEGaudioInfoBruteForce($fd, &$ThisFileInfo) { + + $MPEGaudioHeaderDecodeCache = array(); + $MPEGaudioHeaderValidCache = array(); + $MPEGaudioHeaderLengthCache = array(); + $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray(); + $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray(); + $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray(); + $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray(); + $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray(); + $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray(); + $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray(); + $LongMPEGversionLookup = array(); + $LongMPEGlayerLookup = array(); + $LongMPEGbitrateLookup = array(); + $LongMPEGpaddingLookup = array(); + $LongMPEGfrequencyLookup = array(); + + $Distribution['bitrate'] = array(); + $Distribution['frequency'] = array(); + $Distribution['layer'] = array(); + $Distribution['version'] = array(); + $Distribution['padding'] = array(); + + fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); + + $max_frames_scan = 5000; + $frames_scanned = 0; + + $previousvalidframe = $ThisFileInfo['avdataoffset']; + while (ftell($fd) < $ThisFileInfo['avdataend']) { + set_time_limit(30); + $head4 = fread($fd, 4); + if (strlen($head4) < 4) { + break; + } + if ($head4{0} != "\xFF") { + for ($i = 1; $i < 4; $i++) { + if ($head4{$i} == "\xFF") { + fseek($fd, $i - 4, SEEK_CUR); + continue 2; + } + } + continue; + } + if (!isset($MPEGaudioHeaderDecodeCache[$head4])) { + $MPEGaudioHeaderDecodeCache[$head4] = getid3_mp3::MPEGaudioHeaderDecode($head4); + } + if (!isset($MPEGaudioHeaderValidCache[$head4])) { + $MPEGaudioHeaderValidCache[$head4] = getid3_mp3::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] = getid3_mp3::MPEGaudioFrameLength( + $LongMPEGbitrateLookup[$head4], + $LongMPEGversionLookup[$head4], + $LongMPEGlayerLookup[$head4], + $LongMPEGpaddingLookup[$head4], + $LongMPEGfrequencyLookup[$head4]); + } + if ($MPEGaudioHeaderLengthCache[$head4] > 4) { + $WhereWeWere = ftell($fd); + fseek($fd, $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR); + $next4 = fread($fd, 4); + if ($next4{0} == "\xFF") { + if (!isset($MPEGaudioHeaderDecodeCache[$next4])) { + $MPEGaudioHeaderDecodeCache[$next4] = getid3_mp3::MPEGaudioHeaderDecode($next4); + } + if (!isset($MPEGaudioHeaderValidCache[$next4])) { + $MPEGaudioHeaderValidCache[$next4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false); + } + if ($MPEGaudioHeaderValidCache[$next4]) { + fseek($fd, -4, SEEK_CUR); + + @$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]++; + @$Distribution['layer'][$LongMPEGlayerLookup[$head4]]++; + @$Distribution['version'][$LongMPEGversionLookup[$head4]]++; + @$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]++; + @$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]++; + if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) { + $pct_data_scanned = (ftell($fd) - $ThisFileInfo['avdataoffset']) / ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']); + $ThisFileInfo['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.'; + foreach ($Distribution as $key1 => $value1) { + foreach ($value1 as $key2 => $value2) { + $Distribution[$key1][$key2] = round($value2 / $pct_data_scanned); + } + } + break; + } + continue; + } + } + unset($next4); + fseek($fd, $WhereWeWere - 3, SEEK_SET); + } + + } + } + foreach ($Distribution as $key => $value) { + ksort($Distribution[$key], SORT_NUMERIC); + } + ksort($Distribution['version'], SORT_STRING); + $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate']; + $ThisFileInfo['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency']; + $ThisFileInfo['mpeg']['audio']['layer_distribution'] = $Distribution['layer']; + $ThisFileInfo['mpeg']['audio']['version_distribution'] = $Distribution['version']; + $ThisFileInfo['mpeg']['audio']['padding_distribution'] = $Distribution['padding']; + if (count($Distribution['version']) > 1) { + $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG version detected'; + } + if (count($Distribution['layer']) > 1) { + $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG layer detected'; + } + if (count($Distribution['frequency']) > 1) { + $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG sample rate detected'; + } + + + $bittotal = 0; + foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) { + if ($bitratevalue != 'free') { + $bittotal += ($bitratevalue * $bitratecount); + } + } + $ThisFileInfo['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']); + if ($ThisFileInfo['mpeg']['audio']['frame_count'] == 0) { + $ThisFileInfo['error'][] = 'no MPEG audio frames found'; + return false; + } + $ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $ThisFileInfo['mpeg']['audio']['frame_count']); + $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr'); + $ThisFileInfo['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true); + + $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate']; + $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode']; + $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate']; + $ThisFileInfo['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true); + $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat']; + + return true; + } + + + function getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram=false) { + + // looks for synch, decodes MPEG audio header + + static $MPEGaudioVersionLookup; + static $MPEGaudioLayerLookup; + static $MPEGaudioBitrateLookup; + if (empty($MPEGaudioVersionLookup)) { + $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray(); + $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray(); + $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray(); + + } + + fseek($fd, $avdataoffset, SEEK_SET); + $sync_seek_buffer_size = min(128 * 1024, $ThisFileInfo['avdataend'] - $avdataoffset); + if ($sync_seek_buffer_size <= 0) { + $ThisFileInfo['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset; + return false; + } + $header = fread($fd, $sync_seek_buffer_size); + $sync_seek_buffer_size = strlen($header); + $SynchSeekOffset = 0; + while ($SynchSeekOffset < $sync_seek_buffer_size) { + + if ((($avdataoffset + $SynchSeekOffset) < $ThisFileInfo['avdataend']) && !feof($fd)) { + + if ($SynchSeekOffset > $sync_seek_buffer_size) { + // if a synch's not found within the first 128k bytes, then give up + $ThisFileInfo['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB'; + if (isset($ThisFileInfo['audio']['bitrate'])) { + unset($ThisFileInfo['audio']['bitrate']); + } + if (isset($ThisFileInfo['mpeg']['audio'])) { + unset($ThisFileInfo['mpeg']['audio']); + } + if (empty($ThisFileInfo['mpeg'])) { + unset($ThisFileInfo['mpeg']); + } + return false; + + } elseif (feof($fd)) { + + $ThisFileInfo['error'][] = 'Could not find valid MPEG audio synch before end of file'; + if (isset($ThisFileInfo['audio']['bitrate'])) { + unset($ThisFileInfo['audio']['bitrate']); + } + if (isset($ThisFileInfo['mpeg']['audio'])) { + unset($ThisFileInfo['mpeg']['audio']); + } + if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || (count($ThisFileInfo['mpeg']) == 0))) { + unset($ThisFileInfo['mpeg']); + } + return false; + } + } + + if (($SynchSeekOffset + 1) >= strlen($header)) { + $ThisFileInfo['error'][] = 'Could not find valid MPEG synch before end of file'; + return false; + } + + if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected + + if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) { + $FirstFrameThisfileInfo = $ThisFileInfo; + $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset; + if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) { + // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's + // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below + unset($FirstFrameThisfileInfo); + } + } + + $dummy = $ThisFileInfo; // only overwrite real data if valid header found + if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) { + $ThisFileInfo = $dummy; + $ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset; + switch (@$ThisFileInfo['fileformat']) { + case '': + case 'id3': + case 'ape': + case 'mp3': + $ThisFileInfo['fileformat'] = 'mp3'; + $ThisFileInfo['audio']['dataformat'] = 'mp3'; + break; + } + if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) { + if (!(abs($ThisFileInfo['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. + $ThisFileInfo = $FirstFrameThisfileInfo; + $ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset; + $ThisFileInfo['fileformat'] = 'mp3'; + $ThisFileInfo['audio']['dataformat'] = 'mp3'; + $dummy = $ThisFileInfo; + unset($dummy['mpeg']['audio']); + $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength']; + $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset; + if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) { + + $ThisFileInfo = $dummy; + $ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd; + $ThisFileInfo['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd; + + } else { + + $ThisFileInfo['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')'; + + } + } + } + if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && ($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) { + // VBR file with no VBR header + $BitrateHistogram = true; + } + + if ($BitrateHistogram) { + + $ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0); + $ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0); + + if ($ThisFileInfo['mpeg']['audio']['version'] == '1') { + if ($ThisFileInfo['mpeg']['audio']['layer'] == 3) { + $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0); + } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 2) { + $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0); + } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) { + $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0); + } + } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) { + $ThisFileInfo['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 { + $ThisFileInfo['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); + } + + $dummy = array('error'=>$ThisFileInfo['error'], 'warning'=>$ThisFileInfo['warning'], 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']); + $synchstartoffset = $ThisFileInfo['avdataoffset']; + fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); + + // you can play with these numbers: + $max_frames_scan = 50000; + $max_scan_segments = 10; + + // don't play with these numbers: + $FastMode = false; + $SynchErrorsFound = 0; + $frames_scanned = 0; + $this_scan_segment = 0; + $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments); + $pct_data_scanned = 0; + for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) { +//echo 'was at '.ftell($fd).'<br>'; + $frames_scanned_this_segment = 0; + if (ftell($fd) >= $ThisFileInfo['avdataend']) { +//echo 'breaking because current position ('.ftell($fd).') is >= $ThisFileInfo[avdataend] ('.$ThisFileInfo['avdataend'].')<br>'; + break; + } + $scan_start_offset[$current_segment] = max(ftell($fd), $ThisFileInfo['avdataoffset'] + round($current_segment * (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $max_scan_segments))); +//echo 'start at '.$scan_start_offset[$current_segment].'<br>'; + if ($current_segment > 0) { + fseek($fd, $scan_start_offset[$current_segment], SEEK_SET); + $buffer_4k = fread($fd, 4096); + for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) { + if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected + if (getid3_mp3::decodeMPEGaudioHeader($fd, $scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) { + $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength']; + if (getid3_mp3::decodeMPEGaudioHeader($fd, $calculated_next_offset, $dummy, false, false, $FastMode)) { + $scan_start_offset[$current_segment] += $j; + break; + } else { +//echo 'header['.__LINE__.'] at '.($calculated_next_offset).' invalid<br>'; + } + } else { +//echo 'header['.__LINE__.'] at '.($scan_start_offset[$current_segment] + $j).' invalid<br>'; + } + } + } + } +//echo 'actually start at '.$scan_start_offset[$current_segment].'<br>'; + $synchstartoffset = $scan_start_offset[$current_segment]; + while (getid3_mp3::decodeMPEGaudioHeader($fd, $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++; + $synchstartoffset++; +//echo ' [Ø] '; + } else { +//echo ' . '; + @$ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++; + @$ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++; + @$ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++; + + $synchstartoffset += $dummy['mpeg']['audio']['framelength']; + } + $frames_scanned++; + if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) { + $this_pct_scanned = (ftell($fd) - $scan_start_offset[$current_segment]) / ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']); + if (($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 += $this_pct_scanned; +//var_dump($pct_data_scanned); +//exit; + break; + } + } + } +//echo '<hr>'; + } + if ($pct_data_scanned > 0) { + $ThisFileInfo['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$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 ($ThisFileInfo['mpeg']['audio'] as $key1 => $value1) { + if (!eregi('_distribution$', $key1)) { + continue; + } + foreach ($value1 as $key2 => $value2) { + $ThisFileInfo['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned); + } + } + } + + if ($SynchErrorsFound > 0) { + $ThisFileInfo['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis'; + //return false; + } + + $bittotal = 0; + $framecounter = 0; + foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) { + $framecounter += $bitratecount; + if ($bitratevalue != 'free') { + $bittotal += ($bitratevalue * $bitratecount); + } + } + if ($framecounter == 0) { + $ThisFileInfo['error'][] = 'Corrupt MP3 file: framecounter == zero'; + return false; + } + $ThisFileInfo['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter); + $ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter); + + $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate']; + + + // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently + $distinct_bitrates = 0; + foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) { + if ($bitrate_count > 0) { + $distinct_bitrates++; + } + } + if ($distinct_bitrates > 1) { + $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr'; + } else { + $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr'; + } + $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode']; + + } + + break; // exit while() + } + } + + $SynchSeekOffset++; + if (($avdataoffset + $SynchSeekOffset) >= $ThisFileInfo['avdataend']) { + // end of file/data + + if (empty($ThisFileInfo['mpeg']['audio'])) { + + $ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file'; + if (isset($ThisFileInfo['audio']['bitrate'])) { + unset($ThisFileInfo['audio']['bitrate']); + } + if (isset($ThisFileInfo['mpeg']['audio'])) { + unset($ThisFileInfo['mpeg']['audio']); + } + if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || empty($ThisFileInfo['mpeg']))) { + unset($ThisFileInfo['mpeg']); + } + return false; + + } + break; + } + + } + $ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels']; + $ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode']; + $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate']; + return true; + } + + + function MPEGaudioVersionArray() { + static $MPEGaudioVersion = array('2.5', false, '2', '1'); + return $MPEGaudioVersion; + } + + function MPEGaudioLayerArray() { + static $MPEGaudioLayer = array(false, 3, 2, 1); + return $MPEGaudioLayer; + } + + 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; + } + + 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; + } + + function MPEGaudioChannelModeArray() { + static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono'); + return $MPEGaudioChannelMode; + } + + 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; + } + + function MPEGaudioEmphasisArray() { + static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17'); + return $MPEGaudioEmphasis; + } + + function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) { + return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allowBitrate15); + } + + function MPEGaudioHeaderValid($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 = getid3_mp3::MPEGaudioVersionArray(); + $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray(); + $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray(); + $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray(); + $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray(); + $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray(); + $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray(); + } + + if (isset($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']; + // $rawarray['original']; + + return true; + } + + function MPEGaudioHeaderDecode($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 $MPEGrawHeader; + } + + function MPEGaudioFrameLength(&$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]; + } + + function ClosestStandardMP3Bitrate($bitrate) { + static $StandardBitrates = array(320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000); + static $BitrateTable = array(0=>'-'); + $roundbitrate = intval(round($bitrate, -3)); + if (!isset($BitrateTable[$roundbitrate])) { + if ($roundbitrate > 320000) { + $BitrateTable[$roundbitrate] = round($bitrate, -4); + } else { + $LastBitrate = 320000; + foreach ($StandardBitrates as $StandardBitrate) { + $BitrateTable[$roundbitrate] = $StandardBitrate; + if ($roundbitrate >= $StandardBitrate - (($LastBitrate - $StandardBitrate) / 2)) { + break; + } + $LastBitrate = $StandardBitrate; + } + } + } + return $BitrateTable[$roundbitrate]; + } + + 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][$channelmode]; + } + + function LAMEvbrMethodLookup($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] : ''); + } + + 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] : ''); + } + + function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) { + static $LAMEmiscSourceSampleFrequencyLookup = array( + 0 => '<= 32 kHz', + 1 => '44.1 kHz', + 2 => '48 kHz', + 3 => '> 48kHz' + ); + return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : ''); + } + + 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'); + } + + 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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