| // | Allan Hansen | // +----------------------------------------------------------------------+ // | module.audio.mp3.php | // | Module for analyzing MPEG Audio Layer 1,2,3 files. | // | dependencies: none | // +----------------------------------------------------------------------+ // // $Id: module.audio.mp3.php 3318 2009-05-20 21:54:10Z vdigital $ class getid3_mp3 extends getid3_handler { // 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 const VALID_CHECK_FRAMES = 35; public function Analyze() { $this->getAllMPEGInfo($this->getid3->fp, $this->getid3->info); return true; } public function AnalyzeMPEGaudioInfo() { $this->getOnlyMPEGaudioInfo($this->getid3->fp, $this->getid3->info, $this->getid3->info['avdataoffset'], false); } public function getAllMPEGInfo(&$fd, &$info) { $this->getOnlyMPEGaudioInfo($fd, $info, 0 + $info['avdataoffset']); if (isset($info['mpeg']['audio']['bitrate_mode'])) { $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']); } if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0)))) { $synch_offset_warning = 'Unknown data before synch '; if (isset($info['id3v2']['headerlength'])) { $synch_offset_warning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, '; } else { $synch_offset_warning .= '(should be at beginning of file, '; } $synch_offset_warning .= 'synch detected at '.$info['avdataoffset'].')'; if ($info['audio']['bitrate_mode'] == 'cbr') { if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) { $synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.'; $info['audio']['codec'] = 'LAME'; $current_data_lame_version_string = 'LAME3.'; } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) { $synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.'; $info['audio']['codec'] = 'LAME'; $current_data_lame_version_string = 'LAME3.'; } } $this->getid3->warning($synch_offset_warning); } if (isset($info['mpeg']['audio']['LAME'])) { $info['audio']['codec'] = 'LAME'; if (!empty($info['mpeg']['audio']['LAME']['long_version'])) { $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00"); } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) { $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00"); } } $current_data_lame_version_string = (!empty($current_data_lame_version_string) ? $current_data_lame_version_string : @$info['audio']['encoder']); if (!empty($current_data_lame_version_string) && (substr($current_data_lame_version_string, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($current_data_lame_version_string, -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 $possibly_longer_lame_version_frame_length = 1441; // Not sure what version of LAME this is - look in padding of last frame for longer version string $possible_lame_version_string_offset = $info['avdataend'] - $possibly_longer_lame_version_frame_length; fseek($fd, $possible_lame_version_string_offset); $possibly_longer_lame_version_data = fread($fd, $possibly_longer_lame_version_frame_length); switch (substr($current_data_lame_version_string, -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 $current_data_lame_version_string = substr($current_data_lame_version_string, 0, -1); break; } if (($possibly_longer_lame_version_string = strstr($possibly_longer_lame_version_data, $current_data_lame_version_string)) !== false) { if (substr($possibly_longer_lame_version_string, 0, strlen($current_data_lame_version_string)) == $current_data_lame_version_string) { $possibly_longer_lame_version_new_string = substr($possibly_longer_lame_version_string, 0, strspn($possibly_longer_lame_version_string, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)" if (strlen($possibly_longer_lame_version_new_string) > strlen(@$info['audio']['encoder'])) { $info['audio']['encoder'] = $possibly_longer_lame_version_new_string; } } } } if (!empty($info['audio']['encoder'])) { $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 "); } switch (@$info['mpeg']['audio']['layer']) { case 1: case 2: $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer']; break; } if (@$info['fileformat'] == 'mp3') { switch ($info['audio']['dataformat']) { case 'mp1': case 'mp2': case 'mp3': $info['fileformat'] = $info['audio']['dataformat']; break; default: $this->getid3->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"'); break; } } $info['mime_type'] = 'audio/mpeg'; $info['audio']['lossless'] = false; // Calculate playtime if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) { $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate']; } $info['audio']['encoder_options'] = getid3_mp3::GuessEncoderOptions($info); return true; } public static function GuessEncoderOptions(&$info) { // shortcuts if (!empty($info['mpeg']['audio'])) { $thisfile_mpeg_audio = &$info['mpeg']['audio']; if (!empty($thisfile_mpeg_audio['LAME'])) { $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; } } $encoder_options = ''; static $named_preset_bitrates = array (16, 24, 40, 56, 112, 128, 160, 192, 256); if ((@$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'], $named_preset_bitrates))) { $encoder_options = $thisfile_mpeg_audio_lame['preset_used']; } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) { static $known_encoder_values = array (); if (empty($known_encoder_values)) { //$known_encoder_values[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name'; $known_encoder_values[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92 $known_encoder_values[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91 $known_encoder_values[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95 $known_encoder_values['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92 $known_encoder_values['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91 $known_encoder_values['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3 $known_encoder_values['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92 $known_encoder_values['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91 $known_encoder_values['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $known_encoder_values['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3 $known_encoder_values['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $known_encoder_values['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3 $known_encoder_values['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92 $known_encoder_values['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91 $known_encoder_values['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95 $known_encoder_values['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3 $known_encoder_values['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3 $known_encoder_values[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $known_encoder_values[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1 $known_encoder_values[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93 $known_encoder_values[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95 $known_encoder_values[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $known_encoder_values[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1 $known_encoder_values[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93 $known_encoder_values[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95 $known_encoder_values[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $known_encoder_values[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1 $known_encoder_values[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95 $known_encoder_values[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $known_encoder_values[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $known_encoder_values[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 $known_encoder_values[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1 $known_encoder_values[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95 $known_encoder_values[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1 $known_encoder_values[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95 $known_encoder_values[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14 $known_encoder_values[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92 $known_encoder_values[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91 $known_encoder_values[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1 $known_encoder_values[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95 $known_encoder_values[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14 $known_encoder_values[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15 $known_encoder_values[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1 $known_encoder_values[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93 $known_encoder_values[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95 $known_encoder_values[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14 $known_encoder_values[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15 $known_encoder_values[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1 $known_encoder_values[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93 $known_encoder_values[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95 } if (isset($known_encoder_values[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$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 = $known_encoder_values[$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($known_encoder_values['**'][$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 = $known_encoder_values['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; } elseif ($info['audio']['bitrate_mode'] == 'vbr') { // http://gabriel.mp3-tech.org/mp3infotag.html // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h $lame_v_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10); $lame_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($lame_v_value * 10); $encoder_options = '-V'.$lame_v_value.' -q'.$lame_q_value; } elseif ($info['audio']['bitrate_mode'] == 'cbr') { $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); } else { $encoder_options = strtoupper($info['audio']['bitrate_mode']); } } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr']; } elseif (!empty($info['audio']['bitrate'])) { if ($info['audio']['bitrate_mode'] == 'cbr') { $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); } else { $encoder_options = strtoupper($info['audio']['bitrate_mode']); } } if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min']; } if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) { $encoder_options .= ' --nogap'; } if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) { $exploded_options = explode(' ', $encoder_options, 4); if ($exploded_options[0] == '--r3mix') { $exploded_options[1] = 'r3mix'; } switch ($exploded_options[0]) { case '--preset': case '--alt-preset': case '--r3mix': if ($exploded_options[1] == 'fast') { $exploded_options[1] .= ' '.$exploded_options[2]; } switch ($exploded_options[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 $expected_lowpass = array ( 'insane|20500' => 20500, 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91 'medium|18000' => 18000, 'fast medium|18000' => 18000, 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 'standard|19000' => 19000, 'fast standard|19000' => 19000, 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91 'r3mix|18000' => 18000, // 3.94, 3.95 ); if (!isset($expected_lowpass[$exploded_options[1].'|'.$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+ $exploded_options = explode(' ', $encoder_options, 4); switch ($exploded_options[0]) { case '--preset': case '--alt-preset': switch ($exploded_options[1]) { case 'fast': case 'portable': case 'medium': case 'standard': case 'extreme': case 'insane': $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; break; default: static $expected_resampled_rate = array ( 'phon+/lw/mw-eu/sw|16000' => 16000, 'mw-us|24000' => 24000, // 3.95 'mw-us|32000' => 32000, // 3.93 'mw-us|16000' => 16000, // 3.92 'phone|16000' => 16000, 'phone|11025' => 11025, // 3.94a15 'radio|32000' => 32000, // 3.94a15 'fm/radio|32000' => 32000, // 3.92 'fm|32000' => 32000, // 3.90 'voice|32000' => 32000); if (!isset($expected_resampled_rate[$exploded_options[1].'|'.$thisfile_mpeg_audio['sample_rate']])) { $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; } break; } break; case '--r3mix': default: $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; break; } break; } } } if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) { //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); $encoder_options = strtoupper($info['audio']['bitrate_mode']); } return $encoder_options; } public function decodeMPEGaudioHeader($fd, $offset, &$info, $recursive_search=true, $scan_as_cbr=false, $fast_mpeg_header_scan=false) { static $mpeg_audio_version_lookup; static $mpeg_audio_layer_lookup; static $mpeg_audio_bitrate_lookup; static $mpeg_audio_frequency_lookup; static $mpeg_audio_channel_mode_lookup; static $mpeg_audio_mode_extension_lookup; static $mpeg_audio_emphasis_lookup; if (empty($mpeg_audio_version_lookup)) { $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); $mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray(); $mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray(); $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray(); $mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray(); } if ($offset >= $info['avdataend']) { // non-fatal error: 'end of file encounter looking for MPEG synch' return; } fseek($fd, $offset, SEEK_SET); $header_string = fread($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 $head4 = substr($header_string, 0, 4); if (isset($mpeg_audio_header_decode_cache[$head4])) { $mpeg_header_raw_array= $mpeg_audio_header_decode_cache[$head4]; } else { $mpeg_header_raw_array = getid3_mp3::MPEGaudioHeaderDecode($head4); $mpeg_audio_header_decode_cache[$head4] = $mpeg_header_raw_array; } // Not in cache if (!isset($mpeg_audio_header_valid_cache[$head4])) { $mpeg_audio_header_valid_cache[$head4] = getid3_mp3::MPEGaudioHeaderValid($mpeg_header_raw_array, false, false); } // shortcut if (!isset($info['mpeg']['audio'])) { $info['mpeg']['audio'] = array (); } $thisfile_mpeg_audio = &$info['mpeg']['audio']; if ($mpeg_audio_header_valid_cache[$head4]) { $thisfile_mpeg_audio['raw'] = $mpeg_header_raw_array; } else { // non-fatal error: Invalid MPEG audio header at offset $offset return; } if (!$fast_mpeg_header_scan) { $thisfile_mpeg_audio['version'] = $mpeg_audio_version_lookup[$thisfile_mpeg_audio['raw']['version']]; $thisfile_mpeg_audio['layer'] = $mpeg_audio_layer_lookup[$thisfile_mpeg_audio['raw']['layer']]; $thisfile_mpeg_audio['channelmode'] = $mpeg_audio_channel_mode_lookup[$thisfile_mpeg_audio['raw']['channelmode']]; $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2); $thisfile_mpeg_audio['sample_rate'] = $mpeg_audio_frequency_lookup[$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'] = $mpeg_audio_mode_extension_lookup[$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'] = $mpeg_audio_emphasis_lookup[$thisfile_mpeg_audio['raw']['emphasis']]; $info['audio']['channels'] = $thisfile_mpeg_audio['channels']; $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; if ($thisfile_mpeg_audio['protection']) { $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($header_string, 4, 2)); } } if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) { // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 $this->getid3->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'] = $mpeg_audio_bitrate_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) { // only skip multiple frame check if free-format bitstream found at beginning of file // otherwise is quite possibly simply corrupted data $recursive_search = false; } // For Layer 2 there are some combinations of bitrate and mode which are not allowed. if (!$fast_mpeg_header_scan && ($thisfile_mpeg_audio['layer'] == '2')) { $info['audio']['dataformat'] = 'mp2'; switch ($thisfile_mpeg_audio['channelmode']) { case 'mono': if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { // these are ok } else { // non-fatal error: bitrate not allowed in Layer 2/mono return; } break; case 'stereo': case 'joint stereo': case 'dual channel': if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { // these are ok } else { // non-fatal error: bitrate not allowed in Layer 2/stereo/joint stereo/dual channel return; } break; } } if ($info['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'], $info['audio']['sample_rate']); } $next_frame_test_offset = $offset + 1; if ($thisfile_mpeg_audio['bitrate'] != 'free') { $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; if (isset($thisfile_mpeg_audio['framelength'])) { $next_frame_test_offset = $offset + $thisfile_mpeg_audio['framelength']; } else { // non-fatal error: Frame at offset('.$offset.') is has an invalid frame length. return; } } $expected_number_of_audio_bytes = 0; //////////////////////////////////////////////////////////////////////////////////// // Variable-bitrate headers if (substr($header_string, 4 + 32, 4) == 'VBRI') { // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; $info['audio']['codec'] = 'Fraunhofer'; $side_info_data = substr($header_string, 4 + 2, 32); $fraunhofer_vbr_offset = 36; $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 4, 2)); // VbriVersion $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 6, 2)); // VbriDelay $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 8, 2)); // VbriQuality $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 10, 4)); // VbriStreamBytes $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 14, 4)); // VbriStreamFrames $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 18, 2)); // VbriTableSize $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 20, 2)); // VbriTableScale $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 22, 2)); // VbriEntryBytes $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 24, 2)); // VbriEntryFrames $expected_number_of_audio_bytes = $thisfile_mpeg_audio['VBR_bytes']; $previous_byte_offset = $offset; for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { $fraunhofer_offset_n = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset, $thisfile_mpeg_audio['VBR_entry_bytes'])); $fraunhofer_vbr_offset += $thisfile_mpeg_audio['VBR_entry_bytes']; $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']); $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']) + $previous_byte_offset; $previous_byte_offset += $fraunhofer_offset_n; } } 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 $vbr_id_offset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); $side_info_data = substr($header_string, 4 + 2, $vbr_id_offset - 4); if ((substr($header_string, $vbr_id_offset, strlen('Xing')) == 'Xing') || (substr($header_string, $vbr_id_offset, 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 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; $thisfile_mpeg_audio['VBR_method'] = 'Xing'; $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 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']) { $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 8, 4)); } if ($thisfile_mpeg_audio['xing_flags']['bytes']) { $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 12, 4)); } if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { $frame_lengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']; if ($thisfile_mpeg_audio['layer'] == '1') { // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 $info['audio']['bitrate'] = ($frame_lengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12; } else { // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 $info['audio']['bitrate'] = $frame_lengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144; } $thisfile_mpeg_audio['framelength'] = floor($frame_lengthfloat); } if ($thisfile_mpeg_audio['xing_flags']['toc']) { $lame_toc_data = substr($header_string, $vbr_id_offset + 16, 100); for ($i = 0; $i < 100; $i++) { $thisfile_mpeg_audio['toc'][$i] = ord($lame_toc_data{$i}); } } if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 116, 4)); } // http://gabriel.mp3-tech.org/mp3infotag.html if (substr($header_string, $vbr_id_offset + 120, 4) == 'LAME') { // shortcut $thisfile_mpeg_audio['LAME'] = array (); $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; $thisfile_mpeg_audio_lame['long_version'] = substr($header_string, $vbr_id_offset + 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 $lame_tag_offset_contant = $vbr_id_offset - 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']); $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0x9B, 1)); // bytes $9C-$A4 Encoder short VersionString $thisfile_mpeg_audio_lame['short_version'] = substr($header_string, $lame_tag_offset_contant + 0x9C, 9); // byte $A5 Info Tag revision + VBR method $lame_tagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA5, 1)); $thisfile_mpeg_audio_lame['tag_revision'] = ($lame_tagRevisionVBRmethod & 0xF0) >> 4; $thisfile_mpeg_audio_lame_raw['vbr_method'] = $lame_tagRevisionVBRmethod & 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 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 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 $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 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 $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($header_string, $lame_tag_offset_contant + 0xA7, 4)); } if ($thisfile_mpeg_audio_lame_rgad['peak_amplitude'] == 0) { unset($thisfile_mpeg_audio_lame_rgad['peak_amplitude']); } else { $thisfile_mpeg_audio_lame_rgad['peak_db'] = 20 * log10($thisfile_mpeg_audio_lame_rgad['peak_amplitude']); } $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAB, 2)); $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAD, 2)); if ($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; $thisfile_mpeg_audio_lame_rgad_track['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['name']); $thisfile_mpeg_audio_lame_rgad_track['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['originator']); $thisfile_mpeg_audio_lame_rgad_track['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit']); if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) { $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude']; } $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_rgad_track['originator']; $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_track['gain_db']; } else { unset($thisfile_mpeg_audio_lame_rgad['track']); } if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) { $thisfile_mpeg_audio_lame_rgad_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; $thisfile_mpeg_audio_lame_rgad_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; $thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; $thisfile_mpeg_audio_lame_rgad_album['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['name']); $thisfile_mpeg_audio_lame_rgad_album['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['originator']); $thisfile_mpeg_audio_lame_rgad_album['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit']); if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) { $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude']; } $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_rgad_album['originator']; $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_album['gain_db']; } else { unset($thisfile_mpeg_audio_lame_rgad['album']); } if (empty($thisfile_mpeg_audio_lame_rgad)) { unset($thisfile_mpeg_audio_lame['RGAD']); } // byte $AF Encoding flags + ATH Type $encoding_flags_ath_type = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAF, 1)); $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($encoding_flags_ath_type & 0x10); $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($encoding_flags_ath_type & 0x20); $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($encoding_flags_ath_type & 0x40); $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($encoding_flags_ath_type & 0x80); $thisfile_mpeg_audio_lame['ath_type'] = $encoding_flags_ath_type & 0x0F; // byte $B0 if ABR {specified bitrate} else {minimal bitrate} $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB0, 1)); if ($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 $encoder_delays = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB1, 3)); $thisfile_mpeg_audio_lame['encoder_delay'] = ($encoder_delays & 0xFFF000) >> 12; $thisfile_mpeg_audio_lame['end_padding'] = $encoder_delays & 0x000FFF; // byte $B4 Misc $misc_byte = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB4, 1)); $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($misc_byte & 0x03); $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($misc_byte & 0x1C) >> 2; $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($misc_byte & 0x20) >> 5; $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($misc_byte & 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 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB5, 1), false, true); $thisfile_mpeg_audio_lame['mp3_gain_db'] = (20 * log10(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 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB6, 2)); // Reserved = ($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'])) { $this->getid3->warning('Unknown LAME preset used ('.$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 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB8, 4)); $expected_number_of_audio_bytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); // bytes $BC-$BD MusicCRC $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBC, 2)); // bytes $BE-$BF CRC-16 of Info Tag $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBE, 2)); // LAME CBR if ($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']); $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; } } } } else { // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; if ($recursive_search) { $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; if (getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, true)) { $recursive_search = false; $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; } if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { $this->getid3->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'); } } } } if (($expected_number_of_audio_bytes > 0) && ($expected_number_of_audio_bytes != ($info['avdataend'] - $info['avdataoffset']))) { if ($expected_number_of_audio_bytes > ($info['avdataend'] - $info['avdataoffset'])) { if (($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) { $this->getid3->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'); } else { $this->getid3->warning('Probable truncated file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)'); } } else { if ((($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes) == 1) { $info['avdataend']--; } else { $this->getid3->warning('Too much data in file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes).' bytes too many)'); } } } if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) { if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { $frame_byte_length = getid3_mp3::FreeFormatFrameLength($fd, $offset, $info, true); if ($frame_byte_length > 0) { $thisfile_mpeg_audio['framelength'] = $frame_byte_length; if ($thisfile_mpeg_audio['layer'] == '1') { // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 $info['audio']['bitrate'] = ((($frame_byte_length / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; } else { // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 $info['audio']['bitrate'] = (($frame_byte_length - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; } } else { // non-fatal error: Error calculating frame length of free-format MP3 without Xing/LAME header. return; } } } if (@$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'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['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'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 576); } else { $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 1152); } if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion } break; } } // End variable-bitrate headers //////////////////////////////////////////////////////////////////////////////////// if ($recursive_search) { if (!getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, $scan_as_cbr)) { return false; } } return true; } public function RecursiveFrameScanning(&$fd, &$info, &$offset, &$next_frame_test_offset, $scan_as_cbr) { for ($i = 0; $i < getid3_mp3::VALID_CHECK_FRAMES; $i++) { // check next getid3_mp3::VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch if (($next_frame_test_offset + 4) >= $info['avdataend']) { // end of file return true; } $next_frame_test_array = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']); if ($this->decodeMPEGaudioHeader($fd, $next_frame_test_offset, $next_frame_test_array, false)) { if ($scan_as_cbr) { // 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($next_frame_test_array['mpeg']['audio']['bitrate']) || !isset($info['mpeg']['audio']['bitrate']) || ($next_frame_test_array['mpeg']['audio']['bitrate'] != $info['mpeg']['audio']['bitrate'])) { return false; } } // next frame is OK, get ready to check the one after that if (isset($next_frame_test_array['mpeg']['audio']['framelength']) && ($next_frame_test_array['mpeg']['audio']['framelength'] > 0)) { $next_frame_test_offset += $next_frame_test_array['mpeg']['audio']['framelength']; } else { // non-fatal error: Frame at offset $offset has an invalid frame length. return; } } else { // non-fatal error: Next frame is not valid. return; } } return true; } public function FreeFormatFrameLength($fd, $offset, &$info, $deep_scan=false) { fseek($fd, $offset, SEEK_SET); $mpeg_audio_data = fread($fd, 32768); $sync_pattern1 = substr($mpeg_audio_data, 0, 4); // may be different pattern due to padding $sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) | 0x02).$sync_pattern1{3}; if ($sync_pattern2 === $sync_pattern1) { $sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) & 0xFD).$sync_pattern1{3}; } $frame_length = false; $frame_length1 = strpos($mpeg_audio_data, $sync_pattern1, 4); $frame_length2 = strpos($mpeg_audio_data, $sync_pattern2, 4); if ($frame_length1 > 4) { $frame_length = $frame_length1; } if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) { $frame_length = $frame_length2; } if (!$frame_length) { // LAME 3.88 has a different value for modeextension on the first frame vs the rest $frame_length1 = strpos($mpeg_audio_data, substr($sync_pattern1, 0, 3), 4); $frame_length2 = strpos($mpeg_audio_data, substr($sync_pattern2, 0, 3), 4); if ($frame_length1 > 4) { $frame_length = $frame_length1; } if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) { $frame_length = $frame_length2; } if (!$frame_length) { throw new getid3_exception('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($sync_pattern1).' or '.getid3_lib::PrintHexBytes($sync_pattern2).') after offset '.$offset); } else { $this->getid3->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'); $info['audio']['codec'] = 'LAME'; $info['audio']['encoder'] = 'LAME3.88'; $sync_pattern1 = substr($sync_pattern1, 0, 3); $sync_pattern2 = substr($sync_pattern2, 0, 3); } } if ($deep_scan) { $actual_frame_length_values = array (); $next_offset = $offset + $frame_length; while ($next_offset < ($info['avdataend'] - 6)) { fseek($fd, $next_offset - 1, SEEK_SET); $NextSyncPattern = fread($fd, 6); if ((substr($NextSyncPattern, 1, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 1, strlen($sync_pattern2)) == $sync_pattern2)) { // good - found where expected $actual_frame_length_values[] = $frame_length; } elseif ((substr($NextSyncPattern, 0, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 0, strlen($sync_pattern2)) == $sync_pattern2)) { // ok - found one byte earlier than expected (last frame wasn't padded, first frame was) $actual_frame_length_values[] = ($frame_length - 1); $next_offset--; } elseif ((substr($NextSyncPattern, 2, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 2, strlen($sync_pattern2)) == $sync_pattern2)) { // ok - found one byte later than expected (last frame was padded, first frame wasn't) $actual_frame_length_values[] = ($frame_length + 1); $next_offset++; } else { throw new getid3_exception('Did not find expected free-format sync pattern at offset '.$next_offset); } $next_offset += $frame_length; } if (count($actual_frame_length_values) > 0) { $frame_length = intval(round(array_sum($actual_frame_length_values) / count($actual_frame_length_values))); } } return $frame_length; } public function getOnlyMPEGaudioInfo($fd, &$info, $avdata_offset, $bit_rate_histogram=false) { // looks for synch, decodes MPEG audio header fseek($fd, $avdata_offset, SEEK_SET); $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdata_offset); $header = fread($fd, $sync_seek_buffer_size); $sync_seek_buffer_size = strlen($header); $synch_seek_offset = 0; static $mpeg_audio_version_lookup; static $mpeg_audio_layer_lookup; static $mpeg_audio_bitrate_lookup; if (empty($mpeg_audio_version_lookup)) { $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); } while ($synch_seek_offset < $sync_seek_buffer_size) { if ((($avdata_offset + $synch_seek_offset) < $info['avdataend']) && !feof($fd)) { // if a synch's not found within the first 128k bytes, then give up if ($synch_seek_offset > $sync_seek_buffer_size) { throw new getid3_exception('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB'); } if (feof($fd)) { throw new getid3_exception('Could not find valid MPEG audio synch before end of file'); } } if (($synch_seek_offset + 1) >= strlen($header)) { throw new getid3_exception('Could not find valid MPEG synch before end of file'); } if (($header{$synch_seek_offset} == "\xFF") && ($header{($synch_seek_offset + 1)} > "\xE0")) { // synch detected if (!isset($first_frame_info) && !isset($info['mpeg']['audio'])) { $first_frame_info = $info; $first_frame_avdata_offset = $avdata_offset + $synch_seek_offset; if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $first_frame_info, false)) { // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below unset($first_frame_info); } } $dummy = $info; // only overwrite real data if valid header found if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $dummy, true)) { $info = $dummy; $info['avdataoffset'] = $avdata_offset + $synch_seek_offset; switch (@$info['fileformat']) { case '': case 'mp3': $info['fileformat'] = 'mp3'; $info['audio']['dataformat'] = 'mp3'; break; } if (isset($first_frame_info['mpeg']['audio']['bitrate_mode']) && ($first_frame_info['mpeg']['audio']['bitrate_mode'] == 'vbr')) { if (!(abs($info['audio']['bitrate'] - $first_frame_info['audio']['bitrate']) <= 1)) { // If there is garbage data between a valid VBR header frame and a sequence // of valid MPEG-audio frames the VBR data is no longer discarded. $info = $first_frame_info; $info['avdataoffset'] = $first_frame_avdata_offset; $info['fileformat'] = 'mp3'; $info['audio']['dataformat'] = 'mp3'; $dummy = $info; unset($dummy['mpeg']['audio']); $GarbageOffsetStart = $first_frame_avdata_offset + $first_frame_info['mpeg']['audio']['framelength']; $GarbageOffsetEnd = $avdata_offset + $synch_seek_offset; if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) { $info = $dummy; $info['avdataoffset'] = $GarbageOffsetEnd; $this->getid3->warning('apparently-valid VBR header not used because could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd); } else { $this->getid3->warning('using data from VBR header even though could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')'); } } } if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) { // VBR file with no VBR header $bit_rate_histogram = true; } if ($bit_rate_histogram) { $info['mpeg']['audio']['stereo_distribution'] = array ('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0); $info['mpeg']['audio']['version_distribution'] = array ('1'=>0, '2'=>0, '2.5'=>0); if ($info['mpeg']['audio']['version'] == '1') { if ($info['mpeg']['audio']['layer'] == 3) { $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0); } elseif ($info['mpeg']['audio']['layer'] == 2) { $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0); } elseif ($info['mpeg']['audio']['layer'] == 1) { $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0); } } elseif ($info['mpeg']['audio']['layer'] == 1) { $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0); } else { $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0); } $dummy = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']); $synch_start_offset = $info['avdataoffset']; $fast_mode = false; $synch_errors_found = 0; while ($this->decodeMPEGaudioHeader($fd, $synch_start_offset, $dummy, false, false, $fast_mode)) { $fast_mode = true; $thisframebitrate = $mpeg_audio_bitrate_lookup[$mpeg_audio_version_lookup[$dummy['mpeg']['audio']['raw']['version']]][$mpeg_audio_layer_lookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']]; if (empty($dummy['mpeg']['audio']['framelength'])) { $synch_errors_found++; } else { @$info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++; @$info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++; @$info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++; $synch_start_offset += $dummy['mpeg']['audio']['framelength']; } } if ($synch_errors_found > 0) { $this->getid3->warning('Found '.$synch_errors_found.' synch errors in histogram analysis'); } $bit_total = 0; $frame_counter = 0; foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) { $frame_counter += $bit_rate_count; if ($bit_rate_value != 'free') { $bit_total += ($bit_rate_value * $bit_rate_count); } } if ($frame_counter == 0) { throw new getid3_exception('Corrupt MP3 file: framecounter == zero'); } $info['mpeg']['audio']['frame_count'] = $frame_counter; $info['mpeg']['audio']['bitrate'] = ($bit_total / $frame_counter); $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently $distinct_bit_rates = 0; foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) { if ($bit_rate_count > 0) { $distinct_bit_rates++; } } if ($distinct_bit_rates > 1) { $info['mpeg']['audio']['bitrate_mode'] = 'vbr'; } else { $info['mpeg']['audio']['bitrate_mode'] = 'cbr'; } $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; } break; // exit while() } } $synch_seek_offset++; if (($avdata_offset + $synch_seek_offset) >= $info['avdataend']) { // end of file/data if (empty($info['mpeg']['audio'])) { throw new getid3_exception('could not find valid MPEG synch before end of file'); } break; } } $info['audio']['channels'] = $info['mpeg']['audio']['channels']; $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode']; $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; return true; } public static function MPEGaudioVersionarray() { static $array = array ('2.5', false, '2', '1'); return $array; } public static function MPEGaudioLayerarray() { static $array = array (false, 3, 2, 1); return $array; } public static function MPEGaudioBitratearray() { static $array; if (empty($array)) { $array = 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), ) ); $array['2'][3] = $array['2'][2]; $array['2.5'] = $array['2']; } return $array; } public static function MPEGaudioFrequencyarray() { static $array = array ( '1' => array (44100, 48000, 32000), '2' => array (22050, 24000, 16000), '2.5' => array (11025, 12000, 8000) ); return $array; } public static function MPEGaudioChannelModearray() { static $array = array ('stereo', 'joint stereo', 'dual channel', 'mono'); return $array; } public static function MPEGaudioModeExtensionarray() { static $array = 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 $array; } public static function MPEGaudioEmphasisarray() { static $array = array ('none', '50/15ms', false, 'CCIT J.17'); return $array; } public static function MPEGaudioHeaderBytesValid($head4, $allow_bitrate_15=false) { return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allow_bitrate_15); } public static function MPEGaudioHeaderValid($raw_array, $echo_errors=false, $allow_bitrate_15=false) { if (($raw_array['synch'] & 0x0FFE) != 0x0FFE) { return false; } static $mpeg_audio_version_lookup; static $mpeg_audio_layer_lookup; static $mpeg_audio_bitrate_lookup; static $mpeg_audio_frequency_lookup; static $mpeg_audio_channel_mode_lookup; static $mpeg_audio_mode_extension_lookup; static $mpeg_audio_emphasis_lookup; if (empty($mpeg_audio_version_lookup)) { $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); $mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray(); $mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray(); $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray(); $mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray(); } if (isset($mpeg_audio_version_lookup[$raw_array['version']])) { $decodedVersion = $mpeg_audio_version_lookup[$raw_array['version']]; } else { echo ($echo_errors ? "\n".'invalid Version ('.$raw_array['version'].')' : ''); return false; } if (isset($mpeg_audio_layer_lookup[$raw_array['layer']])) { $decodedLayer = $mpeg_audio_layer_lookup[$raw_array['layer']]; } else { echo ($echo_errors ? "\n".'invalid Layer ('.$raw_array['layer'].')' : ''); return false; } if (!isset($mpeg_audio_bitrate_lookup[$decodedVersion][$decodedLayer][$raw_array['bitrate']])) { echo ($echo_errors ? "\n".'invalid Bitrate ('.$raw_array['bitrate'].')' : ''); if ($raw_array['bitrate'] == 15) { // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0 // let it go through here otherwise file will not be identified if (!$allow_bitrate_15) { return false; } } else { return false; } } if (!isset($mpeg_audio_frequency_lookup[$decodedVersion][$raw_array['sample_rate']])) { echo ($echo_errors ? "\n".'invalid Frequency ('.$raw_array['sample_rate'].')' : ''); return false; } if (!isset($mpeg_audio_channel_mode_lookup[$raw_array['channelmode']])) { echo ($echo_errors ? "\n".'invalid ChannelMode ('.$raw_array['channelmode'].')' : ''); return false; } if (!isset($mpeg_audio_mode_extension_lookup[$decodedLayer][$raw_array['modeextension']])) { echo ($echo_errors ? "\n".'invalid Mode Extension ('.$raw_array['modeextension'].')' : ''); return false; } if (!isset($mpeg_audio_emphasis_lookup[$raw_array['emphasis']])) { echo ($echo_errors ? "\n".'invalid Emphasis ('.$raw_array['emphasis'].')' : ''); return false; } // These are just either set or not set, you can't mess that up :) // $raw_array['protection']; // $raw_array['padding']; // $raw_array['private']; // $raw_array['copyright']; // $raw_array['original']; return true; } public static function MPEGaudioHeaderDecode($header_four_bytes) { // 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($header_four_bytes) != 4) { return false; } $mpeg_raw_header['synch'] = (getid3_lib::BigEndian2Int(substr($header_four_bytes, 0, 2)) & 0xFFE0) >> 4; $mpeg_raw_header['version'] = (ord($header_four_bytes{1}) & 0x18) >> 3; // BB $mpeg_raw_header['layer'] = (ord($header_four_bytes{1}) & 0x06) >> 1; // CC $mpeg_raw_header['protection'] = (ord($header_four_bytes{1}) & 0x01); // D $mpeg_raw_header['bitrate'] = (ord($header_four_bytes{2}) & 0xF0) >> 4; // EEEE $mpeg_raw_header['sample_rate'] = (ord($header_four_bytes{2}) & 0x0C) >> 2; // FF $mpeg_raw_header['padding'] = (ord($header_four_bytes{2}) & 0x02) >> 1; // G $mpeg_raw_header['private'] = (ord($header_four_bytes{2}) & 0x01); // H $mpeg_raw_header['channelmode'] = (ord($header_four_bytes{3}) & 0xC0) >> 6; // II $mpeg_raw_header['modeextension'] = (ord($header_four_bytes{3}) & 0x30) >> 4; // JJ $mpeg_raw_header['copyright'] = (ord($header_four_bytes{3}) & 0x08) >> 3; // K $mpeg_raw_header['original'] = (ord($header_four_bytes{3}) & 0x04) >> 2; // L $mpeg_raw_header['emphasis'] = (ord($header_four_bytes{3}) & 0x03); // MM return $mpeg_raw_header; } public static function MPEGaudioFrameLength(&$bit_rate, &$version, &$layer, $padding, &$sample_rate) { if (!isset($cache[$bit_rate][$version][$layer][$padding][$sample_rate])) { $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = false; if ($bit_rate != 'free') { if ($version == '1') { if ($layer == '1') { // For Layer I slot is 32 bits long $frame_length_coefficient = 48; $slot_length = 4; } else { // Layer 2 / 3 // for Layer 2 and Layer 3 slot is 8 bits long. $frame_length_coefficient = 144; $slot_length = 1; } } else { // MPEG-2 / MPEG-2.5 if ($layer == '1') { // For Layer I slot is 32 bits long $frame_length_coefficient = 24; $slot_length = 4; } elseif ($layer == '2') { // for Layer 2 and Layer 3 slot is 8 bits long. $frame_length_coefficient = 144; $slot_length = 1; } else { // layer 3 // for Layer 2 and Layer 3 slot is 8 bits long. $frame_length_coefficient = 72; $slot_length = 1; } } // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding if ($sample_rate > 0) { $new_frame_length = ($frame_length_coefficient * $bit_rate) / $sample_rate; $new_frame_length = floor($new_frame_length / $slot_length) * $slot_length; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I) if ($padding) { $new_frame_length += $slot_length; } $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = (int) $new_frame_length; } } } return $cache[$bit_rate][$version][$layer][$padding][$sample_rate]; } public static function ClosestStandardMP3Bitrate($bit_rate) { static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000); static $bit_rate_table = array (0=>'-'); $round_bit_rate = intval(round($bit_rate, -3)); if (!isset($bit_rate_table[$round_bit_rate])) { if ($round_bit_rate > 320000) { $bit_rate_table[$round_bit_rate] = round($bit_rate, -4); } else { $last_bit_rate = 320000; foreach ($standard_bit_rates as $standard_bit_rate) { $bit_rate_table[$round_bit_rate] = $standard_bit_rate; if ($round_bit_rate >= $standard_bit_rate - (($last_bit_rate - $standard_bit_rate) / 2)) { break; } $last_bit_rate = $standard_bit_rate; } } } return $bit_rate_table[$round_bit_rate]; } public static function XingVBRidOffset($version, $channel_mode) { static $lookup = 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 $lookup[$version][$channel_mode]; } public static function LAMEvbrMethodLookup($vbr_method_id) { static $lookup = array ( 0x00 => 'unknown', 0x01 => 'cbr', 0x02 => 'abr', 0x03 => 'vbr-old / vbr-rh', 0x04 => 'vbr-new / vbr-mtrh', 0x05 => 'vbr-mt', 0x06 => 'Full VBR Method 4', 0x08 => 'constant bitrate 2 pass', 0x09 => 'abr 2 pass', 0x0F => 'reserved' ); return (isset($lookup[$vbr_method_id]) ? $lookup[$vbr_method_id] : ''); } public static function LAMEmiscStereoModeLookup($stereo_mode_id) { static $lookup = array ( 0 => 'mono', 1 => 'stereo', 2 => 'dual mono', 3 => 'joint stereo', 4 => 'forced stereo', 5 => 'auto', 6 => 'intensity stereo', 7 => 'other' ); return (isset($lookup[$stereo_mode_id]) ? $lookup[$stereo_mode_id] : ''); } public static function LAMEmiscSourceSampleFrequencyLookup($source_sample_frequency_id) { static $lookup = array ( 0 => '<= 32 kHz', 1 => '44.1 kHz', 2 => '48 kHz', 3 => '> 48kHz' ); return (isset($lookup[$source_sample_frequency_id]) ? $lookup[$source_sample_frequency_id] : ''); } public static function LAMEsurroundInfoLookup($surround_info_id) { static $lookup = array ( 0 => 'no surround info', 1 => 'DPL encoding', 2 => 'DPL2 encoding', 3 => 'Ambisonic encoding' ); return (isset($lookup[$surround_info_id]) ? $lookup[$surround_info_id] : 'reserved'); } public static function LAMEpresetUsedLookup($lame_tag) { if ($lame_tag['preset_used_id'] == 0) { // no preset used (LAME >=3.93) // no preset recorded (LAME <3.93) return ''; } $lame_preset_used_lookup = array (); for ($i = 8; $i <= 320; $i++) { switch ($lame_tag['vbr_method']) { case 'cbr': $lame_preset_used_lookup[$i] = '--alt-preset '.$lame_tag['vbr_method'].' '.$i; break; case 'abr': default: // other VBR modes shouldn't be here(?) $lame_preset_used_lookup[$i] = '--alt-preset '.$i; break; } } // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions() // named alt-presets $lame_preset_used_lookup[1000] = '--r3mix'; $lame_preset_used_lookup[1001] = '--alt-preset standard'; $lame_preset_used_lookup[1002] = '--alt-preset extreme'; $lame_preset_used_lookup[1003] = '--alt-preset insane'; $lame_preset_used_lookup[1004] = '--alt-preset fast standard'; $lame_preset_used_lookup[1005] = '--alt-preset fast extreme'; $lame_preset_used_lookup[1006] = '--alt-preset medium'; $lame_preset_used_lookup[1007] = '--alt-preset fast medium'; // LAME 3.94 additions/changes $lame_preset_used_lookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003 $lame_preset_used_lookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003 $lame_preset_used_lookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003 $lame_preset_used_lookup[410] = '-V9'; $lame_preset_used_lookup[420] = '-V8'; $lame_preset_used_lookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003 $lame_preset_used_lookup[440] = '-V6'; $lame_preset_used_lookup[450] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003 $lame_preset_used_lookup[460] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003 $lame_preset_used_lookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003 $lame_preset_used_lookup[480] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003 $lame_preset_used_lookup[490] = '-V1'; $lame_preset_used_lookup[500] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003 return (isset($lame_preset_used_lookup[$lame_tag['preset_used_id']]) ? $lame_preset_used_lookup[$lame_tag['preset_used_id']] : 'new/unknown preset: '.$lame_tag['preset_used_id'].' - report to info@getid3.org'); } } ?>