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<?php |
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// +----------------------------------------------------------------------+ |
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// | PHP version 5 | |
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// +----------------------------------------------------------------------+ |
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// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | |
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// +----------------------------------------------------------------------+ |
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// | This source file is subject to version 2 of the GPL license, | |
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// | that is bundled with this package in the file license.txt and is | |
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// | available through the world-wide-web at the following url: | |
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// | http://www.gnu.org/copyleft/gpl.html | |
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// +----------------------------------------------------------------------+ |
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// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | |
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// +----------------------------------------------------------------------+ |
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// | Authors: James Heinrich <info�getid3*org> | |
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// | Allan Hansen <ah�artemis*dk> | |
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// +----------------------------------------------------------------------+ |
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// | module.audio.mp3.php | |
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// | Module for analyzing MPEG Audio Layer 1,2,3 files. | |
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// | dependencies: none | |
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// +----------------------------------------------------------------------+ |
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// |
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// $Id: module.audio.mp3.php,v 1.10 2006/11/16 22:57:57 ah Exp $ |
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class getid3_mp3 extends getid3_handler |
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{ |
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// Number of frames to scan to determine if MPEG-audio sequence is valid. |
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// Lower this number to 5-20 for faster scanning |
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// Increase this number to 50+ for most accurate detection of valid VBR/CBR mpeg-audio streams |
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const VALID_CHECK_FRAMES = 35; |
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public function Analyze() { |
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$this->getAllMPEGInfo($this->getid3->fp, $this->getid3->info); |
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return true; |
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} |
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public function AnalyzeMPEGaudioInfo() { |
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$this->getOnlyMPEGaudioInfo($this->getid3->fp, $this->getid3->info, $this->getid3->info['avdataoffset'], false); |
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} |
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public function getAllMPEGInfo(&$fd, &$info) { |
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$this->getOnlyMPEGaudioInfo($fd, $info, 0 + $info['avdataoffset']); |
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if (isset($info['mpeg']['audio']['bitrate_mode'])) { |
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$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']); |
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} |
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if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0)))) { |
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$synch_offset_warning = 'Unknown data before synch '; |
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if (isset($info['id3v2']['headerlength'])) { |
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$synch_offset_warning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, '; |
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} else { |
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$synch_offset_warning .= '(should be at beginning of file, '; |
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} |
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$synch_offset_warning .= 'synch detected at '.$info['avdataoffset'].')'; |
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if ($info['audio']['bitrate_mode'] == 'cbr') { |
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if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) { |
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$synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.'; |
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$info['audio']['codec'] = 'LAME'; |
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$current_data_lame_version_string = 'LAME3.'; |
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} elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) { |
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$synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.'; |
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$info['audio']['codec'] = 'LAME'; |
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$current_data_lame_version_string = 'LAME3.'; |
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} |
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} |
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$this->getid3->warning($synch_offset_warning); |
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} |
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if (isset($info['mpeg']['audio']['LAME'])) { |
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$info['audio']['codec'] = 'LAME'; |
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if (!empty($info['mpeg']['audio']['LAME']['long_version'])) { |
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$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00"); |
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} elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) { |
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$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00"); |
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} |
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} |
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$current_data_lame_version_string = (!empty($current_data_lame_version_string) ? $current_data_lame_version_string : @$info['audio']['encoder']); |
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if (!empty($current_data_lame_version_string) && (substr($current_data_lame_version_string, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($current_data_lame_version_string, -1))) { |
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// a version number of LAME that does not end with a number like "LAME3.92" |
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// or with a closing parenthesis like "LAME3.88 (alpha)" |
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// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92) |
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// not sure what the actual last frame length will be, but will be less than or equal to 1441 |
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$possibly_longer_lame_version_frame_length = 1441; |
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// Not sure what version of LAME this is - look in padding of last frame for longer version string |
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$possible_lame_version_string_offset = $info['avdataend'] - $possibly_longer_lame_version_frame_length; |
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fseek($fd, $possible_lame_version_string_offset); |
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$possibly_longer_lame_version_data = fread($fd, $possibly_longer_lame_version_frame_length); |
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switch (substr($current_data_lame_version_string, -1)) { |
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case 'a': |
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case 'b': |
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// "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example |
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// need to trim off "a" to match longer string |
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$current_data_lame_version_string = substr($current_data_lame_version_string, 0, -1); |
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break; |
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} |
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if (($possibly_longer_lame_version_string = strstr($possibly_longer_lame_version_data, $current_data_lame_version_string)) !== false) { |
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if (substr($possibly_longer_lame_version_string, 0, strlen($current_data_lame_version_string)) == $current_data_lame_version_string) { |
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$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)" |
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if (strlen($possibly_longer_lame_version_new_string) > strlen(@$info['audio']['encoder'])) { |
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$info['audio']['encoder'] = $possibly_longer_lame_version_new_string; |
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} |
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} |
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} |
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} |
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if (!empty($info['audio']['encoder'])) { |
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$info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 "); |
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} |
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switch (@$info['mpeg']['audio']['layer']) { |
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case 1: |
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case 2: |
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$info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer']; |
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break; |
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} |
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if (@$info['fileformat'] == 'mp3') { |
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switch ($info['audio']['dataformat']) { |
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case 'mp1': |
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case 'mp2': |
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case 'mp3': |
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$info['fileformat'] = $info['audio']['dataformat']; |
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break; |
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default: |
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$this->getid3->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"'); |
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break; |
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} |
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} |
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$info['mime_type'] = 'audio/mpeg'; |
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$info['audio']['lossless'] = false; |
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// Calculate playtime |
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if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) { |
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$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate']; |
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} |
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$info['audio']['encoder_options'] = getid3_mp3::GuessEncoderOptions($info); |
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return true; |
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} |
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public static function GuessEncoderOptions(&$info) { |
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// shortcuts |
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if (!empty($info['mpeg']['audio'])) { |
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$thisfile_mpeg_audio = &$info['mpeg']['audio']; |
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if (!empty($thisfile_mpeg_audio['LAME'])) { |
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$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; |
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} |
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} |
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$encoder_options = ''; |
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static $named_preset_bitrates = array (16, 24, 40, 56, 112, 128, 160, 192, 256); |
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if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) { |
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$encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality']; |
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} elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $named_preset_bitrates))) { |
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$encoder_options = $thisfile_mpeg_audio_lame['preset_used']; |
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} elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) { |
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static $known_encoder_values = array (); |
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if (empty($known_encoder_values)) { |
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//$known_encoder_values[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name'; |
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$known_encoder_values[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92 |
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$known_encoder_values[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91 |
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$known_encoder_values[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95 |
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$known_encoder_values['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92 |
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$known_encoder_values['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91 |
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$known_encoder_values['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3 |
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$known_encoder_values['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92 |
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$known_encoder_values['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91 |
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$known_encoder_values['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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$known_encoder_values['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3 |
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$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 |
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$known_encoder_values['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3 |
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$known_encoder_values['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92 |
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$known_encoder_values['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91 |
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$known_encoder_values['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95 |
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$known_encoder_values['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3 |
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$known_encoder_values['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3 |
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208
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$known_encoder_values[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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$known_encoder_values[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1 |
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$known_encoder_values[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93 |
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$known_encoder_values[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95 |
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$known_encoder_values[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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213
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$known_encoder_values[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1 |
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$known_encoder_values[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93 |
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215
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$known_encoder_values[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95 |
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216
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$known_encoder_values[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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217
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$known_encoder_values[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1 |
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$known_encoder_values[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95 |
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$known_encoder_values[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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220
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$known_encoder_values[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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$known_encoder_values[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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$known_encoder_values[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1 |
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$known_encoder_values[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95 |
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$known_encoder_values[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1 |
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$known_encoder_values[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95 |
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$known_encoder_values[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14 |
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$known_encoder_values[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92 |
|
228
|
|
|
$known_encoder_values[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91 |
|
229
|
|
|
$known_encoder_values[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1 |
|
230
|
|
|
$known_encoder_values[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95 |
|
231
|
|
|
$known_encoder_values[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14 |
|
232
|
|
|
$known_encoder_values[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15 |
|
233
|
|
|
$known_encoder_values[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1 |
|
234
|
|
|
$known_encoder_values[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93 |
|
235
|
|
|
$known_encoder_values[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95 |
|
236
|
|
|
$known_encoder_values[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14 |
|
237
|
|
|
$known_encoder_values[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15 |
|
238
|
|
|
$known_encoder_values[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1 |
|
239
|
|
|
$known_encoder_values[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93 |
|
240
|
|
|
$known_encoder_values[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95 |
|
241
|
|
|
} |
|
242
|
|
|
|
|
243
|
|
|
if (isset($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']])) { |
|
244
|
|
|
|
|
245
|
|
|
$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']]; |
|
246
|
|
|
|
|
247
|
|
|
} 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']])) { |
|
248
|
|
|
|
|
249
|
|
|
$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']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; |
|
250
|
|
|
|
|
251
|
|
|
} elseif ($info['audio']['bitrate_mode'] == 'vbr') { |
|
252
|
|
|
|
|
253
|
|
|
// http://gabriel.mp3-tech.org/mp3infotag.html |
|
254
|
|
|
// int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h |
|
255
|
|
|
|
|
256
|
|
|
|
|
257
|
|
|
$lame_v_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10); |
|
258
|
|
|
$lame_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($lame_v_value * 10); |
|
259
|
|
|
$encoder_options = '-V'.$lame_v_value.' -q'.$lame_q_value; |
|
260
|
|
|
|
|
261
|
|
|
} elseif ($info['audio']['bitrate_mode'] == 'cbr') { |
|
262
|
|
|
|
|
263
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); |
|
264
|
|
|
|
|
265
|
|
|
} else { |
|
266
|
|
|
|
|
267
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']); |
|
268
|
|
|
|
|
269
|
|
|
} |
|
270
|
|
|
|
|
271
|
|
|
} elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { |
|
272
|
|
|
|
|
273
|
|
|
$encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr']; |
|
274
|
|
|
|
|
275
|
|
|
} elseif (!empty($info['audio']['bitrate'])) { |
|
276
|
|
|
|
|
277
|
|
|
if ($info['audio']['bitrate_mode'] == 'cbr') { |
|
278
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); |
|
279
|
|
|
} else { |
|
280
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']); |
|
281
|
|
|
} |
|
282
|
|
|
|
|
283
|
|
|
} |
|
284
|
|
|
if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { |
|
285
|
|
|
$encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min']; |
|
286
|
|
|
} |
|
287
|
|
|
|
|
288
|
|
|
if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) { |
|
|
|
|
|
|
289
|
|
|
$encoder_options .= ' --nogap'; |
|
290
|
|
|
} |
|
291
|
|
|
|
|
292
|
|
|
if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) { |
|
293
|
|
|
$exploded_options = explode(' ', $encoder_options, 4); |
|
294
|
|
|
if ($exploded_options[0] == '--r3mix') { |
|
295
|
|
|
$exploded_options[1] = 'r3mix'; |
|
296
|
|
|
} |
|
297
|
|
|
switch ($exploded_options[0]) { |
|
298
|
|
|
case '--preset': |
|
299
|
|
|
case '--alt-preset': |
|
300
|
|
|
case '--r3mix': |
|
301
|
|
|
if ($exploded_options[1] == 'fast') { |
|
302
|
|
|
$exploded_options[1] .= ' '.$exploded_options[2]; |
|
303
|
|
|
} |
|
304
|
|
|
switch ($exploded_options[1]) { |
|
305
|
|
|
case 'portable': |
|
306
|
|
|
case 'medium': |
|
307
|
|
|
case 'standard': |
|
308
|
|
|
case 'extreme': |
|
309
|
|
|
case 'insane': |
|
310
|
|
|
case 'fast portable': |
|
311
|
|
|
case 'fast medium': |
|
312
|
|
|
case 'fast standard': |
|
313
|
|
|
case 'fast extreme': |
|
314
|
|
|
case 'fast insane': |
|
315
|
|
|
case 'r3mix': |
|
316
|
|
|
static $expected_lowpass = array ( |
|
317
|
|
|
'insane|20500' => 20500, |
|
318
|
|
|
'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91 |
|
319
|
|
|
'medium|18000' => 18000, |
|
320
|
|
|
'fast medium|18000' => 18000, |
|
321
|
|
|
'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 |
|
322
|
|
|
'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 |
|
323
|
|
|
'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 |
|
324
|
|
|
'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 |
|
325
|
|
|
'standard|19000' => 19000, |
|
326
|
|
|
'fast standard|19000' => 19000, |
|
327
|
|
|
'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92 |
|
328
|
|
|
'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91 |
|
329
|
|
|
'r3mix|18000' => 18000, // 3.94, 3.95 |
|
330
|
|
|
); |
|
331
|
|
|
if (!isset($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))) { |
|
332
|
|
|
$encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency']; |
|
333
|
|
|
} |
|
334
|
|
|
break; |
|
335
|
|
|
|
|
336
|
|
|
default: |
|
337
|
|
|
break; |
|
338
|
|
|
} |
|
339
|
|
|
break; |
|
340
|
|
|
} |
|
341
|
|
|
} |
|
342
|
|
|
|
|
343
|
|
|
if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { |
|
344
|
|
|
if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) { |
|
345
|
|
|
$encoder_options .= ' --resample 44100'; |
|
346
|
|
|
} elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) { |
|
347
|
|
|
$encoder_options .= ' --resample 48000'; |
|
348
|
|
|
} elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) { |
|
349
|
|
|
switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) { |
|
350
|
|
|
case 0: // <= 32000 |
|
351
|
|
|
// may or may not be same as source frequency - ignore |
|
352
|
|
|
break; |
|
353
|
|
|
case 1: // 44100 |
|
354
|
|
|
case 2: // 48000 |
|
355
|
|
|
case 3: // 48000+ |
|
356
|
|
|
$exploded_options = explode(' ', $encoder_options, 4); |
|
357
|
|
|
switch ($exploded_options[0]) { |
|
358
|
|
|
case '--preset': |
|
359
|
|
|
case '--alt-preset': |
|
360
|
|
|
switch ($exploded_options[1]) { |
|
361
|
|
|
case 'fast': |
|
362
|
|
|
case 'portable': |
|
363
|
|
|
case 'medium': |
|
364
|
|
|
case 'standard': |
|
365
|
|
|
case 'extreme': |
|
366
|
|
|
case 'insane': |
|
367
|
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; |
|
368
|
|
|
break; |
|
369
|
|
|
|
|
370
|
|
|
default: |
|
371
|
|
|
static $expected_resampled_rate = array ( |
|
372
|
|
|
'phon+/lw/mw-eu/sw|16000' => 16000, |
|
373
|
|
|
'mw-us|24000' => 24000, // 3.95 |
|
374
|
|
|
'mw-us|32000' => 32000, // 3.93 |
|
375
|
|
|
'mw-us|16000' => 16000, // 3.92 |
|
376
|
|
|
'phone|16000' => 16000, |
|
377
|
|
|
'phone|11025' => 11025, // 3.94a15 |
|
378
|
|
|
'radio|32000' => 32000, // 3.94a15 |
|
379
|
|
|
'fm/radio|32000' => 32000, // 3.92 |
|
380
|
|
|
'fm|32000' => 32000, // 3.90 |
|
381
|
|
|
'voice|32000' => 32000); |
|
382
|
|
|
if (!isset($expected_resampled_rate[$exploded_options[1].'|'.$thisfile_mpeg_audio['sample_rate']])) { |
|
383
|
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; |
|
384
|
|
|
} |
|
385
|
|
|
break; |
|
386
|
|
|
} |
|
387
|
|
|
break; |
|
388
|
|
|
|
|
389
|
|
|
case '--r3mix': |
|
390
|
|
|
default: |
|
391
|
|
|
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; |
|
392
|
|
|
break; |
|
393
|
|
|
} |
|
394
|
|
|
break; |
|
395
|
|
|
} |
|
396
|
|
|
} |
|
397
|
|
|
} |
|
398
|
|
|
if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) { |
|
399
|
|
|
//$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); |
|
400
|
|
|
$encoder_options = strtoupper($info['audio']['bitrate_mode']); |
|
401
|
|
|
} |
|
402
|
|
|
|
|
403
|
|
|
return $encoder_options; |
|
404
|
|
|
} |
|
405
|
|
|
|
|
406
|
|
|
|
|
407
|
|
|
|
|
408
|
|
|
public function decodeMPEGaudioHeader($fd, $offset, &$info, $recursive_search=true, $scan_as_cbr=false, $fast_mpeg_header_scan=false) { |
|
409
|
|
|
|
|
410
|
|
|
static $mpeg_audio_version_lookup; |
|
411
|
|
|
static $mpeg_audio_layer_lookup; |
|
412
|
|
|
static $mpeg_audio_bitrate_lookup; |
|
413
|
|
|
static $mpeg_audio_frequency_lookup; |
|
414
|
|
|
static $mpeg_audio_channel_mode_lookup; |
|
415
|
|
|
static $mpeg_audio_mode_extension_lookup; |
|
416
|
|
|
static $mpeg_audio_emphasis_lookup; |
|
417
|
|
|
if (empty($mpeg_audio_version_lookup)) { |
|
418
|
|
|
$mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); |
|
419
|
|
|
$mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); |
|
420
|
|
|
$mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); |
|
421
|
|
|
$mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray(); |
|
422
|
|
|
$mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray(); |
|
423
|
|
|
$mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray(); |
|
424
|
|
|
$mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray(); |
|
425
|
|
|
} |
|
426
|
|
|
|
|
427
|
|
|
if ($offset >= $info['avdataend']) { |
|
428
|
|
|
|
|
429
|
|
|
// non-fatal error: 'end of file encounter looking for MPEG synch' |
|
430
|
|
|
return; |
|
431
|
|
|
|
|
432
|
|
|
} |
|
433
|
|
|
fseek($fd, $offset, SEEK_SET); |
|
434
|
|
|
$header_string = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data |
|
435
|
|
|
|
|
436
|
|
|
// MP3 audio frame structure: |
|
437
|
|
|
// $aa $aa $aa $aa [$bb $bb] $cc... |
|
438
|
|
|
// where $aa..$aa is the four-byte mpeg-audio header (below) |
|
439
|
|
|
// $bb $bb is the optional 2-byte CRC |
|
440
|
|
|
// and $cc... is the audio data |
|
441
|
|
|
|
|
442
|
|
|
$head4 = substr($header_string, 0, 4); |
|
443
|
|
|
|
|
444
|
|
|
if (isset($mpeg_audio_header_decode_cache[$head4])) { |
|
|
|
|
|
|
445
|
|
|
$mpeg_header_raw_array= $mpeg_audio_header_decode_cache[$head4]; |
|
446
|
|
|
} else { |
|
447
|
|
|
$mpeg_header_raw_array = getid3_mp3::MPEGaudioHeaderDecode($head4); |
|
448
|
|
|
$mpeg_audio_header_decode_cache[$head4] = $mpeg_header_raw_array; |
|
|
|
|
|
|
449
|
|
|
} |
|
450
|
|
|
|
|
451
|
|
|
// Not in cache |
|
452
|
|
|
if (!isset($mpeg_audio_header_valid_cache[$head4])) { |
|
|
|
|
|
|
453
|
|
|
$mpeg_audio_header_valid_cache[$head4] = getid3_mp3::MPEGaudioHeaderValid($mpeg_header_raw_array, false, false); |
|
|
|
|
|
|
454
|
|
|
} |
|
455
|
|
|
|
|
456
|
|
|
// shortcut |
|
457
|
|
|
if (!isset($info['mpeg']['audio'])) { |
|
458
|
|
|
$info['mpeg']['audio'] = array (); |
|
459
|
|
|
} |
|
460
|
|
|
$thisfile_mpeg_audio = &$info['mpeg']['audio']; |
|
461
|
|
|
|
|
462
|
|
|
|
|
463
|
|
|
if ($mpeg_audio_header_valid_cache[$head4]) { |
|
464
|
|
|
$thisfile_mpeg_audio['raw'] = $mpeg_header_raw_array; |
|
465
|
|
|
} else { |
|
466
|
|
|
|
|
467
|
|
|
// non-fatal error: Invalid MPEG audio header at offset $offset |
|
468
|
|
|
return; |
|
469
|
|
|
} |
|
470
|
|
|
|
|
471
|
|
|
if (!$fast_mpeg_header_scan) { |
|
472
|
|
|
|
|
473
|
|
|
$thisfile_mpeg_audio['version'] = $mpeg_audio_version_lookup[$thisfile_mpeg_audio['raw']['version']]; |
|
474
|
|
|
$thisfile_mpeg_audio['layer'] = $mpeg_audio_layer_lookup[$thisfile_mpeg_audio['raw']['layer']]; |
|
475
|
|
|
|
|
476
|
|
|
$thisfile_mpeg_audio['channelmode'] = $mpeg_audio_channel_mode_lookup[$thisfile_mpeg_audio['raw']['channelmode']]; |
|
477
|
|
|
$thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2); |
|
478
|
|
|
$thisfile_mpeg_audio['sample_rate'] = $mpeg_audio_frequency_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']]; |
|
479
|
|
|
$thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection']; |
|
480
|
|
|
$thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private']; |
|
481
|
|
|
$thisfile_mpeg_audio['modeextension'] = $mpeg_audio_mode_extension_lookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']]; |
|
482
|
|
|
$thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright']; |
|
483
|
|
|
$thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original']; |
|
484
|
|
|
$thisfile_mpeg_audio['emphasis'] = $mpeg_audio_emphasis_lookup[$thisfile_mpeg_audio['raw']['emphasis']]; |
|
485
|
|
|
|
|
486
|
|
|
$info['audio']['channels'] = $thisfile_mpeg_audio['channels']; |
|
487
|
|
|
$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; |
|
488
|
|
|
|
|
489
|
|
|
if ($thisfile_mpeg_audio['protection']) { |
|
490
|
|
|
$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($header_string, 4, 2)); |
|
491
|
|
|
} |
|
492
|
|
|
|
|
493
|
|
|
} |
|
494
|
|
|
|
|
495
|
|
|
if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) { |
|
496
|
|
|
// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 |
|
497
|
|
|
$this->getid3->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1'); |
|
498
|
|
|
$thisfile_mpeg_audio['raw']['bitrate'] = 0; |
|
499
|
|
|
} |
|
500
|
|
|
$thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding']; |
|
501
|
|
|
$thisfile_mpeg_audio['bitrate'] = $mpeg_audio_bitrate_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; |
|
502
|
|
|
|
|
503
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) { |
|
504
|
|
|
// only skip multiple frame check if free-format bitstream found at beginning of file |
|
505
|
|
|
// otherwise is quite possibly simply corrupted data |
|
506
|
|
|
$recursive_search = false; |
|
507
|
|
|
} |
|
508
|
|
|
|
|
509
|
|
|
// For Layer 2 there are some combinations of bitrate and mode which are not allowed. |
|
510
|
|
|
if (!$fast_mpeg_header_scan && ($thisfile_mpeg_audio['layer'] == '2')) { |
|
511
|
|
|
|
|
512
|
|
|
$info['audio']['dataformat'] = 'mp2'; |
|
513
|
|
|
switch ($thisfile_mpeg_audio['channelmode']) { |
|
514
|
|
|
|
|
515
|
|
|
case 'mono': |
|
516
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { |
|
517
|
|
|
// these are ok |
|
518
|
|
|
} else { |
|
519
|
|
|
|
|
520
|
|
|
// non-fatal error: bitrate not allowed in Layer 2/mono |
|
521
|
|
|
return; |
|
522
|
|
|
} |
|
523
|
|
|
break; |
|
524
|
|
|
|
|
525
|
|
|
case 'stereo': |
|
526
|
|
|
case 'joint stereo': |
|
527
|
|
|
case 'dual channel': |
|
528
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { |
|
529
|
|
|
// these are ok |
|
530
|
|
|
} else { |
|
531
|
|
|
|
|
532
|
|
|
// non-fatal error: bitrate not allowed in Layer 2/stereo/joint stereo/dual channel |
|
533
|
|
|
return; |
|
534
|
|
|
} |
|
535
|
|
|
break; |
|
536
|
|
|
|
|
537
|
|
|
} |
|
538
|
|
|
|
|
539
|
|
|
} |
|
540
|
|
|
|
|
541
|
|
|
|
|
542
|
|
|
if ($info['audio']['sample_rate'] > 0) { |
|
543
|
|
|
$thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']); |
|
544
|
|
|
} |
|
545
|
|
|
|
|
546
|
|
|
$next_frame_test_offset = $offset + 1; |
|
547
|
|
|
if ($thisfile_mpeg_audio['bitrate'] != 'free') { |
|
548
|
|
|
|
|
549
|
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; |
|
550
|
|
|
|
|
551
|
|
|
if (isset($thisfile_mpeg_audio['framelength'])) { |
|
552
|
|
|
$next_frame_test_offset = $offset + $thisfile_mpeg_audio['framelength']; |
|
553
|
|
|
} else { |
|
554
|
|
|
|
|
555
|
|
|
// non-fatal error: Frame at offset('.$offset.') is has an invalid frame length. |
|
556
|
|
|
return; |
|
557
|
|
|
} |
|
558
|
|
|
|
|
559
|
|
|
} |
|
560
|
|
|
|
|
561
|
|
|
$expected_number_of_audio_bytes = 0; |
|
562
|
|
|
|
|
563
|
|
|
//////////////////////////////////////////////////////////////////////////////////// |
|
564
|
|
|
// Variable-bitrate headers |
|
565
|
|
|
|
|
566
|
|
|
if (substr($header_string, 4 + 32, 4) == 'VBRI') { |
|
567
|
|
|
// Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) |
|
568
|
|
|
// specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html |
|
569
|
|
|
|
|
570
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
|
571
|
|
|
$thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; |
|
572
|
|
|
$info['audio']['codec'] = 'Fraunhofer'; |
|
573
|
|
|
|
|
574
|
|
|
$side_info_data = substr($header_string, 4 + 2, 32); |
|
|
|
|
|
|
575
|
|
|
|
|
576
|
|
|
$fraunhofer_vbr_offset = 36; |
|
577
|
|
|
|
|
578
|
|
|
$thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 4, 2)); // VbriVersion |
|
579
|
|
|
$thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 6, 2)); // VbriDelay |
|
580
|
|
|
$thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 8, 2)); // VbriQuality |
|
581
|
|
|
$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 10, 4)); // VbriStreamBytes |
|
582
|
|
|
$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 14, 4)); // VbriStreamFrames |
|
583
|
|
|
$thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 18, 2)); // VbriTableSize |
|
584
|
|
|
$thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 20, 2)); // VbriTableScale |
|
585
|
|
|
$thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 22, 2)); // VbriEntryBytes |
|
586
|
|
|
$thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 24, 2)); // VbriEntryFrames |
|
587
|
|
|
|
|
588
|
|
|
$expected_number_of_audio_bytes = $thisfile_mpeg_audio['VBR_bytes']; |
|
589
|
|
|
|
|
590
|
|
|
$previous_byte_offset = $offset; |
|
591
|
|
|
for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { |
|
592
|
|
|
$fraunhofer_offset_n = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset, $thisfile_mpeg_audio['VBR_entry_bytes'])); |
|
593
|
|
|
$fraunhofer_vbr_offset += $thisfile_mpeg_audio['VBR_entry_bytes']; |
|
594
|
|
|
$thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']); |
|
595
|
|
|
$thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']) + $previous_byte_offset; |
|
596
|
|
|
$previous_byte_offset += $fraunhofer_offset_n; |
|
597
|
|
|
} |
|
598
|
|
|
|
|
599
|
|
|
|
|
600
|
|
|
} else { |
|
601
|
|
|
|
|
602
|
|
|
// Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36) |
|
603
|
|
|
// depending on MPEG layer and number of channels |
|
604
|
|
|
|
|
605
|
|
|
$vbr_id_offset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); |
|
606
|
|
|
$side_info_data = substr($header_string, 4 + 2, $vbr_id_offset - 4); |
|
607
|
|
|
|
|
608
|
|
|
if ((substr($header_string, $vbr_id_offset, strlen('Xing')) == 'Xing') || (substr($header_string, $vbr_id_offset, strlen('Info')) == 'Info')) { |
|
609
|
|
|
// 'Xing' is traditional Xing VBR frame |
|
610
|
|
|
// 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) |
|
611
|
|
|
// 'Info' *can* legally be used to specify a VBR file as well, however. |
|
612
|
|
|
|
|
613
|
|
|
// http://www.multiweb.cz/twoinches/MP3inside.htm |
|
614
|
|
|
//00..03 = "Xing" or "Info" |
|
615
|
|
|
//04..07 = Flags: |
|
616
|
|
|
// 0x01 Frames Flag set if value for number of frames in file is stored |
|
617
|
|
|
// 0x02 Bytes Flag set if value for filesize in bytes is stored |
|
618
|
|
|
// 0x04 TOC Flag set if values for TOC are stored |
|
619
|
|
|
// 0x08 VBR Scale Flag set if values for VBR scale is stored |
|
620
|
|
|
//08..11 Frames: Number of frames in file (including the first Xing/Info one) |
|
621
|
|
|
//12..15 Bytes: File length in Bytes |
|
622
|
|
|
//16..115 TOC (Table of Contents): |
|
623
|
|
|
// Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. |
|
624
|
|
|
// Each Byte has a value according this formula: |
|
625
|
|
|
// (TOC[i] / 256) * fileLenInBytes |
|
626
|
|
|
// 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: |
|
627
|
|
|
// TOC[(60/240)*100] = TOC[25] |
|
628
|
|
|
// and corresponding Byte in file is then approximately at: |
|
629
|
|
|
// (TOC[25]/256) * 5000000 |
|
630
|
|
|
//116..119 VBR Scale |
|
631
|
|
|
|
|
632
|
|
|
|
|
633
|
|
|
// should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME |
|
634
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
|
635
|
|
|
$thisfile_mpeg_audio['VBR_method'] = 'Xing'; |
|
636
|
|
|
|
|
637
|
|
|
$thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 4, 4)); |
|
638
|
|
|
|
|
639
|
|
|
$thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); |
|
640
|
|
|
$thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); |
|
641
|
|
|
$thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); |
|
642
|
|
|
$thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); |
|
643
|
|
|
|
|
644
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['frames']) { |
|
645
|
|
|
$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 8, 4)); |
|
646
|
|
|
} |
|
647
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['bytes']) { |
|
648
|
|
|
$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 12, 4)); |
|
649
|
|
|
} |
|
650
|
|
|
|
|
651
|
|
|
if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { |
|
652
|
|
|
|
|
653
|
|
|
$frame_lengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']; |
|
654
|
|
|
|
|
655
|
|
|
if ($thisfile_mpeg_audio['layer'] == '1') { |
|
656
|
|
|
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 |
|
657
|
|
|
$info['audio']['bitrate'] = ($frame_lengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12; |
|
658
|
|
|
} else { |
|
659
|
|
|
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 |
|
660
|
|
|
$info['audio']['bitrate'] = $frame_lengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144; |
|
661
|
|
|
} |
|
662
|
|
|
$thisfile_mpeg_audio['framelength'] = floor($frame_lengthfloat); |
|
663
|
|
|
} |
|
664
|
|
|
|
|
665
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['toc']) { |
|
666
|
|
|
$lame_toc_data = substr($header_string, $vbr_id_offset + 16, 100); |
|
667
|
|
|
for ($i = 0; $i < 100; $i++) { |
|
668
|
|
|
$thisfile_mpeg_audio['toc'][$i] = ord($lame_toc_data{$i}); |
|
669
|
|
|
} |
|
670
|
|
|
} |
|
671
|
|
|
if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { |
|
672
|
|
|
$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 116, 4)); |
|
673
|
|
|
} |
|
674
|
|
|
|
|
675
|
|
|
|
|
676
|
|
|
// http://gabriel.mp3-tech.org/mp3infotag.html |
|
677
|
|
|
if (substr($header_string, $vbr_id_offset + 120, 4) == 'LAME') { |
|
678
|
|
|
|
|
679
|
|
|
// shortcut |
|
680
|
|
|
$thisfile_mpeg_audio['LAME'] = array (); |
|
681
|
|
|
$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; |
|
682
|
|
|
|
|
683
|
|
|
|
|
684
|
|
|
$thisfile_mpeg_audio_lame['long_version'] = substr($header_string, $vbr_id_offset + 120, 20); |
|
685
|
|
|
$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9); |
|
686
|
|
|
|
|
687
|
|
|
if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') { |
|
688
|
|
|
|
|
689
|
|
|
// extra 11 chars are not part of version string when LAMEtag present |
|
690
|
|
|
unset($thisfile_mpeg_audio_lame['long_version']); |
|
691
|
|
|
|
|
692
|
|
|
// It the LAME tag was only introduced in LAME v3.90 |
|
693
|
|
|
// http://www.hydrogenaudio.org/?act=ST&f=15&t=9933 |
|
694
|
|
|
|
|
695
|
|
|
// Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html |
|
696
|
|
|
// are assuming a 'Xing' identifier offset of 0x24, which is the case for |
|
697
|
|
|
// MPEG-1 non-mono, but not for other combinations |
|
698
|
|
|
$lame_tag_offset_contant = $vbr_id_offset - 0x24; |
|
699
|
|
|
|
|
700
|
|
|
// shortcuts |
|
701
|
|
|
$thisfile_mpeg_audio_lame['RGAD'] = array ('track'=>array(), 'album'=>array()); |
|
702
|
|
|
$thisfile_mpeg_audio_lame_rgad = &$thisfile_mpeg_audio_lame['RGAD']; |
|
703
|
|
|
$thisfile_mpeg_audio_lame_rgad_track = &$thisfile_mpeg_audio_lame_rgad['track']; |
|
704
|
|
|
$thisfile_mpeg_audio_lame_rgad_album = &$thisfile_mpeg_audio_lame_rgad['album']; |
|
705
|
|
|
$thisfile_mpeg_audio_lame['raw'] = array (); |
|
706
|
|
|
$thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw']; |
|
707
|
|
|
|
|
708
|
|
|
// byte $9B VBR Quality |
|
709
|
|
|
// This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications. |
|
710
|
|
|
// Actually overwrites original Xing bytes |
|
711
|
|
|
unset($thisfile_mpeg_audio['VBR_scale']); |
|
712
|
|
|
$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0x9B, 1)); |
|
713
|
|
|
|
|
714
|
|
|
// bytes $9C-$A4 Encoder short VersionString |
|
715
|
|
|
$thisfile_mpeg_audio_lame['short_version'] = substr($header_string, $lame_tag_offset_contant + 0x9C, 9); |
|
716
|
|
|
|
|
717
|
|
|
// byte $A5 Info Tag revision + VBR method |
|
718
|
|
|
$lame_tagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA5, 1)); |
|
719
|
|
|
|
|
720
|
|
|
$thisfile_mpeg_audio_lame['tag_revision'] = ($lame_tagRevisionVBRmethod & 0xF0) >> 4; |
|
721
|
|
|
$thisfile_mpeg_audio_lame_raw['vbr_method'] = $lame_tagRevisionVBRmethod & 0x0F; |
|
722
|
|
|
$thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']); |
|
723
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr' |
|
724
|
|
|
|
|
725
|
|
|
// byte $A6 Lowpass filter value |
|
726
|
|
|
$thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA6, 1)) * 100; |
|
727
|
|
|
|
|
728
|
|
|
// bytes $A7-$AE Replay Gain |
|
729
|
|
|
// http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html |
|
730
|
|
|
// bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" |
|
731
|
|
|
if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') { |
|
732
|
|
|
// LAME 3.94a16 and later - 9.23 fixed point |
|
733
|
|
|
// ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375 |
|
734
|
|
|
$thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA7, 4))) / 8388608); |
|
735
|
|
|
} else { |
|
736
|
|
|
// LAME 3.94a15 and earlier - 32-bit floating point |
|
737
|
|
|
// Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15 |
|
738
|
|
|
$thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($header_string, $lame_tag_offset_contant + 0xA7, 4)); |
|
739
|
|
|
} |
|
740
|
|
|
if ($thisfile_mpeg_audio_lame_rgad['peak_amplitude'] == 0) { |
|
741
|
|
|
unset($thisfile_mpeg_audio_lame_rgad['peak_amplitude']); |
|
742
|
|
|
} else { |
|
743
|
|
|
$thisfile_mpeg_audio_lame_rgad['peak_db'] = 20 * log10($thisfile_mpeg_audio_lame_rgad['peak_amplitude']); |
|
744
|
|
|
} |
|
745
|
|
|
|
|
746
|
|
|
$thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAB, 2)); |
|
747
|
|
|
$thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAD, 2)); |
|
748
|
|
|
|
|
749
|
|
|
|
|
750
|
|
|
if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) { |
|
751
|
|
|
|
|
752
|
|
|
$thisfile_mpeg_audio_lame_rgad_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13; |
|
753
|
|
|
$thisfile_mpeg_audio_lame_rgad_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10; |
|
754
|
|
|
$thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9; |
|
755
|
|
|
$thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF; |
|
756
|
|
|
$thisfile_mpeg_audio_lame_rgad_track['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['name']); |
|
757
|
|
|
$thisfile_mpeg_audio_lame_rgad_track['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['originator']); |
|
758
|
|
|
$thisfile_mpeg_audio_lame_rgad_track['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit']); |
|
759
|
|
|
|
|
760
|
|
|
if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) { |
|
761
|
|
|
$info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude']; |
|
762
|
|
|
} |
|
763
|
|
|
$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_rgad_track['originator']; |
|
764
|
|
|
$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_track['gain_db']; |
|
765
|
|
|
} else { |
|
766
|
|
|
unset($thisfile_mpeg_audio_lame_rgad['track']); |
|
767
|
|
|
} |
|
768
|
|
|
if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) { |
|
769
|
|
|
|
|
770
|
|
|
$thisfile_mpeg_audio_lame_rgad_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; |
|
771
|
|
|
$thisfile_mpeg_audio_lame_rgad_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; |
|
772
|
|
|
$thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; |
|
773
|
|
|
$thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; |
|
774
|
|
|
$thisfile_mpeg_audio_lame_rgad_album['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['name']); |
|
775
|
|
|
$thisfile_mpeg_audio_lame_rgad_album['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['originator']); |
|
776
|
|
|
$thisfile_mpeg_audio_lame_rgad_album['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit']); |
|
777
|
|
|
|
|
778
|
|
|
if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) { |
|
779
|
|
|
$info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude']; |
|
780
|
|
|
} |
|
781
|
|
|
$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_rgad_album['originator']; |
|
782
|
|
|
$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_album['gain_db']; |
|
783
|
|
|
} else { |
|
784
|
|
|
unset($thisfile_mpeg_audio_lame_rgad['album']); |
|
785
|
|
|
} |
|
786
|
|
|
if (empty($thisfile_mpeg_audio_lame_rgad)) { |
|
787
|
|
|
unset($thisfile_mpeg_audio_lame['RGAD']); |
|
788
|
|
|
} |
|
789
|
|
|
|
|
790
|
|
|
|
|
791
|
|
|
// byte $AF Encoding flags + ATH Type |
|
792
|
|
|
$encoding_flags_ath_type = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAF, 1)); |
|
793
|
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($encoding_flags_ath_type & 0x10); |
|
794
|
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($encoding_flags_ath_type & 0x20); |
|
795
|
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($encoding_flags_ath_type & 0x40); |
|
796
|
|
|
$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($encoding_flags_ath_type & 0x80); |
|
797
|
|
|
$thisfile_mpeg_audio_lame['ath_type'] = $encoding_flags_ath_type & 0x0F; |
|
798
|
|
|
|
|
799
|
|
|
// byte $B0 if ABR {specified bitrate} else {minimal bitrate} |
|
800
|
|
|
$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB0, 1)); |
|
801
|
|
|
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR) |
|
802
|
|
|
$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; |
|
803
|
|
|
} elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR) |
|
804
|
|
|
// ignore |
|
805
|
|
|
} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate |
|
806
|
|
|
$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; |
|
807
|
|
|
} |
|
808
|
|
|
|
|
809
|
|
|
// bytes $B1-$B3 Encoder delays |
|
810
|
|
|
$encoder_delays = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB1, 3)); |
|
811
|
|
|
$thisfile_mpeg_audio_lame['encoder_delay'] = ($encoder_delays & 0xFFF000) >> 12; |
|
812
|
|
|
$thisfile_mpeg_audio_lame['end_padding'] = $encoder_delays & 0x000FFF; |
|
813
|
|
|
|
|
814
|
|
|
// byte $B4 Misc |
|
815
|
|
|
$misc_byte = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB4, 1)); |
|
816
|
|
|
$thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($misc_byte & 0x03); |
|
817
|
|
|
$thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($misc_byte & 0x1C) >> 2; |
|
818
|
|
|
$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($misc_byte & 0x20) >> 5; |
|
819
|
|
|
$thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($misc_byte & 0xC0) >> 6; |
|
820
|
|
|
$thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping']; |
|
821
|
|
|
$thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); |
|
822
|
|
|
$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality']; |
|
823
|
|
|
$thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']); |
|
824
|
|
|
|
|
825
|
|
|
// byte $B5 MP3 Gain |
|
826
|
|
|
$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB5, 1), false, true); |
|
827
|
|
|
$thisfile_mpeg_audio_lame['mp3_gain_db'] = (20 * log10(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain']; |
|
828
|
|
|
$thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6)); |
|
829
|
|
|
|
|
830
|
|
|
// bytes $B6-$B7 Preset and surround info |
|
831
|
|
|
$PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB6, 2)); |
|
832
|
|
|
// Reserved = ($PresetSurroundBytes & 0xC000); |
|
833
|
|
|
$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800); |
|
834
|
|
|
$thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); |
|
835
|
|
|
$thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); |
|
836
|
|
|
$thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); |
|
837
|
|
|
if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { |
|
838
|
|
|
$this->getid3->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to [email protected]'); |
|
839
|
|
|
} |
|
840
|
|
|
if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) { |
|
841
|
|
|
// this may change if 3.90.4 ever comes out |
|
842
|
|
|
$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3'; |
|
843
|
|
|
} |
|
844
|
|
|
|
|
845
|
|
|
// bytes $B8-$BB MusicLength |
|
846
|
|
|
$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB8, 4)); |
|
847
|
|
|
$expected_number_of_audio_bytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); |
|
848
|
|
|
|
|
849
|
|
|
// bytes $BC-$BD MusicCRC |
|
850
|
|
|
$thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBC, 2)); |
|
851
|
|
|
|
|
852
|
|
|
// bytes $BE-$BF CRC-16 of Info Tag |
|
853
|
|
|
$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBE, 2)); |
|
854
|
|
|
|
|
855
|
|
|
|
|
856
|
|
|
// LAME CBR |
|
857
|
|
|
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { |
|
858
|
|
|
|
|
859
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
|
860
|
|
|
$thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); |
|
861
|
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; |
|
862
|
|
|
|
|
863
|
|
|
} |
|
864
|
|
|
|
|
865
|
|
|
} |
|
866
|
|
|
} |
|
867
|
|
|
|
|
868
|
|
|
} else { |
|
869
|
|
|
|
|
870
|
|
|
// not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) |
|
871
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
|
872
|
|
|
if ($recursive_search) { |
|
873
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
|
874
|
|
|
if (getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, true)) { |
|
875
|
|
|
$recursive_search = false; |
|
876
|
|
|
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
|
877
|
|
|
} |
|
878
|
|
|
if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { |
|
879
|
|
|
$this->getid3->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'); |
|
880
|
|
|
} |
|
881
|
|
|
} |
|
882
|
|
|
|
|
883
|
|
|
} |
|
884
|
|
|
|
|
885
|
|
|
} |
|
886
|
|
|
|
|
887
|
|
|
if (($expected_number_of_audio_bytes > 0) && ($expected_number_of_audio_bytes != ($info['avdataend'] - $info['avdataoffset']))) { |
|
888
|
|
|
if ($expected_number_of_audio_bytes > ($info['avdataend'] - $info['avdataoffset'])) { |
|
889
|
|
|
if (($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) { |
|
890
|
|
|
$this->getid3->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'); |
|
891
|
|
|
} else { |
|
892
|
|
|
$this->getid3->warning('Probable truncated file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)'); |
|
893
|
|
|
} |
|
894
|
|
|
} else { |
|
895
|
|
|
if ((($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes) == 1) { |
|
896
|
|
|
$info['avdataend']--; |
|
897
|
|
|
} else { |
|
898
|
|
|
$this->getid3->warning('Too much data in file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes).' bytes too many)'); |
|
899
|
|
|
} |
|
900
|
|
|
} |
|
901
|
|
|
} |
|
902
|
|
|
|
|
903
|
|
|
if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) { |
|
904
|
|
|
if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { |
|
905
|
|
|
$frame_byte_length = getid3_mp3::FreeFormatFrameLength($fd, $offset, $info, true); |
|
906
|
|
|
if ($frame_byte_length > 0) { |
|
907
|
|
|
$thisfile_mpeg_audio['framelength'] = $frame_byte_length; |
|
908
|
|
|
if ($thisfile_mpeg_audio['layer'] == '1') { |
|
909
|
|
|
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 |
|
910
|
|
|
$info['audio']['bitrate'] = ((($frame_byte_length / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; |
|
911
|
|
|
} else { |
|
912
|
|
|
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 |
|
913
|
|
|
$info['audio']['bitrate'] = (($frame_byte_length - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; |
|
914
|
|
|
} |
|
915
|
|
|
} else { |
|
916
|
|
|
|
|
917
|
|
|
// non-fatal error: Error calculating frame length of free-format MP3 without Xing/LAME header. |
|
918
|
|
|
return; |
|
919
|
|
|
} |
|
920
|
|
|
} |
|
921
|
|
|
} |
|
922
|
|
|
|
|
923
|
|
|
if (@$thisfile_mpeg_audio['VBR_frames']) { |
|
924
|
|
|
switch ($thisfile_mpeg_audio['bitrate_mode']) { |
|
925
|
|
|
case 'vbr': |
|
926
|
|
|
case 'abr': |
|
927
|
|
|
if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) { |
|
928
|
|
|
$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 384); |
|
929
|
|
|
} elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) { |
|
930
|
|
|
$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 576); |
|
931
|
|
|
} else { |
|
932
|
|
|
$thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 1152); |
|
933
|
|
|
} |
|
934
|
|
|
if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { |
|
935
|
|
|
$info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; |
|
936
|
|
|
$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion |
|
937
|
|
|
} |
|
938
|
|
|
break; |
|
939
|
|
|
} |
|
940
|
|
|
} |
|
941
|
|
|
|
|
942
|
|
|
// End variable-bitrate headers |
|
943
|
|
|
//////////////////////////////////////////////////////////////////////////////////// |
|
944
|
|
|
|
|
945
|
|
|
if ($recursive_search) { |
|
946
|
|
|
|
|
947
|
|
|
if (!getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, $scan_as_cbr)) { |
|
|
|
|
|
|
948
|
|
|
return false; |
|
949
|
|
|
} |
|
950
|
|
|
|
|
951
|
|
|
} |
|
952
|
|
|
|
|
953
|
|
|
return true; |
|
954
|
|
|
} |
|
955
|
|
|
|
|
956
|
|
|
|
|
957
|
|
|
|
|
958
|
|
|
public function RecursiveFrameScanning(&$fd, &$info, &$offset, &$next_frame_test_offset, $scan_as_cbr) { |
|
|
|
|
|
|
959
|
|
|
for ($i = 0; $i < getid3_mp3::VALID_CHECK_FRAMES; $i++) { |
|
960
|
|
|
// check next getid3_mp3::VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch |
|
961
|
|
|
if (($next_frame_test_offset + 4) >= $info['avdataend']) { |
|
962
|
|
|
// end of file |
|
963
|
|
|
return true; |
|
964
|
|
|
} |
|
965
|
|
|
|
|
966
|
|
|
$next_frame_test_array = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']); |
|
967
|
|
|
if ($this->decodeMPEGaudioHeader($fd, $next_frame_test_offset, $next_frame_test_array, false)) { |
|
968
|
|
|
if ($scan_as_cbr) { |
|
969
|
|
|
// force CBR mode, used for trying to pick out invalid audio streams with |
|
970
|
|
|
// valid(?) VBR headers, or VBR streams with no VBR header |
|
971
|
|
|
if (!isset($next_frame_test_array['mpeg']['audio']['bitrate']) || !isset($info['mpeg']['audio']['bitrate']) || ($next_frame_test_array['mpeg']['audio']['bitrate'] != $info['mpeg']['audio']['bitrate'])) { |
|
972
|
|
|
return false; |
|
973
|
|
|
} |
|
974
|
|
|
} |
|
975
|
|
|
|
|
976
|
|
|
|
|
977
|
|
|
// next frame is OK, get ready to check the one after that |
|
978
|
|
|
if (isset($next_frame_test_array['mpeg']['audio']['framelength']) && ($next_frame_test_array['mpeg']['audio']['framelength'] > 0)) { |
|
979
|
|
|
$next_frame_test_offset += $next_frame_test_array['mpeg']['audio']['framelength']; |
|
980
|
|
|
} else { |
|
981
|
|
|
|
|
982
|
|
|
// non-fatal error: Frame at offset $offset has an invalid frame length. |
|
983
|
|
|
return; |
|
984
|
|
|
} |
|
985
|
|
|
|
|
986
|
|
|
} else { |
|
987
|
|
|
|
|
988
|
|
|
// non-fatal error: Next frame is not valid. |
|
989
|
|
|
return; |
|
990
|
|
|
} |
|
991
|
|
|
} |
|
992
|
|
|
return true; |
|
993
|
|
|
} |
|
994
|
|
|
|
|
995
|
|
|
|
|
996
|
|
|
|
|
997
|
|
|
public function FreeFormatFrameLength($fd, $offset, &$info, $deep_scan=false) { |
|
998
|
|
|
fseek($fd, $offset, SEEK_SET); |
|
999
|
|
|
$mpeg_audio_data = fread($fd, 32768); |
|
1000
|
|
|
|
|
1001
|
|
|
$sync_pattern1 = substr($mpeg_audio_data, 0, 4); |
|
1002
|
|
|
// may be different pattern due to padding |
|
1003
|
|
|
$sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) | 0x02).$sync_pattern1{3}; |
|
1004
|
|
|
if ($sync_pattern2 === $sync_pattern1) { |
|
1005
|
|
|
$sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) & 0xFD).$sync_pattern1{3}; |
|
1006
|
|
|
} |
|
1007
|
|
|
|
|
1008
|
|
|
$frame_length = false; |
|
1009
|
|
|
$frame_length1 = strpos($mpeg_audio_data, $sync_pattern1, 4); |
|
1010
|
|
|
$frame_length2 = strpos($mpeg_audio_data, $sync_pattern2, 4); |
|
1011
|
|
|
if ($frame_length1 > 4) { |
|
1012
|
|
|
$frame_length = $frame_length1; |
|
1013
|
|
|
} |
|
1014
|
|
|
if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) { |
|
1015
|
|
|
$frame_length = $frame_length2; |
|
1016
|
|
|
} |
|
1017
|
|
|
if (!$frame_length) { |
|
|
|
|
|
|
1018
|
|
|
|
|
1019
|
|
|
// LAME 3.88 has a different value for modeextension on the first frame vs the rest |
|
1020
|
|
|
$frame_length1 = strpos($mpeg_audio_data, substr($sync_pattern1, 0, 3), 4); |
|
1021
|
|
|
$frame_length2 = strpos($mpeg_audio_data, substr($sync_pattern2, 0, 3), 4); |
|
1022
|
|
|
|
|
1023
|
|
|
if ($frame_length1 > 4) { |
|
1024
|
|
|
$frame_length = $frame_length1; |
|
1025
|
|
|
} |
|
1026
|
|
|
if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) { |
|
1027
|
|
|
$frame_length = $frame_length2; |
|
1028
|
|
|
} |
|
1029
|
|
|
if (!$frame_length) { |
|
|
|
|
|
|
1030
|
|
|
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); |
|
1031
|
|
|
} else { |
|
1032
|
|
|
$this->getid3->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'); |
|
1033
|
|
|
$info['audio']['codec'] = 'LAME'; |
|
1034
|
|
|
$info['audio']['encoder'] = 'LAME3.88'; |
|
1035
|
|
|
$sync_pattern1 = substr($sync_pattern1, 0, 3); |
|
1036
|
|
|
$sync_pattern2 = substr($sync_pattern2, 0, 3); |
|
1037
|
|
|
} |
|
1038
|
|
|
} |
|
1039
|
|
|
|
|
1040
|
|
|
if ($deep_scan) { |
|
1041
|
|
|
|
|
1042
|
|
|
$actual_frame_length_values = array (); |
|
1043
|
|
|
$next_offset = $offset + $frame_length; |
|
1044
|
|
|
while ($next_offset < ($info['avdataend'] - 6)) { |
|
1045
|
|
|
fseek($fd, $next_offset - 1, SEEK_SET); |
|
1046
|
|
|
$NextSyncPattern = fread($fd, 6); |
|
1047
|
|
|
if ((substr($NextSyncPattern, 1, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 1, strlen($sync_pattern2)) == $sync_pattern2)) { |
|
1048
|
|
|
// good - found where expected |
|
1049
|
|
|
$actual_frame_length_values[] = $frame_length; |
|
1050
|
|
|
} elseif ((substr($NextSyncPattern, 0, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 0, strlen($sync_pattern2)) == $sync_pattern2)) { |
|
1051
|
|
|
// ok - found one byte earlier than expected (last frame wasn't padded, first frame was) |
|
1052
|
|
|
$actual_frame_length_values[] = ($frame_length - 1); |
|
1053
|
|
|
$next_offset--; |
|
1054
|
|
|
} elseif ((substr($NextSyncPattern, 2, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 2, strlen($sync_pattern2)) == $sync_pattern2)) { |
|
1055
|
|
|
// ok - found one byte later than expected (last frame was padded, first frame wasn't) |
|
1056
|
|
|
$actual_frame_length_values[] = ($frame_length + 1); |
|
1057
|
|
|
$next_offset++; |
|
1058
|
|
|
} else { |
|
1059
|
|
|
throw new getid3_exception('Did not find expected free-format sync pattern at offset '.$next_offset); |
|
1060
|
|
|
} |
|
1061
|
|
|
$next_offset += $frame_length; |
|
1062
|
|
|
} |
|
1063
|
|
|
if (count($actual_frame_length_values) > 0) { |
|
1064
|
|
|
$frame_length = intval(round(array_sum($actual_frame_length_values) / count($actual_frame_length_values))); |
|
1065
|
|
|
} |
|
1066
|
|
|
} |
|
1067
|
|
|
return $frame_length; |
|
1068
|
|
|
} |
|
1069
|
|
|
|
|
1070
|
|
|
|
|
1071
|
|
|
|
|
1072
|
|
|
public function getOnlyMPEGaudioInfo($fd, &$info, $avdata_offset, $bit_rate_histogram=false) { |
|
1073
|
|
|
|
|
1074
|
|
|
// looks for synch, decodes MPEG audio header |
|
1075
|
|
|
|
|
1076
|
|
|
fseek($fd, $avdata_offset, SEEK_SET); |
|
1077
|
|
|
|
|
1078
|
|
|
$sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdata_offset); |
|
1079
|
|
|
$header = fread($fd, $sync_seek_buffer_size); |
|
1080
|
|
|
$sync_seek_buffer_size = strlen($header); |
|
1081
|
|
|
$synch_seek_offset = 0; |
|
1082
|
|
|
|
|
1083
|
|
|
static $mpeg_audio_version_lookup; |
|
1084
|
|
|
static $mpeg_audio_layer_lookup; |
|
1085
|
|
|
static $mpeg_audio_bitrate_lookup; |
|
1086
|
|
|
if (empty($mpeg_audio_version_lookup)) { |
|
1087
|
|
|
$mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); |
|
1088
|
|
|
$mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); |
|
1089
|
|
|
$mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); |
|
1090
|
|
|
|
|
1091
|
|
|
} |
|
1092
|
|
|
|
|
1093
|
|
|
while ($synch_seek_offset < $sync_seek_buffer_size) { |
|
1094
|
|
|
|
|
1095
|
|
|
if ((($avdata_offset + $synch_seek_offset) < $info['avdataend']) && !feof($fd)) { |
|
1096
|
|
|
|
|
1097
|
|
|
// if a synch's not found within the first 128k bytes, then give up |
|
1098
|
|
|
if ($synch_seek_offset > $sync_seek_buffer_size) { |
|
1099
|
|
|
throw new getid3_exception('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB'); |
|
1100
|
|
|
} |
|
1101
|
|
|
|
|
1102
|
|
|
if (feof($fd)) { |
|
1103
|
|
|
throw new getid3_exception('Could not find valid MPEG audio synch before end of file'); |
|
1104
|
|
|
} |
|
1105
|
|
|
} |
|
1106
|
|
|
|
|
1107
|
|
|
if (($synch_seek_offset + 1) >= strlen($header)) { |
|
1108
|
|
|
throw new getid3_exception('Could not find valid MPEG synch before end of file'); |
|
1109
|
|
|
} |
|
1110
|
|
|
|
|
1111
|
|
|
if (($header{$synch_seek_offset} == "\xFF") && ($header{($synch_seek_offset + 1)} > "\xE0")) { // synch detected |
|
1112
|
|
|
|
|
1113
|
|
|
if (!isset($first_frame_info) && !isset($info['mpeg']['audio'])) { |
|
1114
|
|
|
$first_frame_info = $info; |
|
1115
|
|
|
$first_frame_avdata_offset = $avdata_offset + $synch_seek_offset; |
|
1116
|
|
|
if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $first_frame_info, false)) { |
|
|
|
|
|
|
1117
|
|
|
// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's |
|
1118
|
|
|
// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below |
|
1119
|
|
|
unset($first_frame_info); |
|
1120
|
|
|
} |
|
1121
|
|
|
} |
|
1122
|
|
|
|
|
1123
|
|
|
$dummy = $info; // only overwrite real data if valid header found |
|
1124
|
|
|
if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $dummy, true)) { |
|
1125
|
|
|
$info = $dummy; |
|
1126
|
|
|
$info['avdataoffset'] = $avdata_offset + $synch_seek_offset; |
|
1127
|
|
|
|
|
1128
|
|
|
switch (@$info['fileformat']) { |
|
1129
|
|
|
case '': |
|
1130
|
|
|
case 'mp3': |
|
1131
|
|
|
$info['fileformat'] = 'mp3'; |
|
1132
|
|
|
$info['audio']['dataformat'] = 'mp3'; |
|
1133
|
|
|
break; |
|
1134
|
|
|
} |
|
1135
|
|
|
if (isset($first_frame_info['mpeg']['audio']['bitrate_mode']) && ($first_frame_info['mpeg']['audio']['bitrate_mode'] == 'vbr')) { |
|
1136
|
|
|
if (!(abs($info['audio']['bitrate'] - $first_frame_info['audio']['bitrate']) <= 1)) { |
|
|
|
|
|
|
1137
|
|
|
// If there is garbage data between a valid VBR header frame and a sequence |
|
1138
|
|
|
// of valid MPEG-audio frames the VBR data is no longer discarded. |
|
1139
|
|
|
$info = $first_frame_info; |
|
1140
|
|
|
$info['avdataoffset'] = $first_frame_avdata_offset; |
|
|
|
|
|
|
1141
|
|
|
$info['fileformat'] = 'mp3'; |
|
1142
|
|
|
$info['audio']['dataformat'] = 'mp3'; |
|
1143
|
|
|
$dummy = $info; |
|
1144
|
|
|
unset($dummy['mpeg']['audio']); |
|
1145
|
|
|
$GarbageOffsetStart = $first_frame_avdata_offset + $first_frame_info['mpeg']['audio']['framelength']; |
|
1146
|
|
|
$GarbageOffsetEnd = $avdata_offset + $synch_seek_offset; |
|
1147
|
|
|
if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) { |
|
1148
|
|
|
|
|
1149
|
|
|
$info = $dummy; |
|
1150
|
|
|
$info['avdataoffset'] = $GarbageOffsetEnd; |
|
1151
|
|
|
$this->getid3->warning('apparently-valid VBR header not used because could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd); |
|
1152
|
|
|
|
|
1153
|
|
|
} else { |
|
1154
|
|
|
|
|
1155
|
|
|
$this->getid3->warning('using data from VBR header even though could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')'); |
|
1156
|
|
|
|
|
1157
|
|
|
} |
|
1158
|
|
|
} |
|
1159
|
|
|
} |
|
1160
|
|
|
if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) { |
|
1161
|
|
|
// VBR file with no VBR header |
|
1162
|
|
|
$bit_rate_histogram = true; |
|
1163
|
|
|
} |
|
1164
|
|
|
|
|
1165
|
|
|
if ($bit_rate_histogram) { |
|
1166
|
|
|
|
|
1167
|
|
|
$info['mpeg']['audio']['stereo_distribution'] = array ('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0); |
|
1168
|
|
|
$info['mpeg']['audio']['version_distribution'] = array ('1'=>0, '2'=>0, '2.5'=>0); |
|
1169
|
|
|
|
|
1170
|
|
|
if ($info['mpeg']['audio']['version'] == '1') { |
|
1171
|
|
|
if ($info['mpeg']['audio']['layer'] == 3) { |
|
1172
|
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0); |
|
1173
|
|
|
} elseif ($info['mpeg']['audio']['layer'] == 2) { |
|
1174
|
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0); |
|
1175
|
|
|
} elseif ($info['mpeg']['audio']['layer'] == 1) { |
|
1176
|
|
|
$info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0); |
|
1177
|
|
|
} |
|
1178
|
|
|
} elseif ($info['mpeg']['audio']['layer'] == 1) { |
|
1179
|
|
|
$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); |
|
1180
|
|
|
} else { |
|
1181
|
|
|
$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); |
|
1182
|
|
|
} |
|
1183
|
|
|
|
|
1184
|
|
|
$dummy = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']); |
|
1185
|
|
|
$synch_start_offset = $info['avdataoffset']; |
|
1186
|
|
|
|
|
1187
|
|
|
$fast_mode = false; |
|
1188
|
|
|
$synch_errors_found = 0; |
|
1189
|
|
|
while ($this->decodeMPEGaudioHeader($fd, $synch_start_offset, $dummy, false, false, $fast_mode)) { |
|
1190
|
|
|
$fast_mode = true; |
|
1191
|
|
|
$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']]; |
|
1192
|
|
|
|
|
1193
|
|
|
if (empty($dummy['mpeg']['audio']['framelength'])) { |
|
1194
|
|
|
$synch_errors_found++; |
|
1195
|
|
|
} |
|
1196
|
|
|
else { |
|
1197
|
|
|
@$info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++; |
|
1198
|
|
|
@$info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++; |
|
1199
|
|
|
@$info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++; |
|
1200
|
|
|
|
|
1201
|
|
|
$synch_start_offset += $dummy['mpeg']['audio']['framelength']; |
|
1202
|
|
|
} |
|
1203
|
|
|
} |
|
1204
|
|
|
if ($synch_errors_found > 0) { |
|
1205
|
|
|
$this->getid3->warning('Found '.$synch_errors_found.' synch errors in histogram analysis'); |
|
1206
|
|
|
} |
|
1207
|
|
|
|
|
1208
|
|
|
$bit_total = 0; |
|
1209
|
|
|
$frame_counter = 0; |
|
1210
|
|
|
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) { |
|
1211
|
|
|
$frame_counter += $bit_rate_count; |
|
1212
|
|
|
if ($bit_rate_value != 'free') { |
|
1213
|
|
|
$bit_total += ($bit_rate_value * $bit_rate_count); |
|
1214
|
|
|
} |
|
1215
|
|
|
} |
|
1216
|
|
|
if ($frame_counter == 0) { |
|
1217
|
|
|
throw new getid3_exception('Corrupt MP3 file: framecounter == zero'); |
|
1218
|
|
|
} |
|
1219
|
|
|
$info['mpeg']['audio']['frame_count'] = $frame_counter; |
|
1220
|
|
|
$info['mpeg']['audio']['bitrate'] = ($bit_total / $frame_counter); |
|
1221
|
|
|
|
|
1222
|
|
|
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; |
|
1223
|
|
|
|
|
1224
|
|
|
|
|
1225
|
|
|
// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently |
|
1226
|
|
|
$distinct_bit_rates = 0; |
|
1227
|
|
|
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) { |
|
1228
|
|
|
if ($bit_rate_count > 0) { |
|
1229
|
|
|
$distinct_bit_rates++; |
|
1230
|
|
|
} |
|
1231
|
|
|
} |
|
1232
|
|
|
if ($distinct_bit_rates > 1) { |
|
1233
|
|
|
$info['mpeg']['audio']['bitrate_mode'] = 'vbr'; |
|
1234
|
|
|
} else { |
|
1235
|
|
|
$info['mpeg']['audio']['bitrate_mode'] = 'cbr'; |
|
1236
|
|
|
} |
|
1237
|
|
|
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; |
|
1238
|
|
|
|
|
1239
|
|
|
} |
|
1240
|
|
|
|
|
1241
|
|
|
break; // exit while() |
|
1242
|
|
|
} |
|
1243
|
|
|
} |
|
1244
|
|
|
|
|
1245
|
|
|
$synch_seek_offset++; |
|
1246
|
|
|
if (($avdata_offset + $synch_seek_offset) >= $info['avdataend']) { |
|
1247
|
|
|
// end of file/data |
|
1248
|
|
|
|
|
1249
|
|
|
if (empty($info['mpeg']['audio'])) { |
|
1250
|
|
|
|
|
1251
|
|
|
throw new getid3_exception('could not find valid MPEG synch before end of file'); |
|
1252
|
|
|
} |
|
1253
|
|
|
break; |
|
1254
|
|
|
} |
|
1255
|
|
|
|
|
1256
|
|
|
} |
|
1257
|
|
|
|
|
1258
|
|
|
$info['audio']['channels'] = $info['mpeg']['audio']['channels']; |
|
1259
|
|
|
$info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode']; |
|
1260
|
|
|
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; |
|
1261
|
|
|
return true; |
|
1262
|
|
|
} |
|
1263
|
|
|
|
|
1264
|
|
|
|
|
1265
|
|
|
|
|
1266
|
|
|
public static function MPEGaudioVersionarray() { |
|
1267
|
|
|
|
|
1268
|
|
|
static $array = array ('2.5', false, '2', '1'); |
|
1269
|
|
|
return $array; |
|
1270
|
|
|
} |
|
1271
|
|
|
|
|
1272
|
|
|
|
|
1273
|
|
|
|
|
1274
|
|
|
public static function MPEGaudioLayerarray() { |
|
1275
|
|
|
|
|
1276
|
|
|
static $array = array (false, 3, 2, 1); |
|
1277
|
|
|
return $array; |
|
1278
|
|
|
} |
|
1279
|
|
|
|
|
1280
|
|
|
|
|
1281
|
|
|
|
|
1282
|
|
|
public static function MPEGaudioBitratearray() { |
|
1283
|
|
|
|
|
1284
|
|
|
static $array; |
|
1285
|
|
|
if (empty($array)) { |
|
1286
|
|
|
$array = array ( |
|
1287
|
|
|
'1' => array (1 => array ('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000), |
|
1288
|
|
|
2 => array ('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000), |
|
1289
|
|
|
3 => array ('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000) |
|
1290
|
|
|
), |
|
1291
|
|
|
|
|
1292
|
|
|
'2' => array (1 => array ('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000), |
|
1293
|
|
|
2 => array ('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000), |
|
1294
|
|
|
) |
|
1295
|
|
|
); |
|
1296
|
|
|
$array['2'][3] = $array['2'][2]; |
|
1297
|
|
|
$array['2.5'] = $array['2']; |
|
1298
|
|
|
} |
|
1299
|
|
|
return $array; |
|
1300
|
|
|
} |
|
1301
|
|
|
|
|
1302
|
|
|
|
|
1303
|
|
|
|
|
1304
|
|
|
public static function MPEGaudioFrequencyarray() { |
|
1305
|
|
|
|
|
1306
|
|
|
static $array = array ( |
|
1307
|
|
|
'1' => array (44100, 48000, 32000), |
|
1308
|
|
|
'2' => array (22050, 24000, 16000), |
|
1309
|
|
|
'2.5' => array (11025, 12000, 8000) |
|
1310
|
|
|
); |
|
1311
|
|
|
return $array; |
|
1312
|
|
|
} |
|
1313
|
|
|
|
|
1314
|
|
|
|
|
1315
|
|
|
|
|
1316
|
|
|
public static function MPEGaudioChannelModearray() { |
|
1317
|
|
|
|
|
1318
|
|
|
static $array = array ('stereo', 'joint stereo', 'dual channel', 'mono'); |
|
1319
|
|
|
return $array; |
|
1320
|
|
|
} |
|
1321
|
|
|
|
|
1322
|
|
|
|
|
1323
|
|
|
|
|
1324
|
|
|
public static function MPEGaudioModeExtensionarray() { |
|
1325
|
|
|
|
|
1326
|
|
|
static $array = array ( |
|
1327
|
|
|
1 => array ('4-31', '8-31', '12-31', '16-31'), |
|
1328
|
|
|
2 => array ('4-31', '8-31', '12-31', '16-31'), |
|
1329
|
|
|
3 => array ('', 'IS', 'MS', 'IS+MS') |
|
1330
|
|
|
); |
|
1331
|
|
|
return $array; |
|
1332
|
|
|
} |
|
1333
|
|
|
|
|
1334
|
|
|
|
|
1335
|
|
|
|
|
1336
|
|
|
public static function MPEGaudioEmphasisarray() { |
|
1337
|
|
|
|
|
1338
|
|
|
static $array = array ('none', '50/15ms', false, 'CCIT J.17'); |
|
1339
|
|
|
return $array; |
|
1340
|
|
|
} |
|
1341
|
|
|
|
|
1342
|
|
|
|
|
1343
|
|
|
|
|
1344
|
|
|
public static function MPEGaudioHeaderBytesValid($head4, $allow_bitrate_15=false) { |
|
1345
|
|
|
|
|
1346
|
|
|
return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allow_bitrate_15); |
|
1347
|
|
|
} |
|
1348
|
|
|
|
|
1349
|
|
|
|
|
1350
|
|
|
|
|
1351
|
|
|
public static function MPEGaudioHeaderValid($raw_array, $echo_errors=false, $allow_bitrate_15=false) { |
|
1352
|
|
|
|
|
1353
|
|
|
if (($raw_array['synch'] & 0x0FFE) != 0x0FFE) { |
|
1354
|
|
|
return false; |
|
1355
|
|
|
} |
|
1356
|
|
|
|
|
1357
|
|
|
static $mpeg_audio_version_lookup; |
|
1358
|
|
|
static $mpeg_audio_layer_lookup; |
|
1359
|
|
|
static $mpeg_audio_bitrate_lookup; |
|
1360
|
|
|
static $mpeg_audio_frequency_lookup; |
|
1361
|
|
|
static $mpeg_audio_channel_mode_lookup; |
|
1362
|
|
|
static $mpeg_audio_mode_extension_lookup; |
|
1363
|
|
|
static $mpeg_audio_emphasis_lookup; |
|
1364
|
|
|
if (empty($mpeg_audio_version_lookup)) { |
|
1365
|
|
|
$mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); |
|
1366
|
|
|
$mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); |
|
1367
|
|
|
$mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); |
|
1368
|
|
|
$mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray(); |
|
1369
|
|
|
$mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray(); |
|
1370
|
|
|
$mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray(); |
|
1371
|
|
|
$mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray(); |
|
1372
|
|
|
} |
|
1373
|
|
|
|
|
1374
|
|
|
if (isset($mpeg_audio_version_lookup[$raw_array['version']])) { |
|
1375
|
|
|
$decodedVersion = $mpeg_audio_version_lookup[$raw_array['version']]; |
|
1376
|
|
|
} else { |
|
1377
|
|
|
echo ($echo_errors ? "\n".'invalid Version ('.$raw_array['version'].')' : ''); |
|
1378
|
|
|
return false; |
|
1379
|
|
|
} |
|
1380
|
|
|
if (isset($mpeg_audio_layer_lookup[$raw_array['layer']])) { |
|
1381
|
|
|
$decodedLayer = $mpeg_audio_layer_lookup[$raw_array['layer']]; |
|
1382
|
|
|
} else { |
|
1383
|
|
|
echo ($echo_errors ? "\n".'invalid Layer ('.$raw_array['layer'].')' : ''); |
|
1384
|
|
|
return false; |
|
1385
|
|
|
} |
|
1386
|
|
|
if (!isset($mpeg_audio_bitrate_lookup[$decodedVersion][$decodedLayer][$raw_array['bitrate']])) { |
|
1387
|
|
|
echo ($echo_errors ? "\n".'invalid Bitrate ('.$raw_array['bitrate'].')' : ''); |
|
1388
|
|
|
if ($raw_array['bitrate'] == 15) { |
|
1389
|
|
|
// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0 |
|
1390
|
|
|
// let it go through here otherwise file will not be identified |
|
1391
|
|
|
if (!$allow_bitrate_15) { |
|
1392
|
|
|
return false; |
|
1393
|
|
|
} |
|
1394
|
|
|
} else { |
|
1395
|
|
|
return false; |
|
1396
|
|
|
} |
|
1397
|
|
|
} |
|
1398
|
|
|
if (!isset($mpeg_audio_frequency_lookup[$decodedVersion][$raw_array['sample_rate']])) { |
|
1399
|
|
|
echo ($echo_errors ? "\n".'invalid Frequency ('.$raw_array['sample_rate'].')' : ''); |
|
1400
|
|
|
return false; |
|
1401
|
|
|
} |
|
1402
|
|
|
if (!isset($mpeg_audio_channel_mode_lookup[$raw_array['channelmode']])) { |
|
1403
|
|
|
echo ($echo_errors ? "\n".'invalid ChannelMode ('.$raw_array['channelmode'].')' : ''); |
|
1404
|
|
|
return false; |
|
1405
|
|
|
} |
|
1406
|
|
|
if (!isset($mpeg_audio_mode_extension_lookup[$decodedLayer][$raw_array['modeextension']])) { |
|
1407
|
|
|
echo ($echo_errors ? "\n".'invalid Mode Extension ('.$raw_array['modeextension'].')' : ''); |
|
1408
|
|
|
return false; |
|
1409
|
|
|
} |
|
1410
|
|
|
if (!isset($mpeg_audio_emphasis_lookup[$raw_array['emphasis']])) { |
|
1411
|
|
|
echo ($echo_errors ? "\n".'invalid Emphasis ('.$raw_array['emphasis'].')' : ''); |
|
1412
|
|
|
return false; |
|
1413
|
|
|
} |
|
1414
|
|
|
// These are just either set or not set, you can't mess that up :) |
|
1415
|
|
|
// $raw_array['protection']; |
|
1416
|
|
|
// $raw_array['padding']; |
|
1417
|
|
|
// $raw_array['private']; |
|
1418
|
|
|
// $raw_array['copyright']; |
|
1419
|
|
|
// $raw_array['original']; |
|
1420
|
|
|
|
|
1421
|
|
|
return true; |
|
1422
|
|
|
} |
|
1423
|
|
|
|
|
1424
|
|
|
|
|
1425
|
|
|
|
|
1426
|
|
|
public static function MPEGaudioHeaderDecode($header_four_bytes) { |
|
1427
|
|
|
// AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM |
|
1428
|
|
|
// A - Frame sync (all bits set) |
|
1429
|
|
|
// B - MPEG Audio version ID |
|
1430
|
|
|
// C - Layer description |
|
1431
|
|
|
// D - Protection bit |
|
1432
|
|
|
// E - Bitrate index |
|
1433
|
|
|
// F - Sampling rate frequency index |
|
1434
|
|
|
// G - Padding bit |
|
1435
|
|
|
// H - Private bit |
|
1436
|
|
|
// I - Channel Mode |
|
1437
|
|
|
// J - Mode extension (Only if Joint stereo) |
|
1438
|
|
|
// K - Copyright |
|
1439
|
|
|
// L - Original |
|
1440
|
|
|
// M - Emphasis |
|
1441
|
|
|
|
|
1442
|
|
|
if (strlen($header_four_bytes) != 4) { |
|
1443
|
|
|
return false; |
|
1444
|
|
|
} |
|
1445
|
|
|
|
|
1446
|
|
|
$mpeg_raw_header['synch'] = (getid3_lib::BigEndian2Int(substr($header_four_bytes, 0, 2)) & 0xFFE0) >> 4; |
|
|
|
|
|
|
1447
|
|
|
$mpeg_raw_header['version'] = (ord($header_four_bytes{1}) & 0x18) >> 3; // BB |
|
1448
|
|
|
$mpeg_raw_header['layer'] = (ord($header_four_bytes{1}) & 0x06) >> 1; // CC |
|
1449
|
|
|
$mpeg_raw_header['protection'] = (ord($header_four_bytes{1}) & 0x01); // D |
|
1450
|
|
|
$mpeg_raw_header['bitrate'] = (ord($header_four_bytes{2}) & 0xF0) >> 4; // EEEE |
|
1451
|
|
|
$mpeg_raw_header['sample_rate'] = (ord($header_four_bytes{2}) & 0x0C) >> 2; // FF |
|
1452
|
|
|
$mpeg_raw_header['padding'] = (ord($header_four_bytes{2}) & 0x02) >> 1; // G |
|
1453
|
|
|
$mpeg_raw_header['private'] = (ord($header_four_bytes{2}) & 0x01); // H |
|
1454
|
|
|
$mpeg_raw_header['channelmode'] = (ord($header_four_bytes{3}) & 0xC0) >> 6; // II |
|
1455
|
|
|
$mpeg_raw_header['modeextension'] = (ord($header_four_bytes{3}) & 0x30) >> 4; // JJ |
|
1456
|
|
|
$mpeg_raw_header['copyright'] = (ord($header_four_bytes{3}) & 0x08) >> 3; // K |
|
1457
|
|
|
$mpeg_raw_header['original'] = (ord($header_four_bytes{3}) & 0x04) >> 2; // L |
|
1458
|
|
|
$mpeg_raw_header['emphasis'] = (ord($header_four_bytes{3}) & 0x03); // MM |
|
1459
|
|
|
|
|
1460
|
|
|
return $mpeg_raw_header; |
|
1461
|
|
|
} |
|
1462
|
|
|
|
|
1463
|
|
|
|
|
1464
|
|
|
|
|
1465
|
|
|
public static function MPEGaudioFrameLength(&$bit_rate, &$version, &$layer, $padding, &$sample_rate) { |
|
1466
|
|
|
|
|
1467
|
|
|
if (!isset($cache[$bit_rate][$version][$layer][$padding][$sample_rate])) { |
|
|
|
|
|
|
1468
|
|
|
$cache[$bit_rate][$version][$layer][$padding][$sample_rate] = false; |
|
|
|
|
|
|
1469
|
|
|
if ($bit_rate != 'free') { |
|
1470
|
|
|
|
|
1471
|
|
|
if ($version == '1') { |
|
1472
|
|
|
|
|
1473
|
|
|
if ($layer == '1') { |
|
1474
|
|
|
|
|
1475
|
|
|
// For Layer I slot is 32 bits long |
|
1476
|
|
|
$frame_length_coefficient = 48; |
|
1477
|
|
|
$slot_length = 4; |
|
1478
|
|
|
|
|
1479
|
|
|
} else { // Layer 2 / 3 |
|
1480
|
|
|
|
|
1481
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long. |
|
1482
|
|
|
$frame_length_coefficient = 144; |
|
1483
|
|
|
$slot_length = 1; |
|
1484
|
|
|
|
|
1485
|
|
|
} |
|
1486
|
|
|
|
|
1487
|
|
|
} else { // MPEG-2 / MPEG-2.5 |
|
1488
|
|
|
|
|
1489
|
|
|
if ($layer == '1') { |
|
1490
|
|
|
|
|
1491
|
|
|
// For Layer I slot is 32 bits long |
|
1492
|
|
|
$frame_length_coefficient = 24; |
|
1493
|
|
|
$slot_length = 4; |
|
1494
|
|
|
|
|
1495
|
|
|
} elseif ($layer == '2') { |
|
1496
|
|
|
|
|
1497
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long. |
|
1498
|
|
|
$frame_length_coefficient = 144; |
|
1499
|
|
|
$slot_length = 1; |
|
1500
|
|
|
|
|
1501
|
|
|
} else { // layer 3 |
|
1502
|
|
|
|
|
1503
|
|
|
// for Layer 2 and Layer 3 slot is 8 bits long. |
|
1504
|
|
|
$frame_length_coefficient = 72; |
|
1505
|
|
|
$slot_length = 1; |
|
1506
|
|
|
|
|
1507
|
|
|
} |
|
1508
|
|
|
|
|
1509
|
|
|
} |
|
1510
|
|
|
|
|
1511
|
|
|
// FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding |
|
1512
|
|
|
if ($sample_rate > 0) { |
|
1513
|
|
|
$new_frame_length = ($frame_length_coefficient * $bit_rate) / $sample_rate; |
|
1514
|
|
|
$new_frame_length = floor($new_frame_length / $slot_length) * $slot_length; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I) |
|
1515
|
|
|
if ($padding) { |
|
1516
|
|
|
$new_frame_length += $slot_length; |
|
1517
|
|
|
} |
|
1518
|
|
|
$cache[$bit_rate][$version][$layer][$padding][$sample_rate] = (int) $new_frame_length; |
|
1519
|
|
|
} |
|
1520
|
|
|
} |
|
1521
|
|
|
} |
|
1522
|
|
|
return $cache[$bit_rate][$version][$layer][$padding][$sample_rate]; |
|
1523
|
|
|
} |
|
1524
|
|
|
|
|
1525
|
|
|
|
|
1526
|
|
|
|
|
1527
|
|
|
public static function ClosestStandardMP3Bitrate($bit_rate) { |
|
1528
|
|
|
|
|
1529
|
|
|
static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000); |
|
1530
|
|
|
static $bit_rate_table = array (0=>'-'); |
|
1531
|
|
|
$round_bit_rate = intval(round($bit_rate, -3)); |
|
1532
|
|
|
if (!isset($bit_rate_table[$round_bit_rate])) { |
|
1533
|
|
|
if ($round_bit_rate > 320000) { |
|
1534
|
|
|
$bit_rate_table[$round_bit_rate] = round($bit_rate, -4); |
|
1535
|
|
|
} else { |
|
1536
|
|
|
$last_bit_rate = 320000; |
|
1537
|
|
|
foreach ($standard_bit_rates as $standard_bit_rate) { |
|
1538
|
|
|
$bit_rate_table[$round_bit_rate] = $standard_bit_rate; |
|
1539
|
|
|
if ($round_bit_rate >= $standard_bit_rate - (($last_bit_rate - $standard_bit_rate) / 2)) { |
|
1540
|
|
|
break; |
|
1541
|
|
|
} |
|
1542
|
|
|
$last_bit_rate = $standard_bit_rate; |
|
1543
|
|
|
} |
|
1544
|
|
|
} |
|
1545
|
|
|
} |
|
1546
|
|
|
return $bit_rate_table[$round_bit_rate]; |
|
1547
|
|
|
} |
|
1548
|
|
|
|
|
1549
|
|
|
|
|
1550
|
|
|
|
|
1551
|
|
|
public static function XingVBRidOffset($version, $channel_mode) { |
|
1552
|
|
|
|
|
1553
|
|
|
static $lookup = array ( |
|
1554
|
|
|
'1' => array ('mono' => 0x15, // 4 + 17 = 21 |
|
1555
|
|
|
'stereo' => 0x24, // 4 + 32 = 36 |
|
1556
|
|
|
'joint stereo' => 0x24, |
|
1557
|
|
|
'dual channel' => 0x24 |
|
1558
|
|
|
), |
|
1559
|
|
|
|
|
1560
|
|
|
'2' => array ('mono' => 0x0D, // 4 + 9 = 13 |
|
1561
|
|
|
'stereo' => 0x15, // 4 + 17 = 21 |
|
1562
|
|
|
'joint stereo' => 0x15, |
|
1563
|
|
|
'dual channel' => 0x15 |
|
1564
|
|
|
), |
|
1565
|
|
|
|
|
1566
|
|
|
'2.5' => array ('mono' => 0x15, |
|
1567
|
|
|
'stereo' => 0x15, |
|
1568
|
|
|
'joint stereo' => 0x15, |
|
1569
|
|
|
'dual channel' => 0x15 |
|
1570
|
|
|
) |
|
1571
|
|
|
); |
|
1572
|
|
|
|
|
1573
|
|
|
return $lookup[$version][$channel_mode]; |
|
1574
|
|
|
} |
|
1575
|
|
|
|
|
1576
|
|
|
|
|
1577
|
|
|
|
|
1578
|
|
|
public static function LAMEvbrMethodLookup($vbr_method_id) { |
|
1579
|
|
|
|
|
1580
|
|
|
static $lookup = array ( |
|
1581
|
|
|
0x00 => 'unknown', |
|
1582
|
|
|
0x01 => 'cbr', |
|
1583
|
|
|
0x02 => 'abr', |
|
1584
|
|
|
0x03 => 'vbr-old / vbr-rh', |
|
1585
|
|
|
0x04 => 'vbr-new / vbr-mtrh', |
|
1586
|
|
|
0x05 => 'vbr-mt', |
|
1587
|
|
|
0x06 => 'Full VBR Method 4', |
|
1588
|
|
|
0x08 => 'constant bitrate 2 pass', |
|
1589
|
|
|
0x09 => 'abr 2 pass', |
|
1590
|
|
|
0x0F => 'reserved' |
|
1591
|
|
|
); |
|
1592
|
|
|
return (isset($lookup[$vbr_method_id]) ? $lookup[$vbr_method_id] : ''); |
|
1593
|
|
|
} |
|
1594
|
|
|
|
|
1595
|
|
|
|
|
1596
|
|
|
|
|
1597
|
|
|
public static function LAMEmiscStereoModeLookup($stereo_mode_id) { |
|
1598
|
|
|
|
|
1599
|
|
|
static $lookup = array ( |
|
1600
|
|
|
0 => 'mono', |
|
1601
|
|
|
1 => 'stereo', |
|
1602
|
|
|
2 => 'dual mono', |
|
1603
|
|
|
3 => 'joint stereo', |
|
1604
|
|
|
4 => 'forced stereo', |
|
1605
|
|
|
5 => 'auto', |
|
1606
|
|
|
6 => 'intensity stereo', |
|
1607
|
|
|
7 => 'other' |
|
1608
|
|
|
); |
|
1609
|
|
|
return (isset($lookup[$stereo_mode_id]) ? $lookup[$stereo_mode_id] : ''); |
|
1610
|
|
|
} |
|
1611
|
|
|
|
|
1612
|
|
|
|
|
1613
|
|
|
|
|
1614
|
|
|
public static function LAMEmiscSourceSampleFrequencyLookup($source_sample_frequency_id) { |
|
1615
|
|
|
|
|
1616
|
|
|
static $lookup = array ( |
|
1617
|
|
|
0 => '<= 32 kHz', |
|
1618
|
|
|
1 => '44.1 kHz', |
|
1619
|
|
|
2 => '48 kHz', |
|
1620
|
|
|
3 => '> 48kHz' |
|
1621
|
|
|
); |
|
1622
|
|
|
return (isset($lookup[$source_sample_frequency_id]) ? $lookup[$source_sample_frequency_id] : ''); |
|
1623
|
|
|
} |
|
1624
|
|
|
|
|
1625
|
|
|
|
|
1626
|
|
|
|
|
1627
|
|
|
public static function LAMEsurroundInfoLookup($surround_info_id) { |
|
1628
|
|
|
|
|
1629
|
|
|
static $lookup = array ( |
|
1630
|
|
|
0 => 'no surround info', |
|
1631
|
|
|
1 => 'DPL encoding', |
|
1632
|
|
|
2 => 'DPL2 encoding', |
|
1633
|
|
|
3 => 'Ambisonic encoding' |
|
1634
|
|
|
); |
|
1635
|
|
|
return (isset($lookup[$surround_info_id]) ? $lookup[$surround_info_id] : 'reserved'); |
|
1636
|
|
|
} |
|
1637
|
|
|
|
|
1638
|
|
|
|
|
1639
|
|
|
|
|
1640
|
|
|
public static function LAMEpresetUsedLookup($lame_tag) { |
|
1641
|
|
|
|
|
1642
|
|
|
if ($lame_tag['preset_used_id'] == 0) { |
|
1643
|
|
|
// no preset used (LAME >=3.93) |
|
1644
|
|
|
// no preset recorded (LAME <3.93) |
|
1645
|
|
|
return ''; |
|
1646
|
|
|
} |
|
1647
|
|
|
|
|
1648
|
|
|
$lame_preset_used_lookup = array (); |
|
1649
|
|
|
|
|
1650
|
|
|
for ($i = 8; $i <= 320; $i++) { |
|
1651
|
|
|
switch ($lame_tag['vbr_method']) { |
|
1652
|
|
|
case 'cbr': |
|
1653
|
|
|
$lame_preset_used_lookup[$i] = '--alt-preset '.$lame_tag['vbr_method'].' '.$i; |
|
1654
|
|
|
break; |
|
1655
|
|
|
case 'abr': |
|
1656
|
|
|
default: // other VBR modes shouldn't be here(?) |
|
1657
|
|
|
$lame_preset_used_lookup[$i] = '--alt-preset '.$i; |
|
1658
|
|
|
break; |
|
1659
|
|
|
} |
|
1660
|
|
|
} |
|
1661
|
|
|
|
|
1662
|
|
|
// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions() |
|
1663
|
|
|
|
|
1664
|
|
|
// named alt-presets |
|
1665
|
|
|
$lame_preset_used_lookup[1000] = '--r3mix'; |
|
1666
|
|
|
$lame_preset_used_lookup[1001] = '--alt-preset standard'; |
|
1667
|
|
|
$lame_preset_used_lookup[1002] = '--alt-preset extreme'; |
|
1668
|
|
|
$lame_preset_used_lookup[1003] = '--alt-preset insane'; |
|
1669
|
|
|
$lame_preset_used_lookup[1004] = '--alt-preset fast standard'; |
|
1670
|
|
|
$lame_preset_used_lookup[1005] = '--alt-preset fast extreme'; |
|
1671
|
|
|
$lame_preset_used_lookup[1006] = '--alt-preset medium'; |
|
1672
|
|
|
$lame_preset_used_lookup[1007] = '--alt-preset fast medium'; |
|
1673
|
|
|
|
|
1674
|
|
|
// LAME 3.94 additions/changes |
|
1675
|
|
|
$lame_preset_used_lookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003 |
|
1676
|
|
|
$lame_preset_used_lookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003 |
|
1677
|
|
|
|
|
1678
|
|
|
$lame_preset_used_lookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003 |
|
1679
|
|
|
$lame_preset_used_lookup[410] = '-V9'; |
|
1680
|
|
|
$lame_preset_used_lookup[420] = '-V8'; |
|
1681
|
|
|
$lame_preset_used_lookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003 |
|
1682
|
|
|
$lame_preset_used_lookup[440] = '-V6'; |
|
1683
|
|
|
$lame_preset_used_lookup[450] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003 |
|
1684
|
|
|
$lame_preset_used_lookup[460] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003 |
|
1685
|
|
|
$lame_preset_used_lookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003 |
|
1686
|
|
|
$lame_preset_used_lookup[480] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003 |
|
1687
|
|
|
$lame_preset_used_lookup[490] = '-V1'; |
|
1688
|
|
|
$lame_preset_used_lookup[500] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003 |
|
1689
|
|
|
|
|
1690
|
|
|
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 [email protected]'); |
|
1691
|
|
|
} |
|
1692
|
|
|
|
|
1693
|
|
|
|
|
1694
|
|
|
} |
|
1695
|
|
|
|
|
1696
|
|
|
?> |
|
|
|
|
|
mambax7 /
xoopseditors
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