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1 <?php
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2 // +----------------------------------------------------------------------+
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3 // | PHP version 5 |
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4 // +----------------------------------------------------------------------+
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5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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6 // +----------------------------------------------------------------------+
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7 // | This source file is subject to version 2 of the GPL license, |
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8 // | that is bundled with this package in the file license.txt and is |
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9 // | available through the world-wide-web at the following url: |
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10 // | http://www.gnu.org/copyleft/gpl.html |
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11 // +----------------------------------------------------------------------+
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12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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13 // +----------------------------------------------------------------------+
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14 // | Authors: James Heinrich <infoØgetid3*org> |
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15 // | Allan Hansen <ahØartemis*dk> |
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16 // +----------------------------------------------------------------------+
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17 // | module.audio.mp3.php |
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18 // | Module for analyzing MPEG Audio Layer 1,2,3 files. |
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19 // | dependencies: none |
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20 // +----------------------------------------------------------------------+
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21 //
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22 // $Id: module.audio.mp3.php,v 1.10 2006/11/16 22:57:57 ah Exp $
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23
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24
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25
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26 class getid3_mp3 extends getid3_handler
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27 {
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28 // Number of frames to scan to determine if MPEG-audio sequence is valid.
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29 // Lower this number to 5-20 for faster scanning
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30 // Increase this number to 50+ for most accurate detection of valid VBR/CBR mpeg-audio streams
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31 const VALID_CHECK_FRAMES = 35;
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32
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33
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34 public function Analyze() {
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35
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36 $this->getAllMPEGInfo($this->getid3->fp, $this->getid3->info);
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37
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38 return true;
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39 }
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40
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41
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42 public function AnalyzeMPEGaudioInfo() {
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43
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44 $this->getOnlyMPEGaudioInfo($this->getid3->fp, $this->getid3->info, $this->getid3->info['avdataoffset'], false);
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45 }
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46
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47
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48 public function getAllMPEGInfo(&$fd, &$info) {
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49
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50 $this->getOnlyMPEGaudioInfo($fd, $info, 0 + $info['avdataoffset']);
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51
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52 if (isset($info['mpeg']['audio']['bitrate_mode'])) {
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53 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
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54 }
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55
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56 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0)))) {
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57
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58 $synch_offset_warning = 'Unknown data before synch ';
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59 if (isset($info['id3v2']['headerlength'])) {
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60 $synch_offset_warning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
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61 } else {
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62 $synch_offset_warning .= '(should be at beginning of file, ';
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63 }
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64 $synch_offset_warning .= 'synch detected at '.$info['avdataoffset'].')';
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65 if ($info['audio']['bitrate_mode'] == 'cbr') {
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66
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67 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
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68
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69 $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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70 $info['audio']['codec'] = 'LAME';
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71 $current_data_lame_version_string = 'LAME3.';
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72
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73 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
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74
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75 $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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76 $info['audio']['codec'] = 'LAME';
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77 $current_data_lame_version_string = 'LAME3.';
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78
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79 }
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80
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81 }
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82 $this->getid3->warning($synch_offset_warning);
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83
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84 }
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85
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86 if (isset($info['mpeg']['audio']['LAME'])) {
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87 $info['audio']['codec'] = 'LAME';
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88 if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
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89 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
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90 } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
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91 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
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92 }
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93 }
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94
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95 $current_data_lame_version_string = (!empty($current_data_lame_version_string) ? $current_data_lame_version_string : @$info['audio']['encoder']);
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96 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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97 // a version number of LAME that does not end with a number like "LAME3.92"
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98 // or with a closing parenthesis like "LAME3.88 (alpha)"
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99 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
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100
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101 // not sure what the actual last frame length will be, but will be less than or equal to 1441
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102 $possibly_longer_lame_version_frame_length = 1441;
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103
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104 // Not sure what version of LAME this is - look in padding of last frame for longer version string
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105 $possible_lame_version_string_offset = $info['avdataend'] - $possibly_longer_lame_version_frame_length;
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106 fseek($fd, $possible_lame_version_string_offset);
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107 $possibly_longer_lame_version_data = fread($fd, $possibly_longer_lame_version_frame_length);
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108 switch (substr($current_data_lame_version_string, -1)) {
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109 case 'a':
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110 case 'b':
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111 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
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112 // need to trim off "a" to match longer string
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113 $current_data_lame_version_string = substr($current_data_lame_version_string, 0, -1);
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114 break;
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115 }
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116 if (($possibly_longer_lame_version_string = strstr($possibly_longer_lame_version_data, $current_data_lame_version_string)) !== false) {
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117 if (substr($possibly_longer_lame_version_string, 0, strlen($current_data_lame_version_string)) == $current_data_lame_version_string) {
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118 $possibly_longer_lame_version_new_string = substr($possibly_longer_lame_version_string, 0, strspn($possibly_longer_lame_version_string, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
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119 if (strlen($possibly_longer_lame_version_new_string) > strlen(@$info['audio']['encoder'])) {
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120 $info['audio']['encoder'] = $possibly_longer_lame_version_new_string;
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121 }
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122 }
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123 }
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124 }
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125 if (!empty($info['audio']['encoder'])) {
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126 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
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127 }
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128
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129 switch (@$info['mpeg']['audio']['layer']) {
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130 case 1:
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131 case 2:
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132 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
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133 break;
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134 }
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135 if (@$info['fileformat'] == 'mp3') {
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136 switch ($info['audio']['dataformat']) {
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137 case 'mp1':
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138 case 'mp2':
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139 case 'mp3':
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140 $info['fileformat'] = $info['audio']['dataformat'];
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141 break;
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142
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143 default:
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144 $this->getid3->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"');
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145 break;
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146 }
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147 }
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148
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149 $info['mime_type'] = 'audio/mpeg';
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150 $info['audio']['lossless'] = false;
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151
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152 // Calculate playtime
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153 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
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154 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];
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155 }
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156
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157 $info['audio']['encoder_options'] = getid3_mp3::GuessEncoderOptions($info);
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158
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159 return true;
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160 }
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161
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162
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163
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164 public static function GuessEncoderOptions(&$info) {
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165 // shortcuts
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166 if (!empty($info['mpeg']['audio'])) {
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167 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
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168 if (!empty($thisfile_mpeg_audio['LAME'])) {
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169 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
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170 }
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171 }
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172
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173 $encoder_options = '';
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174 static $named_preset_bitrates = array (16, 24, 40, 56, 112, 128, 160, 192, 256);
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175
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176 if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
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177
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178 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
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179
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180 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $named_preset_bitrates))) {
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181
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182 $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
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183
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184 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
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185
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186 static $known_encoder_values = array ();
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187 if (empty($known_encoder_values)) {
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188
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189 //$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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190 $known_encoder_values[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
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191 $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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192 $known_encoder_values[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
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193 $known_encoder_values['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
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194 $known_encoder_values['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
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195 $known_encoder_values['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
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196 $known_encoder_values['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
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197 $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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198 $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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199 $known_encoder_values['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
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200 $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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201 $known_encoder_values['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
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202 $known_encoder_values['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
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203 $known_encoder_values['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
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204 $known_encoder_values['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
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205 $known_encoder_values['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
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206 $known_encoder_values['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
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207
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208 $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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209 $known_encoder_values[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
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210 $known_encoder_values[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
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211 $known_encoder_values[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
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212 $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 $known_encoder_values[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
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214 $known_encoder_values[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
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215 $known_encoder_values[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
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216 $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 $known_encoder_values[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
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218 $known_encoder_values[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
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219 $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 $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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221 $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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222 $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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223 $known_encoder_values[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
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224 $known_encoder_values[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
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225 $known_encoder_values[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
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226 $known_encoder_values[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
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227 $known_encoder_values[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
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|
rlm@3
|
228 $known_encoder_values[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
|
|
rlm@3
|
229 $known_encoder_values[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
|
|
rlm@3
|
230 $known_encoder_values[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
|
|
rlm@3
|
231 $known_encoder_values[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
|
|
rlm@3
|
232 $known_encoder_values[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
|
|
rlm@3
|
233 $known_encoder_values[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
|
|
rlm@3
|
234 $known_encoder_values[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
|
|
rlm@3
|
235 $known_encoder_values[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
|
|
rlm@3
|
236 $known_encoder_values[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
|
|
rlm@3
|
237 $known_encoder_values[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
|
|
rlm@3
|
238 $known_encoder_values[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
|
|
rlm@3
|
239 $known_encoder_values[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
|
|
rlm@3
|
240 $known_encoder_values[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
|
|
rlm@3
|
241 }
|
|
rlm@3
|
242
|
|
rlm@3
|
243 if (isset($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']])) {
|
|
rlm@3
|
244
|
|
rlm@3
|
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']];
|
|
rlm@3
|
246
|
|
rlm@3
|
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']])) {
|
|
rlm@3
|
248
|
|
rlm@3
|
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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
|
|
rlm@3
|
250
|
|
rlm@3
|
251 } elseif ($info['audio']['bitrate_mode'] == 'vbr') {
|
|
rlm@3
|
252
|
|
rlm@3
|
253 // http://gabriel.mp3-tech.org/mp3infotag.html
|
|
rlm@3
|
254 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
|
|
rlm@3
|
255
|
|
rlm@3
|
256
|
|
rlm@3
|
257 $lame_v_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
|
|
rlm@3
|
258 $lame_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($lame_v_value * 10);
|
|
rlm@3
|
259 $encoder_options = '-V'.$lame_v_value.' -q'.$lame_q_value;
|
|
rlm@3
|
260
|
|
rlm@3
|
261 } elseif ($info['audio']['bitrate_mode'] == 'cbr') {
|
|
rlm@3
|
262
|
|
rlm@3
|
263 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
|
|
rlm@3
|
264
|
|
rlm@3
|
265 } else {
|
|
rlm@3
|
266
|
|
rlm@3
|
267 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
|
|
rlm@3
|
268
|
|
rlm@3
|
269 }
|
|
rlm@3
|
270
|
|
rlm@3
|
271 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
|
|
rlm@3
|
272
|
|
rlm@3
|
273 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
|
|
rlm@3
|
274
|
|
rlm@3
|
275 } elseif (!empty($info['audio']['bitrate'])) {
|
|
rlm@3
|
276
|
|
rlm@3
|
277 if ($info['audio']['bitrate_mode'] == 'cbr') {
|
|
rlm@3
|
278 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
|
|
rlm@3
|
279 } else {
|
|
rlm@3
|
280 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
|
|
rlm@3
|
281 }
|
|
rlm@3
|
282
|
|
rlm@3
|
283 }
|
|
rlm@3
|
284 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
|
|
rlm@3
|
285 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
|
|
rlm@3
|
286 }
|
|
rlm@3
|
287
|
|
rlm@3
|
288 if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) {
|
|
rlm@3
|
289 $encoder_options .= ' --nogap';
|
|
rlm@3
|
290 }
|
|
rlm@3
|
291
|
|
rlm@3
|
292 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
|
|
rlm@3
|
293 $exploded_options = explode(' ', $encoder_options, 4);
|
|
rlm@3
|
294 if ($exploded_options[0] == '--r3mix') {
|
|
rlm@3
|
295 $exploded_options[1] = 'r3mix';
|
|
rlm@3
|
296 }
|
|
rlm@3
|
297 switch ($exploded_options[0]) {
|
|
rlm@3
|
298 case '--preset':
|
|
rlm@3
|
299 case '--alt-preset':
|
|
rlm@3
|
300 case '--r3mix':
|
|
rlm@3
|
301 if ($exploded_options[1] == 'fast') {
|
|
rlm@3
|
302 $exploded_options[1] .= ' '.$exploded_options[2];
|
|
rlm@3
|
303 }
|
|
rlm@3
|
304 switch ($exploded_options[1]) {
|
|
rlm@3
|
305 case 'portable':
|
|
rlm@3
|
306 case 'medium':
|
|
rlm@3
|
307 case 'standard':
|
|
rlm@3
|
308 case 'extreme':
|
|
rlm@3
|
309 case 'insane':
|
|
rlm@3
|
310 case 'fast portable':
|
|
rlm@3
|
311 case 'fast medium':
|
|
rlm@3
|
312 case 'fast standard':
|
|
rlm@3
|
313 case 'fast extreme':
|
|
rlm@3
|
314 case 'fast insane':
|
|
rlm@3
|
315 case 'r3mix':
|
|
rlm@3
|
316 static $expected_lowpass = array (
|
|
rlm@3
|
317 'insane|20500' => 20500,
|
|
rlm@3
|
318 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
|
|
rlm@3
|
319 'medium|18000' => 18000,
|
|
rlm@3
|
320 'fast medium|18000' => 18000,
|
|
rlm@3
|
321 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
|
|
rlm@3
|
322 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
|
|
rlm@3
|
323 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
|
|
rlm@3
|
324 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
|
|
rlm@3
|
325 'standard|19000' => 19000,
|
|
rlm@3
|
326 'fast standard|19000' => 19000,
|
|
rlm@3
|
327 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
|
|
rlm@3
|
328 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
|
|
rlm@3
|
329 'r3mix|18000' => 18000, // 3.94, 3.95
|
|
rlm@3
|
330 );
|
|
rlm@3
|
331 if (!isset($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))) {
|
|
rlm@3
|
332 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
|
|
rlm@3
|
333 }
|
|
rlm@3
|
334 break;
|
|
rlm@3
|
335
|
|
rlm@3
|
336 default:
|
|
rlm@3
|
337 break;
|
|
rlm@3
|
338 }
|
|
rlm@3
|
339 break;
|
|
rlm@3
|
340 }
|
|
rlm@3
|
341 }
|
|
rlm@3
|
342
|
|
rlm@3
|
343 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
|
|
rlm@3
|
344 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
|
|
rlm@3
|
345 $encoder_options .= ' --resample 44100';
|
|
rlm@3
|
346 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
|
|
rlm@3
|
347 $encoder_options .= ' --resample 48000';
|
|
rlm@3
|
348 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
|
|
rlm@3
|
349 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
|
|
rlm@3
|
350 case 0: // <= 32000
|
|
rlm@3
|
351 // may or may not be same as source frequency - ignore
|
|
rlm@3
|
352 break;
|
|
rlm@3
|
353 case 1: // 44100
|
|
rlm@3
|
354 case 2: // 48000
|
|
rlm@3
|
355 case 3: // 48000+
|
|
rlm@3
|
356 $exploded_options = explode(' ', $encoder_options, 4);
|
|
rlm@3
|
357 switch ($exploded_options[0]) {
|
|
rlm@3
|
358 case '--preset':
|
|
rlm@3
|
359 case '--alt-preset':
|
|
rlm@3
|
360 switch ($exploded_options[1]) {
|
|
rlm@3
|
361 case 'fast':
|
|
rlm@3
|
362 case 'portable':
|
|
rlm@3
|
363 case 'medium':
|
|
rlm@3
|
364 case 'standard':
|
|
rlm@3
|
365 case 'extreme':
|
|
rlm@3
|
366 case 'insane':
|
|
rlm@3
|
367 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
|
|
rlm@3
|
368 break;
|
|
rlm@3
|
369
|
|
rlm@3
|
370 default:
|
|
rlm@3
|
371 static $expected_resampled_rate = array (
|
|
rlm@3
|
372 'phon+/lw/mw-eu/sw|16000' => 16000,
|
|
rlm@3
|
373 'mw-us|24000' => 24000, // 3.95
|
|
rlm@3
|
374 'mw-us|32000' => 32000, // 3.93
|
|
rlm@3
|
375 'mw-us|16000' => 16000, // 3.92
|
|
rlm@3
|
376 'phone|16000' => 16000,
|
|
rlm@3
|
377 'phone|11025' => 11025, // 3.94a15
|
|
rlm@3
|
378 'radio|32000' => 32000, // 3.94a15
|
|
rlm@3
|
379 'fm/radio|32000' => 32000, // 3.92
|
|
rlm@3
|
380 'fm|32000' => 32000, // 3.90
|
|
rlm@3
|
381 'voice|32000' => 32000);
|
|
rlm@3
|
382 if (!isset($expected_resampled_rate[$exploded_options[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
|
|
rlm@3
|
383 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
|
|
rlm@3
|
384 }
|
|
rlm@3
|
385 break;
|
|
rlm@3
|
386 }
|
|
rlm@3
|
387 break;
|
|
rlm@3
|
388
|
|
rlm@3
|
389 case '--r3mix':
|
|
rlm@3
|
390 default:
|
|
rlm@3
|
391 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
|
|
rlm@3
|
392 break;
|
|
rlm@3
|
393 }
|
|
rlm@3
|
394 break;
|
|
rlm@3
|
395 }
|
|
rlm@3
|
396 }
|
|
rlm@3
|
397 }
|
|
rlm@3
|
398 if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
|
|
rlm@3
|
399 //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
|
|
rlm@3
|
400 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
|
|
rlm@3
|
401 }
|
|
rlm@3
|
402
|
|
rlm@3
|
403 return $encoder_options;
|
|
rlm@3
|
404 }
|
|
rlm@3
|
405
|
|
rlm@3
|
406
|
|
rlm@3
|
407
|
|
rlm@3
|
408 public function decodeMPEGaudioHeader($fd, $offset, &$info, $recursive_search=true, $scan_as_cbr=false, $fast_mpeg_header_scan=false) {
|
|
rlm@3
|
409
|
|
rlm@3
|
410 static $mpeg_audio_version_lookup;
|
|
rlm@3
|
411 static $mpeg_audio_layer_lookup;
|
|
rlm@3
|
412 static $mpeg_audio_bitrate_lookup;
|
|
rlm@3
|
413 static $mpeg_audio_frequency_lookup;
|
|
rlm@3
|
414 static $mpeg_audio_channel_mode_lookup;
|
|
rlm@3
|
415 static $mpeg_audio_mode_extension_lookup;
|
|
rlm@3
|
416 static $mpeg_audio_emphasis_lookup;
|
|
rlm@3
|
417 if (empty($mpeg_audio_version_lookup)) {
|
|
rlm@3
|
418 $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();
|
|
rlm@3
|
419 $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();
|
|
rlm@3
|
420 $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();
|
|
rlm@3
|
421 $mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray();
|
|
rlm@3
|
422 $mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray();
|
|
rlm@3
|
423 $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray();
|
|
rlm@3
|
424 $mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray();
|
|
rlm@3
|
425 }
|
|
rlm@3
|
426
|
|
rlm@3
|
427 if ($offset >= $info['avdataend']) {
|
|
rlm@3
|
428
|
|
rlm@3
|
429 // non-fatal error: 'end of file encounter looking for MPEG synch'
|
|
rlm@3
|
430 return;
|
|
rlm@3
|
431
|
|
rlm@3
|
432 }
|
|
rlm@3
|
433 fseek($fd, $offset, SEEK_SET);
|
|
rlm@3
|
434 $header_string = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
|
|
rlm@3
|
435
|
|
rlm@3
|
436 // MP3 audio frame structure:
|
|
rlm@3
|
437 // $aa $aa $aa $aa [$bb $bb] $cc...
|
|
rlm@3
|
438 // where $aa..$aa is the four-byte mpeg-audio header (below)
|
|
rlm@3
|
439 // $bb $bb is the optional 2-byte CRC
|
|
rlm@3
|
440 // and $cc... is the audio data
|
|
rlm@3
|
441
|
|
rlm@3
|
442 $head4 = substr($header_string, 0, 4);
|
|
rlm@3
|
443
|
|
rlm@3
|
444 if (isset($mpeg_audio_header_decode_cache[$head4])) {
|
|
rlm@3
|
445 $mpeg_header_raw_array= $mpeg_audio_header_decode_cache[$head4];
|
|
rlm@3
|
446 } else {
|
|
rlm@3
|
447 $mpeg_header_raw_array = getid3_mp3::MPEGaudioHeaderDecode($head4);
|
|
rlm@3
|
448 $mpeg_audio_header_decode_cache[$head4] = $mpeg_header_raw_array;
|
|
rlm@3
|
449 }
|
|
rlm@3
|
450
|
|
rlm@3
|
451 // Not in cache
|
|
rlm@3
|
452 if (!isset($mpeg_audio_header_valid_cache[$head4])) {
|
|
rlm@3
|
453 $mpeg_audio_header_valid_cache[$head4] = getid3_mp3::MPEGaudioHeaderValid($mpeg_header_raw_array, false, false);
|
|
rlm@3
|
454 }
|
|
rlm@3
|
455
|
|
rlm@3
|
456 // shortcut
|
|
rlm@3
|
457 if (!isset($info['mpeg']['audio'])) {
|
|
rlm@3
|
458 $info['mpeg']['audio'] = array ();
|
|
rlm@3
|
459 }
|
|
rlm@3
|
460 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
|
|
rlm@3
|
461
|
|
rlm@3
|
462
|
|
rlm@3
|
463 if ($mpeg_audio_header_valid_cache[$head4]) {
|
|
rlm@3
|
464 $thisfile_mpeg_audio['raw'] = $mpeg_header_raw_array;
|
|
rlm@3
|
465 } else {
|
|
rlm@3
|
466
|
|
rlm@3
|
467 // non-fatal error: Invalid MPEG audio header at offset $offset
|
|
rlm@3
|
468 return;
|
|
rlm@3
|
469 }
|
|
rlm@3
|
470
|
|
rlm@3
|
471 if (!$fast_mpeg_header_scan) {
|
|
rlm@3
|
472
|
|
rlm@3
|
473 $thisfile_mpeg_audio['version'] = $mpeg_audio_version_lookup[$thisfile_mpeg_audio['raw']['version']];
|
|
rlm@3
|
474 $thisfile_mpeg_audio['layer'] = $mpeg_audio_layer_lookup[$thisfile_mpeg_audio['raw']['layer']];
|
|
rlm@3
|
475
|
|
rlm@3
|
476 $thisfile_mpeg_audio['channelmode'] = $mpeg_audio_channel_mode_lookup[$thisfile_mpeg_audio['raw']['channelmode']];
|
|
rlm@3
|
477 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
|
|
rlm@3
|
478 $thisfile_mpeg_audio['sample_rate'] = $mpeg_audio_frequency_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
|
|
rlm@3
|
479 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
|
|
rlm@3
|
480 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
|
|
rlm@3
|
481 $thisfile_mpeg_audio['modeextension'] = $mpeg_audio_mode_extension_lookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
|
|
rlm@3
|
482 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
|
|
rlm@3
|
483 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
|
|
rlm@3
|
484 $thisfile_mpeg_audio['emphasis'] = $mpeg_audio_emphasis_lookup[$thisfile_mpeg_audio['raw']['emphasis']];
|
|
rlm@3
|
485
|
|
rlm@3
|
486 $info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
|
|
rlm@3
|
487 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
|
|
rlm@3
|
488
|
|
rlm@3
|
489 if ($thisfile_mpeg_audio['protection']) {
|
|
rlm@3
|
490 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($header_string, 4, 2));
|
|
rlm@3
|
491 }
|
|
rlm@3
|
492
|
|
rlm@3
|
493 }
|
|
rlm@3
|
494
|
|
rlm@3
|
495 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
|
|
rlm@3
|
496 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
|
|
rlm@3
|
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');
|
|
rlm@3
|
498 $thisfile_mpeg_audio['raw']['bitrate'] = 0;
|
|
rlm@3
|
499 }
|
|
rlm@3
|
500 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
|
|
rlm@3
|
501 $thisfile_mpeg_audio['bitrate'] = $mpeg_audio_bitrate_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
|
|
rlm@3
|
502
|
|
rlm@3
|
503 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
|
|
rlm@3
|
504 // only skip multiple frame check if free-format bitstream found at beginning of file
|
|
rlm@3
|
505 // otherwise is quite possibly simply corrupted data
|
|
rlm@3
|
506 $recursive_search = false;
|
|
rlm@3
|
507 }
|
|
rlm@3
|
508
|
|
rlm@3
|
509 // For Layer 2 there are some combinations of bitrate and mode which are not allowed.
|
|
rlm@3
|
510 if (!$fast_mpeg_header_scan && ($thisfile_mpeg_audio['layer'] == '2')) {
|
|
rlm@3
|
511
|
|
rlm@3
|
512 $info['audio']['dataformat'] = 'mp2';
|
|
rlm@3
|
513 switch ($thisfile_mpeg_audio['channelmode']) {
|
|
rlm@3
|
514
|
|
rlm@3
|
515 case 'mono':
|
|
rlm@3
|
516 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
|
|
rlm@3
|
517 // these are ok
|
|
rlm@3
|
518 } else {
|
|
rlm@3
|
519
|
|
rlm@3
|
520 // non-fatal error: bitrate not allowed in Layer 2/mono
|
|
rlm@3
|
521 return;
|
|
rlm@3
|
522 }
|
|
rlm@3
|
523 break;
|
|
rlm@3
|
524
|
|
rlm@3
|
525 case 'stereo':
|
|
rlm@3
|
526 case 'joint stereo':
|
|
rlm@3
|
527 case 'dual channel':
|
|
rlm@3
|
528 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
|
|
rlm@3
|
529 // these are ok
|
|
rlm@3
|
530 } else {
|
|
rlm@3
|
531
|
|
rlm@3
|
532 // non-fatal error: bitrate not allowed in Layer 2/stereo/joint stereo/dual channel
|
|
rlm@3
|
533 return;
|
|
rlm@3
|
534 }
|
|
rlm@3
|
535 break;
|
|
rlm@3
|
536
|
|
rlm@3
|
537 }
|
|
rlm@3
|
538
|
|
rlm@3
|
539 }
|
|
rlm@3
|
540
|
|
rlm@3
|
541
|
|
rlm@3
|
542 if ($info['audio']['sample_rate'] > 0) {
|
|
rlm@3
|
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']);
|
|
rlm@3
|
544 }
|
|
rlm@3
|
545
|
|
rlm@3
|
546 $next_frame_test_offset = $offset + 1;
|
|
rlm@3
|
547 if ($thisfile_mpeg_audio['bitrate'] != 'free') {
|
|
rlm@3
|
548
|
|
rlm@3
|
549 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
|
|
rlm@3
|
550
|
|
rlm@3
|
551 if (isset($thisfile_mpeg_audio['framelength'])) {
|
|
rlm@3
|
552 $next_frame_test_offset = $offset + $thisfile_mpeg_audio['framelength'];
|
|
rlm@3
|
553 } else {
|
|
rlm@3
|
554
|
|
rlm@3
|
555 // non-fatal error: Frame at offset('.$offset.') is has an invalid frame length.
|
|
rlm@3
|
556 return;
|
|
rlm@3
|
557 }
|
|
rlm@3
|
558
|
|
rlm@3
|
559 }
|
|
rlm@3
|
560
|
|
rlm@3
|
561 $expected_number_of_audio_bytes = 0;
|
|
rlm@3
|
562
|
|
rlm@3
|
563 ////////////////////////////////////////////////////////////////////////////////////
|
|
rlm@3
|
564 // Variable-bitrate headers
|
|
rlm@3
|
565
|
|
rlm@3
|
566 if (substr($header_string, 4 + 32, 4) == 'VBRI') {
|
|
rlm@3
|
567 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
|
|
rlm@3
|
568 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
|
|
rlm@3
|
569
|
|
rlm@3
|
570 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
|
|
rlm@3
|
571 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
|
|
rlm@3
|
572 $info['audio']['codec'] = 'Fraunhofer';
|
|
rlm@3
|
573
|
|
rlm@3
|
574 $side_info_data = substr($header_string, 4 + 2, 32);
|
|
rlm@3
|
575
|
|
rlm@3
|
576 $fraunhofer_vbr_offset = 36;
|
|
rlm@3
|
577
|
|
rlm@3
|
578 $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 4, 2)); // VbriVersion
|
|
rlm@3
|
579 $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 6, 2)); // VbriDelay
|
|
rlm@3
|
580 $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 8, 2)); // VbriQuality
|
|
rlm@3
|
581 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 10, 4)); // VbriStreamBytes
|
|
rlm@3
|
582 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 14, 4)); // VbriStreamFrames
|
|
rlm@3
|
583 $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 18, 2)); // VbriTableSize
|
|
rlm@3
|
584 $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 20, 2)); // VbriTableScale
|
|
rlm@3
|
585 $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 22, 2)); // VbriEntryBytes
|
|
rlm@3
|
586 $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 24, 2)); // VbriEntryFrames
|
|
rlm@3
|
587
|
|
rlm@3
|
588 $expected_number_of_audio_bytes = $thisfile_mpeg_audio['VBR_bytes'];
|
|
rlm@3
|
589
|
|
rlm@3
|
590 $previous_byte_offset = $offset;
|
|
rlm@3
|
591 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
|
|
rlm@3
|
592 $fraunhofer_offset_n = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset, $thisfile_mpeg_audio['VBR_entry_bytes']));
|
|
rlm@3
|
593 $fraunhofer_vbr_offset += $thisfile_mpeg_audio['VBR_entry_bytes'];
|
|
rlm@3
|
594 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']);
|
|
rlm@3
|
595 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']) + $previous_byte_offset;
|
|
rlm@3
|
596 $previous_byte_offset += $fraunhofer_offset_n;
|
|
rlm@3
|
597 }
|
|
rlm@3
|
598
|
|
rlm@3
|
599
|
|
rlm@3
|
600 } else {
|
|
rlm@3
|
601
|
|
rlm@3
|
602 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
|
|
rlm@3
|
603 // depending on MPEG layer and number of channels
|
|
rlm@3
|
604
|
|
rlm@3
|
605 $vbr_id_offset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
|
|
rlm@3
|
606 $side_info_data = substr($header_string, 4 + 2, $vbr_id_offset - 4);
|
|
rlm@3
|
607
|
|
rlm@3
|
608 if ((substr($header_string, $vbr_id_offset, strlen('Xing')) == 'Xing') || (substr($header_string, $vbr_id_offset, strlen('Info')) == 'Info')) {
|
|
rlm@3
|
609 // 'Xing' is traditional Xing VBR frame
|
|
rlm@3
|
610 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
|
|
rlm@3
|
611 // 'Info' *can* legally be used to specify a VBR file as well, however.
|
|
rlm@3
|
612
|
|
rlm@3
|
613 // http://www.multiweb.cz/twoinches/MP3inside.htm
|
|
rlm@3
|
614 //00..03 = "Xing" or "Info"
|
|
rlm@3
|
615 //04..07 = Flags:
|
|
rlm@3
|
616 // 0x01 Frames Flag set if value for number of frames in file is stored
|
|
rlm@3
|
617 // 0x02 Bytes Flag set if value for filesize in bytes is stored
|
|
rlm@3
|
618 // 0x04 TOC Flag set if values for TOC are stored
|
|
rlm@3
|
619 // 0x08 VBR Scale Flag set if values for VBR scale is stored
|
|
rlm@3
|
620 //08..11 Frames: Number of frames in file (including the first Xing/Info one)
|
|
rlm@3
|
621 //12..15 Bytes: File length in Bytes
|
|
rlm@3
|
622 //16..115 TOC (Table of Contents):
|
|
rlm@3
|
623 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
|
|
rlm@3
|
624 // Each Byte has a value according this formula:
|
|
rlm@3
|
625 // (TOC[i] / 256) * fileLenInBytes
|
|
rlm@3
|
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:
|
|
rlm@3
|
627 // TOC[(60/240)*100] = TOC[25]
|
|
rlm@3
|
628 // and corresponding Byte in file is then approximately at:
|
|
rlm@3
|
629 // (TOC[25]/256) * 5000000
|
|
rlm@3
|
630 //116..119 VBR Scale
|
|
rlm@3
|
631
|
|
rlm@3
|
632
|
|
rlm@3
|
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
|
|
rlm@3
|
634 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
|
|
rlm@3
|
635 $thisfile_mpeg_audio['VBR_method'] = 'Xing';
|
|
rlm@3
|
636
|
|
rlm@3
|
637 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 4, 4));
|
|
rlm@3
|
638
|
|
rlm@3
|
639 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
|
|
rlm@3
|
640 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
|
|
rlm@3
|
641 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
|
|
rlm@3
|
642 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
|
|
rlm@3
|
643
|
|
rlm@3
|
644 if ($thisfile_mpeg_audio['xing_flags']['frames']) {
|
|
rlm@3
|
645 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 8, 4));
|
|
rlm@3
|
646 }
|
|
rlm@3
|
647 if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
|
|
rlm@3
|
648 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 12, 4));
|
|
rlm@3
|
649 }
|
|
rlm@3
|
650
|
|
rlm@3
|
651 if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
|
|
rlm@3
|
652
|
|
rlm@3
|
653 $frame_lengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];
|
|
rlm@3
|
654
|
|
rlm@3
|
655 if ($thisfile_mpeg_audio['layer'] == '1') {
|
|
rlm@3
|
656 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
|
|
rlm@3
|
657 $info['audio']['bitrate'] = ($frame_lengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
|
|
rlm@3
|
658 } else {
|
|
rlm@3
|
659 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
|
|
rlm@3
|
660 $info['audio']['bitrate'] = $frame_lengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
|
|
rlm@3
|
661 }
|
|
rlm@3
|
662 $thisfile_mpeg_audio['framelength'] = floor($frame_lengthfloat);
|
|
rlm@3
|
663 }
|
|
rlm@3
|
664
|
|
rlm@3
|
665 if ($thisfile_mpeg_audio['xing_flags']['toc']) {
|
|
rlm@3
|
666 $lame_toc_data = substr($header_string, $vbr_id_offset + 16, 100);
|
|
rlm@3
|
667 for ($i = 0; $i < 100; $i++) {
|
|
rlm@3
|
668 $thisfile_mpeg_audio['toc'][$i] = ord($lame_toc_data{$i});
|
|
rlm@3
|
669 }
|
|
rlm@3
|
670 }
|
|
rlm@3
|
671 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
|
|
rlm@3
|
672 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 116, 4));
|
|
rlm@3
|
673 }
|
|
rlm@3
|
674
|
|
rlm@3
|
675
|
|
rlm@3
|
676 // http://gabriel.mp3-tech.org/mp3infotag.html
|
|
rlm@3
|
677 if (substr($header_string, $vbr_id_offset + 120, 4) == 'LAME') {
|
|
rlm@3
|
678
|
|
rlm@3
|
679 // shortcut
|
|
rlm@3
|
680 $thisfile_mpeg_audio['LAME'] = array ();
|
|
rlm@3
|
681 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
|
|
rlm@3
|
682
|
|
rlm@3
|
683
|
|
rlm@3
|
684 $thisfile_mpeg_audio_lame['long_version'] = substr($header_string, $vbr_id_offset + 120, 20);
|
|
rlm@3
|
685 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
|
|
rlm@3
|
686
|
|
rlm@3
|
687 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
|
|
rlm@3
|
688
|
|
rlm@3
|
689 // extra 11 chars are not part of version string when LAMEtag present
|
|
rlm@3
|
690 unset($thisfile_mpeg_audio_lame['long_version']);
|
|
rlm@3
|
691
|
|
rlm@3
|
692 // It the LAME tag was only introduced in LAME v3.90
|
|
rlm@3
|
693 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
|
|
rlm@3
|
694
|
|
rlm@3
|
695 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
|
|
rlm@3
|
696 // are assuming a 'Xing' identifier offset of 0x24, which is the case for
|
|
rlm@3
|
697 // MPEG-1 non-mono, but not for other combinations
|
|
rlm@3
|
698 $lame_tag_offset_contant = $vbr_id_offset - 0x24;
|
|
rlm@3
|
699
|
|
rlm@3
|
700 // shortcuts
|
|
rlm@3
|
701 $thisfile_mpeg_audio_lame['RGAD'] = array ('track'=>array(), 'album'=>array());
|
|
rlm@3
|
702 $thisfile_mpeg_audio_lame_rgad = &$thisfile_mpeg_audio_lame['RGAD'];
|
|
rlm@3
|
703 $thisfile_mpeg_audio_lame_rgad_track = &$thisfile_mpeg_audio_lame_rgad['track'];
|
|
rlm@3
|
704 $thisfile_mpeg_audio_lame_rgad_album = &$thisfile_mpeg_audio_lame_rgad['album'];
|
|
rlm@3
|
705 $thisfile_mpeg_audio_lame['raw'] = array ();
|
|
rlm@3
|
706 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
|
|
rlm@3
|
707
|
|
rlm@3
|
708 // byte $9B VBR Quality
|
|
rlm@3
|
709 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
|
|
rlm@3
|
710 // Actually overwrites original Xing bytes
|
|
rlm@3
|
711 unset($thisfile_mpeg_audio['VBR_scale']);
|
|
rlm@3
|
712 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0x9B, 1));
|
|
rlm@3
|
713
|
|
rlm@3
|
714 // bytes $9C-$A4 Encoder short VersionString
|
|
rlm@3
|
715 $thisfile_mpeg_audio_lame['short_version'] = substr($header_string, $lame_tag_offset_contant + 0x9C, 9);
|
|
rlm@3
|
716
|
|
rlm@3
|
717 // byte $A5 Info Tag revision + VBR method
|
|
rlm@3
|
718 $lame_tagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA5, 1));
|
|
rlm@3
|
719
|
|
rlm@3
|
720 $thisfile_mpeg_audio_lame['tag_revision'] = ($lame_tagRevisionVBRmethod & 0xF0) >> 4;
|
|
rlm@3
|
721 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $lame_tagRevisionVBRmethod & 0x0F;
|
|
rlm@3
|
722 $thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
|
|
rlm@3
|
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'
|
|
rlm@3
|
724
|
|
rlm@3
|
725 // byte $A6 Lowpass filter value
|
|
rlm@3
|
726 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA6, 1)) * 100;
|
|
rlm@3
|
727
|
|
rlm@3
|
728 // bytes $A7-$AE Replay Gain
|
|
rlm@3
|
729 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
|
|
rlm@3
|
730 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
|
|
rlm@3
|
731 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
|
|
rlm@3
|
732 // LAME 3.94a16 and later - 9.23 fixed point
|
|
rlm@3
|
733 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
|
|
rlm@3
|
734 $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA7, 4))) / 8388608);
|
|
rlm@3
|
735 } else {
|
|
rlm@3
|
736 // LAME 3.94a15 and earlier - 32-bit floating point
|
|
rlm@3
|
737 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
|
|
rlm@3
|
738 $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($header_string, $lame_tag_offset_contant + 0xA7, 4));
|
|
rlm@3
|
739 }
|
|
rlm@3
|
740 if ($thisfile_mpeg_audio_lame_rgad['peak_amplitude'] == 0) {
|
|
rlm@3
|
741 unset($thisfile_mpeg_audio_lame_rgad['peak_amplitude']);
|
|
rlm@3
|
742 } else {
|
|
rlm@3
|
743 $thisfile_mpeg_audio_lame_rgad['peak_db'] = 20 * log10($thisfile_mpeg_audio_lame_rgad['peak_amplitude']);
|
|
rlm@3
|
744 }
|
|
rlm@3
|
745
|
|
rlm@3
|
746 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAB, 2));
|
|
rlm@3
|
747 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAD, 2));
|
|
rlm@3
|
748
|
|
rlm@3
|
749
|
|
rlm@3
|
750 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
|
|
rlm@3
|
751
|
|
rlm@3
|
752 $thisfile_mpeg_audio_lame_rgad_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
|
|
rlm@3
|
753 $thisfile_mpeg_audio_lame_rgad_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
|
|
rlm@3
|
754 $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
|
|
rlm@3
|
755 $thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
|
|
rlm@3
|
756 $thisfile_mpeg_audio_lame_rgad_track['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['name']);
|
|
rlm@3
|
757 $thisfile_mpeg_audio_lame_rgad_track['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['originator']);
|
|
rlm@3
|
758 $thisfile_mpeg_audio_lame_rgad_track['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit']);
|
|
rlm@3
|
759
|
|
rlm@3
|
760 if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) {
|
|
rlm@3
|
761 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude'];
|
|
rlm@3
|
762 }
|
|
rlm@3
|
763 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_rgad_track['originator'];
|
|
rlm@3
|
764 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_track['gain_db'];
|
|
rlm@3
|
765 } else {
|
|
rlm@3
|
766 unset($thisfile_mpeg_audio_lame_rgad['track']);
|
|
rlm@3
|
767 }
|
|
rlm@3
|
768 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
|
|
rlm@3
|
769
|
|
rlm@3
|
770 $thisfile_mpeg_audio_lame_rgad_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
|
|
rlm@3
|
771 $thisfile_mpeg_audio_lame_rgad_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
|
|
rlm@3
|
772 $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
|
|
rlm@3
|
773 $thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
|
|
rlm@3
|
774 $thisfile_mpeg_audio_lame_rgad_album['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['name']);
|
|
rlm@3
|
775 $thisfile_mpeg_audio_lame_rgad_album['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['originator']);
|
|
rlm@3
|
776 $thisfile_mpeg_audio_lame_rgad_album['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit']);
|
|
rlm@3
|
777
|
|
rlm@3
|
778 if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) {
|
|
rlm@3
|
779 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude'];
|
|
rlm@3
|
780 }
|
|
rlm@3
|
781 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_rgad_album['originator'];
|
|
rlm@3
|
782 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_album['gain_db'];
|
|
rlm@3
|
783 } else {
|
|
rlm@3
|
784 unset($thisfile_mpeg_audio_lame_rgad['album']);
|
|
rlm@3
|
785 }
|
|
rlm@3
|
786 if (empty($thisfile_mpeg_audio_lame_rgad)) {
|
|
rlm@3
|
787 unset($thisfile_mpeg_audio_lame['RGAD']);
|
|
rlm@3
|
788 }
|
|
rlm@3
|
789
|
|
rlm@3
|
790
|
|
rlm@3
|
791 // byte $AF Encoding flags + ATH Type
|
|
rlm@3
|
792 $encoding_flags_ath_type = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAF, 1));
|
|
rlm@3
|
793 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($encoding_flags_ath_type & 0x10);
|
|
rlm@3
|
794 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($encoding_flags_ath_type & 0x20);
|
|
rlm@3
|
795 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($encoding_flags_ath_type & 0x40);
|
|
rlm@3
|
796 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($encoding_flags_ath_type & 0x80);
|
|
rlm@3
|
797 $thisfile_mpeg_audio_lame['ath_type'] = $encoding_flags_ath_type & 0x0F;
|
|
rlm@3
|
798
|
|
rlm@3
|
799 // byte $B0 if ABR {specified bitrate} else {minimal bitrate}
|
|
rlm@3
|
800 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB0, 1));
|
|
rlm@3
|
801 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
|
|
rlm@3
|
802 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
|
|
rlm@3
|
803 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
|
|
rlm@3
|
804 // ignore
|
|
rlm@3
|
805 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
|
|
rlm@3
|
806 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
|
|
rlm@3
|
807 }
|
|
rlm@3
|
808
|
|
rlm@3
|
809 // bytes $B1-$B3 Encoder delays
|
|
rlm@3
|
810 $encoder_delays = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB1, 3));
|
|
rlm@3
|
811 $thisfile_mpeg_audio_lame['encoder_delay'] = ($encoder_delays & 0xFFF000) >> 12;
|
|
rlm@3
|
812 $thisfile_mpeg_audio_lame['end_padding'] = $encoder_delays & 0x000FFF;
|
|
rlm@3
|
813
|
|
rlm@3
|
814 // byte $B4 Misc
|
|
rlm@3
|
815 $misc_byte = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB4, 1));
|
|
rlm@3
|
816 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($misc_byte & 0x03);
|
|
rlm@3
|
817 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($misc_byte & 0x1C) >> 2;
|
|
rlm@3
|
818 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($misc_byte & 0x20) >> 5;
|
|
rlm@3
|
819 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($misc_byte & 0xC0) >> 6;
|
|
rlm@3
|
820 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
|
|
rlm@3
|
821 $thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
|
|
rlm@3
|
822 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
|
|
rlm@3
|
823 $thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
|
|
rlm@3
|
824
|
|
rlm@3
|
825 // byte $B5 MP3 Gain
|
|
rlm@3
|
826 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB5, 1), false, true);
|
|
rlm@3
|
827 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (20 * log10(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
|
|
rlm@3
|
828 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
|
|
rlm@3
|
829
|
|
rlm@3
|
830 // bytes $B6-$B7 Preset and surround info
|
|
rlm@3
|
831 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB6, 2));
|
|
rlm@3
|
832 // Reserved = ($PresetSurroundBytes & 0xC000);
|
|
rlm@3
|
833 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
|
|
rlm@3
|
834 $thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
|
|
rlm@3
|
835 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
|
|
rlm@3
|
836 $thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
|
|
rlm@3
|
837 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
|
|
rlm@3
|
838 $this->getid3->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');
|
|
rlm@3
|
839 }
|
|
rlm@3
|
840 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
|
|
rlm@3
|
841 // this may change if 3.90.4 ever comes out
|
|
rlm@3
|
842 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
|
|
rlm@3
|
843 }
|
|
rlm@3
|
844
|
|
rlm@3
|
845 // bytes $B8-$BB MusicLength
|
|
rlm@3
|
846 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB8, 4));
|
|
rlm@3
|
847 $expected_number_of_audio_bytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
|
|
rlm@3
|
848
|
|
rlm@3
|
849 // bytes $BC-$BD MusicCRC
|
|
rlm@3
|
850 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBC, 2));
|
|
rlm@3
|
851
|
|
rlm@3
|
852 // bytes $BE-$BF CRC-16 of Info Tag
|
|
rlm@3
|
853 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBE, 2));
|
|
rlm@3
|
854
|
|
rlm@3
|
855
|
|
rlm@3
|
856 // LAME CBR
|
|
rlm@3
|
857 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
|
|
rlm@3
|
858
|
|
rlm@3
|
859 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
|
|
rlm@3
|
860 $thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
|
|
rlm@3
|
861 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
|
|
rlm@3
|
862
|
|
rlm@3
|
863 }
|
|
rlm@3
|
864
|
|
rlm@3
|
865 }
|
|
rlm@3
|
866 }
|
|
rlm@3
|
867
|
|
rlm@3
|
868 } else {
|
|
rlm@3
|
869
|
|
rlm@3
|
870 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
|
|
rlm@3
|
871 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
|
|
rlm@3
|
872 if ($recursive_search) {
|
|
rlm@3
|
873 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
|
|
rlm@3
|
874 if (getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, true)) {
|
|
rlm@3
|
875 $recursive_search = false;
|
|
rlm@3
|
876 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
|
|
rlm@3
|
877 }
|
|
rlm@3
|
878 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
|
|
rlm@3
|
879 $this->getid3->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');
|
|
rlm@3
|
880 }
|
|
rlm@3
|
881 }
|
|
rlm@3
|
882
|
|
rlm@3
|
883 }
|
|
rlm@3
|
884
|
|
rlm@3
|
885 }
|
|
rlm@3
|
886
|
|
rlm@3
|
887 if (($expected_number_of_audio_bytes > 0) && ($expected_number_of_audio_bytes != ($info['avdataend'] - $info['avdataoffset']))) {
|
|
rlm@3
|
888 if ($expected_number_of_audio_bytes > ($info['avdataend'] - $info['avdataoffset'])) {
|
|
rlm@3
|
889 if (($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
|
|
rlm@3
|
890 $this->getid3->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
|
|
rlm@3
|
891 } else {
|
|
rlm@3
|
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'] - $info['avdataoffset'])).' bytes)');
|
|
rlm@3
|
893 }
|
|
rlm@3
|
894 } else {
|
|
rlm@3
|
895 if ((($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes) == 1) {
|
|
rlm@3
|
896 $info['avdataend']--;
|
|
rlm@3
|
897 } else {
|
|
rlm@3
|
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']) - $expected_number_of_audio_bytes).' bytes too many)');
|
|
rlm@3
|
899 }
|
|
rlm@3
|
900 }
|
|
rlm@3
|
901 }
|
|
rlm@3
|
902
|
|
rlm@3
|
903 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
|
|
rlm@3
|
904 if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
|
|
rlm@3
|
905 $frame_byte_length = getid3_mp3::FreeFormatFrameLength($fd, $offset, $info, true);
|
|
rlm@3
|
906 if ($frame_byte_length > 0) {
|
|
rlm@3
|
907 $thisfile_mpeg_audio['framelength'] = $frame_byte_length;
|
|
rlm@3
|
908 if ($thisfile_mpeg_audio['layer'] == '1') {
|
|
rlm@3
|
909 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
|
|
rlm@3
|
910 $info['audio']['bitrate'] = ((($frame_byte_length / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
|
|
rlm@3
|
911 } else {
|
|
rlm@3
|
912 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
|
|
rlm@3
|
913 $info['audio']['bitrate'] = (($frame_byte_length - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
|
|
rlm@3
|
914 }
|
|
rlm@3
|
915 } else {
|
|
rlm@3
|
916
|
|
rlm@3
|
917 // non-fatal error: Error calculating frame length of free-format MP3 without Xing/LAME header.
|
|
rlm@3
|
918 return;
|
|
rlm@3
|
919 }
|
|
rlm@3
|
920 }
|
|
rlm@3
|
921 }
|
|
rlm@3
|
922
|
|
rlm@3
|
923 if (@$thisfile_mpeg_audio['VBR_frames']) {
|
|
rlm@3
|
924 switch ($thisfile_mpeg_audio['bitrate_mode']) {
|
|
rlm@3
|
925 case 'vbr':
|
|
rlm@3
|
926 case 'abr':
|
|
rlm@3
|
927 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
|
|
rlm@3
|
928 $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 384);
|
|
rlm@3
|
929 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
|
|
rlm@3
|
930 $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 576);
|
|
rlm@3
|
931 } else {
|
|
rlm@3
|
932 $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 1152);
|
|
rlm@3
|
933 }
|
|
rlm@3
|
934 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
|
|
rlm@3
|
935 $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
|
|
rlm@3
|
936 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
|
|
rlm@3
|
937 }
|
|
rlm@3
|
938 break;
|
|
rlm@3
|
939 }
|
|
rlm@3
|
940 }
|
|
rlm@3
|
941
|
|
rlm@3
|
942 // End variable-bitrate headers
|
|
rlm@3
|
943 ////////////////////////////////////////////////////////////////////////////////////
|
|
rlm@3
|
944
|
|
rlm@3
|
945 if ($recursive_search) {
|
|
rlm@3
|
946
|
|
rlm@3
|
947 if (!getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, $scan_as_cbr)) {
|
|
rlm@3
|
948 return false;
|
|
rlm@3
|
949 }
|
|
rlm@3
|
950
|
|
rlm@3
|
951 }
|
|
rlm@3
|
952
|
|
rlm@3
|
953 return true;
|
|
rlm@3
|
954 }
|
|
rlm@3
|
955
|
|
rlm@3
|
956
|
|
rlm@3
|
957
|
|
rlm@3
|
958 public function RecursiveFrameScanning(&$fd, &$info, &$offset, &$next_frame_test_offset, $scan_as_cbr) {
|
|
rlm@3
|
959 for ($i = 0; $i < getid3_mp3::VALID_CHECK_FRAMES; $i++) {
|
|
rlm@3
|
960 // check next getid3_mp3::VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
|
|
rlm@3
|
961 if (($next_frame_test_offset + 4) >= $info['avdataend']) {
|
|
rlm@3
|
962 // end of file
|
|
rlm@3
|
963 return true;
|
|
rlm@3
|
964 }
|
|
rlm@3
|
965
|
|
rlm@3
|
966 $next_frame_test_array = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
|
|
rlm@3
|
967 if ($this->decodeMPEGaudioHeader($fd, $next_frame_test_offset, $next_frame_test_array, false)) {
|
|
rlm@3
|
968 if ($scan_as_cbr) {
|
|
rlm@3
|
969 // force CBR mode, used for trying to pick out invalid audio streams with
|
|
rlm@3
|
970 // valid(?) VBR headers, or VBR streams with no VBR header
|
|
rlm@3
|
971 if (!isset($next_frame_test_array['mpeg']['audio']['bitrate']) || !isset($info['mpeg']['audio']['bitrate']) || ($next_frame_test_array['mpeg']['audio']['bitrate'] != $info['mpeg']['audio']['bitrate'])) {
|
|
rlm@3
|
972 return false;
|
|
rlm@3
|
973 }
|
|
rlm@3
|
974 }
|
|
rlm@3
|
975
|
|
rlm@3
|
976
|
|
rlm@3
|
977 // next frame is OK, get ready to check the one after that
|
|
rlm@3
|
978 if (isset($next_frame_test_array['mpeg']['audio']['framelength']) && ($next_frame_test_array['mpeg']['audio']['framelength'] > 0)) {
|
|
rlm@3
|
979 $next_frame_test_offset += $next_frame_test_array['mpeg']['audio']['framelength'];
|
|
rlm@3
|
980 } else {
|
|
rlm@3
|
981
|
|
rlm@3
|
982 // non-fatal error: Frame at offset $offset has an invalid frame length.
|
|
rlm@3
|
983 return;
|
|
rlm@3
|
984 }
|
|
rlm@3
|
985
|
|
rlm@3
|
986 } else {
|
|
rlm@3
|
987
|
|
rlm@3
|
988 // non-fatal error: Next frame is not valid.
|
|
rlm@3
|
989 return;
|
|
rlm@3
|
990 }
|
|
rlm@3
|
991 }
|
|
rlm@3
|
992 return true;
|
|
rlm@3
|
993 }
|
|
rlm@3
|
994
|
|
rlm@3
|
995
|
|
rlm@3
|
996
|
|
rlm@3
|
997 public function FreeFormatFrameLength($fd, $offset, &$info, $deep_scan=false) {
|
|
rlm@3
|
998 fseek($fd, $offset, SEEK_SET);
|
|
rlm@3
|
999 $mpeg_audio_data = fread($fd, 32768);
|
|
rlm@3
|
1000
|
|
rlm@3
|
1001 $sync_pattern1 = substr($mpeg_audio_data, 0, 4);
|
|
rlm@3
|
1002 // may be different pattern due to padding
|
|
rlm@3
|
1003 $sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) | 0x02).$sync_pattern1{3};
|
|
rlm@3
|
1004 if ($sync_pattern2 === $sync_pattern1) {
|
|
rlm@3
|
1005 $sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) & 0xFD).$sync_pattern1{3};
|
|
rlm@3
|
1006 }
|
|
rlm@3
|
1007
|
|
rlm@3
|
1008 $frame_length = false;
|
|
rlm@3
|
1009 $frame_length1 = strpos($mpeg_audio_data, $sync_pattern1, 4);
|
|
rlm@3
|
1010 $frame_length2 = strpos($mpeg_audio_data, $sync_pattern2, 4);
|
|
rlm@3
|
1011 if ($frame_length1 > 4) {
|
|
rlm@3
|
1012 $frame_length = $frame_length1;
|
|
rlm@3
|
1013 }
|
|
rlm@3
|
1014 if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) {
|
|
rlm@3
|
1015 $frame_length = $frame_length2;
|
|
rlm@3
|
1016 }
|
|
rlm@3
|
1017 if (!$frame_length) {
|
|
rlm@3
|
1018
|
|
rlm@3
|
1019 // LAME 3.88 has a different value for modeextension on the first frame vs the rest
|
|
rlm@3
|
1020 $frame_length1 = strpos($mpeg_audio_data, substr($sync_pattern1, 0, 3), 4);
|
|
rlm@3
|
1021 $frame_length2 = strpos($mpeg_audio_data, substr($sync_pattern2, 0, 3), 4);
|
|
rlm@3
|
1022
|
|
rlm@3
|
1023 if ($frame_length1 > 4) {
|
|
rlm@3
|
1024 $frame_length = $frame_length1;
|
|
rlm@3
|
1025 }
|
|
rlm@3
|
1026 if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) {
|
|
rlm@3
|
1027 $frame_length = $frame_length2;
|
|
rlm@3
|
1028 }
|
|
rlm@3
|
1029 if (!$frame_length) {
|
|
rlm@3
|
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);
|
|
rlm@3
|
1031 } else {
|
|
rlm@3
|
1032 $this->getid3->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)');
|
|
rlm@3
|
1033 $info['audio']['codec'] = 'LAME';
|
|
rlm@3
|
1034 $info['audio']['encoder'] = 'LAME3.88';
|
|
rlm@3
|
1035 $sync_pattern1 = substr($sync_pattern1, 0, 3);
|
|
rlm@3
|
1036 $sync_pattern2 = substr($sync_pattern2, 0, 3);
|
|
rlm@3
|
1037 }
|
|
rlm@3
|
1038 }
|
|
rlm@3
|
1039
|
|
rlm@3
|
1040 if ($deep_scan) {
|
|
rlm@3
|
1041
|
|
rlm@3
|
1042 $actual_frame_length_values = array ();
|
|
rlm@3
|
1043 $next_offset = $offset + $frame_length;
|
|
rlm@3
|
1044 while ($next_offset < ($info['avdataend'] - 6)) {
|
|
rlm@3
|
1045 fseek($fd, $next_offset - 1, SEEK_SET);
|
|
rlm@3
|
1046 $NextSyncPattern = fread($fd, 6);
|
|
rlm@3
|
1047 if ((substr($NextSyncPattern, 1, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 1, strlen($sync_pattern2)) == $sync_pattern2)) {
|
|
rlm@3
|
1048 // good - found where expected
|
|
rlm@3
|
1049 $actual_frame_length_values[] = $frame_length;
|
|
rlm@3
|
1050 } elseif ((substr($NextSyncPattern, 0, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 0, strlen($sync_pattern2)) == $sync_pattern2)) {
|
|
rlm@3
|
1051 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
|
|
rlm@3
|
1052 $actual_frame_length_values[] = ($frame_length - 1);
|
|
rlm@3
|
1053 $next_offset--;
|
|
rlm@3
|
1054 } elseif ((substr($NextSyncPattern, 2, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 2, strlen($sync_pattern2)) == $sync_pattern2)) {
|
|
rlm@3
|
1055 // ok - found one byte later than expected (last frame was padded, first frame wasn't)
|
|
rlm@3
|
1056 $actual_frame_length_values[] = ($frame_length + 1);
|
|
rlm@3
|
1057 $next_offset++;
|
|
rlm@3
|
1058 } else {
|
|
rlm@3
|
1059 throw new getid3_exception('Did not find expected free-format sync pattern at offset '.$next_offset);
|
|
rlm@3
|
1060 }
|
|
rlm@3
|
1061 $next_offset += $frame_length;
|
|
rlm@3
|
1062 }
|
|
rlm@3
|
1063 if (count($actual_frame_length_values) > 0) {
|
|
rlm@3
|
1064 $frame_length = intval(round(array_sum($actual_frame_length_values) / count($actual_frame_length_values)));
|
|
rlm@3
|
1065 }
|
|
rlm@3
|
1066 }
|
|
rlm@3
|
1067 return $frame_length;
|
|
rlm@3
|
1068 }
|
|
rlm@3
|
1069
|
|
rlm@3
|
1070
|
|
rlm@3
|
1071
|
|
rlm@3
|
1072 public function getOnlyMPEGaudioInfo($fd, &$info, $avdata_offset, $bit_rate_histogram=false) {
|
|
rlm@3
|
1073
|
|
rlm@3
|
1074 // looks for synch, decodes MPEG audio header
|
|
rlm@3
|
1075
|
|
rlm@3
|
1076 fseek($fd, $avdata_offset, SEEK_SET);
|
|
rlm@3
|
1077
|
|
rlm@3
|
1078 $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdata_offset);
|
|
rlm@3
|
1079 $header = fread($fd, $sync_seek_buffer_size);
|
|
rlm@3
|
1080 $sync_seek_buffer_size = strlen($header);
|
|
rlm@3
|
1081 $synch_seek_offset = 0;
|
|
rlm@3
|
1082
|
|
rlm@3
|
1083 static $mpeg_audio_version_lookup;
|
|
rlm@3
|
1084 static $mpeg_audio_layer_lookup;
|
|
rlm@3
|
1085 static $mpeg_audio_bitrate_lookup;
|
|
rlm@3
|
1086 if (empty($mpeg_audio_version_lookup)) {
|
|
rlm@3
|
1087 $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();
|
|
rlm@3
|
1088 $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();
|
|
rlm@3
|
1089 $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();
|
|
rlm@3
|
1090
|
|
rlm@3
|
1091 }
|
|
rlm@3
|
1092
|
|
rlm@3
|
1093 while ($synch_seek_offset < $sync_seek_buffer_size) {
|
|
rlm@3
|
1094
|
|
rlm@3
|
1095 if ((($avdata_offset + $synch_seek_offset) < $info['avdataend']) && !feof($fd)) {
|
|
rlm@3
|
1096
|
|
rlm@3
|
1097 // if a synch's not found within the first 128k bytes, then give up
|
|
rlm@3
|
1098 if ($synch_seek_offset > $sync_seek_buffer_size) {
|
|
rlm@3
|
1099 throw new getid3_exception('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB');
|
|
rlm@3
|
1100 }
|
|
rlm@3
|
1101
|
|
rlm@3
|
1102 if (feof($fd)) {
|
|
rlm@3
|
1103 throw new getid3_exception('Could not find valid MPEG audio synch before end of file');
|
|
rlm@3
|
1104 }
|
|
rlm@3
|
1105 }
|
|
rlm@3
|
1106
|
|
rlm@3
|
1107 if (($synch_seek_offset + 1) >= strlen($header)) {
|
|
rlm@3
|
1108 throw new getid3_exception('Could not find valid MPEG synch before end of file');
|
|
rlm@3
|
1109 }
|
|
rlm@3
|
1110
|
|
rlm@3
|
1111 if (($header{$synch_seek_offset} == "\xFF") && ($header{($synch_seek_offset + 1)} > "\xE0")) { // synch detected
|
|
rlm@3
|
1112
|
|
rlm@3
|
1113 if (!isset($first_frame_info) && !isset($info['mpeg']['audio'])) {
|
|
rlm@3
|
1114 $first_frame_info = $info;
|
|
rlm@3
|
1115 $first_frame_avdata_offset = $avdata_offset + $synch_seek_offset;
|
|
rlm@3
|
1116 if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $first_frame_info, false)) {
|
|
rlm@3
|
1117 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
|
|
rlm@3
|
1118 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
|
|
rlm@3
|
1119 unset($first_frame_info);
|
|
rlm@3
|
1120 }
|
|
rlm@3
|
1121 }
|
|
rlm@3
|
1122
|
|
rlm@3
|
1123 $dummy = $info; // only overwrite real data if valid header found
|
|
rlm@3
|
1124 if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $dummy, true)) {
|
|
rlm@3
|
1125 $info = $dummy;
|
|
rlm@3
|
1126 $info['avdataoffset'] = $avdata_offset + $synch_seek_offset;
|
|
rlm@3
|
1127
|
|
rlm@3
|
1128 switch (@$info['fileformat']) {
|
|
rlm@3
|
1129 case '':
|
|
rlm@3
|
1130 case 'mp3':
|
|
rlm@3
|
1131 $info['fileformat'] = 'mp3';
|
|
rlm@3
|
1132 $info['audio']['dataformat'] = 'mp3';
|
|
rlm@3
|
1133 break;
|
|
rlm@3
|
1134 }
|
|
rlm@3
|
1135 if (isset($first_frame_info['mpeg']['audio']['bitrate_mode']) && ($first_frame_info['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
|
|
rlm@3
|
1136 if (!(abs($info['audio']['bitrate'] - $first_frame_info['audio']['bitrate']) <= 1)) {
|
|
rlm@3
|
1137 // If there is garbage data between a valid VBR header frame and a sequence
|
|
rlm@3
|
1138 // of valid MPEG-audio frames the VBR data is no longer discarded.
|
|
rlm@3
|
1139 $info = $first_frame_info;
|
|
rlm@3
|
1140 $info['avdataoffset'] = $first_frame_avdata_offset;
|
|
rlm@3
|
1141 $info['fileformat'] = 'mp3';
|
|
rlm@3
|
1142 $info['audio']['dataformat'] = 'mp3';
|
|
rlm@3
|
1143 $dummy = $info;
|
|
rlm@3
|
1144 unset($dummy['mpeg']['audio']);
|
|
rlm@3
|
1145 $GarbageOffsetStart = $first_frame_avdata_offset + $first_frame_info['mpeg']['audio']['framelength'];
|
|
rlm@3
|
1146 $GarbageOffsetEnd = $avdata_offset + $synch_seek_offset;
|
|
rlm@3
|
1147 if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
|
|
rlm@3
|
1148
|
|
rlm@3
|
1149 $info = $dummy;
|
|
rlm@3
|
1150 $info['avdataoffset'] = $GarbageOffsetEnd;
|
|
rlm@3
|
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);
|
|
rlm@3
|
1152
|
|
rlm@3
|
1153 } else {
|
|
rlm@3
|
1154
|
|
rlm@3
|
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 '.$GarbageOffsetEnd.')');
|
|
rlm@3
|
1156
|
|
rlm@3
|
1157 }
|
|
rlm@3
|
1158 }
|
|
rlm@3
|
1159 }
|
|
rlm@3
|
1160 if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
|
|
rlm@3
|
1161 // VBR file with no VBR header
|
|
rlm@3
|
1162 $bit_rate_histogram = true;
|
|
rlm@3
|
1163 }
|
|
rlm@3
|
1164
|
|
rlm@3
|
1165 if ($bit_rate_histogram) {
|
|
rlm@3
|
1166
|
|
rlm@3
|
1167 $info['mpeg']['audio']['stereo_distribution'] = array ('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
|
|
rlm@3
|
1168 $info['mpeg']['audio']['version_distribution'] = array ('1'=>0, '2'=>0, '2.5'=>0);
|
|
rlm@3
|
1169
|
|
rlm@3
|
1170 if ($info['mpeg']['audio']['version'] == '1') {
|
|
rlm@3
|
1171 if ($info['mpeg']['audio']['layer'] == 3) {
|
|
rlm@3
|
1172 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
|
|
rlm@3
|
1173 } elseif ($info['mpeg']['audio']['layer'] == 2) {
|
|
rlm@3
|
1174 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
|
|
rlm@3
|
1175 } elseif ($info['mpeg']['audio']['layer'] == 1) {
|
|
rlm@3
|
1176 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
|
|
rlm@3
|
1177 }
|
|
rlm@3
|
1178 } elseif ($info['mpeg']['audio']['layer'] == 1) {
|
|
rlm@3
|
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);
|
|
rlm@3
|
1180 } else {
|
|
rlm@3
|
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);
|
|
rlm@3
|
1182 }
|
|
rlm@3
|
1183
|
|
rlm@3
|
1184 $dummy = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
|
|
rlm@3
|
1185 $synch_start_offset = $info['avdataoffset'];
|
|
rlm@3
|
1186
|
|
rlm@3
|
1187 $fast_mode = false;
|
|
rlm@3
|
1188 $synch_errors_found = 0;
|
|
rlm@3
|
1189 while ($this->decodeMPEGaudioHeader($fd, $synch_start_offset, $dummy, false, false, $fast_mode)) {
|
|
rlm@3
|
1190 $fast_mode = true;
|
|
rlm@3
|
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']];
|
|
rlm@3
|
1192
|
|
rlm@3
|
1193 if (empty($dummy['mpeg']['audio']['framelength'])) {
|
|
rlm@3
|
1194 $synch_errors_found++;
|
|
rlm@3
|
1195 }
|
|
rlm@3
|
1196 else {
|
|
rlm@3
|
1197 @$info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
|
|
rlm@3
|
1198 @$info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
|
|
rlm@3
|
1199 @$info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
|
|
rlm@3
|
1200
|
|
rlm@3
|
1201 $synch_start_offset += $dummy['mpeg']['audio']['framelength'];
|
|
rlm@3
|
1202 }
|
|
rlm@3
|
1203 }
|
|
rlm@3
|
1204 if ($synch_errors_found > 0) {
|
|
rlm@3
|
1205 $this->getid3->warning('Found '.$synch_errors_found.' synch errors in histogram analysis');
|
|
rlm@3
|
1206 }
|
|
rlm@3
|
1207
|
|
rlm@3
|
1208 $bit_total = 0;
|
|
rlm@3
|
1209 $frame_counter = 0;
|
|
rlm@3
|
1210 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {
|
|
rlm@3
|
1211 $frame_counter += $bit_rate_count;
|
|
rlm@3
|
1212 if ($bit_rate_value != 'free') {
|
|
rlm@3
|
1213 $bit_total += ($bit_rate_value * $bit_rate_count);
|
|
rlm@3
|
1214 }
|
|
rlm@3
|
1215 }
|
|
rlm@3
|
1216 if ($frame_counter == 0) {
|
|
rlm@3
|
1217 throw new getid3_exception('Corrupt MP3 file: framecounter == zero');
|
|
rlm@3
|
1218 }
|
|
rlm@3
|
1219 $info['mpeg']['audio']['frame_count'] = $frame_counter;
|
|
rlm@3
|
1220 $info['mpeg']['audio']['bitrate'] = ($bit_total / $frame_counter);
|
|
rlm@3
|
1221
|
|
rlm@3
|
1222 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
|
|
rlm@3
|
1223
|
|
rlm@3
|
1224
|
|
rlm@3
|
1225 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
|
|
rlm@3
|
1226 $distinct_bit_rates = 0;
|
|
rlm@3
|
1227 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {
|
|
rlm@3
|
1228 if ($bit_rate_count > 0) {
|
|
rlm@3
|
1229 $distinct_bit_rates++;
|
|
rlm@3
|
1230 }
|
|
rlm@3
|
1231 }
|
|
rlm@3
|
1232 if ($distinct_bit_rates > 1) {
|
|
rlm@3
|
1233 $info['mpeg']['audio']['bitrate_mode'] = 'vbr';
|
|
rlm@3
|
1234 } else {
|
|
rlm@3
|
1235 $info['mpeg']['audio']['bitrate_mode'] = 'cbr';
|
|
rlm@3
|
1236 }
|
|
rlm@3
|
1237 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
|
|
rlm@3
|
1238
|
|
rlm@3
|
1239 }
|
|
rlm@3
|
1240
|
|
rlm@3
|
1241 break; // exit while()
|
|
rlm@3
|
1242 }
|
|
rlm@3
|
1243 }
|
|
rlm@3
|
1244
|
|
rlm@3
|
1245 $synch_seek_offset++;
|
|
rlm@3
|
1246 if (($avdata_offset + $synch_seek_offset) >= $info['avdataend']) {
|
|
rlm@3
|
1247 // end of file/data
|
|
rlm@3
|
1248
|
|
rlm@3
|
1249 if (empty($info['mpeg']['audio'])) {
|
|
rlm@3
|
1250
|
|
rlm@3
|
1251 throw new getid3_exception('could not find valid MPEG synch before end of file');
|
|
rlm@3
|
1252 }
|
|
rlm@3
|
1253 break;
|
|
rlm@3
|
1254 }
|
|
rlm@3
|
1255
|
|
rlm@3
|
1256 }
|
|
rlm@3
|
1257
|
|
rlm@3
|
1258 $info['audio']['channels'] = $info['mpeg']['audio']['channels'];
|
|
rlm@3
|
1259 $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
|
|
rlm@3
|
1260 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
|
|
rlm@3
|
1261 return true;
|
|
rlm@3
|
1262 }
|
|
rlm@3
|
1263
|
|
rlm@3
|
1264
|
|
rlm@3
|
1265
|
|
rlm@3
|
1266 public static function MPEGaudioVersionarray() {
|
|
rlm@3
|
1267
|
|
rlm@3
|
1268 static $array = array ('2.5', false, '2', '1');
|
|
rlm@3
|
1269 return $array;
|
|
rlm@3
|
1270 }
|
|
rlm@3
|
1271
|
|
rlm@3
|
1272
|
|
rlm@3
|
1273
|
|
rlm@3
|
1274 public static function MPEGaudioLayerarray() {
|
|
rlm@3
|
1275
|
|
rlm@3
|
1276 static $array = array (false, 3, 2, 1);
|
|
rlm@3
|
1277 return $array;
|
|
rlm@3
|
1278 }
|
|
rlm@3
|
1279
|
|
rlm@3
|
1280
|
|
rlm@3
|
1281
|
|
rlm@3
|
1282 public static function MPEGaudioBitratearray() {
|
|
rlm@3
|
1283
|
|
rlm@3
|
1284 static $array;
|
|
rlm@3
|
1285 if (empty($array)) {
|
|
rlm@3
|
1286 $array = array (
|
|
rlm@3
|
1287 '1' => array (1 => array ('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
|
|
rlm@3
|
1288 2 => array ('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
|
|
rlm@3
|
1289 3 => array ('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
|
|
rlm@3
|
1290 ),
|
|
rlm@3
|
1291
|
|
rlm@3
|
1292 '2' => array (1 => array ('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
|
|
rlm@3
|
1293 2 => array ('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
|
|
rlm@3
|
1294 )
|
|
rlm@3
|
1295 );
|
|
rlm@3
|
1296 $array['2'][3] = $array['2'][2];
|
|
rlm@3
|
1297 $array['2.5'] = $array['2'];
|
|
rlm@3
|
1298 }
|
|
rlm@3
|
1299 return $array;
|
|
rlm@3
|
1300 }
|
|
rlm@3
|
1301
|
|
rlm@3
|
1302
|
|
rlm@3
|
1303
|
|
rlm@3
|
1304 public static function MPEGaudioFrequencyarray() {
|
|
rlm@3
|
1305
|
|
rlm@3
|
1306 static $array = array (
|
|
rlm@3
|
1307 '1' => array (44100, 48000, 32000),
|
|
rlm@3
|
1308 '2' => array (22050, 24000, 16000),
|
|
rlm@3
|
1309 '2.5' => array (11025, 12000, 8000)
|
|
rlm@3
|
1310 );
|
|
rlm@3
|
1311 return $array;
|
|
rlm@3
|
1312 }
|
|
rlm@3
|
1313
|
|
rlm@3
|
1314
|
|
rlm@3
|
1315
|
|
rlm@3
|
1316 public static function MPEGaudioChannelModearray() {
|
|
rlm@3
|
1317
|
|
rlm@3
|
1318 static $array = array ('stereo', 'joint stereo', 'dual channel', 'mono');
|
|
rlm@3
|
1319 return $array;
|
|
rlm@3
|
1320 }
|
|
rlm@3
|
1321
|
|
rlm@3
|
1322
|
|
rlm@3
|
1323
|
|
rlm@3
|
1324 public static function MPEGaudioModeExtensionarray() {
|
|
rlm@3
|
1325
|
|
rlm@3
|
1326 static $array = array (
|
|
rlm@3
|
1327 1 => array ('4-31', '8-31', '12-31', '16-31'),
|
|
rlm@3
|
1328 2 => array ('4-31', '8-31', '12-31', '16-31'),
|
|
rlm@3
|
1329 3 => array ('', 'IS', 'MS', 'IS+MS')
|
|
rlm@3
|
1330 );
|
|
rlm@3
|
1331 return $array;
|
|
rlm@3
|
1332 }
|
|
rlm@3
|
1333
|
|
rlm@3
|
1334
|
|
rlm@3
|
1335
|
|
rlm@3
|
1336 public static function MPEGaudioEmphasisarray() {
|
|
rlm@3
|
1337
|
|
rlm@3
|
1338 static $array = array ('none', '50/15ms', false, 'CCIT J.17');
|
|
rlm@3
|
1339 return $array;
|
|
rlm@3
|
1340 }
|
|
rlm@3
|
1341
|
|
rlm@3
|
1342
|
|
rlm@3
|
1343
|
|
rlm@3
|
1344 public static function MPEGaudioHeaderBytesValid($head4, $allow_bitrate_15=false) {
|
|
rlm@3
|
1345
|
|
rlm@3
|
1346 return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allow_bitrate_15);
|
|
rlm@3
|
1347 }
|
|
rlm@3
|
1348
|
|
rlm@3
|
1349
|
|
rlm@3
|
1350
|
|
rlm@3
|
1351 public static function MPEGaudioHeaderValid($raw_array, $echo_errors=false, $allow_bitrate_15=false) {
|
|
rlm@3
|
1352
|
|
rlm@3
|
1353 if (($raw_array['synch'] & 0x0FFE) != 0x0FFE) {
|
|
rlm@3
|
1354 return false;
|
|
rlm@3
|
1355 }
|
|
rlm@3
|
1356
|
|
rlm@3
|
1357 static $mpeg_audio_version_lookup;
|
|
rlm@3
|
1358 static $mpeg_audio_layer_lookup;
|
|
rlm@3
|
1359 static $mpeg_audio_bitrate_lookup;
|
|
rlm@3
|
1360 static $mpeg_audio_frequency_lookup;
|
|
rlm@3
|
1361 static $mpeg_audio_channel_mode_lookup;
|
|
rlm@3
|
1362 static $mpeg_audio_mode_extension_lookup;
|
|
rlm@3
|
1363 static $mpeg_audio_emphasis_lookup;
|
|
rlm@3
|
1364 if (empty($mpeg_audio_version_lookup)) {
|
|
rlm@3
|
1365 $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();
|
|
rlm@3
|
1366 $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();
|
|
rlm@3
|
1367 $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();
|
|
rlm@3
|
1368 $mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray();
|
|
rlm@3
|
1369 $mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray();
|
|
rlm@3
|
1370 $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray();
|
|
rlm@3
|
1371 $mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray();
|
|
rlm@3
|
1372 }
|
|
rlm@3
|
1373
|
|
rlm@3
|
1374 if (isset($mpeg_audio_version_lookup[$raw_array['version']])) {
|
|
rlm@3
|
1375 $decodedVersion = $mpeg_audio_version_lookup[$raw_array['version']];
|
|
rlm@3
|
1376 } else {
|
|
rlm@3
|
1377 echo ($echo_errors ? "\n".'invalid Version ('.$raw_array['version'].')' : '');
|
|
rlm@3
|
1378 return false;
|
|
rlm@3
|
1379 }
|
|
rlm@3
|
1380 if (isset($mpeg_audio_layer_lookup[$raw_array['layer']])) {
|
|
rlm@3
|
1381 $decodedLayer = $mpeg_audio_layer_lookup[$raw_array['layer']];
|
|
rlm@3
|
1382 } else {
|
|
rlm@3
|
1383 echo ($echo_errors ? "\n".'invalid Layer ('.$raw_array['layer'].')' : '');
|
|
rlm@3
|
1384 return false;
|
|
rlm@3
|
1385 }
|
|
rlm@3
|
1386 if (!isset($mpeg_audio_bitrate_lookup[$decodedVersion][$decodedLayer][$raw_array['bitrate']])) {
|
|
rlm@3
|
1387 echo ($echo_errors ? "\n".'invalid Bitrate ('.$raw_array['bitrate'].')' : '');
|
|
rlm@3
|
1388 if ($raw_array['bitrate'] == 15) {
|
|
rlm@3
|
1389 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
|
|
rlm@3
|
1390 // let it go through here otherwise file will not be identified
|
|
rlm@3
|
1391 if (!$allow_bitrate_15) {
|
|
rlm@3
|
1392 return false;
|
|
rlm@3
|
1393 }
|
|
rlm@3
|
1394 } else {
|
|
rlm@3
|
1395 return false;
|
|
rlm@3
|
1396 }
|
|
rlm@3
|
1397 }
|
|
rlm@3
|
1398 if (!isset($mpeg_audio_frequency_lookup[$decodedVersion][$raw_array['sample_rate']])) {
|
|
rlm@3
|
1399 echo ($echo_errors ? "\n".'invalid Frequency ('.$raw_array['sample_rate'].')' : '');
|
|
rlm@3
|
1400 return false;
|
|
rlm@3
|
1401 }
|
|
rlm@3
|
1402 if (!isset($mpeg_audio_channel_mode_lookup[$raw_array['channelmode']])) {
|
|
rlm@3
|
1403 echo ($echo_errors ? "\n".'invalid ChannelMode ('.$raw_array['channelmode'].')' : '');
|
|
rlm@3
|
1404 return false;
|
|
rlm@3
|
1405 }
|
|
rlm@3
|
1406 if (!isset($mpeg_audio_mode_extension_lookup[$decodedLayer][$raw_array['modeextension']])) {
|
|
rlm@3
|
1407 echo ($echo_errors ? "\n".'invalid Mode Extension ('.$raw_array['modeextension'].')' : '');
|
|
rlm@3
|
1408 return false;
|
|
rlm@3
|
1409 }
|
|
rlm@3
|
1410 if (!isset($mpeg_audio_emphasis_lookup[$raw_array['emphasis']])) {
|
|
rlm@3
|
1411 echo ($echo_errors ? "\n".'invalid Emphasis ('.$raw_array['emphasis'].')' : '');
|
|
rlm@3
|
1412 return false;
|
|
rlm@3
|
1413 }
|
|
rlm@3
|
1414 // These are just either set or not set, you can't mess that up :)
|
|
rlm@3
|
1415 // $raw_array['protection'];
|
|
rlm@3
|
1416 // $raw_array['padding'];
|
|
rlm@3
|
1417 // $raw_array['private'];
|
|
rlm@3
|
1418 // $raw_array['copyright'];
|
|
rlm@3
|
1419 // $raw_array['original'];
|
|
rlm@3
|
1420
|
|
rlm@3
|
1421 return true;
|
|
rlm@3
|
1422 }
|
|
rlm@3
|
1423
|
|
rlm@3
|
1424
|
|
rlm@3
|
1425
|
|
rlm@3
|
1426 public static function MPEGaudioHeaderDecode($header_four_bytes) {
|
|
rlm@3
|
1427 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
|
|
rlm@3
|
1428 // A - Frame sync (all bits set)
|
|
rlm@3
|
1429 // B - MPEG Audio version ID
|
|
rlm@3
|
1430 // C - Layer description
|
|
rlm@3
|
1431 // D - Protection bit
|
|
rlm@3
|
1432 // E - Bitrate index
|
|
rlm@3
|
1433 // F - Sampling rate frequency index
|
|
rlm@3
|
1434 // G - Padding bit
|
|
rlm@3
|
1435 // H - Private bit
|
|
rlm@3
|
1436 // I - Channel Mode
|
|
rlm@3
|
1437 // J - Mode extension (Only if Joint stereo)
|
|
rlm@3
|
1438 // K - Copyright
|
|
rlm@3
|
1439 // L - Original
|
|
rlm@3
|
1440 // M - Emphasis
|
|
rlm@3
|
1441
|
|
rlm@3
|
1442 if (strlen($header_four_bytes) != 4) {
|
|
rlm@3
|
1443 return false;
|
|
rlm@3
|
1444 }
|
|
rlm@3
|
1445
|
|
rlm@3
|
1446 $mpeg_raw_header['synch'] = (getid3_lib::BigEndian2Int(substr($header_four_bytes, 0, 2)) & 0xFFE0) >> 4;
|
|
rlm@3
|
1447 $mpeg_raw_header['version'] = (ord($header_four_bytes{1}) & 0x18) >> 3; // BB
|
|
rlm@3
|
1448 $mpeg_raw_header['layer'] = (ord($header_four_bytes{1}) & 0x06) >> 1; // CC
|
|
rlm@3
|
1449 $mpeg_raw_header['protection'] = (ord($header_four_bytes{1}) & 0x01); // D
|
|
rlm@3
|
1450 $mpeg_raw_header['bitrate'] = (ord($header_four_bytes{2}) & 0xF0) >> 4; // EEEE
|
|
rlm@3
|
1451 $mpeg_raw_header['sample_rate'] = (ord($header_four_bytes{2}) & 0x0C) >> 2; // FF
|
|
rlm@3
|
1452 $mpeg_raw_header['padding'] = (ord($header_four_bytes{2}) & 0x02) >> 1; // G
|
|
rlm@3
|
1453 $mpeg_raw_header['private'] = (ord($header_four_bytes{2}) & 0x01); // H
|
|
rlm@3
|
1454 $mpeg_raw_header['channelmode'] = (ord($header_four_bytes{3}) & 0xC0) >> 6; // II
|
|
rlm@3
|
1455 $mpeg_raw_header['modeextension'] = (ord($header_four_bytes{3}) & 0x30) >> 4; // JJ
|
|
rlm@3
|
1456 $mpeg_raw_header['copyright'] = (ord($header_four_bytes{3}) & 0x08) >> 3; // K
|
|
rlm@3
|
1457 $mpeg_raw_header['original'] = (ord($header_four_bytes{3}) & 0x04) >> 2; // L
|
|
rlm@3
|
1458 $mpeg_raw_header['emphasis'] = (ord($header_four_bytes{3}) & 0x03); // MM
|
|
rlm@3
|
1459
|
|
rlm@3
|
1460 return $mpeg_raw_header;
|
|
rlm@3
|
1461 }
|
|
rlm@3
|
1462
|
|
rlm@3
|
1463
|
|
rlm@3
|
1464
|
|
rlm@3
|
1465 public static function MPEGaudioFrameLength(&$bit_rate, &$version, &$layer, $padding, &$sample_rate) {
|
|
rlm@3
|
1466
|
|
rlm@3
|
1467 if (!isset($cache[$bit_rate][$version][$layer][$padding][$sample_rate])) {
|
|
rlm@3
|
1468 $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = false;
|
|
rlm@3
|
1469 if ($bit_rate != 'free') {
|
|
rlm@3
|
1470
|
|
rlm@3
|
1471 if ($version == '1') {
|
|
rlm@3
|
1472
|
|
rlm@3
|
1473 if ($layer == '1') {
|
|
rlm@3
|
1474
|
|
rlm@3
|
1475 // For Layer I slot is 32 bits long
|
|
rlm@3
|
1476 $frame_length_coefficient = 48;
|
|
rlm@3
|
1477 $slot_length = 4;
|
|
rlm@3
|
1478
|
|
rlm@3
|
1479 } else { // Layer 2 / 3
|
|
rlm@3
|
1480
|
|
rlm@3
|
1481 // for Layer 2 and Layer 3 slot is 8 bits long.
|
|
rlm@3
|
1482 $frame_length_coefficient = 144;
|
|
rlm@3
|
1483 $slot_length = 1;
|
|
rlm@3
|
1484
|
|
rlm@3
|
1485 }
|
|
rlm@3
|
1486
|
|
rlm@3
|
1487 } else { // MPEG-2 / MPEG-2.5
|
|
rlm@3
|
1488
|
|
rlm@3
|
1489 if ($layer == '1') {
|
|
rlm@3
|
1490
|
|
rlm@3
|
1491 // For Layer I slot is 32 bits long
|
|
rlm@3
|
1492 $frame_length_coefficient = 24;
|
|
rlm@3
|
1493 $slot_length = 4;
|
|
rlm@3
|
1494
|
|
rlm@3
|
1495 } elseif ($layer == '2') {
|
|
rlm@3
|
1496
|
|
rlm@3
|
1497 // for Layer 2 and Layer 3 slot is 8 bits long.
|
|
rlm@3
|
1498 $frame_length_coefficient = 144;
|
|
rlm@3
|
1499 $slot_length = 1;
|
|
rlm@3
|
1500
|
|
rlm@3
|
1501 } else { // layer 3
|
|
rlm@3
|
1502
|
|
rlm@3
|
1503 // for Layer 2 and Layer 3 slot is 8 bits long.
|
|
rlm@3
|
1504 $frame_length_coefficient = 72;
|
|
rlm@3
|
1505 $slot_length = 1;
|
|
rlm@3
|
1506
|
|
rlm@3
|
1507 }
|
|
rlm@3
|
1508
|
|
rlm@3
|
1509 }
|
|
rlm@3
|
1510
|
|
rlm@3
|
1511 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
|
|
rlm@3
|
1512 if ($sample_rate > 0) {
|
|
rlm@3
|
1513 $new_frame_length = ($frame_length_coefficient * $bit_rate) / $sample_rate;
|
|
rlm@3
|
1514 $new_frame_length = floor($new_frame_length / $slot_length) * $slot_length; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
|
|
rlm@3
|
1515 if ($padding) {
|
|
rlm@3
|
1516 $new_frame_length += $slot_length;
|
|
rlm@3
|
1517 }
|
|
rlm@3
|
1518 $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = (int) $new_frame_length;
|
|
rlm@3
|
1519 }
|
|
rlm@3
|
1520 }
|
|
rlm@3
|
1521 }
|
|
rlm@3
|
1522 return $cache[$bit_rate][$version][$layer][$padding][$sample_rate];
|
|
rlm@3
|
1523 }
|
|
rlm@3
|
1524
|
|
rlm@3
|
1525
|
|
rlm@3
|
1526
|
|
rlm@3
|
1527 public static function ClosestStandardMP3Bitrate($bit_rate) {
|
|
rlm@3
|
1528
|
|
rlm@3
|
1529 static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
|
|
rlm@3
|
1530 static $bit_rate_table = array (0=>'-');
|
|
rlm@3
|
1531 $round_bit_rate = intval(round($bit_rate, -3));
|
|
rlm@3
|
1532 if (!isset($bit_rate_table[$round_bit_rate])) {
|
|
rlm@3
|
1533 if ($round_bit_rate > 320000) {
|
|
rlm@3
|
1534 $bit_rate_table[$round_bit_rate] = round($bit_rate, -4);
|
|
rlm@3
|
1535 } else {
|
|
rlm@3
|
1536 $last_bit_rate = 320000;
|
|
rlm@3
|
1537 foreach ($standard_bit_rates as $standard_bit_rate) {
|
|
rlm@3
|
1538 $bit_rate_table[$round_bit_rate] = $standard_bit_rate;
|
|
rlm@3
|
1539 if ($round_bit_rate >= $standard_bit_rate - (($last_bit_rate - $standard_bit_rate) / 2)) {
|
|
rlm@3
|
1540 break;
|
|
rlm@3
|
1541 }
|
|
rlm@3
|
1542 $last_bit_rate = $standard_bit_rate;
|
|
rlm@3
|
1543 }
|
|
rlm@3
|
1544 }
|
|
rlm@3
|
1545 }
|
|
rlm@3
|
1546 return $bit_rate_table[$round_bit_rate];
|
|
rlm@3
|
1547 }
|
|
rlm@3
|
1548
|
|
rlm@3
|
1549
|
|
rlm@3
|
1550
|
|
rlm@3
|
1551 public static function XingVBRidOffset($version, $channel_mode) {
|
|
rlm@3
|
1552
|
|
rlm@3
|
1553 static $lookup = array (
|
|
rlm@3
|
1554 '1' => array ('mono' => 0x15, // 4 + 17 = 21
|
|
rlm@3
|
1555 'stereo' => 0x24, // 4 + 32 = 36
|
|
rlm@3
|
1556 'joint stereo' => 0x24,
|
|
rlm@3
|
1557 'dual channel' => 0x24
|
|
rlm@3
|
1558 ),
|
|
rlm@3
|
1559
|
|
rlm@3
|
1560 '2' => array ('mono' => 0x0D, // 4 + 9 = 13
|
|
rlm@3
|
1561 'stereo' => 0x15, // 4 + 17 = 21
|
|
rlm@3
|
1562 'joint stereo' => 0x15,
|
|
rlm@3
|
1563 'dual channel' => 0x15
|
|
rlm@3
|
1564 ),
|
|
rlm@3
|
1565
|
|
rlm@3
|
1566 '2.5' => array ('mono' => 0x15,
|
|
rlm@3
|
1567 'stereo' => 0x15,
|
|
rlm@3
|
1568 'joint stereo' => 0x15,
|
|
rlm@3
|
1569 'dual channel' => 0x15
|
|
rlm@3
|
1570 )
|
|
rlm@3
|
1571 );
|
|
rlm@3
|
1572
|
|
rlm@3
|
1573 return $lookup[$version][$channel_mode];
|
|
rlm@3
|
1574 }
|
|
rlm@3
|
1575
|
|
rlm@3
|
1576
|
|
rlm@3
|
1577
|
|
rlm@3
|
1578 public static function LAMEvbrMethodLookup($vbr_method_id) {
|
|
rlm@3
|
1579
|
|
rlm@3
|
1580 static $lookup = array (
|
|
rlm@3
|
1581 0x00 => 'unknown',
|
|
rlm@3
|
1582 0x01 => 'cbr',
|
|
rlm@3
|
1583 0x02 => 'abr',
|
|
rlm@3
|
1584 0x03 => 'vbr-old / vbr-rh',
|
|
rlm@3
|
1585 0x04 => 'vbr-new / vbr-mtrh',
|
|
rlm@3
|
1586 0x05 => 'vbr-mt',
|
|
rlm@3
|
1587 0x06 => 'Full VBR Method 4',
|
|
rlm@3
|
1588 0x08 => 'constant bitrate 2 pass',
|
|
rlm@3
|
1589 0x09 => 'abr 2 pass',
|
|
rlm@3
|
1590 0x0F => 'reserved'
|
|
rlm@3
|
1591 );
|
|
rlm@3
|
1592 return (isset($lookup[$vbr_method_id]) ? $lookup[$vbr_method_id] : '');
|
|
rlm@3
|
1593 }
|
|
rlm@3
|
1594
|
|
rlm@3
|
1595
|
|
rlm@3
|
1596
|
|
rlm@3
|
1597 public static function LAMEmiscStereoModeLookup($stereo_mode_id) {
|
|
rlm@3
|
1598
|
|
rlm@3
|
1599 static $lookup = array (
|
|
rlm@3
|
1600 0 => 'mono',
|
|
rlm@3
|
1601 1 => 'stereo',
|
|
rlm@3
|
1602 2 => 'dual mono',
|
|
rlm@3
|
1603 3 => 'joint stereo',
|
|
rlm@3
|
1604 4 => 'forced stereo',
|
|
rlm@3
|
1605 5 => 'auto',
|
|
rlm@3
|
1606 6 => 'intensity stereo',
|
|
rlm@3
|
1607 7 => 'other'
|
|
rlm@3
|
1608 );
|
|
rlm@3
|
1609 return (isset($lookup[$stereo_mode_id]) ? $lookup[$stereo_mode_id] : '');
|
|
rlm@3
|
1610 }
|
|
rlm@3
|
1611
|
|
rlm@3
|
1612
|
|
rlm@3
|
1613
|
|
rlm@3
|
1614 public static function LAMEmiscSourceSampleFrequencyLookup($source_sample_frequency_id) {
|
|
rlm@3
|
1615
|
|
rlm@3
|
1616 static $lookup = array (
|
|
rlm@3
|
1617 0 => '<= 32 kHz',
|
|
rlm@3
|
1618 1 => '44.1 kHz',
|
|
rlm@3
|
1619 2 => '48 kHz',
|
|
rlm@3
|
1620 3 => '> 48kHz'
|
|
rlm@3
|
1621 );
|
|
rlm@3
|
1622 return (isset($lookup[$source_sample_frequency_id]) ? $lookup[$source_sample_frequency_id] : '');
|
|
rlm@3
|
1623 }
|
|
rlm@3
|
1624
|
|
rlm@3
|
1625
|
|
rlm@3
|
1626
|
|
rlm@3
|
1627 public static function LAMEsurroundInfoLookup($surround_info_id) {
|
|
rlm@3
|
1628
|
|
rlm@3
|
1629 static $lookup = array (
|
|
rlm@3
|
1630 0 => 'no surround info',
|
|
rlm@3
|
1631 1 => 'DPL encoding',
|
|
rlm@3
|
1632 2 => 'DPL2 encoding',
|
|
rlm@3
|
1633 3 => 'Ambisonic encoding'
|
|
rlm@3
|
1634 );
|
|
rlm@3
|
1635 return (isset($lookup[$surround_info_id]) ? $lookup[$surround_info_id] : 'reserved');
|
|
rlm@3
|
1636 }
|
|
rlm@3
|
1637
|
|
rlm@3
|
1638
|
|
rlm@3
|
1639
|
|
rlm@3
|
1640 public static function LAMEpresetUsedLookup($lame_tag) {
|
|
rlm@3
|
1641
|
|
rlm@3
|
1642 if ($lame_tag['preset_used_id'] == 0) {
|
|
rlm@3
|
1643 // no preset used (LAME >=3.93)
|
|
rlm@3
|
1644 // no preset recorded (LAME <3.93)
|
|
rlm@3
|
1645 return '';
|
|
rlm@3
|
1646 }
|
|
rlm@3
|
1647
|
|
rlm@3
|
1648 $lame_preset_used_lookup = array ();
|
|
rlm@3
|
1649
|
|
rlm@3
|
1650 for ($i = 8; $i <= 320; $i++) {
|
|
rlm@3
|
1651 switch ($lame_tag['vbr_method']) {
|
|
rlm@3
|
1652 case 'cbr':
|
|
rlm@3
|
1653 $lame_preset_used_lookup[$i] = '--alt-preset '.$lame_tag['vbr_method'].' '.$i;
|
|
rlm@3
|
1654 break;
|
|
rlm@3
|
1655 case 'abr':
|
|
rlm@3
|
1656 default: // other VBR modes shouldn't be here(?)
|
|
rlm@3
|
1657 $lame_preset_used_lookup[$i] = '--alt-preset '.$i;
|
|
rlm@3
|
1658 break;
|
|
rlm@3
|
1659 }
|
|
rlm@3
|
1660 }
|
|
rlm@3
|
1661
|
|
rlm@3
|
1662 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
|
|
rlm@3
|
1663
|
|
rlm@3
|
1664 // named alt-presets
|
|
rlm@3
|
1665 $lame_preset_used_lookup[1000] = '--r3mix';
|
|
rlm@3
|
1666 $lame_preset_used_lookup[1001] = '--alt-preset standard';
|
|
rlm@3
|
1667 $lame_preset_used_lookup[1002] = '--alt-preset extreme';
|
|
rlm@3
|
1668 $lame_preset_used_lookup[1003] = '--alt-preset insane';
|
|
rlm@3
|
1669 $lame_preset_used_lookup[1004] = '--alt-preset fast standard';
|
|
rlm@3
|
1670 $lame_preset_used_lookup[1005] = '--alt-preset fast extreme';
|
|
rlm@3
|
1671 $lame_preset_used_lookup[1006] = '--alt-preset medium';
|
|
rlm@3
|
1672 $lame_preset_used_lookup[1007] = '--alt-preset fast medium';
|
|
rlm@3
|
1673
|
|
rlm@3
|
1674 // LAME 3.94 additions/changes
|
|
rlm@3
|
1675 $lame_preset_used_lookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
|
|
rlm@3
|
1676 $lame_preset_used_lookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
|
|
rlm@3
|
1677
|
|
rlm@3
|
1678 $lame_preset_used_lookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
|
|
rlm@3
|
1679 $lame_preset_used_lookup[410] = '-V9';
|
|
rlm@3
|
1680 $lame_preset_used_lookup[420] = '-V8';
|
|
rlm@3
|
1681 $lame_preset_used_lookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
|
|
rlm@3
|
1682 $lame_preset_used_lookup[440] = '-V6';
|
|
rlm@3
|
1683 $lame_preset_used_lookup[450] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
|
|
rlm@3
|
1684 $lame_preset_used_lookup[460] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
|
|
rlm@3
|
1685 $lame_preset_used_lookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
|
|
rlm@3
|
1686 $lame_preset_used_lookup[480] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
|
|
rlm@3
|
1687 $lame_preset_used_lookup[490] = '-V1';
|
|
rlm@3
|
1688 $lame_preset_used_lookup[500] = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
|
|
rlm@3
|
1689
|
|
rlm@3
|
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 info@getid3.org');
|
|
rlm@3
|
1691 }
|
|
rlm@3
|
1692
|
|
rlm@3
|
1693
|
|
rlm@3
|
1694 }
|
|
rlm@3
|
1695
|
|
rlm@3
|
1696 ?> |
