1 | <?php |
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2 | ///////////////////////////////////////////////////////////////// |
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3 | /// getID3() by James Heinrich <info@getid3.org> // |
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4 | // available at http://getid3.sourceforge.net // |
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5 | // or http://www.getid3.org // |
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6 | ///////////////////////////////////////////////////////////////// |
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7 | // See readme.txt for more details // |
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8 | ///////////////////////////////////////////////////////////////// |
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9 | // // |
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10 | // module.audio.flac.php // |
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11 | // module for analyzing FLAC and OggFLAC audio files // |
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12 | // dependencies: module.audio.ogg.php // |
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13 | // /// |
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14 | ///////////////////////////////////////////////////////////////// |
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15 | |
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16 | |
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17 | getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true); |
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18 | |
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19 | /** |
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20 | * @tutorial http://flac.sourceforge.net/format.html |
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21 | */ |
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22 | class getid3_flac extends getid3_handler |
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23 | { |
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24 | const syncword = 'fLaC'; |
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25 | |
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26 | public function Analyze() { |
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27 | $info = &$this->getid3->info; |
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28 | |
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29 | $this->fseek($info['avdataoffset']); |
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30 | $StreamMarker = $this->fread(4); |
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31 | if ($StreamMarker != self::syncword) { |
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32 | return $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($StreamMarker).'"'); |
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33 | } |
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34 | $info['fileformat'] = 'flac'; |
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35 | $info['audio']['dataformat'] = 'flac'; |
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36 | $info['audio']['bitrate_mode'] = 'vbr'; |
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37 | $info['audio']['lossless'] = true; |
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38 | |
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39 | // parse flac container |
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40 | return $this->parseMETAdata(); |
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41 | } |
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42 | |
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43 | public function parseMETAdata() { |
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44 | $info = &$this->getid3->info; |
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45 | do { |
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46 | $BlockOffset = $this->ftell(); |
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47 | $BlockHeader = $this->fread(4); |
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48 | $LBFBT = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1)); |
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49 | $LastBlockFlag = (bool) ($LBFBT & 0x80); |
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50 | $BlockType = ($LBFBT & 0x7F); |
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51 | $BlockLength = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3)); |
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52 | $BlockTypeText = self::metaBlockTypeLookup($BlockType); |
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53 | |
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54 | if (($BlockOffset + 4 + $BlockLength) > $info['avdataend']) { |
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55 | $this->error('METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockTypeText.') at offset '.$BlockOffset.' extends beyond end of file'); |
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56 | break; |
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57 | } |
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58 | if ($BlockLength < 1) { |
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59 | $this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockLength.') at offset '.$BlockOffset.' is invalid'); |
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60 | break; |
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61 | } |
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62 | |
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63 | $info['flac'][$BlockTypeText]['raw'] = array(); |
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64 | $BlockTypeText_raw = &$info['flac'][$BlockTypeText]['raw']; |
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65 | |
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66 | $BlockTypeText_raw['offset'] = $BlockOffset; |
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67 | $BlockTypeText_raw['last_meta_block'] = $LastBlockFlag; |
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68 | $BlockTypeText_raw['block_type'] = $BlockType; |
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69 | $BlockTypeText_raw['block_type_text'] = $BlockTypeText; |
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70 | $BlockTypeText_raw['block_length'] = $BlockLength; |
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71 | if ($BlockTypeText_raw['block_type'] != 0x06) { // do not read attachment data automatically |
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72 | $BlockTypeText_raw['block_data'] = $this->fread($BlockLength); |
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73 | } |
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74 | |
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75 | switch ($BlockTypeText) { |
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76 | case 'STREAMINFO': // 0x00 |
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77 | if (!$this->parseSTREAMINFO($BlockTypeText_raw['block_data'])) { |
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78 | return false; |
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79 | } |
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80 | break; |
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81 | |
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82 | case 'PADDING': // 0x01 |
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83 | unset($info['flac']['PADDING']); // ignore |
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84 | break; |
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85 | |
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86 | case 'APPLICATION': // 0x02 |
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87 | if (!$this->parseAPPLICATION($BlockTypeText_raw['block_data'])) { |
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88 | return false; |
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89 | } |
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90 | break; |
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91 | |
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92 | case 'SEEKTABLE': // 0x03 |
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93 | if (!$this->parseSEEKTABLE($BlockTypeText_raw['block_data'])) { |
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94 | return false; |
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95 | } |
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96 | break; |
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97 | |
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98 | case 'VORBIS_COMMENT': // 0x04 |
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99 | if (!$this->parseVORBIS_COMMENT($BlockTypeText_raw['block_data'])) { |
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100 | return false; |
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101 | } |
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102 | break; |
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103 | |
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104 | case 'CUESHEET': // 0x05 |
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105 | if (!$this->parseCUESHEET($BlockTypeText_raw['block_data'])) { |
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106 | return false; |
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107 | } |
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108 | break; |
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109 | |
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110 | case 'PICTURE': // 0x06 |
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111 | if (!$this->parsePICTURE()) { |
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112 | return false; |
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113 | } |
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114 | break; |
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115 | |
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116 | default: |
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117 | $this->warning('Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockType.') at offset '.$BlockOffset); |
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118 | } |
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119 | |
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120 | unset($info['flac'][$BlockTypeText]['raw']); |
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121 | $info['avdataoffset'] = $this->ftell(); |
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122 | } |
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123 | while ($LastBlockFlag === false); |
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124 | |
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125 | // handle tags |
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126 | if (!empty($info['flac']['VORBIS_COMMENT']['comments'])) { |
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127 | $info['flac']['comments'] = $info['flac']['VORBIS_COMMENT']['comments']; |
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128 | } |
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129 | if (!empty($info['flac']['VORBIS_COMMENT']['vendor'])) { |
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130 | $info['audio']['encoder'] = str_replace('reference ', '', $info['flac']['VORBIS_COMMENT']['vendor']); |
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131 | } |
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132 | |
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133 | // copy attachments to 'comments' array if nesesary |
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134 | if (isset($info['flac']['PICTURE']) && ($this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE)) { |
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135 | foreach ($info['flac']['PICTURE'] as $entry) { |
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136 | if (!empty($entry['data'])) { |
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137 | $info['flac']['comments']['picture'][] = array('image_mime'=>$entry['image_mime'], 'data'=>$entry['data']); |
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138 | } |
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139 | } |
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140 | } |
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141 | |
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142 | if (isset($info['flac']['STREAMINFO'])) { |
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143 | if (!$this->isDependencyFor('matroska')) { |
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144 | $info['flac']['compressed_audio_bytes'] = $info['avdataend'] - $info['avdataoffset']; |
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145 | } |
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146 | $info['flac']['uncompressed_audio_bytes'] = $info['flac']['STREAMINFO']['samples_stream'] * $info['flac']['STREAMINFO']['channels'] * ($info['flac']['STREAMINFO']['bits_per_sample'] / 8); |
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147 | if ($info['flac']['uncompressed_audio_bytes'] == 0) { |
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148 | return $this->error('Corrupt FLAC file: uncompressed_audio_bytes == zero'); |
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149 | } |
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150 | if (!empty($info['flac']['compressed_audio_bytes'])) { |
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151 | $info['flac']['compression_ratio'] = $info['flac']['compressed_audio_bytes'] / $info['flac']['uncompressed_audio_bytes']; |
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152 | } |
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153 | } |
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154 | |
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155 | // set md5_data_source - built into flac 0.5+ |
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156 | if (isset($info['flac']['STREAMINFO']['audio_signature'])) { |
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157 | |
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158 | if ($info['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) { |
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159 | $this->warning('FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)'); |
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160 | } |
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161 | else { |
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162 | $info['md5_data_source'] = ''; |
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163 | $md5 = $info['flac']['STREAMINFO']['audio_signature']; |
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164 | for ($i = 0; $i < strlen($md5); $i++) { |
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165 | $info['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT); |
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166 | } |
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167 | if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) { |
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168 | unset($info['md5_data_source']); |
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169 | } |
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170 | } |
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171 | } |
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172 | |
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173 | if (isset($info['flac']['STREAMINFO']['bits_per_sample'])) { |
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174 | $info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample']; |
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175 | if ($info['audio']['bits_per_sample'] == 8) { |
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176 | // special case |
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177 | // must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value |
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178 | // MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed |
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179 | $this->warning('FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file'); |
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180 | } |
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181 | } |
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182 | |
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183 | return true; |
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184 | } |
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185 | |
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186 | private function parseSTREAMINFO($BlockData) { |
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187 | $info = &$this->getid3->info; |
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188 | |
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189 | $info['flac']['STREAMINFO'] = array(); |
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190 | $streaminfo = &$info['flac']['STREAMINFO']; |
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191 | |
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192 | $streaminfo['min_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 0, 2)); |
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193 | $streaminfo['max_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 2, 2)); |
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194 | $streaminfo['min_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 4, 3)); |
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195 | $streaminfo['max_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 7, 3)); |
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196 | |
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197 | $SRCSBSS = getid3_lib::BigEndian2Bin(substr($BlockData, 10, 8)); |
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198 | $streaminfo['sample_rate'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 0, 20)); |
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199 | $streaminfo['channels'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 20, 3)) + 1; |
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200 | $streaminfo['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 23, 5)) + 1; |
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201 | $streaminfo['samples_stream'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 28, 36)); |
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202 | |
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203 | $streaminfo['audio_signature'] = substr($BlockData, 18, 16); |
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204 | |
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205 | if (!empty($streaminfo['sample_rate'])) { |
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206 | |
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207 | $info['audio']['bitrate_mode'] = 'vbr'; |
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208 | $info['audio']['sample_rate'] = $streaminfo['sample_rate']; |
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209 | $info['audio']['channels'] = $streaminfo['channels']; |
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210 | $info['audio']['bits_per_sample'] = $streaminfo['bits_per_sample']; |
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211 | $info['playtime_seconds'] = $streaminfo['samples_stream'] / $streaminfo['sample_rate']; |
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212 | if ($info['playtime_seconds'] > 0) { |
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213 | if (!$this->isDependencyFor('matroska')) { |
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214 | $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds']; |
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215 | } |
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216 | else { |
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217 | $this->warning('Cannot determine audio bitrate because total stream size is unknown'); |
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218 | } |
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219 | } |
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220 | |
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221 | } else { |
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222 | return $this->error('Corrupt METAdata block: STREAMINFO'); |
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223 | } |
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224 | |
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225 | return true; |
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226 | } |
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227 | |
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228 | private function parseAPPLICATION($BlockData) { |
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229 | $info = &$this->getid3->info; |
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230 | |
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231 | $ApplicationID = getid3_lib::BigEndian2Int(substr($BlockData, 0, 4)); |
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232 | $info['flac']['APPLICATION'][$ApplicationID]['name'] = self::applicationIDLookup($ApplicationID); |
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233 | $info['flac']['APPLICATION'][$ApplicationID]['data'] = substr($BlockData, 4); |
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234 | |
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235 | return true; |
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236 | } |
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237 | |
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238 | private function parseSEEKTABLE($BlockData) { |
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239 | $info = &$this->getid3->info; |
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240 | |
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241 | $offset = 0; |
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242 | $BlockLength = strlen($BlockData); |
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243 | $placeholderpattern = str_repeat("\xFF", 8); |
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244 | while ($offset < $BlockLength) { |
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245 | $SampleNumberString = substr($BlockData, $offset, 8); |
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246 | $offset += 8; |
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247 | if ($SampleNumberString == $placeholderpattern) { |
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248 | |
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249 | // placeholder point |
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250 | getid3_lib::safe_inc($info['flac']['SEEKTABLE']['placeholders'], 1); |
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251 | $offset += 10; |
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252 | |
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253 | } else { |
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254 | |
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255 | $SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString); |
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256 | $info['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8)); |
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257 | $offset += 8; |
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258 | $info['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 2)); |
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259 | $offset += 2; |
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260 | |
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261 | } |
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262 | } |
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263 | |
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264 | return true; |
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265 | } |
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266 | |
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267 | private function parseVORBIS_COMMENT($BlockData) { |
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268 | $info = &$this->getid3->info; |
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269 | |
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270 | $getid3_ogg = new getid3_ogg($this->getid3); |
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271 | if ($this->isDependencyFor('matroska')) { |
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272 | $getid3_ogg->setStringMode($this->data_string); |
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273 | } |
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274 | $getid3_ogg->ParseVorbisComments(); |
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275 | if (isset($info['ogg'])) { |
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276 | unset($info['ogg']['comments_raw']); |
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277 | $info['flac']['VORBIS_COMMENT'] = $info['ogg']; |
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278 | unset($info['ogg']); |
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279 | } |
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280 | |
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281 | unset($getid3_ogg); |
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282 | |
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283 | return true; |
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284 | } |
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285 | |
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286 | private function parseCUESHEET($BlockData) { |
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287 | $info = &$this->getid3->info; |
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288 | $offset = 0; |
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289 | $info['flac']['CUESHEET']['media_catalog_number'] = trim(substr($BlockData, $offset, 128), "\0"); |
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290 | $offset += 128; |
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291 | $info['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8)); |
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292 | $offset += 8; |
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293 | $info['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)) & 0x80); |
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294 | $offset += 1; |
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295 | |
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296 | $offset += 258; // reserved |
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297 | |
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298 | $info['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); |
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299 | $offset += 1; |
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300 | |
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301 | for ($track = 0; $track < $info['flac']['CUESHEET']['number_tracks']; $track++) { |
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302 | $TrackSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8)); |
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303 | $offset += 8; |
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304 | $TrackNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); |
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305 | $offset += 1; |
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306 | |
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307 | $info['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset; |
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308 | |
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309 | $info['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($BlockData, $offset, 12); |
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310 | $offset += 12; |
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311 | |
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312 | $TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); |
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313 | $offset += 1; |
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314 | $info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80); |
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315 | $info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40); |
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316 | |
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317 | $offset += 13; // reserved |
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318 | |
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319 | $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); |
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320 | $offset += 1; |
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321 | |
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322 | for ($index = 0; $index < $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) { |
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323 | $IndexSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8)); |
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324 | $offset += 8; |
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325 | $IndexNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)); |
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326 | $offset += 1; |
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327 | |
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328 | $offset += 3; // reserved |
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329 | |
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330 | $info['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset; |
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331 | } |
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332 | } |
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333 | |
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334 | return true; |
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335 | } |
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336 | |
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337 | /** |
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338 | * Parse METADATA_BLOCK_PICTURE flac structure and extract attachment |
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339 | * External usage: audio.ogg |
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340 | */ |
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341 | public function parsePICTURE() { |
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342 | $info = &$this->getid3->info; |
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343 | |
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344 | $picture['typeid'] = getid3_lib::BigEndian2Int($this->fread(4)); |
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345 | $picture['type'] = self::pictureTypeLookup($picture['typeid']); |
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346 | $picture['image_mime'] = $this->fread(getid3_lib::BigEndian2Int($this->fread(4))); |
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347 | $descr_length = getid3_lib::BigEndian2Int($this->fread(4)); |
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348 | if ($descr_length) { |
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349 | $picture['description'] = $this->fread($descr_length); |
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350 | } |
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351 | $picture['width'] = getid3_lib::BigEndian2Int($this->fread(4)); |
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352 | $picture['height'] = getid3_lib::BigEndian2Int($this->fread(4)); |
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353 | $picture['color_depth'] = getid3_lib::BigEndian2Int($this->fread(4)); |
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354 | $picture['colors_indexed'] = getid3_lib::BigEndian2Int($this->fread(4)); |
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355 | $data_length = getid3_lib::BigEndian2Int($this->fread(4)); |
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356 | |
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357 | if ($picture['image_mime'] == '-->') { |
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358 | $picture['data'] = $this->fread($data_length); |
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359 | } else { |
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360 | $picture['data'] = $this->saveAttachment( |
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361 | str_replace('/', '_', $picture['type']).'_'.$this->ftell(), |
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362 | $this->ftell(), |
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363 | $data_length, |
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364 | $picture['image_mime']); |
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365 | } |
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366 | |
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367 | $info['flac']['PICTURE'][] = $picture; |
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368 | |
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369 | return true; |
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370 | } |
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371 | |
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372 | public static function metaBlockTypeLookup($blocktype) { |
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373 | static $lookup = array( |
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374 | 0 => 'STREAMINFO', |
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375 | 1 => 'PADDING', |
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376 | 2 => 'APPLICATION', |
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377 | 3 => 'SEEKTABLE', |
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378 | 4 => 'VORBIS_COMMENT', |
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379 | 5 => 'CUESHEET', |
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380 | 6 => 'PICTURE', |
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381 | ); |
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382 | return (isset($lookup[$blocktype]) ? $lookup[$blocktype] : 'reserved'); |
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383 | } |
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384 | |
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385 | public static function applicationIDLookup($applicationid) { |
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386 | // http://flac.sourceforge.net/id.html |
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387 | static $lookup = array( |
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388 | 0x41544348 => 'FlacFile', // "ATCH" |
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389 | 0x42534F4C => 'beSolo', // "BSOL" |
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390 | 0x42554753 => 'Bugs Player', // "BUGS" |
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391 | 0x43756573 => 'GoldWave cue points (specification)', // "Cues" |
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392 | 0x46696361 => 'CUE Splitter', // "Fica" |
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393 | 0x46746F6C => 'flac-tools', // "Ftol" |
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394 | 0x4D4F5442 => 'MOTB MetaCzar', // "MOTB" |
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395 | 0x4D505345 => 'MP3 Stream Editor', // "MPSE" |
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396 | 0x4D754D4C => 'MusicML: Music Metadata Language', // "MuML" |
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397 | 0x52494646 => 'Sound Devices RIFF chunk storage', // "RIFF" |
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398 | 0x5346464C => 'Sound Font FLAC', // "SFFL" |
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399 | 0x534F4E59 => 'Sony Creative Software', // "SONY" |
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400 | 0x5351455A => 'flacsqueeze', // "SQEZ" |
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401 | 0x54745776 => 'TwistedWave', // "TtWv" |
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402 | 0x55495453 => 'UITS Embedding tools', // "UITS" |
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403 | 0x61696666 => 'FLAC AIFF chunk storage', // "aiff" |
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404 | 0x696D6167 => 'flac-image application for storing arbitrary files in APPLICATION metadata blocks', // "imag" |
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405 | 0x7065656D => 'Parseable Embedded Extensible Metadata (specification)', // "peem" |
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406 | 0x71667374 => 'QFLAC Studio', // "qfst" |
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407 | 0x72696666 => 'FLAC RIFF chunk storage', // "riff" |
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408 | 0x74756E65 => 'TagTuner', // "tune" |
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409 | 0x78626174 => 'XBAT', // "xbat" |
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410 | 0x786D6364 => 'xmcd', // "xmcd" |
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411 | ); |
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412 | return (isset($lookup[$applicationid]) ? $lookup[$applicationid] : 'reserved'); |
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413 | } |
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414 | |
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415 | public static function pictureTypeLookup($type_id) { |
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416 | static $lookup = array ( |
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417 | 0 => 'Other', |
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418 | 1 => '32x32 pixels \'file icon\' (PNG only)', |
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419 | 2 => 'Other file icon', |
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420 | 3 => 'Cover (front)', |
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421 | 4 => 'Cover (back)', |
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422 | 5 => 'Leaflet page', |
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423 | 6 => 'Media (e.g. label side of CD)', |
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424 | 7 => 'Lead artist/lead performer/soloist', |
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425 | 8 => 'Artist/performer', |
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426 | 9 => 'Conductor', |
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427 | 10 => 'Band/Orchestra', |
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428 | 11 => 'Composer', |
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429 | 12 => 'Lyricist/text writer', |
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430 | 13 => 'Recording Location', |
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431 | 14 => 'During recording', |
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432 | 15 => 'During performance', |
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433 | 16 => 'Movie/video screen capture', |
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434 | 17 => 'A bright coloured fish', |
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435 | 18 => 'Illustration', |
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436 | 19 => 'Band/artist logotype', |
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437 | 20 => 'Publisher/Studio logotype', |
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438 | ); |
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439 | return (isset($lookup[$type_id]) ? $lookup[$type_id] : 'reserved'); |
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440 | } |
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441 | |
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442 | } |
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