Changeset 41196 for trunk/src/wp-includes/ID3/module.audio.ac3.php
- Timestamp:
- 07/31/2017 07:49:31 PM (8 years ago)
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
trunk/src/wp-includes/ID3/module.audio.ac3.php
r32979 r41196 21 21 private $BSIoffset = 0; 22 22 23 const syncword = "\x0B\x77";23 const syncword = 0x0B77; 24 24 25 25 public function Analyze() { … … 56 56 57 57 $this->fseek($info['avdataoffset']); 58 $this->AC3header['syncinfo'] = $this->fread(5); 59 60 if (strpos($this->AC3header['syncinfo'], self::syncword) === 0) { 61 $thisfile_ac3_raw['synchinfo']['synchword'] = self::syncword; 62 $offset = 2; 63 } else { 58 $tempAC3header = $this->fread(100); // should be enough to cover all data, there are some variable-length fields...? 59 $this->AC3header['syncinfo'] = getid3_lib::BigEndian2Int(substr($tempAC3header, 0, 2)); 60 $this->AC3header['bsi'] = getid3_lib::BigEndian2Bin(substr($tempAC3header, 2)); 61 $thisfile_ac3_raw_bsi['bsid'] = (getid3_lib::LittleEndian2Int(substr($tempAC3header, 5, 1)) & 0xF8) >> 3; // AC3 and E-AC3 put the "bsid" version identifier in the same place, but unfortnately the 4 bytes between the syncword and the version identifier are interpreted differently, so grab it here so the following code structure can make sense 62 unset($tempAC3header); 63 64 if ($this->AC3header['syncinfo'] !== self::syncword) { 64 65 if (!$this->isDependencyFor('matroska')) { 65 66 unset($info['fileformat'], $info['ac3']); 66 return $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($this->AC3header['syncinfo'], 0, 2)).'"'); 67 } 68 $offset = 0; 69 $this->fseek(-2, SEEK_CUR); 67 return $this->error('Expecting "'.dechex(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.dechex($this->AC3header['syncinfo']).'"'); 68 } 70 69 } 71 70 … … 74 73 $info['audio']['lossless'] = false; 75 74 76 $thisfile_ac3_raw['synchinfo']['crc1'] = getid3_lib::LittleEndian2Int(substr($this->AC3header['syncinfo'], $offset, 2)); 77 $ac3_synchinfo_fscod_frmsizecod = getid3_lib::LittleEndian2Int(substr($this->AC3header['syncinfo'], ($offset + 2), 1)); 78 $thisfile_ac3_raw['synchinfo']['fscod'] = ($ac3_synchinfo_fscod_frmsizecod & 0xC0) >> 6; 79 $thisfile_ac3_raw['synchinfo']['frmsizecod'] = ($ac3_synchinfo_fscod_frmsizecod & 0x3F); 80 81 $thisfile_ac3['sample_rate'] = self::sampleRateCodeLookup($thisfile_ac3_raw['synchinfo']['fscod']); 82 if ($thisfile_ac3_raw['synchinfo']['fscod'] <= 3) { 83 $info['audio']['sample_rate'] = $thisfile_ac3['sample_rate']; 84 } 85 86 $thisfile_ac3['frame_length'] = self::frameSizeLookup($thisfile_ac3_raw['synchinfo']['frmsizecod'], $thisfile_ac3_raw['synchinfo']['fscod']); 87 $thisfile_ac3['bitrate'] = self::bitrateLookup($thisfile_ac3_raw['synchinfo']['frmsizecod']); 88 $info['audio']['bitrate'] = $thisfile_ac3['bitrate']; 89 90 $this->AC3header['bsi'] = getid3_lib::BigEndian2Bin($this->fread(15)); 91 $ac3_bsi_offset = 0; 92 93 $thisfile_ac3_raw_bsi['bsid'] = $this->readHeaderBSI(5); 94 if ($thisfile_ac3_raw_bsi['bsid'] > 8) { 95 // Decoders which can decode version 8 will thus be able to decode version numbers less than 8. 96 // If this standard is extended by the addition of additional elements or features, a value of bsid greater than 8 will be used. 97 // Decoders built to this version of the standard will not be able to decode versions with bsid greater than 8. 98 $this->error('Bit stream identification is version '.$thisfile_ac3_raw_bsi['bsid'].', but getID3() only understands up to version 8'); 75 if ($thisfile_ac3_raw_bsi['bsid'] <= 8) { 76 77 $thisfile_ac3_raw_bsi['crc1'] = getid3_lib::Bin2Dec($this->readHeaderBSI(16)); 78 $thisfile_ac3_raw_bsi['fscod'] = $this->readHeaderBSI(2); // 5.4.1.3 79 $thisfile_ac3_raw_bsi['frmsizecod'] = $this->readHeaderBSI(6); // 5.4.1.4 80 if ($thisfile_ac3_raw_bsi['frmsizecod'] > 37) { // binary: 100101 - see Table 5.18 Frame Size Code Table (1 word = 16 bits) 81 $this->warning('Unexpected ac3.bsi.frmsizecod value: '.$thisfile_ac3_raw_bsi['frmsizecod'].', bitrate not set correctly'); 82 } 83 84 $thisfile_ac3_raw_bsi['bsid'] = $this->readHeaderBSI(5); // we already know this from pre-parsing the version identifier, but re-read it to let the bitstream flow as intended 85 $thisfile_ac3_raw_bsi['bsmod'] = $this->readHeaderBSI(3); 86 $thisfile_ac3_raw_bsi['acmod'] = $this->readHeaderBSI(3); 87 88 if ($thisfile_ac3_raw_bsi['acmod'] & 0x01) { 89 // If the lsb of acmod is a 1, center channel is in use and cmixlev follows in the bit stream. 90 $thisfile_ac3_raw_bsi['cmixlev'] = $this->readHeaderBSI(2); 91 $thisfile_ac3['center_mix_level'] = self::centerMixLevelLookup($thisfile_ac3_raw_bsi['cmixlev']); 92 } 93 94 if ($thisfile_ac3_raw_bsi['acmod'] & 0x04) { 95 // If the msb of acmod is a 1, surround channels are in use and surmixlev follows in the bit stream. 96 $thisfile_ac3_raw_bsi['surmixlev'] = $this->readHeaderBSI(2); 97 $thisfile_ac3['surround_mix_level'] = self::surroundMixLevelLookup($thisfile_ac3_raw_bsi['surmixlev']); 98 } 99 100 if ($thisfile_ac3_raw_bsi['acmod'] == 0x02) { 101 // When operating in the two channel mode, this 2-bit code indicates whether or not the program has been encoded in Dolby Surround. 102 $thisfile_ac3_raw_bsi['dsurmod'] = $this->readHeaderBSI(2); 103 $thisfile_ac3['dolby_surround_mode'] = self::dolbySurroundModeLookup($thisfile_ac3_raw_bsi['dsurmod']); 104 } 105 106 $thisfile_ac3_raw_bsi['flags']['lfeon'] = (bool) $this->readHeaderBSI(1); 107 108 // This indicates how far the average dialogue level is below digital 100 percent. Valid values are 1-31. 109 // The value of 0 is reserved. The values of 1 to 31 are interpreted as -1 dB to -31 dB with respect to digital 100 percent. 110 $thisfile_ac3_raw_bsi['dialnorm'] = $this->readHeaderBSI(5); // 5.4.2.8 dialnorm: Dialogue Normalization, 5 Bits 111 112 $thisfile_ac3_raw_bsi['flags']['compr'] = (bool) $this->readHeaderBSI(1); // 5.4.2.9 compre: Compression Gain Word Exists, 1 Bit 113 if ($thisfile_ac3_raw_bsi['flags']['compr']) { 114 $thisfile_ac3_raw_bsi['compr'] = $this->readHeaderBSI(8); // 5.4.2.10 compr: Compression Gain Word, 8 Bits 115 $thisfile_ac3['heavy_compression'] = self::heavyCompression($thisfile_ac3_raw_bsi['compr']); 116 } 117 118 $thisfile_ac3_raw_bsi['flags']['langcod'] = (bool) $this->readHeaderBSI(1); // 5.4.2.11 langcode: Language Code Exists, 1 Bit 119 if ($thisfile_ac3_raw_bsi['flags']['langcod']) { 120 $thisfile_ac3_raw_bsi['langcod'] = $this->readHeaderBSI(8); // 5.4.2.12 langcod: Language Code, 8 Bits 121 } 122 123 $thisfile_ac3_raw_bsi['flags']['audprodinfo'] = (bool) $this->readHeaderBSI(1); // 5.4.2.13 audprodie: Audio Production Information Exists, 1 Bit 124 if ($thisfile_ac3_raw_bsi['flags']['audprodinfo']) { 125 $thisfile_ac3_raw_bsi['mixlevel'] = $this->readHeaderBSI(5); // 5.4.2.14 mixlevel: Mixing Level, 5 Bits 126 $thisfile_ac3_raw_bsi['roomtyp'] = $this->readHeaderBSI(2); // 5.4.2.15 roomtyp: Room Type, 2 Bits 127 128 $thisfile_ac3['mixing_level'] = (80 + $thisfile_ac3_raw_bsi['mixlevel']).'dB'; 129 $thisfile_ac3['room_type'] = self::roomTypeLookup($thisfile_ac3_raw_bsi['roomtyp']); 130 } 131 132 133 $thisfile_ac3_raw_bsi['dialnorm2'] = $this->readHeaderBSI(5); // 5.4.2.16 dialnorm2: Dialogue Normalization, ch2, 5 Bits 134 $thisfile_ac3['dialogue_normalization2'] = '-'.$thisfile_ac3_raw_bsi['dialnorm2'].'dB'; // This indicates how far the average dialogue level is below digital 100 percent. Valid values are 1-31. The value of 0 is reserved. The values of 1 to 31 are interpreted as -1 dB to -31 dB with respect to digital 100 percent. 135 136 $thisfile_ac3_raw_bsi['flags']['compr2'] = (bool) $this->readHeaderBSI(1); // 5.4.2.17 compr2e: Compression Gain Word Exists, ch2, 1 Bit 137 if ($thisfile_ac3_raw_bsi['flags']['compr2']) { 138 $thisfile_ac3_raw_bsi['compr2'] = $this->readHeaderBSI(8); // 5.4.2.18 compr2: Compression Gain Word, ch2, 8 Bits 139 $thisfile_ac3['heavy_compression2'] = self::heavyCompression($thisfile_ac3_raw_bsi['compr2']); 140 } 141 142 $thisfile_ac3_raw_bsi['flags']['langcod2'] = (bool) $this->readHeaderBSI(1); // 5.4.2.19 langcod2e: Language Code Exists, ch2, 1 Bit 143 if ($thisfile_ac3_raw_bsi['flags']['langcod2']) { 144 $thisfile_ac3_raw_bsi['langcod2'] = $this->readHeaderBSI(8); // 5.4.2.20 langcod2: Language Code, ch2, 8 Bits 145 } 146 147 $thisfile_ac3_raw_bsi['flags']['audprodinfo2'] = (bool) $this->readHeaderBSI(1); // 5.4.2.21 audprodi2e: Audio Production Information Exists, ch2, 1 Bit 148 if ($thisfile_ac3_raw_bsi['flags']['audprodinfo2']) { 149 $thisfile_ac3_raw_bsi['mixlevel2'] = $this->readHeaderBSI(5); // 5.4.2.22 mixlevel2: Mixing Level, ch2, 5 Bits 150 $thisfile_ac3_raw_bsi['roomtyp2'] = $this->readHeaderBSI(2); // 5.4.2.23 roomtyp2: Room Type, ch2, 2 Bits 151 152 $thisfile_ac3['mixing_level2'] = (80 + $thisfile_ac3_raw_bsi['mixlevel2']).'dB'; 153 $thisfile_ac3['room_type2'] = self::roomTypeLookup($thisfile_ac3_raw_bsi['roomtyp2']); 154 } 155 156 $thisfile_ac3_raw_bsi['copyright'] = (bool) $this->readHeaderBSI(1); // 5.4.2.24 copyrightb: Copyright Bit, 1 Bit 157 158 $thisfile_ac3_raw_bsi['original'] = (bool) $this->readHeaderBSI(1); // 5.4.2.25 origbs: Original Bit Stream, 1 Bit 159 160 $thisfile_ac3_raw_bsi['flags']['timecod1'] = $this->readHeaderBSI(2); // 5.4.2.26 timecod1e, timcode2e: Time Code (first and second) Halves Exist, 2 Bits 161 if ($thisfile_ac3_raw_bsi['flags']['timecod1'] & 0x01) { 162 $thisfile_ac3_raw_bsi['timecod1'] = $this->readHeaderBSI(14); // 5.4.2.27 timecod1: Time code first half, 14 bits 163 $thisfile_ac3['timecode1'] = 0; 164 $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x3E00) >> 9) * 3600; // The first 5 bits of this 14-bit field represent the time in hours, with valid values of 0�23 165 $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x01F8) >> 3) * 60; // The next 6 bits represent the time in minutes, with valid values of 0�59 166 $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x0003) >> 0) * 8; // The final 3 bits represents the time in 8 second increments, with valid values of 0�7 (representing 0, 8, 16, ... 56 seconds) 167 } 168 if ($thisfile_ac3_raw_bsi['flags']['timecod1'] & 0x02) { 169 $thisfile_ac3_raw_bsi['timecod2'] = $this->readHeaderBSI(14); // 5.4.2.28 timecod2: Time code second half, 14 bits 170 $thisfile_ac3['timecode2'] = 0; 171 $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x3800) >> 11) * 1; // The first 3 bits of this 14-bit field represent the time in seconds, with valid values from 0�7 (representing 0-7 seconds) 172 $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x07C0) >> 6) * (1 / 30); // The next 5 bits represents the time in frames, with valid values from 0�29 (one frame = 1/30th of a second) 173 $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x003F) >> 0) * ((1 / 30) / 60); // The final 6 bits represents fractions of 1/64 of a frame, with valid values from 0�63 174 } 175 176 $thisfile_ac3_raw_bsi['flags']['addbsi'] = (bool) $this->readHeaderBSI(1); 177 if ($thisfile_ac3_raw_bsi['flags']['addbsi']) { 178 $thisfile_ac3_raw_bsi['addbsi_length'] = $this->readHeaderBSI(6) + 1; // This 6-bit code, which exists only if addbside is a 1, indicates the length in bytes of additional bit stream information. The valid range of addbsil is 0�63, indicating 1�64 additional bytes, respectively. 179 180 $this->AC3header['bsi'] .= getid3_lib::BigEndian2Bin($this->fread($thisfile_ac3_raw_bsi['addbsi_length'])); 181 182 $thisfile_ac3_raw_bsi['addbsi_data'] = substr($this->AC3header['bsi'], $this->BSIoffset, $thisfile_ac3_raw_bsi['addbsi_length'] * 8); 183 $this->BSIoffset += $thisfile_ac3_raw_bsi['addbsi_length'] * 8; 184 } 185 186 187 } elseif ($thisfile_ac3_raw_bsi['bsid'] <= 16) { // E-AC3 188 189 190 $this->error('E-AC3 parsing is incomplete and experimental in this version of getID3 ('.$this->getid3->version().'). Notably the bitrate calculations are wrong -- value might (or not) be correct, but it is not calculated correctly. Email info@getid3.org if you know how to calculate EAC3 bitrate correctly.'); 191 $info['audio']['dataformat'] = 'eac3'; 192 193 $thisfile_ac3_raw_bsi['strmtyp'] = $this->readHeaderBSI(2); 194 $thisfile_ac3_raw_bsi['substreamid'] = $this->readHeaderBSI(3); 195 $thisfile_ac3_raw_bsi['frmsiz'] = $this->readHeaderBSI(11); 196 $thisfile_ac3_raw_bsi['fscod'] = $this->readHeaderBSI(2); 197 if ($thisfile_ac3_raw_bsi['fscod'] == 3) { 198 $thisfile_ac3_raw_bsi['fscod2'] = $this->readHeaderBSI(2); 199 $thisfile_ac3_raw_bsi['numblkscod'] = 3; // six blocks per syncframe 200 } else { 201 $thisfile_ac3_raw_bsi['numblkscod'] = $this->readHeaderBSI(2); 202 } 203 $thisfile_ac3['bsi']['blocks_per_sync_frame'] = self::blocksPerSyncFrame($thisfile_ac3_raw_bsi['numblkscod']); 204 $thisfile_ac3_raw_bsi['acmod'] = $this->readHeaderBSI(3); 205 $thisfile_ac3_raw_bsi['flags']['lfeon'] = (bool) $this->readHeaderBSI(1); 206 $thisfile_ac3_raw_bsi['bsid'] = $this->readHeaderBSI(5); // we already know this from pre-parsing the version identifier, but re-read it to let the bitstream flow as intended 207 $thisfile_ac3_raw_bsi['dialnorm'] = $this->readHeaderBSI(5); 208 $thisfile_ac3_raw_bsi['flags']['compr'] = (bool) $this->readHeaderBSI(1); 209 if ($thisfile_ac3_raw_bsi['flags']['compr']) { 210 $thisfile_ac3_raw_bsi['compr'] = $this->readHeaderBSI(8); 211 } 212 if ($thisfile_ac3_raw_bsi['acmod'] == 0) { // if 1+1 mode (dual mono, so some items need a second value) 213 $thisfile_ac3_raw_bsi['dialnorm2'] = $this->readHeaderBSI(5); 214 $thisfile_ac3_raw_bsi['flags']['compr2'] = (bool) $this->readHeaderBSI(1); 215 if ($thisfile_ac3_raw_bsi['flags']['compr2']) { 216 $thisfile_ac3_raw_bsi['compr2'] = $this->readHeaderBSI(8); 217 } 218 } 219 if ($thisfile_ac3_raw_bsi['strmtyp'] == 1) { // if dependent stream 220 $thisfile_ac3_raw_bsi['flags']['chanmap'] = (bool) $this->readHeaderBSI(1); 221 if ($thisfile_ac3_raw_bsi['flags']['chanmap']) { 222 $thisfile_ac3_raw_bsi['chanmap'] = $this->readHeaderBSI(8); 223 } 224 } 225 $thisfile_ac3_raw_bsi['flags']['mixmdat'] = (bool) $this->readHeaderBSI(1); 226 if ($thisfile_ac3_raw_bsi['flags']['mixmdat']) { // Mixing metadata 227 if ($thisfile_ac3_raw_bsi['acmod'] > 2) { // if more than 2 channels 228 $thisfile_ac3_raw_bsi['dmixmod'] = $this->readHeaderBSI(2); 229 } 230 if (($thisfile_ac3_raw_bsi['acmod'] & 0x01) && ($thisfile_ac3_raw_bsi['acmod'] > 2)) { // if three front channels exist 231 $thisfile_ac3_raw_bsi['ltrtcmixlev'] = $this->readHeaderBSI(3); 232 $thisfile_ac3_raw_bsi['lorocmixlev'] = $this->readHeaderBSI(3); 233 } 234 if ($thisfile_ac3_raw_bsi['acmod'] & 0x04) { // if a surround channel exists 235 $thisfile_ac3_raw_bsi['ltrtsurmixlev'] = $this->readHeaderBSI(3); 236 $thisfile_ac3_raw_bsi['lorosurmixlev'] = $this->readHeaderBSI(3); 237 } 238 if ($thisfile_ac3_raw_bsi['flags']['lfeon']) { // if the LFE channel exists 239 $thisfile_ac3_raw_bsi['flags']['lfemixlevcod'] = (bool) $this->readHeaderBSI(1); 240 if ($thisfile_ac3_raw_bsi['flags']['lfemixlevcod']) { 241 $thisfile_ac3_raw_bsi['lfemixlevcod'] = $this->readHeaderBSI(5); 242 } 243 } 244 if ($thisfile_ac3_raw_bsi['strmtyp'] == 0) { // if independent stream 245 $thisfile_ac3_raw_bsi['flags']['pgmscl'] = (bool) $this->readHeaderBSI(1); 246 if ($thisfile_ac3_raw_bsi['flags']['pgmscl']) { 247 $thisfile_ac3_raw_bsi['pgmscl'] = $this->readHeaderBSI(6); 248 } 249 if ($thisfile_ac3_raw_bsi['acmod'] == 0) { // if 1+1 mode (dual mono, so some items need a second value) 250 $thisfile_ac3_raw_bsi['flags']['pgmscl2'] = (bool) $this->readHeaderBSI(1); 251 if ($thisfile_ac3_raw_bsi['flags']['pgmscl2']) { 252 $thisfile_ac3_raw_bsi['pgmscl2'] = $this->readHeaderBSI(6); 253 } 254 } 255 $thisfile_ac3_raw_bsi['flags']['extpgmscl'] = (bool) $this->readHeaderBSI(1); 256 if ($thisfile_ac3_raw_bsi['flags']['extpgmscl']) { 257 $thisfile_ac3_raw_bsi['extpgmscl'] = $this->readHeaderBSI(6); 258 } 259 $thisfile_ac3_raw_bsi['mixdef'] = $this->readHeaderBSI(2); 260 if ($thisfile_ac3_raw_bsi['mixdef'] == 1) { // mixing option 2 261 $thisfile_ac3_raw_bsi['premixcmpsel'] = (bool) $this->readHeaderBSI(1); 262 $thisfile_ac3_raw_bsi['drcsrc'] = (bool) $this->readHeaderBSI(1); 263 $thisfile_ac3_raw_bsi['premixcmpscl'] = $this->readHeaderBSI(3); 264 } elseif ($thisfile_ac3_raw_bsi['mixdef'] == 2) { // mixing option 3 265 $thisfile_ac3_raw_bsi['mixdata'] = $this->readHeaderBSI(12); 266 } elseif ($thisfile_ac3_raw_bsi['mixdef'] == 3) { // mixing option 4 267 $mixdefbitsread = 0; 268 $thisfile_ac3_raw_bsi['mixdeflen'] = $this->readHeaderBSI(5); $mixdefbitsread += 5; 269 $thisfile_ac3_raw_bsi['flags']['mixdata2'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 270 if ($thisfile_ac3_raw_bsi['flags']['mixdata2']) { 271 $thisfile_ac3_raw_bsi['premixcmpsel'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 272 $thisfile_ac3_raw_bsi['drcsrc'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 273 $thisfile_ac3_raw_bsi['premixcmpscl'] = $this->readHeaderBSI(3); $mixdefbitsread += 3; 274 $thisfile_ac3_raw_bsi['flags']['extpgmlscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 275 if ($thisfile_ac3_raw_bsi['flags']['extpgmlscl']) { 276 $thisfile_ac3_raw_bsi['extpgmlscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4; 277 } 278 $thisfile_ac3_raw_bsi['flags']['extpgmcscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 279 if ($thisfile_ac3_raw_bsi['flags']['extpgmcscl']) { 280 $thisfile_ac3_raw_bsi['extpgmcscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4; 281 } 282 $thisfile_ac3_raw_bsi['flags']['extpgmrscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 283 if ($thisfile_ac3_raw_bsi['flags']['extpgmrscl']) { 284 $thisfile_ac3_raw_bsi['extpgmrscl'] = $this->readHeaderBSI(4); 285 } 286 $thisfile_ac3_raw_bsi['flags']['extpgmlsscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 287 if ($thisfile_ac3_raw_bsi['flags']['extpgmlsscl']) { 288 $thisfile_ac3_raw_bsi['extpgmlsscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4; 289 } 290 $thisfile_ac3_raw_bsi['flags']['extpgmrsscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 291 if ($thisfile_ac3_raw_bsi['flags']['extpgmrsscl']) { 292 $thisfile_ac3_raw_bsi['extpgmrsscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4; 293 } 294 $thisfile_ac3_raw_bsi['flags']['extpgmlfescl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 295 if ($thisfile_ac3_raw_bsi['flags']['extpgmlfescl']) { 296 $thisfile_ac3_raw_bsi['extpgmlfescl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4; 297 } 298 $thisfile_ac3_raw_bsi['flags']['dmixscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 299 if ($thisfile_ac3_raw_bsi['flags']['dmixscl']) { 300 $thisfile_ac3_raw_bsi['dmixscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4; 301 } 302 $thisfile_ac3_raw_bsi['flags']['addch'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 303 if ($thisfile_ac3_raw_bsi['flags']['addch']) { 304 $thisfile_ac3_raw_bsi['flags']['extpgmaux1scl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 305 if ($thisfile_ac3_raw_bsi['flags']['extpgmaux1scl']) { 306 $thisfile_ac3_raw_bsi['extpgmaux1scl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4; 307 } 308 $thisfile_ac3_raw_bsi['flags']['extpgmaux2scl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 309 if ($thisfile_ac3_raw_bsi['flags']['extpgmaux2scl']) { 310 $thisfile_ac3_raw_bsi['extpgmaux2scl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4; 311 } 312 } 313 } 314 $thisfile_ac3_raw_bsi['flags']['mixdata3'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 315 if ($thisfile_ac3_raw_bsi['flags']['mixdata3']) { 316 $thisfile_ac3_raw_bsi['spchdat'] = $this->readHeaderBSI(5); $mixdefbitsread += 5; 317 $thisfile_ac3_raw_bsi['flags']['addspchdat'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 318 if ($thisfile_ac3_raw_bsi['flags']['addspchdat']) { 319 $thisfile_ac3_raw_bsi['spchdat1'] = $this->readHeaderBSI(5); $mixdefbitsread += 5; 320 $thisfile_ac3_raw_bsi['spchan1att'] = $this->readHeaderBSI(2); $mixdefbitsread += 2; 321 $thisfile_ac3_raw_bsi['flags']['addspchdat1'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1; 322 if ($thisfile_ac3_raw_bsi['flags']['addspchdat1']) { 323 $thisfile_ac3_raw_bsi['spchdat2'] = $this->readHeaderBSI(5); $mixdefbitsread += 5; 324 $thisfile_ac3_raw_bsi['spchan2att'] = $this->readHeaderBSI(3); $mixdefbitsread += 3; 325 } 326 } 327 } 328 $mixdata_bits = (8 * ($thisfile_ac3_raw_bsi['mixdeflen'] + 2)) - $mixdefbitsread; 329 $mixdata_fill = (($mixdata_bits % 8) ? 8 - ($mixdata_bits % 8) : 0); 330 $thisfile_ac3_raw_bsi['mixdata'] = $this->readHeaderBSI($mixdata_bits); 331 $thisfile_ac3_raw_bsi['mixdatafill'] = $this->readHeaderBSI($mixdata_fill); 332 unset($mixdefbitsread, $mixdata_bits, $mixdata_fill); 333 } 334 if ($thisfile_ac3_raw_bsi['acmod'] < 2) { // if mono or dual mono source 335 $thisfile_ac3_raw_bsi['flags']['paninfo'] = (bool) $this->readHeaderBSI(1); 336 if ($thisfile_ac3_raw_bsi['flags']['paninfo']) { 337 $thisfile_ac3_raw_bsi['panmean'] = $this->readHeaderBSI(8); 338 $thisfile_ac3_raw_bsi['paninfo'] = $this->readHeaderBSI(6); 339 } 340 if ($thisfile_ac3_raw_bsi['acmod'] == 0) { // if 1+1 mode (dual mono, so some items need a second value) 341 $thisfile_ac3_raw_bsi['flags']['paninfo2'] = (bool) $this->readHeaderBSI(1); 342 if ($thisfile_ac3_raw_bsi['flags']['paninfo2']) { 343 $thisfile_ac3_raw_bsi['panmean2'] = $this->readHeaderBSI(8); 344 $thisfile_ac3_raw_bsi['paninfo2'] = $this->readHeaderBSI(6); 345 } 346 } 347 } 348 $thisfile_ac3_raw_bsi['flags']['frmmixcfginfo'] = (bool) $this->readHeaderBSI(1); 349 if ($thisfile_ac3_raw_bsi['flags']['frmmixcfginfo']) { // mixing configuration information 350 if ($thisfile_ac3_raw_bsi['numblkscod'] == 0) { 351 $thisfile_ac3_raw_bsi['blkmixcfginfo'][0] = $this->readHeaderBSI(5); 352 } else { 353 for ($blk = 0; $blk < $thisfile_ac3_raw_bsi['numblkscod']; $blk++) { 354 $thisfile_ac3_raw_bsi['flags']['blkmixcfginfo'.$blk] = (bool) $this->readHeaderBSI(1); 355 if ($thisfile_ac3_raw_bsi['flags']['blkmixcfginfo'.$blk]) { // mixing configuration information 356 $thisfile_ac3_raw_bsi['blkmixcfginfo'][$blk] = $this->readHeaderBSI(5); 357 } 358 } 359 } 360 } 361 } 362 } 363 $thisfile_ac3_raw_bsi['flags']['infomdat'] = (bool) $this->readHeaderBSI(1); 364 if ($thisfile_ac3_raw_bsi['flags']['infomdat']) { // Informational metadata 365 $thisfile_ac3_raw_bsi['bsmod'] = $this->readHeaderBSI(3); 366 $thisfile_ac3_raw_bsi['flags']['copyrightb'] = (bool) $this->readHeaderBSI(1); 367 $thisfile_ac3_raw_bsi['flags']['origbs'] = (bool) $this->readHeaderBSI(1); 368 if ($thisfile_ac3_raw_bsi['acmod'] == 2) { // if in 2/0 mode 369 $thisfile_ac3_raw_bsi['dsurmod'] = $this->readHeaderBSI(2); 370 $thisfile_ac3_raw_bsi['dheadphonmod'] = $this->readHeaderBSI(2); 371 } 372 if ($thisfile_ac3_raw_bsi['acmod'] >= 6) { // if both surround channels exist 373 $thisfile_ac3_raw_bsi['dsurexmod'] = $this->readHeaderBSI(2); 374 } 375 $thisfile_ac3_raw_bsi['flags']['audprodi'] = (bool) $this->readHeaderBSI(1); 376 if ($thisfile_ac3_raw_bsi['flags']['audprodi']) { 377 $thisfile_ac3_raw_bsi['mixlevel'] = $this->readHeaderBSI(5); 378 $thisfile_ac3_raw_bsi['roomtyp'] = $this->readHeaderBSI(2); 379 $thisfile_ac3_raw_bsi['flags']['adconvtyp'] = (bool) $this->readHeaderBSI(1); 380 } 381 if ($thisfile_ac3_raw_bsi['acmod'] == 0) { // if 1+1 mode (dual mono, so some items need a second value) 382 $thisfile_ac3_raw_bsi['flags']['audprodi2'] = (bool) $this->readHeaderBSI(1); 383 if ($thisfile_ac3_raw_bsi['flags']['audprodi2']) { 384 $thisfile_ac3_raw_bsi['mixlevel2'] = $this->readHeaderBSI(5); 385 $thisfile_ac3_raw_bsi['roomtyp2'] = $this->readHeaderBSI(2); 386 $thisfile_ac3_raw_bsi['flags']['adconvtyp2'] = (bool) $this->readHeaderBSI(1); 387 } 388 } 389 if ($thisfile_ac3_raw_bsi['fscod'] < 3) { // if not half sample rate 390 $thisfile_ac3_raw_bsi['flags']['sourcefscod'] = (bool) $this->readHeaderBSI(1); 391 } 392 } 393 if (($thisfile_ac3_raw_bsi['strmtyp'] == 0) && ($thisfile_ac3_raw_bsi['numblkscod'] != 3)) { // if both surround channels exist 394 $thisfile_ac3_raw_bsi['flags']['convsync'] = (bool) $this->readHeaderBSI(1); 395 } 396 if ($thisfile_ac3_raw_bsi['strmtyp'] == 2) { // if bit stream converted from AC-3 397 if ($thisfile_ac3_raw_bsi['numblkscod'] != 3) { // 6 blocks per syncframe 398 $thisfile_ac3_raw_bsi['flags']['blkid'] = 1; 399 } else { 400 $thisfile_ac3_raw_bsi['flags']['blkid'] = (bool) $this->readHeaderBSI(1); 401 } 402 if ($thisfile_ac3_raw_bsi['flags']['blkid']) { 403 $thisfile_ac3_raw_bsi['frmsizecod'] = $this->readHeaderBSI(6); 404 } 405 } 406 $thisfile_ac3_raw_bsi['flags']['addbsi'] = (bool) $this->readHeaderBSI(1); 407 if ($thisfile_ac3_raw_bsi['flags']['addbsi']) { 408 $thisfile_ac3_raw_bsi['addbsil'] = $this->readHeaderBSI(6); 409 $thisfile_ac3_raw_bsi['addbsi'] = $this->readHeaderBSI(($thisfile_ac3_raw_bsi['addbsil'] + 1) * 8); 410 } 411 412 } else { 413 414 $this->error('Bit stream identification is version '.$thisfile_ac3_raw_bsi['bsid'].', but getID3() only understands up to version 16. Please submit a support ticket with a sample file.'); 99 415 unset($info['ac3']); 100 416 return false; 101 } 102 103 $thisfile_ac3_raw_bsi['bsmod'] = $this->readHeaderBSI(3); 104 $thisfile_ac3_raw_bsi['acmod'] = $this->readHeaderBSI(3); 417 418 } 419 420 if (isset($thisfile_ac3_raw_bsi['fscod2'])) { 421 $thisfile_ac3['sample_rate'] = self::sampleRateCodeLookup2($thisfile_ac3_raw_bsi['fscod2']); 422 } else { 423 $thisfile_ac3['sample_rate'] = self::sampleRateCodeLookup($thisfile_ac3_raw_bsi['fscod']); 424 } 425 if ($thisfile_ac3_raw_bsi['fscod'] <= 3) { 426 $info['audio']['sample_rate'] = $thisfile_ac3['sample_rate']; 427 } else { 428 $this->warning('Unexpected ac3.bsi.fscod value: '.$thisfile_ac3_raw_bsi['fscod']); 429 } 430 if (isset($thisfile_ac3_raw_bsi['frmsizecod'])) { 431 $thisfile_ac3['frame_length'] = self::frameSizeLookup($thisfile_ac3_raw_bsi['frmsizecod'], $thisfile_ac3_raw_bsi['fscod']); 432 $thisfile_ac3['bitrate'] = self::bitrateLookup($thisfile_ac3_raw_bsi['frmsizecod']); 433 } elseif (!empty($thisfile_ac3_raw_bsi['frmsiz'])) { 434 // this isn't right, but it's (usually) close, roughly 5% less than it should be. 435 // but WHERE is the actual bitrate value stored in EAC3?? email info@getid3.org if you know! 436 $thisfile_ac3['bitrate'] = ($thisfile_ac3_raw_bsi['frmsiz'] + 1) * 16 * 30; // The frmsiz field shall contain a value one less than the overall size of the coded syncframe in 16-bit words. That is, this field may assume a value ranging from 0 to 2047, and these values correspond to syncframe sizes ranging from 1 to 2048. 437 // kludge-fix to make it approximately the expected value, still not "right": 438 $thisfile_ac3['bitrate'] = round(($thisfile_ac3['bitrate'] * 1.05) / 16000) * 16000; 439 } 440 $info['audio']['bitrate'] = $thisfile_ac3['bitrate']; 105 441 106 442 $thisfile_ac3['service_type'] = self::serviceTypeLookup($thisfile_ac3_raw_bsi['bsmod'], $thisfile_ac3_raw_bsi['acmod']); … … 124 460 $info['audio']['channels'] = $thisfile_ac3['num_channels']; 125 461 126 if ($thisfile_ac3_raw_bsi['acmod'] & 0x01) { 127 // If the lsb of acmod is a 1, center channel is in use and cmixlev follows in the bit stream. 128 $thisfile_ac3_raw_bsi['cmixlev'] = $this->readHeaderBSI(2); 129 $thisfile_ac3['center_mix_level'] = self::centerMixLevelLookup($thisfile_ac3_raw_bsi['cmixlev']); 130 } 131 132 if ($thisfile_ac3_raw_bsi['acmod'] & 0x04) { 133 // If the msb of acmod is a 1, surround channels are in use and surmixlev follows in the bit stream. 134 $thisfile_ac3_raw_bsi['surmixlev'] = $this->readHeaderBSI(2); 135 $thisfile_ac3['surround_mix_level'] = self::surroundMixLevelLookup($thisfile_ac3_raw_bsi['surmixlev']); 136 } 137 138 if ($thisfile_ac3_raw_bsi['acmod'] == 0x02) { 139 // When operating in the two channel mode, this 2-bit code indicates whether or not the program has been encoded in Dolby Surround. 140 $thisfile_ac3_raw_bsi['dsurmod'] = $this->readHeaderBSI(2); 141 $thisfile_ac3['dolby_surround_mode'] = self::dolbySurroundModeLookup($thisfile_ac3_raw_bsi['dsurmod']); 142 } 143 144 $thisfile_ac3_raw_bsi['lfeon'] = (bool) $this->readHeaderBSI(1); 145 $thisfile_ac3['lfe_enabled'] = $thisfile_ac3_raw_bsi['lfeon']; 146 if ($thisfile_ac3_raw_bsi['lfeon']) { 147 //$info['audio']['channels']++; 462 $thisfile_ac3['lfe_enabled'] = $thisfile_ac3_raw_bsi['flags']['lfeon']; 463 if ($thisfile_ac3_raw_bsi['flags']['lfeon']) { 148 464 $info['audio']['channels'] .= '.1'; 149 465 } 150 466 151 $thisfile_ac3['channels_enabled'] = self::channelsEnabledLookup($thisfile_ac3_raw_bsi['acmod'], $thisfile_ac3_raw_bsi['lfeon']); 152 153 // This indicates how far the average dialogue level is below digital 100 percent. Valid values are 1-31. 154 // The value of 0 is reserved. The values of 1 to 31 are interpreted as -1 dB to -31 dB with respect to digital 100 percent. 155 $thisfile_ac3_raw_bsi['dialnorm'] = $this->readHeaderBSI(5); 467 $thisfile_ac3['channels_enabled'] = self::channelsEnabledLookup($thisfile_ac3_raw_bsi['acmod'], $thisfile_ac3_raw_bsi['flags']['lfeon']); 156 468 $thisfile_ac3['dialogue_normalization'] = '-'.$thisfile_ac3_raw_bsi['dialnorm'].'dB'; 157 158 $thisfile_ac3_raw_bsi['compre_flag'] = (bool) $this->readHeaderBSI(1);159 if ($thisfile_ac3_raw_bsi['compre_flag']) {160 $thisfile_ac3_raw_bsi['compr'] = $this->readHeaderBSI(8);161 $thisfile_ac3['heavy_compression'] = self::heavyCompression($thisfile_ac3_raw_bsi['compr']);162 }163 164 $thisfile_ac3_raw_bsi['langcode_flag'] = (bool) $this->readHeaderBSI(1);165 if ($thisfile_ac3_raw_bsi['langcode_flag']) {166 $thisfile_ac3_raw_bsi['langcod'] = $this->readHeaderBSI(8);167 }168 169 $thisfile_ac3_raw_bsi['audprodie'] = (bool) $this->readHeaderBSI(1);170 if ($thisfile_ac3_raw_bsi['audprodie']) {171 $thisfile_ac3_raw_bsi['mixlevel'] = $this->readHeaderBSI(5);172 $thisfile_ac3_raw_bsi['roomtyp'] = $this->readHeaderBSI(2);173 174 $thisfile_ac3['mixing_level'] = (80 + $thisfile_ac3_raw_bsi['mixlevel']).'dB';175 $thisfile_ac3['room_type'] = self::roomTypeLookup($thisfile_ac3_raw_bsi['roomtyp']);176 }177 178 if ($thisfile_ac3_raw_bsi['acmod'] == 0x00) {179 // If acmod is 0, then two completely independent program channels (dual mono)180 // are encoded into the bit stream, and are referenced as Ch1, Ch2. In this case,181 // a number of additional items are present in BSI or audblk to fully describe Ch2.182 183 // This indicates how far the average dialogue level is below digital 100 percent. Valid values are 1-31.184 // The value of 0 is reserved. The values of 1 to 31 are interpreted as -1 dB to -31 dB with respect to digital 100 percent.185 $thisfile_ac3_raw_bsi['dialnorm2'] = $this->readHeaderBSI(5);186 $thisfile_ac3['dialogue_normalization2'] = '-'.$thisfile_ac3_raw_bsi['dialnorm2'].'dB';187 188 $thisfile_ac3_raw_bsi['compre_flag2'] = (bool) $this->readHeaderBSI(1);189 if ($thisfile_ac3_raw_bsi['compre_flag2']) {190 $thisfile_ac3_raw_bsi['compr2'] = $this->readHeaderBSI(8);191 $thisfile_ac3['heavy_compression2'] = self::heavyCompression($thisfile_ac3_raw_bsi['compr2']);192 }193 194 $thisfile_ac3_raw_bsi['langcode_flag2'] = (bool) $this->readHeaderBSI(1);195 if ($thisfile_ac3_raw_bsi['langcode_flag2']) {196 $thisfile_ac3_raw_bsi['langcod2'] = $this->readHeaderBSI(8);197 }198 199 $thisfile_ac3_raw_bsi['audprodie2'] = (bool) $this->readHeaderBSI(1);200 if ($thisfile_ac3_raw_bsi['audprodie2']) {201 $thisfile_ac3_raw_bsi['mixlevel2'] = $this->readHeaderBSI(5);202 $thisfile_ac3_raw_bsi['roomtyp2'] = $this->readHeaderBSI(2);203 204 $thisfile_ac3['mixing_level2'] = (80 + $thisfile_ac3_raw_bsi['mixlevel2']).'dB';205 $thisfile_ac3['room_type2'] = self::roomTypeLookup($thisfile_ac3_raw_bsi['roomtyp2']);206 }207 208 }209 210 $thisfile_ac3_raw_bsi['copyright'] = (bool) $this->readHeaderBSI(1);211 212 $thisfile_ac3_raw_bsi['original'] = (bool) $this->readHeaderBSI(1);213 214 $thisfile_ac3_raw_bsi['timecode1_flag'] = (bool) $this->readHeaderBSI(1);215 if ($thisfile_ac3_raw_bsi['timecode1_flag']) {216 $thisfile_ac3_raw_bsi['timecode1'] = $this->readHeaderBSI(14);217 }218 219 $thisfile_ac3_raw_bsi['timecode2_flag'] = (bool) $this->readHeaderBSI(1);220 if ($thisfile_ac3_raw_bsi['timecode2_flag']) {221 $thisfile_ac3_raw_bsi['timecode2'] = $this->readHeaderBSI(14);222 }223 224 $thisfile_ac3_raw_bsi['addbsi_flag'] = (bool) $this->readHeaderBSI(1);225 if ($thisfile_ac3_raw_bsi['addbsi_flag']) {226 $thisfile_ac3_raw_bsi['addbsi_length'] = $this->readHeaderBSI(6);227 228 $this->AC3header['bsi'] .= getid3_lib::BigEndian2Bin($this->fread($thisfile_ac3_raw_bsi['addbsi_length']));229 230 $thisfile_ac3_raw_bsi['addbsi_data'] = substr($this->AC3header['bsi'], $this->BSIoffset, $thisfile_ac3_raw_bsi['addbsi_length'] * 8);231 $this->BSIoffset += $thisfile_ac3_raw_bsi['addbsi_length'] * 8;232 }233 469 234 470 return true; … … 250 486 ); 251 487 return (isset($sampleRateCodeLookup[$fscod]) ? $sampleRateCodeLookup[$fscod] : false); 488 } 489 490 public static function sampleRateCodeLookup2($fscod2) { 491 static $sampleRateCodeLookup2 = array( 492 0 => 24000, 493 1 => 22050, 494 2 => 16000, 495 3 => 'reserved' // If the reserved code is indicated, the decoder should not attempt to decode audio and should mute. 496 ); 497 return (isset($sampleRateCodeLookup2[$fscod2]) ? $sampleRateCodeLookup2[$fscod2] : false); 252 498 } 253 499 … … 410 656 411 657 public static function frameSizeLookup($frmsizecod, $fscod) { 412 $padding = (bool) ($frmsizecod % 2); 413 $framesizeid = floor($frmsizecod / 2); 658 // LSB is whether padding is used or not 659 $padding = (bool) ($frmsizecod & 0x01); 660 $framesizeid = ($frmsizecod & 0x3E) >> 1; 414 661 415 662 static $frameSizeLookup = array(); 416 663 if (empty($frameSizeLookup)) { 417 664 $frameSizeLookup = array ( 418 0 => array( 128, 138, 192),419 1 => array( 40, 160, 174, 240),420 2 => array( 48, 192, 208, 288),421 3 => array( 56, 224, 242, 336),422 4 => array( 64, 256, 278, 384),423 5 => array( 80, 320, 348, 480),424 6 => array( 96, 384, 416, 576),425 7 => array( 112, 448, 486, 672),426 8 => array( 128, 512, 556, 768),427 9 => array( 160, 640, 696, 960),428 10 => array( 192, 768, 834, 1152),429 11 => array( 224, 896, 974, 1344),430 12 => array( 256, 1024, 1114, 1536),431 13 => array( 320, 1280, 1392, 1920),432 14 => array( 384, 1536, 1670, 2304),433 15 => array( 448, 1792, 1950, 2688),434 16 => array( 512, 2048, 2228, 3072),435 17 => array( 576, 2304, 2506, 3456),436 18 => array( 640, 2560, 2786, 3840)665 0 => array( 128, 138, 192), // 32 kbps 666 1 => array( 160, 174, 240), // 40 kbps 667 2 => array( 192, 208, 288), // 48 kbps 668 3 => array( 224, 242, 336), // 56 kbps 669 4 => array( 256, 278, 384), // 64 kbps 670 5 => array( 320, 348, 480), // 80 kbps 671 6 => array( 384, 416, 576), // 96 kbps 672 7 => array( 448, 486, 672), // 112 kbps 673 8 => array( 512, 556, 768), // 128 kbps 674 9 => array( 640, 696, 960), // 160 kbps 675 10 => array( 768, 834, 1152), // 192 kbps 676 11 => array( 896, 974, 1344), // 224 kbps 677 12 => array(1024, 1114, 1536), // 256 kbps 678 13 => array(1280, 1392, 1920), // 320 kbps 679 14 => array(1536, 1670, 2304), // 384 kbps 680 15 => array(1792, 1950, 2688), // 448 kbps 681 16 => array(2048, 2228, 3072), // 512 kbps 682 17 => array(2304, 2506, 3456), // 576 kbps 683 18 => array(2560, 2786, 3840) // 640 kbps 437 684 ); 438 685 } … … 445 692 446 693 public static function bitrateLookup($frmsizecod) { 447 $framesizeid = floor($frmsizecod / 2); 694 // LSB is whether padding is used or not 695 $padding = (bool) ($frmsizecod & 0x01); 696 $framesizeid = ($frmsizecod & 0x3E) >> 1; 448 697 449 698 static $bitrateLookup = array( 450 0 =>32000,451 1 =>40000,452 2 =>48000,453 3 =>56000,454 4 =>64000,455 5 =>80000,456 6 =>96000,457 7=> 112000,458 8=> 128000,459 9=> 160000,699 0 => 32000, 700 1 => 40000, 701 2 => 48000, 702 3 => 56000, 703 4 => 64000, 704 5 => 80000, 705 6 => 96000, 706 7 => 112000, 707 8 => 128000, 708 9 => 160000, 460 709 10 => 192000, 461 710 11 => 224000, … … 466 715 16 => 512000, 467 716 17 => 576000, 468 18 => 640000 717 18 => 640000, 469 718 ); 470 719 return (isset($bitrateLookup[$framesizeid]) ? $bitrateLookup[$framesizeid] : false); 471 720 } 472 721 722 public static function blocksPerSyncFrame($numblkscod) { 723 static $blocksPerSyncFrameLookup = array( 724 0 => 1, 725 1 => 2, 726 2 => 3, 727 3 => 6, 728 ); 729 return (isset($blocksPerSyncFrameLookup[$numblkscod]) ? $blocksPerSyncFrameLookup[$numblkscod] : false); 730 } 731 473 732 474 733 }
Note: See TracChangeset
for help on using the changeset viewer.