File indexing completed on 2024-05-12 17:26:00
0001 <?php 0002 ///////////////////////////////////////////////////////////////// 0003 /// getID3() by James Heinrich <info@getid3.org> // 0004 // available at http://getid3.sourceforge.net // 0005 // or http://www.getid3.org // 0006 // also https://github.com/JamesHeinrich/getID3 // 0007 ///////////////////////////////////////////////////////////////// 0008 // See readme.txt for more details // 0009 ///////////////////////////////////////////////////////////////// 0010 // // 0011 // module.audio.tta.php // 0012 // module for analyzing TTA Audio files // 0013 // dependencies: NONE // 0014 // /// 0015 ///////////////////////////////////////////////////////////////// 0016 0017 0018 class getid3_tta extends getid3_handler 0019 { 0020 0021 public function Analyze() { 0022 $info = &$this->getid3->info; 0023 0024 $info['fileformat'] = 'tta'; 0025 $info['audio']['dataformat'] = 'tta'; 0026 $info['audio']['lossless'] = true; 0027 $info['audio']['bitrate_mode'] = 'vbr'; 0028 0029 $this->fseek($info['avdataoffset']); 0030 $ttaheader = $this->fread(26); 0031 0032 $info['tta']['magic'] = substr($ttaheader, 0, 3); 0033 $magic = 'TTA'; 0034 if ($info['tta']['magic'] != $magic) { 0035 $info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['tta']['magic']).'"'; 0036 unset($info['fileformat']); 0037 unset($info['audio']); 0038 unset($info['tta']); 0039 return false; 0040 } 0041 0042 switch ($ttaheader{3}) { 0043 case "\x01": // TTA v1.x 0044 case "\x02": // TTA v1.x 0045 case "\x03": // TTA v1.x 0046 // "It was the demo-version of the TTA encoder. There is no released format with such header. TTA encoder v1 is not supported about a year." 0047 $info['tta']['major_version'] = 1; 0048 $info['avdataoffset'] += 16; 0049 0050 $info['tta']['compression_level'] = ord($ttaheader{3}); 0051 $info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2)); 0052 $info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2)); 0053 $info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 4)); 0054 $info['tta']['samples_per_channel'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12, 4)); 0055 0056 $info['audio']['encoder_options'] = '-e'.$info['tta']['compression_level']; 0057 $info['playtime_seconds'] = $info['tta']['samples_per_channel'] / $info['tta']['sample_rate']; 0058 break; 0059 0060 case '2': // TTA v2.x 0061 // "I have hurried to release the TTA 2.0 encoder. Format documentation is removed from our site. This format still in development. Please wait the TTA2 format, encoder v4." 0062 $info['tta']['major_version'] = 2; 0063 $info['avdataoffset'] += 20; 0064 0065 $info['tta']['compression_level'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2)); 0066 $info['tta']['audio_format'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2)); 0067 $info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 2)); 0068 $info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 10, 2)); 0069 $info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12, 4)); 0070 $info['tta']['data_length'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 16, 4)); 0071 0072 $info['audio']['encoder_options'] = '-e'.$info['tta']['compression_level']; 0073 $info['playtime_seconds'] = $info['tta']['data_length'] / $info['tta']['sample_rate']; 0074 break; 0075 0076 case '1': // TTA v3.x 0077 // "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher." 0078 $info['tta']['major_version'] = 3; 0079 $info['avdataoffset'] += 26; 0080 0081 $info['tta']['audio_format'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2)); // getid3_riff::wFormatTagLookup() 0082 $info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2)); 0083 $info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 2)); 0084 $info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 10, 4)); 0085 $info['tta']['data_length'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 14, 4)); 0086 $info['tta']['crc32_footer'] = substr($ttaheader, 18, 4); 0087 $info['tta']['seek_point'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 22, 4)); 0088 0089 $info['playtime_seconds'] = $info['tta']['data_length'] / $info['tta']['sample_rate']; 0090 break; 0091 0092 default: 0093 $info['error'][] = 'This version of getID3() ['.$this->getid3->version().'] only knows how to handle TTA v1 and v2 - it may not work correctly with this file which appears to be TTA v'.$ttaheader{3}; 0094 return false; 0095 break; 0096 } 0097 0098 $info['audio']['encoder'] = 'TTA v'.$info['tta']['major_version']; 0099 $info['audio']['bits_per_sample'] = $info['tta']['bits_per_sample']; 0100 $info['audio']['sample_rate'] = $info['tta']['sample_rate']; 0101 $info['audio']['channels'] = $info['tta']['channels']; 0102 $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds']; 0103 0104 return true; 0105 } 0106 0107 }