1<?php 2 3///////////////////////////////////////////////////////////////// 4/// getID3() by James Heinrich <info@getid3.org> // 5// available at https://github.com/JamesHeinrich/getID3 // 6// or https://www.getid3.org // 7// or http://getid3.sourceforge.net // 8// see readme.txt for more details // 9///////////////////////////////////////////////////////////////// 10// // 11// module.audio.avr.php // 12// module for analyzing AVR Audio files // 13// dependencies: NONE // 14// /// 15///////////////////////////////////////////////////////////////// 16 17if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers 18 exit; 19} 20 21class getid3_avr extends getid3_handler 22{ 23 /** 24 * @return bool 25 */ 26 public function Analyze() { 27 $info = &$this->getid3->info; 28 29 // http://cui.unige.ch/OSG/info/AudioFormats/ap11.html 30 // http://www.btinternet.com/~AnthonyJ/Atari/programming/avr_format.html 31 // offset type length name comments 32 // --------------------------------------------------------------------- 33 // 0 char 4 ID format ID == "2BIT" 34 // 4 char 8 name sample name (unused space filled with 0) 35 // 12 short 1 mono/stereo 0=mono, -1 (0xFFFF)=stereo 36 // With stereo, samples are alternated, 37 // the first voice is the left : 38 // (LRLRLRLRLRLRLRLRLR...) 39 // 14 short 1 resolution 8, 12 or 16 (bits) 40 // 16 short 1 signed or not 0=unsigned, -1 (0xFFFF)=signed 41 // 18 short 1 loop or not 0=no loop, -1 (0xFFFF)=loop on 42 // 20 short 1 MIDI note 0xFFnn, where 0 <= nn <= 127 43 // 0xFFFF means "no MIDI note defined" 44 // 22 byte 1 Replay speed Frequence in the Replay software 45 // 0=5.485 Khz, 1=8.084 Khz, 2=10.971 Khz, 46 // 3=16.168 Khz, 4=21.942 Khz, 5=32.336 Khz 47 // 6=43.885 Khz, 7=47.261 Khz 48 // -1 (0xFF)=no defined Frequence 49 // 23 byte 3 sample rate in Hertz 50 // 26 long 1 size in bytes (2 * bytes in stereo) 51 // 30 long 1 loop begin 0 for no loop 52 // 34 long 1 loop size equal to 'size' for no loop 53 // 38 short 2 Reserved, MIDI keyboard split */ 54 // 40 short 2 Reserved, sample compression */ 55 // 42 short 2 Reserved */ 56 // 44 char 20; Additional filename space, used if (name[7] != 0) 57 // 64 byte 64 user data 58 // 128 bytes ? sample data (12 bits samples are coded on 16 bits: 59 // 0000 xxxx xxxx xxxx) 60 // --------------------------------------------------------------------- 61 62 // Note that all values are in motorola (big-endian) format, and that long is 63 // assumed to be 4 bytes, and short 2 bytes. 64 // When reading the samples, you should handle both signed and unsigned data, 65 // and be prepared to convert 16->8 bit, or mono->stereo if needed. To convert 66 // 8-bit data between signed/unsigned just add 127 to the sample values. 67 // Simularly for 16-bit data you should add 32769 68 69 $info['fileformat'] = 'avr'; 70 71 $this->fseek($info['avdataoffset']); 72 $AVRheader = $this->fread(128); 73 74 $info['avr']['raw']['magic'] = substr($AVRheader, 0, 4); 75 $magic = '2BIT'; 76 if ($info['avr']['raw']['magic'] != $magic) { 77 $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['avr']['raw']['magic']).'"'); 78 unset($info['fileformat']); 79 unset($info['avr']); 80 return false; 81 } 82 $info['avdataoffset'] += 128; 83 84 $info['avr']['sample_name'] = rtrim(substr($AVRheader, 4, 8)); 85 $info['avr']['raw']['mono'] = getid3_lib::BigEndian2Int(substr($AVRheader, 12, 2)); 86 $info['avr']['bits_per_sample'] = getid3_lib::BigEndian2Int(substr($AVRheader, 14, 2)); 87 $info['avr']['raw']['signed'] = getid3_lib::BigEndian2Int(substr($AVRheader, 16, 2)); 88 $info['avr']['raw']['loop'] = getid3_lib::BigEndian2Int(substr($AVRheader, 18, 2)); 89 $info['avr']['raw']['midi'] = getid3_lib::BigEndian2Int(substr($AVRheader, 20, 2)); 90 $info['avr']['raw']['replay_freq'] = getid3_lib::BigEndian2Int(substr($AVRheader, 22, 1)); 91 $info['avr']['sample_rate'] = getid3_lib::BigEndian2Int(substr($AVRheader, 23, 3)); 92 $info['avr']['sample_length'] = getid3_lib::BigEndian2Int(substr($AVRheader, 26, 4)); 93 $info['avr']['loop_start'] = getid3_lib::BigEndian2Int(substr($AVRheader, 30, 4)); 94 $info['avr']['loop_end'] = getid3_lib::BigEndian2Int(substr($AVRheader, 34, 4)); 95 $info['avr']['midi_split'] = getid3_lib::BigEndian2Int(substr($AVRheader, 38, 2)); 96 $info['avr']['sample_compression'] = getid3_lib::BigEndian2Int(substr($AVRheader, 40, 2)); 97 $info['avr']['reserved'] = getid3_lib::BigEndian2Int(substr($AVRheader, 42, 2)); 98 $info['avr']['sample_name_extra'] = rtrim(substr($AVRheader, 44, 20)); 99 $info['avr']['comment'] = rtrim(substr($AVRheader, 64, 64)); 100 101 $info['avr']['flags']['stereo'] = (($info['avr']['raw']['mono'] == 0) ? false : true); 102 $info['avr']['flags']['signed'] = (($info['avr']['raw']['signed'] == 0) ? false : true); 103 $info['avr']['flags']['loop'] = (($info['avr']['raw']['loop'] == 0) ? false : true); 104 105 $info['avr']['midi_notes'] = array(); 106 if (($info['avr']['raw']['midi'] & 0xFF00) != 0xFF00) { 107 $info['avr']['midi_notes'][] = ($info['avr']['raw']['midi'] & 0xFF00) >> 8; 108 } 109 if (($info['avr']['raw']['midi'] & 0x00FF) != 0x00FF) { 110 $info['avr']['midi_notes'][] = ($info['avr']['raw']['midi'] & 0x00FF); 111 } 112 113 if (($info['avdataend'] - $info['avdataoffset']) != ($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 1 : 2))) { 114 $this->warning('Probable truncated file: expecting '.($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 1 : 2)).' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset'])); 115 } 116 117 $info['audio']['dataformat'] = 'avr'; 118 $info['audio']['lossless'] = true; 119 $info['audio']['bitrate_mode'] = 'cbr'; 120 $info['audio']['bits_per_sample'] = $info['avr']['bits_per_sample']; 121 $info['audio']['sample_rate'] = $info['avr']['sample_rate']; 122 $info['audio']['channels'] = ($info['avr']['flags']['stereo'] ? 2 : 1); 123 $info['playtime_seconds'] = ($info['avr']['sample_length'] / $info['audio']['channels']) / $info['avr']['sample_rate']; 124 $info['audio']['bitrate'] = ($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 8 : 16)) / $info['playtime_seconds']; 125 126 127 return true; 128 } 129 130} 131