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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.avr.php // 0012 // module for analyzing AVR Audio files // 0013 // dependencies: NONE // 0014 // /// 0015 ///////////////////////////////////////////////////////////////// 0016 0017 0018 class getid3_avr extends getid3_handler 0019 { 0020 0021 public function Analyze() { 0022 $info = &$this->getid3->info; 0023 0024 // http://cui.unige.ch/OSG/info/AudioFormats/ap11.html 0025 // http://www.btinternet.com/~AnthonyJ/Atari/programming/avr_format.html 0026 // offset type length name comments 0027 // --------------------------------------------------------------------- 0028 // 0 char 4 ID format ID == "2BIT" 0029 // 4 char 8 name sample name (unused space filled with 0) 0030 // 12 short 1 mono/stereo 0=mono, -1 (0xFFFF)=stereo 0031 // With stereo, samples are alternated, 0032 // the first voice is the left : 0033 // (LRLRLRLRLRLRLRLRLR...) 0034 // 14 short 1 resolution 8, 12 or 16 (bits) 0035 // 16 short 1 signed or not 0=unsigned, -1 (0xFFFF)=signed 0036 // 18 short 1 loop or not 0=no loop, -1 (0xFFFF)=loop on 0037 // 20 short 1 MIDI note 0xFFnn, where 0 <= nn <= 127 0038 // 0xFFFF means "no MIDI note defined" 0039 // 22 byte 1 Replay speed Frequence in the Replay software 0040 // 0=5.485 Khz, 1=8.084 Khz, 2=10.971 Khz, 0041 // 3=16.168 Khz, 4=21.942 Khz, 5=32.336 Khz 0042 // 6=43.885 Khz, 7=47.261 Khz 0043 // -1 (0xFF)=no defined Frequence 0044 // 23 byte 3 sample rate in Hertz 0045 // 26 long 1 size in bytes (2 * bytes in stereo) 0046 // 30 long 1 loop begin 0 for no loop 0047 // 34 long 1 loop size equal to 'size' for no loop 0048 // 38 short 2 Reserved, MIDI keyboard split */ 0049 // 40 short 2 Reserved, sample compression */ 0050 // 42 short 2 Reserved */ 0051 // 44 char 20; Additional filename space, used if (name[7] != 0) 0052 // 64 byte 64 user data 0053 // 128 bytes ? sample data (12 bits samples are coded on 16 bits: 0054 // 0000 xxxx xxxx xxxx) 0055 // --------------------------------------------------------------------- 0056 0057 // Note that all values are in motorola (big-endian) format, and that long is 0058 // assumed to be 4 bytes, and short 2 bytes. 0059 // When reading the samples, you should handle both signed and unsigned data, 0060 // and be prepared to convert 16->8 bit, or mono->stereo if needed. To convert 0061 // 8-bit data between signed/unsigned just add 127 to the sample values. 0062 // Simularly for 16-bit data you should add 32769 0063 0064 $info['fileformat'] = 'avr'; 0065 0066 $this->fseek($info['avdataoffset']); 0067 $AVRheader = $this->fread(128); 0068 0069 $info['avr']['raw']['magic'] = substr($AVRheader, 0, 4); 0070 $magic = '2BIT'; 0071 if ($info['avr']['raw']['magic'] != $magic) { 0072 $info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['avr']['raw']['magic']).'"'; 0073 unset($info['fileformat']); 0074 unset($info['avr']); 0075 return false; 0076 } 0077 $info['avdataoffset'] += 128; 0078 0079 $info['avr']['sample_name'] = rtrim(substr($AVRheader, 4, 8)); 0080 $info['avr']['raw']['mono'] = getid3_lib::BigEndian2Int(substr($AVRheader, 12, 2)); 0081 $info['avr']['bits_per_sample'] = getid3_lib::BigEndian2Int(substr($AVRheader, 14, 2)); 0082 $info['avr']['raw']['signed'] = getid3_lib::BigEndian2Int(substr($AVRheader, 16, 2)); 0083 $info['avr']['raw']['loop'] = getid3_lib::BigEndian2Int(substr($AVRheader, 18, 2)); 0084 $info['avr']['raw']['midi'] = getid3_lib::BigEndian2Int(substr($AVRheader, 20, 2)); 0085 $info['avr']['raw']['replay_freq'] = getid3_lib::BigEndian2Int(substr($AVRheader, 22, 1)); 0086 $info['avr']['sample_rate'] = getid3_lib::BigEndian2Int(substr($AVRheader, 23, 3)); 0087 $info['avr']['sample_length'] = getid3_lib::BigEndian2Int(substr($AVRheader, 26, 4)); 0088 $info['avr']['loop_start'] = getid3_lib::BigEndian2Int(substr($AVRheader, 30, 4)); 0089 $info['avr']['loop_end'] = getid3_lib::BigEndian2Int(substr($AVRheader, 34, 4)); 0090 $info['avr']['midi_split'] = getid3_lib::BigEndian2Int(substr($AVRheader, 38, 2)); 0091 $info['avr']['sample_compression'] = getid3_lib::BigEndian2Int(substr($AVRheader, 40, 2)); 0092 $info['avr']['reserved'] = getid3_lib::BigEndian2Int(substr($AVRheader, 42, 2)); 0093 $info['avr']['sample_name_extra'] = rtrim(substr($AVRheader, 44, 20)); 0094 $info['avr']['comment'] = rtrim(substr($AVRheader, 64, 64)); 0095 0096 $info['avr']['flags']['stereo'] = (($info['avr']['raw']['mono'] == 0) ? false : true); 0097 $info['avr']['flags']['signed'] = (($info['avr']['raw']['signed'] == 0) ? false : true); 0098 $info['avr']['flags']['loop'] = (($info['avr']['raw']['loop'] == 0) ? false : true); 0099 0100 $info['avr']['midi_notes'] = array(); 0101 if (($info['avr']['raw']['midi'] & 0xFF00) != 0xFF00) { 0102 $info['avr']['midi_notes'][] = ($info['avr']['raw']['midi'] & 0xFF00) >> 8; 0103 } 0104 if (($info['avr']['raw']['midi'] & 0x00FF) != 0x00FF) { 0105 $info['avr']['midi_notes'][] = ($info['avr']['raw']['midi'] & 0x00FF); 0106 } 0107 0108 if (($info['avdataend'] - $info['avdataoffset']) != ($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 1 : 2))) { 0109 $info['warning'][] = 'Probable truncated file: expecting '.($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 1 : 2)).' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']); 0110 } 0111 0112 $info['audio']['dataformat'] = 'avr'; 0113 $info['audio']['lossless'] = true; 0114 $info['audio']['bitrate_mode'] = 'cbr'; 0115 $info['audio']['bits_per_sample'] = $info['avr']['bits_per_sample']; 0116 $info['audio']['sample_rate'] = $info['avr']['sample_rate']; 0117 $info['audio']['channels'] = ($info['avr']['flags']['stereo'] ? 2 : 1); 0118 $info['playtime_seconds'] = ($info['avr']['sample_length'] / $info['audio']['channels']) / $info['avr']['sample_rate']; 0119 $info['audio']['bitrate'] = ($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 8 : 16)) / $info['playtime_seconds']; 0120 0121 0122 return true; 0123 } 0124 0125 }