126 lines
6.8 KiB
PHP
126 lines
6.8 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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// also https://github.com/JamesHeinrich/getID3 //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.avr.php //
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// module for analyzing AVR Audio files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_avr extends getid3_handler
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{
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public function Analyze() {
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$info = &$this->getid3->info;
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// http://cui.unige.ch/OSG/info/AudioFormats/ap11.html
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// http://www.btinternet.com/~AnthonyJ/Atari/programming/avr_format.html
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// offset type length name comments
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// ---------------------------------------------------------------------
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// 0 char 4 ID format ID == "2BIT"
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// 4 char 8 name sample name (unused space filled with 0)
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// 12 short 1 mono/stereo 0=mono, -1 (0xFFFF)=stereo
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// With stereo, samples are alternated,
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// the first voice is the left :
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// (LRLRLRLRLRLRLRLRLR...)
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// 14 short 1 resolution 8, 12 or 16 (bits)
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// 16 short 1 signed or not 0=unsigned, -1 (0xFFFF)=signed
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// 18 short 1 loop or not 0=no loop, -1 (0xFFFF)=loop on
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// 20 short 1 MIDI note 0xFFnn, where 0 <= nn <= 127
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// 0xFFFF means "no MIDI note defined"
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// 22 byte 1 Replay speed Frequence in the Replay software
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// 0=5.485 Khz, 1=8.084 Khz, 2=10.971 Khz,
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// 3=16.168 Khz, 4=21.942 Khz, 5=32.336 Khz
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// 6=43.885 Khz, 7=47.261 Khz
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// -1 (0xFF)=no defined Frequence
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// 23 byte 3 sample rate in Hertz
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// 26 long 1 size in bytes (2 * bytes in stereo)
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// 30 long 1 loop begin 0 for no loop
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// 34 long 1 loop size equal to 'size' for no loop
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// 38 short 2 Reserved, MIDI keyboard split */
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// 40 short 2 Reserved, sample compression */
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// 42 short 2 Reserved */
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// 44 char 20; Additional filename space, used if (name[7] != 0)
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// 64 byte 64 user data
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// 128 bytes ? sample data (12 bits samples are coded on 16 bits:
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// 0000 xxxx xxxx xxxx)
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// ---------------------------------------------------------------------
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// Note that all values are in motorola (big-endian) format, and that long is
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// assumed to be 4 bytes, and short 2 bytes.
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// When reading the samples, you should handle both signed and unsigned data,
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// and be prepared to convert 16->8 bit, or mono->stereo if needed. To convert
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// 8-bit data between signed/unsigned just add 127 to the sample values.
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// Simularly for 16-bit data you should add 32769
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$info['fileformat'] = 'avr';
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$this->fseek($info['avdataoffset']);
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$AVRheader = $this->fread(128);
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$info['avr']['raw']['magic'] = substr($AVRheader, 0, 4);
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$magic = '2BIT';
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if ($info['avr']['raw']['magic'] != $magic) {
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$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['avr']['raw']['magic']).'"');
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unset($info['fileformat']);
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unset($info['avr']);
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return false;
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}
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$info['avdataoffset'] += 128;
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$info['avr']['sample_name'] = rtrim(substr($AVRheader, 4, 8));
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$info['avr']['raw']['mono'] = getid3_lib::BigEndian2Int(substr($AVRheader, 12, 2));
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$info['avr']['bits_per_sample'] = getid3_lib::BigEndian2Int(substr($AVRheader, 14, 2));
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$info['avr']['raw']['signed'] = getid3_lib::BigEndian2Int(substr($AVRheader, 16, 2));
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$info['avr']['raw']['loop'] = getid3_lib::BigEndian2Int(substr($AVRheader, 18, 2));
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$info['avr']['raw']['midi'] = getid3_lib::BigEndian2Int(substr($AVRheader, 20, 2));
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$info['avr']['raw']['replay_freq'] = getid3_lib::BigEndian2Int(substr($AVRheader, 22, 1));
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$info['avr']['sample_rate'] = getid3_lib::BigEndian2Int(substr($AVRheader, 23, 3));
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$info['avr']['sample_length'] = getid3_lib::BigEndian2Int(substr($AVRheader, 26, 4));
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$info['avr']['loop_start'] = getid3_lib::BigEndian2Int(substr($AVRheader, 30, 4));
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$info['avr']['loop_end'] = getid3_lib::BigEndian2Int(substr($AVRheader, 34, 4));
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$info['avr']['midi_split'] = getid3_lib::BigEndian2Int(substr($AVRheader, 38, 2));
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$info['avr']['sample_compression'] = getid3_lib::BigEndian2Int(substr($AVRheader, 40, 2));
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$info['avr']['reserved'] = getid3_lib::BigEndian2Int(substr($AVRheader, 42, 2));
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$info['avr']['sample_name_extra'] = rtrim(substr($AVRheader, 44, 20));
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$info['avr']['comment'] = rtrim(substr($AVRheader, 64, 64));
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$info['avr']['flags']['stereo'] = (($info['avr']['raw']['mono'] == 0) ? false : true);
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$info['avr']['flags']['signed'] = (($info['avr']['raw']['signed'] == 0) ? false : true);
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$info['avr']['flags']['loop'] = (($info['avr']['raw']['loop'] == 0) ? false : true);
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$info['avr']['midi_notes'] = array();
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if (($info['avr']['raw']['midi'] & 0xFF00) != 0xFF00) {
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$info['avr']['midi_notes'][] = ($info['avr']['raw']['midi'] & 0xFF00) >> 8;
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}
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if (($info['avr']['raw']['midi'] & 0x00FF) != 0x00FF) {
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$info['avr']['midi_notes'][] = ($info['avr']['raw']['midi'] & 0x00FF);
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}
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if (($info['avdataend'] - $info['avdataoffset']) != ($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 1 : 2))) {
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$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'] - $info['avdataoffset']));
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}
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$info['audio']['dataformat'] = 'avr';
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$info['audio']['lossless'] = true;
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$info['audio']['bitrate_mode'] = 'cbr';
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$info['audio']['bits_per_sample'] = $info['avr']['bits_per_sample'];
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$info['audio']['sample_rate'] = $info['avr']['sample_rate'];
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$info['audio']['channels'] = ($info['avr']['flags']['stereo'] ? 2 : 1);
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$info['playtime_seconds'] = ($info['avr']['sample_length'] / $info['audio']['channels']) / $info['avr']['sample_rate'];
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$info['audio']['bitrate'] = ($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 8 : 16)) / $info['playtime_seconds'];
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return true;
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}
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}
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