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Diffstat (limited to 'includes/getid3/module.audio.avr.php')
| -rw-r--r-- | includes/getid3/module.audio.avr.php | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/includes/getid3/module.audio.avr.php b/includes/getid3/module.audio.avr.php new file mode 100644 index 0000000..69a2605 --- /dev/null +++ b/includes/getid3/module.audio.avr.php @@ -0,0 +1,130 @@ +<?php + +///////////////////////////////////////////////////////////////// +/// getID3() by James Heinrich <info@getid3.org> // +// available at https://github.com/JamesHeinrich/getID3 // +// or https://www.getid3.org // +// or http://getid3.sourceforge.net // +// see readme.txt for more details // +///////////////////////////////////////////////////////////////// +// // +// module.audio.avr.php // +// module for analyzing AVR Audio files // +// dependencies: NONE // +// /// +///////////////////////////////////////////////////////////////// + +if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers + exit; +} + +class getid3_avr extends getid3_handler +{ + /** + * @return bool + */ + public function Analyze() { + $info = &$this->getid3->info; + + // http://cui.unige.ch/OSG/info/AudioFormats/ap11.html + // http://www.btinternet.com/~AnthonyJ/Atari/programming/avr_format.html + // offset type length name comments + // --------------------------------------------------------------------- + // 0 char 4 ID format ID == "2BIT" + // 4 char 8 name sample name (unused space filled with 0) + // 12 short 1 mono/stereo 0=mono, -1 (0xFFFF)=stereo + // With stereo, samples are alternated, + // the first voice is the left : + // (LRLRLRLRLRLRLRLRLR...) + // 14 short 1 resolution 8, 12 or 16 (bits) + // 16 short 1 signed or not 0=unsigned, -1 (0xFFFF)=signed + // 18 short 1 loop or not 0=no loop, -1 (0xFFFF)=loop on + // 20 short 1 MIDI note 0xFFnn, where 0 <= nn <= 127 + // 0xFFFF means "no MIDI note defined" + // 22 byte 1 Replay speed Frequence in the Replay software + // 0=5.485 Khz, 1=8.084 Khz, 2=10.971 Khz, + // 3=16.168 Khz, 4=21.942 Khz, 5=32.336 Khz + // 6=43.885 Khz, 7=47.261 Khz + // -1 (0xFF)=no defined Frequence + // 23 byte 3 sample rate in Hertz + // 26 long 1 size in bytes (2 * bytes in stereo) + // 30 long 1 loop begin 0 for no loop + // 34 long 1 loop size equal to 'size' for no loop + // 38 short 2 Reserved, MIDI keyboard split */ + // 40 short 2 Reserved, sample compression */ + // 42 short 2 Reserved */ + // 44 char 20; Additional filename space, used if (name[7] != 0) + // 64 byte 64 user data + // 128 bytes ? sample data (12 bits samples are coded on 16 bits: + // 0000 xxxx xxxx xxxx) + // --------------------------------------------------------------------- + + // Note that all values are in motorola (big-endian) format, and that long is + // assumed to be 4 bytes, and short 2 bytes. + // When reading the samples, you should handle both signed and unsigned data, + // and be prepared to convert 16->8 bit, or mono->stereo if needed. To convert + // 8-bit data between signed/unsigned just add 127 to the sample values. + // Simularly for 16-bit data you should add 32769 + + $info['fileformat'] = 'avr'; + + $this->fseek($info['avdataoffset']); + $AVRheader = $this->fread(128); + + $info['avr']['raw']['magic'] = substr($AVRheader, 0, 4); + $magic = '2BIT'; + if ($info['avr']['raw']['magic'] != $magic) { + $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['avr']['raw']['magic']).'"'); + unset($info['fileformat']); + unset($info['avr']); + return false; + } + $info['avdataoffset'] += 128; + + $info['avr']['sample_name'] = rtrim(substr($AVRheader, 4, 8)); + $info['avr']['raw']['mono'] = getid3_lib::BigEndian2Int(substr($AVRheader, 12, 2)); + $info['avr']['bits_per_sample'] = getid3_lib::BigEndian2Int(substr($AVRheader, 14, 2)); + $info['avr']['raw']['signed'] = getid3_lib::BigEndian2Int(substr($AVRheader, 16, 2)); + $info['avr']['raw']['loop'] = getid3_lib::BigEndian2Int(substr($AVRheader, 18, 2)); + $info['avr']['raw']['midi'] = getid3_lib::BigEndian2Int(substr($AVRheader, 20, 2)); + $info['avr']['raw']['replay_freq'] = getid3_lib::BigEndian2Int(substr($AVRheader, 22, 1)); + $info['avr']['sample_rate'] = getid3_lib::BigEndian2Int(substr($AVRheader, 23, 3)); + $info['avr']['sample_length'] = getid3_lib::BigEndian2Int(substr($AVRheader, 26, 4)); + $info['avr']['loop_start'] = getid3_lib::BigEndian2Int(substr($AVRheader, 30, 4)); + $info['avr']['loop_end'] = getid3_lib::BigEndian2Int(substr($AVRheader, 34, 4)); + $info['avr']['midi_split'] = getid3_lib::BigEndian2Int(substr($AVRheader, 38, 2)); + $info['avr']['sample_compression'] = getid3_lib::BigEndian2Int(substr($AVRheader, 40, 2)); + $info['avr']['reserved'] = getid3_lib::BigEndian2Int(substr($AVRheader, 42, 2)); + $info['avr']['sample_name_extra'] = rtrim(substr($AVRheader, 44, 20)); + $info['avr']['comment'] = rtrim(substr($AVRheader, 64, 64)); + + $info['avr']['flags']['stereo'] = (($info['avr']['raw']['mono'] == 0) ? false : true); + $info['avr']['flags']['signed'] = (($info['avr']['raw']['signed'] == 0) ? false : true); + $info['avr']['flags']['loop'] = (($info['avr']['raw']['loop'] == 0) ? false : true); + + $info['avr']['midi_notes'] = array(); + if (($info['avr']['raw']['midi'] & 0xFF00) != 0xFF00) { + $info['avr']['midi_notes'][] = ($info['avr']['raw']['midi'] & 0xFF00) >> 8; + } + if (($info['avr']['raw']['midi'] & 0x00FF) != 0x00FF) { + $info['avr']['midi_notes'][] = ($info['avr']['raw']['midi'] & 0x00FF); + } + + if (($info['avdataend'] - $info['avdataoffset']) != ($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 1 : 2))) { + $this->warning('Probable truncated file: expecting '.($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 1 : 2)).' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset'])); + } + + $info['audio']['dataformat'] = 'avr'; + $info['audio']['lossless'] = true; + $info['audio']['bitrate_mode'] = 'cbr'; + $info['audio']['bits_per_sample'] = $info['avr']['bits_per_sample']; + $info['audio']['sample_rate'] = $info['avr']['sample_rate']; + $info['audio']['channels'] = ($info['avr']['flags']['stereo'] ? 2 : 1); + $info['playtime_seconds'] = ($info['avr']['sample_length'] / $info['audio']['channels']) / $info['avr']['sample_rate']; + $info['audio']['bitrate'] = ($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 8 : 16)) / $info['playtime_seconds']; + + + return true; + } + +} |