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- <?php
- class getid3_avr
- {
- function getid3_avr(&$fd, &$ThisFileInfo) {
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- $ThisFileInfo['fileformat'] = 'avr';
- fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
- $AVRheader = fread($fd, 128);
- $ThisFileInfo['avr']['raw']['magic'] = substr($AVRheader, 0, 4);
- if ($ThisFileInfo['avr']['raw']['magic'] != '2BIT') {
- $ThisFileInfo['error'][] = 'Expecting "2BIT" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['avr']['raw']['magic'].'"';
- unset($ThisFileInfo['fileformat']);
- unset($ThisFileInfo['avr']);
- return false;
- }
- $ThisFileInfo['avdataoffset'] += 128;
- $ThisFileInfo['avr']['sample_name'] = rtrim(substr($AVRheader, 4, 8));
- $ThisFileInfo['avr']['raw']['mono'] = getid3_lib::BigEndian2Int(substr($AVRheader, 12, 2));
- $ThisFileInfo['avr']['bits_per_sample'] = getid3_lib::BigEndian2Int(substr($AVRheader, 14, 2));
- $ThisFileInfo['avr']['raw']['signed'] = getid3_lib::BigEndian2Int(substr($AVRheader, 16, 2));
- $ThisFileInfo['avr']['raw']['loop'] = getid3_lib::BigEndian2Int(substr($AVRheader, 18, 2));
- $ThisFileInfo['avr']['raw']['midi'] = getid3_lib::BigEndian2Int(substr($AVRheader, 20, 2));
- $ThisFileInfo['avr']['raw']['replay_freq'] = getid3_lib::BigEndian2Int(substr($AVRheader, 22, 1));
- $ThisFileInfo['avr']['sample_rate'] = getid3_lib::BigEndian2Int(substr($AVRheader, 23, 3));
- $ThisFileInfo['avr']['sample_length'] = getid3_lib::BigEndian2Int(substr($AVRheader, 26, 4));
- $ThisFileInfo['avr']['loop_start'] = getid3_lib::BigEndian2Int(substr($AVRheader, 30, 4));
- $ThisFileInfo['avr']['loop_end'] = getid3_lib::BigEndian2Int(substr($AVRheader, 34, 4));
- $ThisFileInfo['avr']['midi_split'] = getid3_lib::BigEndian2Int(substr($AVRheader, 38, 2));
- $ThisFileInfo['avr']['sample_compression'] = getid3_lib::BigEndian2Int(substr($AVRheader, 40, 2));
- $ThisFileInfo['avr']['reserved'] = getid3_lib::BigEndian2Int(substr($AVRheader, 42, 2));
- $ThisFileInfo['avr']['sample_name_extra'] = rtrim(substr($AVRheader, 44, 20));
- $ThisFileInfo['avr']['comment'] = rtrim(substr($AVRheader, 64, 64));
- $ThisFileInfo['avr']['flags']['stereo'] = (($ThisFileInfo['avr']['raw']['mono'] == 0) ? false : true);
- $ThisFileInfo['avr']['flags']['signed'] = (($ThisFileInfo['avr']['raw']['signed'] == 0) ? false : true);
- $ThisFileInfo['avr']['flags']['loop'] = (($ThisFileInfo['avr']['raw']['loop'] == 0) ? false : true);
- $ThisFileInfo['avr']['midi_notes'] = array();
- if (($ThisFileInfo['avr']['raw']['midi'] & 0xFF00) != 0xFF00) {
- $ThisFileInfo['avr']['midi_notes'][] = ($ThisFileInfo['avr']['raw']['midi'] & 0xFF00) >> 8;
- }
- if (($ThisFileInfo['avr']['raw']['midi'] & 0x00FF) != 0x00FF) {
- $ThisFileInfo['avr']['midi_notes'][] = ($ThisFileInfo['avr']['raw']['midi'] & 0x00FF);
- }
- if (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) != ($ThisFileInfo['avr']['sample_length'] * (($ThisFileInfo['avr']['bits_per_sample'] == 8) ? 1 : 2))) {
- $ThisFileInfo['warning'][] = 'Probable truncated file: expecting '.($ThisFileInfo['avr']['sample_length'] * (($ThisFileInfo['avr']['bits_per_sample'] == 8) ? 1 : 2)).' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']);
- }
- $ThisFileInfo['audio']['dataformat'] = 'avr';
- $ThisFileInfo['audio']['lossless'] = true;
- $ThisFileInfo['audio']['bitrate_mode'] = 'cbr';
- $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['avr']['bits_per_sample'];
- $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['avr']['sample_rate'];
- $ThisFileInfo['audio']['channels'] = ($ThisFileInfo['avr']['flags']['stereo'] ? 2 : 1);
- $ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avr']['sample_length'] / $ThisFileInfo['audio']['channels']) / $ThisFileInfo['avr']['sample_rate'];
- $ThisFileInfo['audio']['bitrate'] = ($ThisFileInfo['avr']['sample_length'] * (($ThisFileInfo['avr']['bits_per_sample'] == 8) ? 8 : 16)) / $ThisFileInfo['playtime_seconds'];
- return true;
- }
- }
- ?>
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