Mercurial > judyates
view e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.avr.php @ 28:118cb614cf18 judyates tip
judy bio.
author | Robert McIntyre <rlm@mit.edu> |
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date | Tue, 29 Dec 2015 16:26:18 -0800 |
parents | 3f6b44aa6b35 |
children |
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1 <?php2 // +----------------------------------------------------------------------+3 // | PHP version 5 |4 // +----------------------------------------------------------------------+5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |6 // +----------------------------------------------------------------------+7 // | This source file is subject to version 2 of the GPL license, |8 // | that is bundled with this package in the file license.txt and is |9 // | available through the world-wide-web at the following url: |10 // | http://www.gnu.org/copyleft/gpl.html |11 // +----------------------------------------------------------------------+12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |13 // +----------------------------------------------------------------------+14 // | Authors: James Heinrich <infoØgetid3*org> |15 // | Allan Hansen <ahØartemis*dk> |16 // +----------------------------------------------------------------------+17 // | module.audio.avr.php |18 // | Module for analyzing AVR audio files |19 // | dependencies: NONE |20 // +----------------------------------------------------------------------+21 //22 // $Id: module.audio.avr.php,v 1.2 2006/11/02 10:48:01 ah Exp $26 class getid3_avr extends getid3_handler27 {29 public function Analyze() {31 $getid3 = $this->getid3;33 // http://cui.unige.ch/OSG/info/AudioFormats/ap11.html34 // http://www.btinternet.com/~AnthonyJ/Atari/programming/avr_format.html35 // offset type length name comments36 // ---------------------------------------------------------------------37 // 0 char 4 ID format ID == "2BIT"38 // 4 char 8 name sample name (unused space filled with 0)39 // 12 short 1 mono/stereo 0=mono, -1 (0xFFFF)=stereo40 // With stereo, samples are alternated,41 // the first voice is the left :42 // (LRLRLRLRLRLRLRLRLR...)43 // 14 short 1 resolution 8, 12 or 16 (bits)44 // 16 short 1 signed or not 0=unsigned, -1 (0xFFFF)=signed45 // 18 short 1 loop or not 0=no loop, -1 (0xFFFF)=loop on46 // 20 short 1 MIDI note 0xFFnn, where 0 <= nn <= 12747 // 0xFFFF means "no MIDI note defined"48 // 22 byte 1 Replay speed Frequence in the Replay software49 // 0=5.485 Khz, 1=8.084 Khz, 2=10.971 Khz,50 // 3=16.168 Khz, 4=21.942 Khz, 5=32.336 Khz51 // 6=43.885 Khz, 7=47.261 Khz52 // -1 (0xFF)=no defined Frequence53 // 23 byte 3 sample rate in Hertz54 // 26 long 1 size in bytes (2 * bytes in stereo)55 // 30 long 1 loop begin 0 for no loop56 // 34 long 1 loop size equal to 'size' for no loop57 // 38 short 2 Reserved, MIDI keyboard split */58 // 40 short 2 Reserved, sample compression */59 // 42 short 2 Reserved */60 // 44 char 20; Additional filename space, used if (name[7] != 0)61 // 64 byte 64 user data62 // 128 bytes ? sample data (12 bits samples are coded on 16 bits:63 // 0000 xxxx xxxx xxxx)64 // ---------------------------------------------------------------------66 // Note that all values are in motorola (big-endian) format, and that long is67 // assumed to be 4 bytes, and short 2 bytes.68 // When reading the samples, you should handle both signed and unsigned data,69 // and be prepared to convert 16->8 bit, or mono->stereo if needed. To convert70 // 8-bit data between signed/unsigned just add 127 to the sample values.71 // Simularly for 16-bit data you should add 3276974 // Magic bytes: '2BIT'76 $getid3->info['avr'] = array ();77 $info_avr = &$getid3->info['avr'];79 $getid3->info['fileformat'] = 'avr';80 $info_avr['raw']['magic'] = '2BIT';82 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);83 $avr_header = fread($getid3->fp, 128);85 $getid3->info['avdataoffset'] += 128;87 $info_avr['sample_name'] = rtrim(substr($avr_header, 4, 8));89 $info_avr['raw']['mono'] = getid3_lib::BigEndian2Int(substr($avr_header, 12, 2));90 $info_avr['bits_per_sample'] = getid3_lib::BigEndian2Int(substr($avr_header, 14, 2));91 $info_avr['raw']['signed'] = getid3_lib::BigEndian2Int(substr($avr_header, 16, 2));92 $info_avr['raw']['loop'] = getid3_lib::BigEndian2Int(substr($avr_header, 18, 2));93 $info_avr['raw']['midi'] = getid3_lib::BigEndian2Int(substr($avr_header, 20, 2));94 $info_avr['raw']['replay_freq'] = getid3_lib::BigEndian2Int(substr($avr_header, 22, 1));95 $info_avr['sample_rate'] = getid3_lib::BigEndian2Int(substr($avr_header, 23, 3));96 $info_avr['sample_length'] = getid3_lib::BigEndian2Int(substr($avr_header, 26, 4));97 $info_avr['loop_start'] = getid3_lib::BigEndian2Int(substr($avr_header, 30, 4));98 $info_avr['loop_end'] = getid3_lib::BigEndian2Int(substr($avr_header, 34, 4));99 $info_avr['midi_split'] = getid3_lib::BigEndian2Int(substr($avr_header, 38, 2));100 $info_avr['sample_compression'] = getid3_lib::BigEndian2Int(substr($avr_header, 40, 2));101 $info_avr['reserved'] = getid3_lib::BigEndian2Int(substr($avr_header, 42, 2));102 $info_avr['sample_name_extra'] = rtrim(substr($avr_header, 44, 20));103 $info_avr['comment'] = rtrim(substr($avr_header, 64, 64));105 $info_avr['flags']['stereo'] = (($info_avr['raw']['mono'] == 0) ? false : true);106 $info_avr['flags']['signed'] = (($info_avr['raw']['signed'] == 0) ? false : true);107 $info_avr['flags']['loop'] = (($info_avr['raw']['loop'] == 0) ? false : true);109 $info_avr['midi_notes'] = array ();110 if (($info_avr['raw']['midi'] & 0xFF00) != 0xFF00) {111 $info_avr['midi_notes'][] = ($info_avr['raw']['midi'] & 0xFF00) >> 8;112 }113 if (($info_avr['raw']['midi'] & 0x00FF) != 0x00FF) {114 $info_avr['midi_notes'][] = ($info_avr['raw']['midi'] & 0x00FF);115 }117 if (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) != ($info_avr['sample_length'] * (($info_avr['bits_per_sample'] == 8) ? 1 : 2))) {118 $getid3->warning('Probable truncated file: expecting '.($info_avr['sample_length'] * (($info_avr['bits_per_sample'] == 8) ? 1 : 2)).' bytes of audio data, found '.($getid3->info['avdataend'] - $getid3->info['avdataoffset']));119 }121 $getid3->info['audio']['dataformat'] = 'avr';122 $getid3->info['audio']['lossless'] = true;123 $getid3->info['audio']['bitrate_mode'] = 'cbr';124 $getid3->info['audio']['bits_per_sample'] = $info_avr['bits_per_sample'];125 $getid3->info['audio']['sample_rate'] = $info_avr['sample_rate'];126 $getid3->info['audio']['channels'] = ($info_avr['flags']['stereo'] ? 2 : 1);127 $getid3->info['playtime_seconds'] = ($info_avr['sample_length'] / $getid3->info['audio']['channels']) / $info_avr['sample_rate'];128 $getid3->info['audio']['bitrate'] = ($info_avr['sample_length'] * (($info_avr['bits_per_sample'] == 8) ? 8 : 16)) / $getid3->info['playtime_seconds'];130 return true;131 }132 }135 ?>