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File: includes/getid3/module.audio.avr.php

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio.avr.php  >  Download  
File: includes/getid3/module.audio.avr.php
Role: Auxiliary script
Content type: text/plain
Description: getID3 dependency
Class: WaldScan
Scan directories for files with certain extensions
Author: By
Last change:
Date: 2 years ago
Size: 6,964 bytes
 

Contents

Class file image Download
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.avr.php //
// module for analyzing AVR Audio files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////


class getid3_avr extends getid3_handler
{

    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';

       
fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
       
$AVRheader = fread($this->getid3->fp, 128);

       
$info['avr']['raw']['magic'] = substr($AVRheader, 0, 4);
       
$magic = '2BIT';
        if (
$info['avr']['raw']['magic'] != $magic) {
           
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($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))) {
           
$info['warning'][] = 'Probable truncated file: expecting '.($info['avr']['sample_length'] * (($info['avr']['bits_per_sample'] == 8) ? 1 : 2)).' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']);
        }

       
$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;
    }

}


?>