163 lines
No EOL
5.3 KiB
PHP
163 lines
No EOL
5.3 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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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.au.php //
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// module for analyzing AU files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_au
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{
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function getid3_au(&$fd, &$ThisFileInfo) {
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fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
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$AUheader = fread($fd, 8);
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if (substr($AUheader, 0, 4) != '.snd') {
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$ThisFileInfo['error'][] = 'Expecting ".snd" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($AUheader, 0, 4).'"';
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return false;
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}
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// shortcut
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$ThisFileInfo['au'] = array();
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$thisfile_au = &$ThisFileInfo['au'];
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$ThisFileInfo['fileformat'] = 'au';
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$ThisFileInfo['audio']['dataformat'] = 'au';
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$ThisFileInfo['audio']['bitrate_mode'] = 'cbr';
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$thisfile_au['encoding'] = 'ISO-8859-1';
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$thisfile_au['header_length'] = getid3_lib::BigEndian2Int(substr($AUheader, 4, 4));
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$AUheader .= fread($fd, $thisfile_au['header_length'] - 8);
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$ThisFileInfo['avdataoffset'] += $thisfile_au['header_length'];
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$thisfile_au['data_size'] = getid3_lib::BigEndian2Int(substr($AUheader, 8, 4));
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$thisfile_au['data_format_id'] = getid3_lib::BigEndian2Int(substr($AUheader, 12, 4));
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$thisfile_au['sample_rate'] = getid3_lib::BigEndian2Int(substr($AUheader, 16, 4));
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$thisfile_au['channels'] = getid3_lib::BigEndian2Int(substr($AUheader, 20, 4));
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$thisfile_au['comments']['comment'][] = trim(substr($AUheader, 24));
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$thisfile_au['data_format'] = $this->AUdataFormatNameLookup($thisfile_au['data_format_id']);
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$thisfile_au['used_bits_per_sample'] = $this->AUdataFormatUsedBitsPerSampleLookup($thisfile_au['data_format_id']);
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if ($thisfile_au['bits_per_sample'] = $this->AUdataFormatBitsPerSampleLookup($thisfile_au['data_format_id'])) {
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$ThisFileInfo['audio']['bits_per_sample'] = $thisfile_au['bits_per_sample'];
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} else {
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unset($thisfile_au['bits_per_sample']);
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}
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$ThisFileInfo['audio']['sample_rate'] = $thisfile_au['sample_rate'];
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$ThisFileInfo['audio']['channels'] = $thisfile_au['channels'];
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if (($ThisFileInfo['avdataoffset'] + $thisfile_au['data_size']) > $ThisFileInfo['avdataend']) {
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$ThisFileInfo['warning'][] = 'Possible truncated file - expecting "'.$thisfile_au['data_size'].'" bytes of audio data, only found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' bytes"';
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}
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$ThisFileInfo['playtime_seconds'] = $thisfile_au['data_size'] / ($thisfile_au['sample_rate'] * $thisfile_au['channels'] * ($thisfile_au['used_bits_per_sample'] / 8));
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$ThisFileInfo['audio']['bitrate'] = ($thisfile_au['data_size'] * 8) / $ThisFileInfo['playtime_seconds'];
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return true;
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}
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function AUdataFormatNameLookup($id) {
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static $AUdataFormatNameLookup = array(
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0 => 'unspecified format',
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1 => '8-bit mu-law',
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2 => '8-bit linear',
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3 => '16-bit linear',
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4 => '24-bit linear',
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5 => '32-bit linear',
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6 => 'floating-point',
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7 => 'double-precision float',
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8 => 'fragmented sampled data',
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9 => 'SUN_FORMAT_NESTED',
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10 => 'DSP program',
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11 => '8-bit fixed-point',
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12 => '16-bit fixed-point',
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13 => '24-bit fixed-point',
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14 => '32-bit fixed-point',
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16 => 'non-audio display data',
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17 => 'SND_FORMAT_MULAW_SQUELCH',
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18 => '16-bit linear with emphasis',
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19 => '16-bit linear with compression',
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20 => '16-bit linear with emphasis + compression',
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21 => 'Music Kit DSP commands',
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22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES',
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23 => 'CCITT g.721 4-bit ADPCM',
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24 => 'CCITT g.722 ADPCM',
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25 => 'CCITT g.723 3-bit ADPCM',
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26 => 'CCITT g.723 5-bit ADPCM',
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27 => 'A-Law 8-bit'
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);
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return (isset($AUdataFormatNameLookup[$id]) ? $AUdataFormatNameLookup[$id] : false);
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}
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function AUdataFormatBitsPerSampleLookup($id) {
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static $AUdataFormatBitsPerSampleLookup = array(
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1 => 8,
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2 => 8,
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3 => 16,
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4 => 24,
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5 => 32,
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6 => 32,
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7 => 64,
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11 => 8,
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12 => 16,
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13 => 24,
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14 => 32,
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18 => 16,
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19 => 16,
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20 => 16,
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23 => 16,
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25 => 16,
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26 => 16,
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27 => 8
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);
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return (isset($AUdataFormatBitsPerSampleLookup[$id]) ? $AUdataFormatBitsPerSampleLookup[$id] : false);
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}
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function AUdataFormatUsedBitsPerSampleLookup($id) {
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static $AUdataFormatUsedBitsPerSampleLookup = array(
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1 => 8,
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2 => 8,
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3 => 16,
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4 => 24,
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5 => 32,
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6 => 32,
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7 => 64,
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11 => 8,
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12 => 16,
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13 => 24,
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14 => 32,
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18 => 16,
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19 => 16,
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20 => 16,
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23 => 4,
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25 => 3,
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26 => 5,
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27 => 8,
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);
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return (isset($AUdataFormatUsedBitsPerSampleLookup[$id]) ? $AUdataFormatUsedBitsPerSampleLookup[$id] : false);
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}
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}
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?>
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