ecommun / owncloud_ynh

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sources/3rdparty/getid3/module.audio.au.php 5.29 KB
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  <?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.au.php                                         //
  // module for analyzing AU files                               //
  // dependencies: NONE                                          //
  //                                                            ///
  /////////////////////////////////////////////////////////////////
  
  
  class getid3_au extends getid3_handler
  {
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  	public function Analyze() {
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  		$info = &$this->getid3->info;
  
  		fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
  		$AUheader  = fread($this->getid3->fp, 8);
  
  		$magic = '.snd';
  		if (substr($AUheader, 0, 4) != $magic) {
  			$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" (".snd") at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($AUheader, 0, 4)).'"';
  			return false;
  		}
  
  		// shortcut
  		$info['au'] = array();
  		$thisfile_au        = &$info['au'];
  
  		$info['fileformat']            = 'au';
  		$info['audio']['dataformat']   = 'au';
  		$info['audio']['bitrate_mode'] = 'cbr';
  		$thisfile_au['encoding']               = 'ISO-8859-1';
  
  		$thisfile_au['header_length']   = getid3_lib::BigEndian2Int(substr($AUheader,  4, 4));
  		$AUheader .= fread($this->getid3->fp, $thisfile_au['header_length'] - 8);
  		$info['avdataoffset'] += $thisfile_au['header_length'];
  
  		$thisfile_au['data_size']             = getid3_lib::BigEndian2Int(substr($AUheader,  8, 4));
  		$thisfile_au['data_format_id']        = getid3_lib::BigEndian2Int(substr($AUheader, 12, 4));
  		$thisfile_au['sample_rate']           = getid3_lib::BigEndian2Int(substr($AUheader, 16, 4));
  		$thisfile_au['channels']              = getid3_lib::BigEndian2Int(substr($AUheader, 20, 4));
  		$thisfile_au['comments']['comment'][] =                      trim(substr($AUheader, 24));
  
  		$thisfile_au['data_format'] = $this->AUdataFormatNameLookup($thisfile_au['data_format_id']);
  		$thisfile_au['used_bits_per_sample'] = $this->AUdataFormatUsedBitsPerSampleLookup($thisfile_au['data_format_id']);
  		if ($thisfile_au['bits_per_sample'] = $this->AUdataFormatBitsPerSampleLookup($thisfile_au['data_format_id'])) {
  			$info['audio']['bits_per_sample'] = $thisfile_au['bits_per_sample'];
  		} else {
  			unset($thisfile_au['bits_per_sample']);
  		}
  
  		$info['audio']['sample_rate']  = $thisfile_au['sample_rate'];
  		$info['audio']['channels']     = $thisfile_au['channels'];
  
  		if (($info['avdataoffset'] + $thisfile_au['data_size']) > $info['avdataend']) {
  			$info['warning'][] = 'Possible truncated file - expecting "'.$thisfile_au['data_size'].'" bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' bytes"';
  		}
  
  		$info['playtime_seconds'] = $thisfile_au['data_size'] / ($thisfile_au['sample_rate'] * $thisfile_au['channels'] * ($thisfile_au['used_bits_per_sample'] / 8));
  		$info['audio']['bitrate'] = ($thisfile_au['data_size'] * 8) / $info['playtime_seconds'];
  
  		return true;
  	}
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  	public function AUdataFormatNameLookup($id) {
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  		static $AUdataFormatNameLookup = array(
  			0  => 'unspecified format',
  			1  => '8-bit mu-law',
  			2  => '8-bit linear',
  			3  => '16-bit linear',
  			4  => '24-bit linear',
  			5  => '32-bit linear',
  			6  => 'floating-point',
  			7  => 'double-precision float',
  			8  => 'fragmented sampled data',
  			9  => 'SUN_FORMAT_NESTED',
  			10 => 'DSP program',
  			11 => '8-bit fixed-point',
  			12 => '16-bit fixed-point',
  			13 => '24-bit fixed-point',
  			14 => '32-bit fixed-point',
  
  			16 => 'non-audio display data',
  			17 => 'SND_FORMAT_MULAW_SQUELCH',
  			18 => '16-bit linear with emphasis',
  			19 => '16-bit linear with compression',
  			20 => '16-bit linear with emphasis + compression',
  			21 => 'Music Kit DSP commands',
  			22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES',
  			23 => 'CCITT g.721 4-bit ADPCM',
  			24 => 'CCITT g.722 ADPCM',
  			25 => 'CCITT g.723 3-bit ADPCM',
  			26 => 'CCITT g.723 5-bit ADPCM',
  			27 => 'A-Law 8-bit'
  		);
  		return (isset($AUdataFormatNameLookup[$id]) ? $AUdataFormatNameLookup[$id] : false);
  	}
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  	public function AUdataFormatBitsPerSampleLookup($id) {
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  		static $AUdataFormatBitsPerSampleLookup = array(
  			1  => 8,
  			2  => 8,
  			3  => 16,
  			4  => 24,
  			5  => 32,
  			6  => 32,
  			7  => 64,
  
  			11 => 8,
  			12 => 16,
  			13 => 24,
  			14 => 32,
  
  			18 => 16,
  			19 => 16,
  			20 => 16,
  
  			23 => 16,
  
  			25 => 16,
  			26 => 16,
  			27 => 8
  		);
  		return (isset($AUdataFormatBitsPerSampleLookup[$id]) ? $AUdataFormatBitsPerSampleLookup[$id] : false);
  	}
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  	public function AUdataFormatUsedBitsPerSampleLookup($id) {
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  		static $AUdataFormatUsedBitsPerSampleLookup = array(
  			1  => 8,
  			2  => 8,
  			3  => 16,
  			4  => 24,
  			5  => 32,
  			6  => 32,
  			7  => 64,
  
  			11 => 8,
  			12 => 16,
  			13 => 24,
  			14 => 32,
  
  			18 => 16,
  			19 => 16,
  			20 => 16,
  
  			23 => 4,
  
  			25 => 3,
  			26 => 5,
  			27 => 8,
  		);
  		return (isset($AUdataFormatUsedBitsPerSampleLookup[$id]) ? $AUdataFormatUsedBitsPerSampleLookup[$id] : false);
  	}
  
  }