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Add support for MPEG-1/2 Audio (ISO/IEC 11172-3 and ISO/IEC 13818-3 respectively)

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git-svn-id: http://php-reader.googlecode.com/svn/trunk@114 51a70ab9-7547-0410-9469-37e369ee0574
This commit is contained in:
svollbehr
2008-12-03 21:49:43 +00:00
parent 07a5e6bd3c
commit edc63529da
10 changed files with 2090 additions and 8 deletions
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165
src/MPEG/Audio/VBRIHeader.php Normal file
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<?php
/**
* PHP Reader Library
*
* Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the project workgroup nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @package php-reader
* @subpackage MPEG
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: VBRIHeader.php 1 2008-07-19 10:43:41Z rbutterfield $
*/
/**#@+ @ignore */
require_once("Reader.php");
require_once("Twiddling.php");
require_once("MPEG/Object.php");
/**#@-*/
/**
* This class represents the Fraunhofer IIS VBR header which is often found in
* the first frame of an MPEG stream.
*
* @package php-reader
* @subpackage MPEG
* @author Ryan Butterfield <buttza@gmail.com>
* @author Sven Vollbehr <svollbehr@gmail.com>
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Rev: 1 $
*/
class MPEG_Audio_VBRIHeader extends MPEG_Object
{
/** @var integer */
private $_version;
/** @var integer */
private $_delay;
/** @var integer */
private $_qualityIndicator;
/** @var integer */
private $_bytes;
/** @var integer */
private $_frames;
/** @var Array */
private $_toc = array();
/** @var integer */
private $_tocFramesPerEntry;
/** @var integer */
private $_length;
/**
* Constructs the class with given parameters and reads object related data
* from the bitstream.
*
* @param Reader $reader The reader object.
* @param Array $options Array of options.
*/
public function __construct($reader, &$options = array())
{
$offset = $this->_reader->getOffset();
$this->_version = $this->_reader->readUInt16BE();
$this->_delay = $this->_reader->readUInt16BE();
$this->_qualityIndicator = $this->_reader->readUInt16BE();
$this->_bytes = $this->_reader->readUInt32BE();
$this->_frames = $this->_reader->readUInt32BE();
$tocEntries = $this->_reader->readUInt16BE();
$tocEntryScale = $this->_reader->readUInt16BE();
$tocEntrySize = $this->_reader->readUInt16BE();
$this->_tocFramesPerEntry = $this->_reader->readUInt16BE();
$this->_toc = array_merge(unpack(($tocEntrySize == 1) ? "C*" :
($tocEntrySize == 2) ? "n*" : "N*",
$this->_reader->read($tocCount * $tocEntrySize)));
foreach ($this->_toc as $key => $value)
$this->_toc[$key] = $tocEntryScale * $value;
$this->_length = $this->_reader->getOffset() - $offset;
}
/**
* Returns the header version.
*
* @return integer
*/
public function getVersion() { return $this->_version; }
/**
* Returns the delay.
*
* @return integer
*/
public function getDelay() { return $this->_delay; }
/**
* Returns the quality indicator. Return value varies from 0 (best quality) to
* 100 (worst quality).
*
* @return integer
*/
public function getQualityIndicator() { return $this->_qualityIndicator; }
/**
* Returns the number of bytes in the file.
*
* @return integer
*/
public function getBytes() { return $this->_bytes; }
/**
* Returns the number of frames in the file.
*
* @return integer
*/
public function getFrames() { return $this->_frames; }
/**
* Returns the table of contents array.
*
* @return Array
*/
public function getToc() { return $this->_toc; }
/**
* Returns the number of frames per TOC entry.
*
* @return integer
*/
public function getTocFramesPerEntry() { return $this->_tocFramesPerEntry; }
/**
* Returns the length of the header in bytes.
*
* @return integer
*/
public function getLength() { return $this->_length; }
}