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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 ID3
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: MLLT.php 75 2008-04-14 23:57:21Z svollbehr $
*/
/**#@+ @ignore */
require_once("ID3/Frame.php");
/**#@-*/
/**
* To increase performance and accuracy of jumps within a MPEG audio file,
* frames with time codes in different locations in the file might be useful.
* The <i>MPEG location lookup table</i> frame includes references that the
* software can use to calculate positions in the file.
*
* The MPEG frames between reference describes how much the frame counter should
* be increased for every reference. If this value is two then the first
* reference points out the second frame, the 2nd reference the 4th frame, the
* 3rd reference the 6th frame etc. In a similar way the bytes between reference
* and milliseconds between reference points out bytes and milliseconds
* respectively.
*
* Each reference consists of two parts; a certain number of bits that describes
* the difference between what is said in bytes between reference and the
* reality and a certain number of bits that describes the difference between
* what is said in milliseconds between reference and the reality.
*
* There may only be one MLLT frame in each tag.
*
* @todo Data parsing and write support
* @package php-reader
* @subpackage ID3
* @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: 75 $
*/
final class ID3_Frame_MLLT extends ID3_Frame
{
/** @var integer */
private $_frames;
/** @var integer */
private $_bytes;
/** @var integer */
private $_milliseconds;
/** @var Array */
private $_deviation = array();
/**
* Constructs the class with given parameters and parses object related data.
*
* @param Reader $reader The reader object.
* @param Array $options The options array.
*/
public function __construct($reader = null, &$options = array())
{
parent::__construct($reader, $options);
if ($reader === null)
throw new ID3_Exception("Write not supported yet");
$this->_frames = Transform::fromInt16BE(substr($this->_data, 0, 2));
$this->_bytes = Transform::fromInt32BE(substr($this->_data, 2, 3));
$this->_milliseconds = Transform::fromInt32BE(substr($this->_data, 5, 3));
$byteDevBits = Transform::fromInt8($this->_data[8]);
$millisDevBits = Transform::fromInt8($this->_data[9]);
// $data = substr($this->_data, 10);
}
/**
* Returns the number of MPEG frames between reference.
*
* @return integer
*/
public function getFrames() { return $this->_frames; }
/**
* Sets the number of MPEG frames between reference.
*
* @param integer $frames The number of MPEG frames.
*/
public function setFrames($frames) { $this->_frames = $frames; }
/**
* Returns the number of bytes between reference.
*
* @return integer
*/
public function getBytes() { return $this->_bytes; }
/**
* Sets the number of bytes between reference.
*
* @param integer $bytes The number of bytes.
*/
public function setBytes($bytes) { $this->_bytes = $bytes; }
/**
* Returns the number of milliseconds between references.
*
* @return integer
*/
public function getMilliseconds() { return $this->_milliseconds; }
/**
* Sets the number of milliseconds between references.
*
* @param integer $milliseconds The number of milliseconds.
*/
public function setMilliseconds($milliseconds)
{
return $this->_milliseconds;
}
/**
* Returns the deviations as an array. Each value is an array containing two
* values, ie the deviation in bytes, and the deviation in milliseconds,
* respectively.
*
* @return Array
*/
public function getDeviation() { return $this->_deviation; }
/**
* Sets the deviations array. The array must consist of arrays, each of which
* having two values, the deviation in bytes, and the deviation in
* milliseconds, respectively.
*
* @param Array $deviation The deviations array.
*/
public function setDeviation($deviation) { $this->_deviation = $deviation; }
}
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