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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: POSS.php 105 2008-07-30 14:56:47Z svollbehr $
*/
/**#@+ @ignore */
require_once("ID3/Frame.php");
require_once("ID3/Timing.php");
/**#@-*/
/**
* The <i>Position synchronisation frame</i> delivers information to the
* listener of how far into the audio stream he picked up; in effect, it states
* the time offset from the first frame in the stream. There may only be one
* POSS frame in each tag.
*
* @package php-reader
* @subpackage ID3
* @author Sven Vollbehr <svollbehr@gmail.com>
* @author Ryan Butterfield <buttza@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: 105 $
*/
final class ID3_Frame_POSS extends ID3_Frame
implements ID3_Timing
{
/** @var integer */
private $_format = ID3_Timing::MPEG_FRAMES;
/** @var integer */
private $_position;
/**
* 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)
return;
$this->_format = Transform::fromUInt8($this->_data[0]);
$this->_position = Transform::fromUInt32BE(substr($this->_data, 1, 4));
}
/**
* Returns the timing format.
*
* @return integer
*/
public function getFormat() { return $this->_format; }
/**
* Sets the timing format.
*
* @see ID3_Timing
* @param integer $format The timing format.
*/
public function setFormat($format) { $this->_format = $format; }
/**
* Returns the position where in the audio the listener starts to receive,
* i.e. the beginning of the next frame.
*
* @return integer
*/
public function getPosition() { return $this->_position; }
/**
* Sets the position where in the audio the listener starts to receive,
* i.e. the beginning of the next frame, using given format.
*
* @param integer $position The position.
* @param integer $format The timing format.
*/
public function setPosition($position, $format = false)
{
$this->_position = $position;
if ($format !== false)
$this->_format = $format;
}
/**
* Returns the frame raw data.
*
* @return string
*/
public function __toString()
{
$this->setData
(Transform::toUInt8($this->_format) .
Transform::toUInt32BE($this->_position));
return parent::__toString();
}
}
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