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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 ISO 14496
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: MVHD.php 92 2008-05-10 13:43:14Z svollbehr $
*/
/**#@+ @ignore */
require_once("ISO14496/Box/Full.php");
/**#@-*/
/**
* The <i>Movie Header Box</i> defines overall information which is
* media-independent, and relevant to the entire presentation considered as a
* whole.
*
* @package php-reader
* @subpackage ISO 14496
* @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: 92 $
*/
final class ISO14496_Box_MVHD extends ISO14496_Box_Full
{
/** @var integer */
private $_creationTime;
/** @var integer */
private $_modificationTime;
/** @var integer */
private $_timescale;
/** @var integer */
private $_duration;
/** @var integer */
private $_rate;
/** @var integer */
private $_volume;
/** @var integer */
private $_nextTrackId;
/**
* Constructs the class with given parameters and reads box related data from
* the ISO Base Media file.
*
* @param Reader $reader The reader object.
*/
public function __construct($reader, &$options = array())
{
parent::__construct($reader, $options);
if ($this->getVersion() == 1) {
$this->_creationTime = $this->_reader->readInt64BE();
$this->_modificationTime = $this->_reader->readInt64BE();
$this->_timescale = $this->_reader->readUInt32BE();
$this->_duration = $this->_reader->readInt64BE();
} else {
$this->_creationTime = $this->_reader->readUInt32BE();
$this->_modificationTime = $this->_reader->readUInt32BE();
$this->_timescale = $this->_reader->readUInt32BE();
$this->_duration = $this->_reader->readUInt32BE();
}
$this->_rate =
((($tmp = $this->_reader->readUInt32BE()) >> 16) & 0xffff) +
($tmp & 0xffff) / 10;
$this->_volume = ((($tmp = $this->_reader->readUInt16BE()) >> 8) & 0xff) +
($tmp & 0xff) / 10;
$this->_reader->skip(70);
$this->_nextTrackId = $this->_reader->readUInt32BE();
}
/**
* Returns the creation time of the presentation. The value is in seconds
* since midnight, Jan. 1, 1904, in UTC time.
*
* @return integer
*/
public function getCreationTime() { return $this->_creationTime; }
/**
* Returns the most recent time the presentation was modified. The value is in
* seconds since midnight, Jan. 1, 1904, in UTC time.
*
* @return integer
*/
public function getModificationTime() { return $this->_modificationTime; }
/**
* Returns the time-scale for the entire presentation. This is the number of
* time units that pass in one second. For example, a time coordinate system
* that measures time in sixtieths of a second has a time scale of 60.
*
* @return integer
*/
public function getTimescale() { return $this->_timescale; }
/**
* Returns the length of the presentation in the indicated timescale. This
* property is derived from the presentation's tracks: the value of this field
* corresponds to the duration of the longest track in the presentation.
*
* @return integer
*/
public function getDuration() { return $this->_duration; }
/**
* Returns the preferred rate to play the presentation. 1.0 is normal forward
* playback.
*
* @return integer
*/
public function getRate() { return $this->_rate; }
/**
* Returns the preferred playback volume. 1.0 is full volume.
*
* @return integer
*/
public function getVolume() { return $this->_volume; }
/**
* Returns a value to use for the track ID of the next track to be added to
* this presentation. Zero is not a valid track ID value. The value is larger
* than the largest track-ID in use. If this value is equal to or larger than
* 32-bit maxint, and a new media track is to be added, then a search must be
* made in the file for a unused track identifier.
*
* @return integer
*/
public function getNextTrackId() { return $this->_nextTrackId; }
}
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