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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: TKHD.php 92 2008-05-10 13:43:14Z svollbehr $
*/
/**#@+ @ignore */
require_once("ISO14496/Box/Full.php");
/**#@-*/
/**
* The <i>Track Header Box</i> specifies the characteristics of a single track.
* Exactly one Track Header Box is contained in a track.
*
* In the absence of an edit list, the presentation of a track starts at the
* beginning of the overall presentation. An empty edit is used to offset the
* start time of a track.
*
* @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_TKHD extends ISO14496_Box_Full
{
/** @var integer */
private $_creationTime;
/** @var integer */
private $_modificationTime;
/** @var integer */
private $_trackId;
/** @var integer */
private $_duration;
/** @var integer */
private $_width;
/** @var integer */
private $_height;
/**
* Indicates that the track is enabled. A disabled track is treated as if it
* were not present.
*/
const TRACK_ENABLED = 1;
/** Indicates that the track is used in the presentation. */
const TRACK_IN_MOVIE = 2;
/** Indicates that the track is used when previewing the presentation. */
const TRACK_IN_PREVIEW = 4;
/**
* 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->_trackId = $this->_reader->readUInt32BE();
$this->_reader->skip(4);
$this->_duration = $this->_reader->readInt64BE();
} else {
$this->_creationTime = $this->_reader->readUInt32BE();
$this->_modificationTime = $this->_reader->readUInt32BE();
$this->_trackId = $this->_reader->readUInt32BE();
$this->_reader->skip(4);
$this->_duration = $this->_reader->readUInt32BE();
}
$this->_reader->skip(52);
$this->_width =
((($tmp = $this->_reader->readUInt32BE()) >> 16) & 0xffff) +
($tmp & 0xffff) / 10;
$this->_height =
((($tmp = $this->_reader->readUInt32BE()) >> 16) & 0xffff) +
($tmp & 0xffff) / 10;
}
/**
* Returns the creation time of this track in seconds since midnight, Jan. 1,
* 1904, in UTC time.
*
* @return integer
*/
public function getCreationTime() { return $this->_creationTime; }
/**
* Returns the most recent time the track was modified in seconds since
* midnight, Jan. 1, 1904, in UTC time.
*
* @return integer
*/
public function getModificationTime() { return $this->_modificationTime; }
/**
* Returns a number that uniquely identifies this track over the entire
* life-time of this presentation. Track IDs are never re-used and cannot be
* zero.
*
* @return integer
*/
public function getTrackId() { return $this->_trackId; }
/**
* Returns the duration of this track (in the timescale indicated in the
* {@link MVHD Movie Header Box}). The value of this field is equal to the sum
* of the durations of all of the track's edits. If there is no edit list,
* then the duration is the sum of the sample durations, converted into the
* timescale in the {@link MVHD Movie Header Box}. If the duration of this
* track cannot be determined then duration is set to all 32-bit maxint.
*
* @return integer
*/
public function getDuration() { return $this->_duration; }
/**
* Returns the track's visual presentation width. This needs not be the same
* as the pixel width of the images; all images in the sequence are scaled to
* this width, before any overall transformation of the track represented by
* the matrix. The pixel width of the images is the default value.
*
* @return integer
*/
public function getWidth() { return $this->_rate; }
/**
* Returns the track's visual presentation height. This needs not be the same
* as the pixel height of the images; all images in the sequence are scaled to
* this height, before any overall transformation of the track represented by
* the matrix. The pixel height of the images is the default value.
*
* @return integer
*/
public function getHeight() { return $this->_volume; }
}
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