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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: ELST.php 92 2008-05-10 13:43:14Z svollbehr $
*/
/**#@+ @ignore */
require_once("ISO14496/Box/Full.php");
/**#@-*/
/**
* The <i>Edit List Box</i> contains an explicit timeline map. Each entry
* defines part of the track time-line: by mapping part of the media time-line,
* or by indicating empty time, or by defining a dwell, where a single
* time-point in the media is held for a period.
*
* @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_ELST extends ISO14496_Box_Full
{
/** @var Array */
private $_entries = array();
/**
* 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);
$entryCount = $this->_reader->readUInt32BE();
for ($i = 1; $i <= $entryCount; $i++) {
$entry = array();
if ($this->getVersion() == 1) {
$entry["segmentDuration"] = $this->_reader->readInt64BE();
$entry["mediaTime"] = $this->_reader->readInt64BE();
} else {
$entry["segmentDuration"] = $this->_reader->readUInt32BE();
$entry["mediaTime"] = $this->_reader->readInt32BE();
}
$entry["mediaRate"] = $this->_reader->readInt16BE() +
$this->_reader->readInt16BE() / 10;
$this->_entries[] = $entry;
}
}
/**
* Returns an array of entries. Each entry is an array containing the
* following keys.
* o segmentDuration: specifies the duration of this edit segment in units
* of the timescale in the {@link ISO14496_Box_MVHD Movie Header Box}.
* o mediaTime: the starting time within the media of this edit segment (in
* media time scale units, in composition time). If this field is set to
* –1, it is an empty edit. The last edit in a track shall never be an
* empty edit. Any difference between the duration in the
* {@link ISO14496_Box_MVHD Movie Header Box}, and the track's duration is
* expressed as an implicit empty edit at the end.
* o mediaRate: the relative rate at which to play the media corresponding
* to this edit segment. If this value is 0, then the edit is specifying
* a dwell: the media at media-time is presented for the segment-duration.
* Otherwise this field shall contain the value 1.
*
* @return Array
*/
public function getEntries()
{
return $this->_entries;
}
}
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