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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: STTS.php 92 2008-05-10 13:43:14Z svollbehr $
*/
/**#@+ @ignore */
require_once("ISO14496/Box/Full.php");
/**#@-*/
/**
* The <i>Decoding Time to Sample Box</i> contains a compact version of a table
* that allows indexing from decoding time to sample number. Other tables give
* sample sizes and pointers, from the sample number. Each entry in the table
* gives the number of consecutive samples with the same time delta, and the
* delta of those samples. By adding the deltas a complete time-to-sample map
* may be built.
*
* The Decoding Time to Sample Box contains decode time delta's: DT(n+1) = DT(n)
* + STTS(n) where STTS(n) is the (uncompressed) table entry for sample n.
*
* The sample entries are ordered by decoding time stamps; therefore the deltas
* are all non-negative.
*
* The DT axis has a zero origin; DT(i) = SUM(for j=0 to i-1 of delta(j)), and
* the sum of all deltas gives the length of the media in the track (not mapped
* to the overall timescale, and not considering any edit list).
*
* The {@link ISO14496_Box_ELST Edit List Box} provides the initial CT value if
* it is non-empty (non-zero).
*
* @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_STTS extends ISO14496_Box_Full
{
/** @var Array */
private $_timeToSampleTable = 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();
$data = $this->_reader->read
($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
for ($i = 1; $i <= $entryCount; $i++)
$this->_timeToSampleTable[$i] = array
("sampleCount" =>
Transform::fromUInt32BE(substr($data, ($i - 1) * 8, 4)),
"sampleDelta" =>
Transform::fromUInt32BE(substr($data, $i * 8 - 4, 4)));
}
/**
* Returns an array of values. Each entry is an array containing the following
* keys.
* o sampleCount -- an integer that counts the number of consecutive samples
* that have the given duration.
* o sampleDelta -- an integer that gives the delta of these samples in the
* time-scale of the media.
*
* @return Array
*/
public function getTimeToSampleTable()
{
return $this->_timeToSampleTable;
}
}
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