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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: STSZ.php 92 2008-05-10 13:43:14Z svollbehr $
*/
/**#@+ @ignore */
require_once("ISO14496/Box/Full.php");
/**#@-*/
/**
* The <i>Sample Size Box</i> contains the sample count and a table giving the
* size in bytes of each sample. This allows the media data itself to be
* unframed. The total number of samples in the media is always indicated in the
* sample count.
*
* There are two variants of the sample size box. The first variant has a fixed
* size 32-bit field for representing the sample sizes; it permits defining a
* constant size for all samples in a track. The second variant permits smaller
* size fields, to save space when the sizes are varying but small. One of these
* boxes must be present; the first version is preferred for maximum
* compatibility.
*
* @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_STSZ extends ISO14496_Box_Full
{
/** @var integer */
private $_sampleSize;
/** @var Array */
private $_sampleSizeTable = 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);
$this->_sampleSize = $this->_reader->readUInt32BE();
$sampleCount = $this->_reader->readUInt32BE();
if ($this->_sampleSize == 0) {
$data = $this->_reader->read
($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
for ($i = 1; $i <= $sampleCount; $i++)
$this->_sampleSizeTable[$i] =
Transform::fromUInt32BE(substr($data, ($i - 1) * 4, 4));
}
}
/**
* Returns the default sample size. If all the samples are the same size, this
* field contains that size value. If this field is set to 0, then the samples
* have different sizes, and those sizes are stored in the sample size table.
*
* @return integer
*/
public function getSampleSize() { return $this->_sampleSize; }
/**
* Returns an array of sample sizes specifying the size of a sample, indexed
* by its number.
*
* @return Array
*/
public function getSampleSizeTable()
{
return $this->_sampleSizeTable;
}
}
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