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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: STZ2.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. This variant permits smaller
* than 32-bit size fields, to save space when the sizes are varying but small.
* One of the boxes must be present; the {@link ISO14496_Box_STSZ another
* variant} 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_STZ2 extends ISO14496_Box_Full
{
/** @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->_reader->skip(3);
$fieldSize = $this->_reader->readInt8();
$sampleCount = $this->_reader->readUInt32BE();
$data = $this->_reader->read
($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
for ($i = 1; $i <= $sampleCount; $i++) {
switch ($fieldSize) {
case 4:
$this->_sampleSizeTable[$i] =
(($tmp = Transform::fromInt8($data[$i - 1])) >> 4) & 0xf;
if ($i + 1 < $sampleCount)
$this->_sampleSizeTable[$i++] = $tmp & 0xf;
break;
case 8:
$this->_sampleSizeTable[$i] = Transform::fromInt8($data[$i - 1]);
break;
case 16:
$this->_sampleSizeTable[$i] =
Transform::fromUInt16BE(substr($data, ($i - 1) * 2, 2));
break;
}
}
}
/**
* 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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