a97d59bf89
git-svn-id: http://php-reader.googlecode.com/svn/trunk@92 51a70ab9-7547-0410-9469-37e369ee0574
111 lines
4.2 KiB
PHP
111 lines
4.2 KiB
PHP
<?php
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/**
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* PHP Reader Library
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*
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* Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the project workgroup nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package php-reader
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* @subpackage ISO 14496
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* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Id$
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*/
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/**#@+ @ignore */
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require_once("ISO14496/Box/Full.php");
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/**#@-*/
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/**
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* The <i>Sample Size Box</i> contains the sample count and a table giving the
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* size in bytes of each sample. This allows the media data itself to be
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* unframed. The total number of samples in the media is always indicated in the
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* sample count.
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*
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* There are two variants of the sample size box. The first variant has a fixed
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* size 32-bit field for representing the sample sizes; it permits defining a
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* constant size for all samples in a track. The second variant permits smaller
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* size fields, to save space when the sizes are varying but small. One of these
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* boxes must be present; the first version is preferred for maximum
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* compatibility.
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*
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* @package php-reader
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* @subpackage ISO 14496
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* @author Sven Vollbehr <svollbehr@gmail.com>
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* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Rev$
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*/
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final class ISO14496_Box_STSZ extends ISO14496_Box_Full
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{
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/** @var integer */
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private $_sampleSize;
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/** @var Array */
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private $_sampleSizeTable = array();
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/**
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* Constructs the class with given parameters and reads box related data from
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* the ISO Base Media file.
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*
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* @param Reader $reader The reader object.
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*/
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public function __construct($reader, &$options = array())
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{
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parent::__construct($reader, $options);
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$this->_sampleSize = $this->_reader->readUInt32BE();
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$sampleCount = $this->_reader->readUInt32BE();
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if ($this->_sampleSize == 0) {
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$data = $this->_reader->read
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($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
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for ($i = 1; $i <= $sampleCount; $i++)
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$this->_sampleSizeTable[$i] =
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Transform::fromUInt32BE(substr($data, ($i - 1) * 4, 4));
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}
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}
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/**
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* Returns the default sample size. If all the samples are the same size, this
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* field contains that size value. If this field is set to 0, then the samples
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* have different sizes, and those sizes are stored in the sample size table.
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*
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* @return integer
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*/
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public function getSampleSize() { return $this->_sampleSize; }
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/**
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* Returns an array of sample sizes specifying the size of a sample, indexed
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* by its number.
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*
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* @return Array
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*/
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public function getSampleSizeTable()
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{
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return $this->_sampleSizeTable;
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}
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}
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