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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: SBGP.php 92 2008-05-10 13:43:14Z svollbehr $
*/
/**#@+ @ignore */
require_once("ISO14496/Box/Full.php");
/**#@-*/
/**
* The <i>Sample To Group Box</i> table can be used to find the group that a
* sample belongs to and the associated description of that sample group. The
* table is compactly coded with each entry giving the index of the first sample
* of a run of samples with the same sample group descriptor. The sample group
* description ID is an index that refers to a {@link ISO14496_Box_SGPD Sample
* Group Description Box}, which contains entries describing the characteristics
* of each sample group.
*
* There may be multiple instances of this box if there is more than one sample
* grouping for the samples in a track. Each instance of the Sample To Group Box
* has a type code that distinguishes different sample groupings. Within a
* track, there shall be at most one instance of this box with a particular
* grouping type. The associated Sample Group Description shall indicate the
* same value for the grouping type.
*
* @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_SBGP extends ISO14496_Box_Full
{
/** @var integer */
private $_groupingType;
/** @var Array */
private $_sampleToGroupTable = 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);
$groupingType = $this->_reader->readUInt32BE();
$entryCount = $this->_reader->readUInt32BE();
$data = $this->_reader->read
($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
for ($i = 1; $i <= $entryCount; $i++)
$this->_sampleToGroupTable[$i] = array
("sampleCount" =>
Transform::fromUInt32BE(substr($data, ($i - 1) * 8, 4)),
"groupDescriptionIndex" =>
Transform::fromUInt32BE(substr($data, $i * 8 - 4, 4)));
}
/**
* Returns the grouping type that identifies the type (i.e. criterion used to
* form the sample groups) of the sample grouping and links it to its sample
* group description table with the same value for grouping type. At most one
* occurrence of this box with the same value for groupingType shall exist for
* a track.
*
* @return integer
*/
public function getGroupingType()
{
return $this->_groupingType;
}
/**
* Returns an array of values. Each entry is an array containing the following
* keys.
* o sampleCount -- an integer that gives the number of consecutive samples
* with the same sample group descriptor. If the sum of the sample count
* in this box is less than the total sample count, then the reader should
* effectively extend it with an entry that associates the remaining
* samples with no group. It is an error for the total in this box to be
* greater than the sample_count documented elsewhere, and the reader
* behavior would then be undefined.
* o groupDescriptionIndex -- an integer that gives the index of the sample
* group entry which describes the samples in this group. The index ranges
* from 1 to the number of sample group entries in the
* {@link ISO14496_Box_SGPD Sample Group Description Box}, or takes the
* value 0 to indicate that this sample is a member of no group of this
* type.
*
* @return Array
*/
public function getSampleToGroupTable()
{
return $this->_sampleToGroupTable;
}
}
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