a97d59bf89
git-svn-id: http://php-reader.googlecode.com/svn/trunk@92 51a70ab9-7547-0410-9469-37e369ee0574
131 lines
5.6 KiB
PHP
131 lines
5.6 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>Independent and Disposable Samples Box</i> optional table answers
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* three questions about sample dependency:
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* 1) does this sample depend on others (is it an I-picture)?
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* 2) do no other samples depend on this one?
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* 3) does this sample contain multiple (redundant) encodings of the data at
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* this time-instant (possibly with different dependencies)?
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*
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* In the absence of this table:
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* 1) the sync sample table answers the first question; in most video codecs,
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* I-pictures are also sync points,
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* 2) the dependency of other samples on this one is unknown.
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* 3) the existence of redundant coding is unknown.
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*
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* When performing trick modes, such as fast-forward, it is possible to use the
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* first piece of information to locate independently decodable samples.
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* Similarly, when performing random access, it may be necessary to locate the
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* previous sync point or random access recovery point, and roll-forward from
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* the sync point or the pre-roll starting point of the random access recovery
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* point to the desired point. While rolling forward, samples on which no others
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* depend need not be retrieved or decoded.
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*
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* The value of sampleIsDependedOn is independent of the existence of redundant
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* codings. However, a redundant coding may have different dependencies from the
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* primary coding; if redundant codings are available, the value of
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* sampleDependsOn documents only the primary coding.
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*
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* A sample dependency Box may also occur in the {@link ISO14496_Box_TRAF Track
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* Fragment Box}.
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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_SDTP extends ISO14496_Box_Full
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{
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/** @var Array */
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private $_sampleDependencyTypeTable = 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, $options);
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$data = $this->_reader->read
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($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
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$dataSize = strlen($data);
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for ($i = 1; $i <= $dataSize; $i++)
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$this->_sampleDependencyTypeTable[$i] = array
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("sampleDependsOn" => (($tmp = Transform::fromInt8
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($data[$i - 1])) >> 4) & 0x3,
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"sampleIsDependedOn" => ($tmp >> 2) & 0x3,
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"sampleHasRedundancy" => $tmp & 0x3);
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}
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/**
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* Returns an array of values. Each entry is an array containing the following
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* keys.
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* o sampleDependsOn -- takes one of the following four values:
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* 0: the dependency of this sample is unknown;
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* 1: this sample does depend on others (not an I picture);
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* 2: this sample does not depend on others (I picture);
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* 3: reserved
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* o sampleIsDependedOn -- takes one of the following four values:
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* 0: the dependency of other samples on this sample is unknown;
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* 1: other samples depend on this one (not disposable);
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* 2: no other sample depends on this one (disposable);
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* 3: reserved
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* o sampleHasRedundancy -- takes one of the following four values:
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* 0: it is unknown whether there is redundant coding in this sample;
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* 1: there is redundant coding in this sample;
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* 2: there is no redundant coding in this sample;
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* 3: reserved
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*
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* @return Array
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*/
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public function getSampleDependencyTypeTable()
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{
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return $this->_sampleDependencyTypeTable;
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}
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}
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