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Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SBGP.php')
| -rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SBGP.php | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SBGP.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SBGP.php new file mode 100644 index 0000000..a7b21eb --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SBGP.php @@ -0,0 +1,132 @@ +<?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; + } +} |