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Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SUBS.php')
| -rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SUBS.php | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SUBS.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SUBS.php new file mode 100644 index 0000000..83ae8ac --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SUBS.php @@ -0,0 +1,138 @@ +<?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: SUBS.php 92 2008-05-10 13:43:14Z svollbehr $ + */ + +/**#@+ @ignore */ +require_once("ISO14496/Box/Full.php"); +/**#@-*/ + +/** + * The <i>Sub-Sample Information Box</i> is designed to contain sub-sample + * information. + * + * A sub-sample is a contiguous range of bytes of a sample. The specific + * definition of a sub-sample shall be supplied for a given coding system (e.g. + * for ISO/IEC 14496-10, Advanced Video Coding). In the absence of such a + * specific definition, this box shall not be applied to samples using that + * coding system. + * + * If subsample_count is 0 for any entry, then those samples have no subsample + * information and no array follows. The table is sparsely coded; the table + * identifies which samples have sub-sample structure by recording the + * difference in sample-number between each entry. The first entry in the table + * records the sample number of the first sample having sub-sample information. + * + * Note: It is possible to combine subsamplePriority and discardable such that + * when subsamplePriority is smaller than a certain value, discardable is set to + * 1. However, since different systems may use different scales of priority + * values, to separate them is safe to have a clean solution for discardable + * sub-samples. + * + * @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_SUBS extends ISO14496_Box_Full +{ + /** @var Array */ + private $_subSampleTable = 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); + + $entryCount = $this->_reader->readUInt32BE(); + for ($i = 0; $i < $entryCount; $i++) { + $entry = array(); + $entry["sampleDelta"] = $this->_reader->readUInt32BE(); + $entry["subsamples"] = array(); + if (($subsampleCount = $this->_reader->readUInt16BE()) > 0) { + for ($j = 0; $j < $subsampleCount; $j++) { + $subsample = array(); + if ($this->getVersion() == 1) + $subsample["subsampleSize"] = $this->_reader->readUInt32BE(); + else + $subsample["subsampleSize"] = $this->_reader->readUInt16BE(); + $subsample["subsamplePriority"] = $this->_reader->readInt8(); + $subsample["discardable"] = $this->_reader->readInt8(); + $this->_reader->skip(4); + $entry["subsamples"][] = $subsample; + } + $this->_subSampleTable[] = $entry; + } + } + } + + /** + * Returns an array of values. Each entry is an array containing the following + * keys. + * o sampleDelta -- an integer that specifies the sample number of the + * sample having sub-sample structure. It is coded as the difference + * between the desired sample number, and the sample number indicated in + * the previous entry. If the current entry is the first entry, the value + * indicates the sample number of the first sample having sub-sample + * information, that is, the value is the difference between the sample + * number and zero (0). + * o subsamples -- an array of subsample arrays, each containing the + * following keys. + * o subsampleSize -- an integer that specifies the size, in bytes, of + * the current sub-sample. + * o subsamplePriority -- an integer specifying the degradation priority + * for each sub-sample. Higher values of subsamplePriority, indicate + * sub-samples which are important to, and have a greater impact on, + * the decoded quality. + * o discardable -- equal to 0 means that the sub-sample is required to + * decode the current sample, while equal to 1 means the sub-sample is + * not required to decode the current sample but may be used for + * enhancements, e.g., the sub-sample consists of supplemental + * enhancement information (SEI) messages. + * + * @return Array + */ + public function getSubSampleTable() + { + return $this->_subSampleTable; + } +} |