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Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STSH.php')
| -rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STSH.php | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STSH.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STSH.php new file mode 100644 index 0000000..8dd6a6d --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STSH.php @@ -0,0 +1,117 @@ +<?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: STSH.php 92 2008-05-10 13:43:14Z svollbehr $ + */ + +/**#@+ @ignore */ +require_once("ISO14496/Box/Full.php"); +/**#@-*/ + +/** + * The <i>Shadow Sync Sample Box</i> table provides an optional set of sync + * samples that can be used when seeking or for similar purposes. In normal + * forward play they are ignored. + * + * Each entry in the Shadow Sync Table consists of a pair of sample numbers. The + * first entry (shadowedSampleNumber) indicates the number of the sample that a + * shadow sync will be defined for. This should always be a non-sync sample + * (e.g. a frame difference). The second sample number (syncSampleNumber) + * indicates the sample number of the sync sample (i.e. key frame) that can be + * used when there is a random access at, or before, the shadowedSampleNumber. + * + * The shadow sync samples are normally placed in an area of the track that is + * not presented during normal play (edited out by means of an edit list), + * though this is not a requirement. The shadow sync table can be ignored and + * the track will play (and seek) correctly if it is ignored (though perhaps not + * optimally). + * + * The Shadow Sync Sample replaces, not augments, the sample that it shadows + * (i.e. the next sample sent is shadowedSampleNumber+1). The shadow sync sample + * is treated as if it occurred at the time of the sample it shadows, having the + * duration of the sample it shadows. + * + * Hinting and transmission might become more complex if a shadow sample is used + * also as part of normal playback, or is used more than once as a shadow. In + * this case the hint track might need separate shadow syncs, all of which can + * get their media data from the one shadow sync in the media track, to allow + * for the different time-stamps etc. needed in their headers. + * + * @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_STSH extends ISO14496_Box_Full +{ + /** @var Array */ + private $_shadowSyncSampleTable = 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(); + $data = $this->_reader->read + ($this->getOffset() + $this->getSize() - $this->_reader->getOffset()); + for ($i = 0; $i < $entryCount; $i++) + $this->_shadowSyncSampleTable[$i] = array + ("shadowedSampleNumber" => + Transform::fromUInt32BE(substr($data, ($i - 1) * 8, 4)), + "syncSampleNumber" => + Transform::fromUInt32BE(substr($data, $i * 8 - 4, 4))); + } + + /** + * Returns an array of values. Each entry is an array containing the following + * keys. + * o shadowedSampleNumber - gives the number of a sample for which there is + * an alternative sync sample. + * o syncSampleNumber - gives the number of the alternative sync sample. + * + * @return Array + */ + public function getShadowSyncSampleTable() + { + return $this->_shadowSyncSampleTable; + } +} |