diff options
Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SDTP.php')
| -rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SDTP.php | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SDTP.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SDTP.php new file mode 100644 index 0000000..b8f3dc3 --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/SDTP.php @@ -0,0 +1,130 @@ +<?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: SDTP.php 92 2008-05-10 13:43:14Z svollbehr $ + */ + +/**#@+ @ignore */ +require_once("ISO14496/Box/Full.php"); +/**#@-*/ + +/** + * The <i>Independent and Disposable Samples Box</i> optional table answers + * three questions about sample dependency: + * 1) does this sample depend on others (is it an I-picture)? + * 2) do no other samples depend on this one? + * 3) does this sample contain multiple (redundant) encodings of the data at + * this time-instant (possibly with different dependencies)? + * + * In the absence of this table: + * 1) the sync sample table answers the first question; in most video codecs, + * I-pictures are also sync points, + * 2) the dependency of other samples on this one is unknown. + * 3) the existence of redundant coding is unknown. + * + * When performing trick modes, such as fast-forward, it is possible to use the + * first piece of information to locate independently decodable samples. + * Similarly, when performing random access, it may be necessary to locate the + * previous sync point or random access recovery point, and roll-forward from + * the sync point or the pre-roll starting point of the random access recovery + * point to the desired point. While rolling forward, samples on which no others + * depend need not be retrieved or decoded. + * + * The value of sampleIsDependedOn is independent of the existence of redundant + * codings. However, a redundant coding may have different dependencies from the + * primary coding; if redundant codings are available, the value of + * sampleDependsOn documents only the primary coding. + * + * A sample dependency Box may also occur in the {@link ISO14496_Box_TRAF Track + * Fragment Box}. + * + * @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_SDTP extends ISO14496_Box_Full +{ + /** @var Array */ + private $_sampleDependencyTypeTable = 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); + + $data = $this->_reader->read + ($this->getOffset() + $this->getSize() - $this->_reader->getOffset()); + $dataSize = strlen($data); + for ($i = 1; $i <= $dataSize; $i++) + $this->_sampleDependencyTypeTable[$i] = array + ("sampleDependsOn" => (($tmp = Transform::fromInt8 + ($data[$i - 1])) >> 4) & 0x3, + "sampleIsDependedOn" => ($tmp >> 2) & 0x3, + "sampleHasRedundancy" => $tmp & 0x3); + } + + /** + * Returns an array of values. Each entry is an array containing the following + * keys. + * o sampleDependsOn -- takes one of the following four values: + * 0: the dependency of this sample is unknown; + * 1: this sample does depend on others (not an I picture); + * 2: this sample does not depend on others (I picture); + * 3: reserved + * o sampleIsDependedOn -- takes one of the following four values: + * 0: the dependency of other samples on this sample is unknown; + * 1: other samples depend on this one (not disposable); + * 2: no other sample depends on this one (disposable); + * 3: reserved + * o sampleHasRedundancy -- takes one of the following four values: + * 0: it is unknown whether there is redundant coding in this sample; + * 1: there is redundant coding in this sample; + * 2: there is no redundant coding in this sample; + * 3: reserved + * + * @return Array + */ + public function getSampleDependencyTypeTable() + { + return $this->_sampleDependencyTypeTable; + } +} |