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Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STTS.php')
| -rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STTS.php | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STTS.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STTS.php new file mode 100644 index 0000000..ae0e39c --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STTS.php @@ -0,0 +1,110 @@ +<?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: STTS.php 92 2008-05-10 13:43:14Z svollbehr $ + */ + +/**#@+ @ignore */ +require_once("ISO14496/Box/Full.php"); +/**#@-*/ + +/** + * The <i>Decoding Time to Sample Box</i> contains a compact version of a table + * that allows indexing from decoding time to sample number. Other tables give + * sample sizes and pointers, from the sample number. Each entry in the table + * gives the number of consecutive samples with the same time delta, and the + * delta of those samples. By adding the deltas a complete time-to-sample map + * may be built. + * + * The Decoding Time to Sample Box contains decode time delta's: DT(n+1) = DT(n) + * + STTS(n) where STTS(n) is the (uncompressed) table entry for sample n. + * + * The sample entries are ordered by decoding time stamps; therefore the deltas + * are all non-negative. + * + * The DT axis has a zero origin; DT(i) = SUM(for j=0 to i-1 of delta(j)), and + * the sum of all deltas gives the length of the media in the track (not mapped + * to the overall timescale, and not considering any edit list). + * + * The {@link ISO14496_Box_ELST Edit List Box} provides the initial CT value if + * it is non-empty (non-zero). + * + * @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_STTS extends ISO14496_Box_Full +{ + /** @var Array */ + private $_timeToSampleTable = 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 = 1; $i <= $entryCount; $i++) + $this->_timeToSampleTable[$i] = array + ("sampleCount" => + Transform::fromUInt32BE(substr($data, ($i - 1) * 8, 4)), + "sampleDelta" => + Transform::fromUInt32BE(substr($data, $i * 8 - 4, 4))); + } + + /** + * Returns an array of values. Each entry is an array containing the following + * keys. + * o sampleCount -- an integer that counts the number of consecutive samples + * that have the given duration. + * o sampleDelta -- an integer that gives the delta of these samples in the + * time-scale of the media. + * + * @return Array + */ + public function getTimeToSampleTable() + { + return $this->_timeToSampleTable; + } +} |