a97d59bf89
git-svn-id: http://php-reader.googlecode.com/svn/trunk@92 51a70ab9-7547-0410-9469-37e369ee0574
98 lines
3.9 KiB
PHP
98 lines
3.9 KiB
PHP
<?php
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/**
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* PHP Reader Library
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*
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* Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the project workgroup nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package php-reader
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* @subpackage ISO 14496
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* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Id$
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*/
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/**#@+ @ignore */
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require_once("ISO14496/Box/Full.php");
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/**#@-*/
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/**
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* The <i>Progressive Download Information Box</i> aids the progressive download
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* of an ISO file. The box contains pairs of numbers (to the end of the box)
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* specifying combinations of effective file download bitrate in units of
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* bytes/sec and a suggested initial playback delay in units of milliseconds.
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*
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* A receiving party can estimate the download rate it is experiencing, and from
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* that obtain an upper estimate for a suitable initial delay by linear
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* interpolation between pairs, or by extrapolation from the first or last
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* entry.
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*
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* @package php-reader
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* @subpackage ISO 14496
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* @author Sven Vollbehr <svollbehr@gmail.com>
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* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Rev$
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*/
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final class ISO14496_Box_PDIN extends ISO14496_Box_Full
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{
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/** @var Array */
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private $_progressiveDownloadInfo = array();
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/**
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* Constructs the class with given parameters and reads box related data from
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* the ISO Base Media file.
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*
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* @param Reader $reader The reader object.
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*/
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public function __construct($reader, &$options = array())
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{
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parent::__construct($reader, $options);
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while ($this->_reader->getOffset() < $this->getOffset() + $this->getSize())
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$this->_progressiveDownloadInfo[] = array
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("rate" => $this->_reader->readUInt32BE(),
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"initialDelay" => $this->_reader->readUInt32BE());
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}
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/**
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* Returns the progressive download information array. The array consists of
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* items having two keys.
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*
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* o rate -- the download rate expressed in bytes/second
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* o initialDelay -- the suggested delay to use when playing the file,
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* such that if download continues at the given rate, all data within the
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* file will arrive in time for its use and playback should not need to
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* stall.
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*
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* @return Array
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*/
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public function getProgressiveDownloadInfo()
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{
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return $this->_progressiveDownloadInfo;
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}
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}
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