5ab1bb40f6
git-svn-id: http://php-reader.googlecode.com/svn/trunk@108 51a70ab9-7547-0410-9469-37e369ee0574
131 lines
5.3 KiB
PHP
131 lines
5.3 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 ASF
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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("ASF/Object.php");
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/**#@-*/
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/**
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* The <i>Media Object Index Parameters Object</i> supplies information about
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* those streams that actually indexed (there must be at least one stream in an
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* index) by media objects. This object shall be present in the
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* {@link ASF_Object_Header Header Object} if there is a
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* {@link ASF_Object_MediaObjectIndex Media Object Index Object} present in the
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* file.
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*
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* An Index Specifier is required for each stream that will be indexed by the
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* {@link ASF_Object_MediaObjectIndex Media Object Index Object}. These
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* specifiers must exactly match those in the
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* {@link ASF_Object_MediaObjectIndex Media Object Index Object}.
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*
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* @package php-reader
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* @subpackage ASF
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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 ASF_Object_MediaObjectIndexParameters extends ASF_Object
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{
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/** @var string */
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private $_indexEntryCountInterval;
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/** @var Array */
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private $_indexSpecifiers = array();
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/**
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* Constructs the class with given parameters and reads object related data
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* from the ASF file.
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*
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* @param Reader $reader The reader object.
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* @param Array $options The options array.
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*/
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public function __construct($reader, &$options = array())
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{
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parent::__construct($reader, $options);
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$this->_indexEntryCountInterval = $this->_reader->readUInt32LE();
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$indexSpecifiersCount = $this->_reader->readUInt16LE();
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for ($i = 0; $i < $indexSpecifiersCount; $i++) {
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$this->_indexSpecifiers[] = array
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("streamNumber" => $this->_reader->readUInt16LE(),
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"indexType" => $this->_reader->readUInt16LE());
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}
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}
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/**
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* Returns the interval between each index entry by the number of media
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* objects. This value cannot be 0.
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*
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* @return integer
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*/
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public function getIndexEntryCountInterval()
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{
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return $this->_indexEntryCountInterval;
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}
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/**
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* Returns an array of index entries. Each entry consists of the following
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* keys.
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*
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* o streamNumber -- Specifies the stream number that the Index Specifiers
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* refer to. Valid values are between 1 and 127.
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*
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* o indexType -- Specifies the type of index. Values are defined as
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* follows:
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* 1 = Nearest Past Data Packet,
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* 2 = Nearest Past Media Object,
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* 3 = Nearest Past Cleanpoint,
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* 0xff = Frame Number Offset.
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* For a video stream, the Nearest Past Media Object and Nearest Past Data
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* Packet indexes point to the closest data packet containing an entire
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* video frame or first fragment of a video frame; Nearest Past Cleanpoint
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* indexes point to the closest data packet containing an entire video
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* frame (or first fragment of a video frame) that is a key frame; and
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* Frame Number Offset indicates how many more frames need to be read for
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* the given stream, starting with the first frame in the packet pointed
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* to by the index entry, in order to get to the requested frame. Nearest
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* Past Media Object is the most common value. Because ASF payloads do not
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* contain the full frame number, there is often a Frame Number Offset
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* index alongside one of the other types of indexes to allow the user to
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* identify the exact frame being seeked to.
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*
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* @return Array
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*/
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public function getIndexSpecifiers() { return $this->_indexSpecifiers; }
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}
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