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<?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 ASF
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: IndexParameters.php 108 2008-09-05 17:00:05Z svollbehr $
*/
/**#@+ @ignore */
require_once("ASF/Object.php");
/**#@-*/
/**
* The <i>Index Parameters Object</i> supplies information about those streams
* that are actually indexed (there must be at least one stream in an index) by
* the {@link ASF_Object_Index Index Object} and how they are being indexed.
* This object shall be present in the {@link ASF_Object_Header Header Object}
* if there is an {@link ASF_Object_Index Index Object} present in the file.
*
* An Index Specifier is required for each stream that will be indexed by the
* {@link ASF_Object_Index Index Object}. These specifiers must exactly match
* those in the {@link ASF_Object_Index Index Object}.
*
* @package php-reader
* @subpackage ASF
* @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: 108 $
*/
final class ASF_Object_IndexParameters extends ASF_Object
{
/** @var string */
private $_indexEntryTimeInterval;
/** @var Array */
private $_indexSpecifiers = array();
/**
* Constructs the class with given parameters and reads object related data
* from the ASF file.
*
* @param Reader $reader The reader object.
* @param Array $options The options array.
*/
public function __construct($reader, &$options = array())
{
parent::__construct($reader, $options);
$this->_indexEntryTimeInterval = $this->_reader->readUInt32LE();
$indexSpecifiersCount = $this->_reader->readUInt16LE();
for ($i = 0; $i < $indexSpecifiersCount; $i++) {
$this->_indexSpecifiers[] = array
("streamNumber" => $this->_reader->readUInt16LE(),
"indexType" => $this->_reader->readUInt16LE());
}
}
/**
* Returns the time interval between index entries in milliseconds. This value
* cannot be 0.
*
* @return integer
*/
public function getIndexEntryTimeInterval()
{
return $this->_indexEntryTimeInterval;
}
/**
* Returns an array of index entries. Each entry consists of the following
* keys.
*
* o streamNumber -- Specifies the stream number that the Index Specifiers
* refer to. Valid values are between 1 and 127.
*
* o indexType -- Specifies the type of index. Values are as follows:
* 1 = Nearest Past Data Packet,
* 2 = Nearest Past Media Object, and
* 3 = Nearest Past Cleanpoint.
* The Nearest Past Data Packet indexes point to the data packet whose
* presentation time is closest to the index entry time. The Nearest Past
* Object indexes point to the closest data packet containing an entire
* object or first fragment of an object. The Nearest Past Cleanpoint
* indexes point to the closest data packet containing an entire object
* (or first fragment of an object) that has the Cleanpoint Flag set.
* Nearest Past Cleanpoint is the most common type of index.
*
* @return Array
*/
public function getIndexSpecifiers() { return $this->_indexSpecifiers; }
}
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