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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: SimpleIndex.php 108 2008-09-05 17:00:05Z svollbehr $
*/
/**#@+ @ignore */
require_once("ASF/Object.php");
/**#@-*/
/**
* For each video stream in an ASF file, there should be one instance of the
* <i>Simple Index Object</i>. Additionally, the instances of the <i>Simple
* Index Object</i> shall be ordered by stream number.
*
* Index entries in the <i>Simple Index Object</i> are in terms of
* <i>Presentation Times</i>. The corresponding <i>Packet Number</i> field
* values (of the <i>Index Entry</i>, see below) indicate the packet number of
* the ASF <i>Data Packet</i> with the closest past key frame. Note that for
* video streams that contain both key frames and non-key frames, the <i>Packet
* Number</i> field will always point to the closest past key frame.
*
* @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_SimpleIndex extends ASF_Object
{
/** @var string */
private $_fileId;
/** @var integer */
private $_indexEntryTimeInterval;
/** @var integer */
private $_maximumPacketCount;
/** @var Array */
private $_indexEntries = 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->_fileId = $this->_reader->readGUID();
$this->_indexEntryTimeInterval = $this->_reader->readInt64LE();
$this->_maximumPacketCount = $this->_reader->readUInt32LE();
$indexEntriesCount = $this->_reader->readUInt32LE();
for ($i = 0; $i < $indexEntriesCount; $i++) {
$this->_indexEntries[] = array
("packetNumber" => $this->_reader->readUInt32LE(),
"packetCount" => $this->_reader->readUInt16LE());
}
}
/**
* Returns the unique identifier for this ASF file. The value of this field
* should be changed every time the file is modified in any way. The value of
* this field may be set to 0 or set to be identical to the value of the
* <i>File ID</i> field of the <i>Data Object</i> and the <i>Header
* Object</i>.
*
* @return string
*/
public function getFileId() { return $this->_fileId; }
/**
* Returns the time interval between each index entry in 100-nanosecond units.
* The most common value is 10000000, to indicate that the index entries are
* in 1-second intervals, though other values can be used as well.
*
* @return integer
*/
public function getIndexEntryTimeInterval()
{
return $this->_indexEntryTimeInterval;
}
/**
* Returns the maximum <i>Packet Count</i> value of all <i>Index Entries</i>.
*
* @return integer
*/
public function getMaximumPacketCount() { return $this->_maximumPacketCount; }
/**
* Returns an array of index entries. Each entry consists of the following
* keys.
*
* o packetNumber -- Specifies the number of the Data Packet associated
* with this index entry. Note that for video streams that contain both
* key frames and non-key frames, this field will always point to the
* closest key frame prior to the time interval.
*
* o packetCount -- Specifies the number of <i>Data Packets</i> to send at
* this index entry. If a video key frame has been fragmented into two
* Data Packets, the value of this field will be equal to 2.
*
* @return Array
*/
public function getIndexEntries() { return $this->_indexEntries; }
}
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