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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 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: CO64.php 92 2008-05-10 13:43:14Z svollbehr $
*/
/**#@+ @ignore */
require_once("ISO14496/Box/Full.php");
/**#@-*/
/**
* The <i>Chunk Offset Box</i> table gives the index of each chunk into the
* containing file. There are two variants, permitting the use of 32-bit or
* 64-bit offsets. The latter is useful when managing very large presentations.
* At most one of these variants will occur in any single instance of a sample
* table.
*
* Offsets are file offsets, not the offset into any box within the file (e.g.
* {@link ISO14496_Box_MDAT Media Data Box}). This permits referring to media
* data in files without any box structure. It does also mean that care must be
* taken when constructing a self-contained ISO file with its metadata
* ({@link ISO14496_Box_MOOV Movie Box}) at the front, as the size of the
* {@link ISO14496_Box_MOOV Movie Box} will affect the chunk offsets to the
* media data.
*
* This box variant contains 64-bit offsets.
*
* @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_CO64 extends ISO14496_Box_Full
{
/** @var Array */
private $_chunkOffsetTable = 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++)
$this->_chunkOffsetTable[$i] =
Transform::fromInt64BE(substr($data, ($i - 1) * 8, 8));
}
/**
* Returns an array of values. Each entry has the entry number as its index
* and a 64 bit integer that gives the offset of the start of a chunk into
* its containing media file as its value.
*
* @return Array
*/
public function getChunkOffsetTable() { return $this->_chunkOffsetTable; }
/**
* Sets an array of chunk offsets. Each entry must have the entry number as
* its index and a 64 bit integer that gives the offset of the start of a
* chunk into its containing media file as its value.
*
* @param Array $chunkOffsetTable The chunk offset array.
*/
public function setChunkOffsetTable($chunkOffsetTable)
{
$this->_chunkOffsetTable = $chunkOffsetTable;
}
/**
* Returns the box raw data.
*
* @return string
*/
public function __toString($data = "")
{
$data = Transform::toUInt32BE(count($this->_chunkOffsetTable));
foreach ($this->_chunkOffsetTable as $chunkOffset)
$data .= Transform::toInt64BE($chunkOffset);
return parent::__toString($data);
}
}
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