Data Object contains all of the Data Packets for a file.
* These Data Packets are organized in terms of increasing send times. A Data
* Packet can contain interleaved data from several digital media streams.
* This data can consist of entire objects from one or more streams.
* Alternatively, it can consist of partial objects (fragmentation).
*
* Capabilities provided within the interleave packet definition include:
* o Single or multiple payload types per Data Packet
* o Fixed-size Data Packets
* o Error correction information (optional)
* o Clock information (optional)
* o Redundant sample information, such as presentation time stamp (optional)
*
* @todo Implement optional support for ASF Data Packet parsing
* @package php-reader
* @subpackage ASF
* @author Sven Vollbehr
* @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_Data extends ASF_Object
{
/** @var string */
private $_fileId;
/** @var integer */
private $_totalDataPackets;
/** @var Array */
private $_dataPackets;
/**
* 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->_totalDataPackets = $this->_reader->readInt64LE();
$this->_reader->skip(2);
/* Data packets are not supported
* for ($i = 0; $i < $this->_totalDataPackets; $i++) {
* $this->_dataPackets[] = new ASF_Object_Data_Packet($reader);
* }
*/
}
/**
* Returns the unique identifier for this ASF file. The value of this field
* is changed every time the file is modified in any way. The value of this
* field is identical to the value of the File ID field of the
* Header Object.
*
* @return string
*/
public function getFileId() { return $this->_fileId; }
/**
* Returns the number of ASF Data Packet entries that exist within the Data
* Object. It must be equal to the Data Packet Count field in the
* File Properties Object. The value of this field is invalid if the
* broadcast flag field of the File Properties Object is set to 1.
*
* @return integer
*/
public function getTotalDataPackets() { return $this->_endTime; }
/**
* Returns an array of Data Packets.
*
* @return Array
*/
public function getDataPackets()
{
throw new ASF_Exception("Data packets are not parsed due to optimization.");
}
}