/**
* Constructs the class with given parameters and reads object related data
* from the Ogg bitstream.
*
* @param HausDesign_Io_Reader $reader The reader object.
*/
public function __construct($reader)
{
$this->_reader = $reader;
$this->_capturePattern = $this->_reader->read(4);
if ($this->_capturePattern != 'OggS') {
require_once 'HausDesign/Media/Ogg/Exception.php';
throw new HausDesign_Media_Ogg_Exception('Not a valid Ogg bitstream');
}
$this->_streamStructureVersion = $this->_reader->readUInt8();
if ($this->_streamStructureVersion != 0) {
require_once 'HausDesign/Media/Ogg/Exception.php';
throw new HausDesign_Media_Ogg_Exception('Unsupported Ogg stream structure version');
}
$this->_headerTypeFlag = $this->_reader->readUInt8();
$this->_granulePosition = $this->_reader->readInt64LE();
$this->_bitstreamSerialNumber = $this->_reader->readUInt32LE();
$this->_pageSequenceNumber = $this->_reader->readUInt32LE();
$this->_crcChecksum = $this->_reader->readUInt32LE();
$this->_numberPageSegments = $this->_reader->readUInt8();
$this->_segmentTable = array();
for ($i = 0; $i < $this->_numberPageSegments; $i++) {
$this->_segmentTable[] = $this->_reader->readUInt8();
}
$this->_headerSize = $this->_numberPageSegments + 27;
$this->_pageSize = array_sum($this->_segmentTable);
$this->_size = $this->_headerSize + $this->_pageSize;
}
