/**
* Constructs the class with given file and options.
*
* @param string|resource|HausDesign_Io_Reader $filename The path to the file,
* file descriptor of an opened file, or a {@link HausDesign_Io_Reader} instance.
* @param Array $options The options array.
*/
public function __construct($filename, $options = array())
{
if ($filename instanceof HausDesign_Io_Reader) {
$this->_reader =& $filename;
} else {
require_once 'HausDesign/Io/FileReader.php';
try {
$this->_reader = new HausDesign_Io_FileReader($filename);
} catch (HausDesign_Io_Exception $e) {
$this->_reader = null;
require_once 'HausDesign/Media/Mpeg/Exception.php';
throw new HausDesign_Media_Mpeg_Exception($e->getMessage());
}
}
$this->setOptions($options);
$startCode = 0;
$startTime = 0;
$pictureCount = 0;
$pictureRate = 0;
$rates = array(0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60);
$foundSeqHdr = false;
$foundGOP = false;
do {
do {
$startCode = $this->nextStartCode();
} while ($startCode != 0x1b3 && $startCode != 0x1b8);
if ($startCode == 0x1b3 && $pictureRate == 0) {
$i1 = $this->_reader->readUInt32BE();
$i2 = $this->_reader->readUInt32BE();
if (!HausDesign_Bit_Twiddling::testAllBits($i2, 0x2000)) {
require_once 'HausDesign/Media/Mpeg/Exception.php';
throw new HausDesign_Media_Mpeg_Exception('File does not contain a valid MPEG Program Stream (Invalid mark)');
}
$pictureRate = $rates[HausDesign_Bit_Twiddling::getValue($i1, 4, 8)];
$foundSeqHdr = true;
}
if ($startCode == 0x1b8) {
$tmp = $this->_reader->readUInt32BE();
$startTime = ($tmp >> 26 & 0x1f) * 60 * 60 * 1000 + ($tmp >> 20 & 0x3f) * 60 * 1000 + ($tmp >> 13 & 0x3f) * 1000 + (int) (1 / $pictureRate * ($tmp >> 7 & 0x3f) * 1000);
$foundGOP = true;
}
} while (!$foundSeqHdr || !$foundGOP);
$this->_reader->setOffset($this->_reader->getSize());
do {
if (($startCode = $this->prevStartCode()) == 0x100) {
$pictureCount++;
}
} while ($startCode != 0x1b8);
$this->_reader->skip(4);
$tmp = $this->_reader->readUInt32BE();
$this->_length = (($tmp >> 26 & 0x1f) * 60 * 60 * 1000 + ($tmp >> 20 & 0x3f) * 60 * 1000 + ($tmp >> 13 & 0x3f) * 1000 + (int) (1 / $pictureRate * ($tmp >> 7 & 0x3f) * 1000) - $startTime + (int) (1 / $pictureRate * $pictureCount * 1000)) / 1000;
}
/**
* Constructs the class with given parameters and reads object related data
* from the frame.
*
* @param HausDesign_Io_Reader $reader The reader object.
* @param Array $options Array of options.
*/
public function __construct($reader, &$options = array())
{
parent::__construct($reader, $options);
$this->_offset = $this->_reader->getOffset();
$header = null;
for ($i = 0; $i < 5775; $i++) {
$header = $this->_reader->readUInt32BE();
if (HausDesign_Bit_Twiddling::testAllBits(HausDesign_Bit_Twiddling::getValue($header, 21, 32), 0xffe)) {
break;
}
$this->_reader->setOffset(++$this->_offset + 1);
if ($this->_offset == $this->_reader->getSize() || $i == 5775 - 1) {
require_once 'HausDesign/Media/Mpeg/Exception.php';
throw new HausDesign_Media_Mpeg_Exception('File does not contain a valid MPEG Audio Bit Stream (Invalid frame sync and resynchronization failed)');
}
}
$this->_version = HausDesign_Bit_Twiddling::getValue($header, 19, 20);
$this->_frequencyType = HausDesign_Bit_Twiddling::testBit($header, 19);
$this->_layer = HausDesign_Bit_Twiddling::getValue($header, 17, 18);
$this->_redundancy = !HausDesign_Bit_Twiddling::testBit($header, 16);
$this->_bitrate = isset(self::$bitrates[$this->_frequencyType][$this->_layer][$index = HausDesign_Bit_Twiddling::getValue($header, 12, 15)]) ? self::$bitrates[$this->_frequencyType][$this->_layer][$index] : false;
$this->_samplingFrequency = isset(self::$samplingFrequencies[$this->_version][$index = HausDesign_Bit_Twiddling::getValue($header, 10, 11)]) ? self::$samplingFrequencies[$this->_version][$index] : false;
$this->_padding = HausDesign_Bit_Twiddling::testBit($header, 9);
$this->_mode = HausDesign_Bit_Twiddling::getValue($header, 6, 7);
$this->_modeExtension = HausDesign_Bit_Twiddling::getValue($header, 4, 5);
$this->_copyright = HausDesign_Bit_Twiddling::testBit($header, 3);
$this->_original = HausDesign_Bit_Twiddling::testBit($header, 2);
$this->_emphasis = HausDesign_Bit_Twiddling::getValue($header, 0, 1);
$this->_length = (int) (self::$coefficients[$this->_frequencyType][$this->_layer] * ($this->_bitrate * 1000) / $this->_samplingFrequency + ($this->_padding ? 1 : 0)) * self::$slotsizes[$this->_layer];
$this->_samples = self::$samples[$this->_frequencyType][$this->_layer];
if ($this->getOption('readmode', 'lazy') == 'full') {
$this->_readCrc();
$this->_readData();
}
$this->_reader->skip($this->_length - 4);
}