/**
* 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);
}
/**
* Constructs the class with given parameters and reads object related data
* from the bitstream.
*
* @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->_version = $this->_reader->readString8(5);
$tmp = $this->_reader->readUInt8();
$this->_revision = HausDesign_Bit_Twiddling::getValue($tmp, 4, 8);
$this->_vbrMethod = HausDesign_Bit_Twiddling::getValue($tmp, 0, 3);
$this->_lowpass = $this->_reader->readUInt8() * 100;
$this->_peakSignalAmplitude = $this->_reader->readUInt32BE();
$tmp = $this->_reader->readUInt16BE();
$this->_radioReplayGain = array('name' => HausDesign_Bit_Twiddling::getValue($tmp, 0, 2), 'originator' => HausDesign_Bit_Twiddling::getValue($tmp, 3, 5), 'absoluteGainAdjustment' => HausDesign_Bit_Twiddling::getValue($tmp, 7, 15) / 10);
$tmp = $this->_reader->readUInt16BE();
$this->_audiophileReplayGain = array('name' => HausDesign_Bit_Twiddling::getValue($tmp, 0, 2), 'originator' => HausDesign_Bit_Twiddling::getValue($tmp, 3, 5), 'absoluteGainAdjustment' => HausDesign_Bit_Twiddling::getValue($tmp, 7, 15) / 10);
$tmp = $this->_reader->readUInt8();
$this->_encodingFlags = HausDesign_Bit_Twiddling::getValue($tmp, 4, 8);
$this->_athType = HausDesign_Bit_Twiddling::getValue($tmp, 0, 3);
$this->_bitrate = $this->_reader->readUInt8();
$tmp = $this->_reader->readUInt32BE();
// Encoder delay fields
$this->_encoderDelaySamples = HausDesign_Bit_Twiddling::getValue($tmp, 20, 31);
$this->_paddedSamples = HausDesign_Bit_Twiddling::getValue($tmp, 8, 19);
// Misc field
$this->_sourceSampleFrequency = HausDesign_Bit_Twiddling::getValue($tmp, 6, 7);
$this->_unwiseSettingsUsed = HausDesign_Bit_Twiddling::testBit($tmp, 5);
$this->_mode = HausDesign_Bit_Twiddling::getValue($tmp, 2, 4);
$this->_noiseShaping = HausDesign_Bit_Twiddling::getValue($tmp, 0, 1);
$this->_mp3Gain = pow(2, $this->_reader->readInt8() / 4);
$tmp = $this->_reader->readUInt16BE();
$this->_surroundInfo = HausDesign_Bit_Twiddling::getValue($tmp, 11, 14);
$this->_presetUsed = HausDesign_Bit_Twiddling::getValue($tmp, 0, 10);
$this->_musicLength = $this->_reader->readUInt32BE();
$this->_musicCrc = $this->_reader->readUInt16BE();
$this->_crc = $this->_reader->readUInt16BE();
}