/** * 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); }