Timecode Index Parameters Object supplies information about those * streams that are actually indexed (there must be at least one stream in an * index) by timecodes. All streams referred to in the * {@link ASF_Object_TimecodeIndexParameters Timecode Index Parameters Object} * must have timecode Payload Extension Systems associated with them in the * {@link ASF_Object_ExtendedStreamProperties Extended Stream Properties * Object}. This object shall be present in the {@link ASF_Object_Header Header * Object} if there is a {@link ASF_Object_TimecodeIndex Timecode Index Object} * present in the file. * * An Index Specifier is required for each stream that will be indexed by the * {@link ASF_Object_TimecodeIndex Timecode Index Object}. These specifiers must * exactly match those in the {@link ASF_Object_TimecodeIndex Timecode Index * Object}. * * @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_TimecodeIndexParameters extends ASF_Object { /** @var string */ private $_indexEntryCountInterval; /** @var Array */ private $_indexSpecifiers = array(); /** * 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->_indexEntryCountInterval = $this->_reader->readUInt32LE(); $indexSpecifiersCount = $this->_reader->readUInt16LE(); for ($i = 0; $i < $indexSpecifiersCount; $i++) { $this->_indexSpecifiers[] = array ("streamNumber" => $this->_reader->readUInt16LE(), "indexType" => $this->_reader->readUInt16LE()); } } /** * Returns the interval between each index entry by the number of media * objects. This value cannot be 0. * * @return integer */ public function getIndexEntryCountInterval() { return $this->_indexEntryCountInterval; } /** * Returns an array of index entries. Each entry consists of the following * keys. * * o streamNumber -- Specifies the stream number that the Index Specifiers * refer to. Valid values are between 1 and 127. * * o indexType -- Specifies the type of index. Values are defined as * follows: * 2 = Nearest Past Media Object, * 3 = Nearest Past Cleanpoint (1 is not a valid value). * For a video stream, The Nearest Past Media Object indexes point to the * closest data packet containing an entire video frame or the first * fragment of a video frame, and the Nearest Past Cleanpoint indexes * point to the closest data packet containing an entire video frame (or * first fragment of a video frame) that is a key frame. Nearest Past * Media Object is the most common value. * * @return Array */ public function getIndexSpecifiers() { return $this->_indexSpecifiers; } }