01ba3eacdb
git-svn-id: http://php-reader.googlecode.com/svn/trunk@89 51a70ab9-7547-0410-9469-37e369ee0574
178 lines
6.3 KiB
PHP
178 lines
6.3 KiB
PHP
<?php
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/**
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* PHP Reader Library
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*
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* Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the project workgroup nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package php-reader
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* @subpackage ISO 14496
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* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Id$
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*/
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/**#@+ @ignore */
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require_once("ISO14496/Box/Full.php");
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/**#@-*/
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/**
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* The <i>Track Header Box</i> specifies the characteristics of a single track.
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* Exactly one Track Header Box is contained in a track.
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*
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* In the absence of an edit list, the presentation of a track starts at the
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* beginning of the overall presentation. An empty edit is used to offset the
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* start time of a track.
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*
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* @package php-reader
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* @subpackage ISO 14496
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* @author Sven Vollbehr <svollbehr@gmail.com>
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* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Rev$
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*/
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final class ISO14496_Box_TKHD extends ISO14496_Box_Full
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{
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/** @var integer */
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private $_creationTime;
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/** @var integer */
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private $_modificationTime;
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/** @var integer */
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private $_trackId;
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/** @var integer */
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private $_duration;
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/** @var integer */
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private $_width;
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/** @var integer */
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private $_height;
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/**
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* Indicates that the track is enabled. A disabled track is treated as if it
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* were not present.
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*/
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const TRACK_ENABLED = 1;
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/** Indicates that the track is used in the presentation. */
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const TRACK_IN_MOVIE = 2;
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/** Indicates that the track is used when previewing the presentation. */
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const TRACK_IN_PREVIEW = 4;
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/**
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* Constructs the class with given parameters and reads box related data from
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* the ISO Base Media file.
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*
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* @param Reader $reader The reader object.
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*/
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public function __construct($reader)
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{
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parent::__construct($reader);
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if ($this->getVersion() == 1) {
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$this->_creationTime = $this->_reader->readInt64BE();
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$this->_modificationTime = $this->_reader->readInt64BE();
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$this->_trackId = $this->_reader->readUInt32BE();
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$this->_reader->skip(4);
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$this->_duration = $this->_reader->readInt64BE();
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} else {
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$this->_creationTime = $this->_reader->readUInt32BE();
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$this->_modificationTime = $this->_reader->readUInt32BE();
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$this->_trackId = $this->_reader->readUInt32BE();
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$this->_reader->skip(4);
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$this->_duration = $this->_reader->readUInt32BE();
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}
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$this->_reader->skip(52);
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$this->_width =
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((($tmp = $this->_reader->readUInt32BE()) >> 16) & 0xffff) +
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($tmp & 0xffff) / 10;
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$this->_height =
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((($tmp = $this->_reader->readUInt32BE()) >> 16) & 0xffff) +
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($tmp & 0xffff) / 10;
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}
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/**
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* Returns the creation time of this track in seconds since midnight, Jan. 1,
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* 1904, in UTC time.
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*
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* @return integer
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*/
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public function getCreationTime() { return $this->_creationTime; }
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/**
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* Returns the most recent time the track was modified in seconds since
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* midnight, Jan. 1, 1904, in UTC time.
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*
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* @return integer
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*/
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public function getModificationTime() { return $this->_modificationTime; }
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/**
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* Returns a number that uniquely identifies this track over the entire
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* life-time of this presentation. Track IDs are never re-used and cannot be
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* zero.
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*
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* @return integer
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*/
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public function getTrackId() { return $this->_trackId; }
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/**
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* Returns the duration of this track (in the timescale indicated in the
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* {@link MVHD Movie Header Box}). The value of this field is equal to the sum
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* of the durations of all of the track's edits. If there is no edit list,
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* then the duration is the sum of the sample durations, converted into the
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* timescale in the {@link MVHD Movie Header Box}. If the duration of this
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* track cannot be determined then duration is set to all 32-bit maxint.
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*
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* @return integer
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*/
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public function getDuration() { return $this->_duration; }
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/**
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* Returns the track's visual presentation width. This needs not be the same
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* as the pixel width of the images; all images in the sequence are scaled to
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* this width, before any overall transformation of the track represented by
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* the matrix. The pixel width of the images is the default value.
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*
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* @return integer
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*/
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public function getWidth() { return $this->_rate; }
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/**
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* Returns the track's visual presentation height. This needs not be the same
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* as the pixel height of the images; all images in the sequence are scaled to
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* this height, before any overall transformation of the track represented by
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* the matrix. The pixel height of the images is the default value.
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*
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* @return integer
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*/
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public function getHeight() { return $this->_volume; }
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}
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