3a7d13274d
git-svn-id: http://php-reader.googlecode.com/svn/trunk@120 51a70ab9-7547-0410-9469-37e369ee0574
137 lines
4.5 KiB
PHP
137 lines
4.5 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 MPEG
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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: XINGHeader.php 1 2008-07-06 10:43:41Z rbutterfield $
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*/
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/**#@+ @ignore */
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require_once("Reader.php");
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require_once("Twiddling.php");
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require_once("MPEG/ABS/Object.php");
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/**#@-*/
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/**
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* This class represents the Xing VBR header which is often found in the first
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* frame of an MPEG Audio Bit Stream.
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*
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* @package php-reader
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* @subpackage MPEG
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* @author Ryan Butterfield <buttza@gmail.com>
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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: 1 $
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*/
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class MPEG_ABS_XINGHeader extends MPEG_ABS_Object
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{
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/** @var integer */
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private $_frames = false;
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/** @var integer */
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private $_bytes = false;
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/** @var Array */
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private $_toc = array();
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/** @var integer */
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private $_qualityIndicator = false;
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/**
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* Constructs the class with given parameters and reads object related data
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* from the bitstream.
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*
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* @param Reader $reader The reader object.
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* @param Array $options Array of options.
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*/
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public function __construct($reader, &$options = array())
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{
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parent::__construct($reader, $options);
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$flags = $reader->readUInt32BE();
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if (Twiddling::testAnyBits($flags, 0x1))
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$this->_frames = $this->_reader->readUInt32BE();
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if (Twiddling::testAnyBits($flags, 0x2))
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$this->_bytes = $this->_reader->readUInt32BE();
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if (Twiddling::testAnyBits($flags, 0x4))
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$this->_toc = array_merge(unpack("C*", $this->_reader->read(100)));
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if (Twiddling::testAnyBits($flags, 0x8))
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$this->_qualityIndicator = $this->_reader->readUInt32BE();
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}
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/**
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* Returns the number of frames in the file.
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*
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* @return integer
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*/
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public function getFrames() { return $this->_frames; }
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/**
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* Returns the number of bytes in the file.
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*
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* @return integer
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*/
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public function getBytes() { return $this->_bytes; }
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/**
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* Returns the table of contents array. The returned array has a fixed amount
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* of 100 seek points to the file.
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*
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* @return Array
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*/
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public function getToc() { return $this->_toc; }
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/**
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* Returns the quality indicator. The indicator is from 0 (best quality) to
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* 100 (worst quality).
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*
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* @return integer
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*/
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public function getQualityIndicator() { return $this->_qualityIndicator; }
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/**
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* Returns the length of the header in bytes.
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*
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* @return integer
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*/
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public function getLength()
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{
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return 4 +
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($this->_frames !== false ? 4 : 0) +
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($this->_bytes !== false ? 4 : 0) +
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(empty($this->_toc) ? 0 : 100) +
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($this->_qualityIndicator !== false ? 4 : 0);
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}
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}
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