ed2748cf6c
git-svn-id: http://php-reader.googlecode.com/svn/branches/zend@174 51a70ab9-7547-0410-9469-37e369ee0574
138 lines
3.7 KiB
PHP
138 lines
3.7 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Media
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* @subpackage MPEG
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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/**#@+ @ignore */
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require_once 'Zend/Bit/Twiddling.php';
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require_once 'Zend/Media/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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* @category Zend
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* @package Zend_Media
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* @subpackage MPEG
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* @author Ryan Butterfield <buttza@gmail.com>
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* @author Sven Vollbehr <sven@vollbehr.eu>
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* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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class Zend_Media_Mpeg_Abs_XingHeader extends Zend_Media_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 Zend_Io_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 = $reader->readUInt32BE();
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if (Zend_Bit_Twiddling::testAnyBits($flags, 0x1)) {
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$this->_frames = $this->_reader->readUInt32BE();
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}
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if (Zend_Bit_Twiddling::testAnyBits($flags, 0x2)) {
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$this->_bytes = $this->_reader->readUInt32BE();
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}
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if (Zend_Bit_Twiddling::testAnyBits($flags, 0x4)) {
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$this->_toc = array_merge(unpack('C*', $this->_reader->read(100)));
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}
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if (Zend_Bit_Twiddling::testAnyBits($flags, 0x8)) {
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$this->_qualityIndicator = $this->_reader->readUInt32BE();
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}
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}
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/**
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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()
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{
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return $this->_frames;
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}
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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()
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{
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return $this->_bytes;
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}
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/**
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* Returns the table of contents array. The returned array has a fixed
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* amount 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()
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{
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return $this->_toc;
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}
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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()
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{
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return $this->_qualityIndicator;
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}
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/**
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* Returns the length of the header in bytes.
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*
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* @return integer
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*/
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public function getLength()
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{
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return 4 +
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($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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