4b68a78dc8
git-svn-id: http://php-reader.googlecode.com/svn/trunk@140 51a70ab9-7547-0410-9469-37e369ee0574
133 lines
4.3 KiB
PHP
133 lines
4.3 KiB
PHP
<?php
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/**
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* PHP Reader Library
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*
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* Copyright (c) 2008-2009 The PHP Reader Project Workgroup. All rights
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* 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 ID3
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* @copyright Copyright (c) 2008-2009 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("ID3/Frame.php");
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require_once("ID3/Timing.php");
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/**#@-*/
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/**
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* The <i>Position synchronisation frame</i> delivers information to the
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* listener of how far into the audio stream he picked up; in effect, it states
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* the time offset from the first frame in the stream. There may only be one
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* POSS frame in each tag.
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*
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* @package php-reader
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* @subpackage ID3
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* @author Sven Vollbehr <svollbehr@gmail.com>
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* @author Ryan Butterfield <buttza@gmail.com>
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* @copyright Copyright (c) 2008-2009 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 ID3_Frame_POSS extends ID3_Frame
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implements ID3_Timing
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{
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/** @var integer */
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private $_format = ID3_Timing::MPEG_FRAMES;
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/** @var integer */
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private $_position;
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/**
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* Constructs the class with given parameters and parses object related data.
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*
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* @param Reader $reader The reader object.
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* @param Array $options The options array.
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*/
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public function __construct($reader = null, &$options = array())
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{
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parent::__construct($reader, $options);
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if ($reader === null)
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return;
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$this->_format = Transform::fromUInt8($this->_data[0]);
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$this->_position = Transform::fromUInt32BE(substr($this->_data, 1, 4));
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}
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/**
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* Returns the timing format.
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*
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* @return integer
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*/
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public function getFormat() { return $this->_format; }
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/**
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* Sets the timing format.
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*
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* @see ID3_Timing
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* @param integer $format The timing format.
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*/
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public function setFormat($format) { $this->_format = $format; }
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/**
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* Returns the position where in the audio the listener starts to receive,
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* i.e. the beginning of the next frame.
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*
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* @return integer
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*/
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public function getPosition() { return $this->_position; }
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/**
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* Sets the position where in the audio the listener starts to receive,
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* i.e. the beginning of the next frame, using given format.
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*
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* @param integer $position The position.
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* @param integer $format The timing format.
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*/
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public function setPosition($position, $format = false)
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{
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$this->_position = $position;
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if ($format !== false)
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$this->_format = $format;
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}
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/**
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* Returns the frame raw data without the header.
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*
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* @return string
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*/
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protected function _getData()
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{
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return
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Transform::toUInt8($this->_format) .
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Transform::toUInt32BE($this->_position);
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}
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}
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