File size: 5.29Kb
<?php
/**
* This file contains the implementation for RBUF frame
*
* PHP version
*
* Copyright (C) 2006-2007 Alexander Merz
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* @category File_Formats
* @package MP3_IDv2
* @author Alexander Merz <alexander.merz@web.de>
* @copyright 2006 Alexander Merz
* @license http://www.gnu.org/licenses/lgpl.html LGPL 2.1
* @version CVS: $Id: RBUF.php 248624 2007-12-20 19:07:33Z alexmerz $
* @link http://pear.php.net/package/MP3_IDv2
* @since File available since Release 0.1
*/
/**
* load parent class
*/
require_once 'MP3/IDv2/Frame.php';
/**
* Data stucture for RBUF frame in a tag.
* (Recommended buffer size)
*
* @category File_Formats
* @package MP3_IDv2
* @author Alexander Merz <alexander.merz@web.de>
* @copyright 2006-2007 The PHP Group
* @license http://www.gnu.org/licenses/lgpl.html LGPL 2.1
* @version Release: @package_version@
* @link http://pear.php.net/package/MP3_IDv2
* @since Class available since Release 0.1.0
*/
class MP3_IDv2_Frame_RBUF extends MP3_IDv2_Frame
{
/**
* the buffer size
* @var int
*/
private $buffer = 0;
/**
* embedded flag
* @var bool
*/
private $_emb = false;
/**
* the offset to next flag
* @var int
*/
private $_next = 0;
/**
* Sets the buffer size.
*
* @param int $c buffer size
*
* @return void
* @access public
*/
public function setBufferSize($c)
{
$this->_changed = true;
$this->_buffer = $c;
}
/**
* Returns the buffer size.
*
* @return int the buffer size
* @access public
*/
public function getBufferSize()
{
return $this->_buffer;
}
/**
* Sets the embedded flag.
*
* @param bool $b embedded flag
*
* @return void
* @access public
*/
public function useEmbedding($b = true)
{
$this->_changed = true;
$this->_emb = $b;
}
/**
* Returns the embedded flag
*
* @return bool true if flag is set
* @access public
*/
public function isEmbedded()
{
return $this->_emb;
}
/**
* Sets the offset to the next tag containing this frame
*
* @param int $offset the offset
*
* @return void
* @access public
*/
public function setOffsetToNextTag($offset)
{
$this->_changed = true;
$this->_offset = $offset;
}
/**
* Returns the offset to the next tag containing this frame
*
* @return string the email address
* @access public
*/
public function getOffsetToNextTag()
{
return $this->_offset;
}
/**
* Creates the content of the frame (encoding+language+tou)
*
* @return string the frame content
* @access public
* @todo this look like a bug here
*/
public function createContent()
{
$size = str_pad(decbin($this->getBufferSize()), 32, "0", STR_PAD_LEFT);
$size = substr($size, 3);
$flag = bindec("00000000");
if ($this->isEmbedded()) {
$flag = bindec("00000001");
}
// TODO bug?
return $size.
pack("C", decbin($flag)).
pack("N", $this->getOffsetToNextTag());
}
/**
* Sets the data of the frame and processes it.
*
* @param string $content the unproccess content for the frame
*
* @return void
* @access public
*/
public function setRawContent($content)
{
$this->_changed = true;
$this->_content = $content;
$s = substr($content, 0,3);
$sa = '';
for ($i=2; $i>=0; $i--) {
$sa = $sa.decbin($s[$i]);
}
$this->setBufferSize(bindec($sa));
$flag = substr($content, 3, 1);
if ($flag & bindec("00000001")) {
$this->setEmbedded();
}
$n = substr($content, 4);
$na = '';
for ($i=3; $i>=0; $i--) {
$na = $na.decbin($n[$i]);
}
$this->setOffsetToNextTag(bindec($na));
}
/**
* Sets the id and the purpose of the frame
*
* @return void
* @access public
*/
public function __construct()
{
$this->_id = "RBUF";
$this->_purpose = "Recommended buffer size";
}
/**
* Returns the frame content as something printable
*
* @return string the frame content
* @access public
*/
public function toString()
{
return $this->getID()." (".$this->getPurpose().") ".
$this->getBufferSize()." ".$this->getOffsetToNextTag();
}
}
?>