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<?php
/**
* PHP Reader Library
*
* Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the project workgroup nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @package php-reader
* @subpackage ID3
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Id: EQU2.php 105 2008-07-30 14:56:47Z svollbehr $
* @since ID3v2.4.0
*/
/**#@+ @ignore */
require_once("ID3/Frame.php");
/**#@-*/
/**
* The <i>Equalisation (2)</i> is another subjective, alignment frame. It allows
* the user to predefine an equalisation curve within the audio file. There may
* be more than one EQU2 frame in each tag, but only one with the same
* identification string.
*
* @package php-reader
* @subpackage ID3
* @author Sven Vollbehr <svollbehr@gmail.com>
* @author Ryan Butterfield <buttza@gmail.com>
* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
* @license http://code.google.com/p/php-reader/wiki/License New BSD License
* @version $Rev: 105 $
* @since ID3v2.4.0
*/
final class ID3_Frame_EQU2 extends ID3_Frame
{
/**
* Interpolation type that defines that no interpolation is made. A jump from
* one adjustment level to another occurs in the middle between two adjustment
* points.
*/
const BAND = 0;
/**
* Interpolation type that defines that interpolation between adjustment
* points is linear.
*/
const LINEAR = 1;
/** @var integer */
private $_interpolation;
/** @var string */
private $_device;
/** @var Array */
private $_adjustments;
/**
* Constructs the class with given parameters and parses object related data.
*
* @param Reader $reader The reader object.
* @param Array $options The options array.
*/
public function __construct($reader = null, &$options = array())
{
parent::__construct($reader, $options);
if ($reader === null)
return;
$this->_interpolation = Transform::fromInt8($this->_data[0]);
list ($this->_device, $this->_data) =
$this->explodeString8(substr($this->_data, 1), 2);
for ($i = 0; $i < strlen($this->_data); $i += 4)
$this->_adjustments
[(int)(Transform::fromUInt16BE(substr($this->_data, $i, 2)) / 2)] =
Transform::fromInt16BE(substr($this->_data, $i + 2, 2)) / 512.0;
ksort($this->_adjustments);
}
/**
* Returns the interpolation method. The interpolation method describes which
* method is preferred when an interpolation between the adjustment point that
* follows.
*
* @return integer
*/
public function getInterpolation() { return $this->_interpolation; }
/**
* Sets the interpolation method. The interpolation method describes which
* method is preferred when an interpolation between the adjustment point that
* follows.
*
* @param integer $interpolation The interpolation method code.
*/
public function setInterpolation($interpolation)
{
$this->_interpolation = $interpolation;
}
/**
* Returns the device where the adjustments should apply.
*
* @return string
*/
public function getDevice() { return $this->_device; }
/**
* Sets the device where the adjustments should apply.
*
* @param string $device The device.
*/
public function setDevice($device) { $this->_device = $device; }
/**
* Returns the array containing adjustments having frequencies as keys and
* their corresponding adjustments as values.
*
* Adjustment points are ordered by frequency.
*
* @return Array
*/
public function getAdjustments() { return $this->_adjustments; }
/**
* Adds a volume adjustment setting for given frequency. The frequency can
* have a value from 0 to 32767 Hz, and the adjustment </> +/- 64 dB with a
* precision of 0.001953125 dB.
*
* @param integer $frequency The frequency, in hertz.
* @param integer $adjustment The adjustment, in dB.
*/
public function addAdjustment($frequency, $adjustment)
{
$this->_adjustments[$frequency] = $adjustment;
ksort($this->_adjustments);
}
/**
* Sets the adjustments array. The array must have frequencies as keys and
* their corresponding adjustments as values. The frequency can have a value
* from 0 to 32767 Hz, and the adjustment </> +/- 64 dB with a precision of
* 0.001953125 dB. One frequency should only be described once in the frame.
*
* @param Array $adjustments The adjustments array.
*/
public function setAdjustments($adjustments)
{
$this->_adjustments = $adjustments;
ksort($this->_adjustments);
}
/**
* Returns the frame raw data.
*
* @return string
*/
public function __toString()
{
$data = Transform::toInt8($this->_interpolation) . $this->_device . "\0";
foreach ($this->_adjustments as $frequency => $adjustment)
$data .= Transform::toUInt16BE($frequency * 2) .
Transform::toInt16BE($adjustment * 512);
$this->setData($data);
return parent::__toString();
}
}
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