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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();
+ }
+}