diff options
Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/EQU2.php')
-rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/EQU2.php | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/EQU2.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/EQU2.php new file mode 100644 index 0000000..3721121 --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/EQU2.php @@ -0,0 +1,193 @@ +<?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(); + } +} |