diff options
Diffstat (limited to 'libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/RVA2.php')
| -rw-r--r-- | libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/RVA2.php | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/RVA2.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/RVA2.php new file mode 100644 index 0000000..bfdd287 --- /dev/null +++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ID3/Frame/RVA2.php @@ -0,0 +1,217 @@ +<?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: RVA2.php 105 2008-07-30 14:56:47Z svollbehr $ + * @since ID3v2.4.0 + */ + +/**#@+ @ignore */ +require_once("ID3/Frame.php"); +/**#@-*/ + +/** + * The <i>Relative volume adjustment (2)</i> frame is a more subjective frame than + * the previous ones. It allows the user to say how much he wants to + * increase/decrease the volume on each channel when the file is played. The + * purpose is to be able to align all files to a reference volume, so that you + * don't have to change the volume constantly. This frame may also be used to + * balance adjust the audio. The volume adjustment is encoded as a fixed point + * decibel value, 16 bit signed integer representing (adjustment*512), giving + * +/- 64 dB with a precision of 0.001953125 dB. E.g. +2 dB is stored as $04 00 + * and -2 dB is $FC 00. + * + * There may be more than one RVA2 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_RVA2 extends ID3_Frame +{ + /** + * The channel type key. + * + * @see $types + * @var string + */ + const channelType = "channelType"; + + /** + * The volume adjustment key. Adjustments are +/- 64 dB with a precision of + * 0.001953125 dB. + * + * @var string + */ + const volumeAdjustment = "volumeAdjustment"; + + /** + * The peak volume key. + * + * @var string + */ + const peakVolume = "peakVolume"; + + /** + * The list of channel types. + * + * @var Array + */ + public static $types = array + ("Other", "Master volume", "Front right", "Front left", "Back right", + "Back left", "Front centre", "Back centre", "Subwoofer"); + + /** @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; + + list ($this->_device, $this->_data) = + $this->explodeString8($this->_data, 2); + + for ($i = $j = 0; $i < 9; $i++) { + $this->_adjustments[$i] = array + (self::channelType => Transform::fromInt8($this->_data[$j++]), + self::volumeAdjustment => + Transform::fromInt16BE(substr($this->_data, $j++, 2)) / 512.0); + $j++; + $bitsInPeak = Transform::fromInt8($this->_data[$j++]); + $bytesInPeak = $bitsInPeak > 0 ? ceil($bitsInPeak / 8) : 0; + switch ($bytesInPeak) { + case 8: + case 7: + case 6: + case 5: + $this->_adjustments[$i][self::peakVolume] = + Transform::fromInt64BE(substr($this->_data, $j, $bytesInPeak)); + break; + case 4: + case 3: + $this->_adjustments[$i][self::peakVolume] = + Transform::fromUInt32BE(substr($this->_data, $j, $bytesInPeak)); + break; + case 2: + $this->_adjustments[$i][self::peakVolume] = + Transform::fromUInt16BE(substr($this->_data, $j, $bytesInPeak)); + break; + case 1: + $this->_adjustments[$i][self::peakVolume] = + Transform::fromUInt8(substr($this->_data, $j, $bytesInPeak)); + } + $j += $bytesInPeak; + } + } + + /** + * 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 volume adjustments for each channel. Volume + * adjustments are arrays themselves containing the following keys: + * channelType, volumeAdjustment, peakVolume. + * + * @return Array + */ + public function getAdjustments() { return $this->_adjustments; } + + /** + * Sets the array of volume adjustments for each channel. Each volume + * adjustment is an array too containing the following keys: channelType, + * volumeAdjustment, peakVolume. + * + * @param Array $adjustments The volume adjustments array. + */ + public function setAdjustments($adjustments) + { + $this->_adjustments = $adjustments; + } + + /** + * Returns the frame raw data. + * + * @return string + */ + public function __toString() + { + $data = $this->_device . "\0"; + foreach ($this->_adjustments as $channel) { + $data .= Transform::toInt8($channel[self::channelType]) . + Transform::toInt16BE($channel[self::volumeAdjustment] * 512); + if (abs($channel[self::peakVolume]) <= 0xff) + $data .= Transform::toInt8(8) . + Transform::toUInt8($channel[self::peakVolume]); + else if (abs($channel[self::peakVolume]) <= 0xffff) + $data .= Transform::toInt8(16) . + Transform::toUInt16BE($channel[self::peakVolume]); + else if (abs($channel[self::peakVolume]) <= 0xffffffff) + $data .= Transform::toInt8(32) . + Transform::toUInt32BE($channel[self::peakVolume]); + else + $data .= Transform::toInt8(64) . + Transform::toInt64BE($channel[self::peakVolume]); // UInt64 + } + $this->setData($data); + return parent::__toString(); + } +} |