1b8eed275f
git-svn-id: http://php-reader.googlecode.com/svn/trunk@138 51a70ab9-7547-0410-9469-37e369ee0574
482 lines
13 KiB
PHP
482 lines
13 KiB
PHP
<?php
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/**
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* PHP Reader Library
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*
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* Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the project workgroup nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package php-reader
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* @subpackage MPEG
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* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Id$
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*/
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/**#@+ @ignore */
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require_once("Reader.php");
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require_once("Twiddling.php");
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require_once("MPEG/ABS/Object.php");
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/**#@-*/
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/**
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* This class represents a LAME extension to the Xing VBR header. The purpose of
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* this header is to provide extra information about the audio bistream, encoder
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* and parameters used. This header should, as much as possible, be meaningfull
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* for as many encoders as possible, even if it is unlikely that other encoders
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* than LAME will implement it.
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*
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* This header should be backward compatible with the Xing VBR tag, providing
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* basic support for a lot of already written software. As much as possible the
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* current revision (revision 1) should provide information similar to the one
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* already provided by revision 0.
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*
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* @package php-reader
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* @subpackage MPEG
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* @author Sven Vollbehr <svollbehr@gmail.com>
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* @copyright Copyright (c) 2008 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Rev$
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*/
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class MPEG_ABS_LAMEHeader extends MPEG_ABS_Object
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{
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/** @var integer */
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const VBR_METHOD_CONSTANT = 1;
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/** @var integer */
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const VBR_METHOD_ABR = 2;
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/** @var integer */
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const VBR_METHOD_RH = 3;
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/** @var integer */
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const VBR_METHOD_MTRH = 4;
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/** @var integer */
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const VBR_METHOD_MT = 5;
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/** @var integer */
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const ENCODING_FLAG_NSPSYTUNE = 1;
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/** @var integer */
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const ENCODING_FLAG_NSSAFEJOINT = 2;
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/** @var integer */
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const ENCODING_FLAG_NOGAP_CONTINUED = 4;
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/** @var integer */
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const ENCODING_FLAG_NOGAP_CONTINUATION = 8;
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/** @var integer */
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const MODE_MONO = 0;
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/** @var integer */
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const MODE_STEREO = 1;
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/** @var integer */
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const MODE_DUAL = 2;
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/** @var integer */
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const MODE_JOINT = 3;
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/** @var integer */
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const MODE_FORCE = 4;
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/** @var integer */
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const MODE_AUTO = 5;
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/** @var integer */
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const MODE_INTENSITY = 6;
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/** @var integer */
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const MODE_UNDEFINED = 7;
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/** @var integer */
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const SOURCE_FREQUENCY_32000_OR_LOWER = 0;
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/** @var integer */
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const SOURCE_FREQUENCY_44100 = 1;
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/** @var integer */
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const SOURCE_FREQUENCY_48000 = 2;
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/** @var integer */
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const SOURCE_FREQUENCY_HIGHER = 3;
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/** @var integer */
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const SURROUND_NONE = 0;
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/** @var integer */
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const SURROUND_DPL = 1;
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/** @var integer */
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const SURROUND_DPL2 = 2;
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/** @var integer */
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const SURROUND_AMBISONIC = 3;
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/** @var string */
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private $_version;
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/** @var integer */
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private $_revision;
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/** @var integer */
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private $_vbrMethod;
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/** @var integer */
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private $_lowpass;
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/** @var integer */
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private $_peakSignalAmplitude;
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/** @var integer */
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private $_radioReplayGain;
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/** @var integer */
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private $_audiophileReplayGain;
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/** @var integer */
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private $_encodingFlags;
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/** @var integer */
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private $_athType;
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/** @var integer */
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private $_bitrate;
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/** @var integer */
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private $_encoderDelaySamples;
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/** @var integer */
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private $_paddedSamples;
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/** @var integer */
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private $_sourceSampleFrequency;
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/** @var boolean */
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private $_unwiseSettingsUsed;
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/** @var integer */
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private $_mode;
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/** @var integer */
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private $_noiseShaping;
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/** @var integer */
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private $_mp3Gain;
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/** @var integer */
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private $_surroundInfo;
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/** @var integer */
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private $_presetUsed;
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/** @var integer */
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private $_musicLength;
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/** @var integer */
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private $_musicCrc;
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/** @var integer */
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private $_crc;
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/**
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* Constructs the class with given parameters and reads object related data
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* from the bitstream.
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*
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* @param Reader $reader The reader object.
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* @param Array $options Array of options.
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*/
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public function __construct($reader, &$options = array())
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{
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parent::__construct($reader, $options);
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$this->_version = $this->_reader->readString8(5);
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$tmp = $this->_reader->readUInt8();
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$this->_revision = Twiddling::getValue($tmp, 4, 8);
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$this->_vbrMethod = Twiddling::getValue($tmp, 0, 3);
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$this->_lowpass = $this->_reader->readUInt8() * 100;
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$this->_peakSignalAmplitude = $this->_reader->readUInt32BE();
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$tmp = $this->_reader->readUInt16BE();
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$this->_radioReplayGain = array(
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"name" => Twiddling::getValue($tmp, 0, 2),
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"originator" => Twiddling::getValue($tmp, 3, 5),
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"absoluteGainAdjustment" => Twiddling::getValue($tmp, 7, 15) / 10
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);
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$tmp = $this->_reader->readUInt16BE();
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$this->_audiophileReplayGain = array(
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"name" => Twiddling::getValue($tmp, 0, 2),
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"originator" => Twiddling::getValue($tmp, 3, 5),
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"absoluteGainAdjustment" => Twiddling::getValue($tmp, 7, 15) / 10
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);
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$tmp = $this->_reader->readUInt8();
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$this->_encodingFlags = Twiddling::getValue($tmp, 4, 8);
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$this->_athType = Twiddling::getValue($tmp, 0, 3);
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$this->_bitrate = $this->_reader->readUInt8();
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$tmp = $this->_reader->readUInt32BE();
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// Encoder delay fields
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$this->_encoderDelaySamples = Twiddling::getValue($tmp, 20, 31);
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$this->_paddedSamples = Twiddling::getValue($tmp, 8, 19);
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// Misc field
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$this->_sourceSampleFrequency = Twiddling::getValue($tmp, 6, 7);
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$this->_unwiseSettingsUsed = Twiddling::testBit($tmp, 5);
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$this->_mode = Twiddling::getValue($tmp, 2, 4);
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$this->_noiseShaping = Twiddling::getValue($tmp, 0, 1);
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$this->_mp3Gain = pow(2, $this->_reader->readInt8() / 4);
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$tmp = $this->_reader->readUInt16BE();
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$this->_surroundInfo = Twiddling::getValue($tmp, 11, 14);
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$this->_presetUsed = Twiddling::getValue($tmp, 0, 10);
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$this->_musicLength = $this->_reader->readUInt32BE();
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$this->_musicCrc = $this->_reader->readUInt16BE();
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$this->_crc = $this->_reader->readUInt16BE();
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}
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/**
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* Returns the version string of the header.
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*
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* @return string
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*/
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public function getVersion() { return $this->_version; }
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/**
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* Returns the info tag revision.
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*
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* @return integer
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*/
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public function getRevision() { return $this->_revision; }
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/**
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* Returns the VBR method used for encoding. See the corresponding constants
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* for possible return values.
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*
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* @return integer
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*/
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public function getVbrMethod() { return $this->_vbrMethod; }
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/**
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* Returns the lowpass filter value.
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*
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* @return integer
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*/
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public function getLowpass() { return $this->_lowpass; }
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/**
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* Returns the peak signal amplitude field of replay gain. The value of 1.0
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* (ie 100%) represents maximal signal amplitude storeable in decoding format.
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*
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* @return integer
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*/
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public function getPeakSignalAmplitude()
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{
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return $this->_peakSignalAmplitude;
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}
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/**
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* Returns the radio replay gain field of replay gain, required to make all
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* tracks equal loudness, as an array that consists of the following keys.
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*
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* o name -- Specifies the name of the gain adjustment. Can be one of the
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* following values: 0 = not set, 1 = radio, or 2 = audiophile.
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*
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* o originator -- Specifies the originator of the gain adjustment. Can be
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* one of the following values: 0 = not set, 1 = set by artist, 2 = set
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* by user, 3 = set by my model, 4 = set by simple RMS average.
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*
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* o absoluteGainAdjustment -- Speficies the absolute gain adjustment.
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*
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* @return Array
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*/
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public function getRadioReplayGain() { return $this->_radioReplayGain; }
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/**
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* Returns the audiophile replay gain field of replay gain, required to give
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* ideal listening loudness, as an array that consists of the following keys.
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*
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* o name -- Specifies the name of the gain adjustment. Can be one of the
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* following values: 0 = not set, 1 = radio, or 2 = audiophile.
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*
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* o originator -- Specifies the originator of the gain adjustment. Can be
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* one of the following values: 0 = not set, 1 = set by artist, 2 = set
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* by user, 3 = set by my model, 4 = set by simple RMS average.
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*
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* o absoluteGainAdjustment -- Speficies the absolute gain adjustment.
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*
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* @return Array
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*/
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public function getAudiophileReplayGain()
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{
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return $this->_audiophileReplayGain;
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}
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/**
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* Returns the encoding flags. See the corresponding flag constants for
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* possible values.
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*
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* @return integer
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*/
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public function getEncodingFlags() { return $this->_encodingFlags; }
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/**
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* Returns the ATH type.
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*
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* @return integer
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*/
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public function getAthType() { return $this->_athType; }
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/**
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* Returns the bitrate for CBR encoded files and the minimal birate for
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* VBR encoded file. The maximum value of this field is 255 even with higher
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* actual bitrates.
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*
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* @return integer
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*/
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public function getBitrate() { return $this->_bitrate; }
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/**
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* Returns the encoder delay or number of samples added at start.
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*
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* @return integer
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*/
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public function getEncoderDelaySamples()
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{
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return $this->_encoderDelaySamples;
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}
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/**
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* Returns the number of padded samples to complete the last frame.
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*
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* @return integer
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*/
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public function getPaddedSamples() { return $this->_paddedSamples; }
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/**
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* Returns the source sample frequency. See corresponding constants for
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* possible values.
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*
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* @return integer
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*/
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public function getSourceSampleFrequency()
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{
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return $this->_sourceSampleFrequency;
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}
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/**
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* An alias to getUnwiseSettingsUsed().
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*
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* @see getUnwiseSettingsUsed
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* @return boolean
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*/
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public function areUnwiseSettingsUsed()
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{
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return $this->getUnwiseSettingsUsed();
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}
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/**
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* Returns whether unwise settings were used to encode the file.
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*
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* @return boolean
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*/
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public function getUnwiseSettingsUsed() { return $this->_unwiseSettingsUsed; }
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/**
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* Returns the stereo mode. See corresponding constants for possible values.
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*
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* @return integer
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*/
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public function getMode() { return $this->_mode; }
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/**
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* Returns the noise shaping.
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*
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* @return integer
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*/
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public function getNoiseShaping() { return $this->_noiseShaping; }
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/**
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* Returns the MP3 gain change. Any MP3 can be amplified in a lossless manner.
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* If done so, this field can be used to log such transformation happened so
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* that any given time it can be undone.
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*
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* @return integer
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*/
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public function getMp3Gain() { return $this->_mp3Gain; }
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/**
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* Returns the surround info. See corresponding contants for possible values.
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*
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* @return integer
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*/
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public function getSurroundInfo() { return $this->_surroundInfo; }
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/**
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* Returns the preset used in encoding.
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*
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* @return integer
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*/
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public function getPresetUsed() { return $this->_presetUsed; }
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/**
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* Returns the exact length in bytes of the MP3 file originally made by LAME
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* excluded ID3 tag info at the end.
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*
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* The first byte it counts is the first byte of this LAME header and the last
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* byte it counts is the last byte of the last MP3 frame containing music.
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* The value should be equal to file length at the time of LAME encoding,
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* except when using ID3 tags.
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*
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* @return integer
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*/
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public function getMusicLength() { return $this->_musicLength; }
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/**
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* Returns the CRC-16 of the complete MP3 music data as made originally by
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* LAME.
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*
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* @return integer
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*/
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public function getMusicCrc() { return $this->_musicCrc; }
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/**
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* Returns the CRC-16 of the first 190 bytes of the header frame.
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*
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* @return integer
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*/
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public function getCrc() { return $this->_crc; }
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}
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