File indexing completed on 2025-01-05 04:26:20

 /****************************************************************************************
  * Copyright (c) 2010 Téo Mrnjavac <teo@kde.org>                                        *
  *                                                                                      *
  * This program is free software; you can redistribute it and/or modify it under        *
  * the terms of the GNU General Public License as published by the Free Software        *
  * Foundation; either version 2 of the License, or (at your option) any later           *
  * version.                                                                             *
  *                                                                                      *
  * This program is distributed in the hope that it will be useful, but WITHOUT ANY      *
  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A      *
  * PARTICULAR PURPOSE. See the GNU General Public License for more details.             *
  *                                                                                      *
  * You should have received a copy of the GNU General Public License along with         *
  * this program.  If not, see <http://www.gnu.org/licenses/>.                           *
  ****************************************************************************************/
 
 #include "TranscodingMp3Format.h"
 
 #include <KLocalizedString>
 
 using namespace Transcoding;
 
 Mp3Format::Mp3Format()
 {
     m_encoder = MP3;
     m_fileExtension = QStringLiteral("mp3");
     const QString description1 =
         i18n( "The bitrate is a measure of the quantity of data used to represent a "
         "second of the audio track.<br>The <b>MP3</b> encoder used by Amarok supports "
         "a <a href=http://en.wikipedia.org/wiki/MP3#VBR>variable bitrate (VBR)</a> "
         "setting, which means that the bitrate value fluctuates along the track "
         "based on the complexity of the audio content. More complex intervals of "
         "data are encoded with a higher bitrate than less complex ones; this "
         "approach yields overall better quality and a smaller file than having a "
         "constant bitrate throughout the track.<br>"
         "For this reason, the bitrate measure in this slider is just an estimate "
         "of the average bitrate of the encoded track.<br>"
         "<b>160kb/s</b> is a good choice for music listening on a portable player.<br/>"
         "Anything below <b>120kb/s</b> might be unsatisfactory for music and anything above "
         "<b>205kb/s</b> is probably overkill.");
     QStringList valueLabels;
     QByteArray vbr = "VBR ~%1kb/s";
     valueLabels
         << i18n( vbr, 80 )
         << i18n( vbr, 100 )
         << i18n( vbr, 120 )
         << i18n( vbr, 140 )
         << i18n( vbr, 160 )
         << i18n( vbr, 175 )
         << i18n( vbr, 190 )
         << i18n( vbr, 205 )
         << i18n( vbr, 220 )
         << i18n( vbr, 240 );
 
     m_propertyList << Property::Tradeoff( "quality", i18n( "Expected average bitrate for variable bitrate encoding" ), description1,
                                           i18n( "Smaller file" ), i18n( "Better sound quality" ),
                                           valueLabels, 5 );
 }
 
 QString
 Mp3Format::prettyName() const
 {
     return i18n( "MP3" );
 }
 
 QString
 Mp3Format::description() const
 {
     return i18nc( "Feel free to redirect the english Wikipedia link to a local version, if "
                   "it exists.",
                   "<a href=http://en.wikipedia.org/wiki/MP3>MPEG Audio Layer 3</a> (MP3) is "
                   "a patented digital audio codec using a form of lossy data compression."
                   "<br>In spite of its shortcomings, it is a common format for consumer "
                   "audio storage, and is widely supported on portable music players." );
 }
 
 QIcon
 Mp3Format::icon() const
 {
     return QIcon::fromTheme( QStringLiteral("audio-x-generic") );  //TODO: get a *real* icon!
 }
 
 QStringList
 Mp3Format::ffmpegParameters( const Configuration &configuration ) const
 {
     QStringList parameters;
     parameters << QStringLiteral("-acodec") << QStringLiteral("libmp3lame");
     foreach( const Property &property, m_propertyList )
     {
         if( !configuration.property( property.name() ).isNull()
             && configuration.property( property.name() ).type() == property.variantType() )
         {
             if( property.name() == "quality" )
             {
                 int ffmpegQuality = qAbs( configuration.property( "quality" ).toInt() - 9 );
                 parameters << QStringLiteral("-aq") << QString::number( ffmpegQuality );
             }
         }
     }
     parameters << QStringLiteral("-vcodec") << QStringLiteral("copy"); // keep album art unchanged
     return parameters;
 }
 
 bool
 Mp3Format::verifyAvailability( const QString &ffmpegOutput ) const
 {
     return ffmpegOutput.contains( QRegExp( QStringLiteral("^ .EA... mp3 +.*libmp3lame") ) );
 }