src/enginebase.cpp

   1 //Copyright: (C) 2003 Mark Kretschmann
   2 //           (C) 2004,2005 Max Howell, <max.howell@methylblue.com>
   3 //License:   See COPYING
   4
   5 #include "enginebase.h"
   6
   7 #include <cmath>
   8
   9
  10 Engine::Base::Base()
  11         : Amarok::Plugin()
  12         , m_xfadeLength( 0 )
  13         , m_xfadeNextTrack( false )
  14         , m_volume( 50 )
  15         , m_scope( SCOPESIZE )
  16         , m_isStream( false )
  17 {}
  18
  19
  20 Engine::Base::~Base()
  21 {
  22 }
  23
  24 //////////////////////////////////////////////////////////////////////
  25
  26
  27 bool
  28 Engine::Base::load( const KUrl &url, bool stream )
  29 {
  30     m_url = url;
  31     m_isStream = stream;
  32
  33     return true;
  34 }
  35
  36 void
  37 Engine::Base::beginFadeOut()
  38 {
  39     stop();
  40 }
  41
  42 void Engine::Base::setVolume( uint value )
  43 {
  44     m_volume = value;
  45
  46     setVolumeSW( makeVolumeLogarithmic( value ) );
  47 }
  48
  49
  50 uint
  51 Engine::Base::makeVolumeLogarithmic( uint volume ) // static
  52 {
  53     // We're using a logarithmic function to make the volume ramp more natural.
  54     return static_cast<uint>( 100 - 100.0 * std::log10( ( 100 - volume ) * 0.09 + 1.0 ) );
  55 }
  56
  57
  58 #include "enginebase.moc"