modules/gui/skins2/vars/equalizer.cpp

   1 /*****************************************************************************
   2  * equalizer.cpp
   3  *****************************************************************************
   4  * Copyright (C) 2003 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Cyril Deguet     <asmax@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <vlc_common.h>
  29 #include <vlc_playlist.h>
  30 #include <vlc_input.h>
  31 #include <vlc_aout.h>
  32 #include "equalizer.hpp"
  33 #include "../utils/var_percent.hpp"
  34 #include <ios>
  35 #include <iomanip>
  36 #include <sstream>
  37
  38 EqualizerBands::EqualizerBands( intf_thread_t *pIntf ): SkinObject( pIntf ),
  39     m_isUpdating( false )
  40 {
  41     for( int i = 0; i < kNbBands; i++ )
  42     {
  43         // Create and observe the band variables
  44         VarPercent *pVar = new VarPercent( pIntf );
  45         m_cBands[i] = VariablePtr( pVar );
  46         pVar->set( 0.5f );
  47         pVar->addObserver( this );
  48     }
  49 }
  50
  51
  52 EqualizerBands::~EqualizerBands()
  53 {
  54     for( int i = 0; i < kNbBands; i++ )
  55     {
  56         ((VarPercent*)m_cBands[i].get())->delObserver( this );
  57     }
  58 }
  59
  60
  61 void EqualizerBands::set( string bands )
  62 {
  63     float val;
  64     stringstream ss( bands );
  65
  66     m_isUpdating = true;
  67     // Parse the string
  68     for( int i = 0; i < kNbBands; i++ )
  69     {
  70         ss >> val;
  71         // Set the band value in percent
  72         ((VarPercent*)m_cBands[i].get())->set( (val + 20) / 40 );
  73     }
  74     m_isUpdating = false;
  75 }
  76
  77
  78 VariablePtr EqualizerBands::getBand( int band )
  79 {
  80     return m_cBands[band];
  81 }
  82
  83
  84 void EqualizerBands::onUpdate( Subject<VarPercent> &rBand, void *arg )
  85 {
  86     (void)rBand; (void)arg;
  87     aout_instance_t *pAout = NULL;
  88
  89     playlist_t *pPlaylist = getIntf()->p_sys->p_playlist;
  90     input_thread_t *pInput = playlist_CurrentInput( pPlaylist );
  91     if( pInput )
  92         pAout = input_GetAout( pInput );
  93
  94     // Make sure we are not called from set()
  95     if (!m_isUpdating)
  96     {
  97         float val;
  98         stringstream ss;
  99         // Write one digit after the floating point
 100         ss << setprecision( 1 ) << setiosflags( ios::fixed );
 101
 102         // Convert the band values to a string
 103         val = 40 * ((VarPercent*)m_cBands[0].get())->get() - 20;
 104         ss << val;
 105         for( int i = 1; i < kNbBands; i++ )
 106         {
 107             val = 40 * ((VarPercent*)m_cBands[i].get())->get() - 20;
 108             ss << " " << val;
 109         }
 110
 111         string bands = ss.str();
 112
 113         config_PutPsz( getIntf(), "equalizer-bands", bands.c_str() );
 114         if( pAout )
 115         {
 116             // Update the audio output
 117             var_SetString( pAout, "equalizer-bands", (char*)bands.c_str() );
 118         }
 119     }
 120
 121     if( pAout )
 122         vlc_object_release( pAout );
 123     if( pInput )
 124         vlc_object_release( pInput );
 125 }
 126
 127
 128 EqualizerPreamp::EqualizerPreamp( intf_thread_t *pIntf ): VarPercent( pIntf )
 129 {
 130     // Initial value
 131     VarPercent::set( 0.8 );
 132 }
 133
 134
 135 void EqualizerPreamp::set( float percentage, bool updateVLC )
 136 {
 137     aout_instance_t *pAout = NULL;
 138
 139     playlist_t *pPlaylist = getIntf()->p_sys->p_playlist;
 140     input_thread_t *pInput = playlist_CurrentInput( pPlaylist );
 141     if( pInput )
 142         pAout = input_GetAout( pInput );
 143
 144     VarPercent::set( percentage );
 145
 146     // Avoid infinite loop
 147     if( updateVLC )
 148     {
 149         float val = 40 * percentage - 20;
 150
 151         config_PutFloat( getIntf(), "equalizer-preamp", val );
 152         if( pAout )
 153         {
 154             // Update the audio output
 155             var_SetFloat( pAout, "equalizer-preamp", val );
 156         }
 157     }
 158
 159     if( pAout )
 160         vlc_object_release( pAout );
 161     if( pInput )
 162         vlc_object_release( pInput );
 163 }