audiomixer.h

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// ##########################################################################
// ####                                                                  ####
// ####                      RTP Audio Server Project                    ####
// ####                    ============================                  ####
// ####                                                                  ####
// #### Audio Mixer                                                      ####
// ####                                                                  ####
// ####           Copyright (C) 1999-2012 by Thomas Dreibholz            ####
// ####                                                                  ####
// #### Contact:                                                         ####
// ####    EMail: dreibh@iem.uni-due.de                                  ####
// ####    WWW:   https://www.nntb.no/~dreibh/rtpaudio                ####
// ####                                                                  ####
// #### ---------------------------------------------------------------- ####
// ####                                                                  ####
// #### 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 3 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/>.                                  ####
// ####                                                                  ####
// ##########################################################################
// $Id: audiomixer.h 1329 2011-12-23 22:06:51Z dreibh $


#ifndef AUDIOMIXER_H
#define AUDIOMIXER_H


#include "tdsystem.h"
#include "audiodevice.h"

#ifdef HAVE_PULSEAUDIO
#include "condition.h"
#include <pulse/volume.h>
#include <pulse/introspect.h>
#define SOUND_MIXER_PCM 0   // Dummy value
#else
#include <sys/soundcard.h>
#endif


class AudioMixer
{
   // ====== Constructor/Destructor =========================================
   public:
   AudioMixer(AudioDevice* audioDevice,
              int          mixerChannel = SOUND_MIXER_PCM,
              const char*  name         = "/dev/mixer");

   ~AudioMixer();


   // ====== Mixer functions ================================================
   inline bool ready() const;

   bool getVolume(card8& left, card8& right);

   bool setVolume(const card8 left, const card8 right);


   // ====== Private data ===================================================
   private:
#ifdef HAVE_PULSEAUDIO
   static void sink_info_cb(pa_context* context, const pa_sink_info* si, int eol, void* userData);

   AudioDevice*   Device;
   pa_channel_map Map;
   pa_cvolume     Volume;
   Condition      VolumeUpdated;
#else
   int            Device;
   int            Channel;
#endif
};


#include "audiomixer.icc"


#endif