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doublebuffersdl-mixer.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef BACKENDS_MIXER_DOUBLEBUFFERSDL_H
#define BACKENDS_MIXER_DOUBLEBUFFERSDL_H

#include "backends/mixer/sdl/sdl-mixer.h"

/**
 * SDL mixer manager with double buffering support.
 */
00034 class DoubleBufferSDLMixerManager : public SdlMixerManager {
public:
      DoubleBufferSDLMixerManager();
      virtual ~DoubleBufferSDLMixerManager();

protected:
      SDL_mutex *_soundMutex;
      SDL_cond *_soundCond;
      SDL_Thread *_soundThread;
      bool _soundThreadIsRunning;
      bool _soundThreadShouldQuit;

      byte _activeSoundBuf;
      uint _soundBufSize;
      byte *_soundBuffers[2];

      /**
       * Handles and swap the sound buffers
       */
      void mixerProducerThread();

      /**
       * Finish the mixer manager
       */
      void deinitThreadedMixer();

      /**
       * Callback entry point for the sound thread
       */
      static int SDLCALL mixerProducerThreadEntry(void *arg);

      virtual void startAudio();
      virtual void callbackHandler(byte *samples, int len);
};

#endif

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