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sdl-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_SDL_H
#define BACKENDS_MIXER_SDL_H

#include "backends/platform/sdl/sdl-sys.h"
#include "audio/mixer_intern.h"

/**
 * SDL mixer manager. It wraps the actual implementation
 * of the Audio:Mixer used by the engine, and setups
 * the SDL audio subsystem and the callback for the
 * audio mixer implementation.
 */
00038 class SdlMixerManager {
public:
      SdlMixerManager();
      virtual ~SdlMixerManager();

      /**
       * Initialize and setups the mixer
       */
      virtual void init();

      /**
       * Get the audio mixer implementation
       */
00051       Audio::Mixer *getMixer() { return (Audio::Mixer *)_mixer; }

      // Used by LinuxMoto Port

      /**
       * Pauses the audio system
       */
      virtual void suspendAudio();

      /**
       * Resumes the audio system
       */
      virtual int resumeAudio();

protected:
      /** The mixer implementation */
00067       Audio::MixerImpl *_mixer;

      /**
       * The obtained audio specification after opening the
       * audio system.
       */
00073       SDL_AudioSpec _obtainedRate;

      /** State of the audio system */
00076       bool _audioSuspended;

      /**
       * Returns the desired audio specification 
       */
      virtual SDL_AudioSpec getAudioSpec(uint32 rate);

      /**
       * Starts SDL audio
       */
      virtual void startAudio();

      /**
       * Handles the audio callback
       */
      virtual void callbackHandler(byte *samples, int len);

      /**
       * The mixer callback entry point. Static functions can't be overrided
       * by subclasses, so it invokes the non-static function callbackHandler()
       */
      static void sdlCallback(void *this_, byte *samples, int len);
};

#endif

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