/* 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_SDL_SUBSYS_AUDIO_H
#define BACKENDS_SDL_SUBSYS_AUDIO_H

#include "backends/base-subsys-audio.h"

#if defined(__SYMBIAN32__)
#include <esdl\SDL.h>
#else
#include <SDL.h>
#endif

#if defined(MACOSX)
// On Mac OS X, we need to double buffer the audio buffer, else anything
// which produces sampled data with high latency (like the MT-32 emulator)
// will sound terribly.
// This could be enabled for more / most ports in the future, but needs some
// testing.
#define MIXER_DOUBLE_BUFFERING 1
#endif

namespace Audio {
	class MixerImpl;
}

class SdlSubSys_Audio : public BaseSubSys_Audio {
public:
	SdlSubSys_Audio();
	~SdlSubSys_Audio();

	virtual void audioInit();
	virtual void audioDone();

	bool hasFeature(Feature f);
	void setFeatureState(Feature f, bool enable);
	bool getFeatureState(Feature f);

	// Set function that generates samples
	virtual void setupMixer();
	static void mixCallback(void *s, byte *samples, int len);

	virtual void closeMixer();

	virtual Audio::Mixer *getMixer();

	virtual bool openCD(int drive);

	// Poll CD status
	// Returns true if cd audio is playing
	bool pollCD();

	// Play CD audio track
	void playCD(int track, int num_loops, int start_frame, int duration);

	// Stop CD audio track
	void stopCD();

	// Update CD audio status
	void updateCD();

protected:
	bool _inited;

	SDL_AudioSpec _obtainedRate;

	// CD Audio
	SDL_CD *_cdrom;
	int _cdTrack, _cdNumLoops, _cdStartFrame, _cdDuration;
	uint32 _cdEndTime, _cdStopTime;

#ifdef MIXER_DOUBLE_BUFFERING
	SDL_mutex *_soundMutex;
	SDL_cond *_soundCond;
	SDL_Thread *_soundThread;
	bool _soundThreadIsRunning;
	bool _soundThreadShouldQuit;

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

	void mixerProducerThread();
	static int SDLCALL mixerProducerThreadEntry(void *arg);
	void initThreadedMixer(Audio::MixerImpl *mixer, uint bufSize);
	void deinitThreadedMixer();
#endif

	Audio::MixerImpl *_mixer;
};


#endif