1 files changed, 81 insertions, 0 deletions
diff --git a/backends/mixer/sdl/sdl-mixer.h b/backends/mixer/sdl/sdl-mixer.h
new file mode 100644
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+++ b/backends/mixer/sdl/sdl-mixer.h
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+/* 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
+
+#if defined(__SYMBIAN32__)
+#include <esdl\SDL.h>
+#else
+#include <SDL.h>
+#endif
+
+#include "sound/mixer_intern.h"
+
+#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
+
+class SdlMixerImpl : public Audio::MixerImpl {
+public:
+
+	SdlMixerImpl(OSystem *system);
+	~SdlMixerImpl();
+
+protected:
+	SDL_AudioSpec _obtainedRate;
+
+	static void mixSdlCallback(void *s, byte *samples, int len);
+
+#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(uint bufSize);
+	void deinitThreadedMixer();
+
+public:
+	SDL_mutex *getSoundMutex() { return _soundMutex; }
+	SDL_cond *getSoundCond() { return _soundCond; }
+	uint getSoundBufSize() { return _soundBufSize; }
+	byte *getActiveSoundBuf() { return _soundBuffers[_activeSoundBuf]; }
+#endif
+};
+
+#endif