PS3: Add a SDL 1.3 mixer, for use with the PS3 backend.

SDL 1.3 allows converting from the S16SYS sound format to F32MSB, which is required by the PS3.

backends/mixer/sdl13/sdl13-mixer.cpp

@@ -0,0 +1,109 @@
+/* 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.
+ *
+ */
+
+#include "common/scummsys.h"
+
+#if defined(SDL_BACKEND)
+
+#include "backends/mixer/sdl13/sdl13-mixer.h"
+#include "common/debug.h"
+#include "common/system.h"
+#include "common/config-manager.h"
+#include "common/textconsole.h"
+
+#ifdef GP2X
+#define SAMPLES_PER_SEC 11025
+#else
+#define SAMPLES_PER_SEC 22050
+#endif
+//#define SAMPLES_PER_SEC 44100
+
+Sdl13MixerManager::Sdl13MixerManager()
+	:
+	SdlMixerManager(),
+	_device(0) {
+
+}
+
+Sdl13MixerManager::~Sdl13MixerManager() {
+	_mixer->setReady(false);
+
+	SDL_CloseAudioDevice(_device);
+
+	delete _mixer;
+}
+
+void Sdl13MixerManager::init() {
+	// Start SDL Audio subsystem
+	if (SDL_InitSubSystem(SDL_INIT_AUDIO) == -1) {
+		error("Could not initialize SDL: %s", SDL_GetError());
+	}
+
+	// Get the desired audio specs
+	SDL_AudioSpec desired = getAudioSpec(SAMPLES_PER_SEC);
+
+	// Start SDL audio with the desired specs
+	_device = SDL_OpenAudioDevice(NULL, 0, &desired, &_obtained,
+			SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
+
+	if (_device <= 0) {
+		warning("Could not open audio device: %s", SDL_GetError());
+
+		_mixer = new Audio::MixerImpl(g_system, desired.freq);
+		assert(_mixer); 
+		_mixer->setReady(false);
+	} else {
+		debug(1, "Output sample rate: %d Hz", _obtained.freq);
+
+		_mixer = new Audio::MixerImpl(g_system, _obtained.freq);
+		assert(_mixer); 
+		_mixer->setReady(true);
+
+		startAudio();
+	}
+}
+
+void Sdl13MixerManager::startAudio() {
+	// Start the sound system
+	SDL_PauseAudioDevice(_device, 0);
+}
+
+void Sdl13MixerManager::suspendAudio() {
+	SDL_CloseAudioDevice(_device);
+	_audioSuspended = true;
+}
+
+int Sdl13MixerManager::resumeAudio() {
+	if (!_audioSuspended)
+		return -2;
+
+	_device = SDL_OpenAudioDevice(NULL, 0, &_obtained, NULL, 0);
+	if (_device <= 0) {
+		return -1;
+	}
+
+	SDL_PauseAudioDevice(_device, 0);
+	_audioSuspended = false;
+	return 0;
+}
+
+#endif

backends/mixer/sdl13/sdl13-mixer.h

@@ -0,0 +1,67 @@
+/* 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.
+ *
+ */
+
+#ifndef BACKENDS_MIXER_SDL13_H
+#define BACKENDS_MIXER_SDL13_H
+
+#include "backends/mixer/sdl/sdl-mixer.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.
+ */
+class Sdl13MixerManager : public SdlMixerManager {
+public:
+	Sdl13MixerManager();
+	virtual ~Sdl13MixerManager();
+
+	/**
+	 * Initialize and setups the mixer
+	 */
+	virtual void init();
+
+	/**
+	 * Pauses the audio system
+	 */
+	virtual void suspendAudio();
+
+	/**
+	 * Resumes the audio system
+	 */
+	virtual int resumeAudio();
+
+protected:
+
+	/**
+	 * The opened SDL audio device
+	 */
+	SDL_AudioDeviceID _device;
+
+	/**
+	 * Starts SDL audio
+	 */
+	virtual void startAudio();
+};
+
+#endif

backends/module.mk

@@ -108,7 +108,8 @@ ifdef PLAYSTATION3
 MODULE_OBJS += \
 	fs/posix/posix-fs.o \
 	fs/posix/posix-fs-factory.o \
-	fs/ps3/ps3-fs-factory.o
+	fs/ps3/ps3-fs-factory.o \
+	mixer/sdl13/sdl13-mixer.o
 endif
 
 ifeq ($(BACKEND),ds)

backends/platform/sdl/ps3/ps3.cpp

@@ -30,6 +30,7 @@
 #include "backends/graphics/surfacesdl/surfacesdl-graphics.h"
 #include "backends/saves/default/default-saves.h"
 #include "backends/fs/ps3/ps3-fs-factory.h"
+#include "backends/mixer/sdl13/sdl13-mixer.h"
 
 #include <dirent.h>
 #include <sys/stat.h>
@@ -65,6 +66,14 @@ void OSystem_PS3::initBackend() {
 	if (_savefileManager == 0)
 		_savefileManager = new DefaultSaveFileManager(PREFIX "/saves");
 
+	// Create the mixer manager
+	if (_mixer == 0) {
+		_mixerManager = new Sdl13MixerManager();
+
+		// Setup and start mixer
+		_mixerManager->init();
+	}
+
 	// Invoke parent implementation of this method
 	OSystem_SDL::initBackend();
 }