Modularized Symbian port.

svn-id: r50356

2 files changed, 148 insertions, 0 deletions

diff --git a/backends/mixer/symbiansdl/symbiansdl-mixer.cpp b/backends/mixer/symbiansdl/symbiansdl-mixer.cpp
new file mode 100644
index 0000000000..0cbae85cb9
--- /dev/null
+++ b/backends/mixer/symbiansdl/symbiansdl-mixer.cpp
@@ -0,0 +1,102 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifdef __SYMBIAN32__
+
+#include "backends/mixer/symbiansdl/symbiansdl-mixer.h"
+#include "common/system.h"
+
+#ifdef SAMPLES_PER_SEC_8000 // the GreanSymbianMMP format cannot handle values for defines :(
+  #define SAMPLES_PER_SEC 8000
+#else
+  #define SAMPLES_PER_SEC 16000
+#endif
+
+SymbianSdlMixerManager::SymbianSdlMixerManager()
+	:
+	_stereo_mix_buffer(0) {
+
+}
+
+SymbianSdlMixerManager::~SymbianSdlMixerManager() {
+	delete[] _stereo_mix_buffer;
+}
+
+void SymbianSdlMixerManager::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();
+
+	// Start SDL audio with the desired specs
+	if (SDL_OpenAudio(&desired, &_obtainedRate) != 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", _obtainedRate.freq);
+
+		_channels = _obtainedRate.channels;
+
+		// Need to create mixbuffer for stereo mix to downmix
+		if (_channels != 2) {
+			_stereo_mix_buffer = new byte [_obtainedRate.size * 2]; // * 2 for stereo values
+		}
+
+		_mixer = new Audio::MixerImpl(g_system, _obtainedRate.freq);
+		assert(_mixer); 
+		_mixer->setReady(true);
+
+		startAudio();
+	}
+}
+
+void SymbianSdlMixerManager::callbackHandler(byte *samples, int len) {
+#if defined (S60) && !defined(S60V3)
+	// If not stereo then we need to downmix
+	if (_mixer->_channels != 2) {
+		_mixer->mixCallback(_stereo_mix_buffer, len * 2);
+
+		int16 *bitmixDst = (int16 *)samples;
+		int16 *bitmixSrc = (int16 *)_stereo_mix_buffer;
+
+		for (int loop = len / 2; loop >= 0; loop --) {
+			*bitmixDst = (*bitmixSrc + *(bitmixSrc + 1)) >> 1;
+			bitmixDst++;
+			bitmixSrc += 2;
+		}
+	} else
+#else
+	_mixer->mixCallback(samples, len);
+#endif
+}
+
+#endif
+
diff --git a/backends/mixer/symbiansdl/symbiansdl-mixer.h b/backends/mixer/symbiansdl/symbiansdl-mixer.h
new file mode 100644
index 0000000000..e809bd4cd0
--- /dev/null
+++ b/backends/mixer/symbiansdl/symbiansdl-mixer.h
@@ -0,0 +1,46 @@
+/* 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_SYMBIAN_SDL_H
+#define BACKENDS_MIXER_SYMBIAN_SDL_H
+
+#include "backends/mixer/sdl/sdl-mixer.h"
+
+class SymbianSdlMixerManager : public SdlMixerManager {
+public:
+	SymbianSdlMixerManager();
+	~SymbianSdlMixerManager();
+
+	void init();
+
+protected:
+	int _channels;
+	byte *_stereo_mix_buffer;
+
+	void callbackHandler(byte *samples, int len);
+};
+
+#endif
+