Initial commit

backends/mixer/maxmod/maxmod-mixer.cpp

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+// Allow use of stuff in <nds.h>
+#define FORBIDDEN_SYMBOL_EXCEPTION_printf
+#define FORBIDDEN_SYMBOL_EXCEPTION_unistd_h
+
+#include "common/scummsys.h"
+
+#if defined(__DS__)
+
+#include "backends/mixer/maxmod/maxmod-mixer.h"
+#include "common/system.h"
+
+#include <nds.h>
+#include <maxmod9.h>
+
+MaxModMixerManager::MaxModMixerManager(int freq, int bufSize)
+	:
+	_freq(freq),
+	_bufSize(bufSize) {
+
+}
+
+MaxModMixerManager::~MaxModMixerManager() {
+	// HACK: This is called during the OSystem destructor, but Audio::MixerImpl calls
+	// mutex functions from OSystem during its destructor, which causes a crash.
+	// _mixer->setReady(false);
+	_mixer = 0;
+	mmStreamClose();
+}
+
+mm_word on_stream_request( mm_word length, mm_addr dest, mm_stream_formats format ) {
+	Audio::MixerImpl *mixer = (Audio::MixerImpl *)g_system->getMixer();
+	assert(mixer);
+	mixer->mixCallback((byte *)dest, length * 4);
+	return length;
+}
+
+void MaxModMixerManager::init() {
+	_mixer = new Audio::MixerImpl(_freq, _bufSize / 4);
+	assert(_mixer);
+
+	mm_ds_system sys;
+	sys.mod_count 			= 0;
+	sys.samp_count			= 0;
+	sys.mem_bank			= 0;
+	mmInit( &sys );
+
+	_stream.sampling_rate = _freq;
+	_stream.buffer_length = _bufSize / 4;
+	_stream.callback = on_stream_request;
+	_stream.format = MM_STREAM_16BIT_STEREO;
+	_stream.thread_stack_size = 0;
+	// Don't create a thread
+	_stream.minus_thread_prio = 1;
+
+	mmStreamOpen( &_stream );
+
+	_mixer->setReady(true);
+}
+
+void MaxModMixerManager::suspendAudio() {
+	mmStreamClose();
+	_audioSuspended = true;
+}
+
+int MaxModMixerManager::resumeAudio() {
+	if (!_audioSuspended)
+		return -2;
+
+	mmStreamOpen( &_stream );
+	_audioSuspended = false;
+	return 0;
+}
+
+void MaxModMixerManager::updateAudio() {
+	if (!_audioSuspended)
+		mmStreamUpdate();
+}
+
+#endif

backends/mixer/maxmod/maxmod-mixer.h

@@ -0,0 +1,64 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef BACKENDS_MIXER_MAXMOD_H
+#define BACKENDS_MIXER_MAXMOD_H
+
+#include "backends/mixer/mixer.h"
+
+#include <mm_types.h>
+
+/**
+ * MaxMod mixer manager. It wraps the actual implementation
+ * of the Audio:Mixer used by the engine, and sets up
+ * MaxMod and the callback for the audio mixer implementation.
+ */
+class MaxModMixerManager : public MixerManager {
+public:
+	MaxModMixerManager(int freq, int bufSize);
+	virtual ~MaxModMixerManager();
+
+	/**
+	 * Initialize and setups the mixer
+	 */
+	virtual void init();
+
+	/**
+	 * Pauses the audio system
+	 */
+	virtual void suspendAudio();
+
+	/**
+	 * Resumes the audio system
+	 */
+	virtual int resumeAudio();
+
+	/**
+	 * Updates the audio system
+	 */
+	void updateAudio();
+
+protected:
+	mm_stream _stream;
+	int _freq, _bufSize;
+};
+
+#endif