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engines/agi/sound_sarien.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 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 AGI_SOUND_SARIEN_H
+#define AGI_SOUND_SARIEN_H
+
+#include "audio/audiostream.h"
+
+namespace Agi {
+
+#define BUFFER_SIZE 410
+
+#define WAVEFORM_SIZE 64
+#define ENV_ATTACK    10000 /**< envelope attack rate */
+#define ENV_DECAY     1000  /**< envelope decay rate */
+#define ENV_SUSTAIN   100   /**< envelope sustain level */
+#define ENV_RELEASE   7500  /**< envelope release rate */
+#define NUM_CHANNELS  7     /**< number of sound channels */
+
+enum AgiSoundFlags {
+	AGI_SOUND_LOOP      = 0x0001,
+	AGI_SOUND_ENVELOPE  = 0x0002
+};
+enum AgiSoundEnv {
+	AGI_SOUND_ENV_ATTACK    = 3,
+	AGI_SOUND_ENV_DECAY     = 2,
+	AGI_SOUND_ENV_SUSTAIN   = 1,
+	AGI_SOUND_ENV_RELEASE   = 0
+};
+
+
+/**
+ * AGI engine sound channel structure.
+ */
+struct ChannelInfo {
+	AgiSoundEmuType type;
+	const uint8 *ptr; // Pointer to the AgiNote data
+	const int16 *ins;
+	int32 size;
+	uint32 phase;
+	uint32 flags;   // ORs values from AgiSoundFlags
+	AgiSoundEnv adsr;
+	int32 timer;
+	uint32 end;
+	uint32 freq;
+	uint32 vol;
+	uint32 env;
+};
+
+class SoundGenSarien : public SoundGen, public Audio::AudioStream {
+public:
+	SoundGenSarien(AgiBase *vm, Audio::Mixer *pMixer);
+	~SoundGenSarien() override;
+
+	void play(int resnum) override;
+	void stop() override;
+
+	// AudioStream API
+	int readBuffer(int16 *buffer, const int numSamples) override;
+
+	bool isStereo() const override {
+		return false;
+	}
+
+	bool endOfData() const override {
+		return false;
+	}
+
+	int getRate() const override {
+		// FIXME: Ideally, we should use _sampleRate.
+		return 22050;
+	}
+
+private:
+	Common::Mutex _mutex;
+
+	ChannelInfo _chn[NUM_CHANNELS];
+	uint8 _env;
+
+	int16 *_sndBuffer;
+	const int16 *_waveform;
+
+	bool _useChorus;
+
+	bool _playing;
+	int _playingSound;
+
+private:
+	void playSound();
+	uint32 mixSound();
+	void fillAudio(int16 *stream, uint len);
+
+	void stopNote(int i);
+	void playNote(int i, int freq, int vol);
+
+};
+
+} // End of namespace Agi
+
+#endif /* AGI_SOUND_SARIEN_H */