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engines/agi/sound_pcjr.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_PCJR_H
+#define AGI_SOUND_PCJR_H
+
+#include "audio/audiostream.h"
+
+namespace Agi {
+
+#define CHAN_MAX 4
+
+#define SAMPLE_RATE 22050
+
+enum GenType {
+	kGenSilence,
+	kGenTone,
+	kGenPeriod,
+	kGenWhite
+};
+
+struct SndGenChan {
+	const byte *data;
+	uint16 duration;
+	uint16 avail;   // turned on (1)  but when the channel's data runs out, it's set to (0)
+	uint16 dissolveCount;
+	byte attenuation;
+	byte attenuationCopy;
+
+	GenType genType;
+
+	// for the sample mixer
+	int freqCount;
+};
+
+struct ToneChan {
+	int avail;
+
+	int noteCount; // length of tone.. duration
+
+	int freqCount;
+	int freqCountPrev;
+	int atten;  // volume
+
+	GenType genType;
+	int genTypePrev;
+
+	int count;
+	int scale;
+	int sign;
+	unsigned int noiseState; /* noise generator      */
+	int feedback;            /* noise feedback mask */
+};
+
+class SoundGenPCJr : public SoundGen, public Audio::AudioStream {
+public:
+	SoundGenPCJr(AgiBase *vm, Audio::Mixer *pMixer);
+	~SoundGenPCJr() 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:
+	int getNextNote(int ch);
+	int getNextNote_v2(int ch);
+	int getNextNote_v1(int ch);
+	int volumeCalc(SndGenChan *chan);
+
+	void writeData(uint8 val);
+
+	int chanGen(int chan, int16 *stream, int len);
+
+	int fillNoise(ToneChan *t, int16 *buf, int len);
+	int fillSquare(ToneChan *t, int16 *buf, int len);
+
+private:
+	Common::Mutex _mutex;
+	
+	SndGenChan _channel[CHAN_MAX];
+	ToneChan _tchannel[CHAN_MAX];
+	int16 *_chanData;
+	int _chanAllocated;
+
+	int _dissolveMethod;
+	int32 _periodicNoiseMask;
+
+	uint8 *_v1data;
+	uint32 _v1size;
+	int _v1duration;
+
+	int _reg;
+};
+
+} // End of namespace Agi
+
+#endif /* AGI_SOUND_PCJR_H */