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audio/mods/infogrames.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/>.
+ *
+ */
+
+/**
+ * @file
+ * Sound decoder used in engines:
+ *  - gob
+ */
+
+#ifndef AUDIO_MODS_INFOGRAMES_H
+#define AUDIO_MODS_INFOGRAMES_H
+
+#include "audio/mods/paula.h"
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace Audio {
+
+/** A player for the Infogrames/RobHubbard2 format */
+class Infogrames : public Paula {
+public:
+	class Instruments {
+	public:
+		Instruments();
+		template<typename T> Instruments(T ins) {
+			init();
+			bool result = load(ins);
+			assert(result);
+		}
+		~Instruments();
+
+		bool load(Common::SeekableReadStream &ins);
+		bool load(const char *ins);
+		void unload();
+
+		uint8 getCount() const { return _count; }
+
+	protected:
+		struct Sample {
+			int8 *data;
+			int8 *dataRepeat;
+			uint32 length;
+			uint32 lengthRepeat;
+		} _samples[32];
+
+		uint8 _count;
+		int8 *_sampleData;
+
+		void init();
+
+		friend class Infogrames;
+	};
+
+	Infogrames(Instruments &ins, bool stereo = false, int rate = 44100,
+			int interruptFreq = 0);
+	~Infogrames();
+
+	Instruments *getInstruments() const { return _instruments; }
+	bool getRepeating() const { return _repCount != 0; }
+	void setRepeating (int32 repCount) { _repCount = repCount; }
+
+	bool load(Common::SeekableReadStream &dum);
+	bool load(const char *dum);
+	void unload();
+	void restart() {
+		if (_data) {
+			// Use the mutex here to ensure we do not call init()
+			// while data is being read by the mixer thread.
+			_mutex.lock();
+			init();
+			startPlay();
+			_mutex.unlock();
+		}
+	}
+
+protected:
+	Instruments *_instruments;
+
+	static const uint8 tickCount[];
+	static const uint16 periods[];
+	byte *_data;
+	int32 _repCount;
+
+	byte *_subSong;
+	byte *_cmdBlocks;
+	byte *_volSlideBlocks;
+	byte *_periodSlideBlocks;
+	uint8 _speedCounter;
+	uint8 _speed;
+
+	uint16 _volume;
+	int16 _period;
+	uint8 _sample;
+
+	struct Slide {
+		byte *data;
+		int8 amount;
+		uint8 dataOffset;
+		int16 finetuneNeg;
+		int16 finetunePos;
+		uint8 curDelay1;
+		uint8 curDelay2;
+		uint8 flags; // 0: Apply finetune modifier, 2: Don't slide, 7: Continuous
+	};
+	struct Channel {
+		byte *cmdBlockIndices;
+		byte *cmdBlocks;
+		byte *cmds;
+		uint8 ticks;
+		uint8 tickCount;
+		Slide volSlide;
+		Slide periodSlide;
+		int16 period;
+		int8 periodMod;
+		uint8 flags; // 0: Need init, 5: Loop cmdBlocks, 6: Ignore channel
+	} _chn[4];
+
+	void init();
+	void reset();
+	void getNextSample(Channel &chn);
+	int16 tune(Slide &slide, int16 start) const;
+	virtual void interrupt();
+};
+
+} // End of namespace Audio
+
+#endif