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engines/awe/sfx_player.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 AWE_SFX_PLAYER_H
+#define AWE_SFX_PLAYER_H
+
+#include "awe/intern.h"
+
+namespace Awe {
+
+struct SfxInstrument {
+	uint8 *data = nullptr;
+	uint16 volume = 0;
+
+	void clear();
+};
+
+struct SfxModule {
+	const uint8 *data = nullptr;
+	uint16 curPos = 0;
+	uint8 curOrder = 0;
+	uint8 numOrder = 0;
+	uint8 *orderTable = nullptr;
+	SfxInstrument samples[15];
+
+	void clear();
+	void clearSamples();
+};
+
+struct SfxPattern {
+	uint16 note_1 = 0;
+	uint16 note_2 = 0;
+	uint16 sampleStart = 0;
+	uint8 *sampleBuffer = nullptr;
+	uint16 sampleLen = 0;
+	uint16 loopPos = 0;
+	uint16 loopLen = 0;
+	uint16 sampleVolume = 0;
+};
+
+struct SfxChannel {
+	uint8 *sampleData = nullptr;
+	uint16 sampleLen = 0;
+	uint16 sampleLoopPos = 0;
+	uint16 sampleLoopLen = 0;
+	uint16 volume = 0;
+	Frac pos;
+};
+
+struct Resource;
+
+struct SfxPlayer {
+	enum {
+		NUM_CHANNELS = 4
+	};
+
+	Resource *_res;
+
+	uint16 _delay = 0;
+	uint16 _resNum = 0;
+	SfxModule _sfxMod;
+	int16 *_syncVar = nullptr;
+	bool _playing = false;
+	int _rate = 0;
+	int _samplesLeft = 0;
+	SfxChannel _channels[NUM_CHANNELS];
+
+	SfxPlayer(Resource *res);
+
+	void setEventsDelay(uint16 delay);
+	void loadSfxModule(uint16 resNum, uint16 delay, uint8 pos);
+	void prepareInstruments(const uint8 *p);
+	void play(int rate);
+	void mixSamples(int16 *buf, int len);
+	void readSamples(int16 *buf, int len);
+	void start();
+	void stop();
+	void handleEvents();
+	void handlePattern(uint8 channel, const uint8 *patternData);
+};
+
+} // namespace Awe
+
+#endif