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engines/scumm/players/player_mod.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 SCUMM_PLAYERS_PLAYER_MOD_H
+#define SCUMM_PLAYERS_PLAYER_MOD_H
+
+#include "scumm/scumm.h"
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+#include "common/mutex.h"
+
+namespace Audio {
+class RateConverter;
+}
+
+namespace Scumm {
+
+/**
+ * Generic Amiga MOD mixer - provides a 60Hz 'update' routine.
+ */
+class Player_MOD : public Audio::AudioStream {
+public:
+	Player_MOD(Audio::Mixer *mixer);
+	~Player_MOD() override;
+	virtual void setMusicVolume(int vol);
+
+	virtual void startChannel(int id, void *data, int size, int rate, uint8 vol, int loopStart = 0, int loopEnd = 0, int8 pan = 0);
+	virtual void stopChannel(int id);
+	virtual void setChannelVol(int id, uint8 vol);
+	virtual void setChannelPan(int id, int8 pan);
+	virtual void setChannelFreq(int id, int freq);
+
+	typedef void ModUpdateProc(void *param);
+
+	virtual void setUpdateProc(ModUpdateProc *proc, void *param, int freq);
+	virtual void clearUpdateProc();
+
+	// AudioStream API
+	int readBuffer(int16 *buffer, const int numSamples) override {
+		Common::StackLock lock(_mutex);
+		do_mix(buffer, numSamples / 2);
+		return numSamples;
+	}
+	bool isStereo() const override { return true; }
+	bool endOfData() const override { return false; }
+	int getRate() const override { return _sampleRate; }
+
+private:
+	enum {
+		MOD_MAXCHANS = 24
+	};
+
+	struct soundChan {
+		int id;
+		uint8 vol;
+		int8 pan;
+		uint16 freq;
+
+		uint32 ctr;
+		int16 pos;
+		Audio::AudioStream *input;
+	};
+
+	Audio::Mixer *_mixer;
+	Audio::SoundHandle _soundHandle;
+	Common::Mutex _mutex;
+
+	uint32 _mixamt;
+	uint32 _mixpos;
+	const int _sampleRate;
+
+	soundChan _channels[MOD_MAXCHANS];
+
+	uint8 _maxvol;
+
+	virtual void do_mix(int16 *buf, uint len);
+
+	ModUpdateProc *_playproc;
+	void *_playparam;
+};
+
+} // End of namespace Scumm
+
+#endif