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engines/scumm/players/player_nes.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_NES_H
+#define SCUMM_PLAYERS_PLAYER_NES_H
+
+#include "common/scummsys.h"
+#include "scumm/music.h"
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+
+namespace Scumm {
+
+class ScummEngine;
+namespace APUe {
+class APU;
+}
+
+static const int MAXVOLUME = 0x7F;
+static const int NUMSLOTS = 3;
+static const int NUMCHANS = 4;
+
+/**
+ * Scumm NES sound/music driver.
+ */
+class Player_NES : public Audio::AudioStream, public MusicEngine {
+public:
+	Player_NES(ScummEngine *scumm, Audio::Mixer *mixer);
+	~Player_NES() override;
+
+	void setMusicVolume(int vol) override;
+	void startSound(int sound) override;
+	void stopSound(int sound) override;
+	void stopAllSounds() override;
+	int  getSoundStatus(int sound) const 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 { return _sampleRate; }
+
+private:
+
+	void sound_play();
+	void playSFX(int nr);
+	void playMusic();
+	void chainCommand(int chan);
+	void checkSilenceChannels(int chan);
+
+	void APU_writeChannel(int chan, int offset, byte value);
+	void APU_writeControl(byte value);
+	byte APU_readStatus();
+
+	ScummEngine *_vm;
+	Audio::Mixer *_mixer;
+	Audio::SoundHandle _soundHandle;
+	APUe::APU *_apu;
+	int _sampleRate;
+	int _samples_per_frame;
+	int _current_sample;
+	int _maxvol;
+
+	struct slot {
+		int framesleft;
+		int id;
+		int type;
+		byte *data;
+		int offset;
+	} _slot[NUMSLOTS];
+
+	struct mchan {
+		int command;
+		int framedelay;
+		int pitch;
+		int volume;
+		int voldelta;
+		int envflags;
+		int cmdlock;
+	} _mchan[NUMCHANS];
+
+	bool isSFXplaying, wasSFXplaying;
+
+	int numNotes;
+	byte *auxData1;
+	byte *auxData2;
+};
+
+} // End of namespace Scumm
+
+#endif