1 /* ScummVM - Graphic Adventure Engine
2  *
3  * ScummVM is the legal property of its developers, whose names
4  * are too numerous to list here. Please refer to the COPYRIGHT
5  * file distributed with this source distribution.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20  *
21  */
22 
23 #ifndef SCUMM_PLAYERS_PLAYER_NES_H
24 #define SCUMM_PLAYERS_PLAYER_NES_H
25 
26 #include "common/scummsys.h"
27 #include "scumm/music.h"
28 #include "audio/audiostream.h"
29 #include "audio/mixer.h"
30 
31 namespace Scumm {
32 
33 class ScummEngine;
34 namespace APUe {
35 class APU;
36 }
37 
38 static const int MAXVOLUME = 0x7F;
39 static const int NUMSLOTS = 3;
40 static const int NUMCHANS = 4;
41 
42 /**
43  * Scumm NES sound/music driver.
44  */
45 class Player_NES : public Audio::AudioStream, public MusicEngine {
46 public:
47 	Player_NES(ScummEngine *scumm, Audio::Mixer *mixer);
48 	~Player_NES() override;
49 
50 	void setMusicVolume(int vol) override;
51 	void startSound(int sound) override;
52 	void stopSound(int sound) override;
53 	void stopAllSounds() override;
54 	int  getSoundStatus(int sound) const override;
55 
56 	// AudioStream API
57 	int readBuffer(int16 *buffer, const int numSamples) override;
isStereo()58 	bool isStereo() const override { return false; }
endOfData()59 	bool endOfData() const override { return false; }
getRate()60 	int getRate() const override { return _sampleRate; }
61 
62 private:
63 
64 	void sound_play();
65 	void playSFX(int nr);
66 	void playMusic();
67 	byte fetchSoundByte(int nr);
68 	void chainCommand(int chan);
69 	void checkSilenceChannels(int chan);
70 
71 	void APU_writeChannel(int chan, int offset, byte value);
72 	void APU_writeControl(byte value);
73 	byte APU_readStatus();
74 
75 	ScummEngine *_vm;
76 	Audio::Mixer *_mixer;
77 	Audio::SoundHandle _soundHandle;
78 	APUe::APU *_apu;
79 	int _sampleRate;
80 	int _samples_per_frame;
81 	int _current_sample;
82 	int _maxvol;
83 
84 	struct slot {
85 		int framesleft;
86 		int id;
87 		int type;
88 		byte *data;
89 		int offset;
90 	} _slot[NUMSLOTS];
91 
92 	struct mchan {
93 		int command;
94 		int framedelay;
95 		int pitch;
96 		int volume;
97 		int voldelta;
98 		int envflags;
99 		int cmdlock;
100 	} _mchan[NUMCHANS];
101 
102 	bool isSFXplaying, wasSFXplaying;
103 
104 	byte *dataStart;
105 	int numNotes;
106 	byte *auxData1;
107 	byte *auxData2;
108 
109 	byte *soundptr;
110 };
111 
112 } // End of namespace Scumm
113 
114 #endif
115