1 
2 /*
3  * REminiscence - Flashback interpreter
4  * Copyright (C) 2005-2019 Gregory Montoir (cyx@users.sourceforge.net)
5  */
6 
7 #ifndef MIXER_H__
8 #define MIXER_H__
9 
10 #include "intern.h"
11 #include "cpc_player.h"
12 #include "mod_player.h"
13 #include "ogg_player.h"
14 #include "sfx_player.h"
15 
16 struct MixerChunk {
17 	const uint8_t *data;
18 	uint32_t len;
19 
MixerChunkMixerChunk20 	MixerChunk()
21 		: data(0), len(0) {
22 	}
23 
getPCMMixerChunk24 	int8_t getPCM(int offset) const {
25 		if (offset < 0) {
26 			offset = 0;
27 		} else if (offset >= (int)len) {
28 			offset = len - 1;
29 		}
30 		return (int8_t)data[offset];
31 	}
32 };
33 
34 struct MixerChannel {
35 	uint8_t active;
36 	uint8_t volume;
37 	MixerChunk chunk;
38 	uint32_t chunkPos;
39 	uint32_t chunkInc;
40 };
41 
42 struct FileSystem;
43 struct SystemStub;
44 
45 struct Mixer {
46 	typedef bool (*PremixHook)(void *userData, int16_t *buf, int len);
47 
48 	enum MusicType {
49 		MT_NONE,
50 		MT_MOD,
51 		MT_OGG,
52 		MT_SFX,
53 		MT_CPC,
54 	};
55 
56 	enum {
57 		MUSIC_TRACK = 1000,
58 		NUM_CHANNELS = 4,
59 		FRAC_BITS = 12,
60 		MAX_VOLUME = 64
61 	};
62 
63 	FileSystem *_fs;
64 	SystemStub *_stub;
65 	MixerChannel _channels[NUM_CHANNELS];
66 	PremixHook _premixHook;
67 	void *_premixHookData;
68 	MusicType _backgroundMusicType;
69 	MusicType _musicType;
70 	CpcPlayer _cpc;
71 	ModPlayer _mod;
72 	OggPlayer _ogg;
73 	SfxPlayer _sfx;
74 	int _musicTrack;
75 
76 	Mixer(FileSystem *fs, SystemStub *stub);
77 	void init();
78 	void free();
79 	void setPremixHook(PremixHook premixHook, void *userData);
80 	void play(const uint8_t *data, uint32_t len, uint16_t freq, uint8_t volume);
81 	bool isPlaying(const uint8_t *data) const;
82 	uint32_t getSampleRate() const;
83 	void stopAll();
84 	void playMusic(int num);
85 	void stopMusic();
86 	void mix(int16_t *buf, int len);
87 
88 	static void mixCallback(void *param, int16_t *buf, int len);
89 };
90 
91 #endif // MIXER_H__
92