1#ifndef GBA_AUDIO_H
  2#define GBA_AUDIO_H
  3
  4#include "circle-buffer.h"
  5
  6#include <pthread.h>
  7#include <stdint.h>
  8
  9struct GBADMA;
 10
 11const unsigned GBA_AUDIO_SAMPLES;
 12
 13struct GBAAudioEnvelope {
 14	union {
 15		struct {
 16			unsigned length : 6;
 17			unsigned duty : 2;
 18			unsigned stepTime : 3;
 19			unsigned direction : 1;
 20			unsigned initialVolume : 4;
 21		};
 22		uint16_t packed;
 23	};
 24	int currentVolume;
 25	int32_t nextStep;
 26};
 27
 28union GBAAudioSquareControl {
 29	struct {
 30		unsigned frequency : 11;
 31		unsigned : 3;
 32		unsigned stop : 1;
 33		unsigned restart : 1;
 34	};
 35	uint16_t packed;
 36};
 37
 38struct GBAAudioChannel1 {
 39	union GBAAudioSquareSweep {
 40		struct {
 41			unsigned shift : 3;
 42			unsigned direction : 1;
 43			unsigned time : 3;
 44			unsigned : 9;
 45		};
 46		uint16_t packed;
 47	} sweep;
 48
 49	struct GBAAudioEnvelope envelope;
 50	union GBAAudioSquareControl control;
 51};
 52
 53struct GBAAudioChannel2 {
 54	struct GBAAudioEnvelope envelope;
 55	union GBAAudioSquareControl control;
 56};
 57
 58struct GBAAudioChannel3 {
 59	union {
 60		struct {
 61			unsigned : 5;
 62			unsigned size : 1;
 63			unsigned bank : 1;
 64			unsigned disable : 1;
 65			unsigned : 7;
 66		};
 67		uint16_t packed;
 68	} bank;
 69
 70	union {
 71		struct {
 72			unsigned length : 8;
 73			unsigned : 5;
 74			unsigned volume : 3;
 75			unsigned disable : 1;
 76			unsigned : 7;
 77		};
 78		uint16_t packed;
 79	} wave;
 80
 81	union {
 82		struct {
 83			unsigned rate : 11;
 84			unsigned : 3;
 85			unsigned stop : 1;
 86			unsigned restart : 1;
 87		};
 88		uint16_t packed;
 89	} control;
 90};
 91
 92struct GBAAudioChannel4 {
 93	struct GBAAudioEnvelope envelope;
 94	union {
 95		struct {
 96			unsigned ratio : 3;
 97			unsigned power : 1;
 98			unsigned frequency : 4;
 99			unsigned : 6;
100			unsigned stop : 1;
101			unsigned restart : 1;
102		};
103		uint16_t packed;
104	} control;
105
106	unsigned lfsr;
107	int8_t sample;
108};
109
110struct GBAAudioFIFO {
111	struct CircleBuffer fifo;
112	int dmaSource;
113	int8_t sample;
114};
115
116struct GBAAudio {
117	struct GBA* p;
118
119	struct GBAAudioChannel1 ch1;
120	struct GBAAudioChannel2 ch2;
121	struct GBAAudioChannel3 ch3;
122	struct GBAAudioChannel4 ch4;
123
124	struct GBAAudioFIFO chA;
125	struct GBAAudioFIFO chB;
126
127	struct CircleBuffer left;
128	struct CircleBuffer right;
129
130	union {
131		struct {
132			unsigned volumeRight : 3;
133			unsigned : 1;
134			unsigned volumeLeft : 3;
135			unsigned : 1;
136			unsigned ch1Right : 1;
137			unsigned ch2Right : 1;
138			unsigned ch3Right : 1;
139			unsigned ch4Right : 1;
140			unsigned ch1Left : 1;
141			unsigned ch2Left : 1;
142			unsigned ch3Left : 1;
143			unsigned ch4Left : 1;
144		};
145		uint16_t soundcntLo;
146	};
147
148	union {
149		struct {
150			unsigned volume : 2;
151			unsigned volumeChA : 1;
152			unsigned volumeChB : 1;
153			unsigned : 4;
154			unsigned chARight : 1;
155			unsigned chALeft : 1;
156			unsigned chATimer : 1;
157			unsigned chAReset : 1;
158			unsigned chBRight : 1;
159			unsigned chBLeft : 1;
160			unsigned chBTimer : 1;
161			unsigned chBReset : 1;
162		};
163		uint16_t soundcntHi;
164	};
165
166	union {
167		struct {
168			unsigned playingCh1 : 1;
169			unsigned playingCh2 : 1;
170			unsigned playingCh3 : 1;
171			unsigned playingCh4 : 1;
172			unsigned : 3;
173			unsigned enable : 1;
174			unsigned : 8;
175		};
176		uint16_t soundcntX;
177	};
178
179	unsigned sampleRate;
180
181	int32_t nextEvent;
182	int32_t eventDiff;
183	int32_t nextCh1;
184	int32_t nextCh2;
185	int32_t nextCh3;
186	int32_t nextCh4;
187	int32_t nextSample;
188
189	int32_t sampleInterval;
190
191	pthread_mutex_t bufferMutex;
192};
193
194void GBAAudioInit(struct GBAAudio* audio);
195void GBAAudioDeinit(struct GBAAudio* audio);
196
197int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles);
198void GBAAudioScheduleFifoDma(struct GBAAudio* audio, int number, struct GBADMA* info);
199
200void GBAAudioWriteSOUND1CNT_LO(struct GBAAudio* audio, uint16_t value);
201void GBAAudioWriteSOUND1CNT_HI(struct GBAAudio* audio, uint16_t value);
202void GBAAudioWriteSOUND1CNT_X(struct GBAAudio* audio, uint16_t value);
203void GBAAudioWriteSOUND2CNT_LO(struct GBAAudio* audio, uint16_t value);
204void GBAAudioWriteSOUND2CNT_HI(struct GBAAudio* audio, uint16_t value);
205void GBAAudioWriteSOUND3CNT_LO(struct GBAAudio* audio, uint16_t value);
206void GBAAudioWriteSOUND3CNT_HI(struct GBAAudio* audio, uint16_t value);
207void GBAAudioWriteSOUND3CNT_X(struct GBAAudio* audio, uint16_t value);
208void GBAAudioWriteSOUND4CNT_LO(struct GBAAudio* audio, uint16_t value);
209void GBAAudioWriteSOUND4CNT_HI(struct GBAAudio* audio, uint16_t value);
210void GBAAudioWriteSOUNDCNT_LO(struct GBAAudio* audio, uint16_t value);
211void GBAAudioWriteSOUNDCNT_HI(struct GBAAudio* audio, uint16_t value);
212void GBAAudioWriteSOUNDCNT_X(struct GBAAudio* audio, uint16_t value);
213
214void GBAAudioWriteWaveRAM(struct GBAAudio* audio, int address, uint32_t value);
215void GBAAudioWriteFIFO(struct GBAAudio* audio, int address, uint32_t value);
216void GBAAudioSampleFIFO(struct GBAAudio* audio, int fifoId);
217
218#endif