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	int dead;
 26	int32_t nextStep;
 27};
 28
 29struct GBAAudioSquareControl {
 30	union {
 31		struct {
 32			unsigned frequency : 11;
 33			unsigned : 3;
 34			unsigned stop : 1;
 35			unsigned restart : 1;
 36		};
 37		uint16_t packed;
 38	};
 39	int hi;
 40	int32_t nextStep;
 41	int32_t endTime;
 42};
 43
 44struct GBAAudioChannel1 {
 45	union GBAAudioSquareSweep {
 46		struct {
 47			unsigned shift : 3;
 48			unsigned direction : 1;
 49			unsigned time : 3;
 50			unsigned : 9;
 51		};
 52		uint16_t packed;
 53	} sweep;
 54	int32_t nextSweep;
 55
 56	struct GBAAudioEnvelope envelope;
 57	struct GBAAudioSquareControl control;
 58	int8_t sample;
 59};
 60
 61struct GBAAudioChannel2 {
 62	struct GBAAudioEnvelope envelope;
 63	struct GBAAudioSquareControl control;
 64	int8_t sample;
 65};
 66
 67struct GBAAudioChannel3 {
 68	union {
 69		struct {
 70			unsigned : 5;
 71			unsigned size : 1;
 72			unsigned bank : 1;
 73			unsigned enable : 1;
 74			unsigned : 7;
 75		};
 76		uint16_t packed;
 77	} bank;
 78
 79	union {
 80		struct {
 81			unsigned length : 8;
 82			unsigned : 5;
 83			unsigned volume : 3;
 84		};
 85		uint16_t packed;
 86	} wave;
 87
 88	struct {
 89		union {
 90			struct {
 91				unsigned rate : 11;
 92				unsigned : 3;
 93				unsigned stop : 1;
 94				unsigned restart : 1;
 95			};
 96			uint16_t packed;
 97		};
 98		int32_t endTime;
 99	} control;
100
101	uint32_t wavedata[8];
102	int8_t sample;
103};
104
105struct GBAAudioChannel4 {
106	struct GBAAudioEnvelope envelope;
107	struct {
108		union {
109			struct {
110				unsigned ratio : 3;
111				unsigned power : 1;
112				unsigned frequency : 4;
113				unsigned : 6;
114				unsigned stop : 1;
115				unsigned restart : 1;
116			};
117			uint16_t packed;
118		};
119		int32_t endTime;
120	} control;
121
122	unsigned lfsr;
123	int8_t sample;
124};
125
126struct GBAAudioFIFO {
127	struct CircleBuffer fifo;
128	int dmaSource;
129	int8_t sample;
130};
131
132struct GBAAudio {
133	struct GBA* p;
134
135	struct GBAAudioChannel1 ch1;
136	struct GBAAudioChannel2 ch2;
137	struct GBAAudioChannel3 ch3;
138	struct GBAAudioChannel4 ch4;
139
140	struct GBAAudioFIFO chA;
141	struct GBAAudioFIFO chB;
142
143	struct CircleBuffer left;
144	struct CircleBuffer right;
145
146	union {
147		struct {
148			unsigned volumeRight : 3;
149			unsigned : 1;
150			unsigned volumeLeft : 3;
151			unsigned : 1;
152			unsigned ch1Right : 1;
153			unsigned ch2Right : 1;
154			unsigned ch3Right : 1;
155			unsigned ch4Right : 1;
156			unsigned ch1Left : 1;
157			unsigned ch2Left : 1;
158			unsigned ch3Left : 1;
159			unsigned ch4Left : 1;
160		};
161		uint16_t soundcntLo;
162	};
163
164	union {
165		struct {
166			unsigned volume : 2;
167			unsigned volumeChA : 1;
168			unsigned volumeChB : 1;
169			unsigned : 4;
170			unsigned chARight : 1;
171			unsigned chALeft : 1;
172			unsigned chATimer : 1;
173			unsigned chAReset : 1;
174			unsigned chBRight : 1;
175			unsigned chBLeft : 1;
176			unsigned chBTimer : 1;
177			unsigned chBReset : 1;
178		};
179		uint16_t soundcntHi;
180	};
181
182	union {
183		struct {
184			unsigned playingCh1 : 1;
185			unsigned playingCh2 : 1;
186			unsigned playingCh3 : 1;
187			unsigned playingCh4 : 1;
188			unsigned : 3;
189			unsigned enable : 1;
190			unsigned : 8;
191		};
192		uint16_t soundcntX;
193	};
194
195	unsigned sampleRate;
196
197	int32_t nextEvent;
198	int32_t eventDiff;
199	int32_t nextCh1;
200	int32_t nextCh2;
201	int32_t nextCh3;
202	int32_t nextCh4;
203	int32_t nextSample;
204
205	int32_t sampleInterval;
206
207	pthread_mutex_t bufferMutex;
208};
209
210void GBAAudioInit(struct GBAAudio* audio);
211void GBAAudioDeinit(struct GBAAudio* audio);
212
213int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles);
214void GBAAudioScheduleFifoDma(struct GBAAudio* audio, int number, struct GBADMA* info);
215
216void GBAAudioWriteSOUND1CNT_LO(struct GBAAudio* audio, uint16_t value);
217void GBAAudioWriteSOUND1CNT_HI(struct GBAAudio* audio, uint16_t value);
218void GBAAudioWriteSOUND1CNT_X(struct GBAAudio* audio, uint16_t value);
219void GBAAudioWriteSOUND2CNT_LO(struct GBAAudio* audio, uint16_t value);
220void GBAAudioWriteSOUND2CNT_HI(struct GBAAudio* audio, uint16_t value);
221void GBAAudioWriteSOUND3CNT_LO(struct GBAAudio* audio, uint16_t value);
222void GBAAudioWriteSOUND3CNT_HI(struct GBAAudio* audio, uint16_t value);
223void GBAAudioWriteSOUND3CNT_X(struct GBAAudio* audio, uint16_t value);
224void GBAAudioWriteSOUND4CNT_LO(struct GBAAudio* audio, uint16_t value);
225void GBAAudioWriteSOUND4CNT_HI(struct GBAAudio* audio, uint16_t value);
226void GBAAudioWriteSOUNDCNT_LO(struct GBAAudio* audio, uint16_t value);
227void GBAAudioWriteSOUNDCNT_HI(struct GBAAudio* audio, uint16_t value);
228void GBAAudioWriteSOUNDCNT_X(struct GBAAudio* audio, uint16_t value);
229
230void GBAAudioWriteWaveRAM(struct GBAAudio* audio, int address, uint32_t value);
231void GBAAudioWriteFIFO(struct GBAAudio* audio, int address, uint32_t value);
232void GBAAudioSampleFIFO(struct GBAAudio* audio, int fifoId);
233
234#endif