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