1/* Copyright (c) 2013-2016 Jeffrey Pfau
  2 *
  3 * This Source Code Form is subject to the terms of the Mozilla Public
  4 * License, v. 2.0. If a copy of the MPL was not distributed with this
  5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
  6#ifndef GBA_AUDIO_H
  7#define GBA_AUDIO_H
  8
  9#include "util/common.h"
 10#include "macros.h"
 11
 12#include "gb/audio.h"
 13#include "util/circle-buffer.h"
 14
 15struct GBADMA;
 16
 17extern const unsigned GBA_AUDIO_SAMPLES;
 18extern const int GBA_AUDIO_VOLUME_MAX;
 19
 20struct GBAAudioFIFO {
 21	struct CircleBuffer fifo;
 22	int dmaSource;
 23	int8_t sample;
 24};
 25
 26DECL_BITFIELD(GBARegisterSOUNDCNT_HI, uint16_t);
 27DECL_BITS(GBARegisterSOUNDCNT_HI, Volume, 0, 2);
 28DECL_BIT(GBARegisterSOUNDCNT_HI, VolumeChA, 2);
 29DECL_BIT(GBARegisterSOUNDCNT_HI, VolumeChB, 3);
 30DECL_BIT(GBARegisterSOUNDCNT_HI, ChARight, 8);
 31DECL_BIT(GBARegisterSOUNDCNT_HI, ChALeft, 9);
 32DECL_BIT(GBARegisterSOUNDCNT_HI, ChATimer, 10);
 33DECL_BIT(GBARegisterSOUNDCNT_HI, ChAReset, 11);
 34DECL_BIT(GBARegisterSOUNDCNT_HI, ChBRight, 12);
 35DECL_BIT(GBARegisterSOUNDCNT_HI, ChBLeft, 13);
 36DECL_BIT(GBARegisterSOUNDCNT_HI, ChBTimer, 14);
 37DECL_BIT(GBARegisterSOUNDCNT_HI, ChBReset, 15);
 38
 39DECL_BITFIELD(GBARegisterSOUNDBIAS, uint16_t);
 40DECL_BITS(GBARegisterSOUNDBIAS, Bias, 0, 10);
 41DECL_BITS(GBARegisterSOUNDBIAS, Resolution, 14, 2);
 42
 43struct GBAAudio {
 44	struct GBA* p;
 45
 46	struct GBAudio psg;
 47	struct GBAAudioFIFO chA;
 48	struct GBAAudioFIFO chB;
 49
 50	int16_t lastLeft;
 51	int16_t lastRight;
 52	int clock;
 53
 54	uint8_t volume;
 55	bool volumeChA;
 56	bool volumeChB;
 57	bool chARight;
 58	bool chALeft;
 59	bool chATimer;
 60	bool chBRight;
 61	bool chBLeft;
 62	bool chBTimer;
 63	bool enable;
 64
 65	size_t samples;
 66	unsigned sampleRate;
 67
 68	GBARegisterSOUNDBIAS soundbias;
 69
 70	int32_t nextEvent;
 71	int32_t eventDiff;
 72	int32_t nextSample;
 73
 74	int32_t sampleInterval;
 75
 76	bool forceDisableChA;
 77	bool forceDisableChB;
 78	int masterVolume;
 79};
 80
 81struct GBAStereoSample {
 82	int16_t left;
 83	int16_t right;
 84};
 85
 86void GBAAudioInit(struct GBAAudio* audio, size_t samples);
 87void GBAAudioReset(struct GBAAudio* audio);
 88void GBAAudioDeinit(struct GBAAudio* audio);
 89
 90void GBAAudioResizeBuffer(struct GBAAudio* audio, size_t samples);
 91
 92int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles);
 93void GBAAudioScheduleFifoDma(struct GBAAudio* audio, int number, struct GBADMA* info);
 94
 95void GBAAudioWriteSOUND1CNT_LO(struct GBAAudio* audio, uint16_t value);
 96void GBAAudioWriteSOUND1CNT_HI(struct GBAAudio* audio, uint16_t value);
 97void GBAAudioWriteSOUND1CNT_X(struct GBAAudio* audio, uint16_t value);
 98void GBAAudioWriteSOUND2CNT_LO(struct GBAAudio* audio, uint16_t value);
 99void GBAAudioWriteSOUND2CNT_HI(struct GBAAudio* audio, uint16_t value);
100void GBAAudioWriteSOUND3CNT_LO(struct GBAAudio* audio, uint16_t value);
101void GBAAudioWriteSOUND3CNT_HI(struct GBAAudio* audio, uint16_t value);
102void GBAAudioWriteSOUND3CNT_X(struct GBAAudio* audio, uint16_t value);
103void GBAAudioWriteSOUND4CNT_LO(struct GBAAudio* audio, uint16_t value);
104void GBAAudioWriteSOUND4CNT_HI(struct GBAAudio* audio, uint16_t value);
105void GBAAudioWriteSOUNDCNT_LO(struct GBAAudio* audio, uint16_t value);
106void GBAAudioWriteSOUNDCNT_HI(struct GBAAudio* audio, uint16_t value);
107void GBAAudioWriteSOUNDCNT_X(struct GBAAudio* audio, uint16_t value);
108void GBAAudioWriteSOUNDBIAS(struct GBAAudio* audio, uint16_t value);
109
110void GBAAudioWriteWaveRAM(struct GBAAudio* audio, int address, uint32_t value);
111void GBAAudioWriteFIFO(struct GBAAudio* audio, int address, uint32_t value);
112void GBAAudioSampleFIFO(struct GBAAudio* audio, int fifoId, int32_t cycles);
113
114struct GBASerializedState;
115void GBAAudioSerialize(const struct GBAAudio* audio, struct GBASerializedState* state);
116void GBAAudioDeserialize(struct GBAAudio* audio, const struct GBASerializedState* state);
117
118float GBAAudioCalculateRatio(float inputSampleRate, float desiredFPS, float desiredSampleRatio);
119
120#endif