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
 11#include "core/log.h"
 12#include "gb/audio.h"
 13#include "util/circle-buffer.h"
 14
 15mLOG_DECLARE_CATEGORY(GBA_AUDIO);
 16
 17struct GBADMA;
 18
 19extern const unsigned GBA_AUDIO_SAMPLES;
 20extern const int GBA_AUDIO_VOLUME_MAX;
 21
 22struct GBAAudioFIFO {
 23	struct CircleBuffer fifo;
 24	int dmaSource;
 25	int8_t sample;
 26};
 27
 28DECL_BITFIELD(GBARegisterSOUNDCNT_HI, uint16_t);
 29DECL_BITS(GBARegisterSOUNDCNT_HI, Volume, 0, 2);
 30DECL_BIT(GBARegisterSOUNDCNT_HI, VolumeChA, 2);
 31DECL_BIT(GBARegisterSOUNDCNT_HI, VolumeChB, 3);
 32DECL_BIT(GBARegisterSOUNDCNT_HI, ChARight, 8);
 33DECL_BIT(GBARegisterSOUNDCNT_HI, ChALeft, 9);
 34DECL_BIT(GBARegisterSOUNDCNT_HI, ChATimer, 10);
 35DECL_BIT(GBARegisterSOUNDCNT_HI, ChAReset, 11);
 36DECL_BIT(GBARegisterSOUNDCNT_HI, ChBRight, 12);
 37DECL_BIT(GBARegisterSOUNDCNT_HI, ChBLeft, 13);
 38DECL_BIT(GBARegisterSOUNDCNT_HI, ChBTimer, 14);
 39DECL_BIT(GBARegisterSOUNDCNT_HI, ChBReset, 15);
 40
 41DECL_BITFIELD(GBARegisterSOUNDBIAS, uint16_t);
 42DECL_BITS(GBARegisterSOUNDBIAS, Bias, 0, 10);
 43DECL_BITS(GBARegisterSOUNDBIAS, Resolution, 14, 2);
 44
 45struct GBAAudio {
 46	struct GBA* p;
 47
 48	struct GBAudio psg;
 49	struct GBAAudioFIFO chA;
 50	struct GBAAudioFIFO chB;
 51
 52	int16_t lastLeft;
 53	int16_t lastRight;
 54	int clock;
 55
 56	uint8_t volume;
 57	bool volumeChA;
 58	bool volumeChB;
 59	bool chARight;
 60	bool chALeft;
 61	bool chATimer;
 62	bool chBRight;
 63	bool chBLeft;
 64	bool chBTimer;
 65	bool enable;
 66
 67	size_t samples;
 68	unsigned sampleRate;
 69
 70	GBARegisterSOUNDBIAS soundbias;
 71
 72	int32_t nextEvent;
 73	int32_t eventDiff;
 74	int32_t nextSample;
 75
 76	int32_t sampleInterval;
 77
 78	bool forceDisableChA;
 79	bool forceDisableChB;
 80	int masterVolume;
 81};
 82
 83struct GBAStereoSample {
 84	int16_t left;
 85	int16_t right;
 86};
 87
 88void GBAAudioInit(struct GBAAudio* audio, size_t samples);
 89void GBAAudioReset(struct GBAAudio* audio);
 90void GBAAudioDeinit(struct GBAAudio* audio);
 91
 92void GBAAudioResizeBuffer(struct GBAAudio* audio, size_t samples);
 93
 94int32_t GBAAudioProcessEvents(struct GBAAudio* audio, int32_t cycles);
 95void GBAAudioScheduleFifoDma(struct GBAAudio* audio, int number, struct GBADMA* info);
 96
 97void GBAAudioWriteSOUND1CNT_LO(struct GBAAudio* audio, uint16_t value);
 98void GBAAudioWriteSOUND1CNT_HI(struct GBAAudio* audio, uint16_t value);
 99void GBAAudioWriteSOUND1CNT_X(struct GBAAudio* audio, uint16_t value);
100void GBAAudioWriteSOUND2CNT_LO(struct GBAAudio* audio, uint16_t value);
101void GBAAudioWriteSOUND2CNT_HI(struct GBAAudio* audio, uint16_t value);
102void GBAAudioWriteSOUND3CNT_LO(struct GBAAudio* audio, uint16_t value);
103void GBAAudioWriteSOUND3CNT_HI(struct GBAAudio* audio, uint16_t value);
104void GBAAudioWriteSOUND3CNT_X(struct GBAAudio* audio, uint16_t value);
105void GBAAudioWriteSOUND4CNT_LO(struct GBAAudio* audio, uint16_t value);
106void GBAAudioWriteSOUND4CNT_HI(struct GBAAudio* audio, uint16_t value);
107void GBAAudioWriteSOUNDCNT_LO(struct GBAAudio* audio, uint16_t value);
108void GBAAudioWriteSOUNDCNT_HI(struct GBAAudio* audio, uint16_t value);
109void GBAAudioWriteSOUNDCNT_X(struct GBAAudio* audio, uint16_t value);
110void GBAAudioWriteSOUNDBIAS(struct GBAAudio* audio, uint16_t value);
111
112void GBAAudioWriteWaveRAM(struct GBAAudio* audio, int address, uint32_t value);
113void GBAAudioWriteFIFO(struct GBAAudio* audio, int address, uint32_t value);
114void GBAAudioSampleFIFO(struct GBAAudio* audio, int fifoId, int32_t cycles);
115
116struct GBASerializedState;
117void GBAAudioSerialize(const struct GBAAudio* audio, struct GBASerializedState* state);
118void GBAAudioDeserialize(struct GBAAudio* audio, const struct GBASerializedState* state);
119
120float GBAAudioCalculateRatio(float inputSampleRate, float desiredFPS, float desiredSampleRatio);
121
122#endif