shithub: pt2-clone

ref: f4fb11ccb42d5fd6ae7b73b8ed18f53fcad3be26
dir: /src/pt2_audio.h/

#pragma once

#include <stdint.h>
#include <stdbool.h>
#include "pt2_header.h" // AMIGA_VOICES

// adding this prevents denormalized numbers, which is slow
#define DENORMAL_OFFSET 1e-15

typedef struct rcFilter_t
{
	double buffer[2];
	double c, c2, g, cg;
} rcFilter_t;

typedef struct audio_t
{
	volatile bool locked, isSampling;

	bool forceMixerOff;
	double bpmTab[256-32], bpmTab28kHz[256-32], bpmTab22kHz[256-32], bpmTabMod2Wav[256-32];
	uint32_t outputRate, audioBufferSize;
	double dPeriodToDeltaDiv;

	double dSamplesPerTick, dTickSampleCounter;

	// for audio sampling
	bool rescanAudioDevicesSupported;

	// for audio/video syncing
	bool resetSyncTickTimeFlag;
	uint64_t tickTimeLengthTab[224];
} audio_t;

typedef struct voice_t
{
	volatile bool active;

	const int8_t *data, *newData;
	int32_t length, newLength, pos;
	double dVolume, dDelta, dDeltaMul, dPhase, dLastDelta, dLastDeltaMul, dLastPhase, dPanL, dPanR;

	// used for pt2_sync.c
	uint8_t syncFlags;
	uint8_t syncVolume;
	int32_t syncPeriod;
	int32_t syncTriggerLength;
	const int8_t *syncTriggerData;
} paulaVoice_t;

void setSyncTickTimeLen(uint32_t timeLen, uint32_t timeLenFrac);
void resetCachedMixerPeriod(void);
void resetAudioDithering(void);
void calcRCFilterCoeffs(const double sr, const double hz, rcFilter_t *f);
void clearRCFilterState(rcFilter_t *f);
void RCLowPassFilter(rcFilter_t *f, const double *in, double *out);
void RCHighPassFilter(rcFilter_t *f, const double *in, double *out);
void RCLowPassFilterMono(rcFilter_t *f, const double in, double *out);
void RCHighPassFilterMono(rcFilter_t *f, const double in, double *out);
void normalize32bitSigned(int32_t *sampleData, uint32_t sampleLength);
void normalize16bitSigned(int16_t *sampleData, uint32_t sampleLength);
void normalize8bitFloatSigned(float *fSampleData, uint32_t sampleLength);
void normalize8bitDoubleSigned(double *dSampleData, uint32_t sampleLength);
void setLEDFilter(bool state, bool doLockAudio);
void toggleLEDFilter(void);
void toggleAmigaPanMode(void);
void toggleA500Filters(void);
void paulaStopDMA(int32_t ch);
void paulaStartDMA(int32_t ch);
void paulaSetPeriod(int32_t ch, uint16_t period);
void paulaSetVolume(int32_t ch, uint16_t vol);
void paulaSetLength(int32_t ch, uint16_t len);
void paulaSetData(int32_t ch, const int8_t *src);
void lockAudio(void);
void unlockAudio(void);
void mixerUpdateLoops(void);
void mixerKillVoice(int32_t ch);
void turnOffVoices(void);
void mixerCalcVoicePans(uint8_t stereoSeparation);
void outputAudio(int16_t *target, int32_t numSamples);

extern audio_t audio; // pt2_audio.c
extern paulaVoice_t paula[AMIGA_VOICES]; // pt2_audio.c