85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
#ifndef ALC_HRTF_H
|
|
#define ALC_HRTF_H
|
|
|
|
#include "AL/al.h"
|
|
#include "AL/alc.h"
|
|
|
|
#include "alMain.h"
|
|
#include "alstring.h"
|
|
#include "atomic.h"
|
|
|
|
|
|
/* The maximum number of virtual speakers used to generate HRTF coefficients
|
|
* for decoding B-Format.
|
|
*/
|
|
#define HRTF_AMBI_MAX_CHANNELS 16
|
|
|
|
|
|
#define HRTF_HISTORY_BITS (6)
|
|
#define HRTF_HISTORY_LENGTH (1<<HRTF_HISTORY_BITS)
|
|
#define HRTF_HISTORY_MASK (HRTF_HISTORY_LENGTH-1)
|
|
|
|
#define HRIR_BITS (7)
|
|
#define HRIR_LENGTH (1<<HRIR_BITS)
|
|
#define HRIR_MASK (HRIR_LENGTH-1)
|
|
|
|
|
|
struct HrtfEntry;
|
|
|
|
struct Hrtf {
|
|
RefCount ref;
|
|
|
|
ALuint sampleRate;
|
|
ALsizei irSize;
|
|
|
|
ALfloat distance;
|
|
ALubyte evCount;
|
|
|
|
const ALubyte *azCount;
|
|
const ALushort *evOffset;
|
|
const ALfloat (*coeffs)[2];
|
|
const ALubyte (*delays)[2];
|
|
};
|
|
|
|
|
|
typedef struct HrtfState {
|
|
alignas(16) ALfloat History[HRTF_HISTORY_LENGTH];
|
|
alignas(16) ALfloat Values[HRIR_LENGTH][2];
|
|
} HrtfState;
|
|
|
|
typedef struct HrtfParams {
|
|
alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
|
|
ALsizei Delay[2];
|
|
ALfloat Gain;
|
|
} HrtfParams;
|
|
|
|
typedef struct DirectHrtfState {
|
|
/* HRTF filter state for dry buffer content */
|
|
ALsizei Offset;
|
|
ALsizei IrSize;
|
|
struct {
|
|
alignas(16) ALfloat Values[HRIR_LENGTH][2];
|
|
alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
|
|
} Chan[];
|
|
} DirectHrtfState;
|
|
|
|
|
|
void FreeHrtfs(void);
|
|
|
|
vector_EnumeratedHrtf EnumerateHrtf(const_al_string devname);
|
|
void FreeHrtfList(vector_EnumeratedHrtf *list);
|
|
struct Hrtf *GetLoadedHrtf(struct HrtfEntry *entry);
|
|
void Hrtf_IncRef(struct Hrtf *hrtf);
|
|
void Hrtf_DecRef(struct Hrtf *hrtf);
|
|
|
|
void GetHrtfCoeffs(const struct Hrtf *Hrtf, ALfloat elevation, ALfloat azimuth, ALfloat spread, ALfloat (*coeffs)[2], ALsizei *delays);
|
|
|
|
/**
|
|
* Produces HRTF filter coefficients for decoding B-Format, given a set of
|
|
* virtual speaker positions and HF/LF matrices for decoding to them. The
|
|
* returned coefficients are ordered and scaled according to the matrices.
|
|
*/
|
|
void BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei NumChannels, const ALfloat (*restrict AmbiPoints)[2], const ALfloat (*restrict AmbiMatrix)[2][MAX_AMBI_COEFFS], ALsizei AmbiCount);
|
|
|
|
#endif /* ALC_HRTF_H */
|