87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
#ifndef ALC_HRTF_H
|
|
#define ALC_HRTF_H
|
|
|
|
#include "AL/al.h"
|
|
#include "AL/alc.h"
|
|
|
|
#include "alMain.h"
|
|
#include "atomic.h"
|
|
#include "vector.h"
|
|
#include "almalloc.h"
|
|
|
|
|
|
#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];
|
|
};
|
|
|
|
|
|
struct HrtfState {
|
|
alignas(16) ALfloat History[HRTF_HISTORY_LENGTH];
|
|
alignas(16) ALfloat Values[HRIR_LENGTH][2];
|
|
};
|
|
|
|
struct HrtfParams {
|
|
alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
|
|
ALsizei Delay[2];
|
|
ALfloat Gain;
|
|
};
|
|
|
|
struct DirectHrtfState {
|
|
/* HRTF filter state for dry buffer content */
|
|
ALsizei Offset{0};
|
|
ALsizei IrSize{0};
|
|
struct {
|
|
alignas(16) ALfloat Values[HRIR_LENGTH][2];
|
|
alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
|
|
} Chan[];
|
|
|
|
DirectHrtfState() noexcept { }
|
|
|
|
DEF_PLACE_NEWDEL()
|
|
};
|
|
|
|
struct AngularPoint {
|
|
ALfloat Elev;
|
|
ALfloat Azim;
|
|
};
|
|
|
|
|
|
al::vector<EnumeratedHrtf> EnumerateHrtf(const char *devname);
|
|
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 (*RESTRICT coeffs)[2], ALsizei *delays);
|
|
|
|
/**
|
|
* Produces HRTF filter coefficients for decoding B-Format, given a set of
|
|
* virtual speaker positions, a matching decoding matrix, and per-order high-
|
|
* frequency gains for the decoder. The calculated impulse responses are
|
|
* ordered and scaled according to the matrix input.
|
|
*/
|
|
void BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei NumChannels, const struct AngularPoint *AmbiPoints, const ALfloat (*RESTRICT AmbiMatrix)[MAX_AMBI_COEFFS], ALsizei AmbiCount, const ALfloat *RESTRICT AmbiOrderHFGain);
|
|
|
|
#endif /* ALC_HRTF_H */
|