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#ifndef ALC_HRTF_H
#define ALC_HRTF_H
#include <memory>
#include <string>
#include "AL/al.h"
#include "AL/alc.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 HrtfHandle;
struct HrtfEntry {
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 EnumeratedHrtf {
std::string name;
HrtfHandle *hrtf;
};
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 { }
static std::unique_ptr<DirectHrtfState> Create(ALsizei num_chans);
DEF_PLACE_NEWDEL()
};
struct AngularPoint {
ALfloat Elev;
ALfloat Azim;
};
al::vector<EnumeratedHrtf> EnumerateHrtf(const char *devname);
HrtfEntry *GetLoadedHrtf(HrtfHandle *handle);
void Hrtf_IncRef(HrtfEntry *hrtf);
void Hrtf_DecRef(HrtfEntry *hrtf);
void GetHrtfCoeffs(const HrtfEntry *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. Note the specified virtual
* positions should be in degrees, not radians!
*/
void BuildBFormatHrtf(const HrtfEntry *Hrtf, DirectHrtfState *state, const ALsizei NumChannels, const AngularPoint *AmbiPoints, const ALfloat (*RESTRICT AmbiMatrix)[MAX_AMBI_COEFFS], const ALsizei AmbiCount, const ALfloat *RESTRICT AmbiOrderHFGain);
#endif /* ALC_HRTF_H */
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