4bb6b9589f
It still fades between HRIRs when it changes, but now it selects the nearest one instead of blending the nearest four. Due to the minimum-phase nature of the HRIRs, interpolating between delays lead to some oddities which are exasperated by the fading (and the fading is needed to avoid clicks and pops, and smooth out changes).
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
#ifndef ALC_HRTF_H
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#define ALC_HRTF_H
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#include "AL/al.h"
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#include "AL/alc.h"
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#include "alstring.h"
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struct Hrtf {
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ALuint sampleRate;
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ALuint irSize;
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ALubyte evCount;
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const ALubyte *azCount;
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const ALushort *evOffset;
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const ALshort *coeffs;
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const ALubyte *delays;
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const char *filename;
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struct Hrtf *next;
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};
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typedef struct HrtfEntry {
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al_string name;
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const struct Hrtf *hrtf;
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} HrtfEntry;
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TYPEDEF_VECTOR(HrtfEntry, vector_HrtfEntry)
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#define HRIR_BITS (7)
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#define HRIR_LENGTH (1<<HRIR_BITS)
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#define HRIR_MASK (HRIR_LENGTH-1)
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#define HRTFDELAY_BITS (20)
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#define HRTFDELAY_FRACONE (1<<HRTFDELAY_BITS)
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#define HRTFDELAY_MASK (HRTFDELAY_FRACONE-1)
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void FreeHrtfs(void);
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vector_HrtfEntry EnumerateHrtf(const_al_string devname);
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void FreeHrtfList(vector_HrtfEntry *list);
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void GetHrtfCoeffs(const struct Hrtf *Hrtf, ALfloat elevation, ALfloat azimuth, ALfloat spread, ALfloat gain, ALfloat (*coeffs)[2], ALuint *delays);
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/* Produces HRTF filter coefficients for decoding B-Format. The result will
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* have ACN ordering with N3D normalization. NumChannels must currently be 4,
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* for first-order. Returns the maximum impulse-response length of the
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* generated coefficients.
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*/
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ALuint BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][2], ALuint NumChannels);
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#endif /* ALC_HRTF_H */
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