50 lines
1.4 KiB
C
50 lines
1.4 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 "alMain.h"
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#include "alstring.h"
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struct Hrtf {
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ALuint sampleRate;
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ALsizei 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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#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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/* The maximum number of virtual speakers used to generate HRTF coefficients
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* for decoding B-Format.
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*/
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#define HRTF_AMBI_MAX_CHANNELS 16
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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], ALsizei *delays);
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/**
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* Produces HRTF filter coefficients for decoding B-Format, given a set of
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* virtual speaker positions and HF/LF matrices for decoding to them. The
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* returned coefficients are ordered and scaled according to the matrices.
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* Returns the maximum impulse-response length of the generated coefficients.
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*/
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ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, DirectHrtfState *state, ALsizei NumChannels, const ALfloat (*restrict AmbiPoints)[2], const ALfloat (*restrict AmbiMatrix)[2][MAX_AMBI_COEFFS], ALsizei AmbiCount);
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#endif /* ALC_HRTF_H */
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