a27e5e1652
This new method mixes sources normally into a 14-channel buffer with the channels placed all around the listener. HRTF is then applied to the channels given their positions and written to a 2-channel buffer, which gets written out to the device. This method has the benefit that HRTF processing becomes more scalable. The costly HRTF filters are applied to the 14-channel buffer after the mix is done, turning it into a post-process with a fixed overhead. Mixing sources is done with normal non-HRTF methods, so increasing the number of playing sources only incurs normal mixing costs. Another benefit is that it improves B-Format playback since the soundfield gets mixed into speakers covering all three dimensions, which then get filtered based on their locations. The main downside to this is that the spatial resolution of the HRTF dataset does not play a big role anymore. However, the hope is that with ambisonics- based panning, the perceptual position of panned sounds will still be good. It is also an option to increase the number of virtual channels for systems that can handle it, or maybe even decrease it for weaker systems.
63 lines
2.7 KiB
C
63 lines
2.7 KiB
C
#ifndef MIXER_DEFS_H
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#define MIXER_DEFS_H
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#include "AL/alc.h"
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#include "AL/al.h"
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#include "alMain.h"
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#include "alu.h"
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struct MixGains;
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struct HrtfParams;
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struct HrtfState;
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/* C resamplers */
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const ALfloat *Resample_copy32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
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const ALfloat *Resample_point32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
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const ALfloat *Resample_lerp32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
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const ALfloat *Resample_cubic32_C(const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen);
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/* C mixers */
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void MixHrtf_C(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
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ALuint Offset, const ALuint IrSize, const struct HrtfParams *hrtfparams,
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struct HrtfState *hrtfstate, ALuint BufferSize);
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void Mix_C(const ALfloat *data, ALuint OutChans, ALfloat (*restrict OutBuffer)[BUFFERSIZE],
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struct MixGains *Gains, ALuint Counter, ALuint OutPos, ALuint BufferSize);
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/* SSE mixers */
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void MixHrtf_SSE(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
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ALuint Offset, const ALuint IrSize, const struct HrtfParams *hrtfparams,
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struct HrtfState *hrtfstate, ALuint BufferSize);
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void Mix_SSE(const ALfloat *data, ALuint OutChans, ALfloat (*restrict OutBuffer)[BUFFERSIZE],
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struct MixGains *Gains, ALuint Counter, ALuint OutPos, ALuint BufferSize);
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/* SSE resamplers */
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inline void InitiatePositionArrays(ALuint frac, ALuint increment, ALuint *frac_arr, ALuint *pos_arr, ALuint size)
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{
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ALuint i;
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pos_arr[0] = 0;
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frac_arr[0] = frac;
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for(i = 1;i < size;i++)
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{
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ALuint frac_tmp = frac_arr[i-1] + increment;
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pos_arr[i] = pos_arr[i-1] + (frac_tmp>>FRACTIONBITS);
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frac_arr[i] = frac_tmp&FRACTIONMASK;
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}
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}
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const ALfloat *Resample_lerp32_SSE2(const ALfloat *src, ALuint frac, ALuint increment,
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ALfloat *restrict dst, ALuint numsamples);
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const ALfloat *Resample_lerp32_SSE41(const ALfloat *src, ALuint frac, ALuint increment,
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ALfloat *restrict dst, ALuint numsamples);
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/* Neon mixers */
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void MixHrtf_Neon(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
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ALuint Offset, const ALuint IrSize, const struct HrtfParams *hrtfparams,
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struct HrtfState *hrtfstate, ALuint BufferSize);
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void Mix_Neon(const ALfloat *data, ALuint OutChans, ALfloat (*restrict OutBuffer)[BUFFERSIZE],
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struct MixGains *Gains, ALuint Counter, ALuint OutPos, ALuint BufferSize);
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#endif /* MIXER_DEFS_H */
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