Alc/mixer_inc.c

   1 #include "config.h"
   2
   3 #include "alMain.h"
   4 #include "alSource.h"
   5
   6 #include "hrtf.h"
   7 #include "mixer_defs.h"
   8 #include "align.h"
   9 #include "alu.h"
  10
  11
  12 #define MAX_UPDATE_SAMPLES 128
  13
  14
  15 static inline void ApplyCoeffsStep(ALuint Offset, ALfloat (*restrict Values)[2],
  16                                    const ALuint irSize,
  17                                    ALfloat (*restrict Coeffs)[2],
  18                                    const ALfloat (*restrict CoeffStep)[2],
  19                                    ALfloat left, ALfloat right);
  20 static inline void ApplyCoeffs(ALuint Offset, ALfloat (*restrict Values)[2],
  21                                const ALuint irSize,
  22                                ALfloat (*restrict Coeffs)[2],
  23                                ALfloat left, ALfloat right);
  24
  25
  26 void MixHrtf(ALfloat (*restrict OutBuffer)[BUFFERSIZE], ALuint lidx, ALuint ridx,
  27              const ALfloat *data, ALuint Counter, ALuint Offset, ALuint OutPos,
  28              const ALuint IrSize, const MixHrtfParams *hrtfparams, HrtfState *hrtfstate,
  29              ALuint BufferSize)
  30 {
  31     ALfloat (*Coeffs)[2] = hrtfparams->Current->Coeffs;
  32     ALuint Delay[2] = { hrtfparams->Current->Delay[0], hrtfparams->Current->Delay[1] };
  33     ALfloat out[MAX_UPDATE_SAMPLES][2];
  34     ALfloat left, right;
  35     ALuint minsize;
  36     ALuint pos, i;
  37
  38     pos = 0;
  39     if(Counter == 0)
  40         goto skip_stepping;
  41
  42     minsize = minu(BufferSize, Counter);
  43     while(pos < minsize)
  44     {
  45         ALuint todo = minu(minsize-pos, MAX_UPDATE_SAMPLES);
  46
  47         for(i = 0;i < todo;i++)
  48         {
  49             hrtfstate->History[Offset&HRTF_HISTORY_MASK] = data[pos++];
  50             left  = lerp(hrtfstate->History[(Offset-(Delay[0]>>HRTFDELAY_BITS))&HRTF_HISTORY_MASK],
  51                          hrtfstate->History[(Offset-(Delay[0]>>HRTFDELAY_BITS)-1)&HRTF_HISTORY_MASK],
  52                          (Delay[0]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  53             right = lerp(hrtfstate->History[(Offset-(Delay[1]>>HRTFDELAY_BITS))&HRTF_HISTORY_MASK],
  54                          hrtfstate->History[(Offset-(Delay[1]>>HRTFDELAY_BITS)-1)&HRTF_HISTORY_MASK],
  55                          (Delay[1]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  56
  57             Delay[0] += hrtfparams->Steps.Delay[0];
  58             Delay[1] += hrtfparams->Steps.Delay[1];
  59
  60             hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  61             hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  62             Offset++;
  63
  64             ApplyCoeffsStep(Offset, hrtfstate->Values, IrSize, Coeffs, hrtfparams->Steps.Coeffs, left, right);
  65             out[i][0] = hrtfstate->Values[Offset&HRIR_MASK][0];
  66             out[i][1] = hrtfstate->Values[Offset&HRIR_MASK][1];
  67         }
  68
  69         for(i = 0;i < todo;i++)
  70             OutBuffer[lidx][OutPos+i] += out[i][0];
  71         for(i = 0;i < todo;i++)
  72             OutBuffer[ridx][OutPos+i] += out[i][1];
  73         OutPos += todo;
  74     }
  75
  76     if(pos == Counter)
  77     {
  78         *hrtfparams->Current = *hrtfparams->Target;
  79         Delay[0] = hrtfparams->Target->Delay[0];
  80         Delay[1] = hrtfparams->Target->Delay[1];
  81     }
  82     else
  83     {
  84         hrtfparams->Current->Delay[0] = Delay[0];
  85         hrtfparams->Current->Delay[1] = Delay[1];
  86     }
  87
  88 skip_stepping:
  89     Delay[0] >>= HRTFDELAY_BITS;
  90     Delay[1] >>= HRTFDELAY_BITS;
  91     while(pos < BufferSize)
  92     {
  93         ALuint todo = minu(BufferSize-pos, MAX_UPDATE_SAMPLES);
  94
  95         for(i = 0;i < todo;i++)
  96         {
  97             hrtfstate->History[Offset&HRTF_HISTORY_MASK] = data[pos++];
  98             left = hrtfstate->History[(Offset-Delay[0])&HRTF_HISTORY_MASK];
  99             right = hrtfstate->History[(Offset-Delay[1])&HRTF_HISTORY_MASK];
 100
 101             hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
 102             hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
 103             Offset++;
 104
 105             ApplyCoeffs(Offset, hrtfstate->Values, IrSize, Coeffs, left, right);
 106             out[i][0] = hrtfstate->Values[Offset&HRIR_MASK][0];
 107             out[i][1] = hrtfstate->Values[Offset&HRIR_MASK][1];
 108         }
 109
 110         for(i = 0;i < todo;i++)
 111             OutBuffer[lidx][OutPos+i] += out[i][0];
 112         for(i = 0;i < todo;i++)
 113             OutBuffer[ridx][OutPos+i] += out[i][1];
 114         OutPos += todo;
 115     }
 116 }