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 ApplyCoeffs(ALsizei Offset, ALfloat (*restrict Values)[2],
  16                                const ALsizei irSize,
  17                                const ALfloat (*restrict Coeffs)[2],
  18                                ALfloat left, ALfloat right);
  19
  20
  21 void MixHrtf(ALfloat *restrict LeftOut, ALfloat *restrict RightOut,
  22              const ALfloat *data, ALsizei Offset, ALsizei OutPos,
  23              const ALsizei IrSize, MixHrtfParams *hrtfparams, HrtfState *hrtfstate,
  24              ALsizei BufferSize)
  25 {
  26     const ALfloat (*Coeffs)[2] = ASSUME_ALIGNED(hrtfparams->Coeffs, 16);
  27     const ALsizei Delay[2] = { hrtfparams->Delay[0], hrtfparams->Delay[1] };
  28     ALfloat gainstep = hrtfparams->GainStep;
  29     ALfloat gain = hrtfparams->Gain;
  30     ALfloat left, right;
  31     ALsizei pos, i;
  32
  33     for(pos = 0;pos < BufferSize;)
  34     {
  35         ALfloat out[MAX_UPDATE_SAMPLES][2];
  36         ALsizei todo = mini(BufferSize-pos, MAX_UPDATE_SAMPLES);
  37
  38         for(i = 0;i < todo;i++)
  39         {
  40             hrtfstate->History[Offset&HRTF_HISTORY_MASK] = data[pos++];
  41             left = hrtfstate->History[(Offset-Delay[0])&HRTF_HISTORY_MASK];
  42             right = hrtfstate->History[(Offset-Delay[1])&HRTF_HISTORY_MASK];
  43
  44             hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  45             hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  46             Offset++;
  47
  48             ApplyCoeffs(Offset, hrtfstate->Values, IrSize, Coeffs, left, right);
  49             out[i][0] = hrtfstate->Values[Offset&HRIR_MASK][0]*gain;
  50             out[i][1] = hrtfstate->Values[Offset&HRIR_MASK][1]*gain;
  51             gain += gainstep;
  52         }
  53
  54         for(i = 0;i < todo;i++)
  55             LeftOut[OutPos+i] += out[i][0];
  56         for(i = 0;i < todo;i++)
  57             RightOut[OutPos+i] += out[i][1];
  58         OutPos += todo;
  59     }
  60     hrtfparams->Gain = gain;
  61 }
  62
  63 void MixDirectHrtf(ALfloat *restrict LeftOut, ALfloat *restrict RightOut,
  64                    const ALfloat *data, ALsizei Offset, const ALsizei IrSize,
  65                    const ALfloat (*restrict Coeffs)[2], ALfloat (*restrict Values)[2],
  66                    ALsizei BufferSize)
  67 {
  68     ALfloat out[MAX_UPDATE_SAMPLES][2];
  69     ALfloat insample;
  70     ALsizei pos, i;
  71
  72     for(pos = 0;pos < BufferSize;)
  73     {
  74         ALsizei todo = mini(BufferSize-pos, MAX_UPDATE_SAMPLES);
  75
  76         for(i = 0;i < todo;i++)
  77         {
  78             Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  79             Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  80             Offset++;
  81
  82             insample = *(data++);
  83             ApplyCoeffs(Offset, Values, IrSize, Coeffs, insample, insample);
  84             out[i][0] = Values[Offset&HRIR_MASK][0];
  85             out[i][1] = Values[Offset&HRIR_MASK][1];
  86         }
  87
  88         for(i = 0;i < todo;i++)
  89             LeftOut[pos+i] += out[i][0];
  90         for(i = 0;i < todo;i++)
  91             RightOut[pos+i] += out[i][1];
  92         pos += todo;
  93     }
  94 }