Alc/mixer_c.c

   1 #include "config.h"
   2
   3 #include <assert.h>
   4
   5 #include "alMain.h"
   6 #include "alu.h"
   7 #include "alSource.h"
   8 #include "alAuxEffectSlot.h"
   9
  10
  11 static inline ALfloat point32(const ALfloat *restrict vals, ALsizei UNUSED(frac))
  12 { return vals[0]; }
  13 static inline ALfloat lerp32(const ALfloat *restrict vals, ALsizei frac)
  14 { return lerp(vals[0], vals[1], frac * (1.0f/FRACTIONONE)); }
  15 static inline ALfloat fir4_32(const ALfloat *restrict vals, ALsizei frac)
  16 { return resample_fir4(vals[-1], vals[0], vals[1], vals[2], frac); }
  17
  18
  19 const ALfloat *Resample_copy32_C(const InterpState* UNUSED(state),
  20   const ALfloat *restrict src, ALsizei UNUSED(frac), ALint UNUSED(increment),
  21   ALfloat *restrict dst, ALsizei numsamples)
  22 {
  23 #if defined(HAVE_SSE) || defined(HAVE_NEON)
  24     /* Avoid copying the source data if it's aligned like the destination. */
  25     if((((intptr_t)src)&15) == (((intptr_t)dst)&15))
  26         return src;
  27 #endif
  28     memcpy(dst, src, numsamples*sizeof(ALfloat));
  29     return dst;
  30 }
  31
  32 #define DECL_TEMPLATE(Sampler)                                                \
  33 const ALfloat *Resample_##Sampler##_C(const InterpState* UNUSED(state),       \
  34   const ALfloat *restrict src, ALsizei frac, ALint increment,                 \
  35   ALfloat *restrict dst, ALsizei numsamples)                                  \
  36 {                                                                             \
  37     ALsizei i;                                                                \
  38     for(i = 0;i < numsamples;i++)                                             \
  39     {                                                                         \
  40         dst[i] = Sampler(src, frac);                                          \
  41                                                                               \
  42         frac += increment;                                                    \
  43         src  += frac>>FRACTIONBITS;                                           \
  44         frac &= FRACTIONMASK;                                                 \
  45     }                                                                         \
  46     return dst;                                                               \
  47 }
  48
  49 DECL_TEMPLATE(point32)
  50 DECL_TEMPLATE(lerp32)
  51 DECL_TEMPLATE(fir4_32)
  52
  53 #undef DECL_TEMPLATE
  54
  55 const ALfloat *Resample_bsinc32_C(const InterpState *state, const ALfloat *restrict src,
  56                                   ALsizei frac, ALint increment, ALfloat *restrict dst,
  57                                   ALsizei dstlen)
  58 {
  59     const ALfloat *fil, *scd, *phd, *spd;
  60     const ALfloat sf = state->bsinc.sf;
  61     const ALsizei m = state->bsinc.m;
  62     ALsizei j_f, pi, i;
  63     ALfloat pf, r;
  64
  65     src += state->bsinc.l;
  66     for(i = 0;i < dstlen;i++)
  67     {
  68         // Calculate the phase index and factor.
  69 #define FRAC_PHASE_BITDIFF (FRACTIONBITS-BSINC_PHASE_BITS)
  70         pi = frac >> FRAC_PHASE_BITDIFF;
  71         pf = (frac & ((1<<FRAC_PHASE_BITDIFF)-1)) * (1.0f/(1<<FRAC_PHASE_BITDIFF));
  72 #undef FRAC_PHASE_BITDIFF
  73
  74         fil = ASSUME_ALIGNED(state->bsinc.coeffs[pi].filter, 16);
  75         scd = ASSUME_ALIGNED(state->bsinc.coeffs[pi].scDelta, 16);
  76         phd = ASSUME_ALIGNED(state->bsinc.coeffs[pi].phDelta, 16);
  77         spd = ASSUME_ALIGNED(state->bsinc.coeffs[pi].spDelta, 16);
  78
  79         // Apply the scale and phase interpolated filter.
  80         r = 0.0f;
  81         for(j_f = 0;j_f < m;j_f++)
  82             r += (fil[j_f] + sf*scd[j_f] + pf*(phd[j_f] + sf*spd[j_f])) * src[j_f];
  83         dst[i] = r;
  84
  85         frac += increment;
  86         src  += frac>>FRACTIONBITS;
  87         frac &= FRACTIONMASK;
  88     }
  89     return dst;
  90 }
  91
  92
  93 void ALfilterState_processC(ALfilterState *filter, ALfloat *restrict dst, const ALfloat *restrict src, ALsizei numsamples)
  94 {
  95     ALsizei i;
  96     if(numsamples > 1)
  97     {
  98         dst[0] = filter->b0 * src[0] +
  99                  filter->b1 * filter->x[0] +
 100                  filter->b2 * filter->x[1] -
 101                  filter->a1 * filter->y[0] -
 102                  filter->a2 * filter->y[1];
 103         dst[1] = filter->b0 * src[1] +
 104                  filter->b1 * src[0] +
 105                  filter->b2 * filter->x[0] -
 106                  filter->a1 * dst[0] -
 107                  filter->a2 * filter->y[0];
 108         for(i = 2;i < numsamples;i++)
 109             dst[i] = filter->b0 * src[i] +
 110                      filter->b1 * src[i-1] +
 111                      filter->b2 * src[i-2] -
 112                      filter->a1 * dst[i-1] -
 113                      filter->a2 * dst[i-2];
 114         filter->x[0] = src[i-1];
 115         filter->x[1] = src[i-2];
 116         filter->y[0] = dst[i-1];
 117         filter->y[1] = dst[i-2];
 118     }
 119     else if(numsamples == 1)
 120     {
 121         dst[0] = filter->b0 * src[0] +
 122                  filter->b1 * filter->x[0] +
 123                  filter->b2 * filter->x[1] -
 124                  filter->a1 * filter->y[0] -
 125                  filter->a2 * filter->y[1];
 126         filter->x[1] = filter->x[0];
 127         filter->x[0] = src[0];
 128         filter->y[1] = filter->y[0];
 129         filter->y[0] = dst[0];
 130     }
 131 }
 132
 133
 134 static inline void ApplyCoeffs(ALsizei Offset, ALfloat (*restrict Values)[2],
 135                                const ALsizei IrSize,
 136                                const ALfloat (*restrict Coeffs)[2],
 137                                ALfloat left, ALfloat right)
 138 {
 139     ALsizei c;
 140     for(c = 0;c < IrSize;c++)
 141     {
 142         const ALsizei off = (Offset+c)&HRIR_MASK;
 143         Values[off][0] += Coeffs[c][0] * left;
 144         Values[off][1] += Coeffs[c][1] * right;
 145     }
 146 }
 147
 148 #define MixHrtf MixHrtf_C
 149 #define MixDirectHrtf MixDirectHrtf_C
 150 #include "mixer_inc.c"
 151 #undef MixHrtf
 152
 153
 154 void Mix_C(const ALfloat *data, ALsizei OutChans, ALfloat (*restrict OutBuffer)[BUFFERSIZE],
 155            ALfloat *CurrentGains, const ALfloat *TargetGains, ALsizei Counter, ALsizei OutPos,
 156            ALsizei BufferSize)
 157 {
 158     ALfloat gain, delta, step;
 159     ALsizei c;
 160
 161     delta = (Counter > 0) ? 1.0f/(ALfloat)Counter : 0.0f;
 162
 163     for(c = 0;c < OutChans;c++)
 164     {
 165         ALsizei pos = 0;
 166         gain = CurrentGains[c];
 167         step = (TargetGains[c] - gain) * delta;
 168         if(fabsf(step) > FLT_EPSILON)
 169         {
 170             ALsizei minsize = mini(BufferSize, Counter);
 171             for(;pos < minsize;pos++)
 172             {
 173                 OutBuffer[c][OutPos+pos] += data[pos]*gain;
 174                 gain += step;
 175             }
 176             if(pos == Counter)
 177                 gain = TargetGains[c];
 178             CurrentGains[c] = gain;
 179         }
 180
 181         if(!(fabsf(gain) > GAIN_SILENCE_THRESHOLD))
 182             continue;
 183         for(;pos < BufferSize;pos++)
 184             OutBuffer[c][OutPos+pos] += data[pos]*gain;
 185     }
 186 }
 187
 188 /* Basically the inverse of the above. Rather than one input going to multiple
 189  * outputs (each with its own gain), it's multiple inputs (each with its own
 190  * gain) going to one output. This applies one row (vs one column) of a matrix
 191  * transform. And as the matrices are more or less static once set up, no
 192  * stepping is necessary.
 193  */
 194 void MixRow_C(ALfloat *OutBuffer, const ALfloat *Gains, const ALfloat (*restrict data)[BUFFERSIZE], ALsizei InChans, ALsizei InPos, ALsizei BufferSize)
 195 {
 196     ALsizei c, i;
 197
 198     for(c = 0;c < InChans;c++)
 199     {
 200         ALfloat gain = Gains[c];
 201         if(!(fabsf(gain) > GAIN_SILENCE_THRESHOLD))
 202             continue;
 203
 204         for(i = 0;i < BufferSize;i++)
 205             OutBuffer[i] += data[c][InPos+i] * gain;
 206     }
 207 }