Revert "remove vlas in celt_lpc.c and pitch.c"

This reverts commit c1dcd55.

Author: sleepybishop

src/celt_lpc.c

@@ -96,7 +96,7 @@ void celt_fir(
          int ord)
 {
    int i,j;
-   opus_val16 *rnum = calloc(sizeof(opus_val16), ord);
+   opus_val16 rnum[ord];
    for(i=0;i<ord;i++)
       rnum[i] = num[ord-i-1];
    for (i=0;i<N-3;i+=4)
@@ -119,7 +119,6 @@ void celt_fir(
          sum = MAC16_16(sum,rnum[j],x[i+j-ord]);
       y[i] = ROUND16(sum, SIG_SHIFT);
    }
-   free(rnum);
 }
 
 void celt_iir(const opus_val32 *_x,
@@ -148,9 +147,8 @@ void celt_iir(const opus_val32 *_x,
 #else
    int i,j;
    celt_assert((ord&3)==0);
-   opus_val16 *rden = calloc(sizeof(opus_val16), ord);
-   opus_val16 *y = calloc(sizeof(opus_val16), N+ord);
-
+   opus_val16 rden[ord];
+   opus_val16 y[N+ord];
    for(i=0;i<ord;i++)
       rden[i] = den[ord-i-1];
    for(i=0;i<ord;i++)
@@ -194,8 +192,6 @@ void celt_iir(const opus_val32 *_x,
    }
    for(i=0;i<ord;i++)
       mem[i] = _y[N-i-1];
-   free(rden);
-   free(y);
 #endif
 }
 
@@ -212,8 +208,7 @@ int _celt_autocorr(
    int fastN=n-lag;
    int shift;
    const opus_val16 *xptr;
-   opus_val16 *xx = calloc(sizeof(opus_val16), n);
-
+   opus_val16 xx[n];
    celt_assert(n>0);
    celt_assert(overlap>=0);
    if (overlap == 0)
@@ -279,6 +274,6 @@ int _celt_autocorr(
       shift += shift2;
    }
 #endif
-   free(xx);
+
    return shift;
 }

src/pitch.c

@@ -297,9 +297,9 @@ void pitch_search(const opus_val16 *x_lp, opus_val16 *y,
    celt_assert(max_pitch>0);
    lag = len+max_pitch;
 
-   opus_val16 *x_lp4 = calloc(sizeof(opus_val16), len>>2);
-   opus_val16 *y_lp4 = calloc(sizeof(opus_val16), lag>>2);
-   opus_val32 *xcorr = calloc(sizeof(opus_val32), max_pitch>>1);
+   opus_val16 x_lp4[len>>2];
+   opus_val16 y_lp4[lag>>2];
+   opus_val32 xcorr[max_pitch>>1];
 
    /* Downsample by 2 again */
    for (j=0;j<len>>2;j++)
@@ -382,9 +382,6 @@ void pitch_search(const opus_val16 *x_lp, opus_val16 *y,
       offset = 0;
    }
    *pitch = 2*best_pitch[0]-offset;
-   free(xcorr);
-   free(x_lp4);
-   free(y_lp4);
 }
 
 #ifdef FIXED_POINT
@@ -446,7 +443,7 @@ opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod,
       *T0_=maxperiod-1;
 
    T = T0 = *T0_;
-   opus_val32 *yy_lookup = calloc(sizeof(opus_val32), maxperiod+1);
+   opus_val32 yy_lookup[maxperiod+1];
    dual_inner_prod(x, x, x-T0, N, &xx, &xy);
    yy_lookup[0] = xx;
    yy=xx;
@@ -505,7 +502,6 @@ opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod,
          g = g1;
       }
    }
-   free(yy_lookup);
    best_xy = MAX32(0, best_xy);
    if (best_yy <= best_xy)
       pg = Q15ONE;