From a9afcccb3c4f01e6e76a1ef67ccb58b7799856bf Mon Sep 17 00:00:00 2001
From: Davide Beatrici <git@davidebeatrici.dev>
Date: Tue, 16 Feb 2021 14:05:36 +0100
Subject: Add USE_MALLOC define, to toggle the use of malloc() and free()
 instead of VLA

This is required for MSVC.
---
 src/celt_lpc.c | 25 +++++++++++++++++++++++++
 src/pitch.c    | 30 ++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/src/celt_lpc.c b/src/celt_lpc.c
index 521351e..ae74763 100644
--- a/src/celt_lpc.c
+++ b/src/celt_lpc.c
@@ -96,7 +96,11 @@ void celt_fir(
          int ord)
 {
    int i,j;
+#ifdef USE_MALLOC
+   opus_val16 *rnum = malloc(sizeof(*rnum) * ord);
+#else
    opus_val16 rnum[ord];
+#endif
    for(i=0;i<ord;i++)
       rnum[i] = num[ord-i-1];
    for (i=0;i<N-3;i+=4)
@@ -119,6 +123,10 @@ void celt_fir(
          sum = MAC16_16(sum,rnum[j],x[i+j-ord]);
       y[i] = ROUND16(sum, SIG_SHIFT);
    }
+
+#ifdef USE_MALLOC
+   free(rnum);
+#endif
 }
 
 void celt_iir(const opus_val32 *_x,
@@ -147,8 +155,13 @@ void celt_iir(const opus_val32 *_x,
 #else
    int i,j;
    celt_assert((ord&3)==0);
+#ifdef USE_MALLOC
+   opus_val16 *rden = malloc(sizeof(*rden) * ord);
+   opus_val16 *y = malloc(sizeof(*y) * (N+ord));
+#else
    opus_val16 rden[ord];
    opus_val16 y[N+ord];
+#endif
    for(i=0;i<ord;i++)
       rden[i] = den[ord-i-1];
    for(i=0;i<ord;i++)
@@ -192,7 +205,11 @@ void celt_iir(const opus_val32 *_x,
    }
    for(i=0;i<ord;i++)
       mem[i] = _y[N-i-1];
+#ifdef USE_MALLOC
+   free(rden);
+   free(y) ;
 #endif
+#endif // SMALL_FOOTPRINT
 }
 
 int _celt_autocorr(
@@ -208,7 +225,11 @@ int _celt_autocorr(
    int fastN=n-lag;
    int shift;
    const opus_val16 *xptr;
+#ifdef USE_MALLOC
+   opus_val16 *xx = malloc(sizeof(*xx) * n);
+#else
    opus_val16 xx[n];
+#endif
    celt_assert(n>0);
    celt_assert(overlap>=0);
    if (overlap == 0)
@@ -275,5 +296,9 @@ int _celt_autocorr(
    }
 #endif
 
+#ifdef USE_MALLOC
+   free(xx);
+#endif
+
    return shift;
 }
diff --git a/src/pitch.c b/src/pitch.c
index bd101a6..9b0271b 100644
--- a/src/pitch.c
+++ b/src/pitch.c
@@ -43,6 +43,10 @@
 #include "celt_lpc.h"
 #include "math.h"
 
+#ifdef USE_MALLOC
+#include <stdlib.h>
+#endif
+
 static void find_best_pitch(opus_val32 *xcorr, opus_val16 *y, int len,
                             int max_pitch, int *best_pitch
 #ifdef FIXED_POINT
@@ -297,9 +301,15 @@ void pitch_search(const opus_val16 *x_lp, opus_val16 *y,
    celt_assert(max_pitch>0);
    lag = len+max_pitch;
 
+#ifdef USE_MALLOC
+   opus_val16 *x_lp4 = malloc(sizeof(*x_lp4) * len>>2);
+   opus_val16 *y_lp4 = malloc(sizeof(*y_lp4) * lag>>2);
+   opus_val32 *xcorr = malloc(sizeof(*xcorr) * max_pitch>>1);
+#else
    opus_val16 x_lp4[len>>2];
    opus_val16 y_lp4[lag>>2];
    opus_val32 xcorr[max_pitch>>1];
+#endif
 
    /* Downsample by 2 again */
    for (j=0;j<len>>2;j++)
@@ -382,6 +392,12 @@ void pitch_search(const opus_val16 *x_lp, opus_val16 *y,
       offset = 0;
    }
    *pitch = 2*best_pitch[0]-offset;
+
+#ifdef USE_MALLOC
+   free(x_lp4);
+   free(y_lp4);
+   free(xcorr);
+#endif
 }
 
 #ifdef FIXED_POINT
@@ -427,7 +443,11 @@ opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod,
    opus_val16 g, g0;
    opus_val16 pg;
    opus_val32 xy,xx,yy,xy2;
+#ifdef USE_MALLOC
+   opus_val32 *xcorr = malloc(sizeof(*xcorr) * 3);
+#else
    opus_val32 xcorr[3];
+#endif
    opus_val32 best_xy, best_yy;
    int offset;
    int minperiod0;
@@ -443,7 +463,11 @@ opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod,
       *T0_=maxperiod-1;
 
    T = T0 = *T0_;
+#ifdef USE_MALLOC
+   opus_val16 *yy_lookup = malloc(sizeof(*yy_lookup) * (maxperiod+1));
+#else
    opus_val32 yy_lookup[maxperiod+1];
+#endif
    dual_inner_prod(x, x, x-T0, N, &xx, &xy);
    yy_lookup[0] = xx;
    yy=xx;
@@ -522,5 +546,11 @@ opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod,
 
    if (*T0_<minperiod0)
       *T0_=minperiod0;
+
+#ifdef USE_MALLOC
+   free(xcorr);
+   free(yy_lookup);
+#endif
+
    return pg;
 }
-- 
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