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adx: use 12-bit coefficients instead of 14-bit to avoid integer overflow
[ffmpeg.git]
/
libavcodec
/
adxenc.c
diff --git
a/libavcodec/adxenc.c
b/libavcodec/adxenc.c
index
fde0b82
..
7225c31
100644
(file)
--- a/
libavcodec/adxenc.c
+++ b/
libavcodec/adxenc.c
@@
-48,7
+48,7
@@
static void adx_encode(unsigned char *adx,const short *wav,
s2 = prev->s2;
for(i=0;i<32;i++) {
s0 = wav[i];
- d = ((s0
<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL
;
+ d = ((s0
<< COEFF_BITS) - COEFF1 * s1 + COEFF2 * s2) >> COEFF_BITS
;
data[i]=d;
if (max<d) max=d;
if (min>d) min=d;