swr: add seperate in/out pointers to the noise shaping code

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 5 insertions, 4 deletions

diff --git a/libswresample/dither_template.c b/libswresample/dither_template.c
index b98391be89..4d0074b531 100644
--- a/libswresample/dither_template.c
+++ b/libswresample/dither_template.c
@@ -23,7 +23,7 @@
 ERROR
 #endif
 
-void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *srcs, AudioData *noises, int count){
+void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *dsts, const AudioData *srcs, AudioData *noises, int count){
     int i, j, pos, ch;
     int taps  = s->dither.ns_taps;
     float S   = s->dither.ns_scale;
@@ -31,10 +31,11 @@ void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *srcs, AudioData *noise
 
     for (ch=0; ch<srcs->ch_count; ch++) {
         const float *noise = ((const float *)noises->ch[ch]) + s->dither.noise_pos;
-        DELEM *data = (DELEM*)srcs->ch[ch];
+        const DELEM *src = (const DELEM*)srcs->ch[ch];
+        DELEM *dst = (DELEM*)dsts->ch[ch];
         pos  = s->dither.ns_pos;
         for (i=0; i<count; i++) {
-            double d1, d = data[i]*S_1;
+            double d1, d = src[i]*S_1;
             for(j=0; j<taps; j++)
                 d -= s->dither.ns_coeffs[j] * s->dither.ns_errors[ch][pos + j];
             pos = pos ? pos - 1 : pos - 1 + taps;
@@ -42,7 +43,7 @@ void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *srcs, AudioData *noise
             s->dither.ns_errors[ch][pos + taps] = s->dither.ns_errors[ch][pos] = d1 - d;
             d1 *= S;
             CLIP(d1);
-            data[i] = d1;
+            dst[i] = d1;
         }
     }