avcodec/dsddec: add slice threading support

1 files changed, 8 insertions, 4 deletions

diff --git a/libavcodec/dsd.c b/libavcodec/dsd.c
index 9104f38476..8a1fc21b0d 100644
--- a/libavcodec/dsd.c
+++ b/libavcodec/dsd.c
@@ -56,23 +56,26 @@ void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf,
                           const unsigned char *src, ptrdiff_t src_stride,
                           float *dst, ptrdiff_t dst_stride)
 {
+    unsigned char buf[FIFOSIZE];
     unsigned pos, i;
     unsigned char* p;
     double sum;
 
     pos = s->pos;
 
+    memcpy(buf, s->buf, sizeof(buf));
+
     while (samples-- > 0) {
-        s->buf[pos] = lsbf ? ff_reverse[*src] : *src;
+        buf[pos] = lsbf ? ff_reverse[*src] : *src;
         src += src_stride;
 
-        p = s->buf + ((pos - CTABLES) & FIFOMASK);
+        p = buf + ((pos - CTABLES) & FIFOMASK);
         *p = ff_reverse[*p];
 
         sum = 0.0;
         for (i = 0; i < CTABLES; i++) {
-            unsigned char a = s->buf[(pos                   - i) & FIFOMASK];
-            unsigned char b = s->buf[(pos - (CTABLES*2 - 1) + i) & FIFOMASK];
+            unsigned char a = buf[(pos                   - i) & FIFOMASK];
+            unsigned char b = buf[(pos - (CTABLES*2 - 1) + i) & FIFOMASK];
             sum += ctables[i][a] + ctables[i][b];
         }
 
@@ -83,4 +86,5 @@ void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf,
     }
 
     s->pos = pos;
+    memcpy(s->buf, buf, sizeof(buf));
 }