X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fffv1.h;h=f0bb19350a8992a928e98b68c9e4acf5a5fc7d57;hb=24424a6516f8adc4c73a2fe00fa106b0e49abafd;hp=653138b0702196f186b930df4eb940da774b573c;hpb=8e789d244cc946bc350672eeb02453918b21a09f;p=ffmpeg

diff --git a/libavcodec/ffv1.h b/libavcodec/ffv1.h
index 653138b0702..f0bb19350a8 100644
--- a/libavcodec/ffv1.h
+++ b/libavcodec/ffv1.h
@@ -153,9 +153,7 @@ static av_always_inline int fold(int diff, int bits)
     if (bits == 8)
         diff = (int8_t)diff;
     else {
-        diff +=  1 << (bits  - 1);
-        diff  = av_mod_uintp2(diff, bits);
-        diff -=  1 << (bits  - 1);
+        diff = sign_extend(diff, bits);
     }
 
     return diff;
@@ -176,19 +174,13 @@ static inline void update_vlc_state(VlcState *const state, const int v)
     count++;
 
     if (drift <= -count) {
-        if (state->bias > -128)
-            state->bias--;
+        state->bias = FFMAX(state->bias - 1, -128);
 
-        drift += count;
-        if (drift <= -count)
-            drift = -count + 1;
+        drift = FFMAX(drift + count, -count + 1);
     } else if (drift > 0) {
-        if (state->bias < 127)
-            state->bias++;
+        state->bias = FFMIN(state->bias + 1, 127);
 
-        drift -= count;
-        if (drift > 0)
-            drift = 0;
+        drift = FFMIN(drift - count, 0);
     }
 
     state->drift = drift;