Change yadif to not use out of picture lines.

Fixes issue2272.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vf_yadif.c

@@ -50,42 +50,42 @@ typedef struct {
     AVFilterBufferRef *out;
     void (*filter_line)(uint8_t *dst,
                         uint8_t *prev, uint8_t *cur, uint8_t *next,
-                        int w, int refs, int parity, int mode);
+                        int w, int prefs, int mrefs, int parity, int mode);
 } YADIFContext;
 
 static void filter_line_c(uint8_t *dst,
                           uint8_t *prev, uint8_t *cur, uint8_t *next,
-                          int w, int refs, int parity, int mode)
+                          int w, int prefs, int mrefs, int parity, int mode)
 {
     int x;
     uint8_t *prev2 = parity ? prev : cur ;
     uint8_t *next2 = parity ? cur  : next;
     for (x = 0;  x < w; x++) {
-        int c = cur[-refs];
+        int c = cur[mrefs];
         int d = (prev2[0] + next2[0])>>1;
-        int e = cur[+refs];
+        int e = cur[prefs];
         int temporal_diff0 = FFABS(prev2[0] - next2[0]);
-        int temporal_diff1 =(FFABS(prev[-refs] - c) + FFABS(prev[+refs] - e) )>>1;
-        int temporal_diff2 =(FFABS(next[-refs] - c) + FFABS(next[+refs] - e) )>>1;
+        int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e) )>>1;
+        int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e) )>>1;
         int diff = FFMAX3(temporal_diff0>>1, temporal_diff1, temporal_diff2);
         int spatial_pred = (c+e)>>1;
-        int spatial_score = FFABS(cur[-refs-1] - cur[+refs-1]) + FFABS(c-e)
-                          + FFABS(cur[-refs+1] - cur[+refs+1]) - 1;
+        int spatial_score = FFABS(cur[mrefs-1] - cur[prefs-1]) + FFABS(c-e)
+                          + FFABS(cur[mrefs+1] - cur[prefs+1]) - 1;
 
 #define CHECK(j)\
-    {   int score = FFABS(cur[-refs-1+j] - cur[+refs-1-j])\
-                  + FFABS(cur[-refs  +j] - cur[+refs  -j])\
-                  + FFABS(cur[-refs+1+j] - cur[+refs+1-j]);\
+    {   int score = FFABS(cur[mrefs-1+j] - cur[prefs-1-j])\
+                  + FFABS(cur[mrefs  +j] - cur[prefs  -j])\
+                  + FFABS(cur[mrefs+1+j] - cur[prefs+1-j]);\
         if (score < spatial_score) {\
             spatial_score= score;\
-            spatial_pred= (cur[-refs  +j] + cur[+refs  -j])>>1;\
+            spatial_pred= (cur[mrefs  +j] + cur[prefs  -j])>>1;\
 
         CHECK(-1) CHECK(-2) }} }}
         CHECK( 1) CHECK( 2) }} }}
 
         if (mode < 2) {
-            int b = (prev2[-2*refs] + next2[-2*refs])>>1;
-            int f = (prev2[+2*refs] + next2[+2*refs])>>1;
+            int b = (prev2[2*mrefs] + next2[2*mrefs])>>1;
+            int f = (prev2[2*prefs] + next2[2*prefs])>>1;
 #if 0
             int a = cur[-3*refs];
             int g = cur[+3*refs];
@@ -133,7 +133,8 @@ static void filter(AVFilterContext *ctx, AVFilterBufferRef *dstpic,
                 uint8_t *cur  = &yadif->cur ->data[i][y*refs];
                 uint8_t *next = &yadif->next->data[i][y*refs];
                 uint8_t *dst  = &dstpic->data[i][y*dstpic->linesize[i]];
-                yadif->filter_line(dst, prev, cur, next, w, refs, parity ^ tff, yadif->mode);
+                int     mode  = y==1 || y+2==h ? 2 : yadif->mode;
+                yadif->filter_line(dst, prev, cur, next, w, y+1<h ? refs : -refs, y ? -refs : refs, parity ^ tff, mode);
             } else {
                 memcpy(&dstpic->data[i][y*dstpic->linesize[i]],
                        &yadif->cur->data[i][y*refs], w);

libavfilter/x86/yadif_template.c

@@ -105,7 +105,7 @@
 
 void RENAME(ff_yadif_filter_line)(uint8_t *dst,
                                   uint8_t *prev, uint8_t *cur, uint8_t *next,
-                                  int w, int refs, int parity, int mode)
+                                  int w, int prefs, int mrefs, int parity, int mode)
 {
     DECLARE_ALIGNED(16, uint8_t, tmp0[16]);
     DECLARE_ALIGNED(16, uint8_t, tmp1[16]);
@@ -226,8 +226,8 @@ void RENAME(ff_yadif_filter_line)(uint8_t *dst,
             :[prev] "r"(prev),\
              [cur]  "r"(cur),\
              [next] "r"(next),\
-             [prefs]"r"((x86_reg)refs),\
-             [mrefs]"r"((x86_reg)-refs),\
+             [prefs]"r"((x86_reg)prefs),\
+             [mrefs]"r"((x86_reg)mrefs),\
              [mode] "g"(mode)\
         );\
         __asm__ volatile(MOV" "MM"1, %0" :"=m"(*dst));\

libavfilter/yadif.h

@@ -23,14 +23,14 @@
 
 void ff_yadif_filter_line_mmx(uint8_t *dst,
                               uint8_t *prev, uint8_t *cur, uint8_t *next,
-                              int w, int refs, int parity, int mode);
+                              int w, int prefs, int mrefs, int parity, int mode);
 
 void ff_yadif_filter_line_sse2(uint8_t *dst,
                                uint8_t *prev, uint8_t *cur, uint8_t *next,
-                               int w, int refs, int parity, int mode);
+                               int w, int prefs, int mrefs, int parity, int mode);
 
 void ff_yadif_filter_line_ssse3(uint8_t *dst,
                                 uint8_t *prev, uint8_t *cur, uint8_t *next,
-                                int w, int refs, int parity, int mode);
+                                int w, int prefs, int mrefs, int parity, int mode);
 
 #endif /* AVFILTER_YADIF_H */