avcodec/rv34: fix edge emu with uv stride <= 25

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

libavcodec/rv34.c

@@ -672,6 +672,7 @@ static inline void rv34_mc(RV34DecContext *r, const int block_type,
     int dxy, mx, my, umx, umy, lx, ly, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride + mv_off;
     int is16x16 = 1;
+    int emu = 0;
 
     if(thirdpel){
         int chroma_mx, chroma_my;
@@ -723,8 +724,6 @@ static inline void rv34_mc(RV34DecContext *r, const int block_type,
     if(s->h_edge_pos - (width << 3) < 6 || s->v_edge_pos - (height << 3) < 6 ||
        (unsigned)(src_x - !!lx*2) > s->h_edge_pos - !!lx*2 - (width <<3) - 4 ||
        (unsigned)(src_y - !!ly*2) > s->v_edge_pos - !!ly*2 - (height<<3) - 4) {
-        uint8_t *uvbuf = s->edge_emu_buffer + 22 * s->linesize;
-
         srcY -= 2 + 2*s->linesize;
         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
                                  s->linesize, s->linesize,
@@ -732,18 +731,7 @@ static inline void rv34_mc(RV34DecContext *r, const int block_type,
                                  src_x - 2, src_y - 2,
                                  s->h_edge_pos, s->v_edge_pos);
         srcY = s->edge_emu_buffer + 2 + 2*s->linesize;
-        s->vdsp.emulated_edge_mc(uvbuf, srcU,
-                                 s->uvlinesize, s->uvlinesize,
-                                 (width << 2) + 1, (height << 2) + 1,
-                                 uvsrc_x, uvsrc_y,
-                                 s->h_edge_pos >> 1, s->v_edge_pos >> 1);
-        s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,
-                                 s->uvlinesize, s->uvlinesize,
-                                 (width << 2) + 1, (height << 2) + 1,
-                                 uvsrc_x, uvsrc_y,
-                                 s->h_edge_pos >> 1, s->v_edge_pos >> 1);
-        srcU = uvbuf;
-        srcV = uvbuf + 16;
+        emu = 1;
     }
     if(!weighted){
         Y = s->dest[0] + xoff      + yoff     *s->linesize;
@@ -766,6 +754,24 @@ static inline void rv34_mc(RV34DecContext *r, const int block_type,
     }
     is16x16 = (block_type != RV34_MB_P_8x8) && (block_type != RV34_MB_P_16x8) && (block_type != RV34_MB_P_8x16);
     qpel_mc[!is16x16][dxy](Y, srcY, s->linesize);
+    if (emu) {
+        uint8_t *uvbuf = s->edge_emu_buffer;
+
+        s->vdsp.emulated_edge_mc(uvbuf, srcU,
+                                 s->uvlinesize, s->uvlinesize,
+                                 (width << 2) + 1, (height << 2) + 1,
+                                 uvsrc_x, uvsrc_y,
+                                 s->h_edge_pos >> 1, s->v_edge_pos >> 1);
+        srcU = uvbuf;
+        uvbuf += 9*s->uvlinesize;
+
+        s->vdsp.emulated_edge_mc(uvbuf, srcV,
+                                 s->uvlinesize, s->uvlinesize,
+                                 (width << 2) + 1, (height << 2) + 1,
+                                 uvsrc_x, uvsrc_y,
+                                 s->h_edge_pos >> 1, s->v_edge_pos >> 1);
+        srcV = uvbuf;
+    }
     chroma_mc[2-width]   (U, srcU, s->uvlinesize, height*4, uvmx, uvmy);
     chroma_mc[2-width]   (V, srcV, s->uvlinesize, height*4, uvmx, uvmy);
 }