bugs found by valgrind

Originally committed as revision 4841 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/snow.c

@@ -3116,13 +3116,14 @@ static int get_block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index, con
             BlockNode *top   = y ? &s->block[index-b_stride] : &null_block;
             BlockNode *tl    = y && x ? &s->block[index-b_stride-1] : left;
             BlockNode *tr    = y && x+1<b_stride ? &s->block[index-b_stride+1] : tl;
-            int dmx= b->mx - mid_pred(left->mx, top->mx, tr->mx);
-            int dmy= b->my - mid_pred(left->my, top->my, tr->my);
+            int dmx, dmy;
 //        int mx_context= av_log2(2*ABS(left->mx - top->mx));
 //        int my_context= av_log2(2*ABS(left->my - top->my));
 
             if(x<0 || x>=b_stride || y>=b_height)
                 continue;
+            dmx= b->mx - mid_pred(left->mx, top->mx, tr->mx);
+            dmy= b->my - mid_pred(left->my, top->my, tr->my);
 /*
 1            0      0
 01X          1-2    1
@@ -3206,14 +3207,14 @@ static void iterative_me(SnowContext *s){
                 BlockNode backup;
                 const int index= mb_x + mb_y * b_stride;
                 BlockNode *block= &s->block[index];
-                BlockNode *tb =                 mb_y          ? &s->block[index-b_stride  ] : &null_block;
-                BlockNode *lb = mb_x                          ? &s->block[index         -1] : &null_block;
-                BlockNode *rb = mb_x<b_width                  ? &s->block[index         +1] : &null_block;
-                BlockNode *bb =                 mb_y<b_height ? &s->block[index+b_stride  ] : &null_block;
-                BlockNode *tlb= mb_x         && mb_y          ? &s->block[index-b_stride-1] : &null_block;
-                BlockNode *trb= mb_x<b_width && mb_y          ? &s->block[index-b_stride+1] : &null_block;
-                BlockNode *blb= mb_x         && mb_y<b_height ? &s->block[index+b_stride-1] : &null_block;
-                BlockNode *brb= mb_x<b_width && mb_y<b_height ? &s->block[index+b_stride+1] : &null_block;
+                BlockNode *tb =                   mb_y            ? &s->block[index-b_stride  ] : &null_block;
+                BlockNode *lb = mb_x                              ? &s->block[index         -1] : &null_block;
+                BlockNode *rb = mb_x+1<b_width                    ? &s->block[index         +1] : &null_block;
+                BlockNode *bb =                   mb_y+1<b_height ? &s->block[index+b_stride  ] : &null_block;
+                BlockNode *tlb= mb_x           && mb_y            ? &s->block[index-b_stride-1] : &null_block;
+                BlockNode *trb= mb_x+1<b_width && mb_y            ? &s->block[index-b_stride+1] : &null_block;
+                BlockNode *blb= mb_x           && mb_y+1<b_height ? &s->block[index+b_stride-1] : &null_block;
+                BlockNode *brb= mb_x+1<b_width && mb_y+1<b_height ? &s->block[index+b_stride+1] : &null_block;
                 const int b_w= (MB_SIZE >> s->block_max_depth);
                 uint8_t obmc_edged[b_w*2][b_w*2];
 

tests/ffmpeg.regression.ref

@@ -119,9 +119,9 @@ a7ef4746f27be309138c188e327d3ebe *./data/a-ffv1.avi
 2653642 ./data/a-ffv1.avi
 799d3db687f6cdd7a837ec156efc171f *./data/out.yuv
 stddev:  0.00 PSNR:99.99 bytes:7602176
-14fa515bf25a47fc2ad3d18b726e8e31 *./data/a-snow.avi
-1197138 ./data/a-snow.avi
-e7c746171b092266b0cf55bb5de2a40a *./data/out.yuv
+97c7066617d9e6c86a43a2736b3e9f16 *./data/a-snow.avi
+1190760 ./data/a-snow.avi
+7e4d9c61252ff22b1a0d4e892cc1d957 *./data/out.yuv
 stddev:  2.89 PSNR:38.87 bytes:7602176
 11fd61ee7e67ef7a7b2a3df973691305 *./data/a-snow53.avi
 3533710 ./data/a-snow53.avi

tests/rotozoom.regression.ref

@@ -119,9 +119,9 @@ d0831a8339491fd680b650f05262e5d9 *./data/a-ffv1.avi
 3524768 ./data/a-ffv1.avi
 dde5895817ad9d219f79a52d0bdfb001 *./data/out.yuv
 stddev:  0.00 PSNR:99.99 bytes:7602176
-b926518ac399c7af0f218a7115315b4f *./data/a-snow.avi
-286800 ./data/a-snow.avi
-6c59db71d950610f854d05e2cef18609 *./data/out.yuv
+7345af7da71320bf87d3c950252b4341 *./data/a-snow.avi
+286798 ./data/a-snow.avi
+cc5ef1eda02091fbf9a85887bad47bc4 *./data/out.yuv
 stddev:  2.32 PSNR:40.80 bytes:7602176
 3f20642bb789dfb75ae3e8c03f9b425c *./data/a-snow53.avi
 2725570 ./data/a-snow53.avi