H264: use alias-safe macros

This eliminates all aliasing violation warnings in h264 code.
No measurable speed difference with gcc-4.4.3 on i7.

Originally committed as revision 21881 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 18 insertions, 15 deletions

diff --git a/libavcodec/h264_loopfilter.c b/libavcodec/h264_loopfilter.c
index 1e2b044056..7855ba5aaa 100644
--- a/libavcodec/h264_loopfilter.c
+++ b/libavcodec/h264_loopfilter.c
@@ -25,6 +25,7 @@
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 
+#include "libavutil/intreadwrite.h"
 #include "internal.h"
 #include "dsputil.h"
 #include "avcodec.h"
@@ -368,11 +369,13 @@ void ff_h264_filter_mb_fast( H264Context *h, int mb_x, int mb_y, uint8_t *img_y,
         return;
     } else {
         LOCAL_ALIGNED_8(int16_t, bS, [2], [4][4]);
-        uint64_t (*bSv)[4] = (uint64_t(*)[4])bS;
         int edges;
         if( IS_8x8DCT(mb_type) && (h->cbp&7) == 7 ) {
             edges = 4;
-            bSv[0][0] = bSv[0][2] = bSv[1][0] = bSv[1][2] = 0x0002000200020002ULL;
+            AV_WN64A(bS[0][0], 0x0002000200020002ULL);
+            AV_WN64A(bS[0][2], 0x0002000200020002ULL);
+            AV_WN64A(bS[1][0], 0x0002000200020002ULL);
+            AV_WN64A(bS[1][2], 0x0002000200020002ULL);
         } else {
             int mask_edge1 = (3*(((5*mb_type)>>5)&1)) | (mb_type>>4); //(mb_type & (MB_TYPE_16x16 | MB_TYPE_8x16)) ? 3 : (mb_type & MB_TYPE_16x8) ? 1 : 0;
             int mask_edge0 = 3*((mask_edge1>>1) & ((5*left_type)>>5)&1); // (mb_type & (MB_TYPE_16x16 | MB_TYPE_8x16)) && (h->left_type[0] & (MB_TYPE_16x16 | MB_TYPE_8x16)) ? 3 : 0;
@@ -382,12 +385,12 @@ void ff_h264_filter_mb_fast( H264Context *h, int mb_x, int mb_y, uint8_t *img_y,
                                               h->list_count==2, edges, step, mask_edge0, mask_edge1, FIELD_PICTURE);
         }
         if( IS_INTRA(left_type) )
-            bSv[0][0] = 0x0004000400040004ULL;
+            AV_WN64A(bS[0][0], 0x0004000400040004ULL);
         if( IS_INTRA(h->top_type) )
-            bSv[1][0] = FIELD_PICTURE ? 0x0003000300030003ULL : 0x0004000400040004ULL;
+            AV_WN64A(bS[1][0], FIELD_PICTURE ? 0x0003000300030003ULL : 0x0004000400040004ULL);
 
 #define FILTER(hv,dir,edge)\
-        if(bSv[dir][edge]) {\
+        if(AV_RN64A(bS[dir][edge])) {                                   \
             filter_mb_edge##hv( &img_y[4*edge*(dir?linesize:1)], linesize, bS[dir][edge], edge ? qp : qp##dir, h );\
             if(!(edge&1)) {\
                 filter_mb_edgec##hv( &img_cb[2*edge*(dir?uvlinesize:1)], uvlinesize, bS[dir][edge], edge ? qpc : qpc##dir, h );\
@@ -477,7 +480,7 @@ static av_always_inline void filter_mb_dir(H264Context *h, int mb_x, int mb_y, u
                 DECLARE_ALIGNED_8(int16_t, bS)[4];
                 int qp;
                 if( IS_INTRA(mb_type|s->current_picture.mb_type[mbn_xy]) ) {
-                    *(uint64_t*)bS= 0x0003000300030003ULL;
+                    AV_WN64A(bS, 0x0003000300030003ULL);
                 } else {
                     if(!CABAC && IS_8x8DCT(s->current_picture.mb_type[mbn_xy])){
                         bS[0]= 1+((h->cbp_table[mbn_xy] & 4)||h->non_zero_count_cache[scan8[0]+0]);
@@ -508,17 +511,17 @@ static av_always_inline void filter_mb_dir(H264Context *h, int mb_x, int mb_y, u
             int qp;
 
             if( IS_INTRA(mb_type|mbm_type)) {
-                *(uint64_t*)bS= 0x0003000300030003ULL;
+                AV_WN64A(bS, 0x0003000300030003ULL);
                 if (   (!IS_INTERLACED(mb_type|mbm_type))
                     || ((FRAME_MBAFF || (s->picture_structure != PICT_FRAME)) && (dir == 0))
                 )
-                    *(uint64_t*)bS= 0x0004000400040004ULL;
+                    AV_WN64A(bS, 0x0004000400040004ULL);
             } else {
                 int i;
                 int mv_done;
 
                 if( dir && FRAME_MBAFF && IS_INTERLACED(mb_type ^ mbm_type)) {
-                    *(uint64_t*)bS= 0x0001000100010001ULL;
+                    AV_WN64A(bS, 0x0001000100010001ULL);
                     mv_done = 1;
                 }
                 else if( mask_par0 && ((mbm_type & (MB_TYPE_16x16 | (MB_TYPE_8x16 >> dir)))) ) {
@@ -588,13 +591,13 @@ static av_always_inline void filter_mb_dir(H264Context *h, int mb_x, int mb_y, u
             continue;
 
         if( IS_INTRA(mb_type)) {
-            *(uint64_t*)bS= 0x0003000300030003ULL;
+            AV_WN64A(bS, 0x0003000300030003ULL);
         } else {
             int i;
             int mv_done;
 
             if( edge & mask_edge ) {
-                *(uint64_t*)bS= 0;
+                AV_ZERO64(bS);
                 mv_done = 1;
             }
             else if( mask_par0 ) {
@@ -674,10 +677,10 @@ void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint
         int i;
         first_vertical_edge_done = 1;
 
-        if( IS_INTRA(mb_type) )
-            *(uint64_t*)&bS[0]=
-            *(uint64_t*)&bS[4]= 0x0004000400040004ULL;
-        else {
+        if( IS_INTRA(mb_type) ) {
+            AV_WN64A(&bS[0], 0x0004000400040004ULL);
+            AV_WN64A(&bS[4], 0x0004000400040004ULL);
+        } else {
             static const uint8_t offset[2][2][8]={
                 {
                     {7+8*0, 7+8*0, 7+8*0, 7+8*0, 7+8*1, 7+8*1, 7+8*1, 7+8*1},