more fixes

Originally committed as revision 2192 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mdec.c

@@ -65,7 +65,7 @@ static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
 
     /* DC coef */
     if(a->version==2){
-        block[0]= get_sbits(&a->gb, 10);
+        block[0]= 2*get_sbits(&a->gb, 10) + 1024;
     }else{
         component = (n <= 3 ? 0 : n - 4 + 1);
         diff = decode_dc(&a->gb, component);
@@ -89,7 +89,7 @@ static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
                 i += run;
                 j = scantable[i];
                 level= (level*qscale*quant_matrix[j])>>3;
-                level= (level-1)|1;
+//                level= (level-1)|1;
                 level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
                 LAST_SKIP_BITS(re, &a->gb, 1);
             } else {
@@ -99,15 +99,15 @@ static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
                 level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
                 i += run;
                 j = scantable[i];
-/*                if(level<0){
+                if(level<0){
                     level= -level;
-                    level= (level*qscale*quant_matrix[j])>>4;
+                    level= (level*qscale*quant_matrix[j])>>3;
                     level= (level-1)|1;
                     level= -level;
-                }else{*/
-                    level= (level*qscale*quant_matrix[j])>>4;
-/*                    level= (level-1)|1;
-                }*/
+                }else{
+                    level= (level*qscale*quant_matrix[j])>>3;
+                    level= (level-1)|1;
+                }
             }
             if (i > 63){
                 fprintf(stderr, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
@@ -124,11 +124,12 @@ static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
 
 static inline int decode_mb(MDECContext *a, DCTELEM block[6][64]){
     int i;
+    const int block_index[6]= {5,6,0,1,2,3};
 
     a->dsp.clear_blocks(block[0]);
     
-    for(i=5; i>=0; i--){
-        if( mdec_decode_block_intra(a, block[i], i) < 0) 
+    for(i=0; i<6; i++){
+        if( mdec_decode_block_intra(a, block[ block_index[i] ], block_index[i]) < 0) 
             return -1;
     }
     return 0;