some fixes (still buggy though)

Originally committed as revision 2191 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, 11);
+        block[0]= get_sbits(&a->gb, 10);
     }else{
         component = (n <= 3 ? 0 : n - 4 + 1);
         diff = decode_dc(&a->gb, component);
@@ -96,12 +96,7 @@ static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
                 /* escape */
                 run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
                 UPDATE_CACHE(re, &a->gb);
-                level = SHOW_SBITS(re, &a->gb, 8); SKIP_BITS(re, &a->gb, 8);
-                if (level == -128) {
-                    level = SHOW_UBITS(re, &a->gb, 8) - 256; LAST_SKIP_BITS(re, &a->gb, 8);
-                } else if (level == 0) {
-                    level = SHOW_UBITS(re, &a->gb, 8)      ; LAST_SKIP_BITS(re, &a->gb, 8);
-                }
+                level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
                 i += run;
                 j = scantable[i];
 /*                if(level<0){
@@ -193,7 +188,6 @@ static int decode_frame(AVCodecContext *avctx,
         a->bitstream_buffer[i]  = buf[i+1];
         a->bitstream_buffer[i+1]= buf[i  ];
     }
-//    a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (uint32_t*)buf, buf_size/4);
     init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
     
     /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
@@ -201,12 +195,11 @@ static int decode_frame(AVCodecContext *avctx,
 
     a->qscale=  get_bits(&a->gb, 16);
     a->version= get_bits(&a->gb, 16);
-    skip_bits(&a->gb, 8*8); 
     
     printf("qscale:%d (0x%X), version:%d (0x%X)\n", a->qscale, a->qscale, a->version, a->version);
     
-    for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){
     for(a->mb_x=0; a->mb_x<a->mb_width; a->mb_x++){
+        for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){
             if( decode_mb(a, a->block) <0)
                 return -1;
              
@@ -214,18 +207,6 @@ static int decode_frame(AVCodecContext *avctx,
         }
     }
 
-#if 0    
-int i;
-printf("%d %d\n", 8*buf_size, get_bits_count(&a->gb));
-for(i=get_bits_count(&a->gb); i<8*buf_size; i++){
-    printf("%d", get_bits1(&a->gb));
-}
-
-for(i=0; i<s->avctx->extradata_size; i++){
-    printf("%c\n", ((uint8_t*)s->avctx->extradata)[i]);
-}
-#endif
-
 //    p->quality= (32 + a->inv_qscale/2)/a->inv_qscale;
 //    memset(p->qscale_table, p->quality, p->qstride*a->mb_height);