use dc tables from msmpeg4 instead of duplicating them patch by anonymous

[ffmpeg] / libavcodec / mdec.c

diff --git a/libavcodec/mdec.c b/libavcodec/mdec.c
index ea6fe92e9b84fd0b046e10ace6d38bc65239865c..a71f050cdecc8ec95cf86181ff55b1ed6bea41c1 100644 (file)
--- a/libavcodec/mdec.c
+++ b/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 {
@@ -99,18 +99,18 @@ 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);
+                av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
                 return -1;
             }
 
@@ -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]= {5,4,0,1,2,3};
 
     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;
@@ -162,19 +163,12 @@ static int decode_frame(AVCodecContext *avctx,
     AVFrame * const p= (AVFrame*)&a->picture;
     int i;
 
-    *data_size = 0;
-
-    /* special case for last picture */
-    if (buf_size == 0) {
-        return 0;
-    }
-
     if(p->data[0])
         avctx->release_buffer(avctx, p);
 
     p->reference= 0;
     if(avctx->get_buffer(avctx, p) < 0){
-        fprintf(stderr, "get_buffer() failed\n");
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
     p->pict_type= I_TYPE;
@@ -196,7 +190,7 @@ static int decode_frame(AVCodecContext *avctx,
     a->qscale=  get_bits(&a->gb, 16);
     a->version= get_bits(&a->gb, 16);
     
-    printf("qscale:%d (0x%X), version:%d (0x%X)\n", a->qscale, a->qscale, a->version, a->version);
+//    printf("qscale:%d (0x%X), version:%d (0x%X)\n", a->qscale, a->qscale, a->version, a->version);
     
     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++){
@@ -223,8 +217,8 @@ static void mdec_common_init(AVCodecContext *avctx){
 
     dsputil_init(&a->dsp, avctx);
 
-    a->mb_width   = (avctx->width  + 15) / 16;
-    a->mb_height  = (avctx->height + 15) / 16;
+    a->mb_width   = (avctx->coded_width  + 15) / 16;
+    a->mb_height  = (avctx->coded_height + 15) / 16;
 
     avctx->coded_frame= (AVFrame*)&a->picture;
     a->avctx= avctx;
@@ -256,8 +250,6 @@ static int decode_end(AVCodecContext *avctx){
     av_freep(&a->picture.qscale_table);
     a->bitstream_buffer_size=0;
     
-    avcodec_default_free_buffers(avctx);
-
     return 0;
 }