J'en ai chi� mais j'ai enfin pondu le AddBlock du video_decoder.

diff --git a/include/vdec_idct.h b/include/vdec_idct.h
index 68d10a2b707496437e6fdd6d10842c8265a1412c..ea95b796889267ad70f615456a8d3741dc3eec89 100644 (file)
--- a/include/vdec_idct.h
+++ b/include/vdec_idct.h
@@ -13,16 +13,22 @@
 /*****************************************************************************
  * Common declarations
  *****************************************************************************/ 
-#define elem_t short
+#ifndef VDEC_DFT
+typedef short elem_t;
+#else
+typedef int elem_t;
+#endif
+
+struct vdec_thread_s;
 
 /*****************************************************************************
  * Function pointers
  *****************************************************************************/
-typedef void (*f_idct_t)( elem_t*, int );
+typedef void (*f_idct_t)( struct vdec_thread_s *, elem_t*, int );
 
 /*****************************************************************************
  * Prototypes
  *****************************************************************************/
-void vdec_DummyIDCT( elem_t*, int );
-void vdec_SparseIDCT( elem_t*, int );
-void vdec_IDCT( elem_t*, int );
+void vdec_DummyIDCT( struct vdec_thread_s *, elem_t*, int );
+void vdec_SparseIDCT( struct vdec_thread_s *, elem_t*, int );
+void vdec_IDCT( struct vdec_thread_s *, elem_t*, int );

diff --git a/include/vpar_blocks.h b/include/vpar_blocks.h
index 43f3f9186106c920a0aa41d9733261b0503d5b9a..7d0de8f867bd4970b35b39195680bd9f81208524 100644 (file)
--- a/include/vpar_blocks.h
+++ b/include/vpar_blocks.h
@@ -21,11 +21,13 @@
 typedef struct macroblock_s
 {
     picture_t *             p_picture;
-    int                     i_mb_x, i_mb_y;
     int                     i_structure;
     int                     i_l_x, i_l_y;    /* position of macroblock (lum) */
     int                     i_c_x, i_c_y; /* position of macroblock (chroma) */
     int                     i_chroma_nb_blocks;  /* nb of bks for a chr comp */
+    int                     i_l_stride;           /* number of data_t to ignore
+                                                  * when changing lines     */
+    int                     i_c_stride;                  /* idem, for chroma */
 
     /* IDCT information */
     elem_t                  ppi_blocks[12][64];                    /* blocks */
@@ -47,9 +49,9 @@ typedef struct macroblock_s
     int                     pi_motion_vectors_forw_bot[2];
 
     /* AddBlock information */
-    f_addb_t                pf_addb[12];
-    data_t *                p_data[12];    /* positions of blocks in picture */
-    int                     i_lum_incr, i_chroma_incr;
+    f_addb_t                pf_addb[12];      /* pointer to the Add function */
+    data_t *                p_data[12];              /* pointer to the position
+                                                     * in the final picture */
 } macroblock_t;
 
 /*****************************************************************************
@@ -60,6 +62,8 @@ typedef struct
     int                     i_mb_type, i_motion_type, i_mv_count, i_mv_format;
     int                     i_coded_block_pattern;
     boolean_t               b_dct_type;
+
+    int                     i_l_x, i_l_y, i_c_x, i_c_y;
 } macroblock_parsing_t;
 
 /*****************************************************************************

diff --git a/include/vpar_headers.h b/include/vpar_headers.h
index 18c3d702cde74514d6371745c77cb92afe254574..c80078cec7055331811865a46b9d814e0fc2f29f 100644 (file)
--- a/include/vpar_headers.h
+++ b/include/vpar_headers.h
@@ -42,12 +42,10 @@ extern int *    pi_default_nonintra_quant;
  *****************************************************************************/
 typedef struct sequence_s
 {
-    u32                 i_height, i_width, i_chroma_width, i_size;
+    u32                 i_height, i_width, i_size;
     u32                 i_mb_height, i_mb_width, i_mb_size;
     unsigned int        i_aspect_ratio;
     double              d_frame_rate;
-    unsigned int        i_chroma_format;
-    int                 i_chroma_nb_blocks;
     boolean_t           b_mpeg2;
     boolean_t           b_progressive;
     unsigned int        i_scalable_mode;
@@ -57,6 +55,12 @@ typedef struct sequence_s
     void                (*pf_decode_mv)( struct vpar_thread_s *, int );
     f_chroma_pattern_t  pf_decode_pattern;
 
+    /* Chromatic information */
+    unsigned int        i_chroma_format;
+    int                 i_chroma_nb_blocks;
+    u32                 i_chroma_width;
+    u32                 i_chroma_mb_width, i_chroma_mb_height;
+
     /* Parser context */
     picture_t *         p_forward;
     picture_t *         p_backward;
@@ -85,7 +89,7 @@ typedef struct picture_parsing_s
     boolean_t           b_alternate_scan, b_progressive_frame;
     boolean_t           b_top_field_first, b_concealment_mv;
     boolean_t           b_repeat_first_field;
-    int                 i_lum_incr, i_chroma_incr;
+    int                 i_l_stride, i_c_stride;
 
     /* Used for second field management */
     int                 i_current_structure;

diff --git a/src/video_decoder/video_decoder.c b/src/video_decoder/video_decoder.c
index d6cc79c32b3b1427f7c863d3bba4deedb6745781..8651a8e6b724bca6cc6f0a7c8364346032dd0549 100644 (file)
--- a/src/video_decoder/video_decoder.c
+++ b/src/video_decoder/video_decoder.c
@@ -242,13 +242,14 @@ static void DecodeMacroblock( vdec_thread_t *p_vdec, macroblock_t * p_mb )
         /*
          * Inverse DCT (ISO/IEC 13818-2 section Annex A)
          */
-        (p_mb->pf_idct[i_b])( p_mb->ppi_blocks[i_b], p_mb->pi_sparse_pos[i_b] );
+        (p_mb->pf_idct[i_b])( p_vdec, p_mb->ppi_blocks[i_b],
+                              p_mb->pi_sparse_pos[i_b] );
 
         /*
          * Adding prediction and coefficient data (ISO/IEC 13818-2 section 7.6.8)
          */
         (p_mb->pf_addb[i_b])( p_mb->ppi_blocks[i_b],
-                               p_mb->p_data[i_b], p_mb->i_lum_incr );
+                               p_mb->p_data[i_b], p_mb->i_l_stride );
     }
 
     /* chrominance */
@@ -257,13 +258,14 @@ static void DecodeMacroblock( vdec_thread_t *p_vdec, macroblock_t * p_mb )
         /*
          * Inverse DCT (ISO/IEC 13818-2 section Annex A)
          */
-        (p_mb->pf_idct[i_b])( p_mb->ppi_blocks[i_b], p_mb->pi_sparse_pos[i_b] );
+        (p_mb->pf_idct[i_b])( p_vdec, p_mb->ppi_blocks[i_b],
+                              p_mb->pi_sparse_pos[i_b] );
 
         /*
          * Adding prediction and coefficient data (ISO/IEC 13818-2 section 7.6.8)
          */
         (p_mb->pf_addb[i_b])( p_mb->ppi_blocks[i_b],
-                               p_mb->p_data[i_b], p_mb->i_chroma_incr );
+                               p_mb->p_data[i_b], p_mb->i_c_stride );
     }
 
     /*

diff --git a/src/video_parser/vpar_blocks.c b/src/video_parser/vpar_blocks.c
index 3fc7ae6b2e6f3b621df5ff53dd212b9ad3a69f7c..0ba2e0a30b9130bb48c6a32915b9a06dd8c1bf33 100644 (file)
--- a/src/video_parser/vpar_blocks.c
+++ b/src/video_parser/vpar_blocks.c
@@ -43,7 +43,7 @@
  * Local prototypes
  */
 static __inline__ void InitMacroblock( vpar_thread_t * p_vpar,
-                                       macroblock_t * p_mb, int i_mb_address );
+                                       macroblock_t * p_mb );
 static __inline__ int MacroblockAddressIncrement( vpar_thread_t * p_vpar );
 static __inline__ void MacroblockModes( vpar_thread_t * p_vpar,
                                         macroblock_t * p_mb );
@@ -61,10 +61,20 @@ void vpar_ParseMacroblock( vpar_thread_t * p_vpar, int * pi_mb_address,
                            int i_mb_previous, int i_mb_base )
 {
     static f_addb_t ppf_addb_intra[2] = {vdec_AddBlock, vdec_CopyBlock};
+    static f_decode_block_t pppf_decode_block[2][2] =
+                { {vpar_DecodeMPEG1Non, vpar_DecodeMPEG1Intra},
+                  {vpar_DecodeMPEG2Non, vpar_DecodeMPEG2Intra} };
+    static int      pi_x[12] = {0,8,0,8,0,0,0,0,8,8,8,8};
+    static int      pi_y[2][12] = { {0,0,8,8,0,0,8,8,0,0,8,8},
+                                    {0,0,1,1,0,0,1,1,0,0,1,1} };
+    static int      pi_chroma_hor[4] = { 0, 1, 1, 0 };
+    static int      pi_chroma_ver[4] = { 0, 1, 0, 0 };
 
-    int             i_mb, i_b, i_mask, i_x, i_y, pi_pos[3], pi_width[3];
+    int             i_mb, i_b, i_mask;
     macroblock_t *  p_mb;
     f_addb_t        pf_addb;
+    elem_t *        p_data1;
+    elem_t *        p_data2;
 
     *pi_mb_address += MacroblockAddressIncrement( p_vpar );
 
@@ -94,7 +104,7 @@ void vpar_ParseMacroblock( vpar_thread_t * p_vpar, int * pi_mb_address,
             return;
         }
 
-        InitMacroblock( p_vpar, p_mb, i_mb );
+        InitMacroblock( p_vpar, p_mb );
 
         /* No IDCT nor AddBlock. */
         for( i_b = 0; i_b < 12; i_b++ )
@@ -119,7 +129,7 @@ void vpar_ParseMacroblock( vpar_thread_t * p_vpar, int * pi_mb_address,
         return;
     }
 
-    InitMacroblock( p_vpar, p_mb, *pi_mb_address );
+    InitMacroblock( p_vpar, p_mb );
 
     /* Parse off macroblock_modes structure. */
     MacroblockModes( p_vpar, p_mb );
@@ -158,44 +168,59 @@ void vpar_ParseMacroblock( vpar_thread_t * p_vpar, int * pi_mb_address,
 
     pf_addb = ppf_addb_intra[p_vpar->mb.i_mb_type & MB_INTRA];
 
-    /* C'est de la merde, il faut recommencer */
-
-    i_x = p_mb->i_mb_x << 4;
-    i_y = p_mb->i_mb_y << 4;
-
-    pi_pos[0] = i_y*(p_vpar->sequence.i_width
-                        << (!p_vpar->picture.b_frame_structure))
-                + (p_mb->i_structure == BOTTOM_FIELD)*p_vpar->sequence.i_width
-                + i_x;
-    pi_pos[1] = pi_pos[2] = i_y*(p_vpar->sequence.i_chroma_width
-                        << (!p_vpar->picture.b_frame_structure))
-                + (p_mb->i_structure == BOTTOM_FIELD)*p_vpar->sequence.i_chroma_width
-                + (i_x >> (3-p_vpar->sequence.i_chroma_format));
-    pi_width[0] = p_vpar->sequence.i_width << (!p_vpar->picture.b_frame_structure
-                                               || p_vpar->mb.b_dct_type);
-    pi_width[1] = pi_width[2] = p_vpar->sequence.i_chroma_width
-                << (!p_vpar->picture.b_frame_structure || p_vpar->mb.b_dct_type);
-
-    /* Effectively decode blocks. */
-    for( i_b = 0, i_mask = 1 << (3 + 2*p_vpar->sequence.i_chroma_nb_blocks);
-         i_b < 4 + 2*p_vpar->sequence.i_chroma_nb_blocks; i_b++, i_mask >>= 1 )
+    /*
+     * Effectively decode blocks.
+     */
+
+    i_mask = 1 << (3 + 2*p_vpar->sequence.i_chroma_nb_blocks);
+
+    /* luminance */
+    p_data1 = p_mb->p_picture->p_y
+              + p_mb->i_l_x + p_mb->i_l_y*(p_vpar->sequence.i_width);
+
+    for( i_b = 0; i_b < 4; i_b++, i_mask >>= 1 )
     {
         if( p_vpar->mb.i_coded_block_pattern & i_mask )
         {
-            static f_decode_block_t pppf_decode_block[2][2] =
-                { {vpar_DecodeMPEG1Non, vpar_DecodeMPEG1Intra},
-                  {vpar_DecodeMPEG2Non, vpar_DecodeMPEG2Intra} };
-            static int              pi_x[12] = {0,8,0,8,0,0,0,0,8,8,8,8};
-            static int              pi_y[12] = {0,0,8,8,0,0,8,8,0,0,8,8};
-            data_t                  pi_data[12] =
-                {p_mb->p_picture->p_y, p_mb->p_picture->p_y,
-                 p_mb->p_picture->p_y, p_mb->p_picture->p_y,
-                 p_mb->p_picture->p_u, p_mb->p_picture->p_v,
-                 p_mb->p_picture->p_u, p_mb->p_picture->p_v,
-                 p_mb->p_picture->p_u, p_mb->p_picture->p_v,
-                 p_mb->p_picture->p_u, p_mb->p_picture->p_v};
-
-            bzero( p_mb->ppi_blocks[i_b], 64*sizeof(elem_t) );
+            memset( p_mb->ppi_blocks[i_b], 0, 64*sizeof(elem_t) );
+            (*pppf_decode_block[p_vpar->sequence.b_mpeg2]
+                               [p_vpar->mb.i_mb_type & MB_INTRA])
+                ( p_vpar, p_mb, i_b );
+        
+            /* decode_block has already set pf_idct and pi_sparse_pos. */
+            p_mb->pf_addb[i_b] = pf_addb;
+     
+            /* Calculate block coordinates. */
+            p_mb->p_data[i_b] = p_data1
+                                 + pi_y[p_vpar->mb.b_dct_type][i_b]
+                                   * p_vpar->sequence.i_chroma_width;
+        }
+        else
+        {
+            /* Block not coded, so no IDCT, nor AddBlock */
+            p_mb->pf_addb[i_b] = vdec_DummyBlock;
+            p_mb->pf_idct[i_b] = vdec_DummyIDCT;
+        }
+    }
+
+    /* chrominance U */
+    p_data1 = p_mb->p_picture->p_u
+              + p_mb->i_c_x >> pi_chroma_hor[p_vpar->sequence.i_chroma_format]
+              + (p_mb->i_c_y >> pi_chroma_ver[p_vpar->sequence.i_chroma_format])
+                * (p_vpar->sequence.i_chroma_width);
+    p_data2 = p_mb->p_picture->p_v
+              + p_mb->i_c_x >> pi_chroma_hor[p_vpar->sequence.i_chroma_format]
+              + (p_mb->i_c_y >> pi_chroma_ver[p_vpar->sequence.i_chroma_format])
+                * (p_vpar->sequence.i_chroma_width);
+
+    for( i_b = 4; i_b < 4 + 2*p_vpar->sequence.i_chroma_nb_blocks;
+         i_b++, i_mask >>= 1 )
+    {
+        elem_t *    pp_data[2] = {p_data1, p_data2};
+
+        if( p_vpar->mb.i_coded_block_pattern & i_mask )
+        {
+            memset( p_mb->ppi_blocks[i_b], 0, 64*sizeof(elem_t) );
             (*pppf_decode_block[p_vpar->sequence.b_mpeg2]
                                [p_vpar->mb.i_mb_type & MB_INTRA])
                 ( p_vpar, p_mb, i_b );
@@ -204,10 +229,9 @@ void vpar_ParseMacroblock( vpar_thread_t * p_vpar, int * pi_mb_address,
             p_mb->pf_addb[i_b] = pf_addb;
 
             /* Calculate block coordinates. */
-            p_mb->p_data[i_b] = pi_data[i_b] + pi_pos[i_b >> 2]
-                    + pi_y[i_b]*pi_width[i_b >> 2]
-                    + (p_vpar->mb.b_dct_type & ((i_b & 2) >> 1));
-                    /* INACHEVÉ parce que trop pourri ! */
+            p_mb->p_data[i_b] = pp_data[i_b & 1]
+                                 + pi_y[p_vpar->mb.b_dct_type][i_b]
+                                   * p_vpar->sequence.i_chroma_width;
         }
         else
         {
@@ -248,16 +272,30 @@ void vpar_ParseMacroblock( vpar_thread_t * p_vpar, int * pi_mb_address,
  * InitMacroblock : Initialize macroblock values
  *****************************************************************************/
 static __inline__ void InitMacroblock( vpar_thread_t * p_vpar,
-                                       macroblock_t * p_mb, int i_mb_address )
+                                       macroblock_t * p_mb )
 {
     p_mb->p_picture = p_vpar->picture.p_picture;
     p_mb->i_structure = p_vpar->picture.i_structure;
-    p_mb->i_mb_x = i_mb_address % p_vpar->sequence.i_mb_width;
-    p_mb->i_mb_y = i_mb_address / p_vpar->sequence.i_mb_width;
+    p_mb->i_l_x = p_vpar->mb.i_l_x;
+    p_mb->i_l_y = p_vpar->mb.i_l_y;
+    p_mb->i_c_x = p_vpar->mb.i_c_x;
+    p_mb->i_c_y = p_vpar->mb.i_c_y;
     p_mb->i_chroma_nb_blocks = p_vpar->sequence.i_chroma_nb_blocks;
 
-    p_mb->i_lum_incr = p_vpar->picture.i_lum_incr;
-    p_mb->i_chroma_incr = p_vpar->picture.i_chroma_incr;
+    p_mb->i_l_stride = p_vpar->picture.i_l_stride;
+    p_mb->i_c_stride = p_vpar->picture.i_c_stride;
+
+    /* Update macroblock real position. */
+    p_vpar->mb.i_l_x += 16;
+    p_vpar->mb.i_l_y += (p_vpar->mb.i_l_x / p_vpar->sequence.i_width)
+                        * (2 - p_vpar->picture.b_frame_structure) * 16;
+    p_vpar->mb.i_l_x %= p_vpar->sequence.i_width;
+
+    p_vpar->mb.i_c_x += p_vpar->sequence.i_chroma_mb_width;
+    p_vpar->mb.i_c_y += (p_vpar->mb.i_c_x / p_vpar->sequence.i_chroma_width)
+                        * (2 - p_vpar->picture.b_frame_structure)
+                        * p_vpar->sequence.i_chroma_mb_height;
+    p_vpar->mb.i_c_x %= p_vpar->sequence.i_chroma_width;
 }
 
 /*****************************************************************************
@@ -288,7 +326,7 @@ static __inline__ void MacroblockModes( vpar_thread_t * p_vpar,
      * has to be dropped, take care if you use scalable streams. */
     /* DumpBits( &p_vpar->bit_stream, 2 ); */
     
-    if( !(p_vpar->mb.i_mb_type & (MB_MOTION_FORWARD || MB_MOTION_BACKWARD))
+    if( !(p_vpar->mb.i_mb_type & (MB_MOTION_FORWARD | MB_MOTION_BACKWARD))
         || p_vpar->picture.b_frame_pred_frame_dct )
     {
         /* If mb_type has neither MOTION_FORWARD nor MOTION_BACKWARD, this
@@ -307,15 +345,18 @@ static __inline__ void MacroblockModes( vpar_thread_t * p_vpar,
     p_vpar->mb.i_mv_format = ppi_mv_format[p_vpar->picture.b_frame_structure]
                                           [p_vpar->mb.i_motion_type];
 
+    p_vpar->mb.b_dct_type = 0;
     if( (p_vpar->picture.i_structure == FRAME_STRUCTURE) &&
         (!p_vpar->picture.b_frame_pred_frame_dct) &&
         (p_vpar->mb.i_mb_type & (MB_PATTERN|MB_INTRA)) )
     {
-        p_vpar->mb.b_dct_type = GetBits( &p_vpar->bit_stream, 1 );
-    }
-    else
-    {
-        p_vpar->mb.b_dct_type = 0;
+        if( p_vpar->mb.b_dct_type = GetBits( &p_vpar->bit_stream, 1 ) )
+        {
+            p_mb->i_l_stride <<= 1;
+           p_mb->i_l_stride += 8;
+           p_mb->i_c_stride <<= 1;
+           p_mb->i_c_stride += 8;
+        }
     }
 }
 

diff --git a/src/video_parser/vpar_headers.c b/src/video_parser/vpar_headers.c
index 5104f27fb0ff584620c624ef16f926cb6a65722b..409a9683f0849a5d68edade20719f243930b23db 100644 (file)
--- a/src/video_parser/vpar_headers.c
+++ b/src/video_parser/vpar_headers.c
@@ -219,7 +219,6 @@ static void SequenceHeader( vpar_thread_t * p_vpar )
     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
     {
         int                         i_dummy;
-        static int                  pi_chroma_nb_blocks[4] = {0, 1, 2, 4};
         static f_chroma_pattern_t   ppf_chroma_pattern[4] =
                             {NULL, vpar_CodedPattern420,
                              vpar_CodedPattern422, vpar_CodedPattern444};
@@ -230,10 +229,6 @@ static void SequenceHeader( vpar_thread_t * p_vpar )
         DumpBits( &p_vpar->bit_stream, 12 );
         p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
         p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
-        p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width
-                    >> (3-p_vpar->sequence.i_chroma_format);
-        p_vpar->sequence.i_chroma_nb_blocks = pi_chroma_nb_blocks
-                                    [p_vpar->sequence.i_chroma_format];
         p_vpar->sequence.pf_decode_pattern = ppf_chroma_pattern
                                     [p_vpar->sequence.i_chroma_format];
         p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
@@ -253,13 +248,12 @@ static void SequenceHeader( vpar_thread_t * p_vpar )
         /* It's an MPEG-1 stream. Put adequate parameters. */
         p_vpar->sequence.b_progressive = 1;
         p_vpar->sequence.i_chroma_format = CHROMA_420;
-        p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 2;
-        p_vpar->sequence.i_chroma_nb_blocks = 2;
         p_vpar->sequence.pf_decode_pattern = vpar_CodedPattern420;
 
         p_vpar->sequence.pf_decode_mv = vpar_MPEG1MotionVector;
     }
 
+    /* Update sizes */
     p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
     p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
                                    (p_vpar->sequence.i_height + 15) / 16 :
@@ -271,6 +265,30 @@ static void SequenceHeader( vpar_thread_t * p_vpar )
     p_vpar->sequence.i_size = p_vpar->sequence.i_width
                                         * p_vpar->sequence.i_height;
 
+    /* Update chromatic information */
+    switch( p_vpar->sequence.i_chroma_format )
+    {
+    case CHROMA_420:
+        p_vpar->sequence.i_chroma_nb_blocks = 2;
+        p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 2;
+        p_vpar->i_chroma_mb_width = 8;
+        p_vpar->i_chroma_mb_height = 8;
+        break;
+
+    case CHROMA_422:
+        p_vpar->sequence.i_chroma_nb_blocks = 4;
+        p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
+        p_vpar->i_chroma_mb_width = 8;
+        p_vpar->i_chroma_mb_height = 16;
+        break;
+
+    case CHROMA_444:
+        p_vpar->sequence.i_chroma_nb_blocks = 8;
+        p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width;
+        p_vpar->i_chroma_mb_width = 16;
+        p_vpar->i_chroma_mb_height = 16;
+    }
+
     /* Slice Header functions */
     if( p_vpar->sequence.i_height <= 2800 )
     {
@@ -481,10 +499,10 @@ static void PictureHeader( vpar_thread_t * p_vpar )
         P_picture->date = vpar_SynchroDecode( p_vpar,
                                               p_vpar->picture.i_coding_type,
                                               i_structure );
-        p_vpar->picture.i_lum_incr = - 8 + ( p_vpar->sequence.i_width
-                    << ( i_structure != FRAME_STRUCTURE ) );
-        p_vpar->picture.i_chroma_incr = -8 + ( p_vpar->sequence.i_width
-                    << (( i_structure != FRAME_STRUCTURE ) +
+        p_vpar->picture.i_l_stride = - 8 + ( p_vpar->sequence.i_width
+                    << ( 1 - p_vpar->picture.b_frame_structure ) );
+        p_vpar->picture.i_c_stride = -8 + ( p_vpar->sequence.i_width
+                    << (( 1 - p_vpar->picture.b_frame_structure ) +
                         ( 3 - p_vpar->sequence.i_chroma_format )) );
 
         /* Update the reference pointers. */
@@ -498,12 +516,16 @@ static void PictureHeader( vpar_thread_t * p_vpar )
     if( i_structure == BOTTOM_FIELD )
     {
         i_mb_base = p_vpar->sequence.i_mb_size >> 1;
+        p_vpar->mb.i_l_y = 16;
+        p_vpar->mb.i_c_y = p_vpar->sequence.i_chroma_mb_height;
     }
     else
     {
         i_mb_base = 0;
+        p_vpar->mb.i_l_y = p_vpar->mb.i_c_y = 0;
     }
     i_mb_address = 0;
+    p_vpar->mb.i_l_x = p_vpar->mb.i_c_x = 0;
 
     /* Extension and User data. */
     ExtensionAndUserData( p_vpar );
@@ -924,7 +946,7 @@ static __inline__ void LoadMatrix( vpar_thread_t * p_vpar, quant_matrix_t * p_ma
              = GetBits( &p_vpar->bit_stream, 8 );
     }
 
-#ifdef FOURIER_IDCT
+#ifdef VDEC_DFT
     /* Discrete Fourier Transform requires the quantization matrices to
      * be normalized before using them. */
     vdec_NormQuantMatrix( p_matrix->pi_matrix );