git.sesse.net Git - vlc/blob - include/vpar_blocks.h

   1 /*****************************************************************************
   2  * vpar_blocks.h : video parser blocks management
   3  * (c)1999 VideoLAN
   4  *****************************************************************************
   5  *****************************************************************************
   6  * Requires:
   7  *  "config.h"
   8  *  "common.h"
   9  *  "mtime.h"
  10  *  "vlc_thread.h"
  11  *  "input.h"
  12  *  "video.h"
  13  *  "video_output.h"
  14  *  "decoder_fifo.h"
  15  *  "video_fifo.h"
  16  *****************************************************************************/
  17
  18 /*****************************************************************************
  19  * macroblock_t : information on a macroblock
  20  *****************************************************************************/
  21 typedef struct macroblock_s
  22 {
  23     picture_t *             p_picture;
  24     int                     i_mb_x, i_mb_y;
  25     int                     i_structure;
  26     int                     i_l_x, i_l_y;    /* position of macroblock (lum) */
  27     int                     i_c_x, i_c_y; /* position of macroblock (chroma) */
  28     int                     i_structure;
  29     int                     i_chroma_nb_blocks;  /* nb of bks for a chr comp */
  30
  31     /* IDCT information */
  32     elem_t                  ppi_blocks[12][64];                    /* blocks */
  33     f_idct_t                pf_idct[12];             /* sparse IDCT or not ? */
  34     int                     pi_sparse_pos[12];
  35
  36     /* Motion compensation information */
  37     f_motion_t              pf_motion;    /* function to use for motion comp */
  38     f_chroma_motion_t       pf_chroma_motion;
  39     picture_t *             p_backw_top, p_backw_bot;
  40     picture_t *             p_forw_top, p_forw_bot;
  41     int                     i_field_select_backw_top, i_field_select_backw_bot;
  42     int                     i_field_select_forw_top, i_field_select_forw_bot;
  43     int                     pi_motion_vectors_backw_top[2];
  44     int                     pi_motion_vectors_backw_bot[2];
  45     int                     pi_motion_vectors_forw_top[2];
  46     int                     pi_motion_vectors_forw_bot[2];
  47
  48     /* AddBlock information */
  49     f_addb_t                pf_addb[12];
  50     data_t *                p_data[12];    /* positions of blocks in picture */
  51     int                     i_lum_incr, i_chroma_incr;
  52 } macroblock_t;
  53
  54 /*****************************************************************************
  55  * macroblock_parsing_t : parser context descriptor #3
  56  *****************************************************************************/
  57 typedef struct
  58 {
  59     int                     i_mb_type, i_motion_type, i_mv_count, i_mv_format;
  60     int                     i_coded_block_pattern;
  61     boolean_t               b_dct_type;
  62 } macroblock_parsing_t;
  63
  64 /*****************************************************************************
  65  * LoadQuantizerScale
  66  *****************************************************************************
  67  * Quantizer scale factor (ISO/IEC 13818-2 7.4.2.2)
  68  *****************************************************************************/
  69 static __inline__ void LoadQuantizerScale( vpar_thread_t * p_vpar )
  70 {
  71     /* Quantization coefficient table */
  72     static unsigned char    ppi_quantizer_scale[3][32] =
  73     {
  74         /* MPEG-2 */
  75         {
  76             /* q_scale_type */
  77             /* linear */
  78             0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,
  79             32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62
  80         },
  81         {
  82             /* non-linear */
  83             0, 1, 2, 3, 4, 5, 6, 7, 8, 10,12,14,16,18,20, 22,
  84             24,28,32,36,40,44,48,52,56,64,72,80,88,96,104,112
  85         },
  86         /* MPEG-1 */
  87         {
  88             0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
  89             16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
  90         }
  91     };
  92
  93     p_vpar->slice.i_quantizer_scale = ppi_quantizer_scale
  94            [(!p_vpar->sequence.b_mpeg2 << 1) | p_vpar->picture.b_q_scale_type]
  95            [GetBits( &p_vpar->bit_stream, 5 )];
  96 }
  97
  98 /*****************************************************************************
  99  * Standard codes
 100  *****************************************************************************/
 101 /* Macroblock types */
 102 #define MB_INTRA                        1
 103 #define MB_PATTERN                      2
 104 #define MB_MOTION_BACKWARD              4
 105 #define MB_MOTION_FORWARD               8
 106 #define MB_QUANT                        16
 107
 108 /* Motion types */
 109 #define MOTION_FIELD                    1
 110 #define MOTION_FRAME                    2
 111 #define MOTION_16X8                     2
 112 #define MOTION_DMV                      3