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

   1 /*****************************************************************************
   2  * video_parser.h : video parser thread
   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  *  "vpar_headers.h"
  17  *****************************************************************************/
  18
  19 /*****************************************************************************
  20  * video_fifo_t
  21  *****************************************************************************
  22  * This rotative FIFO contains undecoded macroblocks that are to be decoded
  23  *****************************************************************************/
  24 struct vpar_thread_s;
  25
  26 typedef struct video_fifo_s
  27 {
  28 #ifdef VDEC_SMP
  29     vlc_mutex_t         lock;                              /* fifo data lock */
  30     vlc_cond_t          wait;              /* fifo data conditional variable */
  31
  32     /* buffer is an array of undec_picture_t pointers */
  33     macroblock_t *      buffer[VFIFO_SIZE + 1];
  34     int                 i_start;
  35     int                 i_end;
  36 #else
  37     macroblock_t        buffer;
  38 #endif
  39
  40     struct vpar_thread_s *      p_vpar;
  41 } video_fifo_t;
  42
  43 /*****************************************************************************
  44  * video_buffer_t
  45  *****************************************************************************
  46  * This structure enables the parser to maintain a list of free
  47  * macroblock_t structures
  48  *****************************************************************************/
  49 #ifdef VDEC_SMP
  50 typedef struct video_buffer_s
  51 {
  52     vlc_mutex_t         lock;                            /* buffer data lock */
  53
  54     macroblock_t        p_macroblocks[VFIFO_SIZE + 1];
  55     macroblock_t *      pp_mb_free[VFIFO_SIZE+1];          /* this is a LIFO */
  56     int                 i_index;
  57 } video_buffer_t;
  58 #endif
  59
  60 /*****************************************************************************
  61  * vpar_thread_t: video parser thread descriptor
  62  *****************************************************************************
  63  * ??
  64  *****************************************************************************/
  65 typedef struct vpar_thread_s
  66 {
  67     /* Thread properties and locks */
  68     boolean_t           b_die;                                 /* `die' flag */
  69     boolean_t           b_run;                                 /* `run' flag */
  70     boolean_t           b_error;                             /* `error' flag */
  71     boolean_t           b_active;                           /* `active' flag */
  72     vlc_thread_t        thread_id;                /* id for thread functions */
  73
  74     /* Thread configuration */
  75     /* ?? */
  76  /*??*/
  77 //    int *pi_status;
  78
  79
  80     /* Input properties */
  81     decoder_fifo_t      fifo;                              /* PES input fifo */
  82
  83     /* The bit stream structure handles the PES stream at the bit level */
  84     bit_stream_t        bit_stream;
  85
  86     /* Output properties */
  87     vout_thread_t *     p_vout;                       /* video output thread */
  88
  89     /* Decoder properties */
  90     struct vdec_thread_s *      pp_vdec[NB_VDEC];
  91     video_fifo_t                vfifo;
  92 #ifdef VDEC_SMP
  93     video_buffer_t              vbuffer;
  94 #endif
  95
  96     /* Parser properties */
  97     sequence_t              sequence;
  98     picture_parsing_t       picture;
  99     macroblock_parsing_t    mb;
 100     video_synchro_t         synchro;
 101
 102     /* Lookup tables */
 103 #ifdef MPEG2_COMPLIANT
 104     s16                     pi_crop_buf[8192];
 105     s16 *                   pi_crop;
 106 #endif
 107     lookup_t                pl_mb_addr_inc[2048];    /* for macroblock
 108                                                         address increment */
 109    /* tables for macroblock types 0=P 1=B */
 110     lookup_t                ppl_mb_type[2][64];
 111     /* table for coded_block_pattern */
 112     lookup_t *              pl_coded_pattern;
 113     /* variable length codes for the structure dct_dc_size for intra blocks */
 114     lookup_t *              pppl_dct_dc_size[2][2];
 115
 116 #ifdef STATS
 117     /* Statistics */
 118     count_t         c_loops;                              /* number of loops */
 119     count_t         c_idle_loops;                    /* number of idle loops */
 120     count_t         c_sequences;                      /* number of sequences */
 121     count_t         c_pictures;                   /* number of pictures read */
 122     count_t         c_i_pictures;               /* number of I pictures read */
 123     count_t         c_p_pictures;               /* number of P pictures read */
 124     count_t         c_b_pictures;               /* number of B pictures read */
 125     count_t         c_decoded_pictures;        /* number of pictures decoded */
 126     count_t         c_decoded_i_pictures;    /* number of I pictures decoded */
 127     count_t         c_decoded_p_pictures;    /* number of P pictures decoded */
 128     count_t         c_decoded_b_pictures;    /* number of B pictures decoded */
 129 #endif
 130 } vpar_thread_t;
 131
 132 /*****************************************************************************
 133  * Prototypes
 134  *****************************************************************************/
 135
 136 /* Thread management functions */
 137 vpar_thread_t * vpar_CreateThread       ( /* video_cfg_t *p_cfg, */ input_thread_t *p_input /*,
 138                                           vout_thread_t *p_vout, int *pi_status */ );
 139 void            vpar_DestroyThread      ( vpar_thread_t *p_vpar /*, int *pi_status */ );
 140
 141 /* Time management functions */
 142 /* ?? */
 143
 144 /* Dynamic thread settings */
 145 /* ?? */
 146
 147
 148 /*****************************************************************************
 149  * NextStartCode : Find the next start code
 150  *****************************************************************************/
 151 static __inline__ void NextStartCode( vpar_thread_t * p_vpar )
 152 {
 153     /* Re-align the buffer on an 8-bit boundary */
 154     RealignBits( &p_vpar->bit_stream );
 155
 156     while( ShowBits( &p_vpar->bit_stream, 24 ) != 0x01L && !p_vpar->b_die )
 157     {
 158         RemoveBits( &p_vpar->bit_stream, 8 );
 159     }
 160 }
 161
 162 /*****************************************************************************
 163  * LoadQuantizerScale
 164  *****************************************************************************
 165  * Quantizer scale factor (ISO/IEC 13818-2 7.4.2.2)
 166  *****************************************************************************/
 167 static __inline__ void LoadQuantizerScale( struct vpar_thread_s * p_vpar )
 168 {
 169     /* Quantization coefficient table */
 170     static u8   ppi_quantizer_scale[3][32] =
 171     {
 172         /* MPEG-2 */
 173         {
 174             /* q_scale_type */
 175             /* linear */
 176             0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,
 177             32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62
 178         },
 179         {
 180             /* non-linear */
 181             0, 1, 2, 3, 4, 5, 6, 7, 8, 10,12,14,16,18,20, 22,
 182             24,28,32,36,40,44,48,52,56,64,72,80,88,96,104,112
 183         },
 184         /* MPEG-1 */
 185         {
 186             0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
 187             16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
 188         }
 189     };
 190
 191     p_vpar->mb.i_quantizer_scale = ppi_quantizer_scale
 192            [(!p_vpar->sequence.b_mpeg2 << 1) | p_vpar->picture.b_q_scale_type]
 193            [GetBits( &p_vpar->bit_stream, 5 )];
 194 }
 195