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

   1 /*****************************************************************************
   2  * video_parser.h : video parser thread
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000 VideoLAN
   5  *
   6  * Authors:
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public
  19  * License along with this program; if not, write to the
  20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21  * Boston, MA 02111-1307, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Requires:
  26  *  "config.h"
  27  *  "common.h"
  28  *  "mtime.h"
  29  *  "threads.h"
  30  *  "input.h"
  31  *  "video.h"
  32  *  "video_output.h"
  33  *  "decoder_fifo.h"
  34  *  "video_fifo.h"
  35  *  "vpar_headers.h"
  36  *****************************************************************************/
  37
  38 /*****************************************************************************
  39  * video_fifo_t
  40  *****************************************************************************
  41  * This rotative FIFO contains undecoded macroblocks that are to be decoded
  42  *****************************************************************************/
  43 struct vpar_thread_s;
  44
  45 typedef struct video_fifo_s
  46 {
  47 #ifdef VDEC_SMP
  48     vlc_mutex_t         lock;                              /* fifo data lock */
  49     vlc_cond_t          wait;              /* fifo data conditional variable */
  50
  51     /* buffer is an array of undec_picture_t pointers */
  52     macroblock_t *      buffer[VFIFO_SIZE + 1];
  53     int                 i_start;
  54     int                 i_end;
  55 #else
  56     macroblock_t        buffer;
  57 #endif
  58
  59     struct vpar_thread_s *      p_vpar;
  60 } video_fifo_t;
  61
  62 /*****************************************************************************
  63  * video_buffer_t
  64  *****************************************************************************
  65  * This structure enables the parser to maintain a list of free
  66  * macroblock_t structures
  67  *****************************************************************************/
  68 #ifdef VDEC_SMP
  69 typedef struct video_buffer_s
  70 {
  71     vlc_mutex_t         lock;                            /* buffer data lock */
  72
  73     macroblock_t        p_macroblocks[VFIFO_SIZE + 1];
  74     macroblock_t *      pp_mb_free[VFIFO_SIZE+1];          /* this is a LIFO */
  75     int                 i_index;
  76 } video_buffer_t;
  77 #endif
  78
  79 /*****************************************************************************
  80  * vpar_thread_t: video parser thread descriptor
  81  *****************************************************************************
  82  * XXX??
  83  *****************************************************************************/
  84 typedef struct vpar_thread_s
  85 {
  86     /* Thread properties and locks */
  87     boolean_t           b_die;                                 /* `die' flag */
  88     boolean_t           b_run;                                 /* `run' flag */
  89     boolean_t           b_error;                             /* `error' flag */
  90     boolean_t           b_active;                           /* `active' flag */
  91     vlc_thread_t        thread_id;                /* id for thread functions */
  92
  93     /* Thread configuration */
  94     /* XXX?? */
  95 //    int *pi_status;
  96
  97
  98     /* Input properties */
  99     decoder_fifo_t      fifo;                              /* PES input fifo */
 100
 101     /* The bit stream structure handles the PES stream at the bit level */
 102     bit_stream_t        bit_stream;
 103
 104     /* Output properties */
 105     vout_thread_t *     p_vout;                       /* video output thread */
 106
 107     /* Decoder properties */
 108     struct vdec_thread_s *      pp_vdec[NB_VDEC];
 109     video_fifo_t                vfifo;
 110 #ifdef VDEC_SMP
 111     video_buffer_t              vbuffer;
 112 #endif
 113
 114     /* Parser properties */
 115     sequence_t              sequence;
 116     picture_parsing_t       picture;
 117     macroblock_parsing_t    mb;
 118     video_synchro_t         synchro;
 119
 120     /* Lookup tables */
 121 #ifdef MPEG2_COMPLIANT
 122     s16                     pi_crop_buf[8192];
 123     s16 *                   pi_crop;
 124 #endif
 125     lookup_t                pl_mb_addr_inc[2048];    /* for macroblock
 126                                                         address increment */
 127     /* tables for macroblock types 0=P 1=B */
 128     lookup_t                ppl_mb_type[2][64];
 129     /* table for coded_block_pattern */
 130     lookup_t *              pl_coded_pattern;
 131     /* variable length codes for the structure dct_dc_size for intra blocks */
 132     lookup_t *              pppl_dct_dc_size[2][2];
 133     /* Structure to store the tables B14 & B15 (ISO/CEI 13818-2 B.4) */
 134      dct_lookup_t           ppl_dct_coef[2][16384];
 135
 136
 137
 138 #ifdef STATS
 139     /* Statistics */
 140     count_t         c_loops;                              /* number of loops */
 141     count_t         c_idle_loops;                    /* number of idle loops */
 142     count_t         c_sequences;                      /* number of sequences */
 143     count_t         c_pictures;                   /* number of pictures read */
 144     count_t         c_i_pictures;               /* number of I pictures read */
 145     count_t         c_p_pictures;               /* number of P pictures read */
 146     count_t         c_b_pictures;               /* number of B pictures read */
 147     count_t         c_decoded_pictures;        /* number of pictures decoded */
 148     count_t         c_decoded_i_pictures;    /* number of I pictures decoded */
 149     count_t         c_decoded_p_pictures;    /* number of P pictures decoded */
 150     count_t         c_decoded_b_pictures;    /* number of B pictures decoded */
 151 #endif
 152 } vpar_thread_t;
 153
 154 /*****************************************************************************
 155  * Prototypes
 156  *****************************************************************************/
 157
 158 /* Thread management functions */
 159 vpar_thread_t * vpar_CreateThread       ( /* video_cfg_t *p_cfg, */ input_thread_t *p_input /*,
 160                                           vout_thread_t *p_vout, int *pi_status */ );
 161 void            vpar_DestroyThread      ( vpar_thread_t *p_vpar /*, int *pi_status */ );
 162
 163 /* Time management functions */
 164 /* XXX?? */
 165
 166 /* Dynamic thread settings */
 167 /* XXX?? */
 168
 169
 170 /*****************************************************************************
 171  * NextStartCode : Find the next start code
 172  *****************************************************************************/
 173 static __inline__ void NextStartCode( vpar_thread_t * p_vpar )
 174 {
 175     /* Re-align the buffer on an 8-bit boundary */
 176     RealignBits( &p_vpar->bit_stream );
 177
 178     while( ShowBits( &p_vpar->bit_stream, 24 ) != 0x01L && !p_vpar->b_die )
 179     {
 180         RemoveBits( &p_vpar->bit_stream, 8 );
 181     }
 182 }
 183
 184 /*****************************************************************************
 185  * LoadQuantizerScale
 186  *****************************************************************************
 187  * Quantizer scale factor (ISO/IEC 13818-2 7.4.2.2)
 188  *****************************************************************************/
 189 static __inline__ void LoadQuantizerScale( struct vpar_thread_s * p_vpar )
 190 {
 191     /* Quantization coefficient table */
 192     static u8   ppi_quantizer_scale[3][32] =
 193     {
 194         /* MPEG-2 */
 195         {
 196             /* q_scale_type */
 197             /* linear */
 198             0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,
 199             32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62
 200         },
 201         {
 202             /* non-linear */
 203             0, 1, 2, 3, 4, 5, 6, 7, 8, 10,12,14,16,18,20, 22,
 204             24,28,32,36,40,44,48,52,56,64,72,80,88,96,104,112
 205         },
 206         /* MPEG-1 */
 207         {
 208             0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
 209             16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
 210         }
 211     };
 212
 213     p_vpar->mb.i_quantizer_scale = ppi_quantizer_scale
 214            [(!p_vpar->sequence.b_mpeg2 << 1) | p_vpar->picture.b_q_scale_type]
 215            [GetBits( &p_vpar->bit_stream, 5 )];
 216 }
 217