libavcodec/cavs.h

   1 /*
   2  * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
   3  * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef AVCODEC_CAVS_H
  23 #define AVCODEC_CAVS_H
  24
  25 #include "bitstream.h"
  26 #include "cavsdsp.h"
  27 #include "blockdsp.h"
  28 #include "h264chroma.h"
  29 #include "idctdsp.h"
  30 #include "videodsp.h"
  31
  32 #define SLICE_MAX_START_CODE    0x000001af
  33 #define EXT_START_CODE          0x000001b5
  34 #define USER_START_CODE         0x000001b2
  35 #define CAVS_START_CODE         0x000001b0
  36 #define PIC_I_START_CODE        0x000001b3
  37 #define PIC_PB_START_CODE       0x000001b6
  38
  39 #define A_AVAIL                          1
  40 #define B_AVAIL                          2
  41 #define C_AVAIL                          4
  42 #define D_AVAIL                          8
  43 #define NOT_AVAIL                       -1
  44 #define REF_INTRA                       -2
  45 #define REF_DIR                         -3
  46
  47 #define ESCAPE_CODE                     59
  48
  49 #define FWD0                          0x01
  50 #define FWD1                          0x02
  51 #define BWD0                          0x04
  52 #define BWD1                          0x08
  53 #define SYM0                          0x10
  54 #define SYM1                          0x20
  55 #define SPLITH                        0x40
  56 #define SPLITV                        0x80
  57
  58 #define MV_BWD_OFFS                     12
  59 #define MV_STRIDE                        4
  60
  61 enum cavs_mb {
  62   I_8X8 = 0,
  63   P_SKIP,
  64   P_16X16,
  65   P_16X8,
  66   P_8X16,
  67   P_8X8,
  68   B_SKIP,
  69   B_DIRECT,
  70   B_FWD_16X16,
  71   B_BWD_16X16,
  72   B_SYM_16X16,
  73   B_8X8 = 29
  74 };
  75
  76 enum cavs_sub_mb {
  77   B_SUB_DIRECT,
  78   B_SUB_FWD,
  79   B_SUB_BWD,
  80   B_SUB_SYM
  81 };
  82
  83 enum cavs_intra_luma {
  84   INTRA_L_VERT,
  85   INTRA_L_HORIZ,
  86   INTRA_L_LP,
  87   INTRA_L_DOWN_LEFT,
  88   INTRA_L_DOWN_RIGHT,
  89   INTRA_L_LP_LEFT,
  90   INTRA_L_LP_TOP,
  91   INTRA_L_DC_128
  92 };
  93
  94 enum cavs_intra_chroma {
  95   INTRA_C_LP,
  96   INTRA_C_HORIZ,
  97   INTRA_C_VERT,
  98   INTRA_C_PLANE,
  99   INTRA_C_LP_LEFT,
 100   INTRA_C_LP_TOP,
 101   INTRA_C_DC_128,
 102 };
 103
 104 enum cavs_mv_pred {
 105   MV_PRED_MEDIAN,
 106   MV_PRED_LEFT,
 107   MV_PRED_TOP,
 108   MV_PRED_TOPRIGHT,
 109   MV_PRED_PSKIP,
 110   MV_PRED_BSKIP
 111 };
 112
 113 enum cavs_block {
 114   BLK_16X16,
 115   BLK_16X8,
 116   BLK_8X16,
 117   BLK_8X8
 118 };
 119
 120 enum cavs_mv_loc {
 121   MV_FWD_D3 = 0,
 122   MV_FWD_B2,
 123   MV_FWD_B3,
 124   MV_FWD_C2,
 125   MV_FWD_A1,
 126   MV_FWD_X0,
 127   MV_FWD_X1,
 128   MV_FWD_A3 = 8,
 129   MV_FWD_X2,
 130   MV_FWD_X3,
 131   MV_BWD_D3 = MV_BWD_OFFS,
 132   MV_BWD_B2,
 133   MV_BWD_B3,
 134   MV_BWD_C2,
 135   MV_BWD_A1,
 136   MV_BWD_X0,
 137   MV_BWD_X1,
 138   MV_BWD_A3 = MV_BWD_OFFS+8,
 139   MV_BWD_X2,
 140   MV_BWD_X3
 141 };
 142
 143 DECLARE_ALIGNED(8, typedef, struct) {
 144     int16_t x;
 145     int16_t y;
 146     int16_t dist;
 147     int16_t ref;
 148 } cavs_vector;
 149
 150 struct dec_2dvlc {
 151   int8_t rltab[59][3];
 152   int8_t level_add[27];
 153   int8_t golomb_order;
 154   int inc_limit;
 155   int8_t max_run;
 156 };
 157
 158 typedef struct AVSFrame {
 159     AVFrame *f;
 160     int poc;
 161 } AVSFrame;
 162
 163 typedef struct AVSContext {
 164     AVCodecContext *avctx;
 165     BlockDSPContext bdsp;
 166     H264ChromaContext h264chroma;
 167     IDCTDSPContext idsp;
 168     VideoDSPContext vdsp;
 169     CAVSDSPContext  cdsp;
 170     BitstreamContext bc;
 171     AVSFrame cur;     ///< currently decoded frame
 172     AVSFrame DPB[2];  ///< reference frames
 173     int dist[2];     ///< temporal distances from current frame to ref frames
 174     int low_delay;
 175     int profile, level;
 176     int aspect_ratio;
 177     int mb_width, mb_height;
 178     int width, height;
 179     int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder
 180     int progressive;
 181     int pic_structure;
 182     int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
 183     int loop_filter_disable;
 184     int alpha_offset, beta_offset;
 185     int ref_flag;
 186     int mbx, mby, mbidx; ///< macroblock coordinates
 187     int flags;         ///< availability flags of neighbouring macroblocks
 188     int stc;           ///< last start code
 189     uint8_t *cy, *cu, *cv; ///< current MB sample pointers
 190     int left_qp;
 191     uint8_t *top_qp;
 192
 193     /** mv motion vector cache
 194        0:    D3  B2  B3  C2
 195        4:    A1  X0  X1   -
 196        8:    A3  X2  X3   -
 197
 198        X are the vectors in the current macroblock (5,6,9,10)
 199        A is the macroblock to the left (4,8)
 200        B is the macroblock to the top (1,2)
 201        C is the macroblock to the top-right (3)
 202        D is the macroblock to the top-left (0)
 203
 204        the same is repeated for backward motion vectors */
 205     cavs_vector mv[2*4*3];
 206     cavs_vector *top_mv[2];
 207     cavs_vector *col_mv;
 208
 209     /** luma pred mode cache
 210        0:    --  B2  B3
 211        3:    A1  X0  X1
 212        6:    A3  X2  X3   */
 213     int pred_mode_Y[3*3];
 214     int *top_pred_Y;
 215     ptrdiff_t l_stride, c_stride;
 216     int luma_scan[4];
 217     int qp;
 218     int qp_fixed;
 219     int cbp;
 220     ScanTable scantable;
 221
 222     /** intra prediction is done with un-deblocked samples
 223      they are saved here before deblocking the MB  */
 224     uint8_t *top_border_y, *top_border_u, *top_border_v;
 225     uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
 226     uint8_t intern_border_y[26];
 227     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
 228
 229     void (*intra_pred_l[8])(uint8_t *d, uint8_t *top, uint8_t *left, ptrdiff_t stride);
 230     void (*intra_pred_c[7])(uint8_t *d, uint8_t *top, uint8_t *left, ptrdiff_t stride);
 231     uint8_t *col_type_base;
 232
 233     /* scaling factors for MV prediction */
 234     int sym_factor;    ///< for scaling in symmetrical B block
 235     int direct_den[2]; ///< for scaling in direct B block
 236     int scale_den[2];  ///< for scaling neighbouring MVs
 237
 238     uint8_t *edge_emu_buffer;
 239
 240     int got_keyframe;
 241     int16_t *block;
 242 } AVSContext;
 243
 244 extern const uint8_t     ff_cavs_partition_flags[30];
 245 extern const cavs_vector ff_cavs_intra_mv;
 246 extern const cavs_vector ff_cavs_dir_mv;
 247
 248 static inline void set_mvs(cavs_vector *mv, enum cavs_block size) {
 249     switch(size) {
 250     case BLK_16X16:
 251         mv[MV_STRIDE  ] = mv[0];
 252         mv[MV_STRIDE+1] = mv[0];
 253     case BLK_16X8:
 254         mv[1] = mv[0];
 255         break;
 256     case BLK_8X16:
 257         mv[MV_STRIDE] = mv[0];
 258         break;
 259     }
 260 }
 261
 262 void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type);
 263 void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
 264                                   int block);
 265 void ff_cavs_load_intra_pred_chroma(AVSContext *h);
 266 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
 267 void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type);
 268 void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
 269                 enum cavs_mv_pred mode, enum cavs_block size, int ref);
 270 void ff_cavs_init_mb(AVSContext *h);
 271 int  ff_cavs_next_mb(AVSContext *h);
 272 void ff_cavs_init_pic(AVSContext *h);
 273 void ff_cavs_init_top_lines(AVSContext *h);
 274 int ff_cavs_init(AVCodecContext *avctx);
 275 int ff_cavs_end (AVCodecContext *avctx);
 276
 277 #endif /* AVCODEC_CAVS_H */