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 FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef CAVS_H
  23 #define CAVS_H
  24
  25 #include "dsputil.h"
  26 #include "mpegvideo.h"
  27
  28 #define SLICE_MIN_START_CODE    0x00000101
  29 #define SLICE_MAX_START_CODE    0x000001af
  30 #define EXT_START_CODE          0x000001b5
  31 #define USER_START_CODE         0x000001b2
  32 #define CAVS_START_CODE         0x000001b0
  33 #define PIC_I_START_CODE        0x000001b3
  34 #define PIC_PB_START_CODE       0x000001b6
  35
  36 #define A_AVAIL                          1
  37 #define B_AVAIL                          2
  38 #define C_AVAIL                          4
  39 #define D_AVAIL                          8
  40 #define NOT_AVAIL                       -1
  41 #define REF_INTRA                       -2
  42 #define REF_DIR                         -3
  43
  44 #define ESCAPE_CODE                     59
  45
  46 #define FWD0                          0x01
  47 #define FWD1                          0x02
  48 #define BWD0                          0x04
  49 #define BWD1                          0x08
  50 #define SYM0                          0x10
  51 #define SYM1                          0x20
  52 #define SPLITH                        0x40
  53 #define SPLITV                        0x80
  54
  55 #define MV_BWD_OFFS                     12
  56 #define MV_STRIDE                        4
  57
  58 enum mb_t {
  59   I_8X8 = 0,
  60   P_SKIP,
  61   P_16X16,
  62   P_16X8,
  63   P_8X16,
  64   P_8X8,
  65   B_SKIP,
  66   B_DIRECT,
  67   B_FWD_16X16,
  68   B_BWD_16X16,
  69   B_SYM_16X16,
  70   B_8X8 = 29
  71 };
  72
  73 enum sub_mb_t {
  74   B_SUB_DIRECT,
  75   B_SUB_FWD,
  76   B_SUB_BWD,
  77   B_SUB_SYM
  78 };
  79
  80 enum intra_luma_t {
  81   INTRA_L_VERT,
  82   INTRA_L_HORIZ,
  83   INTRA_L_LP,
  84   INTRA_L_DOWN_LEFT,
  85   INTRA_L_DOWN_RIGHT,
  86   INTRA_L_LP_LEFT,
  87   INTRA_L_LP_TOP,
  88   INTRA_L_DC_128
  89 };
  90
  91 enum intra_chroma_t {
  92   INTRA_C_LP,
  93   INTRA_C_HORIZ,
  94   INTRA_C_VERT,
  95   INTRA_C_PLANE,
  96   INTRA_C_LP_LEFT,
  97   INTRA_C_LP_TOP,
  98   INTRA_C_DC_128,
  99 };
 100
 101 enum mv_pred_t {
 102   MV_PRED_MEDIAN,
 103   MV_PRED_LEFT,
 104   MV_PRED_TOP,
 105   MV_PRED_TOPRIGHT,
 106   MV_PRED_PSKIP,
 107   MV_PRED_BSKIP
 108 };
 109
 110 enum block_t {
 111   BLK_16X16,
 112   BLK_16X8,
 113   BLK_8X16,
 114   BLK_8X8
 115 };
 116
 117 enum mv_loc_t {
 118   MV_FWD_D3 = 0,
 119   MV_FWD_B2,
 120   MV_FWD_B3,
 121   MV_FWD_C2,
 122   MV_FWD_A1,
 123   MV_FWD_X0,
 124   MV_FWD_X1,
 125   MV_FWD_A3 = 8,
 126   MV_FWD_X2,
 127   MV_FWD_X3,
 128   MV_BWD_D3 = MV_BWD_OFFS,
 129   MV_BWD_B2,
 130   MV_BWD_B3,
 131   MV_BWD_C2,
 132   MV_BWD_A1,
 133   MV_BWD_X0,
 134   MV_BWD_X1,
 135   MV_BWD_A3 = MV_BWD_OFFS+8,
 136   MV_BWD_X2,
 137   MV_BWD_X3
 138 };
 139
 140 DECLARE_ALIGNED_8(typedef, struct) {
 141     int16_t x;
 142     int16_t y;
 143     int16_t dist;
 144     int16_t ref;
 145 } vector_t;
 146
 147 typedef struct dec_2dvlc_t {
 148   int8_t rltab[59][3];
 149   int8_t level_add[27];
 150   int8_t golomb_order;
 151   int inc_limit;
 152   int8_t max_run;
 153 } dec_2dvlc_t;
 154
 155 typedef struct {
 156     MpegEncContext s;
 157     Picture picture; ///< currently decoded frame
 158     Picture DPB[2];  ///< reference frames
 159     int dist[2];     ///< temporal distances from current frame to ref frames
 160     int profile, level;
 161     int aspect_ratio;
 162     int mb_width, mb_height;
 163     int pic_type;
 164     int progressive;
 165     int pic_structure;
 166     int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
 167     int loop_filter_disable;
 168     int alpha_offset, beta_offset;
 169     int ref_flag;
 170     int mbx, mby;      ///< macroblock coordinates
 171     int flags;         ///< availability flags of neighbouring macroblocks
 172     int stc;           ///< last start code
 173     uint8_t *cy, *cu, *cv; ///< current MB sample pointers
 174     int left_qp;
 175     uint8_t *top_qp;
 176
 177     /** mv motion vector cache
 178        0:    D3  B2  B3  C2
 179        4:    A1  X0  X1   -
 180        8:    A3  X2  X3   -
 181
 182        X are the vectors in the current macroblock (5,6,9,10)
 183        A is the macroblock to the left (4,8)
 184        B is the macroblock to the top (1,2)
 185        C is the macroblock to the top-right (3)
 186        D is the macroblock to the top-left (0)
 187
 188        the same is repeated for backward motion vectors */
 189     vector_t mv[2*4*3];
 190     vector_t *top_mv[2];
 191     vector_t *col_mv;
 192
 193     /** luma pred mode cache
 194        0:    --  B2  B3
 195        3:    A1  X0  X1
 196        6:    A3  X2  X3   */
 197     int pred_mode_Y[3*3];
 198     int *top_pred_Y;
 199     int l_stride, c_stride;
 200     int luma_scan[4];
 201     int qp;
 202     int qp_fixed;
 203     int cbp;
 204     ScanTable scantable;
 205
 206     /** intra prediction is done with un-deblocked samples
 207      they are saved here before deblocking the MB  */
 208     uint8_t *top_border_y, *top_border_u, *top_border_v;
 209     uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
 210     uint8_t intern_border_y[26];
 211     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
 212
 213     void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
 214     void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
 215     uint8_t *col_type_base;
 216     uint8_t *col_type;
 217
 218     /* scaling factors for MV prediction */
 219     int sym_factor;    ///< for scaling in symmetrical B block
 220     int direct_den[2]; ///< for scaling in direct B block
 221     int scale_den[2];  ///< for scaling neighbouring MVs
 222
 223     int got_keyframe;
 224     DCTELEM *block;
 225 } AVSContext;
 226
 227 extern const uint8_t     ff_cavs_dequant_shift[64];
 228 extern const uint16_t    ff_cavs_dequant_mul[64];
 229 extern const dec_2dvlc_t ff_cavs_intra_dec[7];
 230 extern const dec_2dvlc_t ff_cavs_inter_dec[7];
 231 extern const dec_2dvlc_t ff_cavs_chroma_dec[5];
 232 extern const uint8_t     ff_cavs_chroma_qp[64];
 233 extern const uint8_t     ff_cavs_scan3x3[4];
 234 extern const uint8_t     ff_cavs_partition_flags[30];
 235 extern const int_fast8_t ff_left_modifier_l[8];
 236 extern const int_fast8_t ff_top_modifier_l[8];
 237 extern const int_fast8_t ff_left_modifier_c[7];
 238 extern const int_fast8_t ff_top_modifier_c[7];
 239 extern const vector_t ff_cavs_intra_mv;
 240 extern const vector_t ff_cavs_un_mv;
 241 extern const vector_t ff_cavs_dir_mv;
 242
 243 static inline void load_intra_pred_luma(AVSContext *h, uint8_t *top,
 244                                         uint8_t **left, int block) {
 245     int i;
 246
 247     switch(block) {
 248     case 0:
 249         *left = h->left_border_y;
 250         h->left_border_y[0] = h->left_border_y[1];
 251         memset(&h->left_border_y[17],h->left_border_y[16],9);
 252         memcpy(&top[1],&h->top_border_y[h->mbx*16],16);
 253         top[17] = top[16];
 254         top[0] = top[1];
 255         if((h->flags & A_AVAIL) && (h->flags & B_AVAIL))
 256             h->left_border_y[0] = top[0] = h->topleft_border_y;
 257         break;
 258     case 1:
 259         *left = h->intern_border_y;
 260         for(i=0;i<8;i++)
 261             h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride);
 262         memset(&h->intern_border_y[9],h->intern_border_y[8],9);
 263         h->intern_border_y[0] = h->intern_border_y[1];
 264         memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8);
 265         if(h->flags & C_AVAIL)
 266             memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8);
 267         else
 268             memset(&top[9],top[8],9);
 269         top[17] = top[16];
 270         top[0] = top[1];
 271         if(h->flags & B_AVAIL)
 272             h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7];
 273         break;
 274     case 2:
 275         *left = &h->left_border_y[8];
 276         memcpy(&top[1],h->cy + 7*h->l_stride,16);
 277         top[17] = top[16];
 278         top[0] = top[1];
 279         if(h->flags & A_AVAIL)
 280             top[0] = h->left_border_y[8];
 281         break;
 282     case 3:
 283         *left = &h->intern_border_y[8];
 284         for(i=0;i<8;i++)
 285             h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride);
 286         memset(&h->intern_border_y[17],h->intern_border_y[16],9);
 287         memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9);
 288         memset(&top[9],top[8],9);
 289         break;
 290     }
 291 }
 292
 293 static inline void load_intra_pred_chroma(AVSContext *h) {
 294     /* extend borders by one pixel */
 295     h->left_border_u[9] = h->left_border_u[8];
 296     h->left_border_v[9] = h->left_border_v[8];
 297     h->top_border_u[h->mbx*10+9] = h->top_border_u[h->mbx*10+8];
 298     h->top_border_v[h->mbx*10+9] = h->top_border_v[h->mbx*10+8];
 299     if(h->mbx && h->mby) {
 300         h->top_border_u[h->mbx*10] = h->left_border_u[0] = h->topleft_border_u;
 301         h->top_border_v[h->mbx*10] = h->left_border_v[0] = h->topleft_border_v;
 302     } else {
 303         h->left_border_u[0] = h->left_border_u[1];
 304         h->left_border_v[0] = h->left_border_v[1];
 305         h->top_border_u[h->mbx*10] = h->top_border_u[h->mbx*10+1];
 306         h->top_border_v[h->mbx*10] = h->top_border_v[h->mbx*10+1];
 307     }
 308 }
 309
 310 static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {
 311     *mode = mod_table[*mode];
 312     if(*mode < 0) {
 313         av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");
 314         *mode = 0;
 315     }
 316 }
 317
 318 static inline void modify_mb_i(AVSContext *h, int *pred_mode_uv) {
 319     /* save pred modes before they get modified */
 320     h->pred_mode_Y[3] =  h->pred_mode_Y[5];
 321     h->pred_mode_Y[6] =  h->pred_mode_Y[8];
 322     h->top_pred_Y[h->mbx*2+0] = h->pred_mode_Y[7];
 323     h->top_pred_Y[h->mbx*2+1] = h->pred_mode_Y[8];
 324
 325     /* modify pred modes according to availability of neighbour samples */
 326     if(!(h->flags & A_AVAIL)) {
 327         modify_pred(ff_left_modifier_l, &h->pred_mode_Y[4] );
 328         modify_pred(ff_left_modifier_l, &h->pred_mode_Y[7] );
 329         modify_pred(ff_left_modifier_c, pred_mode_uv );
 330     }
 331     if(!(h->flags & B_AVAIL)) {
 332         modify_pred(ff_top_modifier_l, &h->pred_mode_Y[4] );
 333         modify_pred(ff_top_modifier_l, &h->pred_mode_Y[5] );
 334         modify_pred(ff_top_modifier_c, pred_mode_uv );
 335     }
 336 }
 337
 338 static inline void set_intra_mode_default(AVSContext *h) {
 339     h->pred_mode_Y[3] =  h->pred_mode_Y[6] = INTRA_L_LP;
 340     h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;
 341 }
 342
 343 static inline void set_mvs(vector_t *mv, enum block_t size) {
 344     switch(size) {
 345     case BLK_16X16:
 346         mv[MV_STRIDE  ] = mv[0];
 347         mv[MV_STRIDE+1] = mv[0];
 348     case BLK_16X8:
 349         mv[1] = mv[0];
 350         break;
 351     case BLK_8X16:
 352         mv[MV_STRIDE] = mv[0];
 353         break;
 354     }
 355 }
 356
 357 static inline void set_mv_intra(AVSContext *h) {
 358     h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
 359     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
 360     h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
 361     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
 362     if(h->pic_type != FF_B_TYPE)
 363         *h->col_type = I_8X8;
 364 }
 365
 366
 367 /**
 368  * initialise predictors for motion vectors and intra prediction
 369  */
 370 static inline void init_mb(AVSContext *h) {
 371     int i;
 372
 373     /* copy predictors from top line (MB B and C) into cache */
 374     for(i=0;i<3;i++) {
 375         h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i];
 376         h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i];
 377     }
 378     h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0];
 379     h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1];
 380     /* clear top predictors if MB B is not available */
 381     if(!(h->flags & B_AVAIL)) {
 382         h->mv[MV_FWD_B2] = ff_cavs_un_mv;
 383         h->mv[MV_FWD_B3] = ff_cavs_un_mv;
 384         h->mv[MV_BWD_B2] = ff_cavs_un_mv;
 385         h->mv[MV_BWD_B3] = ff_cavs_un_mv;
 386         h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL;
 387         h->flags &= ~(C_AVAIL|D_AVAIL);
 388     } else if(h->mbx) {
 389         h->flags |= D_AVAIL;
 390     }
 391     if(h->mbx == h->mb_width-1) //MB C not available
 392         h->flags &= ~C_AVAIL;
 393     /* clear top-right predictors if MB C is not available */
 394     if(!(h->flags & C_AVAIL)) {
 395         h->mv[MV_FWD_C2] = ff_cavs_un_mv;
 396         h->mv[MV_BWD_C2] = ff_cavs_un_mv;
 397     }
 398     /* clear top-left predictors if MB D is not available */
 399     if(!(h->flags & D_AVAIL)) {
 400         h->mv[MV_FWD_D3] = ff_cavs_un_mv;
 401         h->mv[MV_BWD_D3] = ff_cavs_un_mv;
 402     }
 403     /* set pointer for co-located macroblock type */
 404     h->col_type = &h->col_type_base[h->mby*h->mb_width + h->mbx];
 405 }
 406
 407 /**
 408  * save predictors for later macroblocks and increase
 409  * macroblock address
 410  * @returns 0 if end of frame is reached, 1 otherwise
 411  */
 412 static inline int next_mb(AVSContext *h) {
 413     int i;
 414
 415     h->flags |= A_AVAIL;
 416     h->cy += 16;
 417     h->cu += 8;
 418     h->cv += 8;
 419     /* copy mvs as predictors to the left */
 420     for(i=0;i<=20;i+=4)
 421         h->mv[i] = h->mv[i+2];
 422     /* copy bottom mvs from cache to top line */
 423     h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2];
 424     h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3];
 425     h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2];
 426     h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3];
 427     /* next MB address */
 428     h->mbx++;
 429     if(h->mbx == h->mb_width) { //new mb line
 430         h->flags = B_AVAIL|C_AVAIL;
 431         /* clear left pred_modes */
 432         h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
 433         /* clear left mv predictors */
 434         for(i=0;i<=20;i+=4)
 435             h->mv[i] = ff_cavs_un_mv;
 436         h->mbx = 0;
 437         h->mby++;
 438         /* re-calculate sample pointers */
 439         h->cy = h->picture.data[0] + h->mby*16*h->l_stride;
 440         h->cu = h->picture.data[1] + h->mby*8*h->c_stride;
 441         h->cv = h->picture.data[2] + h->mby*8*h->c_stride;
 442         if(h->mby == h->mb_height) { //frame end
 443             return 0;
 444         } else {
 445             //check_for_slice(h);
 446         }
 447     }
 448     return 1;
 449 }
 450
 451 static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,
 452                           DCTELEM *dst, int mul, int shift, int coeff_num) {
 453     int round = 1 << (shift - 1);
 454     int pos = -1;
 455     const uint8_t *scantab = h->scantable.permutated;
 456
 457     /* inverse scan and dequantization */
 458     while(--coeff_num >= 0){
 459         pos += run_buf[coeff_num];
 460         if(pos > 63) {
 461             av_log(h->s.avctx, AV_LOG_ERROR,
 462                 "position out of block bounds at pic %d MB(%d,%d)\n",
 463                 h->picture.poc, h->mbx, h->mby);
 464             return -1;
 465         }
 466         dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift;
 467     }
 468     return 0;
 469 }
 470
 471 void ff_cavs_filter(AVSContext *h, enum mb_t mb_type);
 472 void ff_cavs_inter(AVSContext *h, enum mb_t mb_type);
 473 void ff_cavs_mv(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC,
 474                 enum mv_pred_t mode, enum block_t size, int ref);
 475 void ff_cavs_init_pic(AVSContext *h);
 476 void ff_cavs_init_top_lines(AVSContext *h);
 477 int ff_cavs_init(AVCodecContext *avctx);
 478 int ff_cavs_end (AVCodecContext *avctx);
 479
 480 #endif /* CAVS_H */