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 "dsputil.h" 26#include "mpegvideo.h" 27#include "cavsdsp.h" 28 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 58enum cavs_mb { 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 73enum cavs_sub_mb { 74 B_SUB_DIRECT, 75 B_SUB_FWD, 76 B_SUB_BWD, 77 B_SUB_SYM 78}; 79 80enum cavs_intra_luma { 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 91enum cavs_intra_chroma { 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 101enum cavs_mv_pred { 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 110enum cavs_block { 111 BLK_16X16, 112 BLK_16X8, 113 BLK_8X16, 114 BLK_8X8 115}; 116 117enum cavs_mv_loc { 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 140DECLARE_ALIGNED(8, typedef, struct) { 141 int16_t x; 142 int16_t y; 143 int16_t dist; 144 int16_t ref; 145} cavs_vector; 146 147struct dec_2dvlc { 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}; 154 155typedef struct { 156 MpegEncContext s; 157 CAVSDSPContext cdsp; 158 Picture picture; ///< currently decoded frame 159 Picture DPB[2]; ///< reference frames 160 int dist[2]; ///< temporal distances from current frame to ref frames 161 int profile, level; 162 int aspect_ratio; 163 int mb_width, mb_height; 164 int pic_type; 165 int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder 166 int progressive; 167 int pic_structure; 168 int skip_mode_flag; ///< select between skip_count or one skip_flag per MB 169 int loop_filter_disable; 170 int alpha_offset, beta_offset; 171 int ref_flag; 172 int mbx, mby, mbidx; ///< macroblock coordinates 173 int flags; ///< availability flags of neighbouring macroblocks 174 int stc; ///< last start code 175 uint8_t *cy, *cu, *cv; ///< current MB sample pointers 176 int left_qp; 177 uint8_t *top_qp; 178 179 /** mv motion vector cache 180 0: D3 B2 B3 C2 181 4: A1 X0 X1 - 182 8: A3 X2 X3 - 183 184 X are the vectors in the current macroblock (5,6,9,10) 185 A is the macroblock to the left (4,8) 186 B is the macroblock to the top (1,2) 187 C is the macroblock to the top-right (3) 188 D is the macroblock to the top-left (0) 189 190 the same is repeated for backward motion vectors */ 191 cavs_vector mv[2*4*3]; 192 cavs_vector *top_mv[2]; 193 cavs_vector *col_mv; 194 195 /** luma pred mode cache 196 0: -- B2 B3 197 3: A1 X0 X1 198 6: A3 X2 X3 */ 199 int pred_mode_Y[3*3]; 200 int *top_pred_Y; 201 int l_stride, c_stride; 202 int luma_scan[4]; 203 int qp; 204 int qp_fixed; 205 int cbp; 206 ScanTable scantable; 207 208 /** intra prediction is done with un-deblocked samples 209 they are saved here before deblocking the MB */ 210 uint8_t *top_border_y, *top_border_u, *top_border_v; 211 uint8_t left_border_y[26], left_border_u[10], left_border_v[10]; 212 uint8_t intern_border_y[26]; 213 uint8_t topleft_border_y, topleft_border_u, topleft_border_v; 214 215 void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride); 216 void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride); 217 uint8_t *col_type_base; 218 219 /* scaling factors for MV prediction */ 220 int sym_factor; ///< for scaling in symmetrical B block 221 int direct_den[2]; ///< for scaling in direct B block 222 int scale_den[2]; ///< for scaling neighbouring MVs 223 224 int got_keyframe; 225 DCTELEM *block; 226} AVSContext; 227 228extern const uint8_t ff_cavs_dequant_shift[64]; 229extern const uint16_t ff_cavs_dequant_mul[64]; 230extern const struct dec_2dvlc ff_cavs_intra_dec[7]; 231extern const struct dec_2dvlc ff_cavs_inter_dec[7]; 232extern const struct dec_2dvlc ff_cavs_chroma_dec[5]; 233extern const uint8_t ff_cavs_chroma_qp[64]; 234extern const uint8_t ff_cavs_scan3x3[4]; 235extern const uint8_t ff_cavs_partition_flags[30]; 236extern const int8_t ff_left_modifier_l[8]; 237extern const int8_t ff_top_modifier_l[8]; 238extern const int8_t ff_left_modifier_c[7]; 239extern const int8_t ff_top_modifier_c[7]; 240extern const cavs_vector ff_cavs_intra_mv; 241extern const cavs_vector ff_cavs_un_mv; 242extern const cavs_vector ff_cavs_dir_mv; 243 244static inline void modify_pred(const int8_t *mod_table, int *mode) 245{ 246 *mode = mod_table[*mode]; 247 if(*mode < 0) { 248 av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n"); 249 *mode = 0; 250 } 251} 252 253static inline void set_intra_mode_default(AVSContext *h) { 254 if(h->stream_revision > 0) { 255 h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL; 256 h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = NOT_AVAIL; 257 } else { 258 h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP; 259 h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP; 260 } 261} 262 263static inline void set_mvs(cavs_vector *mv, enum cavs_block size) { 264 switch(size) { 265 case BLK_16X16: 266 mv[MV_STRIDE ] = mv[0]; 267 mv[MV_STRIDE+1] = mv[0]; 268 case BLK_16X8: 269 mv[1] = mv[0]; 270 break; 271 case BLK_8X16: 272 mv[MV_STRIDE] = mv[0]; 273 break; 274 } 275} 276 277static inline void set_mv_intra(AVSContext *h) { 278 h->mv[MV_FWD_X0] = ff_cavs_intra_mv; 279 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); 280 h->mv[MV_BWD_X0] = ff_cavs_intra_mv; 281 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); 282 if(h->pic_type != AV_PICTURE_TYPE_B) 283 h->col_type_base[h->mbidx] = I_8X8; 284} 285 286static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf, 287 DCTELEM *dst, int mul, int shift, int coeff_num) { 288 int round = 1 << (shift - 1); 289 int pos = -1; 290 const uint8_t *scantab = h->scantable.permutated; 291 292 /* inverse scan and dequantization */ 293 while(--coeff_num >= 0){ 294 pos += run_buf[coeff_num]; 295 if(pos > 63) { 296 av_log(h->s.avctx, AV_LOG_ERROR, 297 "position out of block bounds at pic %d MB(%d,%d)\n", 298 h->picture.poc, h->mbx, h->mby); 299 return -1; 300 } 301 dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift; 302 } 303 return 0; 304} 305 306void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type); 307void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left, 308 int block); 309void ff_cavs_load_intra_pred_chroma(AVSContext *h); 310void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv); 311void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type); 312void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC, 313 enum cavs_mv_pred mode, enum cavs_block size, int ref); 314void ff_cavs_init_mb(AVSContext *h); 315int ff_cavs_next_mb(AVSContext *h); 316void ff_cavs_init_pic(AVSContext *h); 317void ff_cavs_init_top_lines(AVSContext *h); 318int ff_cavs_init(AVCodecContext *avctx); 319int ff_cavs_end (AVCodecContext *avctx); 320 321#endif /* AVCODEC_CAVS_H */ 322