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 AVCODEC_CAVS_H 23#define AVCODEC_CAVS_H 24 25#include "dsputil.h" 26#include "mpegvideo.h" 27 28#define SLICE_MAX_START_CODE 0x000001af 29#define EXT_START_CODE 0x000001b5 30#define USER_START_CODE 0x000001b2 31#define CAVS_START_CODE 0x000001b0 32#define PIC_I_START_CODE 0x000001b3 33#define PIC_PB_START_CODE 0x000001b6 34 35#define A_AVAIL 1 36#define B_AVAIL 2 37#define C_AVAIL 4 38#define D_AVAIL 8 39#define NOT_AVAIL -1 40#define REF_INTRA -2 41#define REF_DIR -3 42 43#define ESCAPE_CODE 59 44 45#define FWD0 0x01 46#define FWD1 0x02 47#define BWD0 0x04 48#define BWD1 0x08 49#define SYM0 0x10 50#define SYM1 0x20 51#define SPLITH 0x40 52#define SPLITV 0x80 53 54#define MV_BWD_OFFS 12 55#define MV_STRIDE 4 56 57enum cavs_mb { 58 I_8X8 = 0, 59 P_SKIP, 60 P_16X16, 61 P_16X8, 62 P_8X16, 63 P_8X8, 64 B_SKIP, 65 B_DIRECT, 66 B_FWD_16X16, 67 B_BWD_16X16, 68 B_SYM_16X16, 69 B_8X8 = 29 70}; 71 72enum cavs_sub_mb { 73 B_SUB_DIRECT, 74 B_SUB_FWD, 75 B_SUB_BWD, 76 B_SUB_SYM 77}; 78 79enum cavs_intra_luma { 80 INTRA_L_VERT, 81 INTRA_L_HORIZ, 82 INTRA_L_LP, 83 INTRA_L_DOWN_LEFT, 84 INTRA_L_DOWN_RIGHT, 85 INTRA_L_LP_LEFT, 86 INTRA_L_LP_TOP, 87 INTRA_L_DC_128 88}; 89 90enum cavs_intra_chroma { 91 INTRA_C_LP, 92 INTRA_C_HORIZ, 93 INTRA_C_VERT, 94 INTRA_C_PLANE, 95 INTRA_C_LP_LEFT, 96 INTRA_C_LP_TOP, 97 INTRA_C_DC_128, 98}; 99 100enum cavs_mv_pred { 101 MV_PRED_MEDIAN, 102 MV_PRED_LEFT, 103 MV_PRED_TOP, 104 MV_PRED_TOPRIGHT, 105 MV_PRED_PSKIP, 106 MV_PRED_BSKIP 107}; 108 109enum cavs_block { 110 BLK_16X16, 111 BLK_16X8, 112 BLK_8X16, 113 BLK_8X8 114}; 115 116enum cavs_mv_loc { 117 MV_FWD_D3 = 0, 118 MV_FWD_B2, 119 MV_FWD_B3, 120 MV_FWD_C2, 121 MV_FWD_A1, 122 MV_FWD_X0, 123 MV_FWD_X1, 124 MV_FWD_A3 = 8, 125 MV_FWD_X2, 126 MV_FWD_X3, 127 MV_BWD_D3 = MV_BWD_OFFS, 128 MV_BWD_B2, 129 MV_BWD_B3, 130 MV_BWD_C2, 131 MV_BWD_A1, 132 MV_BWD_X0, 133 MV_BWD_X1, 134 MV_BWD_A3 = MV_BWD_OFFS+8, 135 MV_BWD_X2, 136 MV_BWD_X3 137}; 138 139DECLARE_ALIGNED(8, typedef, struct) { 140 int16_t x; 141 int16_t y; 142 int16_t dist; 143 int16_t ref; 144} cavs_vector; 145 146struct dec_2dvlc { 147 int8_t rltab[59][3]; 148 int8_t level_add[27]; 149 int8_t golomb_order; 150 int inc_limit; 151 int8_t max_run; 152}; 153 154typedef struct { 155 MpegEncContext s; 156 Picture picture; ///< currently decoded frame 157 Picture DPB[2]; ///< reference frames 158 int dist[2]; ///< temporal distances from current frame to ref frames 159 int profile, level; 160 int aspect_ratio; 161 int mb_width, mb_height; 162 int pic_type; 163 int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder 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, mbidx; ///< 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 cavs_vector mv[2*4*3]; 190 cavs_vector *top_mv[2]; 191 cavs_vector *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; 216 217 /* scaling factors for MV prediction */ 218 int sym_factor; ///< for scaling in symmetrical B block 219 int direct_den[2]; ///< for scaling in direct B block 220 int scale_den[2]; ///< for scaling neighbouring MVs 221 222 int got_keyframe; 223 DCTELEM *block; 224} AVSContext; 225 226extern const uint8_t ff_cavs_dequant_shift[64]; 227extern const uint16_t ff_cavs_dequant_mul[64]; 228extern const struct dec_2dvlc ff_cavs_intra_dec[7]; 229extern const struct dec_2dvlc ff_cavs_inter_dec[7]; 230extern const struct dec_2dvlc ff_cavs_chroma_dec[5]; 231extern const uint8_t ff_cavs_chroma_qp[64]; 232extern const uint8_t ff_cavs_scan3x3[4]; 233extern const uint8_t ff_cavs_partition_flags[30]; 234extern const int_fast8_t ff_left_modifier_l[8]; 235extern const int_fast8_t ff_top_modifier_l[8]; 236extern const int_fast8_t ff_left_modifier_c[7]; 237extern const int_fast8_t ff_top_modifier_c[7]; 238extern const cavs_vector ff_cavs_intra_mv; 239extern const cavs_vector ff_cavs_un_mv; 240extern const cavs_vector ff_cavs_dir_mv; 241 242static inline void modify_pred(const int_fast8_t *mod_table, int *mode) { 243 *mode = mod_table[*mode]; 244 if(*mode < 0) { 245 av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n"); 246 *mode = 0; 247 } 248} 249 250static inline void set_intra_mode_default(AVSContext *h) { 251 if(h->stream_revision > 0) { 252 h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL; 253 h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = NOT_AVAIL; 254 } else { 255 h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP; 256 h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP; 257 } 258} 259 260static inline void set_mvs(cavs_vector *mv, enum cavs_block size) { 261 switch(size) { 262 case BLK_16X16: 263 mv[MV_STRIDE ] = mv[0]; 264 mv[MV_STRIDE+1] = mv[0]; 265 case BLK_16X8: 266 mv[1] = mv[0]; 267 break; 268 case BLK_8X16: 269 mv[MV_STRIDE] = mv[0]; 270 break; 271 } 272} 273 274static inline void set_mv_intra(AVSContext *h) { 275 h->mv[MV_FWD_X0] = ff_cavs_intra_mv; 276 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); 277 h->mv[MV_BWD_X0] = ff_cavs_intra_mv; 278 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); 279 if(h->pic_type != FF_B_TYPE) 280 h->col_type_base[h->mbidx] = I_8X8; 281} 282 283static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf, 284 DCTELEM *dst, int mul, int shift, int coeff_num) { 285 int round = 1 << (shift - 1); 286 int pos = -1; 287 const uint8_t *scantab = h->scantable.permutated; 288 289 /* inverse scan and dequantization */ 290 while(--coeff_num >= 0){ 291 pos += run_buf[coeff_num]; 292 if(pos > 63) { 293 av_log(h->s.avctx, AV_LOG_ERROR, 294 "position out of block bounds at pic %d MB(%d,%d)\n", 295 h->picture.poc, h->mbx, h->mby); 296 return -1; 297 } 298 dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift; 299 } 300 return 0; 301} 302 303void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type); 304void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left, 305 int block); 306void ff_cavs_load_intra_pred_chroma(AVSContext *h); 307void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv); 308void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type); 309void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC, 310 enum cavs_mv_pred mode, enum cavs_block size, int ref); 311void ff_cavs_init_mb(AVSContext *h); 312int ff_cavs_next_mb(AVSContext *h); 313void ff_cavs_init_pic(AVSContext *h); 314void ff_cavs_init_top_lines(AVSContext *h); 315int ff_cavs_init(AVCodecContext *avctx); 316int ff_cavs_end (AVCodecContext *avctx); 317 318#endif /* AVCODEC_CAVS_H */ 319