2 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
3 * Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef AVCODEC_CAVS_H
23 #define AVCODEC_CAVS_H
26 #include "mpegvideo.h"
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
44 #define ESCAPE_CODE 59
55 #define MV_BWD_OFFS 12
128 MV_BWD_D3 = MV_BWD_OFFS,
135 MV_BWD_A3 = MV_BWD_OFFS+8,
140 DECLARE_ALIGNED_8(typedef, struct) {
149 int8_t level_add[27];
157 Picture picture; ///< currently decoded frame
158 Picture DPB[2]; ///< reference frames
159 int dist[2]; ///< temporal distances from current frame to ref frames
162 int mb_width, mb_height;
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;
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
177 /** mv motion vector cache
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)
188 the same is repeated for backward motion vectors */
193 /** luma pred mode cache
197 int pred_mode_Y[3*3];
199 int l_stride, c_stride;
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;
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;
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
227 extern const uint8_t ff_cavs_dequant_shift[64];
228 extern const uint16_t ff_cavs_dequant_mul[64];
229 extern const struct dec_2dvlc ff_cavs_intra_dec[7];
230 extern const struct dec_2dvlc ff_cavs_inter_dec[7];
231 extern const struct dec_2dvlc 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;
243 static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {
244 *mode = mod_table[*mode];
246 av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");
251 static inline void set_intra_mode_default(AVSContext *h) {
252 h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
253 h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;
256 static inline void set_mvs(vector_t *mv, enum block_t size) {
259 mv[MV_STRIDE ] = mv[0];
260 mv[MV_STRIDE+1] = mv[0];
265 mv[MV_STRIDE] = mv[0];
270 static inline void set_mv_intra(AVSContext *h) {
271 h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
272 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
273 h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
274 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
275 if(h->pic_type != FF_B_TYPE)
276 *h->col_type = I_8X8;
279 static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,
280 DCTELEM *dst, int mul, int shift, int coeff_num) {
281 int round = 1 << (shift - 1);
283 const uint8_t *scantab = h->scantable.permutated;
285 /* inverse scan and dequantization */
286 while(--coeff_num >= 0){
287 pos += run_buf[coeff_num];
289 av_log(h->s.avctx, AV_LOG_ERROR,
290 "position out of block bounds at pic %d MB(%d,%d)\n",
291 h->picture.poc, h->mbx, h->mby);
294 dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift;
299 void ff_cavs_filter(AVSContext *h, enum mb_t mb_type);
300 void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
302 void ff_cavs_load_intra_pred_chroma(AVSContext *h);
303 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
304 void ff_cavs_inter(AVSContext *h, enum mb_t mb_type);
305 void ff_cavs_mv(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC,
306 enum mv_pred_t mode, enum block_t size, int ref);
307 void ff_cavs_init_mb(AVSContext *h);
308 int ff_cavs_next_mb(AVSContext *h);
309 void ff_cavs_init_pic(AVSContext *h);
310 void ff_cavs_init_top_lines(AVSContext *h);
311 int ff_cavs_init(AVCodecContext *avctx);
312 int ff_cavs_end (AVCodecContext *avctx);
314 #endif /* AVCODEC_CAVS_H */