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 Libav.
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.
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.
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
22 #ifndef AVCODEC_CAVS_H
23 #define AVCODEC_CAVS_H
26 #include "mpegvideo.h"
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
80 enum cavs_intra_luma {
91 enum cavs_intra_chroma {
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];
155 typedef struct AVSContext {
158 Picture picture; ///< currently decoded frame
159 Picture DPB[2]; ///< reference frames
160 int dist[2]; ///< temporal distances from current frame to ref frames
163 int mb_width, mb_height;
165 int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder
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;
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
179 /** mv motion vector cache
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)
190 the same is repeated for backward motion vectors */
191 cavs_vector mv[2*4*3];
192 cavs_vector *top_mv[2];
195 /** luma pred mode cache
199 int pred_mode_Y[3*3];
201 int l_stride, c_stride;
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;
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;
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
228 extern const uint8_t ff_cavs_partition_flags[30];
229 extern const cavs_vector ff_cavs_intra_mv;
230 extern const cavs_vector ff_cavs_dir_mv;
232 static inline void set_mvs(cavs_vector *mv, enum cavs_block size) {
235 mv[MV_STRIDE ] = mv[0];
236 mv[MV_STRIDE+1] = mv[0];
241 mv[MV_STRIDE] = mv[0];
246 void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type);
247 void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
249 void ff_cavs_load_intra_pred_chroma(AVSContext *h);
250 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
251 void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type);
252 void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
253 enum cavs_mv_pred mode, enum cavs_block size, int ref);
254 void ff_cavs_init_mb(AVSContext *h);
255 int ff_cavs_next_mb(AVSContext *h);
256 void ff_cavs_init_pic(AVSContext *h);
257 void ff_cavs_init_top_lines(AVSContext *h);
258 int ff_cavs_init(AVCodecContext *avctx);
259 int ff_cavs_end (AVCodecContext *avctx);
261 #endif /* AVCODEC_CAVS_H */