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cavs.h
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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 "cavsdsp.h"
26 #include "dsputil.h"
27 #include "h264chroma.h"
28 #include "get_bits.h"
29 #include "videodsp.h"
30 
31 #define SLICE_MAX_START_CODE 0x000001af
32 #define EXT_START_CODE 0x000001b5
33 #define USER_START_CODE 0x000001b2
34 #define CAVS_START_CODE 0x000001b0
35 #define PIC_I_START_CODE 0x000001b3
36 #define PIC_PB_START_CODE 0x000001b6
37 
38 #define A_AVAIL 1
39 #define B_AVAIL 2
40 #define C_AVAIL 4
41 #define D_AVAIL 8
42 #define NOT_AVAIL -1
43 #define REF_INTRA -2
44 #define REF_DIR -3
45 
46 #define ESCAPE_CODE 59
47 
48 #define FWD0 0x01
49 #define FWD1 0x02
50 #define BWD0 0x04
51 #define BWD1 0x08
52 #define SYM0 0x10
53 #define SYM1 0x20
54 #define SPLITH 0x40
55 #define SPLITV 0x80
56 
57 #define MV_BWD_OFFS 12
58 #define MV_STRIDE 4
59 
60 enum cavs_mb {
61  I_8X8 = 0,
72  B_8X8 = 29
73 };
74 
80 };
81 
91 };
92 
101 };
102 
110 };
111 
117 };
118 
140 };
141 
142 DECLARE_ALIGNED(8, typedef, struct) {
143  int16_t x;
144  int16_t y;
145  int16_t dist;
146  int16_t ref;
147 } cavs_vector;
148 
149 struct dec_2dvlc {
150  int8_t rltab[59][3];
151  int8_t level_add[27];
152  int8_t golomb_order;
154  int8_t max_run;
155 };
156 
157 typedef struct AVSFrame {
159  int poc;
160 } AVSFrame;
161 
162 typedef struct AVSContext {
169  AVSFrame cur; ///< currently decoded frame
170  AVSFrame DPB[2]; ///< reference frames
171  int dist[2]; ///< temporal distances from current frame to ref frames
176  int width, height;
177  int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder
180  int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
183  int ref_flag;
184  int mbx, mby, mbidx; ///< macroblock coordinates
185  int flags; ///< availability flags of neighbouring macroblocks
186  int stc; ///< last start code
187  uint8_t *cy, *cu, *cv; ///< current MB sample pointers
188  int left_qp;
190 
191  /** mv motion vector cache
192  0: D3 B2 B3 C2
193  4: A1 X0 X1 -
194  8: A3 X2 X3 -
195 
196  X are the vectors in the current macroblock (5,6,9,10)
197  A is the macroblock to the left (4,8)
198  B is the macroblock to the top (1,2)
199  C is the macroblock to the top-right (3)
200  D is the macroblock to the top-left (0)
201 
202  the same is repeated for backward motion vectors */
203  cavs_vector mv[2*4*3];
206 
207  /** luma pred mode cache
208  0: -- B2 B3
209  3: A1 X0 X1
210  6: A3 X2 X3 */
211  int pred_mode_Y[3*3];
213  ptrdiff_t l_stride, c_stride;
214  int luma_scan[4];
215  int qp;
216  int qp_fixed;
217  int cbp;
219 
220  /** intra prediction is done with un-deblocked samples
221  they are saved here before deblocking the MB */
226 
227  void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
228  void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
230 
231  /* scaling factors for MV prediction */
232  int sym_factor; ///< for scaling in symmetrical B block
233  int direct_den[2]; ///< for scaling in direct B block
234  int scale_den[2]; ///< for scaling neighbouring MVs
235 
237 
239  int16_t *block;
240 } AVSContext;
241 
242 extern const uint8_t ff_cavs_partition_flags[30];
243 extern const cavs_vector ff_cavs_intra_mv;
244 extern const cavs_vector ff_cavs_dir_mv;
245 
246 static inline void set_mvs(cavs_vector *mv, enum cavs_block size) {
247  switch(size) {
248  case BLK_16X16:
249  mv[MV_STRIDE ] = mv[0];
250  mv[MV_STRIDE+1] = mv[0];
251  case BLK_16X8:
252  mv[1] = mv[0];
253  break;
254  case BLK_8X16:
255  mv[MV_STRIDE] = mv[0];
256  break;
257  }
258 }
259 
260 void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type);
262  int block);
264 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
265 void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type);
266 void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
267  enum cavs_mv_pred mode, enum cavs_block size, int ref);
268 void ff_cavs_init_mb(AVSContext *h);
272 int ff_cavs_init(AVCodecContext *avctx);
273 int ff_cavs_end (AVCodecContext *avctx);
274 
275 #endif /* AVCODEC_CAVS_H */