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 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 
58 enum cavs_mb {
59  I_8X8 = 0,
70  B_8X8 = 29
71 };
72 
78 };
79 
89 };
90 
99 };
100 
108 };
109 
115 };
116 
138 };
139 
140 DECLARE_ALIGNED(8, typedef, struct) {
141  int16_t x;
142  int16_t y;
143  int16_t dist;
144  int16_t ref;
145 } cavs_vector;
146 
147 struct dec_2dvlc {
148  int8_t rltab[59][3];
149  int8_t level_add[27];
150  int8_t golomb_order;
152  int8_t max_run;
153 };
154 
155 typedef struct {
160  int dist[2];
163  int mb_width, mb_height;
164  int pic_type;
170  int alpha_offset, beta_offset;
171  int ref_flag;
172  int mbx, mby, mbidx;
173  int flags;
174  int stc;
175  uint8_t *cy, *cu, *cv;
176  int left_qp;
177  uint8_t *top_qp;
178 
191  cavs_vector mv[2*4*3];
192  cavs_vector *top_mv[2];
194 
199  int pred_mode_Y[3*3];
201  int l_stride, c_stride;
202  int luma_scan[4];
203  int qp;
204  int qp_fixed;
205  int cbp;
207 
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 */
221  int direct_den[2];
222  int scale_den[2];
223 
226 } AVSContext;
227 
228 extern const uint8_t ff_cavs_dequant_shift[64];
229 extern const uint16_t ff_cavs_dequant_mul[64];
230 extern const struct dec_2dvlc ff_cavs_intra_dec[7];
231 extern const struct dec_2dvlc ff_cavs_inter_dec[7];
232 extern const struct dec_2dvlc ff_cavs_chroma_dec[5];
233 extern const uint8_t ff_cavs_chroma_qp[64];
234 extern const uint8_t ff_cavs_scan3x3[4];
235 extern const uint8_t ff_cavs_partition_flags[30];
236 extern const int8_t ff_left_modifier_l[8];
237 extern const int8_t ff_top_modifier_l[8];
238 extern const int8_t ff_left_modifier_c[7];
239 extern const int8_t ff_top_modifier_c[7];
240 extern const cavs_vector ff_cavs_intra_mv;
241 extern const cavs_vector ff_cavs_un_mv;
242 extern const cavs_vector ff_cavs_dir_mv;
243 
244 static 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 
253 static 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 
263 static 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 
277 static inline void set_mv_intra(AVSContext *h) {
279  set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
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 
286 static 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) {
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 
306 void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type);
307 void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
308  int block);
310 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
311 void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type);
312 void 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);
314 void ff_cavs_init_mb(AVSContext *h);
318 int ff_cavs_init(AVCodecContext *avctx);
319 int ff_cavs_end (AVCodecContext *avctx);
320 
321 #endif /* AVCODEC_CAVS_H */