FFmpeg
vp9prob.c
Go to the documentation of this file.
1 /*
2  * VP9 compatible video decoder
3  *
4  * Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
5  * Copyright (C) 2013 Clément Bœsch <u pkh me>
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include "vp9.h"
25 #include "vp9dec.h"
26 
27 static av_always_inline void adapt_prob(uint8_t *p, unsigned ct0, unsigned ct1,
28  int max_count, int update_factor)
29 {
30  unsigned ct = ct0 + ct1, p2, p1;
31 
32  if (!ct)
33  return;
34 
35  update_factor = FASTDIV(update_factor * FFMIN(ct, max_count), max_count);
36  p1 = *p;
37  p2 = ((((int64_t) ct0) << 8) + (ct >> 1)) / ct;
38  p2 = av_clip(p2, 1, 255);
39 
40  // (p1 * (256 - update_factor) + p2 * update_factor + 128) >> 8
41  *p = p1 + (((p2 - p1) * update_factor + 128) >> 8);
42 }
43 
44 void ff_vp9_adapt_probs(VP9Context *s)
45 {
46  int i, j, k, l, m;
47  ProbContext *p = &s->prob_ctx[s->s.h.framectxid].p;
48  int uf = (s->s.h.keyframe || s->s.h.intraonly || !s->last_keyframe) ? 112 : 128;
49 
50  // coefficients
51  for (i = 0; i < 4; i++)
52  for (j = 0; j < 2; j++)
53  for (k = 0; k < 2; k++)
54  for (l = 0; l < 6; l++)
55  for (m = 0; m < 6; m++) {
56  uint8_t *pp = s->prob_ctx[s->s.h.framectxid].coef[i][j][k][l][m];
57  unsigned *e = s->td[0].counts.eob[i][j][k][l][m];
58  unsigned *c = s->td[0].counts.coef[i][j][k][l][m];
59 
60  if (l == 0 && m >= 3) // dc only has 3 pt
61  break;
62 
63  adapt_prob(&pp[0], e[0], e[1], 24, uf);
64  adapt_prob(&pp[1], c[0], c[1] + c[2], 24, uf);
65  adapt_prob(&pp[2], c[1], c[2], 24, uf);
66  }
67 
68  if (s->s.h.keyframe || s->s.h.intraonly) {
69  memcpy(p->skip, s->prob.p.skip, sizeof(p->skip));
70  memcpy(p->tx32p, s->prob.p.tx32p, sizeof(p->tx32p));
71  memcpy(p->tx16p, s->prob.p.tx16p, sizeof(p->tx16p));
72  memcpy(p->tx8p, s->prob.p.tx8p, sizeof(p->tx8p));
73  return;
74  }
75 
76  // skip flag
77  for (i = 0; i < 3; i++)
78  adapt_prob(&p->skip[i], s->td[0].counts.skip[i][0],
79  s->td[0].counts.skip[i][1], 20, 128);
80 
81  // intra/inter flag
82  for (i = 0; i < 4; i++)
83  adapt_prob(&p->intra[i], s->td[0].counts.intra[i][0],
84  s->td[0].counts.intra[i][1], 20, 128);
85 
86  // comppred flag
87  if (s->s.h.comppredmode == PRED_SWITCHABLE) {
88  for (i = 0; i < 5; i++)
89  adapt_prob(&p->comp[i], s->td[0].counts.comp[i][0],
90  s->td[0].counts.comp[i][1], 20, 128);
91  }
92 
93  // reference frames
94  if (s->s.h.comppredmode != PRED_SINGLEREF) {
95  for (i = 0; i < 5; i++)
96  adapt_prob(&p->comp_ref[i], s->td[0].counts.comp_ref[i][0],
97  s->td[0].counts.comp_ref[i][1], 20, 128);
98  }
99 
100  if (s->s.h.comppredmode != PRED_COMPREF) {
101  for (i = 0; i < 5; i++) {
102  uint8_t *pp = p->single_ref[i];
103  unsigned (*c)[2] = s->td[0].counts.single_ref[i];
104 
105  adapt_prob(&pp[0], c[0][0], c[0][1], 20, 128);
106  adapt_prob(&pp[1], c[1][0], c[1][1], 20, 128);
107  }
108  }
109 
110  // block partitioning
111  for (i = 0; i < 4; i++)
112  for (j = 0; j < 4; j++) {
113  uint8_t *pp = p->partition[i][j];
114  unsigned *c = s->td[0].counts.partition[i][j];
115 
116  adapt_prob(&pp[0], c[0], c[1] + c[2] + c[3], 20, 128);
117  adapt_prob(&pp[1], c[1], c[2] + c[3], 20, 128);
118  adapt_prob(&pp[2], c[2], c[3], 20, 128);
119  }
120 
121  // tx size
122  if (s->s.h.txfmmode == TX_SWITCHABLE) {
123  for (i = 0; i < 2; i++) {
124  unsigned *c16 = s->td[0].counts.tx16p[i], *c32 = s->td[0].counts.tx32p[i];
125 
126  adapt_prob(&p->tx8p[i], s->td[0].counts.tx8p[i][0],
127  s->td[0].counts.tx8p[i][1], 20, 128);
128  adapt_prob(&p->tx16p[i][0], c16[0], c16[1] + c16[2], 20, 128);
129  adapt_prob(&p->tx16p[i][1], c16[1], c16[2], 20, 128);
130  adapt_prob(&p->tx32p[i][0], c32[0], c32[1] + c32[2] + c32[3], 20, 128);
131  adapt_prob(&p->tx32p[i][1], c32[1], c32[2] + c32[3], 20, 128);
132  adapt_prob(&p->tx32p[i][2], c32[2], c32[3], 20, 128);
133  }
134  }
135 
136  // interpolation filter
137  if (s->s.h.filtermode == FILTER_SWITCHABLE) {
138  for (i = 0; i < 4; i++) {
139  uint8_t *pp = p->filter[i];
140  unsigned *c = s->td[0].counts.filter[i];
141 
142  adapt_prob(&pp[0], c[0], c[1] + c[2], 20, 128);
143  adapt_prob(&pp[1], c[1], c[2], 20, 128);
144  }
145  }
146 
147  // inter modes
148  for (i = 0; i < 7; i++) {
149  uint8_t *pp = p->mv_mode[i];
150  unsigned *c = s->td[0].counts.mv_mode[i];
151 
152  adapt_prob(&pp[0], c[2], c[1] + c[0] + c[3], 20, 128);
153  adapt_prob(&pp[1], c[0], c[1] + c[3], 20, 128);
154  adapt_prob(&pp[2], c[1], c[3], 20, 128);
155  }
156 
157  // mv joints
158  {
159  uint8_t *pp = p->mv_joint;
160  unsigned *c = s->td[0].counts.mv_joint;
161 
162  adapt_prob(&pp[0], c[0], c[1] + c[2] + c[3], 20, 128);
163  adapt_prob(&pp[1], c[1], c[2] + c[3], 20, 128);
164  adapt_prob(&pp[2], c[2], c[3], 20, 128);
165  }
166 
167  // mv components
168  for (i = 0; i < 2; i++) {
169  uint8_t *pp;
170  unsigned *c, (*c2)[2], sum;
171 
172  adapt_prob(&p->mv_comp[i].sign, s->td[0].counts.mv_comp[i].sign[0],
173  s->td[0].counts.mv_comp[i].sign[1], 20, 128);
174 
175  pp = p->mv_comp[i].classes;
176  c = s->td[0].counts.mv_comp[i].classes;
177  sum = c[1] + c[2] + c[3] + c[4] + c[5] +
178  c[6] + c[7] + c[8] + c[9] + c[10];
179  adapt_prob(&pp[0], c[0], sum, 20, 128);
180  sum -= c[1];
181  adapt_prob(&pp[1], c[1], sum, 20, 128);
182  sum -= c[2] + c[3];
183  adapt_prob(&pp[2], c[2] + c[3], sum, 20, 128);
184  adapt_prob(&pp[3], c[2], c[3], 20, 128);
185  sum -= c[4] + c[5];
186  adapt_prob(&pp[4], c[4] + c[5], sum, 20, 128);
187  adapt_prob(&pp[5], c[4], c[5], 20, 128);
188  sum -= c[6];
189  adapt_prob(&pp[6], c[6], sum, 20, 128);
190  adapt_prob(&pp[7], c[7] + c[8], c[9] + c[10], 20, 128);
191  adapt_prob(&pp[8], c[7], c[8], 20, 128);
192  adapt_prob(&pp[9], c[9], c[10], 20, 128);
193 
194  adapt_prob(&p->mv_comp[i].class0, s->td[0].counts.mv_comp[i].class0[0],
195  s->td[0].counts.mv_comp[i].class0[1], 20, 128);
196  pp = p->mv_comp[i].bits;
197  c2 = s->td[0].counts.mv_comp[i].bits;
198  for (j = 0; j < 10; j++)
199  adapt_prob(&pp[j], c2[j][0], c2[j][1], 20, 128);
200 
201  for (j = 0; j < 2; j++) {
202  pp = p->mv_comp[i].class0_fp[j];
203  c = s->td[0].counts.mv_comp[i].class0_fp[j];
204  adapt_prob(&pp[0], c[0], c[1] + c[2] + c[3], 20, 128);
205  adapt_prob(&pp[1], c[1], c[2] + c[3], 20, 128);
206  adapt_prob(&pp[2], c[2], c[3], 20, 128);
207  }
208  pp = p->mv_comp[i].fp;
209  c = s->td[0].counts.mv_comp[i].fp;
210  adapt_prob(&pp[0], c[0], c[1] + c[2] + c[3], 20, 128);
211  adapt_prob(&pp[1], c[1], c[2] + c[3], 20, 128);
212  adapt_prob(&pp[2], c[2], c[3], 20, 128);
213 
214  if (s->s.h.highprecisionmvs) {
215  adapt_prob(&p->mv_comp[i].class0_hp,
216  s->td[0].counts.mv_comp[i].class0_hp[0],
217  s->td[0].counts.mv_comp[i].class0_hp[1], 20, 128);
218  adapt_prob(&p->mv_comp[i].hp, s->td[0].counts.mv_comp[i].hp[0],
219  s->td[0].counts.mv_comp[i].hp[1], 20, 128);
220  }
221  }
222 
223  // y intra modes
224  for (i = 0; i < 4; i++) {
225  uint8_t *pp = p->y_mode[i];
226  unsigned *c = s->td[0].counts.y_mode[i], sum, s2;
227 
228  sum = c[0] + c[1] + c[3] + c[4] + c[5] + c[6] + c[7] + c[8] + c[9];
229  adapt_prob(&pp[0], c[DC_PRED], sum, 20, 128);
230  sum -= c[TM_VP8_PRED];
231  adapt_prob(&pp[1], c[TM_VP8_PRED], sum, 20, 128);
232  sum -= c[VERT_PRED];
233  adapt_prob(&pp[2], c[VERT_PRED], sum, 20, 128);
234  s2 = c[HOR_PRED] + c[DIAG_DOWN_RIGHT_PRED] + c[VERT_RIGHT_PRED];
235  sum -= s2;
236  adapt_prob(&pp[3], s2, sum, 20, 128);
237  s2 -= c[HOR_PRED];
238  adapt_prob(&pp[4], c[HOR_PRED], s2, 20, 128);
239  adapt_prob(&pp[5], c[DIAG_DOWN_RIGHT_PRED], c[VERT_RIGHT_PRED],
240  20, 128);
241  sum -= c[DIAG_DOWN_LEFT_PRED];
242  adapt_prob(&pp[6], c[DIAG_DOWN_LEFT_PRED], sum, 20, 128);
243  sum -= c[VERT_LEFT_PRED];
244  adapt_prob(&pp[7], c[VERT_LEFT_PRED], sum, 20, 128);
245  adapt_prob(&pp[8], c[HOR_DOWN_PRED], c[HOR_UP_PRED], 20, 128);
246  }
247 
248  // uv intra modes
249  for (i = 0; i < 10; i++) {
250  uint8_t *pp = p->uv_mode[i];
251  unsigned *c = s->td[0].counts.uv_mode[i], sum, s2;
252 
253  sum = c[0] + c[1] + c[3] + c[4] + c[5] + c[6] + c[7] + c[8] + c[9];
254  adapt_prob(&pp[0], c[DC_PRED], sum, 20, 128);
255  sum -= c[TM_VP8_PRED];
256  adapt_prob(&pp[1], c[TM_VP8_PRED], sum, 20, 128);
257  sum -= c[VERT_PRED];
258  adapt_prob(&pp[2], c[VERT_PRED], sum, 20, 128);
259  s2 = c[HOR_PRED] + c[DIAG_DOWN_RIGHT_PRED] + c[VERT_RIGHT_PRED];
260  sum -= s2;
261  adapt_prob(&pp[3], s2, sum, 20, 128);
262  s2 -= c[HOR_PRED];
263  adapt_prob(&pp[4], c[HOR_PRED], s2, 20, 128);
264  adapt_prob(&pp[5], c[DIAG_DOWN_RIGHT_PRED], c[VERT_RIGHT_PRED],
265  20, 128);
266  sum -= c[DIAG_DOWN_LEFT_PRED];
267  adapt_prob(&pp[6], c[DIAG_DOWN_LEFT_PRED], sum, 20, 128);
268  sum -= c[VERT_LEFT_PRED];
269  adapt_prob(&pp[7], c[VERT_LEFT_PRED], sum, 20, 128);
270  adapt_prob(&pp[8], c[HOR_DOWN_PRED], c[HOR_UP_PRED], 20, 128);
271  }
272 }
ProbContext::class0_fp
uint8_t class0_fp[2][3]
Definition: vp9dec.h:71
av_clip
#define av_clip
Definition: common.h:95
PRED_SWITCHABLE
@ PRED_SWITCHABLE
Definition: vp9shared.h:52
PRED_SINGLEREF
@ PRED_SINGLEREF
Definition: vp9shared.h:50
ProbContext::classes
uint8_t classes[10]
Definition: vp9dec.h:68
PRED_COMPREF
@ PRED_COMPREF
Definition: vp9shared.h:51
TM_VP8_PRED
@ TM_VP8_PRED
Definition: vp9.h:55
ProbContext::mv_comp
struct ProbContext::@187 mv_comp[2]
DC_PRED
@ DC_PRED
Definition: vp9.h:48
VERT_LEFT_PRED
@ VERT_LEFT_PRED
Definition: vp9.h:53
ProbContext::hp
uint8_t hp
Definition: vp9dec.h:74
ProbContext::tx32p
uint8_t tx32p[2][3]
Definition: vp9dec.h:61
ProbContext::comp
uint8_t comp[5]
Definition: vp9dec.h:58
FILTER_SWITCHABLE
@ FILTER_SWITCHABLE
Definition: vp9.h:70
ProbContext::sign
uint8_t sign
Definition: vp9dec.h:67
TX_SWITCHABLE
@ TX_SWITCHABLE
Definition: vp9.h:33
VERT_PRED
@ VERT_PRED
Definition: vp9.h:46
DIAG_DOWN_RIGHT_PRED
@ DIAG_DOWN_RIGHT_PRED
Definition: vp9.h:50
ProbContext::y_mode
uint8_t y_mode[4][9]
Definition: vp9dec.h:53
HOR_PRED
@ HOR_PRED
Definition: vp9.h:47
s
#define s(width, name)
Definition: cbs_vp9.c:256
VP9Context
Definition: vp9dec.h:97
FASTDIV
#define FASTDIV(a, b)
Definition: mathops.h:205
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
ProbContext::bits
uint8_t bits[10]
Definition: vp9dec.h:70
s2
#define s2
Definition: regdef.h:39
vp9.h
ProbContext::skip
uint8_t skip[3]
Definition: vp9dec.h:64
ProbContext::mv_mode
uint8_t mv_mode[7][3]
Definition: vp9dec.h:56
VERT_RIGHT_PRED
@ VERT_RIGHT_PRED
Definition: vp9.h:51
ProbContext::comp_ref
uint8_t comp_ref[5]
Definition: vp9dec.h:60
ProbContext
Definition: vp9dec.h:52
ProbContext::fp
uint8_t fp[3]
Definition: vp9dec.h:72
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
av_always_inline
#define av_always_inline
Definition: attributes.h:49
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
ProbContext::class0_hp
uint8_t class0_hp
Definition: vp9dec.h:73
ProbContext::single_ref
uint8_t single_ref[5][2]
Definition: vp9dec.h:59
ProbContext::tx16p
uint8_t tx16p[2][2]
Definition: vp9dec.h:62
c2
static const uint64_t c2
Definition: murmur3.c:52
HOR_UP_PRED
@ HOR_UP_PRED
Definition: vp9.h:54
ProbContext::partition
uint8_t partition[4][4][3]
Definition: vp9dec.h:76
ProbContext::mv_joint
uint8_t mv_joint[3]
Definition: vp9dec.h:65
HOR_DOWN_PRED
@ HOR_DOWN_PRED
Definition: vp9.h:52
ProbContext::filter
uint8_t filter[4][2]
Definition: vp9dec.h:55
vp9dec.h
ProbContext::tx8p
uint8_t tx8p[2]
Definition: vp9dec.h:63
ProbContext::class0
uint8_t class0
Definition: vp9dec.h:69
ProbContext::uv_mode
uint8_t uv_mode[10][9]
Definition: vp9dec.h:54
DIAG_DOWN_LEFT_PRED
@ DIAG_DOWN_LEFT_PRED
Definition: vp9.h:49
ff_vp9_adapt_probs
void ff_vp9_adapt_probs(VP9Context *s)
Definition: vp9prob.c:44
adapt_prob
static av_always_inline void adapt_prob(uint8_t *p, unsigned ct0, unsigned ct1, int max_count, int update_factor)
Definition: vp9prob.c:27
ProbContext::intra
uint8_t intra[4]
Definition: vp9dec.h:57
Generated on Thu Oct 6 2022 19:21:20 for FFmpeg by   doxygen 1.8.17