FFmpeg
vp9lpf.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 "vp9dec.h"
25 
26 static av_always_inline void filter_plane_cols(VP9Context *s, int col, int ss_h, int ss_v,
27  uint8_t *lvl, uint8_t (*mask)[4],
28  uint8_t *dst, ptrdiff_t ls)
29 {
30  int y, x, bytesperpixel = s->bytesperpixel;
31 
32  // filter edges between columns (e.g. block1 | block2)
33  for (y = 0; y < 8; y += 2 << ss_v, dst += 16 * ls, lvl += 16 << ss_v) {
34  uint8_t *ptr = dst, *l = lvl, *hmask1 = mask[y], *hmask2 = mask[y + 1 + ss_v];
35  unsigned hm1 = hmask1[0] | hmask1[1] | hmask1[2], hm13 = hmask1[3];
36  unsigned hm2 = hmask2[1] | hmask2[2], hm23 = hmask2[3];
37  unsigned hm = hm1 | hm2 | hm13 | hm23;
38 
39  for (x = 1; hm & ~(x - 1); x <<= 1, ptr += 8 * bytesperpixel >> ss_h) {
40  if (col || x > 1) {
41  if (hm1 & x) {
42  int L = *l, H = L >> 4;
43  int E = s->filter_lut.mblim_lut[L], I = s->filter_lut.lim_lut[L];
44 
45  if (hmask1[0] & x) {
46  if (hmask2[0] & x) {
47  av_assert2(l[8 << ss_v] == L);
48  s->dsp.loop_filter_16[0](ptr, ls, E, I, H);
49  } else {
50  s->dsp.loop_filter_8[2][0](ptr, ls, E, I, H);
51  }
52  } else if (hm2 & x) {
53  L = l[8 << ss_v];
54  H |= (L >> 4) << 8;
55  E |= s->filter_lut.mblim_lut[L] << 8;
56  I |= s->filter_lut.lim_lut[L] << 8;
57  s->dsp.loop_filter_mix2[!!(hmask1[1] & x)]
58  [!!(hmask2[1] & x)]
59  [0](ptr, ls, E, I, H);
60  } else {
61  s->dsp.loop_filter_8[!!(hmask1[1] & x)]
62  [0](ptr, ls, E, I, H);
63  }
64  } else if (hm2 & x) {
65  int L = l[8 << ss_v], H = L >> 4;
66  int E = s->filter_lut.mblim_lut[L], I = s->filter_lut.lim_lut[L];
67 
68  s->dsp.loop_filter_8[!!(hmask2[1] & x)]
69  [0](ptr + 8 * ls, ls, E, I, H);
70  }
71  }
72  if (ss_h) {
73  if (x & 0xAA)
74  l += 2;
75  } else {
76  if (hm13 & x) {
77  int L = *l, H = L >> 4;
78  int E = s->filter_lut.mblim_lut[L], I = s->filter_lut.lim_lut[L];
79 
80  if (hm23 & x) {
81  L = l[8 << ss_v];
82  H |= (L >> 4) << 8;
83  E |= s->filter_lut.mblim_lut[L] << 8;
84  I |= s->filter_lut.lim_lut[L] << 8;
85  s->dsp.loop_filter_mix2[0][0][0](ptr + 4 * bytesperpixel, ls, E, I, H);
86  } else {
87  s->dsp.loop_filter_8[0][0](ptr + 4 * bytesperpixel, ls, E, I, H);
88  }
89  } else if (hm23 & x) {
90  int L = l[8 << ss_v], H = L >> 4;
91  int E = s->filter_lut.mblim_lut[L], I = s->filter_lut.lim_lut[L];
92 
93  s->dsp.loop_filter_8[0][0](ptr + 8 * ls + 4 * bytesperpixel, ls, E, I, H);
94  }
95  l++;
96  }
97  }
98  }
99 }
100 
101 static av_always_inline void filter_plane_rows(VP9Context *s, int row, int ss_h, int ss_v,
102  uint8_t *lvl, uint8_t (*mask)[4],
103  uint8_t *dst, ptrdiff_t ls)
104 {
105  int y, x, bytesperpixel = s->bytesperpixel;
106 
107  // block1
108  // filter edges between rows (e.g. ------)
109  // block2
110  for (y = 0; y < 8; y++, dst += 8 * ls >> ss_v) {
111  uint8_t *ptr = dst, *l = lvl, *vmask = mask[y];
112  unsigned vm = vmask[0] | vmask[1] | vmask[2], vm3 = vmask[3];
113 
114  for (x = 1; vm & ~(x - 1); x <<= (2 << ss_h), ptr += 16 * bytesperpixel, l += 2 << ss_h) {
115  if (row || y) {
116  if (vm & x) {
117  int L = *l, H = L >> 4;
118  int E = s->filter_lut.mblim_lut[L], I = s->filter_lut.lim_lut[L];
119 
120  if (vmask[0] & x) {
121  if (vmask[0] & (x << (1 + ss_h))) {
122  av_assert2(l[1 + ss_h] == L);
123  s->dsp.loop_filter_16[1](ptr, ls, E, I, H);
124  } else {
125  s->dsp.loop_filter_8[2][1](ptr, ls, E, I, H);
126  }
127  } else if (vm & (x << (1 + ss_h))) {
128  L = l[1 + ss_h];
129  H |= (L >> 4) << 8;
130  E |= s->filter_lut.mblim_lut[L] << 8;
131  I |= s->filter_lut.lim_lut[L] << 8;
132  s->dsp.loop_filter_mix2[!!(vmask[1] & x)]
133  [!!(vmask[1] & (x << (1 + ss_h)))]
134  [1](ptr, ls, E, I, H);
135  } else {
136  s->dsp.loop_filter_8[!!(vmask[1] & x)]
137  [1](ptr, ls, E, I, H);
138  }
139  } else if (vm & (x << (1 + ss_h))) {
140  int L = l[1 + ss_h], H = L >> 4;
141  int E = s->filter_lut.mblim_lut[L], I = s->filter_lut.lim_lut[L];
142 
143  s->dsp.loop_filter_8[!!(vmask[1] & (x << (1 + ss_h)))]
144  [1](ptr + 8 * bytesperpixel, ls, E, I, H);
145  }
146  }
147  if (!ss_v) {
148  if (vm3 & x) {
149  int L = *l, H = L >> 4;
150  int E = s->filter_lut.mblim_lut[L], I = s->filter_lut.lim_lut[L];
151 
152  if (vm3 & (x << (1 + ss_h))) {
153  L = l[1 + ss_h];
154  H |= (L >> 4) << 8;
155  E |= s->filter_lut.mblim_lut[L] << 8;
156  I |= s->filter_lut.lim_lut[L] << 8;
157  s->dsp.loop_filter_mix2[0][0][1](ptr + ls * 4, ls, E, I, H);
158  } else {
159  s->dsp.loop_filter_8[0][1](ptr + ls * 4, ls, E, I, H);
160  }
161  } else if (vm3 & (x << (1 + ss_h))) {
162  int L = l[1 + ss_h], H = L >> 4;
163  int E = s->filter_lut.mblim_lut[L], I = s->filter_lut.lim_lut[L];
164 
165  s->dsp.loop_filter_8[0][1](ptr + ls * 4 + 8 * bytesperpixel, ls, E, I, H);
166  }
167  }
168  }
169  if (ss_v) {
170  if (y & 1)
171  lvl += 16;
172  } else {
173  lvl += 8;
174  }
175  }
176 }
177 
178 void ff_vp9_loopfilter_sb(AVCodecContext *avctx, VP9Filter *lflvl,
179  int row, int col, ptrdiff_t yoff, ptrdiff_t uvoff)
180 {
181  VP9Context *s = avctx->priv_data;
182  AVFrame *f = s->s.frames[CUR_FRAME].tf.f;
183  uint8_t *dst = f->data[0] + yoff;
184  ptrdiff_t ls_y = f->linesize[0], ls_uv = f->linesize[1];
185  uint8_t (*uv_masks)[8][4] = lflvl->mask[s->ss_h | s->ss_v];
186  int p;
187 
188  /* FIXME: In how far can we interleave the v/h loopfilter calls? E.g.
189  * if you think of them as acting on a 8x8 block max, we can interleave
190  * each v/h within the single x loop, but that only works if we work on
191  * 8 pixel blocks, and we won't always do that (we want at least 16px
192  * to use SSE2 optimizations, perhaps 32 for AVX2) */
193 
194  filter_plane_cols(s, col, 0, 0, lflvl->level, lflvl->mask[0][0], dst, ls_y);
195  filter_plane_rows(s, row, 0, 0, lflvl->level, lflvl->mask[0][1], dst, ls_y);
196 
197  for (p = 0; p < 2; p++) {
198  dst = f->data[1 + p] + uvoff;
199  filter_plane_cols(s, col, s->ss_h, s->ss_v, lflvl->level, uv_masks[0], dst, ls_uv);
200  filter_plane_rows(s, row, s->ss_h, s->ss_v, lflvl->level, uv_masks[1], dst, ls_uv);
201  }
202 }
filter_plane_cols
static av_always_inline void filter_plane_cols(VP9Context *s, int col, int ss_h, int ss_v, uint8_t *lvl, uint8_t(*mask)[4], uint8_t *dst, ptrdiff_t ls)
Definition: vp9lpf.c:26
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:317
VP9Filter
Definition: vp9dec.h:76
ff_vp9_loopfilter_sb
void ff_vp9_loopfilter_sb(AVCodecContext *avctx, VP9Filter *lflvl, int row, int col, ptrdiff_t yoff, ptrdiff_t uvoff)
Definition: vp9lpf.c:178
mask
static const uint16_t mask[17]
Definition: lzw.c:38
s
#define s(width, name)
Definition: cbs_vp9.c:257
f
#define f(width, name)
Definition: cbs_vp9.c:255
E
#define E
Definition: avdct.c:32
filter_plane_rows
static av_always_inline void filter_plane_rows(VP9Context *s, int row, int ss_h, int ss_v, uint8_t *lvl, uint8_t(*mask)[4], uint8_t *dst, ptrdiff_t ls)
Definition: vp9lpf.c:101
VP9Context
Definition: vp9dec.h:94
H
#define H
Definition: pixlet.c:39
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
av_always_inline
#define av_always_inline
Definition: attributes.h:49
L
#define L(x)
Definition: vp56_arith.h:36
AVCodecContext
main external API structure.
Definition: avcodec.h:383
VP9Filter::mask
uint8_t mask[2][2][8][4]
Definition: vp9dec.h:79
vp9dec.h
CUR_FRAME
#define CUR_FRAME
Definition: vp9shared.h:163
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:410
VP9Filter::level
uint8_t level[8 *8]
Definition: vp9dec.h:77
Generated on Wed Aug 24 2022 21:38:00 for FFmpeg by   doxygen 1.8.17