FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_deblock.c
Date: 2024-04-19 17:50:32
Exec Total Coverage
Lines: 0 87 0.0%
Functions: 0 11 0.0%
Branches: 0 112 0.0%

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1 /*
2 * Copyright (c) 2018 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /*
22 * Based on paper: A Simple and Efficient Deblocking Algorithm for Low Bit-Rate Video Coding.
23 */
24
25 #include "libavutil/imgutils.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
28
29 #include "avfilter.h"
30 #include "internal.h"
31 #include "video.h"
32
33 enum FilterType { WEAK, STRONG, NB_FILTER };
34
35 typedef struct DeblockContext {
36 const AVClass *class;
37 const AVPixFmtDescriptor *desc;
38 int filter;
39 int block;
40 int planes;
41 float alpha;
42 float beta;
43 float gamma;
44 float delta;
45
46 int ath;
47 int bth;
48 int gth;
49 int dth;
50 int max;
51 int depth;
52 int bpc;
53 int nb_planes;
54 int planewidth[4];
55 int planeheight[4];
56
57 void (*deblockh)(uint8_t *dst, ptrdiff_t dst_linesize, int block,
58 int ath, int bth, int gth, int dth, int max);
59 void (*deblockv)(uint8_t *dst, ptrdiff_t dst_linesize, int block,
60 int ath, int bth, int gth, int dth, int max);
61 } DeblockContext;
62
63 static const enum AVPixelFormat pixel_fmts[] = {
64 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
65 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
66 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
67 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
68 AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
69 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
70 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
71 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
72 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
73 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
74 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
75 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
76 AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
77 AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
78 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
79 AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
80 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
81 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
82 AV_PIX_FMT_NONE
83 };
84
85 #define WEAK_HFILTER(name, type, ldiv) \
86 static void deblockh##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
87 int ath, int bth, int gth, int dth, int max) \
88 { \
89 type *dst; \
90 int x; \
91 \
92 dst = (type *)dstp; \
93 dst_linesize /= ldiv; \
94 \
95 for (x = 0; x < block; x++) { \
96 int delta = dst[x] - dst[x - dst_linesize]; \
97 int A, B, C, D, a, b, c, d; \
98 \
99 if (FFABS(delta) >= ath || \
100 FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
101 FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= gth) \
102 continue; \
103 \
104 A = dst[x - 2 * dst_linesize]; \
105 B = dst[x - 1 * dst_linesize]; \
106 C = dst[x + 0 * dst_linesize]; \
107 D = dst[x + 1 * dst_linesize]; \
108 \
109 a = A + delta / 8; \
110 b = B + delta / 2; \
111 c = C - delta / 2; \
112 d = D - delta / 8; \
113 \
114 dst[x - 2 * dst_linesize] = av_clip(a, 0, max); \
115 dst[x - 1 * dst_linesize] = av_clip(b, 0, max); \
116 dst[x + 0 * dst_linesize] = av_clip(c, 0, max); \
117 dst[x + 1 * dst_linesize] = av_clip(d, 0, max); \
118 } \
119 }
120
121 WEAK_HFILTER(8, uint8_t, 1)
122 WEAK_HFILTER(16, uint16_t, 2)
123
124 #define WEAK_VFILTER(name, type, ldiv) \
125 static void deblockv##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
126 int ath, int bth, int gth, int dth, int max) \
127 { \
128 type *dst; \
129 int y; \
130 \
131 dst = (type *)dstp; \
132 dst_linesize /= ldiv; \
133 \
134 for (y = 0; y < block; y++) { \
135 int delta = dst[0] - dst[-1]; \
136 int A, B, C, D, a, b, c, d; \
137 \
138 if (FFABS(delta) >= ath || \
139 FFABS(dst[-1] - dst[-2]) >= bth || \
140 FFABS(dst[0] - dst[1]) >= gth) \
141 continue; \
142 \
143 A = dst[-2]; \
144 B = dst[-1]; \
145 C = dst[+0]; \
146 D = dst[+1]; \
147 \
148 a = A + delta / 8; \
149 b = B + delta / 2; \
150 c = C - delta / 2; \
151 d = D - delta / 8; \
152 \
153 dst[-2] = av_clip(a, 0, max); \
154 dst[-1] = av_clip(b, 0, max); \
155 dst[+0] = av_clip(c, 0, max); \
156 dst[+1] = av_clip(d, 0, max); \
157 \
158 dst += dst_linesize; \
159 } \
160 }
161
162 WEAK_VFILTER(8, uint8_t, 1)
163 WEAK_VFILTER(16, uint16_t, 2)
164
165 #define STRONG_HFILTER(name, type, ldiv) \
166 static void deblockh##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
167 int ath, int bth, int gth, int dth, int max) \
168 { \
169 type *dst; \
170 int x; \
171 \
172 dst = (type *)dstp; \
173 dst_linesize /= ldiv; \
174 \
175 for (x = 0; x < block; x++) { \
176 int A, B, C, D, E, F, a, b, c, d, e, f; \
177 int delta = dst[x] - dst[x - dst_linesize]; \
178 \
179 if (FFABS(delta) >= ath || \
180 FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
181 FFABS(dst[x + 1 * dst_linesize] - dst[x + 2 * dst_linesize]) >= gth || \
182 FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= dth) \
183 continue; \
184 \
185 A = dst[x - 3 * dst_linesize]; \
186 B = dst[x - 2 * dst_linesize]; \
187 C = dst[x - 1 * dst_linesize]; \
188 D = dst[x + 0 * dst_linesize]; \
189 E = dst[x + 1 * dst_linesize]; \
190 F = dst[x + 2 * dst_linesize]; \
191 \
192 a = A + delta / 8; \
193 b = B + delta / 4; \
194 c = C + delta / 2; \
195 d = D - delta / 2; \
196 e = E - delta / 4; \
197 f = F - delta / 8; \
198 \
199 dst[x - 3 * dst_linesize] = av_clip(a, 0, max); \
200 dst[x - 2 * dst_linesize] = av_clip(b, 0, max); \
201 dst[x - 1 * dst_linesize] = av_clip(c, 0, max); \
202 dst[x + 0 * dst_linesize] = av_clip(d, 0, max); \
203 dst[x + 1 * dst_linesize] = av_clip(e, 0, max); \
204 dst[x + 2 * dst_linesize] = av_clip(f, 0, max); \
205 } \
206 }
207
208 STRONG_HFILTER(8, uint8_t, 1)
209 STRONG_HFILTER(16, uint16_t, 2)
210
211 #define STRONG_VFILTER(name, type, ldiv) \
212 static void deblockv##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
213 int ath, int bth, int gth, int dth, int max) \
214 { \
215 type *dst; \
216 int y; \
217 \
218 dst = (type *)dstp; \
219 dst_linesize /= ldiv; \
220 \
221 for (y = 0; y < block; y++) { \
222 int A, B, C, D, E, F, a, b, c, d, e, f; \
223 int delta = dst[0] - dst[-1]; \
224 \
225 if (FFABS(delta) >= ath || \
226 FFABS(dst[-1] - dst[-2]) >= bth || \
227 FFABS(dst[+1] - dst[+2]) >= gth || \
228 FFABS(dst[+0] - dst[+1]) >= dth) \
229 continue; \
230 \
231 A = dst[-3]; \
232 B = dst[-2]; \
233 C = dst[-1]; \
234 D = dst[+0]; \
235 E = dst[+1]; \
236 F = dst[+2]; \
237 \
238 a = A + delta / 8; \
239 b = B + delta / 4; \
240 c = C + delta / 2; \
241 d = D - delta / 2; \
242 e = E - delta / 4; \
243 f = F - delta / 8; \
244 \
245 dst[-3] = av_clip(a, 0, max); \
246 dst[-2] = av_clip(b, 0, max); \
247 dst[-1] = av_clip(c, 0, max); \
248 dst[+0] = av_clip(d, 0, max); \
249 dst[+1] = av_clip(e, 0, max); \
250 dst[+2] = av_clip(f, 0, max); \
251 \
252 dst += dst_linesize; \
253 } \
254 }
255
256 STRONG_VFILTER(8, uint8_t, 1)
257 STRONG_VFILTER(16, uint16_t, 2)
258
259 static int config_output(AVFilterLink *outlink)
260 {
261 AVFilterContext *ctx = outlink->src;
262 DeblockContext *s = ctx->priv;
263 AVFilterLink *inlink = ctx->inputs[0];
264
265 s->desc = av_pix_fmt_desc_get(outlink->format);
266 if (!s->desc)
267 return AVERROR_BUG;
268 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
269 s->depth = s->desc->comp[0].depth;
270 s->bpc = (s->depth + 7) / 8;
271 s->max = (1 << s->depth) - 1;
272 s->ath = s->alpha * s->max;
273 s->bth = s->beta * s->max;
274 s->gth = s->gamma * s->max;
275 s->dth = s->delta * s->max;
276
277 if (s->depth <= 8 && s->filter == WEAK) {
278 s->deblockh = deblockh8_weak;
279 s->deblockv = deblockv8_weak;
280 } else if (s->depth > 8 && s->filter == WEAK) {
281 s->deblockh = deblockh16_weak;
282 s->deblockv = deblockv16_weak;
283 }
284 if (s->depth <= 8 && s->filter == STRONG) {
285 s->deblockh = deblockh8_strong;
286 s->deblockv = deblockv8_strong;
287 } else if (s->depth > 8 && s->filter == STRONG) {
288 s->deblockh = deblockh16_strong;
289 s->deblockv = deblockv16_strong;
290 }
291
292 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
293 s->planewidth[0] = s->planewidth[3] = inlink->w;
294
295 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
296 s->planeheight[0] = s->planeheight[3] = inlink->h;
297
298 return 0;
299 }
300
301 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
302 {
303 AVFilterContext *ctx = inlink->dst;
304 AVFilterLink *outlink = ctx->outputs[0];
305 DeblockContext *s = ctx->priv;
306 const int block = s->block;
307 AVFrame *out;
308 int plane, x, y;
309
310 if (av_frame_is_writable(in)) {
311 out = in;
312 } else {
313 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
314 if (!out) {
315 av_frame_free(&in);
316 return AVERROR(ENOMEM);
317 }
318 av_frame_copy_props(out, in);
319 }
320
321 for (plane = 0; plane < s->nb_planes; plane++) {
322 const int width = s->planewidth[plane];
323 const int height = s->planeheight[plane];
324 const uint8_t *src = (const uint8_t *)in->data[plane];
325 uint8_t *dst = (uint8_t *)out->data[plane];
326
327 if (in != out)
328 av_image_copy_plane(dst, out->linesize[plane],
329 src, in->linesize[plane],
330 width * s->bpc, height);
331
332 if (!((1 << plane) & s->planes))
333 continue;
334
335 for (x = block; x < width; x += block)
336 s->deblockv(dst + x * s->bpc, out->linesize[plane],
337 FFMIN(block, height), s->ath, s->bth, s->gth, s->dth, s->max);
338
339 for (y = block; y < height - block; y += block) {
340 dst += out->linesize[plane] * block;
341
342 s->deblockh(dst, out->linesize[plane],
343 FFMIN(block, width),
344 s->ath, s->bth, s->gth, s->dth, s->max);
345
346 for (x = block; x < width; x += block) {
347 s->deblockh(dst + x * s->bpc, out->linesize[plane],
348 FFMIN(block, width - x),
349 s->ath, s->bth, s->gth, s->dth, s->max);
350 s->deblockv(dst + x * s->bpc, out->linesize[plane],
351 FFMIN(block, height - y),
352 s->ath, s->bth, s->gth, s->dth, s->max);
353 }
354 }
355
356 dst += out->linesize[plane] * block;
357 for (x = block; x < width; x += block)
358 s->deblockv(dst + x * s->bpc, out->linesize[plane],
359 FFMIN(block, height - y), s->ath, s->bth, s->gth, s->dth, s->max);
360
361 }
362
363 if (in != out)
364 av_frame_free(&in);
365 return ff_filter_frame(outlink, out);
366 }
367
368 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
369 char *res, int res_len, int flags)
370 {
371 int ret;
372
373 ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
374 if (ret < 0)
375 return ret;
376
377 return config_output(ctx->outputs[0]);
378 }
379
380 #define OFFSET(x) offsetof(DeblockContext, x)
381 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
382
383 static const AVOption deblock_options[] = {
384 { "filter", "set type of filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=STRONG},0, 1, FLAGS, .unit = "filter" },
385 { "weak", 0, 0, AV_OPT_TYPE_CONST, {.i64=WEAK}, 0, 0, FLAGS, .unit = "filter" },
386 { "strong", 0, 0, AV_OPT_TYPE_CONST, {.i64=STRONG},0, 0, FLAGS, .unit = "filter" },
387 { "block", "set size of block", OFFSET(block), AV_OPT_TYPE_INT, {.i64=8}, 4, 512, FLAGS },
388 { "alpha", "set 1st detection threshold", OFFSET(alpha), AV_OPT_TYPE_FLOAT, {.dbl=.098}, 0, 1, FLAGS },
389 { "beta", "set 2nd detection threshold", OFFSET(beta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
390 { "gamma", "set 3rd detection threshold", OFFSET(gamma), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
391 { "delta", "set 4th detection threshold", OFFSET(delta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
392 { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=15}, 0, 15, FLAGS },
393 { NULL },
394 };
395
396 static const AVFilterPad inputs[] = {
397 {
398 .name = "default",
399 .type = AVMEDIA_TYPE_VIDEO,
400 .filter_frame = filter_frame,
401 },
402 };
403
404 static const AVFilterPad outputs[] = {
405 {
406 .name = "default",
407 .type = AVMEDIA_TYPE_VIDEO,
408 .config_props = config_output,
409 },
410 };
411
412 AVFILTER_DEFINE_CLASS(deblock);
413
414 const AVFilter ff_vf_deblock = {
415 .name = "deblock",
416 .description = NULL_IF_CONFIG_SMALL("Deblock video."),
417 .priv_size = sizeof(DeblockContext),
418 .priv_class = &deblock_class,
419 FILTER_INPUTS(inputs),
420 FILTER_OUTPUTS(outputs),
421 FILTER_PIXFMTS_ARRAY(pixel_fmts),
422 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
423 .process_command = process_command,
424 };
425