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 "formats.h"
31 #include "internal.h"
32 #include "video.h"
33
34 enum FilterType { WEAK, STRONG, NB_FILTER };
35
36 typedef struct DeblockContext {
37 const AVClass *class;
38 const AVPixFmtDescriptor *desc;
39 int filter;
40 int block;
41 int planes;
42 float alpha;
43 float beta;
44 float gamma;
45 float delta;
46
47 int ath;
48 int bth;
49 int gth;
50 int dth;
51 int max;
52 int depth;
53 int bpc;
54 int nb_planes;
55 int planewidth[4];
56 int planeheight[4];
57
58 void (*deblockh)(uint8_t *dst, ptrdiff_t dst_linesize, int block,
59 int ath, int bth, int gth, int dth, int max);
60 void (*deblockv)(uint8_t *dst, ptrdiff_t dst_linesize, int block,
61 int ath, int bth, int gth, int dth, int max);
62 } DeblockContext;
63
64 static const enum AVPixelFormat pixel_fmts[] = {
65 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
66 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
67 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
68 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
69 AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
70 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
71 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
72 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
73 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
74 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
75 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
76 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
77 AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
78 AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
79 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
80 AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
81 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
82 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
83 AV_PIX_FMT_NONE
84 };
85
86 #define WEAK_HFILTER(name, type, ldiv) \
87 static void deblockh##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
88 int ath, int bth, int gth, int dth, int max) \
89 { \
90 type *dst; \
91 int x; \
92 \
93 dst = (type *)dstp; \
94 dst_linesize /= ldiv; \
95 \
96 for (x = 0; x < block; x++) { \
97 int delta = dst[x] - dst[x - dst_linesize]; \
98 int A, B, C, D, a, b, c, d; \
99 \
100 if (FFABS(delta) >= ath || \
101 FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
102 FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= gth) \
103 continue; \
104 \
105 A = dst[x - 2 * dst_linesize]; \
106 B = dst[x - 1 * dst_linesize]; \
107 C = dst[x + 0 * dst_linesize]; \
108 D = dst[x + 1 * dst_linesize]; \
109 \
110 a = A + delta / 8; \
111 b = B + delta / 2; \
112 c = C - delta / 2; \
113 d = D - delta / 8; \
114 \
115 dst[x - 2 * dst_linesize] = av_clip(a, 0, max); \
116 dst[x - 1 * dst_linesize] = av_clip(b, 0, max); \
117 dst[x + 0 * dst_linesize] = av_clip(c, 0, max); \
118 dst[x + 1 * dst_linesize] = av_clip(d, 0, max); \
119 } \
120 }
121
122 WEAK_HFILTER(8, uint8_t, 1)
123 WEAK_HFILTER(16, uint16_t, 2)
124
125 #define WEAK_VFILTER(name, type, ldiv) \
126 static void deblockv##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
127 int ath, int bth, int gth, int dth, int max) \
128 { \
129 type *dst; \
130 int y; \
131 \
132 dst = (type *)dstp; \
133 dst_linesize /= ldiv; \
134 \
135 for (y = 0; y < block; y++) { \
136 int delta = dst[0] - dst[-1]; \
137 int A, B, C, D, a, b, c, d; \
138 \
139 if (FFABS(delta) >= ath || \
140 FFABS(dst[-1] - dst[-2]) >= bth || \
141 FFABS(dst[0] - dst[1]) >= gth) \
142 continue; \
143 \
144 A = dst[-2]; \
145 B = dst[-1]; \
146 C = dst[+0]; \
147 D = dst[+1]; \
148 \
149 a = A + delta / 8; \
150 b = B + delta / 2; \
151 c = C - delta / 2; \
152 d = D - delta / 8; \
153 \
154 dst[-2] = av_clip(a, 0, max); \
155 dst[-1] = av_clip(b, 0, max); \
156 dst[+0] = av_clip(c, 0, max); \
157 dst[+1] = av_clip(d, 0, max); \
158 \
159 dst += dst_linesize; \
160 } \
161 }
162
163 WEAK_VFILTER(8, uint8_t, 1)
164 WEAK_VFILTER(16, uint16_t, 2)
165
166 #define STRONG_HFILTER(name, type, ldiv) \
167 static void deblockh##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
168 int ath, int bth, int gth, int dth, int max) \
169 { \
170 type *dst; \
171 int x; \
172 \
173 dst = (type *)dstp; \
174 dst_linesize /= ldiv; \
175 \
176 for (x = 0; x < block; x++) { \
177 int A, B, C, D, E, F, a, b, c, d, e, f; \
178 int delta = dst[x] - dst[x - dst_linesize]; \
179 \
180 if (FFABS(delta) >= ath || \
181 FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
182 FFABS(dst[x + 1 * dst_linesize] - dst[x + 2 * dst_linesize]) >= gth || \
183 FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= dth) \
184 continue; \
185 \
186 A = dst[x - 3 * dst_linesize]; \
187 B = dst[x - 2 * dst_linesize]; \
188 C = dst[x - 1 * dst_linesize]; \
189 D = dst[x + 0 * dst_linesize]; \
190 E = dst[x + 1 * dst_linesize]; \
191 F = dst[x + 2 * dst_linesize]; \
192 \
193 a = A + delta / 8; \
194 b = B + delta / 4; \
195 c = C + delta / 2; \
196 d = D - delta / 2; \
197 e = E - delta / 4; \
198 f = F - delta / 8; \
199 \
200 dst[x - 3 * dst_linesize] = av_clip(a, 0, max); \
201 dst[x - 2 * dst_linesize] = av_clip(b, 0, max); \
202 dst[x - 1 * dst_linesize] = av_clip(c, 0, max); \
203 dst[x + 0 * dst_linesize] = av_clip(d, 0, max); \
204 dst[x + 1 * dst_linesize] = av_clip(e, 0, max); \
205 dst[x + 2 * dst_linesize] = av_clip(f, 0, max); \
206 } \
207 }
208
209 STRONG_HFILTER(8, uint8_t, 1)
210 STRONG_HFILTER(16, uint16_t, 2)
211
212 #define STRONG_VFILTER(name, type, ldiv) \
213 static void deblockv##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
214 int ath, int bth, int gth, int dth, int max) \
215 { \
216 type *dst; \
217 int y; \
218 \
219 dst = (type *)dstp; \
220 dst_linesize /= ldiv; \
221 \
222 for (y = 0; y < block; y++) { \
223 int A, B, C, D, E, F, a, b, c, d, e, f; \
224 int delta = dst[0] - dst[-1]; \
225 \
226 if (FFABS(delta) >= ath || \
227 FFABS(dst[-1] - dst[-2]) >= bth || \
228 FFABS(dst[+1] - dst[+2]) >= gth || \
229 FFABS(dst[+0] - dst[+1]) >= dth) \
230 continue; \
231 \
232 A = dst[-3]; \
233 B = dst[-2]; \
234 C = dst[-1]; \
235 D = dst[+0]; \
236 E = dst[+1]; \
237 F = dst[+2]; \
238 \
239 a = A + delta / 8; \
240 b = B + delta / 4; \
241 c = C + delta / 2; \
242 d = D - delta / 2; \
243 e = E - delta / 4; \
244 f = F - delta / 8; \
245 \
246 dst[-3] = av_clip(a, 0, max); \
247 dst[-2] = av_clip(b, 0, max); \
248 dst[-1] = av_clip(c, 0, max); \
249 dst[+0] = av_clip(d, 0, max); \
250 dst[+1] = av_clip(e, 0, max); \
251 dst[+2] = av_clip(f, 0, max); \
252 \
253 dst += dst_linesize; \
254 } \
255 }
256
257 STRONG_VFILTER(8, uint8_t, 1)
258 STRONG_VFILTER(16, uint16_t, 2)
259
config_output(AVFilterLink * outlink)260 static int config_output(AVFilterLink *outlink)
261 {
262 AVFilterContext *ctx = outlink->src;
263 DeblockContext *s = ctx->priv;
264 AVFilterLink *inlink = ctx->inputs[0];
265
266 s->desc = av_pix_fmt_desc_get(outlink->format);
267 if (!s->desc)
268 return AVERROR_BUG;
269 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
270 s->depth = s->desc->comp[0].depth;
271 s->bpc = (s->depth + 7) / 8;
272 s->max = (1 << s->depth) - 1;
273 s->ath = s->alpha * s->max;
274 s->bth = s->beta * s->max;
275 s->gth = s->gamma * s->max;
276 s->dth = s->delta * s->max;
277
278 if (s->depth <= 8 && s->filter == WEAK) {
279 s->deblockh = deblockh8_weak;
280 s->deblockv = deblockv8_weak;
281 } else if (s->depth > 8 && s->filter == WEAK) {
282 s->deblockh = deblockh16_weak;
283 s->deblockv = deblockv16_weak;
284 }
285 if (s->depth <= 8 && s->filter == STRONG) {
286 s->deblockh = deblockh8_strong;
287 s->deblockv = deblockv8_strong;
288 } else if (s->depth > 8 && s->filter == STRONG) {
289 s->deblockh = deblockh16_strong;
290 s->deblockv = deblockv16_strong;
291 }
292
293 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
294 s->planewidth[0] = s->planewidth[3] = inlink->w;
295
296 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
297 s->planeheight[0] = s->planeheight[3] = inlink->h;
298
299 return 0;
300 }
301
filter_frame(AVFilterLink * inlink,AVFrame * in)302 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
303 {
304 AVFilterContext *ctx = inlink->dst;
305 AVFilterLink *outlink = ctx->outputs[0];
306 DeblockContext *s = ctx->priv;
307 const int block = s->block;
308 AVFrame *out;
309 int plane, x, y;
310
311 if (av_frame_is_writable(in)) {
312 out = in;
313 } else {
314 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
315 if (!out) {
316 av_frame_free(&in);
317 return AVERROR(ENOMEM);
318 }
319 av_frame_copy_props(out, in);
320 }
321
322 for (plane = 0; plane < s->nb_planes; plane++) {
323 const int width = s->planewidth[plane];
324 const int height = s->planeheight[plane];
325 const uint8_t *src = (const uint8_t *)in->data[plane];
326 uint8_t *dst = (uint8_t *)out->data[plane];
327
328 if (in != out)
329 av_image_copy_plane(dst, out->linesize[plane],
330 src, in->linesize[plane],
331 width * s->bpc, height);
332
333 if (!((1 << plane) & s->planes))
334 continue;
335
336 for (x = block; x < width; x += block)
337 s->deblockv(dst + x * s->bpc, out->linesize[plane],
338 FFMIN(block, height), s->ath, s->bth, s->gth, s->dth, s->max);
339
340 for (y = block; y < height - block; y += block) {
341 dst += out->linesize[plane] * block;
342
343 s->deblockh(dst, out->linesize[plane],
344 FFMIN(block, width),
345 s->ath, s->bth, s->gth, s->dth, s->max);
346
347 for (x = block; x < width; x += block) {
348 s->deblockh(dst + x * s->bpc, out->linesize[plane],
349 FFMIN(block, width - x),
350 s->ath, s->bth, s->gth, s->dth, s->max);
351 s->deblockv(dst + x * s->bpc, out->linesize[plane],
352 FFMIN(block, height - y),
353 s->ath, s->bth, s->gth, s->dth, s->max);
354 }
355 }
356
357 dst += out->linesize[plane] * block;
358 for (x = block; x < width; x += block)
359 s->deblockv(dst + x * s->bpc, out->linesize[plane],
360 FFMIN(block, height - y), s->ath, s->bth, s->gth, s->dth, s->max);
361
362 }
363
364 if (in != out)
365 av_frame_free(&in);
366 return ff_filter_frame(outlink, out);
367 }
368
process_command(AVFilterContext * ctx,const char * cmd,const char * args,char * res,int res_len,int flags)369 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
370 char *res, int res_len, int flags)
371 {
372 int ret;
373
374 ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
375 if (ret < 0)
376 return ret;
377
378 return config_output(ctx->outputs[0]);
379 }
380
381 #define OFFSET(x) offsetof(DeblockContext, x)
382 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
383
384 static const AVOption deblock_options[] = {
385 { "filter", "set type of filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=STRONG},0, 1, FLAGS, "filter" },
386 { "weak", 0, 0, AV_OPT_TYPE_CONST, {.i64=WEAK}, 0, 0, FLAGS, "filter" },
387 { "strong", 0, 0, AV_OPT_TYPE_CONST, {.i64=STRONG},0, 0, FLAGS, "filter" },
388 { "block", "set size of block", OFFSET(block), AV_OPT_TYPE_INT, {.i64=8}, 4, 512, FLAGS },
389 { "alpha", "set 1st detection threshold", OFFSET(alpha), AV_OPT_TYPE_FLOAT, {.dbl=.098}, 0, 1, FLAGS },
390 { "beta", "set 2nd detection threshold", OFFSET(beta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
391 { "gamma", "set 3rd detection threshold", OFFSET(gamma), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
392 { "delta", "set 4th detection threshold", OFFSET(delta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
393 { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=15}, 0, 15, FLAGS },
394 { NULL },
395 };
396
397 static const AVFilterPad inputs[] = {
398 {
399 .name = "default",
400 .type = AVMEDIA_TYPE_VIDEO,
401 .filter_frame = filter_frame,
402 },
403 };
404
405 static const AVFilterPad outputs[] = {
406 {
407 .name = "default",
408 .type = AVMEDIA_TYPE_VIDEO,
409 .config_props = config_output,
410 },
411 };
412
413 AVFILTER_DEFINE_CLASS(deblock);
414
415 const AVFilter ff_vf_deblock = {
416 .name = "deblock",
417 .description = NULL_IF_CONFIG_SMALL("Deblock video."),
418 .priv_size = sizeof(DeblockContext),
419 .priv_class = &deblock_class,
420 FILTER_INPUTS(inputs),
421 FILTER_OUTPUTS(outputs),
422 FILTER_PIXFMTS_ARRAY(pixel_fmts),
423 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
424 .process_command = process_command,
425 };
426