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
query_formats(AVFilterContext * ctx)64 static int query_formats(AVFilterContext *ctx)
65 {
66 static const enum AVPixelFormat pixel_fmts[] = {
67 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
68 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
69 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
70 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
71 AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
72 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
73 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
74 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
75 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
76 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
77 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
78 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
79 AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
80 AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
81 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
82 AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
83 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
84 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
85 AV_PIX_FMT_NONE
86 };
87 AVFilterFormats *formats = ff_make_format_list(pixel_fmts);
88 if (!formats)
89 return AVERROR(ENOMEM);
90 return ff_set_common_formats(ctx, formats);
91 }
92
93 #define WEAK_HFILTER(name, type, ldiv) \
94 static void deblockh##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
95 int ath, int bth, int gth, int dth, int max) \
96 { \
97 type *dst; \
98 int x; \
99 \
100 dst = (type *)dstp; \
101 dst_linesize /= ldiv; \
102 \
103 for (x = 0; x < block; x++) { \
104 int delta = dst[x] - dst[x - dst_linesize]; \
105 int A, B, C, D, a, b, c, d; \
106 \
107 if (FFABS(delta) >= ath || \
108 FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
109 FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= gth) \
110 continue; \
111 \
112 A = dst[x - 2 * dst_linesize]; \
113 B = dst[x - 1 * dst_linesize]; \
114 C = dst[x + 0 * dst_linesize]; \
115 D = dst[x + 1 * dst_linesize]; \
116 \
117 a = A + delta / 8; \
118 b = B + delta / 2; \
119 c = C - delta / 2; \
120 d = D - delta / 8; \
121 \
122 dst[x - 2 * dst_linesize] = av_clip(a, 0, max); \
123 dst[x - 1 * dst_linesize] = av_clip(b, 0, max); \
124 dst[x + 0 * dst_linesize] = av_clip(c, 0, max); \
125 dst[x + 1 * dst_linesize] = av_clip(d, 0, max); \
126 } \
127 }
128
129 WEAK_HFILTER(8, uint8_t, 1)
130 WEAK_HFILTER(16, uint16_t, 2)
131
132 #define WEAK_VFILTER(name, type, ldiv) \
133 static void deblockv##name##_weak(uint8_t *dstp, ptrdiff_t dst_linesize, int block, \
134 int ath, int bth, int gth, int dth, int max) \
135 { \
136 type *dst; \
137 int y; \
138 \
139 dst = (type *)dstp; \
140 dst_linesize /= ldiv; \
141 \
142 for (y = 0; y < block; y++) { \
143 int delta = dst[0] - dst[-1]; \
144 int A, B, C, D, a, b, c, d; \
145 \
146 if (FFABS(delta) >= ath || \
147 FFABS(dst[-1] - dst[-2]) >= bth || \
148 FFABS(dst[0] - dst[1]) >= gth) \
149 continue; \
150 \
151 A = dst[-2]; \
152 B = dst[-1]; \
153 C = dst[+0]; \
154 D = dst[+1]; \
155 \
156 a = A + delta / 8; \
157 b = B + delta / 2; \
158 c = C - delta / 2; \
159 d = D - delta / 8; \
160 \
161 dst[-2] = av_clip(a, 0, max); \
162 dst[-1] = av_clip(b, 0, max); \
163 dst[+0] = av_clip(c, 0, max); \
164 dst[+1] = av_clip(d, 0, max); \
165 \
166 dst += dst_linesize; \
167 } \
168 }
169
170 WEAK_VFILTER(8, uint8_t, 1)
171 WEAK_VFILTER(16, uint16_t, 2)
172
173 #define STRONG_HFILTER(name, type, ldiv) \
174 static void deblockh##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
175 int ath, int bth, int gth, int dth, int max) \
176 { \
177 type *dst; \
178 int x; \
179 \
180 dst = (type *)dstp; \
181 dst_linesize /= ldiv; \
182 \
183 for (x = 0; x < block; x++) { \
184 int A, B, C, D, E, F, a, b, c, d, e, f; \
185 int delta = dst[x] - dst[x - dst_linesize]; \
186 \
187 if (FFABS(delta) >= ath || \
188 FFABS(dst[x - 1 * dst_linesize] - dst[x - 2 * dst_linesize]) >= bth || \
189 FFABS(dst[x + 1 * dst_linesize] - dst[x + 2 * dst_linesize]) >= gth || \
190 FFABS(dst[x + 0 * dst_linesize] - dst[x + 1 * dst_linesize]) >= dth) \
191 continue; \
192 \
193 A = dst[x - 3 * dst_linesize]; \
194 B = dst[x - 2 * dst_linesize]; \
195 C = dst[x - 1 * dst_linesize]; \
196 D = dst[x + 0 * dst_linesize]; \
197 E = dst[x + 1 * dst_linesize]; \
198 F = dst[x + 2 * dst_linesize]; \
199 \
200 a = A + delta / 8; \
201 b = B + delta / 4; \
202 c = C + delta / 2; \
203 d = D - delta / 2; \
204 e = E - delta / 4; \
205 f = F - delta / 8; \
206 \
207 dst[x - 3 * dst_linesize] = av_clip(a, 0, max); \
208 dst[x - 2 * dst_linesize] = av_clip(b, 0, max); \
209 dst[x - 1 * dst_linesize] = av_clip(c, 0, max); \
210 dst[x + 0 * dst_linesize] = av_clip(d, 0, max); \
211 dst[x + 1 * dst_linesize] = av_clip(e, 0, max); \
212 dst[x + 2 * dst_linesize] = av_clip(f, 0, max); \
213 } \
214 }
215
216 STRONG_HFILTER(8, uint8_t, 1)
217 STRONG_HFILTER(16, uint16_t, 2)
218
219 #define STRONG_VFILTER(name, type, ldiv) \
220 static void deblockv##name##_strong(uint8_t *dstp, ptrdiff_t dst_linesize, int block,\
221 int ath, int bth, int gth, int dth, int max) \
222 { \
223 type *dst; \
224 int y; \
225 \
226 dst = (type *)dstp; \
227 dst_linesize /= ldiv; \
228 \
229 for (y = 0; y < block; y++) { \
230 int A, B, C, D, E, F, a, b, c, d, e, f; \
231 int delta = dst[0] - dst[-1]; \
232 \
233 if (FFABS(delta) >= ath || \
234 FFABS(dst[-1] - dst[-2]) >= bth || \
235 FFABS(dst[+1] - dst[+2]) >= gth || \
236 FFABS(dst[+0] - dst[+1]) >= dth) \
237 continue; \
238 \
239 A = dst[-3]; \
240 B = dst[-2]; \
241 C = dst[-1]; \
242 D = dst[+0]; \
243 E = dst[+1]; \
244 F = dst[+2]; \
245 \
246 a = A + delta / 8; \
247 b = B + delta / 4; \
248 c = C + delta / 2; \
249 d = D - delta / 2; \
250 e = E - delta / 4; \
251 f = F - delta / 8; \
252 \
253 dst[-3] = av_clip(a, 0, max); \
254 dst[-2] = av_clip(b, 0, max); \
255 dst[-1] = av_clip(c, 0, max); \
256 dst[+0] = av_clip(d, 0, max); \
257 dst[+1] = av_clip(e, 0, max); \
258 dst[+2] = av_clip(f, 0, max); \
259 \
260 dst += dst_linesize; \
261 } \
262 }
263
264 STRONG_VFILTER(8, uint8_t, 1)
265 STRONG_VFILTER(16, uint16_t, 2)
266
config_output(AVFilterLink * outlink)267 static int config_output(AVFilterLink *outlink)
268 {
269 AVFilterContext *ctx = outlink->src;
270 DeblockContext *s = ctx->priv;
271 AVFilterLink *inlink = ctx->inputs[0];
272
273 s->desc = av_pix_fmt_desc_get(outlink->format);
274 if (!s->desc)
275 return AVERROR_BUG;
276 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
277 s->depth = s->desc->comp[0].depth;
278 s->bpc = (s->depth + 7) / 8;
279 s->max = (1 << s->depth) - 1;
280 s->ath = s->alpha * s->max;
281 s->bth = s->beta * s->max;
282 s->gth = s->gamma * s->max;
283 s->dth = s->delta * s->max;
284
285 if (s->depth <= 8 && s->filter == WEAK) {
286 s->deblockh = deblockh8_weak;
287 s->deblockv = deblockv8_weak;
288 } else if (s->depth > 8 && s->filter == WEAK) {
289 s->deblockh = deblockh16_weak;
290 s->deblockv = deblockv16_weak;
291 }
292 if (s->depth <= 8 && s->filter == STRONG) {
293 s->deblockh = deblockh8_strong;
294 s->deblockv = deblockv8_strong;
295 } else if (s->depth > 8 && s->filter == STRONG) {
296 s->deblockh = deblockh16_strong;
297 s->deblockv = deblockv16_strong;
298 }
299
300 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
301 s->planewidth[0] = s->planewidth[3] = inlink->w;
302
303 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
304 s->planeheight[0] = s->planeheight[3] = inlink->h;
305
306 return 0;
307 }
308
filter_frame(AVFilterLink * inlink,AVFrame * in)309 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
310 {
311 AVFilterContext *ctx = inlink->dst;
312 AVFilterLink *outlink = ctx->outputs[0];
313 DeblockContext *s = ctx->priv;
314 const int block = s->block;
315 AVFrame *out;
316 int plane, x, y;
317
318 if (av_frame_is_writable(in)) {
319 out = in;
320 } else {
321 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
322 if (!out) {
323 av_frame_free(&in);
324 return AVERROR(ENOMEM);
325 }
326 av_frame_copy_props(out, in);
327 }
328
329 for (plane = 0; plane < s->nb_planes; plane++) {
330 const int width = s->planewidth[plane];
331 const int height = s->planeheight[plane];
332 const uint8_t *src = (const uint8_t *)in->data[plane];
333 uint8_t *dst = (uint8_t *)out->data[plane];
334
335 if (in != out)
336 av_image_copy_plane(dst, out->linesize[plane],
337 src, in->linesize[plane],
338 width * s->bpc, height);
339
340 if (!((1 << plane) & s->planes))
341 continue;
342
343 for (x = block; x < width; x += block)
344 s->deblockv(dst + x * s->bpc, out->linesize[plane],
345 FFMIN(block, height), s->ath, s->bth, s->gth, s->dth, s->max);
346
347 for (y = block; y < height; y += block) {
348 dst += out->linesize[plane] * block;
349
350 s->deblockh(dst, out->linesize[plane],
351 FFMIN(block, width),
352 s->ath, s->bth, s->gth, s->dth, s->max);
353
354 for (x = block; x < width; x += block) {
355 s->deblockh(dst + x * s->bpc, out->linesize[plane],
356 FFMIN(block, width - x),
357 s->ath, s->bth, s->gth, s->dth, s->max);
358 s->deblockv(dst + x * s->bpc, out->linesize[plane],
359 FFMIN(block, height - y),
360 s->ath, s->bth, s->gth, s->dth, s->max);
361 }
362 }
363 }
364
365 if (in != out)
366 av_frame_free(&in);
367 return ff_filter_frame(outlink, out);
368 }
369
process_command(AVFilterContext * ctx,const char * cmd,const char * args,char * res,int res_len,int flags)370 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
371 char *res, int res_len, int flags)
372 {
373 int ret;
374
375 ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
376 if (ret < 0)
377 return ret;
378
379 return config_output(ctx->outputs[0]);
380 }
381
382 #define OFFSET(x) offsetof(DeblockContext, x)
383 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
384
385 static const AVOption deblock_options[] = {
386 { "filter", "set type of filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=STRONG},0, 1, FLAGS, "filter" },
387 { "weak", 0, 0, AV_OPT_TYPE_CONST, {.i64=WEAK}, 0, 0, FLAGS, "filter" },
388 { "strong", 0, 0, AV_OPT_TYPE_CONST, {.i64=STRONG},0, 0, FLAGS, "filter" },
389 { "block", "set size of block", OFFSET(block), AV_OPT_TYPE_INT, {.i64=8}, 4, 512, FLAGS },
390 { "alpha", "set 1st detection threshold", OFFSET(alpha), AV_OPT_TYPE_FLOAT, {.dbl=.098}, 0, 1, FLAGS },
391 { "beta", "set 2nd detection threshold", OFFSET(beta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
392 { "gamma", "set 3rd detection threshold", OFFSET(gamma), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
393 { "delta", "set 4th detection threshold", OFFSET(delta), AV_OPT_TYPE_FLOAT, {.dbl=.05}, 0, 1, FLAGS },
394 { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=15}, 0, 15, FLAGS },
395 { NULL },
396 };
397
398 static const AVFilterPad inputs[] = {
399 {
400 .name = "default",
401 .type = AVMEDIA_TYPE_VIDEO,
402 .filter_frame = filter_frame,
403 },
404 { NULL }
405 };
406
407 static const AVFilterPad outputs[] = {
408 {
409 .name = "default",
410 .type = AVMEDIA_TYPE_VIDEO,
411 .config_props = config_output,
412 },
413 { NULL }
414 };
415
416 AVFILTER_DEFINE_CLASS(deblock);
417
418 AVFilter ff_vf_deblock = {
419 .name = "deblock",
420 .description = NULL_IF_CONFIG_SMALL("Deblock video."),
421 .priv_size = sizeof(DeblockContext),
422 .priv_class = &deblock_class,
423 .query_formats = query_formats,
424 .inputs = inputs,
425 .outputs = outputs,
426 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
427 .process_command = process_command,
428 };
429