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avfilter: add temporal midway equalizer filter

Paul B Mahol committed 5 years ago

Commit 54cd0251 parent 63505fc6 files · +466 −1Browse files

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6 files
  1. Changelog +1 −0
  2. doc/filters.texi +22 −0
  3. libavfilter/Makefile +1 −0
  4. libavfilter/allfilters.c +1 −0
  5. libavfilter/version.h +1 −1
  6. libavfilter/vf_tmidequalizer.c +440 −0
Changelog+1−0
@@ -54,6 +54,7 @@ version <next>: · 53 unmodified lines
5454 - AV1 monochrome encoding support via libaom >= 2.0.1
5555 - asuperpass and asuperstop filter
5656 - shufflepixels filter
57+- tmidequalizer filter
5758
5859
5960 version 4.3:
doc/filters.texi+22−0
@@ -19323,6 +19323,28 @@ minimum values, and @code{1} maximum values. · 19322 unmodified lines
1932319323
1932419324 This filter supports all above options as @ref{commands}, excluding option @code{radius}.
1932519325
19326+@section tmidequalizer
19327+
19328+Apply Temporal Midway Video Equalization effect.
19329+
19330+Midway Video Equalization adjusts a sequence of video frames to have the same
19331+histograms, while maintaining their dynamics as much as possible. It's
19332+useful for e.g. matching exposures from a video frames sequence.
19333+
19334+This filter accepts the following option:
19335+
19336+@table @option
19337+@item radius
19338+Set filtering radius. Default is @code{5}. Allowed range is from 1 to 127.
19339+
19340+@item sigma
19341+Set filtering sigma. Default is @code{0.5}. This controls strength of filtering.
19342+Setting this option to 0 effectively does nothing.
19343+
19344+@item planes
19345+Set which planes to process. Default is @code{15}, which is all available planes.
19346+@end table
19347+
1932619348 @section tmix
1932719349
1932819350 Mix successive video frames.
libavfilter/Makefile+1−0
@@ -433,6 +433,7 @@ OBJS-$(CONFIG_TILE_FILTER) += vf_tile.o · 432 unmodified lines
433433 OBJS-$(CONFIG_TINTERLACE_FILTER) += vf_tinterlace.o
434434 OBJS-$(CONFIG_TLUT2_FILTER) += vf_lut2.o framesync.o
435435 OBJS-$(CONFIG_TMEDIAN_FILTER) += vf_xmedian.o framesync.o
436+OBJS-$(CONFIG_TMIDEQUALIZER_FILTER) += vf_tmidequalizer.o
436437 OBJS-$(CONFIG_TMIX_FILTER) += vf_mix.o framesync.o
437438 OBJS-$(CONFIG_TONEMAP_FILTER) += vf_tonemap.o colorspace.o
438439 OBJS-$(CONFIG_TONEMAP_OPENCL_FILTER) += vf_tonemap_opencl.o colorspace.o opencl.o \
libavfilter/allfilters.c+1−0
@@ -413,6 +413,7 @@ extern AVFilter ff_vf_tile; · 412 unmodified lines
413413 extern AVFilter ff_vf_tinterlace;
414414 extern AVFilter ff_vf_tlut2;
415415 extern AVFilter ff_vf_tmedian;
416+extern AVFilter ff_vf_tmidequalizer;
416417 extern AVFilter ff_vf_tmix;
417418 extern AVFilter ff_vf_tonemap;
418419 extern AVFilter ff_vf_tonemap_opencl;
libavfilter/version.h+1−1
@@ -30,7 +30,7 @@ · 29 unmodified lines
3030 #include "libavutil/version.h"
3131
3232 #define LIBAVFILTER_VERSION_MAJOR 7
33−#define LIBAVFILTER_VERSION_MINOR 94
33+#define LIBAVFILTER_VERSION_MINOR 95
3434 #define LIBAVFILTER_VERSION_MICRO 100
3535
3636
libavfilter/vf_tmidequalizer.c+440−0
@@ -0,0 +1,440 @@
1+/*
2+ * Copyright (c) 2020 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+#include "libavutil/imgutils.h"
22+#include "libavutil/pixdesc.h"
23+#include "libavutil/opt.h"
24+#include "avfilter.h"
25+#include "formats.h"
26+#include "internal.h"
27+#include "video.h"
28+
29+typedef struct TMidEqualizerContext {
30+ const AVClass *class;
31+
32+ int planes;
33+ int radius;
34+ float sigma;
35+
36+ int plane_width[4], plane_height[4];
37+ int nb_frames;
38+ int depth;
39+ int f_frames;
40+ int l_frames;
41+ int del_frame;
42+ int cur_frame;
43+ int nb_planes;
44+ int histogram_size;
45+ float kernel[127];
46+ float *histogram[4][256];
47+ float *change[4];
48+
49+ AVFrame **frames;
50+
51+ void (*compute_histogram)(const uint8_t *ssrc, ptrdiff_t linesize,
52+ int w, int h, float *histogram, size_t hsize);
53+ void (*apply_contrast_change)(const uint8_t *src, ptrdiff_t src_linesize,
54+ uint8_t *dst, ptrdiff_t dst_linesize,
55+ int w, int h, float *change, float *orig);
56+} TMidEqualizerContext;
57+
58+#define OFFSET(x) offsetof(TMidEqualizerContext, x)
59+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
60+
61+static const AVOption tmidequalizer_options[] = {
62+ { "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=5}, 1, 127, FLAGS },
63+ { "sigma", "set sigma", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS },
64+ { "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
65+ { NULL }
66+};
67+
68+AVFILTER_DEFINE_CLASS(tmidequalizer);
69+
70+static int query_formats(AVFilterContext *ctx)
71+{
72+ static const enum AVPixelFormat pix_fmts[] = {
73+ AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
74+ AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
75+ AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
76+ AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
77+ AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
78+ AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
79+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
80+ AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
81+ AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
82+ AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
83+ AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
84+ AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14,
85+ AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
86+ AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
87+ AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
88+ AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12,
89+ AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
90+ AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
91+ AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16,
92+ AV_PIX_FMT_GRAY16,
93+ AV_PIX_FMT_NONE
94+ };
95+
96+ return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
97+}
98+
99+static void compute_contrast_function(const float *const histograms[256],
100+ const float *const kernel,
101+ int nb_frames, int radius, int hsize,
102+ float *f, int idx)
103+{
104+ const float *const h1 = histograms[idx];
105+ int p2[256] = { 0 };
106+
107+ for (int p1 = 0; p1 < hsize; p1++) {
108+ float weight = 1.f;
109+ float sum = p1 * weight;
110+
111+ for (int j = 0; j < radius; j++) {
112+ const int nidx = ((idx - radius + j) % nb_frames);
113+ const float *const h2 = histograms[nidx < 0 ? nidx + nb_frames: nidx];
114+ int k = j;
115+
116+ for (; p2[k] < hsize && h2[p2[k]] < h1[p1]; p2[k]++);
117+ if (p2[k] == hsize)
118+ p2[k]--;
119+
120+ weight += kernel[j];
121+ sum += kernel[j] * p2[k];
122+ }
123+
124+ for (int j = radius + 1; j < nb_frames; j++) {
125+ const int nidx = (idx - radius + j) % nb_frames;
126+ const float *const h2 = histograms[nidx < 0 ? nidx + nb_frames: nidx];
127+ int k = j;
128+
129+ for (; p2[k] < hsize && h2[p2[k]] < h1[p1]; p2[k]++);
130+ if (p2[k] == hsize)
131+ p2[k]--;
132+
133+ weight += kernel[j - radius - 1];
134+ sum += kernel[j - radius - 1] * p2[k];
135+ }
136+
137+ f[p1] = sum / weight;
138+ }
139+}
140+
141+static void apply_contrast_change8(const uint8_t *src, ptrdiff_t src_linesize,
142+ uint8_t *dst, ptrdiff_t dst_linesize,
143+ int w, int h, float *change, float *orig)
144+{
145+ for (int y = 0; y < h; y++) {
146+ for (int x = 0; x < w; x++)
147+ dst[x] = lrintf(change[src[x]]);
148+
149+ dst += dst_linesize;
150+ src += src_linesize;
151+ }
152+}
153+
154+static void apply_contrast_change16(const uint8_t *ssrc, ptrdiff_t src_linesize,
155+ uint8_t *ddst, ptrdiff_t dst_linesize,
156+ int w, int h, float *change, float *orig)
157+{
158+ const uint16_t *src = (const uint16_t *)ssrc;
159+ uint16_t *dst = (uint16_t *)ddst;
160+
161+ for (int y = 0; y < h; y++) {
162+ for (int x = 0; x < w; x++)
163+ dst[x] = lrintf(change[src[x]]);
164+
165+ dst += dst_linesize / 2;
166+ src += src_linesize / 2;
167+ }
168+}
169+
170+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
171+{
172+ AVFilterContext *ctx = inlink->dst;
173+ TMidEqualizerContext *s = ctx->priv;
174+ AVFilterLink *outlink = ctx->outputs[0];
175+ AVFrame *out;
176+ int eof = 0;
177+
178+ if (!in) {
179+ int idx = s->f_frames < s->nb_frames ? s->radius : s->del_frame ? s->del_frame - 1 : s->nb_frames - 1;
180+
181+ if (s->f_frames < s->nb_frames) {
182+ s->l_frames = s->nb_frames - s->f_frames;
183+ } else {
184+ s->l_frames++;
185+ }
186+ in = av_frame_clone(s->frames[idx]);
187+ if (!in)
188+ return AVERROR(ENOMEM);
189+ eof = 1;
190+ }
191+
192+ if (s->f_frames < s->nb_frames) {
193+ s->frames[s->f_frames] = in;
194+
195+ for (int p = 0; p < s->nb_planes; p++) {
196+ s->compute_histogram(in->data[p], in->linesize[p],
197+ s->plane_width[p], s->plane_height[p],
198+ s->histogram[p][s->f_frames],
199+ s->histogram_size);
200+ }
201+
202+ s->f_frames++;
203+
204+ while (s->f_frames <= s->radius) {
205+ s->frames[s->f_frames] = av_frame_clone(in);
206+ if (!s->frames[s->f_frames])
207+ return AVERROR(ENOMEM);
208+ for (int p = 0; p < s->nb_planes; p++) {
209+ memcpy(s->histogram[p][s->f_frames],
210+ s->histogram[p][s->f_frames - 1],
211+ s->histogram_size * sizeof(float));
212+ }
213+ s->f_frames++;
214+ }
215+
216+ if (!eof && s->f_frames < s->nb_frames) {
217+ return 0;
218+ } else {
219+ while (s->f_frames < s->nb_frames) {
220+ s->frames[s->f_frames] = av_frame_clone(in);
221+ if (!s->frames[s->f_frames])
222+ return AVERROR(ENOMEM);
223+ for (int p = 0; p < s->nb_planes; p++) {
224+ memcpy(s->histogram[p][s->f_frames],
225+ s->histogram[p][s->f_frames - 1],
226+ s->histogram_size * sizeof(float));
227+ }
228+ s->f_frames++;
229+ }
230+ }
231+ s->cur_frame = s->radius;
232+ s->del_frame = 0;
233+ } else {
234+ av_frame_free(&s->frames[s->del_frame]);
235+ s->frames[s->del_frame] = in;
236+
237+ for (int p = 0; p < s->nb_planes; p++) {
238+ s->compute_histogram(in->data[p], in->linesize[p],
239+ s->plane_width[p], s->plane_height[p],
240+ s->histogram[p][s->del_frame],
241+ s->histogram_size);
242+ }
243+
244+ s->del_frame++;
245+ if (s->del_frame >= s->nb_frames)
246+ s->del_frame = 0;
247+ }
248+
249+ if (ctx->is_disabled) {
250+ const int idx = s->cur_frame;
251+
252+ out = av_frame_clone(s->frames[idx]);
253+ if (!out)
254+ return AVERROR(ENOMEM);
255+ } else {
256+ const int idx = s->cur_frame;
257+
258+ in = s->frames[idx];
259+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
260+ if (!out)
261+ return AVERROR(ENOMEM);
262+ av_frame_copy_props(out, in);
263+
264+ for (int p = 0; p < s->nb_planes; p++) {
265+ if (!((1 << p) & s->planes)) {
266+ av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p],
267+ s->plane_width[p] * (1 + (s->depth > 8)), s->plane_height[p]);
268+ continue;
269+ }
270+
271+ compute_contrast_function((const float *const *)s->histogram[p], s->kernel,
272+ s->nb_frames, s->radius, s->histogram_size, s->change[p], idx);
273+
274+ s->apply_contrast_change(in->data[p], in->linesize[p],
275+ out->data[p], out->linesize[p],
276+ s->plane_width[p], s->plane_height[p],
277+ s->change[p], s->histogram[p][idx]);
278+ }
279+ }
280+
281+ s->cur_frame++;
282+ if (s->cur_frame >= s->nb_frames)
283+ s->cur_frame = 0;
284+
285+ return ff_filter_frame(outlink, out);
286+}
287+
288+static void compute_histogram8(const uint8_t *src, ptrdiff_t linesize,
289+ int w, int h, float *histogram, size_t hsize)
290+{
291+ memset(histogram, 0, hsize * sizeof(*histogram));
292+
293+ for (int y = 0; y < h; y++) {
294+ for (int x = 0; x < w; x++)
295+ histogram[src[x]] += 1;
296+ src += linesize;
297+ }
298+
299+ for (int x = 0; x < hsize; x++)
300+ histogram[x] /= hsize;
301+
302+ for (int x = 1; x < hsize; x++)
303+ histogram[x] += histogram[x-1];
304+}
305+
306+static void compute_histogram16(const uint8_t *ssrc, ptrdiff_t linesize,
307+ int w, int h, float *histogram, size_t hsize)
308+{
309+ const uint16_t *src = (const uint16_t *)ssrc;
310+
311+ memset(histogram, 0, hsize * sizeof(*histogram));
312+
313+ for (int y = 0; y < h; y++) {
314+ for (int x = 0; x < w; x++)
315+ histogram[src[x]] += 1;
316+ src += linesize / 2;
317+ }
318+
319+ for (int x = 0; x < hsize; x++)
320+ histogram[x] /= hsize;
321+
322+ for (int x = 1; x < hsize; x++)
323+ histogram[x] += histogram[x-1];
324+}
325+
326+static int config_input(AVFilterLink *inlink)
327+{
328+ AVFilterContext *ctx = inlink->dst;
329+ TMidEqualizerContext *s = ctx->priv;
330+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
331+ float sigma = s->radius * s->sigma;
332+ int vsub, hsub;
333+
334+ s->depth = desc->comp[0].depth;
335+ s->nb_frames = s->radius * 2 + 1;
336+ s->nb_planes = av_pix_fmt_count_planes(inlink->format);
337+
338+ hsub = desc->log2_chroma_w;
339+ vsub = desc->log2_chroma_h;
340+
341+ s->plane_height[0] = s->plane_height[3] = inlink->h;
342+ s->plane_width[0] = s->plane_width[3] = inlink->w;
343+ s->plane_height[1] = s->plane_height[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
344+ s->plane_width[1] = s->plane_width[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
345+
346+ s->histogram_size = 1 << s->depth;
347+
348+ for (int n = 0; n < s->radius; n++)
349+ s->kernel[n] = expf(-0.5 * (n + 1) * (n + 1) / (sigma * sigma));
350+
351+ for (int p = 0; p < s->nb_planes; p++) {
352+ for (int n = 0; n < s->nb_frames; n++) {
353+ s->histogram[p][n] = av_calloc(s->histogram_size, sizeof(float));
354+ if (!s->histogram[p][n])
355+ return AVERROR(ENOMEM);
356+ }
357+
358+ s->change[p] = av_calloc(s->histogram_size, sizeof(float));
359+ if (!s->change[p])
360+ return AVERROR(ENOMEM);
361+ }
362+
363+ if (!s->frames)
364+ s->frames = av_calloc(s->nb_frames, sizeof(*s->frames));
365+ if (!s->frames)
366+ return AVERROR(ENOMEM);
367+
368+ s->compute_histogram = s->depth <= 8 ? compute_histogram8 : compute_histogram16;
369+ s->apply_contrast_change = s->depth <= 8 ? apply_contrast_change8 : apply_contrast_change16;
370+
371+ return 0;
372+}
373+
374+static int request_frame(AVFilterLink *outlink)
375+{
376+ AVFilterContext *ctx = outlink->src;
377+ TMidEqualizerContext *s = ctx->priv;
378+ int ret;
379+
380+ ret = ff_request_frame(ctx->inputs[0]);
381+ if (ret == AVERROR_EOF && s->l_frames < s->radius) {
382+ ret = filter_frame(ctx->inputs[0], NULL);
383+ }
384+
385+ return ret;
386+}
387+
388+static void free_histograms(AVFilterContext *ctx, int x, int nb_frames)
389+{
390+ TMidEqualizerContext *s = ctx->priv;
391+
392+ for (int n = 0; n < nb_frames; n++)
393+ av_freep(&s->histogram[x][n]);
394+ av_freep(&s->change[x]);
395+}
396+
397+static av_cold void uninit(AVFilterContext *ctx)
398+{
399+ TMidEqualizerContext *s = ctx->priv;
400+
401+ free_histograms(ctx, 0, s->nb_frames);
402+ free_histograms(ctx, 1, s->nb_frames);
403+ free_histograms(ctx, 2, s->nb_frames);
404+ free_histograms(ctx, 3, s->nb_frames);
405+
406+ for (int i = 0; i < s->nb_frames && s->frames; i++)
407+ av_frame_free(&s->frames[i]);
408+ av_freep(&s->frames);
409+}
410+
411+static const AVFilterPad tmidequalizer_inputs[] = {
412+ {
413+ .name = "default",
414+ .type = AVMEDIA_TYPE_VIDEO,
415+ .config_props = config_input,
416+ .filter_frame = filter_frame,
417+ },
418+ { NULL }
419+};
420+
421+static const AVFilterPad tmidequalizer_outputs[] = {
422+ {
423+ .name = "default",
424+ .type = AVMEDIA_TYPE_VIDEO,
425+ .request_frame = request_frame,
426+ },
427+ { NULL }
428+};
429+
430+AVFilter ff_vf_tmidequalizer = {
431+ .name = "tmidequalizer",
432+ .description = NULL_IF_CONFIG_SMALL("Apply Temporal Midway Equalization."),
433+ .priv_size = sizeof(TMidEqualizerContext),
434+ .uninit = uninit,
435+ .query_formats = query_formats,
436+ .inputs = tmidequalizer_inputs,
437+ .outputs = tmidequalizer_outputs,
438+ .priv_class = &tmidequalizer_class,
439+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
440+};

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