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avfilter: add temporal midway equalizer filter

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This commit is contained in:
Paul B Mahol 2020-12-26 13:52:24 +01:00
parent 63505fc60a
commit 54cd025a82
6 changed files with 466 additions and 1 deletions
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1
Changelog
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@ -54,6 +54,7 @@ version <next>:
- AV1 monochrome encoding support via libaom >= 2.0.1
- asuperpass and asuperstop filter
- shufflepixels filter
- tmidequalizer filter
version 4.3:

22
doc/filters.texi
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@ -19323,6 +19323,28 @@ minimum values, and @code{1} maximum values.
This filter supports all above options as @ref{commands}, excluding option @code{radius}.
@section tmidequalizer
Apply Temporal Midway Video Equalization effect.
Midway Video Equalization adjusts a sequence of video frames to have the same
histograms, while maintaining their dynamics as much as possible. It's
useful for e.g. matching exposures from a video frames sequence.
This filter accepts the following option:
@table @option
@item radius
Set filtering radius. Default is @code{5}. Allowed range is from 1 to 127.
@item sigma
Set filtering sigma. Default is @code{0.5}. This controls strength of filtering.
Setting this option to 0 effectively does nothing.
@item planes
Set which planes to process. Default is @code{15}, which is all available planes.
@end table
@section tmix
Mix successive video frames.

1
libavfilter/Makefile
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@ -433,6 +433,7 @@ OBJS-$(CONFIG_TILE_FILTER) += vf_tile.o
OBJS-$(CONFIG_TINTERLACE_FILTER) += vf_tinterlace.o
OBJS-$(CONFIG_TLUT2_FILTER) += vf_lut2.o framesync.o
OBJS-$(CONFIG_TMEDIAN_FILTER) += vf_xmedian.o framesync.o
OBJS-$(CONFIG_TMIDEQUALIZER_FILTER) += vf_tmidequalizer.o
OBJS-$(CONFIG_TMIX_FILTER) += vf_mix.o framesync.o
OBJS-$(CONFIG_TONEMAP_FILTER) += vf_tonemap.o colorspace.o
OBJS-$(CONFIG_TONEMAP_OPENCL_FILTER) += vf_tonemap_opencl.o colorspace.o opencl.o \

1
libavfilter/allfilters.c
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@ -413,6 +413,7 @@ extern AVFilter ff_vf_tile;
extern AVFilter ff_vf_tinterlace;
extern AVFilter ff_vf_tlut2;
extern AVFilter ff_vf_tmedian;
extern AVFilter ff_vf_tmidequalizer;
extern AVFilter ff_vf_tmix;
extern AVFilter ff_vf_tonemap;
extern AVFilter ff_vf_tonemap_opencl;

2
libavfilter/version.h
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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
#define LIBAVFILTER_VERSION_MINOR 94
#define LIBAVFILTER_VERSION_MINOR 95
#define LIBAVFILTER_VERSION_MICRO 100

440
libavfilter/vf_tmidequalizer.c Normal file
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@ -0,0 +1,440 @@
/*
* Copyright (c) 2020 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct TMidEqualizerContext {
const AVClass *class;
int planes;
int radius;
float sigma;
int plane_width[4], plane_height[4];
int nb_frames;
int depth;
int f_frames;
int l_frames;
int del_frame;
int cur_frame;
int nb_planes;
int histogram_size;
float kernel[127];
float *histogram[4][256];
float *change[4];
AVFrame **frames;
void (*compute_histogram)(const uint8_t *ssrc, ptrdiff_t linesize,
int w, int h, float *histogram, size_t hsize);
void (*apply_contrast_change)(const uint8_t *src, ptrdiff_t src_linesize,
uint8_t *dst, ptrdiff_t dst_linesize,
int w, int h, float *change, float *orig);
} TMidEqualizerContext;
#define OFFSET(x) offsetof(TMidEqualizerContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption tmidequalizer_options[] = {
{ "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=5}, 1, 127, FLAGS },
{ "sigma", "set sigma", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS },
{ "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(tmidequalizer);
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
}
static void compute_contrast_function(const float *const histograms[256],
const float *const kernel,
int nb_frames, int radius, int hsize,
float *f, int idx)
{
const float *const h1 = histograms[idx];
int p2[256] = { 0 };
for (int p1 = 0; p1 < hsize; p1++) {
float weight = 1.f;
float sum = p1 * weight;
for (int j = 0; j < radius; j++) {
const int nidx = ((idx - radius + j) % nb_frames);
const float *const h2 = histograms[nidx < 0 ? nidx + nb_frames: nidx];
int k = j;
for (; p2[k] < hsize && h2[p2[k]] < h1[p1]; p2[k]++);
if (p2[k] == hsize)
p2[k]--;
weight += kernel[j];
sum += kernel[j] * p2[k];
}
for (int j = radius + 1; j < nb_frames; j++) {
const int nidx = (idx - radius + j) % nb_frames;
const float *const h2 = histograms[nidx < 0 ? nidx + nb_frames: nidx];
int k = j;
for (; p2[k] < hsize && h2[p2[k]] < h1[p1]; p2[k]++);
if (p2[k] == hsize)
p2[k]--;
weight += kernel[j - radius - 1];
sum += kernel[j - radius - 1] * p2[k];
}
f[p1] = sum / weight;
}
}
static void apply_contrast_change8(const uint8_t *src, ptrdiff_t src_linesize,
uint8_t *dst, ptrdiff_t dst_linesize,
int w, int h, float *change, float *orig)
{
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++)
dst[x] = lrintf(change[src[x]]);
dst += dst_linesize;
src += src_linesize;
}
}
static void apply_contrast_change16(const uint8_t *ssrc, ptrdiff_t src_linesize,
uint8_t *ddst, ptrdiff_t dst_linesize,
int w, int h, float *change, float *orig)
{
const uint16_t *src = (const uint16_t *)ssrc;
uint16_t *dst = (uint16_t *)ddst;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++)
dst[x] = lrintf(change[src[x]]);
dst += dst_linesize / 2;
src += src_linesize / 2;
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
TMidEqualizerContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
int eof = 0;
if (!in) {
int idx = s->f_frames < s->nb_frames ? s->radius : s->del_frame ? s->del_frame - 1 : s->nb_frames - 1;
if (s->f_frames < s->nb_frames) {
s->l_frames = s->nb_frames - s->f_frames;
} else {
s->l_frames++;
}
in = av_frame_clone(s->frames[idx]);
if (!in)
return AVERROR(ENOMEM);
eof = 1;
}
if (s->f_frames < s->nb_frames) {
s->frames[s->f_frames] = in;
for (int p = 0; p < s->nb_planes; p++) {
s->compute_histogram(in->data[p], in->linesize[p],
s->plane_width[p], s->plane_height[p],
s->histogram[p][s->f_frames],
s->histogram_size);
}
s->f_frames++;
while (s->f_frames <= s->radius) {
s->frames[s->f_frames] = av_frame_clone(in);
if (!s->frames[s->f_frames])
return AVERROR(ENOMEM);
for (int p = 0; p < s->nb_planes; p++) {
memcpy(s->histogram[p][s->f_frames],
s->histogram[p][s->f_frames - 1],
s->histogram_size * sizeof(float));
}
s->f_frames++;
}
if (!eof && s->f_frames < s->nb_frames) {
return 0;
} else {
while (s->f_frames < s->nb_frames) {
s->frames[s->f_frames] = av_frame_clone(in);
if (!s->frames[s->f_frames])
return AVERROR(ENOMEM);
for (int p = 0; p < s->nb_planes; p++) {
memcpy(s->histogram[p][s->f_frames],
s->histogram[p][s->f_frames - 1],
s->histogram_size * sizeof(float));
}
s->f_frames++;
}
}
s->cur_frame = s->radius;
s->del_frame = 0;
} else {
av_frame_free(&s->frames[s->del_frame]);
s->frames[s->del_frame] = in;
for (int p = 0; p < s->nb_planes; p++) {
s->compute_histogram(in->data[p], in->linesize[p],
s->plane_width[p], s->plane_height[p],
s->histogram[p][s->del_frame],
s->histogram_size);
}
s->del_frame++;
if (s->del_frame >= s->nb_frames)
s->del_frame = 0;
}
if (ctx->is_disabled) {
const int idx = s->cur_frame;
out = av_frame_clone(s->frames[idx]);
if (!out)
return AVERROR(ENOMEM);
} else {
const int idx = s->cur_frame;
in = s->frames[idx];
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, in);
for (int p = 0; p < s->nb_planes; p++) {
if (!((1 << p) & s->planes)) {
av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p],
s->plane_width[p] * (1 + (s->depth > 8)), s->plane_height[p]);
continue;
}
compute_contrast_function((const float *const *)s->histogram[p], s->kernel,
s->nb_frames, s->radius, s->histogram_size, s->change[p], idx);
s->apply_contrast_change(in->data[p], in->linesize[p],
out->data[p], out->linesize[p],
s->plane_width[p], s->plane_height[p],
s->change[p], s->histogram[p][idx]);
}
}
s->cur_frame++;
if (s->cur_frame >= s->nb_frames)
s->cur_frame = 0;
return ff_filter_frame(outlink, out);
}
static void compute_histogram8(const uint8_t *src, ptrdiff_t linesize,
int w, int h, float *histogram, size_t hsize)
{
memset(histogram, 0, hsize * sizeof(*histogram));
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++)
histogram[src[x]] += 1;
src += linesize;
}
for (int x = 0; x < hsize; x++)
histogram[x] /= hsize;
for (int x = 1; x < hsize; x++)
histogram[x] += histogram[x-1];
}
static void compute_histogram16(const uint8_t *ssrc, ptrdiff_t linesize,
int w, int h, float *histogram, size_t hsize)
{
const uint16_t *src = (const uint16_t *)ssrc;
memset(histogram, 0, hsize * sizeof(*histogram));
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++)
histogram[src[x]] += 1;
src += linesize / 2;
}
for (int x = 0; x < hsize; x++)
histogram[x] /= hsize;
for (int x = 1; x < hsize; x++)
histogram[x] += histogram[x-1];
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
TMidEqualizerContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
float sigma = s->radius * s->sigma;
int vsub, hsub;
s->depth = desc->comp[0].depth;
s->nb_frames = s->radius * 2 + 1;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
hsub = desc->log2_chroma_w;
vsub = desc->log2_chroma_h;
s->plane_height[0] = s->plane_height[3] = inlink->h;
s->plane_width[0] = s->plane_width[3] = inlink->w;
s->plane_height[1] = s->plane_height[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
s->plane_width[1] = s->plane_width[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
s->histogram_size = 1 << s->depth;
for (int n = 0; n < s->radius; n++)
s->kernel[n] = expf(-0.5 * (n + 1) * (n + 1) / (sigma * sigma));
for (int p = 0; p < s->nb_planes; p++) {
for (int n = 0; n < s->nb_frames; n++) {
s->histogram[p][n] = av_calloc(s->histogram_size, sizeof(float));
if (!s->histogram[p][n])
return AVERROR(ENOMEM);
}
s->change[p] = av_calloc(s->histogram_size, sizeof(float));
if (!s->change[p])
return AVERROR(ENOMEM);
}
if (!s->frames)
s->frames = av_calloc(s->nb_frames, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
s->compute_histogram = s->depth <= 8 ? compute_histogram8 : compute_histogram16;
s->apply_contrast_change = s->depth <= 8 ? apply_contrast_change8 : apply_contrast_change16;
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
TMidEqualizerContext *s = ctx->priv;
int ret;
ret = ff_request_frame(ctx->inputs[0]);
if (ret == AVERROR_EOF && s->l_frames < s->radius) {
ret = filter_frame(ctx->inputs[0], NULL);
}
return ret;
}
static void free_histograms(AVFilterContext *ctx, int x, int nb_frames)
{
TMidEqualizerContext *s = ctx->priv;
for (int n = 0; n < nb_frames; n++)
av_freep(&s->histogram[x][n]);
av_freep(&s->change[x]);
}
static av_cold void uninit(AVFilterContext *ctx)
{
TMidEqualizerContext *s = ctx->priv;
free_histograms(ctx, 0, s->nb_frames);
free_histograms(ctx, 1, s->nb_frames);
free_histograms(ctx, 2, s->nb_frames);
free_histograms(ctx, 3, s->nb_frames);
for (int i = 0; i < s->nb_frames && s->frames; i++)
av_frame_free(&s->frames[i]);
av_freep(&s->frames);
}
static const AVFilterPad tmidequalizer_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad tmidequalizer_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter ff_vf_tmidequalizer = {
.name = "tmidequalizer",
.description = NULL_IF_CONFIG_SMALL("Apply Temporal Midway Equalization."),
.priv_size = sizeof(TMidEqualizerContext),
.uninit = uninit,
.query_formats = query_formats,
.inputs = tmidequalizer_inputs,
.outputs = tmidequalizer_outputs,
.priv_class = &tmidequalizer_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};