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FFmpeg/libavfilter/vf_median.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback 
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

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/*
* Copyright (c) 2019 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
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*/
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "median.h"
#include "video.h"
#define DEPTH 8
#include "median_template.c"
#undef DEPTH
#define DEPTH 9
#include "median_template.c"
#undef DEPTH
#define DEPTH 10
#include "median_template.c"
#undef DEPTH
#define DEPTH 12
#include "median_template.c"
#undef DEPTH
#define DEPTH 14
#include "median_template.c"
#undef DEPTH
#define DEPTH 16
#include "median_template.c"
#define OFFSET(x) offsetof(MedianContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption median_options[] = {
{ "radius", "set median radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=1}, 1, 127, FLAGS },
{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
{ "radiusV", "set median vertical radius", OFFSET(radiusV), AV_OPT_TYPE_INT, {.i64=0},0, 127, FLAGS },
{ "percentile", "set median percentile", OFFSET(percentile), AV_OPT_TYPE_FLOAT, {.dbl=.5}, 0., 1., FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(median);
static void hadd(htype *dst, const htype *src, int bins)
{
for (int i = 0; i < bins; i++)
dst[i] += src[i];
}
static void hsub(htype *dst, const htype *src, int bins)
{
for (int i = 0; i < bins; i++)
dst[i] -= src[i];
}
static void hmuladd(htype *dst, const htype *src, int f, int bins)
{
for (int i = 0; i < bins; i++)
dst[i] += f * src[i];
}
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_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9, AV_PIX_FMT_GBRP9,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
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_YUV440P12,
AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static void check_params(MedianContext *s, AVFilterLink *inlink)
{
for (int i = 0; i < s->nb_planes; i++) {
if (!(s->planes & (1 << i)))
continue;
if (s->planewidth[i] < s->radius * 2 + 1) {
av_log(inlink->dst, AV_LOG_WARNING, "The %d plane width %d must be not less than %d, clipping radius.\n", i, s->planewidth[i], s->radius * 2 + 1);
s->radius = (s->planewidth[i] - 1) / 2;
}
if (s->planeheight[i] < s->radiusV * 2 + 1) {
av_log(inlink->dst, AV_LOG_WARNING, "The %d plane height %d must be not less than %d, clipping radiusV.\n", i, s->planeheight[i], s->radiusV * 2 + 1);
s->radiusV = (s->planeheight[i] - 1) / 2;
}
}
s->t = (2 * s->radius * s->radiusV + s->radiusV + s->radius) * 2.f * s->percentile;
}
static int config_input(AVFilterLink *inlink)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
MedianContext *s = inlink->dst->priv;
s->depth = desc->comp[0].depth;
s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
s->planewidth[0] = s->planewidth[3] = inlink->w;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->radiusV = !s->radiusV ? s->radius : s->radiusV;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
check_params(s, inlink);
s->nb_threads = FFMAX(1, FFMIN(s->planeheight[1] / (s->radiusV + 1), ff_filter_get_nb_threads(inlink->dst)));
s->bins = 1 << ((s->depth + 1) / 2);
s->fine_size = s->bins * s->bins * inlink->w;
s->coarse_size = s->bins * inlink->w;
s->coarse = av_calloc(s->nb_threads, sizeof(*s->coarse));
s->fine = av_calloc(s->nb_threads, sizeof(*s->fine));
if (!s->coarse || !s->fine)
return AVERROR(ENOMEM);
for (int i = 0; i < s->nb_threads; i++) {
s->coarse[i] = av_malloc_array(s->coarse_size, sizeof(**s->coarse));
s->fine[i] = av_malloc_array(s->fine_size, sizeof(**s->fine));
if (!s->coarse[i] || !s->fine[i])
return AVERROR(ENOMEM);
}
s->hadd = hadd;
s->hsub = hsub;
s->hmuladd = hmuladd;
switch (s->depth) {
case 8: s->filter_plane = filter_plane_8; break;
case 9: s->filter_plane = filter_plane_9; break;
case 10: s->filter_plane = filter_plane_10; break;
case 12: s->filter_plane = filter_plane_12; break;
case 14: s->filter_plane = filter_plane_14; break;
case 16: s->filter_plane = filter_plane_16; break;
}
return 0;
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
MedianContext *s = ctx->priv;
ThreadData *td = arg;
AVFrame *in = td->in;
AVFrame *out = td->out;
for (int plane = 0; plane < s->nb_planes; plane++) {
const int h = s->planeheight[plane];
const int w = s->planewidth[plane];
const int slice_h_start = (h * jobnr) / nb_jobs;
const int slice_h_end = (h * (jobnr+1)) / nb_jobs;
if (!(s->planes & (1 << plane))) {
av_image_copy_plane(out->data[plane] + slice_h_start * out->linesize[plane],
out->linesize[plane],
in->data[plane] + slice_h_start * in->linesize[plane],
in->linesize[plane],
w * ((s->depth + 7) / 8),
slice_h_end - slice_h_start);
continue;
}
s->filter_plane(ctx, in->data[plane],
in->linesize[plane],
out->data[plane] + slice_h_start * out->linesize[plane],
out->linesize[plane], w, h,
slice_h_start, slice_h_end, jobnr);
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
MedianContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
AVFrame *out;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
td.in = in; td.out = out;
ff_filter_execute(ctx, filter_slice, &td, NULL, s->nb_threads);
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
MedianContext *s = ctx->priv;
for (int i = 0; i < s->nb_threads && s->coarse && s->fine; i++) {
av_freep(&s->coarse[i]);
av_freep(&s->fine[i]);
}
av_freep(&s->coarse);
av_freep(&s->fine);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
MedianContext *s = ctx->priv;
int ret;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
if (!s->radiusV)
s->radiusV = s->radius;
check_params(s, ctx->inputs[0]);
return 0;
}
static const AVFilterPad median_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
static const AVFilterPad median_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_median = {
.name = "median",
.description = NULL_IF_CONFIG_SMALL("Apply Median filter."),
.priv_size = sizeof(MedianContext),
.priv_class = &median_class,
.uninit = uninit,
FILTER_INPUTS(median_inputs),
FILTER_OUTPUTS(median_outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = process_command,
};
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