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FFmpeg/libavfilter/vf_smartblur.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) 2002 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2012 Jeremy Tran
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/
/**
* @file
* Apply a smartblur filter to the input video
* Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer.
*/
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libswscale/swscale.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#define RADIUS_MIN 0.1
#define RADIUS_MAX 5.0
#define STRENGTH_MIN -1.0
#define STRENGTH_MAX 1.0
#define THRESHOLD_MIN -30
#define THRESHOLD_MAX 30
typedef struct FilterParam {
float radius;
float strength;
int threshold;
float quality;
struct SwsContext *filter_context;
} FilterParam;
typedef struct SmartblurContext {
const AVClass *class;
FilterParam luma;
FilterParam chroma;
int hsub;
int vsub;
unsigned int sws_flags;
} SmartblurContext;
#define OFFSET(x) offsetof(SmartblurContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption smartblur_options[] = {
{ "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
{ "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
{ "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
{ "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
{ "luma_threshold", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS },
{ "lt", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS },
{ "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
{ "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
{ "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
{ "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
{ "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
{ "ct", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(smartblur);
static av_cold int init(AVFilterContext *ctx)
{
SmartblurContext *s = ctx->priv;
/* make chroma default to luma values, if not explicitly set */
if (s->chroma.radius < RADIUS_MIN)
s->chroma.radius = s->luma.radius;
if (s->chroma.strength < STRENGTH_MIN)
s->chroma.strength = s->luma.strength;
if (s->chroma.threshold < THRESHOLD_MIN)
s->chroma.threshold = s->luma.threshold;
s->luma.quality = s->chroma.quality = 3.0;
s->sws_flags = SWS_BICUBIC;
av_log(ctx, AV_LOG_VERBOSE,
"luma_radius:%f luma_strength:%f luma_threshold:%d "
"chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n",
s->luma.radius, s->luma.strength, s->luma.threshold,
s->chroma.radius, s->chroma.strength, s->chroma.threshold);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SmartblurContext *s = ctx->priv;
sws_freeContext(s->luma.filter_context);
sws_freeContext(s->chroma.filter_context);
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags)
{
SwsVector *vec;
SwsFilter sws_filter;
vec = sws_getGaussianVec(f->radius, f->quality);
if (!vec)
return AVERROR(EINVAL);
sws_scaleVec(vec, f->strength);
vec->coeff[vec->length / 2] += 1.0 - f->strength;
sws_filter.lumH = sws_filter.lumV = vec;
sws_filter.chrH = sws_filter.chrV = NULL;
f->filter_context = sws_getCachedContext(NULL,
width, height, AV_PIX_FMT_GRAY8,
width, height, AV_PIX_FMT_GRAY8,
flags, &sws_filter, NULL, NULL);
sws_freeVec(vec);
if (!f->filter_context)
return AVERROR(EINVAL);
return 0;
}
static int config_props(AVFilterLink *inlink)
{
SmartblurContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
s->hsub = desc->log2_chroma_w;
s->vsub = desc->log2_chroma_h;
alloc_sws_context(&s->luma, inlink->w, inlink->h, s->sws_flags);
alloc_sws_context(&s->chroma,
AV_CEIL_RSHIFT(inlink->w, s->hsub),
AV_CEIL_RSHIFT(inlink->h, s->vsub),
s->sws_flags);
return 0;
}
static void blur(uint8_t *dst, const int dst_linesize,
const uint8_t *src, const int src_linesize,
const int w, const int h, const int threshold,
struct SwsContext *filter_context)
{
int x, y;
int orig, filtered;
int diff;
/* Declare arrays of 4 to get aligned data */
const uint8_t* const src_array[4] = {src};
uint8_t *dst_array[4] = {dst};
int src_linesize_array[4] = {src_linesize};
int dst_linesize_array[4] = {dst_linesize};
sws_scale(filter_context, src_array, src_linesize_array,
0, h, dst_array, dst_linesize_array);
if (threshold > 0) {
for (y = 0; y < h; ++y) {
for (x = 0; x < w; ++x) {
orig = src[x + y * src_linesize];
filtered = dst[x + y * dst_linesize];
diff = orig - filtered;
if (diff > 0) {
if (diff > 2 * threshold)
dst[x + y * dst_linesize] = orig;
else if (diff > threshold)
/* add 'diff' and subtract 'threshold' from 'filtered' */
dst[x + y * dst_linesize] = orig - threshold;
} else {
if (-diff > 2 * threshold)
dst[x + y * dst_linesize] = orig;
else if (-diff > threshold)
/* add 'diff' and 'threshold' to 'filtered' */
dst[x + y * dst_linesize] = orig + threshold;
}
}
}
} else if (threshold < 0) {
for (y = 0; y < h; ++y) {
for (x = 0; x < w; ++x) {
orig = src[x + y * src_linesize];
filtered = dst[x + y * dst_linesize];
diff = orig - filtered;
if (diff > 0) {
if (diff <= -threshold)
dst[x + y * dst_linesize] = orig;
else if (diff <= -2 * threshold)
/* subtract 'diff' and 'threshold' from 'orig' */
dst[x + y * dst_linesize] = filtered - threshold;
} else {
if (diff >= threshold)
dst[x + y * dst_linesize] = orig;
else if (diff >= 2 * threshold)
/* add 'threshold' and subtract 'diff' from 'orig' */
dst[x + y * dst_linesize] = filtered + threshold;
}
}
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
{
SmartblurContext *s = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFrame *outpic;
int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub);
int ch = AV_CEIL_RSHIFT(inlink->h, s->vsub);
outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!outpic) {
av_frame_free(&inpic);
return AVERROR(ENOMEM);
}
av_frame_copy_props(outpic, inpic);
blur(outpic->data[0], outpic->linesize[0],
inpic->data[0], inpic->linesize[0],
inlink->w, inlink->h, s->luma.threshold,
s->luma.filter_context);
if (inpic->data[2]) {
blur(outpic->data[1], outpic->linesize[1],
inpic->data[1], inpic->linesize[1],
cw, ch, s->chroma.threshold,
s->chroma.filter_context);
blur(outpic->data[2], outpic->linesize[2],
inpic->data[2], inpic->linesize[2],
cw, ch, s->chroma.threshold,
s->chroma.filter_context);
}
av_frame_free(&inpic);
return ff_filter_frame(outlink, outpic);
}
static const AVFilterPad smartblur_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_props,
},
};
static const AVFilterPad smartblur_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_smartblur = {
.name = "smartblur",
.description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."),
.priv_size = sizeof(SmartblurContext),
.init = init,
.uninit = uninit,
FILTER_INPUTS(smartblur_inputs),
FILTER_OUTPUTS(smartblur_outputs),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &smartblur_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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