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FFmpeg/libavfilter/vf_smartblur.c
Zhao Zhili 3951c1899e avfilter/vf_smartblur: pass old context to sws_getCachedContext 
Otherwise it make no sense to use sws_getCachedContext.

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
2023-09-20 23:24:55 +08:00

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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 "internal.h"
#include "video.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 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
};
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(f->filter_context,
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,
},
};
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(ff_video_default_filterpad),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.priv_class = &smartblur_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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