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vf_sab.c
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/*
* Copyright (c) 2002 Michael Niedermayer <[email protected]>
*
* 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
* Shape Adaptive Blur filter, ported from MPlayer libmpcodecs/vf_sab.c
*/
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libswscale/swscale.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
typedef struct {
float radius;
float pre_filter_radius;
float strength;
float quality;
struct SwsContext *pre_filter_context;
uint8_t *pre_filter_buf;
int pre_filter_linesize;
int dist_width;
int dist_linesize;
int *dist_coeff;
#define COLOR_DIFF_COEFF_SIZE 512
int color_diff_coeff[COLOR_DIFF_COEFF_SIZE];
} FilterParam;
typedef struct {
const AVClass *class;
FilterParam luma;
FilterParam chroma;
int hsub;
int vsub;
unsigned int sws_flags;
} SabContext;
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV411P,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
#define RADIUS_MIN 0.1
#define RADIUS_MAX 4.0
#define PRE_FILTER_RADIUS_MIN 0.1
#define PRE_FILTER_RADIUS_MAX 2.0
#define STRENGTH_MIN 0.1
#define STRENGTH_MAX 100.0
#define OFFSET(x) offsetof(SabContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption sab_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_pre_filter_radius", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
{ "lpfr", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_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 },
{ "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_pre_filter_radius", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1},
PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
{ "cpfr", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1},
PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_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 },
{ NULL }
};
AVFILTER_DEFINE_CLASS(sab);
static av_cold int init(AVFilterContext *ctx)
{
SabContext *sab = ctx->priv;
/* make chroma default to luma values, if not explicitly set */
if (sab->chroma.radius < RADIUS_MIN)
sab->chroma.radius = sab->luma.radius;
if (sab->chroma.pre_filter_radius < PRE_FILTER_RADIUS_MIN)
sab->chroma.pre_filter_radius = sab->luma.pre_filter_radius;
if (sab->chroma.strength < STRENGTH_MIN)
sab->chroma.strength = sab->luma.strength;
sab->luma.quality = sab->chroma.quality = 3.0;
sab->sws_flags = SWS_POINT;
av_log(ctx, AV_LOG_VERBOSE,
"luma_radius:%f luma_pre_filter_radius::%f luma_strength:%f "
"chroma_radius:%f chroma_pre_filter_radius:%f chroma_strength:%f\n",
sab->luma .radius, sab->luma .pre_filter_radius, sab->luma .strength,
sab->chroma.radius, sab->chroma.pre_filter_radius, sab->chroma.strength);
return 0;
}
static void close_filter_param(FilterParam *f)
{
if (f->pre_filter_context) {
sws_freeContext(f->pre_filter_context);
f->pre_filter_context = NULL;
}
av_freep(&f->pre_filter_buf);
av_freep(&f->dist_coeff);
}
static av_cold void uninit(AVFilterContext *ctx)
{
SabContext *sab = ctx->priv;
close_filter_param(&sab->luma);
close_filter_param(&sab->chroma);
}
static int open_filter_param(FilterParam *f, int width, int height, unsigned int sws_flags)
{
SwsVector *vec;
SwsFilter sws_f;
int i, x, y;
int linesize = FFALIGN(width, 8);
f->pre_filter_buf = av_malloc(linesize * height);
if (!f->pre_filter_buf)
return AVERROR(ENOMEM);
f->pre_filter_linesize = linesize;
vec = sws_getGaussianVec(f->pre_filter_radius, f->quality);
sws_f.lumH = sws_f.lumV = vec;
sws_f.chrH = sws_f.chrV = NULL;
f->pre_filter_context = sws_getContext(width, height, AV_PIX_FMT_GRAY8,
width, height, AV_PIX_FMT_GRAY8,
sws_flags, &sws_f, NULL, NULL);
sws_freeVec(vec);
vec = sws_getGaussianVec(f->strength, 5.0);
for (i = 0; i < COLOR_DIFF_COEFF_SIZE; i++) {
double d;
int index = i-COLOR_DIFF_COEFF_SIZE/2 + vec->length/2;
if (index < 0 || index >= vec->length) d = 0.0;
else d = vec->coeff[index];
f->color_diff_coeff[i] = (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5);
}
sws_freeVec(vec);
vec = sws_getGaussianVec(f->radius, f->quality);
f->dist_width = vec->length;
f->dist_linesize = FFALIGN(vec->length, 8);
f->dist_coeff = av_malloc(f->dist_width * f->dist_linesize * sizeof(*f->dist_coeff));
if (!f->dist_coeff) {
sws_freeVec(vec);
return AVERROR(ENOMEM);
}
for (y = 0; y < vec->length; y++) {
for (x = 0; x < vec->length; x++) {
double d = vec->coeff[x] * vec->coeff[y];
f->dist_coeff[x + y*f->dist_linesize] = (int)(d*(1<<10) + 0.5);
}
}
sws_freeVec(vec);
return 0;
}
static int config_props(AVFilterLink *inlink)
{
SabContext *sab = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;
sab->hsub = desc->log2_chroma_w;
sab->vsub = desc->log2_chroma_h;
close_filter_param(&sab->luma);
ret = open_filter_param(&sab->luma, inlink->w, inlink->h, sab->sws_flags);
if (ret < 0)
return ret;
close_filter_param(&sab->chroma);
ret = open_filter_param(&sab->chroma,
FF_CEIL_RSHIFT(inlink->w, sab->hsub),
FF_CEIL_RSHIFT(inlink->h, sab->vsub), sab->sws_flags);
return ret;
}
#define NB_PLANES 4
static void blur(uint8_t *dst, const int dst_linesize,
const uint8_t *src, const int src_linesize,
const int w, const int h, FilterParam *fp)
{
int x, y;
FilterParam f = *fp;
const int radius = f.dist_width/2;
const uint8_t * const src2[NB_PLANES] = { src };
int src2_linesize[NB_PLANES] = { src_linesize };
uint8_t *dst2[NB_PLANES] = { f.pre_filter_buf };
int dst2_linesize[NB_PLANES] = { f.pre_filter_linesize };
sws_scale(f.pre_filter_context, src2, src2_linesize, 0, h, dst2, dst2_linesize);
#define UPDATE_FACTOR do { \
int factor; \
factor = f.color_diff_coeff[COLOR_DIFF_COEFF_SIZE/2 + pre_val - \
f.pre_filter_buf[ix + iy*f.pre_filter_linesize]] * f.dist_coeff[dx + dy*f.dist_linesize]; \
sum += src[ix + iy*src_linesize] * factor; \
div += factor; \
} while (0)
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
int sum = 0;
int div = 0;
int dy;
const int pre_val = f.pre_filter_buf[x + y*f.pre_filter_linesize];
if (x >= radius && x < w - radius) {
for (dy = 0; dy < radius*2 + 1; dy++) {
int dx;
int iy = y+dy - radius;
if (iy < 0) iy = -iy;
else if (iy >= h) iy = h+h-iy-1;
for (dx = 0; dx < radius*2 + 1; dx++) {
const int ix = x+dx - radius;
UPDATE_FACTOR;
}
}
} else {
for (dy = 0; dy < radius*2+1; dy++) {
int dx;
int iy = y+dy - radius;
if (iy < 0) iy = -iy;
else if (iy >= h) iy = h+h-iy-1;
for (dx = 0; dx < radius*2 + 1; dx++) {
int ix = x+dx - radius;
if (ix < 0) ix = -ix;
else if (ix >= w) ix = w+w-ix-1;
UPDATE_FACTOR;
}
}
}
dst[x + y*dst_linesize] = (sum + div/2) / div;
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
{
SabContext *sab = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFrame *outpic;
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, &sab->luma);
if (inpic->data[2]) {
int cw = FF_CEIL_RSHIFT(inlink->w, sab->hsub);
int ch = FF_CEIL_RSHIFT(inlink->h, sab->vsub);
blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, &sab->chroma);
blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, &sab->chroma);
}
av_frame_free(&inpic);
return ff_filter_frame(outlink, outpic);
}
static const AVFilterPad sab_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_props,
},
{ NULL }
};
static const AVFilterPad sab_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_sab = {
.name = "sab",
.description = NULL_IF_CONFIG_SMALL("Apply shape adaptive blur."),
.priv_size = sizeof(SabContext),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = sab_inputs,
.outputs = sab_outputs,
.priv_class = &sab_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};