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/*
* Copyright (C) 2019 Leo Zhang <leozhang@qiyi.com>
* 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
*/
/**
* @file
* yaep(yet another edge preserving) blur filter
*
* This implementation is based on an algorithm described in
* "J. S. Lee, Digital image enhancement and noise filtering by use of local statistics, IEEE Trans. Pattern
* Anal. Mach. Intell. PAMI-2, 1980."
*/
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "internal.h"
typedef struct YAEPContext {
const AVClass *class;
int planes;
int radius;
int sigma;
int nb_planes;
int planewidth[4];
int planeheight[4];
int depth;
uint64_t *sat; ///< summed area table
uint64_t *square_sat; ///< square summed area table
int sat_linesize;
int (*pre_calculate_row)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
int (*filter_slice )(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} YAEPContext;
static av_cold void uninit(AVFilterContext *ctx)
{
YAEPContext *s = ctx->priv;
av_freep(&s->sat);
av_freep(&s->square_sat);
}
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_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_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_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_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
typedef struct ThreadData {
int width;
int height;
int src_linesize;
int dst_linesize;
uint8_t *src;
uint8_t *dst;
} ThreadData;
#define PRE_CALCULATE_ROW(type, name) \
static int pre_calculate_row_##name(AVFilterContext *ctx, void *arg, \
int jobnr, int nb_jobs) \
{ \
ThreadData *td = arg; \
YAEPContext *s = ctx->priv; \
\
const int width = td->width; \
const int height = td->height; \
const int linesize = td->src_linesize / sizeof(type); \
const int sat_linesize = s->sat_linesize; \
\
const int starty = height * jobnr / nb_jobs; \
const int endy = height * (jobnr+1) / nb_jobs; \
\
uint64_t *sat = s->sat + (starty + 1) * sat_linesize; \
uint64_t *square_sat = s->square_sat + (starty + 1) * sat_linesize; \
const type *src = (const type *)td->src + starty * linesize; \
\
int x, y; \
\
for (y = starty; y < endy; y++) { \
for (x = 0; x < width; x++) { \
sat[x+1] = sat[x] + src[x]; \
square_sat[x+1] = square_sat[x] + (uint64_t)src[x] * src[x]; \
} \
sat += sat_linesize; \
square_sat += sat_linesize; \
src += linesize; \
} \
\
return 0; \
}
PRE_CALCULATE_ROW(uint8_t, byte)
PRE_CALCULATE_ROW(uint16_t, word)
static int pre_calculate_col(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs)
{
ThreadData *td = arg;
YAEPContext *s = ctx->priv;
const int width = td->width;
const int height = td->height;
const int sat_linesize = s->sat_linesize;
const int startx = width * jobnr / nb_jobs;
const int endx = width * (jobnr + 1) / nb_jobs;
uint64_t *sat, *square_sat;
int x, y;
for (x = startx; x < endx; x++) {
sat = s->sat + x + 1;
square_sat = s->square_sat + x + 1;
for (y = 0; y < height; y++) {
*(sat+sat_linesize) += *sat;
*(square_sat+sat_linesize) += *square_sat;
sat += sat_linesize;
square_sat += sat_linesize;
}
}
return 0;
}
#define FILTER_SLICE(type, name) \
static int filter_slice_##name(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
{ \
ThreadData *td = arg; \
YAEPContext *s = ctx->priv; \
\
const int width = td->width; \
const int height = td->height; \
const int src_linesize = td->src_linesize / sizeof(type); \
const int dst_linesize = td->dst_linesize / sizeof(type); \
const int sat_linesize = s->sat_linesize; \
const int sigma = s->sigma; \
const int radius = s->radius; \
\
uint64_t *sat = s->sat; \
uint64_t *square_sat = s->square_sat; \
const type *src = (const type *)td->src; \
type *dst = (type *)td->dst; \
\
const int starty = height * jobnr / nb_jobs; \
const int endy = height * (jobnr + 1) / nb_jobs; \
\
int x, y; \
int lower_x, higher_x; \
int lower_y, higher_y; \
int dist_y, count; \
uint64_t sum, square_sum, mean, var; \
\
for (y = starty; y < endy; y++) { \
lower_y = y - radius < 0 ? 0 : y - radius; \
higher_y = y + radius + 1 > height ? height : y + radius + 1; \
dist_y = higher_y - lower_y; \
for (x = 0; x < width; x++) { \
lower_x = x - radius < 0 ? 0 : x - radius; \
higher_x = x + radius + 1 > width ? width : x + radius + 1; \
count = dist_y * (higher_x - lower_x); \
sum = sat[higher_y * sat_linesize + higher_x] \
- sat[higher_y * sat_linesize + lower_x] \
- sat[lower_y * sat_linesize + higher_x] \
+ sat[lower_y * sat_linesize + lower_x]; \
square_sum = square_sat[higher_y * sat_linesize + higher_x] \
- square_sat[higher_y * sat_linesize + lower_x] \
- square_sat[lower_y * sat_linesize + higher_x] \
+ square_sat[lower_y * sat_linesize + lower_x]; \
mean = sum / count; \
var = (square_sum - sum * sum / count) / count; \
dst[y * dst_linesize + x] = (sigma * mean + var * src[y * src_linesize + x]) / (sigma + var); \
} \
} \
return 0; \
}
FILTER_SLICE(uint8_t, byte)
FILTER_SLICE(uint16_t, word)
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
YAEPContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
int plane;
const int nb_threads = ff_filter_get_nb_threads(ctx);
ThreadData td;
if (av_frame_is_writable(in)) {
out = in;
} else {
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);
}
for (plane = 0; plane < s->nb_planes; plane++) {
if (!s->radius || !(s->planes & (1<<plane))) {
if (out != in) {
av_image_copy_plane(out->data[plane], out->linesize[plane],
in->data[plane], in->linesize[plane],
s->planewidth[plane] * ((s->depth + 7) / 8),
s->planeheight[plane]);
}
continue;
}
td.width = s->planewidth[plane];
td.height = s->planeheight[plane];
td.src = in->data[plane];
td.src_linesize = in->linesize[plane];
ff_filter_execute(ctx, s->pre_calculate_row, &td, NULL,
FFMIN(td.height, nb_threads));
ff_filter_execute(ctx, pre_calculate_col, &td, NULL,
FFMIN(td.width, nb_threads));
td.dst = out->data[plane];
td.dst_linesize = out->linesize[plane];
ff_filter_execute(ctx, s->filter_slice, &td, NULL,
FFMIN(td.height, nb_threads));
}
if (out != in)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int config_input(AVFilterLink *inlink)
{
YAEPContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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->nb_planes = av_pix_fmt_count_planes(inlink->format);
s->radius = FFMIN(s->radius, AV_CEIL_RSHIFT(FFMIN(inlink->w, inlink->h), 1));
if (s->depth <= 8) {
s->pre_calculate_row = pre_calculate_row_byte;
s->filter_slice = filter_slice_byte;
} else {
s->pre_calculate_row = pre_calculate_row_word;
s->filter_slice = filter_slice_word;
}
// padding one row on the top, and padding one col on the left, that is why + 1 below
s->sat_linesize = inlink->w + 1;
s->sat = av_calloc(inlink->h + 1, s->sat_linesize * sizeof(*s->sat));
if (!s->sat)
return AVERROR(ENOMEM);
s->square_sat = av_calloc(inlink->h + 1, s->sat_linesize * sizeof(*s->square_sat));
if (!s->square_sat)
return AVERROR(ENOMEM);
return 0;
}
static const AVFilterPad yaep_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
static const AVFilterPad yaep_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
#define OFFSET(x) offsetof(YAEPContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption yaepblur_options[] = {
{ "radius", "set window radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=3}, 0, INT_MAX, .flags=FLAGS },
{ "r" , "set window radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=3}, 0, INT_MAX, .flags=FLAGS },
{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=1}, 0, 0xF, .flags=FLAGS },
{ "p", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=1}, 0, 0xF, .flags=FLAGS },
{ "sigma", "set blur strength", OFFSET(sigma), AV_OPT_TYPE_INT, {.i64=128}, 1, INT_MAX, .flags=FLAGS },
{ "s", "set blur strength", OFFSET(sigma), AV_OPT_TYPE_INT, {.i64=128}, 1, INT_MAX, .flags=FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(yaepblur);
const AVFilter ff_vf_yaepblur = {
.name = "yaepblur",
.description = NULL_IF_CONFIG_SMALL("Yet another edge preserving blur filter."),
.priv_size = sizeof(YAEPContext),
.priv_class = &yaepblur_class,
.uninit = uninit,
FILTER_INPUTS(yaep_inputs),
FILTER_OUTPUTS(yaep_outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = ff_filter_process_command,
};
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