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ffmpeg/libavfilter/vf_limitdiff.c

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/*
* Copyright (c) 2021 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
*/
#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
#include "framesync.h"
typedef struct ThreadData {
AVFrame *filtered, *source, *reference, *dst;
} ThreadData;
typedef struct LimitDiffContext {
const AVClass *class;
float threshold;
float elasticity;
int reference;
int planes;
int thr1, thr2;
int linesize[4];
int planewidth[4], planeheight[4];
int nb_planes;
int depth;
FFFrameSync fs;
void (*limitdiff)(const uint8_t *filtered, uint8_t *dst,
const uint8_t *source, const uint8_t *reference,
int thr1, int thr2, int w, int depth);
} LimitDiffContext;
#define OFFSET(x) offsetof(LimitDiffContext, x)
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption limitdiff_options[] = {
{ "threshold", "set the threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=1/255.f}, 0, 1, TFLAGS },
{ "elasticity", "set the elasticity", OFFSET(elasticity), AV_OPT_TYPE_FLOAT, {.dbl=2.f}, 0, 10, TFLAGS },
{ "reference", "enable reference stream", OFFSET(reference), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "planes", "set the planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, TFLAGS },
{ NULL }
};
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
};
static void limitdiff8(const uint8_t *filtered, uint8_t *dst,
const uint8_t *source, const uint8_t *reference,
int thr1, int thr2, int w, int depth)
{
for (int x = 0; x < w; x++) {
const int diff = filtered[x] - source[x];
const int diff_ref = FFABS(filtered[x] - reference[x]);
if (diff_ref <= thr1)
dst[x] = filtered[x];
else if (diff_ref >= thr2)
dst[x] = source[x];
else
dst[x] = av_clip_uint8(source[x] + diff * (thr2 - diff_ref) / (thr2 - thr1));
}
}
static void limitdiff16(const uint8_t *ffiltered, uint8_t *ddst,
const uint8_t *ssource, const uint8_t *rreference,
int thr1, int thr2, int w, int depth)
{
const uint16_t *source = (const uint16_t *)ssource;
const uint16_t *filtered = (const uint16_t *)ffiltered;
const uint16_t *reference = (const uint16_t *)rreference;
uint16_t *dst = (uint16_t *)ddst;
for (int x = 0; x < w; x++) {
const int diff = filtered[x] - source[x];
const int diff_ref = FFABS(filtered[x] - reference[x]);
if (diff_ref <= thr1)
dst[x] = filtered[x];
else if (diff_ref >= thr2)
dst[x] = source[x];
else
dst[x] = av_clip_uintp2_c(source[x] + diff * (thr2 - diff_ref) / (thr2 - thr1), depth);
}
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
LimitDiffContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int vsub, hsub, ret;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
return ret;
hsub = desc->log2_chroma_w;
vsub = desc->log2_chroma_h;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
s->planewidth[0] = s->planewidth[3] = inlink->w;
s->depth = desc->comp[0].depth;
s->thr1 = s->threshold * ((1 << s->depth) - 1);
s->thr2 = s->thr1 * s->elasticity;
if (desc->comp[0].depth == 8)
s->limitdiff = limitdiff8;
else
s->limitdiff = limitdiff16;
return 0;
}
static int limitdiff_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
LimitDiffContext *s = ctx->priv;
const int depth = s->depth;
ThreadData *td = arg;
for (int p = 0; p < s->nb_planes; p++) {
const ptrdiff_t filtered_linesize = td->filtered->linesize[p];
const ptrdiff_t source_linesize = td->source->linesize[p];
const ptrdiff_t reference_linesize = td->reference->linesize[p];
const ptrdiff_t dst_linesize = td->dst->linesize[p];
const int thr1 = s->thr1;
const int thr2 = s->thr2;
const int w = s->planewidth[p];
const int h = s->planeheight[p];
const int slice_start = (h * jobnr) / nb_jobs;
const int slice_end = (h * (jobnr+1)) / nb_jobs;
const uint8_t *filtered = td->filtered->data[p] + slice_start * filtered_linesize;
const uint8_t *source = td->source->data[p] + slice_start * source_linesize;
const uint8_t *reference = td->reference->data[p] + slice_start * reference_linesize;
uint8_t *dst = td->dst->data[p] + slice_start * dst_linesize;
if (!((1 << p) & s->planes)) {
av_image_copy_plane(dst, dst_linesize, filtered, filtered_linesize,
s->linesize[p], slice_end - slice_start);
continue;
}
for (int y = slice_start; y < slice_end; y++) {
s->limitdiff(filtered, dst, source, reference, thr1, thr2, w, depth);
dst += dst_linesize;
filtered += filtered_linesize;
source += source_linesize;
reference += reference_linesize;
}
}
return 0;
}
static int process_frame(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
LimitDiffContext *s = fs->opaque;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out, *filtered, *source, *reference = NULL;
int ret;
if ((ret = ff_framesync_get_frame(&s->fs, 0, &filtered, 0)) < 0 ||
(ret = ff_framesync_get_frame(&s->fs, 1, &source, 0)) < 0)
return ret;
if (s->reference) {
if ((ret = ff_framesync_get_frame(&s->fs, 2, &reference, 0)) < 0)
return ret;
}
if (ctx->is_disabled) {
out = av_frame_clone(filtered);
if (!out)
return AVERROR(ENOMEM);
} else {
ThreadData td;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, filtered);
td.filtered = filtered;
td.source = source;
td.reference = reference ? reference : source;
td.dst = out;
ff_filter_execute(ctx, limitdiff_slice, &td, NULL,
FFMIN(s->planeheight[0], ff_filter_get_nb_threads(ctx)));
}
out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
return ff_filter_frame(outlink, out);
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
LimitDiffContext *s = ctx->priv;
AVFilterLink *filtered = ctx->inputs[0];
AVFilterLink *source = ctx->inputs[1];
FFFrameSyncIn *in;
int ret;
if (filtered->w != source->w || filtered->h != source->h) {
av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
"(size %dx%d) do not match the corresponding "
"second input link %s parameters (%dx%d)\n",
ctx->input_pads[0].name, filtered->w, filtered->h,
ctx->input_pads[1].name, source->w, source->h);
return AVERROR(EINVAL);
}
if (s->reference) {
AVFilterLink *reference = ctx->inputs[2];
if (filtered->w != reference->w || filtered->h != reference->h) {
av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
"(size %dx%d) do not match the corresponding "
"third input link %s parameters (%dx%d)\n",
ctx->input_pads[0].name, filtered->w, filtered->h,
ctx->input_pads[1].name, reference->w, reference->h);
return AVERROR(EINVAL);
}
}
outlink->w = filtered->w;
outlink->h = filtered->h;
outlink->sample_aspect_ratio = filtered->sample_aspect_ratio;
outlink->frame_rate = filtered->frame_rate;
if ((ret = ff_framesync_init(&s->fs, ctx, 2 + !!s->reference)) < 0)
return ret;
in = s->fs.in;
in[0].time_base = filtered->time_base;
in[1].time_base = source->time_base;
if (s->reference)
in[2].time_base = ctx->inputs[2]->time_base;
in[0].sync = 1;
in[0].before = EXT_STOP;
in[0].after = EXT_INFINITY;
in[1].sync = 1;
in[1].before = EXT_STOP;
in[1].after = EXT_INFINITY;
if (s->reference) {
in[2].sync = 1;
in[2].before = EXT_STOP;
in[2].after = EXT_INFINITY;
}
s->fs.opaque = s;
s->fs.on_event = process_frame;
ret = ff_framesync_configure(&s->fs);
outlink->time_base = s->fs.time_base;
return ret;
}
static int activate(AVFilterContext *ctx)
{
LimitDiffContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
static av_cold int init(AVFilterContext *ctx)
{
const LimitDiffContext *s = ctx->priv;
AVFilterPad pad = {
.name = "filtered",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
};
int ret;
if ((ret = ff_append_inpad(ctx, &pad)) < 0)
return ret;
pad.name = "source";
pad.config_props = NULL;
if ((ret = ff_append_inpad(ctx, &pad)) < 0)
return ret;
if (s->reference) {
pad.name = "reference";
pad.config_props = NULL;
if ((ret = ff_append_inpad(ctx, &pad)) < 0)
return ret;
}
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
LimitDiffContext *s = ctx->priv;
ff_framesync_uninit(&s->fs);
}
static const AVFilterPad limitdiff_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
AVFILTER_DEFINE_CLASS(limitdiff);
const AVFilter ff_vf_limitdiff = {
.name = "limitdiff",
.description = NULL_IF_CONFIG_SMALL("Apply filtering with limiting difference."),
.priv_class = &limitdiff_class,
.priv_size = sizeof(LimitDiffContext),
.init = init,
.uninit = uninit,
.activate = activate,
FILTER_OUTPUTS(limitdiff_outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
AVFILTER_FLAG_SLICE_THREADS |
AVFILTER_FLAG_DYNAMIC_INPUTS,
.process_command = ff_filter_process_command,
};
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