[FFmpeg-devel] [PATCH 1/2] avfilter: add limitdiff video filter
Paul B Mahol
onemda at gmail.com
Fri Oct 8 12:57:35 EEST 2021
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 31 ++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_limitdiff.c | 370 +++++++++++++++++++++++++++++++++++++
4 files changed, 403 insertions(+)
create mode 100644 libavfilter/vf_limitdiff.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 633c64c0ea..2bd72b9303 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -14544,6 +14544,37 @@ ffmpeg -i main.mpg -i ref.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];
@end example
@end itemize
+ at section limitdiff
+Apply limited difference filter using second and optionally third video stream.
+
+The filter accepts the following options:
+
+ at table @option
+ at item threshold
+Set the threshold to use when allowing certain differences between video streams.
+Any absolute difference value lower or exact than this threshold will pick pixel components from
+first video stream.
+
+ at item elasticity
+Set the elasticity of soft thresholding when processing video streams.
+This value multiplied with first one sets second threshold.
+Any absolute difference value greater or exact than second threshold will pick pixel components
+from second video stream. For values between those two threshold
+linear interpolation between first and second video stream will be used.
+
+ at item reference
+Enable the reference (third) video stream processing. By default is disabled.
+If set, this video stream will be used for calculating absolute difference with first video
+stream.
+
+ at item planes
+Specify which planes will be processed. Defaults to all available.
+ at end table
+
+ at subsection Commands
+
+This filter supports the all above options as @ref{commands} except option @samp{reference}.
+
@section limiter
Limits the pixel components values to the specified range [min, max].
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index aec7da3f26..d22fcb574c 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -324,6 +324,7 @@ OBJS-$(CONFIG_LATENCY_FILTER) += f_latency.o
OBJS-$(CONFIG_LENSCORRECTION_FILTER) += vf_lenscorrection.o
OBJS-$(CONFIG_LENSFUN_FILTER) += vf_lensfun.o
OBJS-$(CONFIG_LIBVMAF_FILTER) += vf_libvmaf.o framesync.o
+OBJS-$(CONFIG_LIMITDIFF_FILTER) += vf_limitdiff.o framesync.o
OBJS-$(CONFIG_LIMITER_FILTER) += vf_limiter.o
OBJS-$(CONFIG_LOOP_FILTER) += f_loop.o
OBJS-$(CONFIG_LUMAKEY_FILTER) += vf_lumakey.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 2da3ccaa59..95e34d97c6 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -309,6 +309,7 @@ extern const AVFilter ff_vf_latency;
extern const AVFilter ff_vf_lenscorrection;
extern const AVFilter ff_vf_lensfun;
extern const AVFilter ff_vf_libvmaf;
+extern const AVFilter ff_vf_limitdiff;
extern const AVFilter ff_vf_limiter;
extern const AVFilter ff_vf_loop;
extern const AVFilter ff_vf_lumakey;
diff --git a/libavfilter/vf_limitdiff.c b/libavfilter/vf_limitdiff.c
new file mode 100644
index 0000000000..d2688c39f4
--- /dev/null
+++ b/libavfilter/vf_limitdiff.c
@@ -0,0 +1,370 @@
+/*
+ * 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 "formats.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,
+};
--
2.33.0
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