[FFmpeg-devel] [PATCH] avfilter: add varblur video filter
Paul B Mahol
onemda at gmail.com
Mon Oct 11 23:55:33 EEST 2021
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 15 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_varblur.c | 362 +++++++++++++++++++++++++++++++++++++++
4 files changed, 379 insertions(+)
create mode 100644 libavfilter/vf_varblur.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 5e7326d2f2..4a28c1f828 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -21731,6 +21731,21 @@ Threshold used depends also on each decomposition coefficients.
Default is universal.
@end table
+ at section varblur
+Apply variable blur filter by using 2nd video stream to set blur radius.
+
+This filter accepts the following options:
+
+ at table @option
+ at item min_r
+Set min allowed radius. By default is 0. Allowed range is from 0 to 254.
+ at item max_r
+Set max allowed radius. By default is 8. Allowed range is from 1 to 255.
+ at item planes
+ at item planes
+Set which planes to process. By default all are used.
+ at end table
+
@section vectorscope
Display 2 color component values in the two dimensional graph (which is called
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index da2c8b7a5e..358f121cb4 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -486,6 +486,7 @@ OBJS-$(CONFIG_UNTILE_FILTER) += vf_untile.o
OBJS-$(CONFIG_USPP_FILTER) += vf_uspp.o qp_table.o
OBJS-$(CONFIG_V360_FILTER) += vf_v360.o
OBJS-$(CONFIG_VAGUEDENOISER_FILTER) += vf_vaguedenoiser.o
+OBJS-$(CONFIG_VARBLUR_FILTER) += vf_varblur.o framesync.o
OBJS-$(CONFIG_VECTORSCOPE_FILTER) += vf_vectorscope.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o
OBJS-$(CONFIG_VFRDET_FILTER) += vf_vfrdet.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 81e1b0965b..409ab5d3c4 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -463,6 +463,7 @@ extern const AVFilter ff_vf_untile;
extern const AVFilter ff_vf_uspp;
extern const AVFilter ff_vf_v360;
extern const AVFilter ff_vf_vaguedenoiser;
+extern const AVFilter ff_vf_varblur;
extern const AVFilter ff_vf_vectorscope;
extern const AVFilter ff_vf_vflip;
extern const AVFilter ff_vf_vfrdet;
diff --git a/libavfilter/vf_varblur.c b/libavfilter/vf_varblur.c
new file mode 100644
index 0000000000..8ac568f55e
--- /dev/null
+++ b/libavfilter/vf_varblur.c
@@ -0,0 +1,362 @@
+/*
+ * 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/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "framesync.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct VarBlurContext {
+ const AVClass *class;
+ FFFrameSync fs;
+
+ int min_radius;
+ int max_radius;
+ int planes;
+
+ int depth;
+ int planewidth[4];
+ int planeheight[4];
+
+ AVFrame *sat;
+ int nb_planes;
+
+ int (*blur_plane)(AVFilterContext *s, void *arg,
+ int jobnr, int nb_jobs);
+} VarBlurContext;
+
+#define OFFSET(x) offsetof(VarBlurContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
+
+static const AVOption varblur_options[] = {
+ { "min_r", "set min blur radius", OFFSET(min_radius), AV_OPT_TYPE_INT, {.i64=0}, 0, 254, FLAGS },
+ { "max_r", "set max blur radius", OFFSET(max_radius), AV_OPT_TYPE_INT, {.i64=8}, 1, 255, FLAGS },
+ { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
+ { NULL }
+};
+
+FRAMESYNC_DEFINE_CLASS(varblur, VarBlurContext, fs);
+
+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
+};
+
+#define COMPUTE_SAT(type, stype, depth) \
+static void compute_sat##depth(const uint8_t *ssrc, \
+ int linesize, \
+ int w, int h, \
+ const uint8_t *dstp, \
+ int dst_linesize) \
+{ \
+ const type *src = (const type *)ssrc; \
+ stype *dst = (stype *)dstp; \
+ \
+ linesize /= (depth / 8); \
+ dst_linesize /= (depth / 2); \
+ dst += dst_linesize; \
+ \
+ for (int y = 0; y < h; y++) { \
+ stype sum = 0; \
+ \
+ for (int x = 1; x < w; x++) { \
+ sum += src[x - 1]; \
+ dst[x] = sum + dst[x - dst_linesize]; \
+ } \
+ \
+ src += linesize; \
+ dst += dst_linesize; \
+ } \
+}
+
+COMPUTE_SAT(uint8_t, uint32_t, 8)
+COMPUTE_SAT(uint16_t, uint64_t, 16)
+
+typedef struct ThreadData {
+ uint8_t *dst;
+ int dst_linesize;
+ const uint8_t *rptr;
+ int rptr_linesize;
+ int w, h;
+ const uint8_t *ptr;
+ int ptr_linesize;
+} ThreadData;
+
+static float lerpf(float v0, float v1, float f)
+{
+ return v0 + (v1 - v0) * f;
+}
+
+#define BLUR_PLANE(type, stype, bits) \
+static int blur_plane##bits(AVFilterContext *ctx, void *arg, \
+ int jobnr, int nb_jobs) \
+{ \
+ VarBlurContext *s = ctx->priv; \
+ const int ddepth = s->depth; \
+ ThreadData *td = arg; \
+ const int w = td->w, h = td->h; \
+ const int slice_start = (h * jobnr) / nb_jobs; \
+ const int slice_end = (h * (jobnr+1)) / nb_jobs; \
+ const int dst_linesize = td->dst_linesize / (bits / 8); \
+ const int ptr_linesize = td->ptr_linesize / (bits / 2); \
+ const int rptr_linesize = td->rptr_linesize / (bits / 8); \
+ const type *rptr = (const type *)td->rptr + slice_start * rptr_linesize; \
+ type *dst = (type *)td->dst + slice_start * dst_linesize; \
+ const stype *ptr = (stype *)td->ptr; \
+ const float minr = 2.f * s->min_radius + 1.f; \
+ const float maxr = 2.f * s->max_radius + 1.f; \
+ const float scaler = (maxr - minr) / ((1 << ddepth) - 1); \
+ \
+ for (int y = slice_start; y < slice_end; y++) { \
+ for (int x = 0; x < w; x++) { \
+ const float radiusf = minr + (FFMAX(0.f, 2 * rptr[x] + 1 - minr)) * scaler; \
+ const int radius = floorf(radiusf); \
+ const float factor = radiusf - radius; \
+ const int nradius = radius + 1; \
+ const int l = FFMIN(radius, x); \
+ const int r = FFMIN(radius, w - x - 1); \
+ const int t = FFMIN(radius, y); \
+ const int b = FFMIN(radius, h - y - 1); \
+ const int nl = FFMIN(nradius, x); \
+ const int nr = FFMIN(nradius, w - x - 1); \
+ const int nt = FFMIN(nradius, y); \
+ const int nb = FFMIN(nradius, h - y - 1); \
+ stype tl = ptr[(y - t) * ptr_linesize + x - l]; \
+ stype tr = ptr[(y - t) * ptr_linesize + x + r]; \
+ stype bl = ptr[(y + b) * ptr_linesize + x - l]; \
+ stype br = ptr[(y + b) * ptr_linesize + x + r]; \
+ stype ntl = ptr[(y - nt) * ptr_linesize + x - nl]; \
+ stype ntr = ptr[(y - nt) * ptr_linesize + x + nr]; \
+ stype nbl = ptr[(y + nb) * ptr_linesize + x - nl]; \
+ stype nbr = ptr[(y + nb) * ptr_linesize + x + nr]; \
+ stype div = (l + r) * (t + b); \
+ stype ndiv = (nl + nr) * (nt + nb); \
+ stype p0 = (br + tl - bl - tr) / div; \
+ stype n0 = (nbr + ntl - nbl - ntr) / ndiv; \
+ \
+ dst[x] = av_clip_uintp2_c(lerpf(p0, n0, factor), \
+ ddepth); \
+ } \
+ \
+ rptr += rptr_linesize; \
+ dst += dst_linesize; \
+ } \
+ \
+ return 0; \
+}
+
+BLUR_PLANE(uint8_t, uint32_t, 8)
+BLUR_PLANE(uint16_t, uint64_t, 16)
+
+static int blur_frame(AVFilterContext *ctx, AVFrame *in, AVFrame *radius)
+{
+ VarBlurContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ ThreadData td;
+ AVFrame *out;
+
+ 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 (int plane = 0; plane < s->nb_planes; plane++) {
+ const int height = s->planeheight[plane];
+ const int width = s->planewidth[plane];
+ const int linesize = in->linesize[plane];
+ const int dst_linesize = out->linesize[plane];
+ const uint8_t *rptr = radius->data[plane];
+ const int rptr_linesize = radius->linesize[plane];
+ uint8_t *ptr = s->sat->data[plane];
+ const int ptr_linesize = s->sat->linesize[plane];
+ const uint8_t *src = in->data[plane];
+ uint8_t *dst = out->data[plane];
+
+ if (!(s->planes & (1 << plane))) {
+ if (out != in)
+ av_image_copy_plane(out->data[plane], out->linesize[plane],
+ in->data[plane], in->linesize[plane],
+ width * ((s->depth + 7) / 8), height);
+ continue;
+ }
+
+ if (s->depth <= 8)
+ compute_sat8(src, linesize, width, height, ptr, ptr_linesize);
+ else
+ compute_sat16(src, linesize, width, height, ptr, ptr_linesize);
+
+ td.dst = dst;
+ td.dst_linesize = dst_linesize;
+ td.ptr = ptr;
+ td.ptr_linesize = ptr_linesize;
+ td.rptr = rptr;
+ td.rptr_linesize = rptr_linesize;
+ td.w = width;
+ td.h = height;
+ ff_filter_execute(ctx, s->blur_plane, &td, NULL,
+ FFMIN(height, ff_filter_get_nb_threads(ctx)));
+ }
+
+ if (out != in)
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, out);
+}
+
+static int activate(AVFilterContext *ctx)
+{
+ VarBlurContext *s = ctx->priv;
+ return ff_framesync_activate(&s->fs);
+}
+
+static int varblur_frame(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ VarBlurContext *s = ctx->priv;
+ AVFrame *in, *radius;
+ int ret;
+
+ if (s->max_radius <= s->min_radius)
+ s->max_radius = s->min_radius + 1;
+
+ ret = ff_framesync_dualinput_get(fs, &in, &radius);
+ if (ret < 0)
+ return ret;
+ if (!radius)
+ return ff_filter_frame(ctx->outputs[0], in);
+ return blur_frame(ctx, in, radius);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AVFilterLink *inlink = ctx->inputs[0];
+ AVFilterLink *radiuslink = ctx->inputs[1];
+ VarBlurContext *s = ctx->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
+ int ret;
+
+ if (inlink->w != radiuslink->w || inlink->h != radiuslink->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 (size %dx%d)\n",
+ ctx->input_pads[0].name, inlink->w, inlink->h,
+ ctx->input_pads[1].name, radiuslink->w, radiuslink->h);
+ return AVERROR(EINVAL);
+ }
+
+ outlink->w = inlink->w;
+ outlink->h = inlink->h;
+ outlink->time_base = inlink->time_base;
+ outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
+ outlink->frame_rate = inlink->frame_rate;
+
+ s->depth = desc->comp[0].depth;
+ s->blur_plane = s->depth <= 8 ? blur_plane8 : blur_plane16;
+
+ s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(outlink->w, desc->log2_chroma_w);
+ s->planewidth[0] = s->planewidth[3] = outlink->w;
+ s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(outlink->h, desc->log2_chroma_h);
+ s->planeheight[0] = s->planeheight[3] = outlink->h;
+
+ s->nb_planes = av_pix_fmt_count_planes(outlink->format);
+
+ s->sat = ff_get_video_buffer(outlink, (outlink->w + 1) * 4 * ((s->depth + 7) / 8), outlink->h + 1);
+ if (!s->sat)
+ return AVERROR(ENOMEM);
+
+ s->fs.on_event = varblur_frame;
+ if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
+ return ret;
+
+ ret = ff_framesync_configure(&s->fs);
+ outlink->time_base = s->fs.time_base;
+
+ return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ VarBlurContext *s = ctx->priv;
+
+ ff_framesync_uninit(&s->fs);
+ av_frame_free(&s->sat);
+}
+
+static const AVFilterPad varblur_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ {
+ .name = "radius",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+};
+
+static const AVFilterPad varblur_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+};
+
+const AVFilter ff_vf_varblur = {
+ .name = "varblur",
+ .description = NULL_IF_CONFIG_SMALL("Apply Variable Blur filter."),
+ .priv_size = sizeof(VarBlurContext),
+ .priv_class = &varblur_class,
+ .activate = activate,
+ .preinit = varblur_framesync_preinit,
+ .uninit = uninit,
+ FILTER_INPUTS(varblur_inputs),
+ FILTER_OUTPUTS(varblur_outputs),
+ FILTER_PIXFMTS_ARRAY(pix_fmts),
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
+ AVFILTER_FLAG_SLICE_THREADS,
+ .process_command = ff_filter_process_command,
+};
--
2.33.0
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