[FFmpeg-devel] [PATCH] avfilter: add generic FFT video convolve filter
Paul B Mahol
onemda at gmail.com
Sat Sep 2 22:32:17 EEST 2017
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 11 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_convolve.c | 360 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 373 insertions(+)
create mode 100644 libavfilter/vf_convolve.c
diff --git a/doc/filters.texi b/doc/filters.texi
index afcb99d..078fd32 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -5867,6 +5867,17 @@ For example to convert the input to SMPTE-240M, use the command:
colorspace=smpte240m
@end example
+ at section convolve
+
+Apply 2D convolution of video stream in frequency domain using second stream as impulse.
+
+The filter accepts the following options:
+
+ at table @option
+ at item planes
+Set which planes to process.
+ at end table
+
@section convolution
Apply convolution 3x3 or 5x5 filter.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index ee840b0..d76d57c 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -149,6 +149,7 @@ OBJS-$(CONFIG_COLORLEVELS_FILTER) += vf_colorlevels.o
OBJS-$(CONFIG_COLORMATRIX_FILTER) += vf_colormatrix.o
OBJS-$(CONFIG_COLORSPACE_FILTER) += vf_colorspace.o colorspacedsp.o
OBJS-$(CONFIG_CONVOLUTION_FILTER) += vf_convolution.o
+OBJS-$(CONFIG_CONVOLVE_FILTER) += vf_convolve.o
OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
OBJS-$(CONFIG_COREIMAGE_FILTER) += vf_coreimage.o
OBJS-$(CONFIG_COVER_RECT_FILTER) += vf_cover_rect.o lavfutils.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 8b9b9a4..890a7b8 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -161,6 +161,7 @@ static void register_all(void)
REGISTER_FILTER(COLORMATRIX, colormatrix, vf);
REGISTER_FILTER(COLORSPACE, colorspace, vf);
REGISTER_FILTER(CONVOLUTION, convolution, vf);
+ REGISTER_FILTER(CONVOLVE, convolve, vf);
REGISTER_FILTER(COPY, copy, vf);
REGISTER_FILTER(COREIMAGE, coreimage, vf);
REGISTER_FILTER(COVER_RECT, cover_rect, vf);
diff --git a/libavfilter/vf_convolve.c b/libavfilter/vf_convolve.c
new file mode 100644
index 0000000..925d03e
--- /dev/null
+++ b/libavfilter/vf_convolve.c
@@ -0,0 +1,360 @@
+/*
+ * Copyright (c) 2017 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 "libavcodec/avfft.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "framesync2.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct ConvolveContext {
+ const AVClass *class;
+ FFFrameSync fs;
+
+ FFTContext *fft[4];
+ FFTContext *ifft[4];
+
+ int n[4];
+ int fft_bits[4];
+ int fft_len[4];
+ int planewidth[4];
+ int planeheight[4];
+
+ FFTComplex *fft_hdata[4];
+ FFTComplex *fft_vdata[4];
+ FFTComplex *fft_hdata_impulse[4];
+ FFTComplex *fft_vdata_impulse[4];
+
+ int planes;
+} ConvolveContext;
+
+#define OFFSET(x) offsetof(ConvolveContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption convolve_options[] = {
+ { "planes", "set planes to convolve", OFFSET(planes), AV_OPT_TYPE_INT, {.i64 = 15}, 0, 15, FLAGS },
+ { NULL },
+};
+
+FRAMESYNC_DEFINE_CLASS(convolve, ConvolveContext, fs);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pixel_fmts_fftfilt[] = {
+ AV_PIX_FMT_GRAY8,
+ AV_PIX_FMT_GBRP,
+ AV_PIX_FMT_YUV420P,
+ AV_PIX_FMT_YUV444P,
+ AV_PIX_FMT_NONE
+ };
+
+ AVFilterFormats *fmts_list = ff_make_format_list(pixel_fmts_fftfilt);
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+static int config_input_main(AVFilterLink *inlink)
+{
+ ConvolveContext *s = inlink->dst->priv;
+ int fft_bits, i;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+
+ 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;
+
+ for (i = 0; i < desc->nb_components; i++) {
+ int w = s->planewidth[i];
+ int h = s->planeheight[i];
+ int n = FFMAX(w, h) + FFMIN(w, h) / 2;
+
+ for (fft_bits = 1; 1 << fft_bits < n; fft_bits++);
+
+ s->fft_bits[i] = fft_bits;
+ s->n[i] = n;
+
+ s->fft_len[i] = 1 << s->fft_bits[i];
+
+ if (!(s->fft_hdata[i] = av_calloc(n, s->fft_len[i] * sizeof(FFTComplex))))
+ return AVERROR(ENOMEM);
+
+ if (!(s->fft_vdata[i] = av_calloc(s->fft_len[i], s->fft_len[i] * sizeof(FFTComplex))))
+ return AVERROR(ENOMEM);
+
+ if (!(s->fft_hdata_impulse[i] = av_calloc(n, s->fft_len[i] * sizeof(FFTComplex))))
+ return AVERROR(ENOMEM);
+
+ if (!(s->fft_vdata_impulse[i] = av_calloc(s->fft_len[i], s->fft_len[i] * sizeof(FFTComplex))))
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+static int config_input_impulse(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+
+ if (ctx->inputs[0]->w != ctx->inputs[1]->w ||
+ ctx->inputs[0]->h != ctx->inputs[1]->h) {
+ av_log(ctx, AV_LOG_ERROR, "Width and height of input videos must be same.\n");
+ return AVERROR(EINVAL);
+ }
+ if (ctx->inputs[0]->format != ctx->inputs[1]->format) {
+ av_log(ctx, AV_LOG_ERROR, "Inputs must be of same pixel format.\n");
+ return AVERROR(EINVAL);
+ }
+
+ return 0;
+}
+
+static void fft_horizontal(ConvolveContext *s, FFTComplex *fft_hdata, int fft_len,
+ AVFrame *in, int w, int h, int n, int plane, float scale)
+{
+ int y, x;
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ fft_hdata[y * fft_len + x].re = in->data[plane][in->linesize[plane]*y+x] * scale;
+ fft_hdata[y * fft_len + x].im = 0;
+ }
+ for (; x < fft_len; x++) {
+ fft_hdata[y * fft_len + x].re = 0;
+ fft_hdata[y * fft_len + x].im = 0;
+ }
+
+ av_fft_permute(s->fft[plane], fft_hdata + y * fft_len);
+ av_fft_calc(s->fft[plane], fft_hdata + y * fft_len);
+ }
+
+ for (; y < n; y++) {
+ for (x = 0; x < fft_len; x++) {
+ fft_hdata[y * fft_len + x].re = 0;
+ fft_hdata[y * fft_len + x].im = 0;
+ }
+ }
+}
+
+static void fft_vertical(ConvolveContext *s, FFTComplex *fft_hdata, FFTComplex *fft_vdata,
+ int fft_len, int h, int plane)
+{
+ int y, x;
+
+ for (y = 0; y < fft_len; y++) {
+ for (x = 0; x < h; x++) {
+ fft_vdata[y * fft_len + x].re = fft_hdata[x * fft_len + y].re;
+ fft_vdata[y * fft_len + x].im = fft_hdata[x * fft_len + y].im;
+ }
+ for (; x < fft_len; x++) {
+ fft_vdata[y * fft_len + x].re = 0;
+ fft_vdata[y * fft_len + x].im = 0;
+ }
+ av_fft_permute(s->fft[plane], fft_vdata + y * fft_len);
+ av_fft_calc(s->fft[plane], fft_vdata + y * fft_len);
+ }
+}
+
+static void ifft_vertical(ConvolveContext *s, int fft_len, int h, int plane)
+{
+ int y, x;
+
+ for (y = 0; y < fft_len; y++) {
+ av_fft_permute(s->ifft[plane], s->fft_vdata[plane] + y * fft_len);
+ av_fft_calc(s->ifft[plane], s->fft_vdata[plane] + y * fft_len);
+ for (x = 0; x < h; x++) {
+ s->fft_hdata[plane][x * fft_len + y].re = s->fft_vdata[plane][y * fft_len + x].re;
+ s->fft_hdata[plane][x * fft_len + y].im = s->fft_vdata[plane][y * fft_len + x].im;
+ }
+ }
+}
+
+static void ifft_horizontal(ConvolveContext *s, AVFrame *out, int fft_len,
+ int w, int h, int n, int plane)
+{
+ const float scale = 1.f / (fft_len * fft_len);
+ int y, x;
+
+ for (y = 0; y < n; y++) {
+ av_fft_permute(s->ifft[plane], s->fft_hdata[plane] + y * fft_len);
+ av_fft_calc(s->ifft[plane], s->fft_hdata[plane] + y * fft_len);
+ }
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++)
+ out->data[plane][out->linesize[plane] * y + x] =
+ av_clip(s->fft_hdata[plane][(y+h/2)* fft_len + x + w/2].re * scale, 0, 255);
+ }
+}
+
+static int do_convolve(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ AVFilterLink *outlink = ctx->outputs[0];
+ const AVPixFmtDescriptor *desc;
+ ConvolveContext *s = ctx->priv;
+ AVFrame *mainpic = NULL, *impulsepic = NULL;
+ int ret, y, x, plane;
+
+ ret = ff_framesync2_dualinput_get(fs, &mainpic, &impulsepic);
+ if (ret < 0)
+ return ret;
+ if (!impulsepic)
+ return ff_filter_frame(ctx->outputs[0], mainpic);
+
+ desc = av_pix_fmt_desc_get(outlink->format);
+ for (plane = 0; plane < desc->nb_components; plane++) {
+ const int fft_len = s->fft_len[plane];
+ int w = s->planewidth[plane];
+ int h = s->planeheight[plane];
+ int n = s->n[plane];
+ float total = 0;
+
+ if (!(s->planes & (1 << plane)))
+ continue;
+
+ fft_horizontal(s, s->fft_hdata[plane], fft_len, mainpic, w, h, n, plane, 1.f);
+ fft_vertical(s, s->fft_hdata[plane], s->fft_vdata[plane],
+ fft_len, n, plane);
+
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++) {
+ total += impulsepic->data[plane][y * impulsepic->linesize[plane] + x];
+ }
+ }
+ total = FFMAX(1, total);
+
+ fft_horizontal(s, s->fft_hdata_impulse[plane], fft_len, impulsepic, w, h, n, plane, 1 / total);
+ fft_vertical(s, s->fft_hdata_impulse[plane], s->fft_vdata_impulse[plane],
+ fft_len, n, plane);
+
+ for (y = 0; y < fft_len; y++) {
+ for (x = 0; x < fft_len; x++) {
+ FFTSample re, im, ire, iim;
+
+ re = s->fft_vdata[plane][y*fft_len + x].re;
+ im = s->fft_vdata[plane][y*fft_len + x].im;
+ ire = s->fft_vdata_impulse[plane][y*fft_len + x].re;
+ iim = s->fft_vdata_impulse[plane][y*fft_len + x].im;
+
+ s->fft_vdata[plane][y*fft_len + x].re = ire * re - iim * im;
+ s->fft_vdata[plane][y*fft_len + x].im = iim * re + ire * im;
+ }
+ }
+
+ ifft_vertical(s, fft_len, n, plane);
+ ifft_horizontal(s, mainpic, fft_len, w, h, n, plane);
+ }
+
+ return ff_filter_frame(outlink, mainpic);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ ConvolveContext *s = ctx->priv;
+ AVFilterLink *mainlink = ctx->inputs[0];
+ int ret, i;
+
+ s->fs.on_event = do_convolve;
+ ret = ff_framesync2_init_dualinput(&s->fs, ctx);
+ if (ret < 0)
+ return ret;
+ outlink->w = mainlink->w;
+ outlink->h = mainlink->h;
+ outlink->time_base = mainlink->time_base;
+ outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
+ outlink->frame_rate = mainlink->frame_rate;
+
+ if ((ret = ff_framesync2_configure(&s->fs)) < 0)
+ return ret;
+
+ for (i = 0; i < 4; i++) {
+ s->fft[i] = av_fft_init(s->fft_bits[i], 0);
+ s->ifft[i] = av_fft_init(s->fft_bits[i], 1);
+ }
+
+ return 0;
+}
+
+static int activate(AVFilterContext *ctx)
+{
+ ConvolveContext *s = ctx->priv;
+ return ff_framesync2_activate(&s->fs);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ ConvolveContext *s = ctx->priv;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ av_freep(&s->fft_hdata[i]);
+ av_freep(&s->fft_vdata[i]);
+ av_freep(&s->fft_hdata_impulse[i]);
+ av_freep(&s->fft_vdata_impulse[i]);
+ av_fft_end(s->fft[i]);
+ av_fft_end(s->ifft[i]);
+ }
+
+ ff_framesync2_uninit(&s->fs);
+}
+
+static const AVFilterPad convolve_inputs[] = {
+ {
+ .name = "main",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input_main,
+ },{
+ .name = "impulse",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input_impulse,
+ },
+ { NULL }
+};
+
+static const AVFilterPad convolve_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_convolve = {
+ .name = "convolve",
+ .description = NULL_IF_CONFIG_SMALL("Convolve first video stream with second video stream."),
+ .preinit = convolve_framesync_preinit,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .activate = activate,
+ .priv_size = sizeof(ConvolveContext),
+ .priv_class = &convolve_class,
+ .inputs = convolve_inputs,
+ .outputs = convolve_outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
+};
--
2.9.3
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