[FFmpeg-devel] avfilter: add fftdnoiz filter

Submitted by Paul B Mahol on May 8, 2018, 11:08 a.m.

Details

Message ID 20180508110832.22270-1-onemda@gmail.com
State New
Headers show

Commit Message

Paul B Mahol May 8, 2018, 11:08 a.m.
Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 configure                 |   2 +
 doc/filters.texi          |  32 +++
 libavfilter/Makefile      |   1 +
 libavfilter/allfilters.c  |   1 +
 libavfilter/vf_fftdnoiz.c | 691 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 727 insertions(+)
 create mode 100644 libavfilter/vf_fftdnoiz.c

Patch hide | download patch | download mbox

diff --git a/configure b/configure
index 7c143238a8..093d854ef1 100755
--- a/configure
+++ b/configure
@@ -3325,6 +3325,8 @@  elbg_filter_deps="avcodec"
 eq_filter_deps="gpl"
 fftfilt_filter_deps="avcodec"
 fftfilt_filter_select="rdft"
+fftdnoiz_filter_deps="avcodec"
+fftdnoiz_filter_select="fft"
 find_rect_filter_deps="avcodec avformat gpl"
 firequalizer_filter_deps="avcodec"
 firequalizer_filter_select="rdft"
diff --git a/doc/filters.texi b/doc/filters.texi
index 33e27e10f3..8f48971e57 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8696,6 +8696,38 @@  fftfilt=dc_Y=0:weight_Y='exp(-4 * ((Y+X)/(W+H)))'
 
 @end itemize
 
+@section fftdnoiz
+Denoise frames using 3D FFT (frequency domain filtering).
+
+The filter accepts the following options:
+
+@table @option
+@item sigma
+Set the noise sigma constant. This sets denoising strength.
+Default value is 1. Allowed range is from 0 to 7.
+
+@item amount
+Set amount of denoising. By default all detected noise is removed.
+Default value is 1. Allowed range is from 0 to 1.
+
+@item block
+Set size of block, Default is 4, can be 4, 5 or 6.
+Actual size of block in pixels is 2 to power of @var{block}, so by default
+block size in pixels is 2^4 which is 16.
+
+@item overlap
+Set block overlap. Default is 0.5. Allowed range is from 0.2 to 0.8.
+
+@item prev
+Set number of previous frames to use for denoising. By default is set to 0.
+
+@item next
+Set number of next frames to to use for denoising. By default is set to 0.
+
+@item planes
+Set planes which will be filtered, by default are all available except alpha.
+@end table
+
 @section field
 
 Extract a single field from an interlaced image using stride
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index a416fa1fae..92f526a275 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -201,6 +201,7 @@  OBJS-$(CONFIG_EQ_FILTER)                     += vf_eq.o
 OBJS-$(CONFIG_EROSION_FILTER)                += vf_neighbor.o
 OBJS-$(CONFIG_EXTRACTPLANES_FILTER)          += vf_extractplanes.o
 OBJS-$(CONFIG_FADE_FILTER)                   += vf_fade.o
+OBJS-$(CONFIG_FFTDNOIZ_FILTER)               += vf_fftdnoiz.o
 OBJS-$(CONFIG_FFTFILT_FILTER)                += vf_fftfilt.o
 OBJS-$(CONFIG_FIELD_FILTER)                  += vf_field.o
 OBJS-$(CONFIG_FIELDHINT_FILTER)              += vf_fieldhint.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 42f956b3bf..f3a76c4652 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -193,6 +193,7 @@  extern AVFilter ff_vf_eq;
 extern AVFilter ff_vf_erosion;
 extern AVFilter ff_vf_extractplanes;
 extern AVFilter ff_vf_fade;
+extern AVFilter ff_vf_fftdnoiz;
 extern AVFilter ff_vf_fftfilt;
 extern AVFilter ff_vf_field;
 extern AVFilter ff_vf_fieldhint;
diff --git a/libavfilter/vf_fftdnoiz.c b/libavfilter/vf_fftdnoiz.c
new file mode 100644
index 0000000000..272a37cd40
--- /dev/null
+++ b/libavfilter/vf_fftdnoiz.c
@@ -0,0 +1,691 @@ 
+/*
+ * 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 <float.h>
+
+#include "libavutil/avassert.h"
+#include "libavutil/common.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "internal.h"
+#include "libavcodec/avfft.h"
+
+enum BufferTypes {
+    CURRENT,
+    PREV,
+    NEXT,
+    BSIZE
+};
+
+typedef struct PlaneContext {
+    int planewidth, planeheight;
+    int nox, noy;
+    int b;
+    int o;
+    float n;
+
+    float *buffer[BSIZE];
+    FFTComplex *hdata, *vdata;
+    int data_linesize;
+    int buffer_linesize;
+
+    FFTContext *fft, *ifft;
+} PlaneContext;
+
+typedef struct FFTdnoizContext {
+    const AVClass *class;
+
+    float sigma;
+    float amount;
+    int   block_bits;
+    float overlap;
+    int   nb_prev;
+    int   nb_next;
+    int   planesf;
+
+    AVFrame *prev, *cur, *next;
+
+    int depth;
+    int nb_planes;
+    PlaneContext planes[4];
+
+    void (*import_row)(FFTComplex *dst, uint8_t *src, int rw);
+    void (*export_row)(FFTComplex *src, uint8_t *dst, int rw, float scale, int depth);
+} FFTdnoizContext;
+
+#define OFFSET(x) offsetof(FFTdnoizContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption fftdnoiz_options[] = {
+    { "sigma",   "set noise sigma",
+        OFFSET(sigma),      AV_OPT_TYPE_FLOAT, {.dbl=1},        0,   7, .flags = FLAGS },
+    { "amount",  "set amount of denoising",
+        OFFSET(amount),     AV_OPT_TYPE_FLOAT, {.dbl=1},     0.01,   1, .flags = FLAGS },
+    { "block",   "set block log2(size)",
+        OFFSET(block_bits), AV_OPT_TYPE_INT,   {.i64=4},        4,   6, .flags = FLAGS },
+    { "overlap", "set block overlap",
+        OFFSET(overlap),    AV_OPT_TYPE_FLOAT, {.dbl=0.5},    0.2, 0.8, .flags = FLAGS },
+    { "prev",    "set number of previous frames for temporal denoising",
+        OFFSET(nb_prev),    AV_OPT_TYPE_INT,   {.i64=0},        0,   1, .flags = FLAGS },
+    { "next",    "set number of next frames for temporal denoising",
+        OFFSET(nb_next),    AV_OPT_TYPE_INT,   {.i64=0},        0,   1, .flags = FLAGS },
+    { "planes",  "set planes to filter",
+        OFFSET(planesf),    AV_OPT_TYPE_INT,   {.i64=7},        0,  15, .flags = FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(fftdnoiz);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    FFTdnoizContext *s = ctx->priv;
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        PlaneContext *p = &s->planes[i];
+
+        p->fft  = av_fft_init(s->block_bits, 0);
+        p->ifft = av_fft_init(s->block_bits, 1);
+        if (!p->fft || !p->ifft)
+            return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        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_YUV410P, AV_PIX_FMT_YUV411P,
+        AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
+        AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
+        AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
+        AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
+        AV_PIX_FMT_YUVJ411P,
+        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_YUV440P10,
+        AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
+        AV_PIX_FMT_YUV440P12,
+        AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
+        AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
+        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_NONE
+    };
+    AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+    if (!fmts_list)
+        return AVERROR(ENOMEM);
+    return ff_set_common_formats(ctx, fmts_list);
+}
+
+typedef struct ThreadData {
+    float *src, *dst;
+} ThreadData;
+
+static void import_row8(FFTComplex *dst, uint8_t *src, int rw)
+{
+    int j;
+
+    for (j = 0; j < rw; j++) {
+        dst[j].re = src[j];
+        dst[j].im = 0;
+    }
+}
+
+static void export_row8(FFTComplex *src, uint8_t *dst, int rw, float scale, int depth)
+{
+    int j;
+
+    for (j = 0; j < rw; j++)
+        dst[j] = av_clip_uint8(src[j].re * scale);
+}
+
+static void import_row16(FFTComplex *dst, uint8_t *srcp, int rw)
+{
+    uint16_t *src = (uint16_t *)srcp;
+    int j;
+
+    for (j = 0; j < rw; j++) {
+        dst[j].re = src[j];
+        dst[j].im = 0;
+    }
+}
+
+static void export_row16(FFTComplex *src, uint8_t *dstp, int rw, float scale, int depth)
+{
+    uint16_t *dst = (uint16_t *)dstp;
+    int j;
+
+    for (j = 0; j < rw; j++)
+        dst[j] = av_clip_uintp2(src[j].re * scale, depth);
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    const AVPixFmtDescriptor *desc;
+    FFTdnoizContext *s = ctx->priv;
+    int i;
+
+    desc = av_pix_fmt_desc_get(inlink->format);
+    s->depth = desc->comp[0].depth;
+
+    if (s->depth <= 8) {
+        s->import_row = import_row8;
+        s->export_row = export_row8;
+    } else {
+        s->import_row = import_row16;
+        s->export_row = export_row16;
+        s->sigma *= 1 << (s->depth - 8);
+    }
+
+    s->planes[1].planewidth = s->planes[2].planewidth = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+    s->planes[0].planewidth = s->planes[3].planewidth = inlink->w;
+    s->planes[1].planeheight = s->planes[2].planeheight = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+    s->planes[0].planeheight = s->planes[3].planeheight = inlink->h;
+
+    s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+    for (i = 0; i < s->nb_planes; i++) {
+        PlaneContext *p = &s->planes[i];
+        int size;
+
+        p->b = 1 << s->block_bits;
+        p->n = 1.f / (p->b * p->b);
+        p->o = p->b * s->overlap;
+        size = p->b - p->o;
+        p->nox = (p->planewidth  + (size - 1)) / size;
+        p->noy = (p->planeheight + (size - 1)) / size;
+
+        av_log(ctx, AV_LOG_DEBUG, "nox:%d noy:%d size:%d\n", p->nox, p->noy, size);
+
+        p->buffer_linesize = p->b * p->nox * sizeof(FFTComplex);
+        p->buffer[CURRENT] = av_calloc(p->b * p->noy, p->buffer_linesize);
+        if (!p->buffer[CURRENT])
+            return AVERROR(ENOMEM);
+        if (s->nb_prev > 0) {
+            p->buffer[PREV] = av_calloc(p->b * p->noy, p->buffer_linesize);
+            if (!p->buffer[PREV])
+                return AVERROR(ENOMEM);
+        }
+        if (s->nb_next > 0) {
+            p->buffer[NEXT] = av_calloc(p->b * p->noy, p->buffer_linesize);
+            if (!p->buffer[NEXT])
+                return AVERROR(ENOMEM);
+        }
+        p->data_linesize = 2 * p->b * sizeof(float);
+        p->hdata = av_calloc(p->b, p->data_linesize);
+        p->vdata = av_calloc(p->b, p->data_linesize);
+        if (!p->hdata || !p->vdata)
+            return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static void import_plane(FFTdnoizContext *s,
+                         uint8_t *srcp, int src_linesize,
+                         float *buffer, int buffer_linesize, int plane)
+{
+    PlaneContext *p = &s->planes[plane];
+    const int width = p->planewidth;
+    const int height = p->planeheight;
+    const int block = p->b;
+    const int overlap = p->o;
+    const int size = block - overlap;
+    const int nox = p->nox;
+    const int noy = p->noy;
+    const int bpp = (s->depth + 7) / 8;
+    const int data_linesize = p->data_linesize / sizeof(FFTComplex);
+    FFTComplex *hdata = p->hdata;
+    FFTComplex *vdata = p->vdata;
+    int x, y, i, j;
+
+    buffer_linesize /= sizeof(float);
+    for (y = 0; y < noy; y++) {
+        for (x = 0; x < nox; x++) {
+            const int rh = FFMIN(block, height - y * size);
+            const int rw = FFMIN(block, width  - x * size);
+            uint8_t *src = srcp + src_linesize * y * size + x * size * bpp;
+            float *bdst = buffer + buffer_linesize * y * block + x * block * 2;
+            FFTComplex *ssrc, *dst = hdata;
+
+            for (i = 0; i < rh; i++) {
+                s->import_row(dst, src, rw);
+                for (; j < block; j++) {
+                    dst[j].re = dst[block - j - 1].re;
+                    dst[j].im = 0;
+                }
+                av_fft_permute(p->fft, dst);
+                av_fft_calc(p->fft, dst);
+
+                src += src_linesize;
+                dst += data_linesize;
+            }
+
+            dst = hdata;
+            for (; i < block; i++) {
+                for (j = 0; j < block; j++) {
+                    dst[j].re = dst[(block - i - 1) * data_linesize + j].re;
+                    dst[j].im = dst[(block - i - 1) * data_linesize + j].im;
+                }
+            }
+
+            ssrc = hdata;
+            dst = vdata;
+            for (i = 0; i < block; i++) {
+                for (j = 0; j < block; j++)
+                    dst[j] = ssrc[j * data_linesize + i];
+                av_fft_permute(p->fft, dst);
+                av_fft_calc(p->fft, dst);
+                memcpy(bdst, dst, block * sizeof(FFTComplex));
+
+                dst += data_linesize;
+                bdst += buffer_linesize;
+            }
+        }
+    }
+}
+
+static void export_plane(FFTdnoizContext *s,
+                         uint8_t *dstp, int dst_linesize,
+                         float *buffer, int buffer_linesize, int plane)
+{
+    PlaneContext *p = &s->planes[plane];
+    const int depth = s->depth;
+    const int bpp = (depth + 7) / 8;
+    const int width = p->planewidth;
+    const int height = p->planeheight;
+    const int block = p->b;
+    const int overlap = p->o;
+    const int hoverlap = overlap / 2;
+    const int size = block - overlap;
+    const int nox = p->nox;
+    const int noy = p->noy;
+    const int data_linesize = p->data_linesize / sizeof(FFTComplex);
+    const float scale = 1.f / (block * block);
+    FFTComplex *hdata = p->hdata;
+    FFTComplex *vdata = p->vdata;
+    int x, y, i, j;
+
+    buffer_linesize /= sizeof(float);
+    for (y = 0; y < noy; y++) {
+        for (x = 0; x < nox; x++) {
+            const int woff = x == 0 ? 0 : hoverlap;
+            const int hoff = y == 0 ? 0 : hoverlap;
+            const int rw = x == 0 ? block : FFMIN(size, width  - x * size - woff);
+            const int rh = y == 0 ? block : FFMIN(size, height - y * size - hoff);
+            float *bsrc = buffer + buffer_linesize * y * block + x * block * 2;
+            uint8_t *dst = dstp + dst_linesize * (y * size + hoff) + (x * size + woff) * bpp;
+            FFTComplex *hdst, *ddst = vdata;
+
+            hdst = hdata;
+            for (i = 0; i < block; i++) {
+                memcpy(ddst, bsrc, block * sizeof(FFTComplex));
+                av_fft_permute(p->ifft, ddst);
+                av_fft_calc(p->ifft, ddst);
+                for (j = 0; j < block; j++) {
+                    hdst[j * data_linesize + i] = ddst[j];
+                }
+
+                ddst += data_linesize;
+                bsrc += buffer_linesize;
+            }
+
+            hdst = hdata + hoff * data_linesize;
+            for (i = 0; i < rh; i++) {
+                av_fft_permute(p->ifft, hdst);
+                av_fft_calc(p->ifft, hdst);
+                s->export_row(hdst + woff, dst, rw, scale, depth);
+
+                hdst += data_linesize;
+                dst += dst_linesize;
+            }
+        }
+    }
+}
+
+static void filter_plane3d2(FFTdnoizContext *s, int plane, float *pbuffer, float *nbuffer)
+{
+    PlaneContext *p = &s->planes[plane];
+    const int block = p->b;
+    const int nox = p->nox;
+    const int noy = p->noy;
+    const int buffer_linesize = p->buffer_linesize / sizeof(float);
+    const float sigma = s->sigma * s->sigma * block * block;
+    const float limit = 1.f - s->amount;
+    float *cbuffer = p->buffer[CURRENT];
+    const float cfactor = sqrtf(3.f) * 0.5f;
+    const float scale = 1.f / 3.f;
+    int y, x, i, j;
+
+    for (y = 0; y < noy; y++) {
+        for (x = 0; x < nox; x++) {
+            float *cbuff = cbuffer + buffer_linesize * y * block + x * block * 2;
+            float *pbuff = pbuffer + buffer_linesize * y * block + x * block * 2;
+            float *nbuff = nbuffer + buffer_linesize * y * block + x * block * 2;
+
+            for (i = 0; i < block; i++) {
+                for (j = 0; j < block; j++) {
+                    float sumr, sumi, difr, difi, mpr, mpi, mnr, mni;
+                    float factor, power, sumpnr, sumpni;
+
+                    sumpnr = pbuff[2 * j    ] + nbuff[2 * j    ];
+                    sumpni = pbuff[2 * j + 1] + nbuff[2 * j + 1];
+                    sumr = cbuff[2 * j    ] + sumpnr;
+                    sumi = cbuff[2 * j + 1] + sumpni;
+                    difr = cfactor * (nbuff[2 * j    ] - pbuff[2 * j    ]);
+                    difi = cfactor * (pbuff[2 * j + 1] - nbuff[2 * j + 1]);
+                    mpr = cbuff[2 * j    ] - 0.5f * sumpnr + difi;
+                    mnr = mpr - difi - difi;
+                    mpi = cbuff[2 * j + 1] - 0.5f * sumpni + difr;
+                    mni = mpi - difr - difr;
+                    power = sumr * sumr + sumi * sumi + 1e-15f;
+                    factor = FFMAX((power - sigma) / power, limit);
+                    sumr *= factor;
+                    sumi *= factor;
+                    power = mpr * mpr + mpi * mpi + 1e-15f;
+                    factor = FFMAX((power - sigma) / power, limit);
+                    mpr *= factor;
+                    mpi *= factor;
+                    power = mnr * mnr + mni * mni + 1e-15f;
+                    factor = FFMAX((power - sigma) / power, limit);
+                    mnr *= factor;
+                    mni *= factor;
+                    cbuff[2 * j    ] = (sumr + mpr + mnr) * scale;
+                    cbuff[2 * j + 1] = (sumi + mpi + mni) * scale;
+
+                }
+
+                cbuff += buffer_linesize;
+                pbuff += buffer_linesize;
+                nbuff += buffer_linesize;
+            }
+        }
+    }
+}
+
+static void filter_plane3d1(FFTdnoizContext *s, int plane, float *pbuffer)
+{
+    PlaneContext *p = &s->planes[plane];
+    const int block = p->b;
+    const int nox = p->nox;
+    const int noy = p->noy;
+    const int buffer_linesize = p->buffer_linesize / sizeof(float);
+    const float sigma = s->sigma * s->sigma * block * block;
+    const float limit = 1.f - s->amount;
+    float *cbuffer = p->buffer[CURRENT];
+    int y, x, i, j;
+
+    for (y = 0; y < noy; y++) {
+        for (x = 0; x < nox; x++) {
+            float *cbuff = cbuffer + buffer_linesize * y * block + x * block * 2;
+            float *pbuff = pbuffer + buffer_linesize * y * block + x * block * 2;
+
+            for (i = 0; i < block; i++) {
+                for (j = 0; j < block; j++) {
+                    float factor, power, re, im, pre, pim;
+                    float sumr, sumi, difr, difi;
+
+                    re = cbuff[j * 2    ];
+                    pre = pbuff[j * 2    ];
+                    im = cbuff[j * 2 + 1];
+                    pim = pbuff[j * 2 + 1];
+
+                    sumr = re + pre;
+                    sumi = im + pim;
+                    difr = re - pre;
+                    difi = im - pim;
+
+                    power = sumr * sumr + sumi * sumi + 1e-15f;
+                    factor = FFMAX(limit, (power - sigma) / power);
+                    sumr *= factor;
+                    sumi *= factor;
+                    power = difr * difr + difi * difi + 1e-15f;
+                    factor = FFMAX(limit, (power - sigma) / power);
+                    difr *= factor;
+                    difi *= factor;
+
+                    cbuff[j * 2    ] = (sumr + difr) * 0.5f;
+                    cbuff[j * 2 + 1] = (sumi + difi) * 0.5f;
+                }
+
+                cbuff += buffer_linesize;
+                pbuff += buffer_linesize;
+            }
+        }
+    }
+}
+
+static void filter_plane2d(FFTdnoizContext *s, int plane)
+{
+    PlaneContext *p = &s->planes[plane];
+    const int block = p->b;
+    const int nox = p->nox;
+    const int noy = p->noy;
+    const int buffer_linesize = p->buffer_linesize / 4;
+    const float sigma = s->sigma * s->sigma * block * block;
+    const float limit = 1.f - s->amount;
+    float *buffer = p->buffer[CURRENT];
+    int y, x, i, j;
+
+    for (y = 0; y < noy; y++) {
+        for (x = 0; x < nox; x++) {
+            float *buff = buffer + buffer_linesize * y * block + x * block * 2;
+
+            for (i = 0; i < block; i++) {
+                for (j = 0; j < block; j++) {
+                    float factor, power, re, im;
+
+                    re = buff[j * 2    ];
+                    im = buff[j * 2 + 1];
+                    power = re * re + im * im + 1e-15f;
+                    factor = FFMAX(limit, (power - sigma) / power);
+                    buff[j * 2    ] *= factor;
+                    buff[j * 2 + 1] *= factor;
+                }
+
+                buff += buffer_linesize;
+            }
+        }
+    }
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    FFTdnoizContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    int direct, plane;
+    AVFrame *out;
+
+    if (s->nb_next > 0 && s->nb_prev > 0) {
+        av_frame_free(&s->prev);
+        s->prev = s->cur;
+        s->cur = s->next;
+        s->next = in;
+
+        if (!s->cur || !s->prev)
+            return 0;
+    } else if (s->nb_next > 0) {
+        av_frame_free(&s->cur);
+        s->cur = s->next;
+        s->next = in;
+
+        if (!s->cur)
+            return 0;
+    } else if (s->nb_prev > 0) {
+        av_frame_free(&s->prev);
+        s->prev = s->cur;
+        s->cur = in;
+
+        if (!s->prev)
+            return 0;
+    } else {
+        s->cur = in;
+    }
+
+    if (av_frame_is_writable(in) && s->nb_next == 0 && s->nb_prev == 0) {
+        direct = 1;
+        out = in;
+    } else {
+        direct = 0;
+        out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+        if (!out)
+            return AVERROR(ENOMEM);
+        av_frame_copy_props(out, s->prev ? s->prev : s->cur);
+    }
+
+    for (plane = 0; plane < s->nb_planes; plane++) {
+        PlaneContext *p = &s->planes[plane];
+
+        if (!((1 << plane) & s->planesf) || ctx->is_disabled) {
+            if (!direct)
+                av_image_copy_plane(out->data[plane], out->linesize[plane],
+                                    s->cur->data[plane], s->cur->linesize[plane],
+                                    p->planewidth, p->planeheight);
+            continue;
+        }
+
+        if (s->next) {
+            import_plane(s, s->next->data[plane], s->next->linesize[plane],
+                         p->buffer[NEXT], p->buffer_linesize, plane);
+        }
+
+        if (s->prev) {
+            import_plane(s, s->prev->data[plane], s->prev->linesize[plane],
+                         p->buffer[PREV], p->buffer_linesize, plane);
+        }
+
+        import_plane(s, s->cur->data[plane], s->cur->linesize[plane],
+                     p->buffer[CURRENT], p->buffer_linesize, plane);
+
+        if (s->next && s->prev) {
+            filter_plane3d2(s, plane, p->buffer[PREV], p->buffer[NEXT]);
+        } else if (s->next) {
+            filter_plane3d1(s, plane, p->buffer[NEXT]);
+        } else  if (s->prev) {
+            filter_plane3d1(s, plane, p->buffer[PREV]);
+        } else {
+            filter_plane2d(s, plane);
+        }
+
+        export_plane(s, out->data[plane], out->linesize[plane],
+                     p->buffer[CURRENT], p->buffer_linesize, plane);
+    }
+
+    if (s->nb_next == 0 && s->nb_prev == 0) {
+        if (direct) {
+            s->cur = NULL;
+        } else {
+            av_frame_free(&s->cur);
+        }
+    }
+    return ff_filter_frame(outlink, out);
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    FFTdnoizContext *s = ctx->priv;
+    int ret = 0;
+
+    ret = ff_request_frame(ctx->inputs[0]);
+
+    if (ret == AVERROR_EOF && (s->nb_next > 0 || s->nb_prev > 0)) {
+        int repeat = s->nb_next + s->nb_prev;
+        AVFrame *buf;
+
+        while (repeat) {
+            if (s->next && s->nb_next > 0)
+                buf = av_frame_clone(s->next);
+            else if (s->cur)
+                buf = av_frame_clone(s->cur);
+            else
+                buf = av_frame_clone(s->prev);
+            if (!buf)
+                return AVERROR(ENOMEM);
+
+            ret = filter_frame(ctx->inputs[0], buf);
+            if (ret < 0)
+                return ret;
+            repeat--;
+        }
+        ret = AVERROR_EOF;
+    }
+
+    return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    FFTdnoizContext *s = ctx->priv;
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        PlaneContext *p = &s->planes[i];
+
+        av_freep(&p->hdata);
+        av_freep(&p->vdata);
+        av_freep(&p->buffer[PREV]);
+        av_freep(&p->buffer[CURRENT]);
+        av_freep(&p->buffer[NEXT]);
+        av_fft_end(p->fft);
+        av_fft_end(p->ifft);
+    }
+
+    av_frame_free(&s->prev);
+    av_frame_free(&s->cur);
+    av_frame_free(&s->next);
+}
+
+static const AVFilterPad fftdnoiz_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+        .config_props = config_input,
+    },
+    { NULL }
+};
+
+static const AVFilterPad fftdnoiz_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .request_frame = request_frame,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_fftdnoiz = {
+    .name          = "fftdnoiz",
+    .description   = NULL_IF_CONFIG_SMALL("Denoise frames using 3D FFT."),
+    .priv_size     = sizeof(FFTdnoizContext),
+    .init          = init,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = fftdnoiz_inputs,
+    .outputs       = fftdnoiz_outputs,
+    .priv_class    = &fftdnoiz_class,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
+};