[FFmpeg-devel] [PATCH] avfilter: add fftdnoiz filter

Paul B Mahol onemda at gmail.com
Mon May 7 16:59:29 EEST 2018


Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavfilter/Makefile      |   1 +
 libavfilter/allfilters.c  |   1 +
 libavfilter/vf_fftdnoiz.c | 393 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 395 insertions(+)
 create mode 100644 libavfilter/vf_fftdnoiz.c

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..eac3f2642a
--- /dev/null
+++ b/libavfilter/vf_fftdnoiz.c
@@ -0,0 +1,393 @@
+/*
+ * 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"
+
+typedef struct PlaneContext {
+    int planewidth, planeheight;
+    int nox, noy;
+    int b;
+    int o;
+    float n;
+
+    float *buffer;
+    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   planesf;
+
+    int nb_planes;
+    PlaneContext planes[4];
+} 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=2},        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=5},        4,   6, .flags = FLAGS },
+    { "overlap", "set block overlap",        OFFSET(overlap),    AV_OPT_TYPE_FLOAT, {.dbl=0.3333}, 0.2, 0.8, .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 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->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 = 2 * p->b * p->nox * sizeof(float);
+        p->buffer = av_calloc(p->nox * p->noy, 2 * p->b * p->b * sizeof(float));
+        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->buffer || !p->hdata || !p->vdata)
+            return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+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_YUV420P,
+        AV_PIX_FMT_YUV422P,
+        AV_PIX_FMT_YUV444P,
+        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_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 data_linesize = p->data_linesize / sizeof(FFTComplex);
+    FFTComplex *hdata = p->hdata;
+    FFTComplex *vdata = p->vdata;
+    int x, y, i, j;
+
+    buffer_linesize /= 4;
+    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;
+            float *bdst = buffer + buffer_linesize * y * block + x * block * 2;
+            FFTComplex *ssrc, *dst = hdata;
+
+            for (i = 0; i < rh; i++) {
+                for (j = 0; j < rw; j++) {
+                    dst[j].re = src[j];
+                    dst[j].im = 0;
+                }
+                for (; j < block; j++) {
+                    dst[j].re = src[block - j - 1];
+                    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 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 /= 4;
+    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;
+            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);
+                for (j = 0; j < rw; j++)
+                    dst[j] = av_clip_uint8(hdst[j + woff].re * scale);
+
+                hdst += data_linesize;
+                dst += dst_linesize;
+            }
+        }
+    }
+}
+
+static void filter_plane(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;
+    float *buffer = p->buffer;
+    const float sigma = s->sigma * s->sigma * block * block;
+    const float limit = 1.f - s->amount;
+    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 (av_frame_is_writable(in)) {
+        direct = 1;
+        out = in;
+    } else {
+        direct = 0;
+        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 (plane = 0; plane < s->nb_planes; plane++) {
+        PlaneContext *p = &s->planes[plane];
+
+        if (!((1 << plane) & s->planesf)) {
+            av_image_copy_plane(out->data[plane], out->linesize[plane],
+                                in->data[plane], in->linesize[plane],
+                                p->planewidth, p->planeheight);
+            continue;
+        }
+
+        import_plane(s, in->data[plane], in->linesize[plane],
+                     p->buffer, p->buffer_linesize, plane);
+
+        filter_plane(s, plane);
+
+        export_plane(s, out->data[plane], out->linesize[plane],
+                     p->buffer, p->buffer_linesize, plane);
+    }
+
+    if (!direct)
+        av_frame_free(&in);
+    return ff_filter_frame(outlink, out);
+}
+
+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);
+        av_fft_end(p->fft);
+        av_fft_end(p->ifft);
+    }
+}
+
+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,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_fftdnoiz = {
+    .name          = "fftdnoiz",
+    .description   = NULL_IF_CONFIG_SMALL("Denoise frames using 2D 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_GENERIC,
+};
-- 
2.11.0



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