diff --git a/doc/filters.texi b/doc/filters.texi
index a0b4ab2228..15a8636398 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1314,6 +1314,47 @@ Force the output to either unsigned 8-bit or signed 16-bit stereo
 aformat=sample_fmts=u8|s16:channel_layouts=stereo
 @end example
 
+@section afwtdn
+Reduce broadband noise from input samples using Fast Wavelet Transform.
+
+A description of the accepted options follows.
+
+@table @option
+@item sigma
+Set the noise sigma, allowed range is from 0 to 100.
+Default value is 0.
+This option controls strength of denoising applied to input samples.
+
+@item levels
+Set the number of wavelet levels of decomposition.
+Allowed range is from 1 to 19.
+Default value is 10.
+Setting this too low make denoising performance very poor.
+
+@item wavet
+Set wavelet type for decomposition of input frame.
+Available wavelets are:
+
+@table @samp
+@item deb4
+@item deb10
+@item coif5
+@item rbior68
+@end table
+
+@item percent
+Set percent of full denoising. Allowed range is from 0 to 100 percent.
+Default value is 85 percent or partial denoising.
+
+@item profile
+If set enabled, first input frame will be used as noise profile.
+If first frame samples contain non-noise performance will be very poor.
+
+@item frames
+Set size of single frame in number of samples. Allowed range is from 1024 to
+262144. Default frame size is 8192 samples.
+@end table
+
 @section agate
 
 A gate is mainly used to reduce lower parts of a signal. This kind of signal
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 5123540653..191826a622 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -50,6 +50,7 @@ OBJS-$(CONFIG_AFFTDN_FILTER)                 += af_afftdn.o
 OBJS-$(CONFIG_AFFTFILT_FILTER)               += af_afftfilt.o
 OBJS-$(CONFIG_AFIR_FILTER)                   += af_afir.o
 OBJS-$(CONFIG_AFORMAT_FILTER)                += af_aformat.o
+OBJS-$(CONFIG_AFWTDN_FILTER)                 += af_afwtdn.o
 OBJS-$(CONFIG_AGATE_FILTER)                  += af_agate.o
 OBJS-$(CONFIG_AIIR_FILTER)                   += af_aiir.o
 OBJS-$(CONFIG_AINTEGRAL_FILTER)              += af_aderivative.o
diff --git a/libavfilter/af_afwtdn.c b/libavfilter/af_afwtdn.c
new file mode 100644
index 0000000000..2d51c7bf2d
--- /dev/null
+++ b/libavfilter/af_afwtdn.c
@@ -0,0 +1,653 @@
+/*
+ * Copyright (c) 2020 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 <float.h>
+
+#include "libavutil/avassert.h"
+#include "libavutil/audio_fifo.h"
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "audio.h"
+#include "filters.h"
+#include "formats.h"
+
+static const double rbior68_lp[18] = {
+    0.0, 0.0, 0.0, 0.0,
+    0.014426282505624435, 0.014467504896790148,
+    -0.07872200106262882, -0.04036797903033992,
+    0.41784910915027457, 0.7589077294536541,
+    0.41784910915027457, -0.04036797903033992,
+    -0.07872200106262882, 0.014467504896790148,
+    0.014426282505624435, 0.0, 0.0, 0.0,
+};
+
+static const double rbior68_hp[18] = {
+    -0.0019088317364812906, -0.0019142861290887667,
+    0.016990639867602342, 0.01193456527972926,
+    -0.04973290349094079, -0.07726317316720414,
+    0.09405920349573646, 0.4207962846098268,
+    -0.8259229974584023, 0.4207962846098268,
+    0.09405920349573646, -0.07726317316720414,
+    -0.04973290349094079, 0.01193456527972926,
+    0.016990639867602342, -0.0019142861290887667,
+    -0.0019088317364812906, 0.0,
+};
+
+static const double rbior68_ilp[18] = {
+    0.0019088317364812906, -0.0019142861290887667,
+    -0.016990639867602342, 0.01193456527972926,
+    0.04973290349094079, -0.07726317316720414,
+    -0.09405920349573646, 0.4207962846098268,
+    0.8259229974584023, 0.4207962846098268,
+    -0.09405920349573646, -0.07726317316720414,
+    0.04973290349094079, 0.01193456527972926,
+    -0.016990639867602342, -0.0019142861290887667,
+    0.0019088317364812906, 0.0,
+};
+
+static const double rbior68_ihp[18] = {
+    0.0, 0.0, 0.0, 0.0,
+    0.014426282505624435, -0.014467504896790148,
+    -0.07872200106262882, 0.04036797903033992,
+    0.41784910915027457, -0.7589077294536541,
+    0.41784910915027457, 0.04036797903033992,
+    -0.07872200106262882, -0.014467504896790148,
+    0.014426282505624435, 0.0, 0.0, 0.0,
+};
+
+static const double coif5_lp[30] = {
+    -9.517657273819165e-08, -1.6744288576823017e-07,
+    2.0637618513646814e-06, 3.7346551751414047e-06,
+    -2.1315026809955787e-05, -4.134043227251251e-05,
+    0.00014054114970203437, 0.00030225958181306315,
+    -0.0006381313430451114, -0.0016628637020130838,
+    0.0024333732126576722, 0.006764185448053083,
+    -0.009164231162481846, -0.01976177894257264,
+    0.03268357426711183, 0.0412892087501817,
+    -0.10557420870333893, -0.06203596396290357,
+    0.4379916261718371, 0.7742896036529562,
+    0.4215662066908515, -0.05204316317624377,
+    -0.09192001055969624, 0.02816802897093635,
+    0.023408156785839195, -0.010131117519849788,
+    -0.004159358781386048, 0.0021782363581090178,
+    0.00035858968789573785, -0.00021208083980379827,
+};
+
+static const double coif5_hp[30] = {
+    0.00021208083980379827, 0.00035858968789573785,
+    -0.0021782363581090178, -0.004159358781386048,
+    0.010131117519849788, 0.023408156785839195,
+    -0.02816802897093635, -0.09192001055969624,
+    0.05204316317624377, 0.4215662066908515,
+    -0.7742896036529562, 0.4379916261718371,
+    0.06203596396290357, -0.10557420870333893,
+    -0.0412892087501817, 0.03268357426711183,
+    0.01976177894257264, -0.009164231162481846,
+    -0.006764185448053083, 0.0024333732126576722,
+    0.0016628637020130838, -0.0006381313430451114,
+    -0.00030225958181306315, 0.00014054114970203437,
+    4.134043227251251e-05, -2.1315026809955787e-05,
+    -3.7346551751414047e-06, 2.0637618513646814e-06,
+    1.6744288576823017e-07, -9.517657273819165e-08,
+};
+
+static const double coif5_ilp[30] = {
+    -0.00021208083980379827, 0.00035858968789573785,
+    0.0021782363581090178, -0.004159358781386048,
+    -0.010131117519849788, 0.023408156785839195,
+    0.02816802897093635, -0.09192001055969624,
+    -0.05204316317624377, 0.4215662066908515,
+    0.7742896036529562, 0.4379916261718371,
+    -0.06203596396290357, -0.10557420870333893,
+    0.0412892087501817, 0.03268357426711183,
+    -0.01976177894257264, -0.009164231162481846,
+    0.006764185448053083, 0.0024333732126576722,
+    -0.0016628637020130838, -0.0006381313430451114,
+    0.00030225958181306315, 0.00014054114970203437,
+    -4.134043227251251e-05, -2.1315026809955787e-05,
+    3.7346551751414047e-06, 2.0637618513646814e-06,
+    -1.6744288576823017e-07, -9.517657273819165e-08,
+};
+
+static const double coif5_ihp[30] = {
+    -9.517657273819165e-08, 1.6744288576823017e-07,
+    2.0637618513646814e-06, -3.7346551751414047e-06,
+    -2.1315026809955787e-05, 4.134043227251251e-05,
+    0.00014054114970203437, -0.00030225958181306315,
+    -0.0006381313430451114, 0.0016628637020130838,
+    0.0024333732126576722, -0.006764185448053083,
+    -0.009164231162481846, 0.01976177894257264,
+    0.03268357426711183, -0.0412892087501817,
+    -0.10557420870333893, 0.06203596396290357,
+    0.4379916261718371, -0.7742896036529562,
+    0.4215662066908515, 0.05204316317624377,
+    -0.09192001055969624, -0.02816802897093635,
+    0.023408156785839195, 0.010131117519849788,
+    -0.004159358781386048, -0.0021782363581090178,
+    0.00035858968789573785, 0.00021208083980379827,
+};
+
+static const double deb10_lp[20] = {
+    -1.326420300235487e-05, 9.358867000108985e-05,
+    -0.0001164668549943862, -0.0006858566950046825,
+    0.00199240529499085, 0.0013953517469940798,
+    -0.010733175482979604, 0.0036065535669883944,
+    0.03321267405893324, -0.02945753682194567,
+    -0.07139414716586077, 0.09305736460380659,
+    0.12736934033574265, -0.19594627437659665,
+    -0.24984642432648865, 0.2811723436604265,
+    0.6884590394525921, 0.5272011889309198,
+    0.18817680007762133, 0.026670057900950818,
+};
+
+static const double deb10_hp[20] = {
+    -0.026670057900950818, 0.18817680007762133,
+    -0.5272011889309198, 0.6884590394525921,
+    -0.2811723436604265, -0.24984642432648865,
+    0.19594627437659665, 0.12736934033574265,
+    -0.09305736460380659, -0.07139414716586077,
+    0.02945753682194567, 0.03321267405893324,
+    -0.0036065535669883944, -0.010733175482979604,
+    -0.0013953517469940798, 0.00199240529499085,
+    0.0006858566950046825, -0.0001164668549943862,
+    -9.358867000108985e-05, -1.326420300235487e-05,
+};
+
+static const double deb10_ilp[20] = {
+    0.026670057900950818, 0.18817680007762133,
+    0.5272011889309198, 0.6884590394525921,
+    0.2811723436604265, -0.24984642432648865,
+    -0.19594627437659665, 0.12736934033574265,
+    0.09305736460380659, -0.07139414716586077,
+    -0.02945753682194567, 0.03321267405893324,
+    0.0036065535669883944, -0.010733175482979604,
+    0.0013953517469940798, 0.00199240529499085,
+    -0.0006858566950046825, -0.0001164668549943862,
+    9.358867000108985e-05, -1.326420300235487e-05,
+};
+
+static const double deb10_ihp[20] = {
+    -1.326420300235487e-05, -9.358867000108985e-05,
+    -0.0001164668549943862, 0.0006858566950046825,
+    0.00199240529499085, -0.0013953517469940798,
+    -0.010733175482979604, -0.0036065535669883944,
+    0.03321267405893324, 0.02945753682194567,
+    -0.07139414716586077, -0.09305736460380659,
+    0.12736934033574265, 0.19594627437659665,
+    -0.24984642432648865, -0.2811723436604265,
+    0.6884590394525921, -0.5272011889309198,
+    0.18817680007762133, -0.026670057900950818,
+};
+
+static const double deb4_lp[8] = {
+    -0.0105974018, 0.0328830117,
+     0.0308413818, -0.1870348117,
+    -0.0279837694, 0.6308807679,
+     0.7148465706, 0.2303778133,
+};
+
+static const double deb4_hp[8] = {
+    -0.2303778133, 0.7148465706,
+    -0.6308807679, -0.0279837694,
+     0.1870348117, 0.0308413818,
+    -0.0328830117, -0.0105974018,
+};
+
+static const double deb4_ilp[8] = {
+     0.23037781330885523, 0.7148465705525415,
+     0.6308807679295904, -0.02798376941698385,
+    -0.18703481171888114, 0.030841381835986965,
+     0.032883011666982945, -0.010597401784997278,
+};
+
+static const double deb4_ihp[8] = {
+    -0.010597401784997278, -0.032883011666982945,
+     0.030841381835986965, 0.18703481171888114,
+    -0.02798376941698385, -0.6308807679295904,
+     0.7148465705525415, -0.23037781330885523,
+};
+
+#define MAX_LEVELS 20
+
+typedef struct AudioFWTDNContext {
+    const AVClass *class;
+
+    double sigma;
+    double percent;
+
+    int wavelet_type;
+    int thresholding_function;
+    int nb_samples;
+    int levels;
+    int wavelet_length;
+    int length[MAX_LEVELS];
+    int out_length;
+    int need_profile;
+    int got_profile;
+
+    const double *lp, *hp;
+    const double *ilp, *ihp;
+
+    AVFrame *temp0, *temp1;
+    AVFrame *wtc, *power, *profile, *filter, *signal;
+} AudioFWTDNContext;
+
+#define OFFSET(x) offsetof(AudioFWTDNContext, x)
+#define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption afwtdn_options[] = {
+    { "sigma", "set noise sigma", OFFSET(sigma), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 100, AF },
+    { "levels", "set number of wavelet levels", OFFSET(levels), AV_OPT_TYPE_INT, {.i64=10}, 1, MAX_LEVELS-1, AF },
+    { "wavet", "set wavelet type", OFFSET(wavelet_type), AV_OPT_TYPE_INT, {.i64=0}, 0, 3, AF, "wavet" },
+    { "deb4",  "deb4", 0, AV_OPT_TYPE_CONST,  {.i64=0}, 0, 0, AF, "wavet" },
+    { "deb10", "deb10", 0, AV_OPT_TYPE_CONST,  {.i64=1}, 0, 0, AF, "wavet" },
+    { "coif5", "coif5", 0, AV_OPT_TYPE_CONST,  {.i64=2}, 0, 0, AF, "wavet" },
+    { "rbior68", "rbior68", 0, AV_OPT_TYPE_CONST,  {.i64=3}, 0, 0, AF, "wavet" },
+    { "percent", "set percent of full denoising", OFFSET(percent),AV_OPT_TYPE_DOUBLE, {.dbl=85}, 0, 100, AF },
+    { "profile", "profile noise", OFFSET(need_profile), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AF },
+    { "frames", "set frame size", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=8192}, 1024, 262144, AF },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(afwtdn);
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layouts = NULL;
+    static const enum AVSampleFormat sample_fmts[] = {
+        AV_SAMPLE_FMT_DBLP,
+        AV_SAMPLE_FMT_NONE
+    };
+    int ret;
+
+    formats = ff_make_format_list(sample_fmts);
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ret = ff_set_common_formats(ctx, formats);
+    if (ret < 0)
+        return ret;
+
+    layouts = ff_all_channel_counts();
+    if (!layouts)
+        return AVERROR(ENOMEM);
+
+    ret = ff_set_common_channel_layouts(ctx, layouts);
+    if (ret < 0)
+        return ret;
+
+    formats = ff_all_samplerates();
+    return ff_set_common_samplerates(ctx, formats);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    AudioFWTDNContext *s = ctx->priv;
+    int N, i;
+
+    switch (s->wavelet_type) {
+    case 0:
+        s->wavelet_length = 8;
+        s->lp  = deb4_lp;
+        s->hp  = deb4_hp;
+        s->ilp = deb4_ilp;
+        s->ihp = deb4_ihp;
+        break;
+    case 1:
+        s->wavelet_length = 20;
+        s->lp  = deb10_lp;
+        s->hp  = deb10_hp;
+        s->ilp = deb10_ilp;
+        s->ihp = deb10_ihp;
+        break;
+    case 2:
+        s->wavelet_length = 30;
+        s->lp  = coif5_lp;
+        s->hp  = coif5_hp;
+        s->ilp = coif5_ilp;
+        s->ihp = coif5_ihp;
+        break;
+    case 3:
+        s->wavelet_length = 18;
+        s->lp  = rbior68_lp;
+        s->hp  = rbior68_hp;
+        s->ilp = rbior68_ilp;
+        s->ihp = rbior68_ihp;
+        break;
+    default:
+        av_assert0(0);
+    }
+
+    s->levels = FFMIN(s->levels, lrint(log(s->nb_samples / (s->wavelet_length - 1.0)) / M_LN2));
+    av_log(ctx, AV_LOG_VERBOSE, "levels:%d\n", s->levels);
+    N = s->nb_samples;
+    i = s->levels;
+
+    while (i > 0) {
+        N = N + s->wavelet_length - 2;
+        N = ceil(N / 2.0);
+        s->length[i] = N;
+        s->out_length += N;
+        i--;
+    }
+
+    s->length[0]  = s->length[1];
+    s->out_length += s->length[0];
+
+    s->temp0 = ff_get_audio_buffer(outlink, s->out_length);
+    s->temp1 = ff_get_audio_buffer(outlink, s->out_length);
+    s->wtc = ff_get_audio_buffer(outlink, s->out_length);
+    s->power = ff_get_audio_buffer(outlink, s->out_length);
+    s->filter = ff_get_audio_buffer(outlink, s->out_length);
+    s->signal = ff_get_audio_buffer(outlink, s->out_length);
+    s->profile = ff_get_audio_buffer(outlink, MAX_LEVELS);
+    if (!s->temp0 || !s->temp1 || !s->wtc ||
+        !s->power || !s->profile || !s->filter ||
+        !s->signal)
+        return AVERROR(ENOMEM);
+
+    return 0;
+}
+
+static void dwt(double *src, int N,
+                const double *lf, const double *hf, int flen,
+                double *low, double *high, int lhlen)
+{
+    for (int i = 0; i < lhlen; i++) {
+        const int t = 2 * i + 1;
+
+        low[i] = 0.0;
+        high[i] = 0.0;
+
+        for (int l = 0; l < flen; l++) {
+            if (t - l >= 0 && t - l < N) {
+                const int is = t - l;
+                low[i] += lf[l] * src[is];
+                high[i] += hf[l] * src[is];
+            } else if (t - l < 0) {
+                const int is = -t + l - 1;
+                low[i] += lf[l] * src[is];
+                high[i] += hf[l] * src[is];
+            } else if (t - l >= N) {
+                const int is = 2 * N - t + l - 1;
+                low[i] += lf[l] * src[is];
+                high[i] += hf[l] * src[is];
+            }
+        }
+    }
+}
+
+static void idwt(double *low, int lhlen, double *high,
+                 const double *lf, const double *hf,
+                 int flen, double *dst)
+{
+    int m = -2, n = -1;
+
+    for (int v = 0; v < lhlen; v++) {
+        m += 2;
+        n += 2;
+        dst[m] = 0.0;
+        dst[n] = 0.0;
+        for (int l = 0; l < flen / 2; l++) {
+            const int t = 2 * l;
+
+            if (v - l >= 0 && v - l < lhlen) {
+                const int is = v - l;
+
+                dst[m] += lf[t] * low[is] + hf[t] * high[is];
+                dst[n] += lf[t + 1] * low[is] + hf[t + 1] * high[is];
+            }
+        }
+    }
+}
+
+static void dwt_levels(AudioFWTDNContext *s, int levels, int inlength, int out_length,
+                       const double *in, double *temp0, double *temp1, double *wtc)
+{
+    int N = out_length;
+    int temp_len = s->nb_samples;
+
+    for (int i = 0; i < inlength; i++)
+        temp0[i] = in[i];
+    for (int i = inlength; i < s->nb_samples; i++)
+        temp0[i] = 0.;
+
+    for (int level = 0; level < levels; level++) {
+        const int level_length = s->length[levels - level];
+
+        N -= level_length;
+        dwt(temp0, temp_len, s->lp, s->hp, s->wavelet_length, temp1, wtc + N, level_length);
+        temp_len = s->length[levels - level];
+
+        if (level == levels - 1) {
+            for (int i = 0; i < level_length; i++)
+                wtc[i] = temp1[i];
+        } else {
+            for (int i = 0; i < level_length; i++)
+                temp0[i] = temp1[i];
+        }
+    }
+}
+
+static void idwt_levels(AudioFWTDNContext *s, int levels, double *out,
+                        double *temp, double *wtc)
+{
+    const int app_len = s->length[0];
+    const int lf = s->wavelet_length;
+    int iter = app_len;
+
+    for (int i = 0; i < app_len; i++)
+        out[i] = wtc[i];
+
+    for (int i = 0; i < levels; i++) {
+        const int det_len = s->length[i + 1];
+
+        idwt(out, det_len, wtc + iter, s->ilp, s->ihp, s->wavelet_length, temp);
+        for (int k = lf - 2; k < 2 * det_len; k++)
+            out[k - lf + 2] = temp[k];
+
+        iter += det_len;
+    }
+}
+
+static void denoise_level(double *out, const double *in, double *filter, double *signal, double percent, int length)
+{
+    const double x = percent * 0.01;
+    const double y = 1.0 - x;
+
+    for (int i = 0; i < length; i++)
+        out[i] = in[i] * (x * filter[i] * signal[i] + y);
+}
+
+static double sqr(double in)
+{
+    return in * in;
+}
+
+static void power_average(const double *in, double *out, int length)
+{
+    out[0] = sqr(in[0]);
+    for (int i = 1; i < length; i++)
+        out[i] = 0.1 * sqr(in[i]) + 0.9 * out[i - 1];
+}
+
+static void noise_filter(const double *in, double *out, double profile, double ak, int length)
+{
+    for (int i = 0; i < length; i++)
+        out[i] = 1.0 - profile * ak / in[i];
+}
+
+static void signal_filter(const double *in, double *out, double profile, double ak, int length)
+{
+    for (int i = 0; i < length; i++)
+        out[i] = in[i] >= profile * ak;
+}
+
+static void measure_level_profile(AVFilterContext *ctx, const double *wtc, double *profile, int length)
+{
+    double sum = 0.;
+
+    for (int i = 0; i < length; i++)
+        sum += sqr(wtc[i]);
+
+    *profile = sum / length;
+}
+
+typedef struct ThreadData {
+    AVFrame *in, *out;
+} ThreadData;
+
+static int filter_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
+{
+    AudioFWTDNContext *s = ctx->priv;
+    ThreadData *td = arg;
+    AVFrame *in = td->in;
+    AVFrame *out = td->out;
+    const double *src = (const double *)(in->extended_data[ch]);
+    double *temp0 = (double *)s->temp0->extended_data[ch];
+    double *temp1 = (double *)s->temp1->extended_data[ch];
+    double *wtc = (double *)s->wtc->extended_data[ch];
+    double *dst = (double *)out->extended_data[ch];
+    double *profile = (double *)s->profile->extended_data[ch];
+    double *power = (double *)s->power->extended_data[ch];
+    double *filter = (double *)s->filter->extended_data[ch];
+    double *signal = (double *)s->signal->extended_data[ch];
+    int offset = 0;
+
+    dwt_levels(s, s->levels, in->nb_samples, s->out_length, src, temp0, temp1, wtc);
+
+    if (!s->got_profile && s->need_profile) {
+        for (int level = 0; level <= s->levels; level++) {
+            measure_level_profile(ctx, wtc + offset, &profile[level], s->length[level]);
+            offset += s->length[level];
+        }
+        offset = 0;
+    } else if (!s->got_profile && !s->need_profile) {
+        for (int level = 0; level <= s->levels; level++)
+            profile[level] = s->sigma / 1000000.;
+    }
+
+    for (int level = 0; level <= s->levels; level++) {
+        const double ak = 2.0 + ((4.0 * level) / s->levels);
+        const int length = s->length[level];
+
+        power_average(wtc + offset, power + offset, length);
+        noise_filter(power + offset, filter + offset, profile[level], ak, length);
+        signal_filter(power + offset, signal + offset, profile[level], ak, length);
+        denoise_level(wtc + offset, wtc + offset, filter + offset, signal + offset, s->percent, length);
+        offset += length;
+    }
+
+    idwt_levels(s, s->levels, dst, temp0, wtc);
+
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AudioFWTDNContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    ThreadData td;
+    AVFrame *out = NULL;
+
+    out = ff_get_audio_buffer(outlink, in->nb_samples);
+    if (!out) {
+        av_frame_free(&in);
+        return AVERROR(ENOMEM);
+    }
+    out->pts = in->pts;
+
+    td.in  = in;
+    td.out = out;
+    ctx->internal->execute(ctx, filter_channel, &td, NULL, inlink->channels);
+    if (s->need_profile)
+        s->got_profile = 1;
+
+    av_frame_free(&in);
+    return ff_filter_frame(outlink, out);
+}
+
+static int activate(AVFilterContext *ctx)
+{
+    AVFilterLink *inlink = ctx->inputs[0];
+    AVFilterLink *outlink = ctx->outputs[0];
+    AudioFWTDNContext *s = ctx->priv;
+    AVFrame *in = NULL;
+    int ret;
+
+    FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
+
+    ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
+    if (ret < 0)
+        return ret;
+    if (ret > 0)
+        return filter_frame(inlink, in);
+
+    FF_FILTER_FORWARD_STATUS(inlink, outlink);
+    FF_FILTER_FORWARD_WANTED(outlink, inlink);
+
+    return FFERROR_NOT_READY;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    AudioFWTDNContext *s = ctx->priv;
+
+    av_frame_free(&s->filter);
+    av_frame_free(&s->power);
+    av_frame_free(&s->profile);
+    av_frame_free(&s->signal);
+    av_frame_free(&s->temp0);
+    av_frame_free(&s->temp1);
+    av_frame_free(&s->wtc);
+}
+
+static const AVFilterPad inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_AUDIO,
+    },
+    { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_AUDIO,
+        .config_props  = config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_af_afwtdn = {
+    .name          = "afwtdn",
+    .description   = NULL_IF_CONFIG_SMALL("Reduce broadband noise from stream using Fast Wavelet Transform."),
+    .query_formats = query_formats,
+    .priv_size     = sizeof(AudioFWTDNContext),
+    .priv_class    = &afwtdn_class,
+    .activate      = activate,
+    .uninit        = uninit,
+    .inputs        = inputs,
+    .outputs       = outputs,
+    .flags         = AVFILTER_FLAG_SLICE_THREADS,
+};
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 1183e40267..de5884529c 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -43,6 +43,7 @@ extern AVFilter ff_af_afftdn;
 extern AVFilter ff_af_afftfilt;
 extern AVFilter ff_af_afir;
 extern AVFilter ff_af_aformat;
+extern AVFilter ff_af_afwtdn;
 extern AVFilter ff_af_agate;
 extern AVFilter ff_af_aiir;
 extern AVFilter ff_af_aintegral;
