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avfilter: add asuperpass and asuperstop filter

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This commit is contained in:
Paul B Mahol 2020-12-06 22:48:12 +01:00
parent 628d02a611
commit b607f19374
6 changed files with 185 additions and 5 deletions
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1
Changelog
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@ -52,6 +52,7 @@ version <next>:
- Microsoft Paint (MSP) version 2 decoder
- Microsoft Paint (MSP) demuxer
- AV1 monochrome encoding support via libaom >= 2.0.1
- asuperpass and asuperstop filter
version 4.3:

50
doc/filters.texi
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@ -2733,6 +2733,56 @@ Set input gain level. Allowed range is from 0 to 1. Default value is 1.
This filter supports the all above options as @ref{commands}.
@section asuperpass
Apply high order Butterworth band-pass filter.
The filter accepts the following options:
@table @option
@item centerf
Set center frequency in Hertz. Allowed range is 2 to 999999.
Default value is 1000.
@item order
Set filter order. Available values are from 4 to 20.
Default value is 4.
@item qfactor
Set Q-factor. Allowed range is from 0.01 to 100. Default value is 1.
@item level
Set input gain level. Allowed range is from 0 to 2. Default value is 1.
@end table
@subsection Commands
This filter supports the all above options as @ref{commands}.
@section asuperstop
Apply high order Butterworth band-stop filter.
The filter accepts the following options:
@table @option
@item centerf
Set center frequency in Hertz. Allowed range is 2 to 999999.
Default value is 1000.
@item order
Set filter order. Available values are from 4 to 20.
Default value is 4.
@item qfactor
Set Q-factor. Allowed range is from 0.01 to 100. Default value is 1.
@item level
Set input gain level. Allowed range is from 0 to 2. Default value is 1.
@end table
@subsection Commands
This filter supports the all above options as @ref{commands}.
@section atempo
Adjust audio tempo.

2
libavfilter/Makefile
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@ -92,6 +92,8 @@ OBJS-$(CONFIG_ASTREAMSELECT_FILTER) += f_streamselect.o framesync.o
OBJS-$(CONFIG_ASUBBOOST_FILTER) += af_asubboost.o
OBJS-$(CONFIG_ASUBCUT_FILTER) += af_asupercut.o
OBJS-$(CONFIG_ASUPERCUT_FILTER) += af_asupercut.o
OBJS-$(CONFIG_ASUPERPASS_FILTER) += af_asupercut.o
OBJS-$(CONFIG_ASUPERSTOP_FILTER) += af_asupercut.o
OBJS-$(CONFIG_ATEMPO_FILTER) += af_atempo.o
OBJS-$(CONFIG_ATRIM_FILTER) += trim.o
OBJS-$(CONFIG_AXCORRELATE_FILTER) += af_axcorrelate.o

129
libavfilter/af_asupercut.c
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@ -1,4 +1,7 @@
/*
* Copyright (c) 2005 Boðaç Topaktaþ
* Copyright (c) 2020 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
@ -33,6 +36,7 @@ typedef struct ASuperCutContext {
double cutoff;
double level;
double qfactor;
int order;
int filter_count;
@ -93,10 +97,11 @@ static int get_coeffs(AVFilterContext *ctx)
if (s->bypass)
return 0;
if (!strcmp(ctx->filter->name, "asubcut")) {
s->filter_count = s->order / 2 + (s->order & 1);
calc_q_factors(s->order, q);
if (!strcmp(ctx->filter->name, "asubcut")) {
if (s->order & 1) {
BiquadCoeffs *coeffs = &s->coeffs[0];
double omega = 2. * tan(M_PI * w0);
@ -119,7 +124,11 @@ static int get_coeffs(AVFilterContext *ctx)
coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
}
} else {
} else if (!strcmp(ctx->filter->name, "asupercut")) {
s->filter_count = s->order / 2 + (s->order & 1);
calc_q_factors(s->order, q);
if (s->order & 1) {
BiquadCoeffs *coeffs = &s->coeffs[0];
double omega = 2. * tan(M_PI * w0);
@ -142,6 +151,74 @@ static int get_coeffs(AVFilterContext *ctx)
coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
}
} else if (!strcmp(ctx->filter->name, "asuperpass")) {
double alpha, beta, gamma, theta;
double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
double d_E;
s->filter_count = s->order / 2;
d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
for (int b = 0; b < s->filter_count; b += 2) {
double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
double B = D * (d_E / 2.) / d;
double W = B + sqrt(B * B - 1.);
for (int j = 0; j < 2; j++) {
BiquadCoeffs *coeffs = &s->coeffs[b + j];
if (j == 1)
theta = 2. * atan(tan(theta_0 / 2.) / W);
else
theta = 2. * atan(W * tan(theta_0 / 2.));
beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
gamma = (0.5 + beta) * cos(theta);
alpha = 0.5 * (0.5 - beta) * sqrt(1. + pow((W - (1. / W)) / d, 2.));
coeffs->a1 = 2. * gamma;
coeffs->a2 = -2. * beta;
coeffs->b0 = 2. * alpha;
coeffs->b1 = 0.;
coeffs->b2 = -2. * alpha;
}
}
} else if (!strcmp(ctx->filter->name, "asuperstop")) {
double alpha, beta, gamma, theta;
double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
double d_E;
s->filter_count = s->order / 2;
d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
for (int b = 0; b < s->filter_count; b += 2) {
double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
double B = D * (d_E / 2.) / d;
double W = B + sqrt(B * B - 1.);
for (int j = 0; j < 2; j++) {
BiquadCoeffs *coeffs = &s->coeffs[b + j];
if (j == 1)
theta = 2. * atan(tan(theta_0 / 2.) / W);
else
theta = 2. * atan(W * tan(theta_0 / 2.));
beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
gamma = (0.5 + beta) * cos(theta);
alpha = 0.5 * (0.5 + beta) * ((1. - cos(theta)) / (1. - cos(theta_0)));
coeffs->a1 = 2. * gamma;
coeffs->a2 = -2. * beta;
coeffs->b0 = 2. * alpha;
coeffs->b1 = -4. * alpha * cos(theta_0);
coeffs->b2 = 2. * alpha;
}
}
}
return 0;
@ -327,3 +404,51 @@ AVFilter ff_af_asubcut = {
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
AVFILTER_FLAG_SLICE_THREADS,
};
static const AVOption asuperpass_options[] = {
{ "centerf","set center frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=1000}, 2, 999999, FLAGS },
{ "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=4}, 4, 20, FLAGS },
{ "qfactor","set Q-factor", OFFSET(qfactor),AV_OPT_TYPE_DOUBLE, {.dbl=1.},0.01, 100., FLAGS },
{ "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 2., FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(asuperpass);
AVFilter ff_af_asuperpass = {
.name = "asuperpass",
.description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-pass filter."),
.query_formats = query_formats,
.priv_size = sizeof(ASuperCutContext),
.priv_class = &asuperpass_class,
.uninit = uninit,
.inputs = inputs,
.outputs = outputs,
.process_command = process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
AVFILTER_FLAG_SLICE_THREADS,
};
static const AVOption asuperstop_options[] = {
{ "centerf","set center frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=1000}, 2, 999999, FLAGS },
{ "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=4}, 4, 20, FLAGS },
{ "qfactor","set Q-factor", OFFSET(qfactor),AV_OPT_TYPE_DOUBLE, {.dbl=1.},0.01, 100., FLAGS },
{ "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 2., FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(asuperstop);
AVFilter ff_af_asuperstop = {
.name = "asuperstop",
.description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-stop filter."),
.query_formats = query_formats,
.priv_size = sizeof(ASuperCutContext),
.priv_class = &asuperstop_class,
.uninit = uninit,
.inputs = inputs,
.outputs = outputs,
.process_command = process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
AVFILTER_FLAG_SLICE_THREADS,
};

2
libavfilter/allfilters.c
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@ -85,6 +85,8 @@ extern AVFilter ff_af_astreamselect;
extern AVFilter ff_af_asubboost;
extern AVFilter ff_af_asubcut;
extern AVFilter ff_af_asupercut;
extern AVFilter ff_af_asuperpass;
extern AVFilter ff_af_asuperstop;
extern AVFilter ff_af_atempo;
extern AVFilter ff_af_atrim;
extern AVFilter ff_af_axcorrelate;

2
libavfilter/version.h
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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
#define LIBAVFILTER_VERSION_MINOR 92
#define LIBAVFILTER_VERSION_MINOR 93
#define LIBAVFILTER_VERSION_MICRO 100