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Code Issues Releases Activity

avfilter/af_afftdn: allow user to change ratio factor

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While here change default to lower value as previous
value were causing too much smearing on time axis of spectrogram.
This commit is contained in:
Paul B Mahol 2022-03-12 23:37:02 +01:00
parent b2c6c7c4c5
commit 546afd0d49
2 changed files with 13 additions and 4 deletions
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6
doc/filters.texi
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@ -1341,6 +1341,12 @@ Pass only noise.
Default value is @var{output}.
@end table
@item adaptivity, ad
Set the adaptivity factor, used how fast to adapt gains adjustments per
each frequency bin. Value @var{0} enables instant adaptation, while higher values
react much slower.
Allowed range is from @var{0} to @var{1}. Default value is @var{0.5}.
@end table
@subsection Commands

11
libavfilter/af_afftdn.c
View File

@ -30,8 +30,6 @@
#include "filters.h"
#define C (M_LN10 * 0.1)
#define RATIO 0.98
#define RRATIO (1.0 - RATIO)
#define NB_PROFILE_BANDS (15)
enum OutModes {
@ -103,6 +101,7 @@ typedef struct AudioFFTDeNoiseContext {
int track_noise;
int track_residual;
int output_mode;
float ratio;
float last_residual_floor;
float last_noise_floor;
@ -182,6 +181,8 @@ static const AVOption afftdn_options[] = {
{ "o", "output", 0, AV_OPT_TYPE_CONST, {.i64 = OUT_MODE}, 0, 0, AFR, "mode" },
{ "noise", "noise", 0, AV_OPT_TYPE_CONST, {.i64 = NOISE_MODE}, 0, 0, AFR, "mode" },
{ "n", "noise", 0, AV_OPT_TYPE_CONST, {.i64 = NOISE_MODE}, 0, 0, AFR, "mode" },
{ "adaptivity", "set adaptivity factor",OFFSET(ratio), AV_OPT_TYPE_FLOAT, {.dbl = 0.5}, 0, 1, AFR },
{ "ad", "set adaptivity factor",OFFSET(ratio), AV_OPT_TYPE_FLOAT, {.dbl = 0.5}, 0, 1, AFR },
{ NULL }
};
@ -315,6 +316,8 @@ static void process_frame(AudioFFTDeNoiseContext *s, DeNoiseChannel *dnch,
AVComplexFloat *fft_data,
double *prior, double *prior_band_excit, int track_noise)
{
const double ratio = s->ratio;
const double rratio = 1. - ratio;
double d1, d2, d3, gain;
int n = 0, i1;
@ -325,7 +328,7 @@ static void process_frame(AudioFFTDeNoiseContext *s, DeNoiseChannel *dnch,
dnch->noisy_data[i] = d1;
d2 = d1 / dnch->abs_var[i];
d3 = RATIO * prior[i] + RRATIO * fmax(d2 - 1.0, 0.0);
d3 = ratio * prior[i] + rratio * fmax(d2 - 1.0, 0.0);
gain = d3 / (1.0 + d3);
gain *= (gain + M_PI_4 / fmax(d2, 1.0E-6));
prior[i] = d2 * gain;
@ -802,7 +805,7 @@ static int config_input(AVFilterLink *inlink)
}
for (int i = 0; i <= s->fft_length2; i++)
prior[i] = RRATIO;
prior[i] = 1.0 - s->ratio;
for (int i = 0; i < s->buffer_length; i++)
dnch->out_samples[i] = 0;