RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-12-28 18:32:22 +00:00
Code Issues Projects Releases Wiki Activity

avfilter/af_afftdn: allow user to change ratio factor

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
doc/filters.texi
View File

@ -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;