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avfilter/af_afftdn: generalize noise profile mean estimation

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This commit is contained in:
Paul B Mahol 2022-03-12 11:31:54 +01:00
parent 983b15e5f4
commit 32e99157c2
1 changed files with 16 additions and 9 deletions
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25
libavfilter/af_afftdn.c
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@ -594,6 +594,18 @@ static void set_parameters(AudioFFTDeNoiseContext *s)
}
}
static void reduce_mean(int *band_noise)
{
double mean = 0.f;
for (int i = 0; i < NB_PROFILE_BANDS; i++)
mean += band_noise[i];
mean /= NB_PROFILE_BANDS;
for (int i = 0; i < NB_PROFILE_BANDS; i++)
band_noise[i] -= mean;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
@ -666,7 +678,7 @@ static int config_input(AVFilterLink *inlink)
for (int ch = 0; ch < inlink->channels; ch++) {
DeNoiseChannel *dnch = &s->dnch[ch];
float scale;
float scale = 0.f;
switch (s->noise_type) {
case WHITE_NOISE:
@ -675,11 +687,11 @@ static int config_input(AVFilterLink *inlink)
break;
case VINYL_NOISE:
for (i = 0; i < NB_PROFILE_BANDS; i++)
dnch->band_noise[i] = get_band_noise(s, i, 50.0, 500.5, 2125.0) + FFMAX(i - 7, 0);
dnch->band_noise[i] = get_band_noise(s, i, 50.0, 500.5, 2125.0);
break;
case SHELLAC_NOISE:
for (i = 0; i < NB_PROFILE_BANDS; i++)
dnch->band_noise[i] = get_band_noise(s, i, 1.0, 500.0, 1.0E10) + FFMAX(i - 12, -5);
dnch->band_noise[i] = get_band_noise(s, i, 1.0, 500.0, 1.0E10);
break;
case CUSTOM_NOISE:
read_custom_noise(s, ch);
@ -688,6 +700,7 @@ static int config_input(AVFilterLink *inlink)
return AVERROR_BUG;
}
reduce_mean(dnch->band_noise);
dnch->sfm_threshold = 0.8;
dnch->sfm_alpha = 0.05;
@ -974,12 +987,6 @@ static void set_noise_profile(AudioFFTDeNoiseContext *s,
sum += temp[m];
d1 = (int)(sum / NB_PROFILE_BANDS - 0.5);
if (!new_profile)
i = lrint(temp[7] - d1);
for (d1 -= dnch->band_noise[7] - i; d1 > -20.0; d1 -= 1.0)
;
for (int m = 0; m < NB_PROFILE_BANDS; m++)
temp[m] -= d1;