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avfilter/af_adynamicequalizer: set target filter type

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This commit is contained in:
Paul B Mahol 2022-04-28 21:57:49 +02:00
parent 4e284837e4
commit c27123606a
2 changed files with 45 additions and 2 deletions
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10
doc/filters.texi
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@ -913,6 +913,16 @@ Cut frequencies above detection threshold.
Boost frequencies bellow detection threshold.
@end table
Default mode is @samp{cut}.
@item tftype
Set the type of target filter, can be one of the following:
@table @samp
@item bell
@item lowshelf
@item highshelf
@end table
Default type is @samp{bell}.
@end table
@subsection Commands

37
libavfilter/af_adynamicequalizer.c
View File

@ -42,6 +42,7 @@ typedef struct AudioDynamicEqualizerContext {
double attack_coef;
double release_coef;
int mode;
int type;
AVFrame *state;
} AudioDynamicEqualizerContext;
@ -160,6 +161,7 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
const int start = (in->ch_layout.nb_channels * jobnr) / nb_jobs;
const int end = (in->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
const int mode = s->mode;
const int type = s->type;
const double knee = s->knee;
const double slew = s->slew;
const double aattack = exp(-1000. / ((s->attack + 2.0 * (slew - 1.)) * sample_rate));
@ -186,6 +188,7 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
for (int n = 0; n < out->nb_samples; n++) {
double detect, gain, v, listen;
double fa[3], fm[3];
double k, g;
detect = listen = get_svf(src[n], dm, da, state);
detect = fabs(detect);
@ -194,8 +197,9 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
aattack, iratio, knee, range, threshold, slew,
&state[4], attack, release, nc);
{
double k = 1. / (tqfactor * gain);
switch (type) {
case 0:
k = 1. / (tqfactor * gain);
fa[0] = 1. / (1. + fg * (fg + k));
fa[1] = fg * fa[0];
@ -204,6 +208,31 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
fm[0] = 1.;
fm[1] = k * (gain * gain - 1.);
fm[2] = 0.;
break;
case 1:
k = 1. / tqfactor;
g = fg / sqrt(gain);
fa[0] = 1. / (1. + g * (g + k));
fa[1] = g * fa[0];
fa[2] = g * fa[1];
fm[0] = 1.;
fm[1] = k * (gain - 1.);
fm[2] = gain * gain - 1.;
break;
case 2:
k = 1. / tqfactor;
g = fg / sqrt(gain);
fa[0] = 1. / (1. + g * (g + k));
fa[1] = g * fa[0];
fa[2] = g * fa[1];
fm[0] = gain * gain;
fm[1] = k * (1. - gain) * gain;
fm[2] = 1. - gain * gain;
break;
}
v = get_svf(src[n], fm, fa, &state[2]);
@ -279,6 +308,10 @@ static const AVOption adynamicequalizer_options[] = {
{ "listen", 0, 0, AV_OPT_TYPE_CONST, {.i64=-1}, 0, 0, FLAGS, "mode" },
{ "cut", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
{ "boost", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
{ "tftype", "set target filter type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, FLAGS, "type" },
{ "bell", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "type" },
{ "lowshelf", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "type" },
{ "highshelf",0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "type" },
{ NULL }
};