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avfilter/af_adynamicequalizer: add auto option

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This commit is contained in:
Paul B Mahol 2023-01-20 13:59:16 +01:00
parent 6869a80e76
commit 40512dbd96
2 changed files with 42 additions and 6 deletions
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20
doc/filters.texi
View File

@ -1034,11 +1034,27 @@ Default type is @samp{bell}.
Set processing direction relative to threshold.
@table @samp
@item downward
Boost or cut if threshhold is higher than detected volume.
Boost/Cut if threshold is higher/lower than detected volume.
@item upward
Boost or cut if threshhold is lower than detected volume.
Boost/Cut if threshold is lower/higher than detected volume.
@end table
Default direction is @samp{downward}.
@item auto
Automatically gather threshold from detection filter. By default
is @samp{disabled}.
This option is useful to detect threshold in certain time frame of
input audio stream, in such case option value is changed at runtime.
Available values are:
@table @samp
@item disabled
Disable using automatically gathered threshold value.
@item off
Stop picking threshold value.
@item on
Start picking threshold value.
@end table
@end table
@subsection Commands

28
libavfilter/af_adynamicequalizer.c
View File

@ -40,6 +40,7 @@ typedef struct AudioDynamicEqualizerContext {
double release_coef;
int mode;
int direction;
int detection;
int type;
AVFrame *state;
@ -92,7 +93,6 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
const double range = s->range;
const double dfrequency = fmin(s->dfrequency, sample_rate * 0.5);
const double tfrequency = fmin(s->tfrequency, sample_rate * 0.5);
const double threshold = s->threshold;
const double release = s->release_coef;
const double irelease = 1. - release;
const double attack = s->attack_coef;
@ -103,6 +103,7 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
const double dg = tan(M_PI * dfrequency / sample_rate);
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 detection = s->detection;
const int direction = s->direction;
const int mode = s->mode;
const int type = s->type;
@ -124,6 +125,10 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
const double *src = (const double *)in->extended_data[ch];
double *dst = (double *)out->extended_data[ch];
double *state = (double *)s->state->extended_data[ch];
const double threshold = detection == 0 ? state[5] : s->threshold;
if (detection < 0)
state[5] = threshold;
for (int n = 0; n < out->nb_samples; n++) {
double detect, gain, v, listen;
@ -133,6 +138,9 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
detect = listen = get_svf(src[n], dm, da, state);
detect = fabs(detect);
if (detection > 0)
state[5] = fmax(state[5], detect);
if (direction == 0 && mode == 0 && detect < threshold)
detect = 1. / av_clipd(1. + makeup + (threshold - detect) * ratio, 1., range);
else if (direction == 0 && mode == 1 && detect < threshold)
@ -144,10 +152,18 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
else
detect = 1.;
if (detect < state[4]) {
detect = iattack * detect + attack * state[4];
if (direction == 0) {
if (detect > state[4]) {
detect = iattack * detect + attack * state[4];
} else {
detect = irelease * detect + release * state[4];
}
} else {
detect = irelease * detect + release * state[4];
if (detect < state[4]) {
detect = iattack * detect + attack * state[4];
} else {
detect = irelease * detect + release * state[4];
}
}
if (state[4] != detect || n == 0) {
@ -270,6 +286,10 @@ static const AVOption adynamicequalizer_options[] = {
{ "direction", "set direction", OFFSET(direction), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "direction" },
{ "downward", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "direction" },
{ "upward", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "direction" },
{ "auto", "set auto threshold", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, FLAGS, "auto" },
{ "disabled", 0, 0, AV_OPT_TYPE_CONST, {.i64=-1}, 0, 0, FLAGS, "auto" },
{ "off", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "auto" },
{ "on", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "auto" },
{ NULL }
};