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avfilter/af_adynamicequalizer: rework processing

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This commit is contained in:
Paul B Mahol 2022-10-07 23:57:46 +02:00
parent 94644343a6
commit 5676b7cdcf
2 changed files with 84 additions and 123 deletions
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28
doc/filters.texi
View File

@ -897,25 +897,17 @@ Set the amount of milliseconds the signal from detection has to fall below the
detection threshold before equalization ends.
Default is 200. Allowed range is between 1 and 2000.
@item knee
Curve the sharp knee around the detection threshold to calculate
equalization gain more softly.
Default is 1. Allowed range is between 0 and 8.
@item ratio
Set the ratio by which the equalization gain is raised.
Default is 1. Allowed range is between 1 and 20.
Default is 1. Allowed range is between 0 and 30.
@item makeup
Set the makeup offset in dB by which the equalization gain is raised.
Default is 0. Allowed range is between 0 and 30.
Set the makeup offset by which the equalization gain is raised.
Default is 0. Allowed range is between 0 and 100.
@item range
Set the max allowed cut/boost amount in dB. Default is 0.
Allowed range is from 0 to 200.
@item slew
Set the slew factor. Default is 1. Allowed range is from 1 to 200.
Set the max allowed cut/boost amount. Default is 50.
Allowed range is from 1 to 200.
@item mode
Set the mode of filter operation, can be one of the following:
@ -939,6 +931,16 @@ Set the type of target filter, can be one of the following:
@item highshelf
@end table
Default type is @samp{bell}.
@item direction
Set processing direction relative to threshold.
@table @samp
@item downward
Boost or cut if threshhold is higher than detected volume.
@item upward
Boost or cut if threshhold is lower than detected volume.
@end table
Default direction is @samp{downward}.
@end table
@subsection Commands

119
libavfilter/af_adynamicequalizer.c
View File

@ -34,13 +34,12 @@ typedef struct AudioDynamicEqualizerContext {
double ratio;
double range;
double makeup;
double knee;
double slew;
double attack;
double release;
double attack_coef;
double release_coef;
int mode;
int direction;
int type;
AVFrame *state;
@ -55,6 +54,12 @@ static int config_input(AVFilterLink *inlink)
if (!s->state)
return AVERROR(ENOMEM);
for (int ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
double *state = (double *)s->state->extended_data[ch];
state[4] = 1.;
}
return 0;
}
@ -71,69 +76,6 @@ static double get_svf(double in, double *m, double *a, double *b)
return m[0] * v0 + m[1] * v1 + m[2] * v2;
}
static inline double from_dB(double x)
{
return exp(0.05 * x * M_LN10);
}
static inline double to_dB(double x)
{
return 20. * log10(x);
}
static inline double sqr(double x)
{
return x * x;
}
static double get_gain(double in, double srate, double makeup,
double aattack, double iratio, double knee, double range,
double thresdb, double slewfactor, double *state,
double attack_coeff, double release_coeff, double nc)
{
double width = (6. * knee) + 0.01;
double cdb = 0.;
double Lgain = 1.;
double Lxg, Lxl, Lyg, Lyl, Ly1;
double checkwidth = 0.;
double slewwidth = 1.8;
int attslew = 0;
Lyg = 0.;
Lxg = to_dB(fabs(in) + DBL_EPSILON);
Lyg = Lxg + (iratio - 1.) * sqr(Lxg - thresdb + width * .5) / (2. * width);
checkwidth = 2. * fabs(Lxg - thresdb);
if (2. * (Lxg - thresdb) < -width) {
Lyg = Lxg;
} else if (checkwidth <= width) {
Lyg = thresdb + (Lxg - thresdb) * iratio;
if (checkwidth <= slewwidth) {
if (Lyg >= state[2])
attslew = 1;
}
} else if (2. * (Lxg - thresdb) > width) {
Lyg = thresdb + (Lxg - thresdb) * iratio;
}
attack_coeff = attslew ? aattack : attack_coeff;
Lxl = Lxg - Lyg;
Ly1 = fmax(Lxl, release_coeff * state[1] +(1. - release_coeff) * Lxl);
Lyl = attack_coeff * state[0] + (1. - attack_coeff) * Ly1;
cdb = -Lyl;
Lgain = from_dB(nc * fmin(cdb - makeup, range));
state[0] = Lyl;
state[1] = Ly1;
state[2] = Lyg;
return Lgain;
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
@ -146,25 +88,24 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
AVFrame *out = td->out;
const double sample_rate = in->sample_rate;
const double makeup = s->makeup;
const double iratio = 1. / s->ratio;
const double ratio = s->ratio;
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 = to_dB(s->threshold + DBL_EPSILON);
const double threshold = s->threshold;
const double release = s->release_coef;
const double irelease = 1. - release;
const double attack = s->attack_coef;
const double iattack = 1. - attack;
const double dqfactor = s->dqfactor;
const double tqfactor = s->tqfactor;
const double fg = tan(M_PI * tfrequency / sample_rate);
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 direction = s->direction;
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));
const double nc = mode == 0 ? 1. : -1.;
double da[3], dm[3];
{
@ -175,7 +116,7 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
da[2] = dg * da[1];
dm[0] = 0.;
dm[1] = 1.;
dm[1] = k;
dm[2] = 0.;
}
@ -192,9 +133,25 @@ 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);
gain = get_gain(detect, sample_rate, makeup,
aattack, iratio, knee, range, threshold, slew,
&state[4], attack, release, nc);
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)
detect = av_clipd(1. + makeup + (threshold - detect) * ratio, 1., range);
else if (direction == 1 && mode == 0 && detect > threshold)
detect = 1. / av_clipd(1. + makeup + (detect - threshold) * ratio, 1., range);
else if (direction == 1 && mode == 1 && detect > threshold)
detect = av_clipd(1. + makeup + (detect - threshold) * ratio, 1., range);
else
detect = 1.;
if (detect < state[4]) {
detect = iattack * detect + attack * state[4];
} else {
detect = irelease * detect + release * state[4];
}
if (state[4] != detect || n == 0) {
state[4] = gain = detect;
switch (type) {
case 0:
@ -233,6 +190,7 @@ static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
fm[2] = 1. - gain * gain;
break;
}
}
v = get_svf(src[n], fm, fa, &state[2]);
v = mode == -1 ? listen : v;
@ -298,11 +256,9 @@ static const AVOption adynamicequalizer_options[] = {
{ "tqfactor", "set target Q factor", OFFSET(tqfactor), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.001, 1000, FLAGS },
{ "attack", "set attack duration", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 1, 2000, FLAGS },
{ "release", "set release duration", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=200}, 1, 2000, FLAGS },
{ "knee", "set knee factor", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 8, FLAGS },
{ "ratio", "set ratio factor", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 20, FLAGS },
{ "makeup", "set makeup gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 30, FLAGS },
{ "range", "set max gain", OFFSET(range), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 200, FLAGS },
{ "slew", "set slew factor", OFFSET(slew), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 200, FLAGS },
{ "ratio", "set ratio factor", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 30, FLAGS },
{ "makeup", "set makeup gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 100, FLAGS },
{ "range", "set max gain", OFFSET(range), AV_OPT_TYPE_DOUBLE, {.dbl=50}, 1, 200, FLAGS },
{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, -1, 1, FLAGS, "mode" },
{ "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" },
@ -311,6 +267,9 @@ static const AVOption adynamicequalizer_options[] = {
{ "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" },
{ "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" },
{ NULL }
};