mirror of https://git.ffmpeg.org/ffmpeg.git
avfilter/af_agate: implement mode option
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@ -1308,9 +1308,16 @@ Shorter signals than the chosen attack time will be left untouched.
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Set input level before filtering.
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Set input level before filtering.
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Default is 1. Allowed range is from 0.015625 to 64.
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Default is 1. Allowed range is from 0.015625 to 64.
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@item mode
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Set the mode of operation. Can be @code{upward} or @code{downward}.
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Default is @code{downward}. If set to @code{upward} mode, higher parts of signal
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will be amplified, expanding dynamic range in upward direction.
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Otherwise, in case of @code{downward} lower parts of signal will be reduced.
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@item range
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@item range
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Set the level of gain reduction when the signal is below the threshold.
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Set the level of gain reduction when the signal is below the threshold.
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Default is 0.06125. Allowed range is from 0 to 1.
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Default is 0.06125. Allowed range is from 0 to 1.
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Setting this to 0 disables reduction and then filter behaves like expander.
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@item threshold
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@item threshold
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If a signal rises above this level the gain reduction is released.
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If a signal rises above this level the gain reduction is released.
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@ -4331,9 +4338,16 @@ The filter accepts the following options:
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Set input level before filtering.
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Set input level before filtering.
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Default is 1. Allowed range is from 0.015625 to 64.
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Default is 1. Allowed range is from 0.015625 to 64.
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@item mode
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Set the mode of operation. Can be @code{upward} or @code{downward}.
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Default is @code{downward}. If set to @code{upward} mode, higher parts of signal
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will be amplified, expanding dynamic range in upward direction.
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Otherwise, in case of @code{downward} lower parts of signal will be reduced.
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@item range
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@item range
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Set the level of gain reduction when the signal is below the threshold.
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Set the level of gain reduction when the signal is below the threshold.
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Default is 0.06125. Allowed range is from 0 to 1.
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Default is 0.06125. Allowed range is from 0 to 1.
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Setting this to 0 disables reduction and then filter behaves like expander.
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@item threshold
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@item threshold
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If a signal rises above this level the gain reduction is released.
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If a signal rises above this level the gain reduction is released.
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@ -47,11 +47,13 @@ typedef struct AudioGateContext {
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double range;
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double range;
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int link;
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int link;
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int detection;
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int detection;
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int mode;
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double thres;
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double thres;
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double knee_start;
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double knee_start;
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double lin_knee_stop;
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double knee_stop;
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double knee_stop;
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double lin_knee_start;
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double lin_knee_stop;
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double lin_slope;
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double lin_slope;
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double attack_coeff;
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double attack_coeff;
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double release_coeff;
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double release_coeff;
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@ -65,6 +67,9 @@ typedef struct AudioGateContext {
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static const AVOption options[] = {
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static const AVOption options[] = {
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{ "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
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{ "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
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{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A, "mode" },
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{ "downward",0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "mode" },
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{ "upward", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "mode" },
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{ "range", "set max gain reduction", OFFSET(range), AV_OPT_TYPE_DOUBLE, {.dbl=0.06125}, 0, 1, A },
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{ "range", "set max gain reduction", OFFSET(range), AV_OPT_TYPE_DOUBLE, {.dbl=0.06125}, 0, 1, A },
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{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0, 1, A },
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{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0, 1, A },
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{ "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 9000, A },
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{ "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 9000, A },
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@ -88,7 +93,6 @@ static int agate_config_input(AVFilterLink *inlink)
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AudioGateContext *s = ctx->priv;
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AudioGateContext *s = ctx->priv;
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double lin_threshold = s->threshold;
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double lin_threshold = s->threshold;
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double lin_knee_sqrt = sqrt(s->knee);
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double lin_knee_sqrt = sqrt(s->knee);
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double lin_knee_start;
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if (s->detection)
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if (s->detection)
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lin_threshold *= lin_threshold;
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lin_threshold *= lin_threshold;
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@ -96,9 +100,9 @@ static int agate_config_input(AVFilterLink *inlink)
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s->attack_coeff = FFMIN(1., 1. / (s->attack * inlink->sample_rate / 4000.));
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s->attack_coeff = FFMIN(1., 1. / (s->attack * inlink->sample_rate / 4000.));
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s->release_coeff = FFMIN(1., 1. / (s->release * inlink->sample_rate / 4000.));
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s->release_coeff = FFMIN(1., 1. / (s->release * inlink->sample_rate / 4000.));
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s->lin_knee_stop = lin_threshold * lin_knee_sqrt;
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s->lin_knee_stop = lin_threshold * lin_knee_sqrt;
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lin_knee_start = lin_threshold / lin_knee_sqrt;
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s->lin_knee_start = lin_threshold / lin_knee_sqrt;
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s->thres = log(lin_threshold);
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s->thres = log(lin_threshold);
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s->knee_start = log(lin_knee_start);
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s->knee_start = log(s->lin_knee_start);
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s->knee_stop = log(s->lin_knee_stop);
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s->knee_stop = log(s->lin_knee_stop);
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return 0;
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return 0;
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@ -112,9 +116,8 @@ static int agate_config_input(AVFilterLink *inlink)
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static double output_gain(double lin_slope, double ratio, double thres,
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static double output_gain(double lin_slope, double ratio, double thres,
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double knee, double knee_start, double knee_stop,
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double knee, double knee_start, double knee_stop,
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double lin_knee_stop, double range)
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double range, int mode)
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{
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{
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if (lin_slope < lin_knee_stop) {
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double slope = log(lin_slope);
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double slope = log(lin_slope);
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double tratio = ratio;
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double tratio = ratio;
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double gain = 0.;
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double gain = 0.;
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@ -125,15 +128,16 @@ static double output_gain(double lin_slope, double ratio, double thres,
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gain = (slope - thres) * tratio + thres;
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gain = (slope - thres) * tratio + thres;
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delta = tratio;
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delta = tratio;
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if (knee > 1. && slope > knee_start) {
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if (mode) {
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if (knee > 1. && slope < knee_stop)
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gain = hermite_interpolation(slope, knee_stop, knee_start, ((knee_stop - thres) * tratio + thres), knee_start, delta, 1.);
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} else {
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if (knee > 1. && slope > knee_start)
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gain = hermite_interpolation(slope, knee_start, knee_stop, ((knee_start - thres) * tratio + thres), knee_stop, delta, 1.);
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gain = hermite_interpolation(slope, knee_start, knee_stop, ((knee_start - thres) * tratio + thres), knee_stop, delta, 1.);
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}
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}
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return FFMAX(range, exp(gain - slope));
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return FFMAX(range, exp(gain - slope));
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}
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}
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return 1.;
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}
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static void gate(AudioGateContext *s,
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static void gate(AudioGateContext *s,
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const double *src, double *dst, const double *scsrc,
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const double *src, double *dst, const double *scsrc,
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int nb_samples, double level_in, double level_sc,
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int nb_samples, double level_in, double level_sc,
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@ -146,6 +150,7 @@ static void gate(AudioGateContext *s,
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for (n = 0; n < nb_samples; n++, src += inlink->channels, dst += inlink->channels, scsrc += sclink->channels) {
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for (n = 0; n < nb_samples; n++, src += inlink->channels, dst += inlink->channels, scsrc += sclink->channels) {
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double abs_sample = fabs(scsrc[0] * level_sc), gain = 1.0;
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double abs_sample = fabs(scsrc[0] * level_sc), gain = 1.0;
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int detected;
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if (s->link == 1) {
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if (s->link == 1) {
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for (c = 1; c < sclink->channels; c++)
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for (c = 1; c < sclink->channels; c++)
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@ -161,10 +166,16 @@ static void gate(AudioGateContext *s,
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abs_sample *= abs_sample;
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abs_sample *= abs_sample;
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s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? attack_coeff : release_coeff);
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s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? attack_coeff : release_coeff);
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if (s->lin_slope > 0.0)
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if (s->mode)
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detected = s->lin_slope > s->lin_knee_start;
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else
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detected = s->lin_slope < s->lin_knee_stop;
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if (s->lin_slope > 0.0 && detected)
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gain = output_gain(s->lin_slope, s->ratio, s->thres,
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gain = output_gain(s->lin_slope, s->ratio, s->thres,
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s->knee, s->knee_start, s->knee_stop,
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s->knee, s->knee_start, s->knee_stop,
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s->lin_knee_stop, s->range);
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s->range, s->mode);
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for (c = 0; c < inlink->channels; c++)
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for (c = 0; c < inlink->channels; c++)
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dst[c] = src[c] * level_in * gain * makeup;
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dst[c] = src[c] * level_in * gain * makeup;
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