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filter-chain: add Level control input port for noisegate

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This makes it possible to use another volume measurement algorithm to
drive the noise gate, such as a VAD algorithm.
This commit is contained in:
Wim Taymans 2025-07-17 12:10:25 +02:00
parent 4b37f3db3d
commit b3dddfed6a
2 changed files with 32 additions and 17 deletions
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45
spa/plugins/filter-graph/plugin_builtin.c
View file

@ -2892,26 +2892,31 @@ static struct spa_fga_port noisegate_ports[] = {
.flags = SPA_FGA_PORT_OUTPUT | SPA_FGA_PORT_AUDIO,
},
{ .index = 2,
.name = "Open Threshold",
.name = "Level",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.004f, .min = 0.0f, .max = 1.0f
.def = NAN
},
{ .index = 3,
.name = "Close Threshold",
.name = "Open Threshold",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.003f, .min = 0.0f, .max = 1.0f
.def = 0.04f, .min = 0.0f, .max = 1.0f
},
{ .index = 4,
.name = "Close Threshold",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.03f, .min = 0.0f, .max = 1.0f
},
{ .index = 5,
.name = "Attack (s)",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.005f, .min = 0.0f, .max = 1.0f
},
{ .index = 5,
{ .index = 6,
.name = "Hold (s)",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.050f, .min = 0.0f, .max = 1.0f
},
{ .index = 6,
{ .index = 7,
.name = "Release (s)",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.010f, .min = 0.0f, .max = 1.0f
@ -2923,9 +2928,10 @@ static void noisegate_run(void * Instance, unsigned long SampleCount)
struct builtin *impl = Instance;
float *in = impl->port[0];
float *out = impl->port[1];
float in_lev = impl->port[2][0];
unsigned long n;
float o_thres = impl->port[2][0];
float c_thres = impl->port[3][0];
float o_thres = impl->port[3][0];
float c_thres = impl->port[4][0];
float gate, hold, o_rate, c_rate, level;
int mode;
@ -2937,20 +2943,25 @@ static void noisegate_run(void * Instance, unsigned long SampleCount)
return;
}
o_rate = 1.0f / (impl->port[4][0] * impl->rate);
c_rate = 1.0f / (impl->port[6][0] * impl->rate);
o_rate = 1.0f / (impl->port[5][0] * impl->rate);
c_rate = 1.0f / (impl->port[7][0] * impl->rate);
gate = impl->gate;
hold = impl->hold;
mode = impl->mode;
level = impl->last;
for (n = 0; n < SampleCount; n++) {
float lev = fabsf(in[n]);
spa_log_trace_fp(impl->log, "%f %d %f", level, mode, gate);
if (lev > level)
level = lev;
else
level = lev * 0.05f + level * 0.95f;
for (n = 0; n < SampleCount; n++) {
if (isnan(in_lev)) {
float lev = fabsf(in[n]);
if (lev > level)
level = lev;
else
level = lev * 0.05f + level * 0.95f;
} else {
level = in_lev;
}
switch (mode) {
case 0:
@ -2964,7 +2975,7 @@ static void noisegate_run(void * Instance, unsigned long SampleCount)
if (gate >= 1.0f) {
gate = 1.0f;
mode = 2;
hold = impl->port[5][0] * impl->rate;
hold = impl->port[6][0] * impl->rate;
}
break;
case 2:

4
src/modules/module-filter-chain.c
View file

@ -630,6 +630,10 @@ extern struct spa_handle_factory spa_filter_graph_factory;
* It has an "In" input port and an "Out" output data ports. Normally the input
* data is passed directly to the output.
*
* The "Level" control port can be used to control the measured volume of the "In"
* port. When not connected, a simple volume algorithm on the "In" port will be
* used.
*
* If the volume drops below "Close threshold", the noisegate will ramp down the
* volume to zero for a duration of "Release (s)" seconds. When the volume is above
* "Open threshold", the noisegate will ramp up the volume to 1 for a duration