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filter-graph: add a simple noise gate

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This commit is contained in:
Wim Taymans 2025-07-03 12:38:05 +02:00
parent 616db9809e
commit ef5d9ff028
2 changed files with 148 additions and 0 deletions
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135
spa/plugins/filter-graph/builtin_plugin.c
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@ -60,6 +60,9 @@ struct builtin {
int mode;
uint32_t count;
float last;
float gate;
float hold;
};
static void *builtin_instantiate(const struct spa_fga_plugin *plugin, const struct spa_fga_descriptor * Descriptor,
@ -2876,6 +2879,136 @@ static const struct spa_fga_descriptor zeroramp_desc = {
.cleanup = builtin_cleanup,
};
/* noisegate */
static struct spa_fga_port noisegate_ports[] = {
{ .index = 0,
.name = "In",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_AUDIO,
},
{ .index = 1,
.name = "Out",
.flags = SPA_FGA_PORT_OUTPUT | SPA_FGA_PORT_AUDIO,
},
{ .index = 2,
.name = "Open Threshold",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.004f, .min = 0.0f, .max = 1.0f
},
{ .index = 3,
.name = "Close Threshold",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.003f, .min = 0.0f, .max = 1.0f
},
{ .index = 4,
.name = "Attack (s)",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.005f, .min = 0.0f, .max = 1.0f
},
{ .index = 5,
.name = "Hold (s)",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.050f, .min = 0.0f, .max = 1.0f
},
{ .index = 6,
.name = "Release (s)",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.010f, .min = 0.0f, .max = 1.0f
},
};
static void noisegate_run(void * Instance, unsigned long SampleCount)
{
struct builtin *impl = Instance;
float *in = impl->port[0];
float *out = impl->port[1];
unsigned long n;
float o_thres = impl->port[2][0];
float c_thres = impl->port[3][0];
float gate, hold, o_rate, c_rate, level;
int mode;
if (out == NULL)
return;
if (in == NULL) {
memset(out, 0, SampleCount * sizeof(float));
return;
}
o_rate = 1.0f / (impl->port[4][0] * impl->rate);
c_rate = 1.0f / (impl->port[6][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]);
if (lev > level)
level = lev;
else
level = lev * 0.05f + level * 0.95f;
switch (mode) {
case 0:
/* closed */
if (level >= o_thres)
mode = 1;
break;
case 1:
/* opening */
gate += o_rate;
if (gate >= 1.0f) {
gate = 1.0f;
mode = 2;
hold = impl->port[5][0] * impl->rate;
}
break;
case 2:
/* hold */
hold -= 1.0f;
if (hold <= 0.0f)
mode = 3;
break;
case 3:
/* open */
if (level < c_thres)
mode = 4;
break;
case 4:
/* closing */
gate -= c_rate;
if (level >= o_thres)
mode = 1;
else if (gate <= 0.0f) {
gate = 0.0f;
mode = 0;
}
break;
}
out[n] = in[n] * gate;
}
impl->gate = gate;
impl->hold = hold;
impl->mode = mode;
impl->last = level;
}
static const struct spa_fga_descriptor noisegate_desc = {
.name = "noisegate",
.flags = SPA_FGA_DESCRIPTOR_SUPPORTS_NULL_DATA,
.n_ports = SPA_N_ELEMENTS(noisegate_ports),
.ports = noisegate_ports,
.instantiate = builtin_instantiate,
.connect_port = builtin_connect_port,
.run = noisegate_run,
.cleanup = builtin_cleanup,
};
static const struct spa_fga_descriptor * builtin_descriptor(unsigned long Index)
{
switch(Index) {
@ -2939,6 +3072,8 @@ static const struct spa_fga_descriptor * builtin_descriptor(unsigned long Index)
return &pipe_desc;
case 29:
return &zeroramp_desc;
case 30:
return &noisegate_desc;
}
return NULL;
}