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filter-graph: add a zeroramp plugin

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The filter detects unnatural gaps (consisting of 0.0 values) and will
ramp-down or ramp-up the volume when entering/leaving those gaps.

This makes it filter out the pops and clicks you typically get when
pausing and resuming a stream.

See #4745
This commit is contained in:
Wim Taymans 2025-06-17 09:14:18 +02:00
parent 75b4c3379d
commit 0b2b723a0e
2 changed files with 116 additions and 0 deletions
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98
spa/plugins/filter-graph/builtin_plugin.c
View file

@ -56,6 +56,10 @@ struct builtin {
float b0, b1, b2;
float a0, a1, a2;
float accum;
int mode;
uint32_t count;
float last;
};
static void *builtin_instantiate(const struct spa_fga_plugin *plugin, const struct spa_fga_descriptor * Descriptor,
@ -2776,6 +2780,98 @@ static const struct spa_fga_descriptor pipe_desc = {
.cleanup = pipe_cleanup,
};
/* zeroramp */
static struct spa_fga_port zeroramp_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 = "Gap (s)",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.000666f, .min = 0.0f, .max = 1.0f
},
{ .index = 3,
.name = "Duration (s)",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_CONTROL,
.def = 0.000666f, .min = 0.0f, .max = 1.0f
},
};
static void zeroramp_run(void * Instance, unsigned long SampleCount)
{
struct builtin *impl = Instance;
float *in = impl->port[0];
float *out = impl->port[1];
uint32_t n, i, c;
uint32_t gap = (uint32_t)(impl->port[2][0] * impl->rate);
uint32_t duration = (uint32_t)(impl->port[3][0] * impl->rate);
if (out == NULL)
return;
if (in != NULL) {
for (n = 0; n < SampleCount; n++) {
if (impl->mode == 0) {
/* normal mode, finding gaps */
out[n] = in[n];
if (in[n] == 0.0) {
if (++impl->count == gap) {
/* we found gap zeroes, fade out last
* sample and go into zero mode */
for (c = 1, i = n; c < duration && i > 0; i--, c++)
out[i-1] = impl->last *
(0.5f + 0.5f * cosf(M_PIf + M_PIf * c / duration));
impl->mode = 1;
}
} else {
/* keep last sample to fade out when needed */
impl->count = 0;
impl->last = in[n];
}
}
if (impl->mode == 1) {
/* zero mode */
if (in[n] != 0.0f) {
/* gap ended, move to fade-in mode */
impl->mode = 2;
impl->count = 0;
} else {
out[n] = 0.0f;
}
}
if (impl->mode == 2) {
/* fade-in mode */
out[n] = in[n] * (0.5f + 0.5f * cosf(M_PIf + (M_PIf * ++impl->count / duration)));
if (impl->count == duration) {
/* fade in complete, back to normal mode */
impl->count = 0;
impl->mode = 0;
}
}
}
} else {
memset(out, 0, SampleCount * sizeof(float));
}
}
static const struct spa_fga_descriptor zeroramp_desc = {
.name = "zeroramp",
.flags = SPA_FGA_DESCRIPTOR_SUPPORTS_NULL_DATA,
.n_ports = SPA_N_ELEMENTS(zeroramp_ports),
.ports = zeroramp_ports,
.instantiate = builtin_instantiate,
.connect_port = builtin_connect_port,
.run = zeroramp_run,
.cleanup = builtin_cleanup,
};
static const struct spa_fga_descriptor * builtin_descriptor(unsigned long Index)
{
switch(Index) {
@ -2837,6 +2933,8 @@ static const struct spa_fga_descriptor * builtin_descriptor(unsigned long Index)
return &debug_desc;
case 28:
return &pipe_desc;
case 29:
return &zeroramp_desc;
}
return NULL;
}