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filter-chain: add abs plugin

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To calculate the absolute value of the signal.
This commit is contained in:
Niklas Carlsson 2024-12-06 12:15:25 +01:00 • committed by Wim Taymans
parent 7785f61677
commit d7718dbcb7
2 changed files with 46 additions and 0 deletions
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40
spa/plugins/filter-graph/builtin_plugin.c
View file

@ -2367,6 +2367,44 @@ static const struct spa_fga_descriptor ramp_desc = {
.cleanup = builtin_cleanup,
};
/* abs */
static void abs_run(void * Instance, unsigned long SampleCount)
{
struct builtin *impl = Instance;
float *in = impl->port[1], *out = impl->port[0];
if (in != NULL && out != NULL) {
unsigned long n;
for (n = 0; n < SampleCount; n++) {
out[n] = SPA_ABS(in[n]);
}
}
}
static struct spa_fga_port abs_ports[] = {
{ .index = 0,
.name = "Out",
.flags = SPA_FGA_PORT_OUTPUT | SPA_FGA_PORT_AUDIO,
},
{ .index = 1,
.name = "In",
.flags = SPA_FGA_PORT_INPUT | SPA_FGA_PORT_AUDIO,
},
};
static const struct spa_fga_descriptor abs_desc = {
.name = "abs",
.flags = SPA_FGA_DESCRIPTOR_SUPPORTS_NULL_DATA,
.n_ports = SPA_N_ELEMENTS(abs_ports),
.ports = abs_ports,
.instantiate = builtin_instantiate,
.connect_port = builtin_connect_port,
.run = abs_run,
.cleanup = builtin_cleanup,
};
static const struct spa_fga_descriptor * builtin_descriptor(unsigned long Index)
{
switch(Index) {
@ -2420,6 +2458,8 @@ static const struct spa_fga_descriptor * builtin_descriptor(unsigned long Index)
return &dcblock_desc;
case 24:
return &ramp_desc;
case 25:
return &abs_desc;
}
return NULL;
}

6
src/modules/module-filter-chain.c
View file

@ -427,6 +427,12 @@ extern struct spa_handle_factory spa_filter_graph_factory;
* It has an input port "In" and an output port "Out". It also has a "Control"
* and "Notify" port for the control values.
*
* ### Abs
*
* The abs plugin can be used to calculate the absolute value of samples.
*
* It has an input port "In" and an output port "Out".
*
* ### Exp
*
* The exp plugin can be used to calculate the exponential (base^x) of samples