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filter-chain: add linear transform filter

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Transforms samples or control with v * mult + add
This commit is contained in:
Wim Taymans 2023-10-20 20:37:50 +02:00
parent 07696d5d57
commit 8a9a4723f2
2 changed files with 92 additions and 3 deletions
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19
src/modules/module-filter-chain.c
View file

@ -203,8 +203,8 @@ PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
* - `bq_notch` a notch filter.
* - `bq_allpass` an allpass filter.
* - `bq_raw` a raw biquad filter. You need a config section to specify coefficients
* per sample rate. The coefficients of the sample rate closest to the
* graph rate are selected:
* per sample rate. The coefficients of the sample rate closest to the
* graph rate are selected:
*
*\code{.unparsed}
* filter.graph = {
@ -320,6 +320,19 @@ PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
*
* It has an input port "In" and an output port "Out".
*
* ### Linear
*
* The linear plugin can be used to apply a linear transformation on samples
* or control values.
*
* It has an input port "In" and an output port "Out". It also has a "Control"
* and "Notify" port for the control values.
*
* The control value "Mult" and "Add" are used to configure the linear transform. Each
* sample or control value will be calculated as: new = old * Mult + Add.
*
* The final result can be clamped to the "Min" and "Max" control values.
*
* ## SOFA filter
*
* There is an optional builtin SOFA filter available.
@ -391,7 +404,7 @@ PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
* - \ref PW_KEY_NODE_LINK_GROUP
* - \ref PW_KEY_NODE_VIRTUAL
* - \ref PW_KEY_NODE_NAME: See notes below. If not specified, defaults to
* 'filter-chain-<pid>-<module-id>'.
* 'filter-chain-<pid>-<module-id>'.
*
* Stream only properties:
*

76
src/modules/module-filter-chain/builtin_plugin.c
View file

@ -1234,6 +1234,80 @@ static const struct fc_descriptor invert_desc = {
.cleanup = builtin_cleanup,
};
/* linear */
static void linear_run(void * Instance, unsigned long SampleCount)
{
struct builtin *impl = Instance;
float mult = impl->port[4][0], add = impl->port[5][0];
float min = impl->port[6][0], max = impl->port[7][0];
float *in = impl->port[1], *out = impl->port[0];
float *ctrl = impl->port[3], *notify = impl->port[2];
fprintf(stderr, "%f %f %f %f\n", ctrl[0], notify[0], mult, add);
if (in != NULL && out != NULL) {
unsigned long n;
for (n = 0; n < SampleCount; n++)
out[n] = SPA_CLAMPF(in[n] * mult + add, min, max);
}
if (ctrl != NULL && notify != NULL) {
fprintf(stderr, "%f %f %f %f\n", ctrl[0], notify[0], mult, add);
notify[0] = SPA_CLAMPF(ctrl[0] * mult + add, min, max);
}
}
static struct fc_port linear_ports[] = {
{ .index = 0,
.name = "Out",
.flags = FC_PORT_OUTPUT | FC_PORT_AUDIO,
},
{ .index = 1,
.name = "In",
.flags = FC_PORT_INPUT | FC_PORT_AUDIO,
},
{ .index = 2,
.name = "Notify",
.flags = FC_PORT_OUTPUT | FC_PORT_CONTROL,
},
{ .index = 3,
.name = "Control",
.flags = FC_PORT_INPUT | FC_PORT_CONTROL,
},
{ .index = 4,
.name = "Mult",
.flags = FC_PORT_INPUT | FC_PORT_CONTROL,
.def = 1.0f, .min = -10.0f, .max = 10.0f
},
{ .index = 5,
.name = "Add",
.flags = FC_PORT_INPUT | FC_PORT_CONTROL,
.def = 0.0f, .min = -10.0f, .max = 10.0f
},
{ .index = 6,
.name = "Min",
.flags = FC_PORT_INPUT | FC_PORT_CONTROL,
.def = 0.0f, .min = -100.0f, .max = 100.0f
},
{ .index = 7,
.name = "Max",
.flags = FC_PORT_INPUT | FC_PORT_CONTROL,
.def = 1.0f, .min = -100.0f, .max = 100.0f
},
};
static const struct fc_descriptor linear_desc = {
.name = "linear",
.flags = FC_DESCRIPTOR_SUPPORTS_NULL_DATA,
.n_ports = 8,
.ports = linear_ports,
.instantiate = builtin_instantiate,
.connect_port = builtin_connect_port,
.run = linear_run,
.cleanup = builtin_cleanup,
};
static const struct fc_descriptor * builtin_descriptor(unsigned long Index)
{
switch(Index) {
@ -1265,6 +1339,8 @@ static const struct fc_descriptor * builtin_descriptor(unsigned long Index)
return &invert_desc;
case 13:
return &bq_raw_desc;
case 14:
return &linear_desc;
}
return NULL;
}