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filter-graph: add feedback and feedforward to delay

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Add feedback and feedforward controls to the delay. This makes it
possible to make comb and allpass filters with the delay to build
custom reverb effects.
This commit is contained in:
Wim Taymans 2025-11-28 17:10:55 +01:00
parent 933ac4be43
commit 52ec847cbd
6 changed files with 104 additions and 37 deletions
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13
src/modules/module-filter-chain.c
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@ -420,11 +420,12 @@ extern struct spa_handle_factory spa_filter_graph_factory;
*
* ### Delay
*
* The delay can be used to delay a signal in time.
* The delay can be used to delay a signal in time. With the Feedback and Feedforward
* controls it can also be used as a comb and an allpass filter.
*
* The delay has an input port "In" and an output port "Out". It also has
* a "Delay (s)" control port. It requires a config section in the node declaration
* in this format:
* a "Delay (s)" control port and a "Feedback" and "Feedforward" port. It requires a
* config section in the node declaration in this format:
*
*\code{.unparsed}
* filter.graph = {
@ -439,6 +440,8 @@ extern struct spa_handle_factory spa_filter_graph_factory;
* }
* control = {
* "Delay (s)" = ...
* "Feedback" = ...
* "Feedforward" = ...
* }
* ...
* }
@ -452,6 +455,10 @@ extern struct spa_handle_factory spa_filter_graph_factory;
* - `latency` the latency in seconds. This is 0 by default but in some cases
* the delay can be used to introduce latency with this option.
*
* With the "Feedback" port one can create a comb filter. With the "Feedback"
* port and "Feedforward" port set to A and -A respectively, one can create
* an allpass filter. These settings can be used to create custom reverb units.
*
* ### Invert
*
* The invert plugin can be used to invert the phase of the signal.