From ba74a824658f7f59add288d28006ff48bf46b963 Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Mon, 3 Feb 2020 00:29:09 -0800 Subject: libs/sig: introduce a signal generator abstraction This adds a small framework of sorts for creating and composing signal generators. Two generators are implemented at this time; sig_ops_sin and sig_ops_mult sig_ops_sin accepts a hz variable and will produce a sine wave of that frequency. sig_ops_mult accepts two sig_t generators and multiplies their outputs Callers may construct their own sig_ops_t ops structs and supply them to sig_new(), but it's expected that libs/sig will grow a collection of commonly used generators which can then be used by simply passing their sig_ops_$foo to sig_new(). See the test code at the bottom of libs/sig/sig.c for some contrived sample usage. Note by composing multiple sig_ops_sin generators with a sig_ops_mult generator, one can already easily construct a synth-like LFO generator. Some obvious todos are to add triangle/sawtooth/square wave generators. More compositional generators may be interesting as well, like additive and subtractive for example. Those will need to implement clipping, as it's expected that the generators *always* stay within unity (0-1). No modules use this yet, but I expect to wire this up to rtv for driving knobs. --- configure.ac | 1 + 1 file changed, 1 insertion(+) (limited to 'configure.ac') diff --git a/configure.ac b/configure.ac index 4d562b5..3fb6e1f 100644 --- a/configure.ac +++ b/configure.ac @@ -40,6 +40,7 @@ AC_CONFIG_FILES([ src/libs/din/Makefile src/libs/puddle/Makefile src/libs/ray/Makefile + src/libs/sig/Makefile src/libs/txt/Makefile src/modules/Makefile src/modules/drizzle/Makefile -- cgit v1.2.3