From d583e88bf3372e23afe7c52510b19aeffcdc32fa Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Mon, 3 Feb 2020 04:06:30 -0800 Subject: libs/sig: intrduce sig_ops_const The simplest of signals: a constant value. The immediate need for this is to convert ops_sin_ctxt_t.hz to another sig_t enabling varying hz with time, while still being able to have a fixed hz as well. --- src/libs/sig/ops_const.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 src/libs/sig/ops_const.c (limited to 'src/libs/sig/ops_const.c') diff --git a/src/libs/sig/ops_const.c b/src/libs/sig/ops_const.c new file mode 100644 index 0000000..aa7e862 --- /dev/null +++ b/src/libs/sig/ops_const.c @@ -0,0 +1,43 @@ +#include +#include + +#include "sig.h" + + +typedef struct ops_const_ctxt_t { + float value; +} ops_const_ctxt_t; + + +static size_t ops_const_size(va_list ap) +{ + return sizeof(ops_const_ctxt_t); +} + + +static void ops_const_init(void *context, va_list ap) +{ + ops_const_ctxt_t *ctxt = context; + + assert(ctxt); + + ctxt->value = va_arg(ap, double); +} + + +static float ops_const_output(void *context, unsigned ticks_ms) +{ + ops_const_ctxt_t *ctxt = context; + + assert(ctxt); + + return ctxt->value; +} + + +sig_ops_t sig_ops_const = { + .size = ops_const_size, + .init = ops_const_init, + .output = ops_const_output, +}; + -- cgit v1.2.3