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authorVito Caputo <vcaputo@pengaru.com>2020-02-03 04:06:30 -0800
committerVito Caputo <vcaputo@pengaru.com>2020-02-03 04:06:30 -0800
commitd583e88bf3372e23afe7c52510b19aeffcdc32fa (patch)
treec9122c1240998c2832a6fc7ae5175b2a7c13b3dd /src/libs
parentba74a824658f7f59add288d28006ff48bf46b963 (diff)
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.
Diffstat (limited to 'src/libs')
-rw-r--r--src/libs/sig/Makefile.am2
-rw-r--r--src/libs/sig/ops_const.c43
-rw-r--r--src/libs/sig/sig.h1
3 files changed, 45 insertions, 1 deletions
diff --git a/src/libs/sig/Makefile.am b/src/libs/sig/Makefile.am
index 4787b5a..4c41f41 100644
--- a/src/libs/sig/Makefile.am
+++ b/src/libs/sig/Makefile.am
@@ -1,3 +1,3 @@
noinst_LIBRARIES = libsig.a
-libsig_a_SOURCES = ops_mult.c ops_sin.c sig.c sig.h
+libsig_a_SOURCES = ops_const.c ops_mult.c ops_sin.c sig.c sig.h
libsig_a_CPPFLAGS = -I@top_srcdir@/src
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 <assert.h>
+#include <math.h>
+
+#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,
+};
+
diff --git a/src/libs/sig/sig.h b/src/libs/sig/sig.h
index cd22d4d..f377f00 100644
--- a/src/libs/sig/sig.h
+++ b/src/libs/sig/sig.h
@@ -17,6 +17,7 @@ sig_t * sig_new(const sig_ops_t *ops, ...);
sig_t * sig_free(sig_t *sig);
float sig_output(sig_t *sig, unsigned ticks_ms);
+extern sig_ops_t sig_ops_const;
extern sig_ops_t sig_ops_sin;
/* TODO:
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