start building out audio and rtp libraries

gst/audio/c_util.go

@@ -0,0 +1,38 @@
+package audio
+
+/*
+#include "gst.go.h"
+
+GstClockTime
+framesToClockTime (gint frames, gint rate) { return GST_FRAMES_TO_CLOCK_TIME(frames, rate); }
+
+gint
+clockTimeToFrames(GstClockTime ct, gint rate) { return GST_CLOCK_TIME_TO_FRAMES(ct, rate); }
+*/
+import "C"
+import "time"
+
+// FramesToDuration calculates the Clocktime (which is usually referred to as a time.Duration in the bindings)
+// from the given frames and rate.
+func FramesToDuration(frames, rate int) time.Duration {
+	ct := C.framesToClockTime(C.gint(frames), C.gint(rate))
+	return time.Duration(ct)
+}
+
+// DurationToFrames calculates the number of frames from the given duration and sample rate.
+func DurationToFrames(dur time.Duration, rate int) int {
+	return int(C.clockTimeToFrames(C.GstClockTime(dur.Nanoseconds()), C.gint(rate)))
+}
+
+// gboolean converts a go bool to a C.gboolean.
+func gboolean(b bool) C.gboolean {
+	if b {
+		return C.gboolean(1)
+	}
+	return C.gboolean(0)
+}
+
+// gobool provides an easy type conversion between C.gboolean and a go bool.
+func gobool(b C.gboolean) bool {
+	return int(b) > 0
+}