add tagsetter and tocsetter interfaces

gst/gst_toc_setter.go

@@ -0,0 +1,34 @@
+package gst
+
+// #include "gst.go.h"
+import "C"
+
+// TOCSetter is an interface that elements can implement to provide TOC writing capabilities.
+type TOCSetter interface {
+	// Return current TOC the setter uses. The TOC should not be modified without making it writable first.
+	GetTOC() *TOC
+	// Set the given TOC on the setter. Previously set TOC will be unreffed before setting a new one.
+	SetTOC(*TOC)
+	// Reset the internal TOC. Elements should call this from within the state-change handler.
+	Reset()
+}
+
+// gstTocSetter implements a TOCSetter that is backed by an Element from the C runtime.
+type gstTOCSetter struct {
+	ptr *C.GstElement
+}
+
+func (g *gstTOCSetter) Instance() *C.GstTocSetter {
+	return C.toTocSetter(g.ptr)
+}
+
+func (g *gstTOCSetter) GetTOC() *TOC {
+	toc := C.gst_toc_setter_get_toc(g.Instance())
+	if toc == nil {
+		return nil
+	}
+	return wrapTOC(toc)
+}
+
+func (g *gstTOCSetter) SetTOC(toc *TOC) { C.gst_toc_setter_set_toc(g.Instance(), toc.Instance()) }
+func (g *gstTOCSetter) Reset()          { C.gst_toc_setter_reset(g.Instance()) }