Add gstCaps.GetStructure

caps.go

@@ -43,3 +43,12 @@ func (c *Caps) String() (str string) {
 	str = C.GoString((*C.char)(unsafe.Pointer(CStr)))
 	return
 }
+
+func (c *Caps) GetStructure(index int) (structure *Structure) {
+	Cstructure := C.gst_caps_get_structure(c.caps, C.uint(index))
+	structure = &Structure{
+		C: Cstructure,
+	}
+
+	return
+}

caps_test.go

@@ -0,0 +1,35 @@
+package gst
+
+import "testing"
+
+func TestCaps_GetStructure(t *testing.T) {
+	pipeline, err := ParseLaunch("videotestsrc name=src ! video/x-raw,width=640,height=480 ! fakesink")
+	if err != nil {
+		t.Fatal(err)
+	}
+	src := pipeline.GetByName("src")
+	if src == nil {
+		t.Fatal("element 'src' not found")
+	}
+	pipeline.SetState(StatePlaying)
+	bus := pipeline.GetBus()
+	for {
+		msg := bus.Pull(MessageStateChanged)
+		_, newState, _ := msg.ParseStateChanged()
+		if newState == StatePlaying {
+			structure := src.GetStaticPad("src").GetCurrentCaps().GetStructure(0)
+			width, err := structure.GetInt("width")
+			if err != nil {
+				t.Fatal(err)
+			}
+			height, err := structure.GetInt("height")
+			if err != nil {
+				t.Fatal(err)
+			}
+			if width != 640 || height != 480 {
+				t.Fatal(err)
+			}
+			break
+		}
+	}
+}