make audio meta use glib's transfer none

gst/audio/gst_audio_meta.go

@@ -8,29 +8,32 @@ import "C"
 import (
 	"unsafe"
 
+	"github.com/tinyzimmer/go-glib/glib"
 	"github.com/go-gst/go-gst/gst"
 )
 
-type AudioMeta struct {
-	ptr *C.GstAudioMeta
+// AudioMeta is a Go representation of a GstAudioMeta.
+type AudioMeta struct{ *Object }
+
+// FromGstAudioMetaUnsafeNone wraps the given audioMeta with a ref and finalizer.
+func FromGstAudioMetaUnsafeNone(audioMeta unsafe.Pointer) *AudioMeta {
+	return &AudioMeta{wrapObject(glib.TransferNone(audioMeta))}
 }
 
-func wrapMetaFull(ptr *C.GstAudioMeta) *AudioMeta {
-	meta := &AudioMeta{ptr}
-	return meta
-}
+func BufferAddAudioMeta(buffer *gst.Buffer, info *Info, samples int, offsets []int) *AudioMeta {
+	// offsets is not yet implemented, always pass `nil` or this will panic
+	if offsets != nil {
+		panic("offsets is not implemented")
+	}
 
-func BufferAddAudioMeta(buffer *gst.Buffer, info *Info, samples int /*, offsets *[]int*/) *AudioMeta {
-	/*gSizeOffsets := C.gsize(unsafe.Sizeof(unsafe.Pointer(offsets)))*/
+	// gSizeOffsets := C.gsize(unsafe.Sizeof(unsafe.Pointer(offsets)))
 	// if you pass in NULL as the last param then gstreamer assumes things are tightly packed...
-	// and they are for me so this makes things work... but obviously would be nice for it to work
-	// properly
+	// so that's what we currently assume until we inplement offsets
 
-	return wrapMetaFull(C.gst_buffer_add_audio_meta(
+	return FromGstAudioMetaUnsafeNone(unsafe.Pointer(C.gst_buffer_add_audio_meta(
 		(*C.GstBuffer)(unsafe.Pointer(buffer.Instance())),
 		info.ptr,
 		C.gsize(samples),
-		/*&gSizeOffsets,*/
-		nil,
-	))
+		offsets,
+	))))
 }