Add metadata support to Frame (#171)

Author: Tryanks

frame.go

@@ -244,6 +244,20 @@ func (f *Frame) SideData() *FrameSideData {
 	return newFrameSideDataFromC(&f.c.side_data, &f.c.nb_side_data)
 }
 
+// https://ffmpeg.org/doxygen/7.0/structAVFrame.html#a5bde87fd101f66d6263bb451056dba13
+func (f *Frame) Metadata() *Dictionary {
+	return newDictionaryFromC(f.c.metadata)
+}
+
+// https://ffmpeg.org/doxygen/7.0/structAVFrame.html#a5bde87fd101f66d6263bb451056dba13
+func (f *Frame) SetMetadata(d *Dictionary) {
+	if d == nil {
+		f.c.metadata = nil
+	} else {
+		f.c.metadata = d.c
+	}
+}
+
 // https://ffmpeg.org/doxygen/7.0/structAVFrame.html#a1e71ce60cedd5f3b6811714a9f7f9e0a
 func (f *Frame) Width() int {
 	return int(f.c.width)

frame_test.go

@@ -130,4 +130,16 @@ func TestFrame(t *testing.T) {
 	f7b, err := f7.Data().Bytes(align)
 	require.NoError(t, err)
 	require.Equal(t, f6b, f7b)
+
+	f8 := AllocFrame()
+	require.NotNil(t, f8)
+	defer f8.Free()
+	d := NewDictionary()
+	require.NoError(t, d.Set("k", "v", 0))
+	f8.SetMetadata(d)
+	v := f8.Metadata().Get("k", nil, 0)
+	require.NotNil(t, v)
+	require.Equal(t, "v", v.Value())
+	f8.SetMetadata(nil)
+	require.Nil(t, f8.Metadata())
 }