gboolean gst_v4l2_decoder_set_sink_fmt (GstV4l2Decoder * self, guint32 fmt,
gint width, gint height);
+GstCaps * gst_v4l2_decoder_enum_src_formats (GstV4l2Decoder * self);
+
gboolean gst_v4l2_decoder_select_src_format (GstV4l2Decoder * self,
+ GstCaps * caps,
GstVideoInfo * info);
gint gst_v4l2_decoder_request_buffers (GstV4l2Decoder * self,