Avdevice.Dev_to_appDevice to application communication
type message = | None| Create_window_buffer of (int * int * int * int) option| Prepare_window_buffer| Display_window_buffer| Destroy_window_buffer| Buffer_overflow| Buffer_underflow| Buffer_readable of Stdlib.Int64.t option| Buffer_writable of Stdlib.Int64.t option| Mute_state_changed of bool| Volume_level_changed of floatDevice to application control messages
val set_control_message_callback :
(message -> unit) ->
_ Avutil.container ->
unitAvdevice.Dev_to_app.set_control_message_callback callback device set the callback for device message reception.