Enable the viewfinder event.
camera_error_t camera_enable_viewfinder_event(camera_handle_t handle, camera_eventmode_t eventmode, camera_eventkey_t *key, struct sigevent *event)
The handle returned by a call to the camera_open() function.
The event buffering mode.
A pointer to a camera_eventkey_t. This argument it is required for future function calls to identify the proper event.
A pointer to a sigevent. The sigevent must be initialized by the caller. This sigevent will be sent back to the user when the event occurs.
Use this function to enable the viewfinder event, which is signalled when a raw viewfinder buffer is available. The viewfinder is rendered to a screen window by the camera service. It is not required to add display code unless custom output is required using some other mechanism. Call this function when configuring the Camera API for event mode instead of callback mode.
CAMERA_OK when the function successfully completes, otherwise another camera_error_t value that provides the reason that the call failed.