.. -*- coding: utf-8; mode: rst -*- .. _common: ################### Common API Elements ################### Programming a V4L2 device consists of these steps: - Opening the device - Changing device properties, selecting a video and audio input, video standard, picture brightness a. o. - Negotiating a data format - Negotiating an input/output method - The actual input/output loop - Closing the device In practice most steps are optional and can be executed out of order. It depends on the V4L2 device type, you can read about the details in :ref:`devices`. In this chapter we will discuss the basic concepts applicable to all devices. .. toctree:: :maxdepth: 1 open querycap app-pri video audio tuner standard dv-timings control extended-controls format planar-apis crop selection-api streaming-par