| .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
| |
| .. _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 |
| ext-ctrls-camera |
| ext-ctrls-flash |
| ext-ctrls-image-source |
| ext-ctrls-image-process |
| ext-ctrls-codec |
| ext-ctrls-jpeg |
| ext-ctrls-dv |
| ext-ctrls-rf-tuner |
| ext-ctrls-fm-tx |
| ext-ctrls-fm-rx |
| ext-ctrls-detect |
| fourcc |
| format |
| planar-apis |
| selection-api |
| crop |
| streaming-par |
