| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | .. -*- coding: utf-8; mode: rst -*- |
| 2 | |
| 3 | .. _common: |
| 4 | |
| 5 | ################### |
| 6 | Common API Elements |
| 7 | ################### |
| 8 | Programming a V4L2 device consists of these steps: |
| 9 | |
| 10 | - Opening the device |
| 11 | |
| 12 | - Changing device properties, selecting a video and audio input, video |
| 13 | standard, picture brightness a. o. |
| 14 | |
| 15 | - Negotiating a data format |
| 16 | |
| 17 | - Negotiating an input/output method |
| 18 | |
| 19 | - The actual input/output loop |
| 20 | |
| 21 | - Closing the device |
| 22 | |
| 23 | In practice most steps are optional and can be executed out of order. It |
| 24 | depends on the V4L2 device type, you can read about the details in |
| 25 | :ref:`devices`. In this chapter we will discuss the basic concepts |
| 26 | applicable to all devices. |
| 27 | |
| 28 | |
| 29 | .. toctree:: |
| 30 | :maxdepth: 1 |
| 31 | |
| 32 | open |
| 33 | querycap |
| 34 | app-pri |
| 35 | video |
| 36 | audio |
| 37 | tuner |
| 38 | standard |
| 39 | dv-timings |
| 40 | control |
| 41 | extended-controls |
| 42 | format |
| 43 | planar-apis |
| 44 | selection-api |
| 45 | crop |
| 46 | streaming-par |