OpenIoT & ELC 2016

While the V4L2 API offers a great deal of control over video devices, it so far provides no way to reconfigure a video pipeline atomically, leaving important use cases open to race conditions or expensive stop-reconfigure-restart cycles.

The problem is being addressed with the development of the Request API as an extension to the Media Controller and V4L2 APIs. Application will be able to prepare a new configuration for the the media device pipeline and apply it in an atomic fashion synchronously or asynchronously.

This talk will explain the design of the Request API and how to use it in both applications and drivers. The focus will be put on two major use cases, 2D hardware composers and Android camera HAL v3 implementation.