The mediasrcbin plugin is designed to simplify the usage of live video capture devices in this design, otherwise the user must take care of initialization and configuration. The plugin is a bin element that includes the standard v4l2src GStreamer element. It configures the media pipelines of the supported video sources in this design.
The v4l2src element inside the
mediasrcbin element interfaces with the V4L2 Linux
framework and the Xilinx VIPP driver through the video device node. The mediasrcbin
element interfaces with the Media Controller Linux
framework through the v412-subdev and media device nodes which allows you to configure the
media pipeline and its sub-devices. It uses the libmediactl and libv4l2subdev
libraries which provide the following functionality:
- Enumerate entities, pads and links
- Configure sub-devices
- Set media bus format
- Set dimensions (width/height)
- Set frame rate
- Export sub-device controls
The mediasrcbin plugin sets the media bus format and resolution on each sub-device source and sink pad for the entire media pipeline. The formats between pads that are connected through links need to match. Refer to the Media Framework section for more information on entities, pads and links.