Overview

This repository contains the recipes necessary to build the v4l-gst libv4l plugin and the integration module to access it from Chromium.

The plugin can be used to connect the Chromium hardware video decode acceleration framework to GStreamer through the V4L2 API.

This recipe supports optional integration with Chromium 40, which requires the meta-browser layer to be included in your yocto configuration.

Building

Add the following packages to your IMAGE_INSTALL_append variable in your local.conf

• v4l-gst
• v4l-gst-bufferpool-rel
• gstreamer1.0-plugins-base-app
• libv4l

Configuration

Create the settings file /etc/xdg/libv4l-gst.conf. The following settings are for the Renesas Porter board, but they may be updated to use more generic settings.

[libv4l-gst]
pipeline=h264parse ! omxh264dec ! queue max-size-bytes=0 max-size-time=0 max-size-buffers=0 ! vspfilter
bufferpool-library=/usr/lib/libv4l/plugins/v4l-gst-bufferpool/libv4l-gst-bufferpool-rel.so
min-buffers=2

Running

Create a dummy V4L2 device file under /dev

# touch /dev/video-gst
# chmod 666 /dev/video-gst

Accessing the /dev/video-gst file will allow an application to use the v4l-gst plugin using the same API as a regular V4L2 device file.

Running with Chromium

Hardware video decoding is blacklisted by default on Chromium. Add the --ignore-gpu-blacklist flag to the Chromium command line to enable video decoding via the V4L2 interface.