Overview

This meta-rcar extension 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, 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
• libv4l
• libv4l-dev

Add the following define to your local.conf

PACKAGECONFIG_append_pn-chromium = " proprietary-codecs"

bitbake as usual.

Configuration

Create the settings file /etc/xdg/libv4l-gst.conf if it doesn't exist. Example settings for an R-Car board are show below, 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
min-buffers=2

Running

Create a dummy V4L2 device file under /dev

# touch /dev/video-gst
# chsmack -a \* /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

Link to the video decoder device file that Chromium uses

# ln -s /dev/video-gst /dev/video-dec
# chsmack -a \* /dev/video-dec

Hardware video decoding is blacklisted by default on Chromium. Add the --ignore-gpu-blacklist (and if necessary --in-process-gpu ) flag(s) to the Chromium command line to enable video decoding via the V4L2 interface.