The Video4Linux2 API: an introduction - complimentary information
Posted Oct 20, 2006 12:55 UTC (Fri) by mchehab
Parent article: The Video4Linux2 API: an introduction
> There are also the "teletext" and "radio data system" interfaces currently implemented in the older V4L1 API; those have not been moved to V4L2 and there do not appear to be any immediate plans to do so.
In fact, VBI interface handles both Closed Captions and Teletext. So, there's no need to have a separated teletext support.
At the raw VBI, the decoding proccess of Teletext is handled by userspace, while, with sliced VBI, this work is done by the hardware.
For Radio Data System, V4L2 uses a different approach, by using some special ioctls to haldle it, defined on include/media/rds.h.
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