Re: [FFmpeg-devel] [PATCH 1/2] libavcodec: add AV_CODEC_ID_IVTV_VBI

[Marth64 <marth64@proxyid.net>]

Hi Scott,

LGTM.
I will push soon and fix the APIchanges on the way.

Apologies for the delay on this simple patch.
Had a lot of issues getting the machine up and running.

I was able to capture a sample finally and test this out.
I wanted to test it to get an idea of how EIA-608 travels through this stream.
The patch works and detects the discrete ivtv sliced VBI stream correctly.

Based on the V4L2 docs and controls the coded VBI stream can contain
EIA-608, Teletext, WSS (PAL widescreen signaling), or VPS (PAL VCR
signaling).

Even though there is no decoder/further demuxer yet to unwrap this, I
am good with AVMEDIA_TYPE_SUBTITLE since this is effectively like
AV_CODEC_ID_EIA_608 (where EIA608/DTVCC/XDS are clumped together
similarly).

I'm working on a prototype/idea to improve handling of these wrapped
caption formats and will take this one into consideration.

For anyone who wants to try,
```
v4l2-ctl -b cc  -d /dev/vbi0 # set device to capture CC in sliced VBI
v4l2-ctl -B -d /dev/vbi0 # validate above

v4l2-ctl -d /dev/video0 -c stream_vbi_format=1 # tell V4L2 to inject
the sliced VBI as IVTV format
v4l2-ctl -d /dev/video0 -l # validate the above
```
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