i'm working on a project for legacy support of a teletext server with
composite output interface.
i supposed to "ingest" teletext using the /dev/vbi support on linux so
i've got an Easycap dongle
Bus 001 Device 008: ID 05e1:0408 Syntek Semiconductor Co., Ltd STK1160
Video Capture Device
AFAIK (i didn't open) it's using a video decoder SC7113 supposed to be a
clone of SAA7113.
this device is supposed to work on an Ubuntu 12.04 with old kernel 3.2
so i had to blacklist the stock "RE" kernel module easycap and install
the "retrofit" from here:
https://github.com/ezequielgarcia/stk1160-standalone
i see the saa7115 is loaded and i can also see audio and video through
mplayer..
$ lsmod
Module Size Used by
saa7115 18447 1
stk1160 27732 0
videobuf2_core 28148 1 stk1160
snd_ac97_codec 110213 1 stk1160
....
but in the dev fs there's no sign of /dev/vbi interface..
so my questions are:
- are these SAA7113 clones really copycat with all the features supported?
- has the SAA711x driver ever been used for /dev/vbi feature? i used to
work with Bt878 cards for that feature.
- is the stock 3.x mainline kernel of the stk1160 really
improved/different/VBI enabled?
- is there a way to extract VBI lines on /dev/video0?
- is there an easy way to enable or at least test (directly on the USB
interface) the VBI interface?
- finally which approach do you suggest for supporting this ancient
feature, if feasibiliy tests are ok:
- a libusb quick hack?
- an implementation of the bindings between user level /dev/vbi and
underlying SAA711x routines?
bests
andrea venturi
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