Hans Verkuil wrote:
Hi Hans,
On Friday 13 February 2009 13:57:45 Hans Verkuil wrote:
Hi Hans,
I've developed a converter for the HM12 format (produced by Conexant MPEG
encoders as used in the ivtv and cx18 drivers).
But libv4l2 has a problem in its implementation of v4l2_read: it assumes
that the driver can always do streaming. However, that is not the case
for some drivers, including cx18 and ivtv. These drivers only implement
read() functionality and no streaming.
Can you as a minimum modify libv4l2 so that it will check for this case?
The best solution would be that libv4l2 can read HM12 from the driver and
convert it on the fly. But currently it tries to convert HM12 by starting
to stream, and that produces an error.
This bug needs to be fixed first before I can contribute my HM12
converter.
My sincere apologies: I looked at the libv4l2 code again and it was clear
that it did in fact test for this case. I retested my own code and
everything seems to work as it should. So libv4l2 is fine, and I will
prepare a tree tomorrow containing the hm12 support for libv4lconvert.
Ok,
Sorry about this,
No problem I didn't have time to look in to this yet :)
Regards,
Hans
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