Re: libv4l2 library problem

[Hans de Goede <j.w.r.degoede@hhs.nl>]

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