Hi guys. I'm just becoming familiar with the v4l api programming, so I'm working through the docs @ linuxtv.org. I have the first example which is just tuning the adapter, and it compiles ok but runtime error of invalid argument pops up. I have obviously changed some of the settings like freq and such to suit the channels locally.
So I've spent the past few hours scratching my head over what the issue could be. Any advice on troubleshooting this?
Never mind. Got it... needed more info in the dtv_delivery_system types - wasn't entirely clear on it
hverkuil: posciak in vb2_internal_streamon() I am not sure, but may have an issue
http://lxr.free-electrons.com/source/drivers/media/v4l2-core/videobuf2-core.c#L2276
if q->queued_count < q->min_buffers_needed then q->streaming will be set to one, and streaming considered started
Or did I miss something ?
I have the issue here, where I have 12 buffers (q->num_buffers = 12), 2 as the minimum, and q->queued_count is 0
if q->streaming is 1 and it is not started yet it will wait until you have min_buffers_needed and then start streaming
larsc: I can't find where it is waiting
jmleo: it's not waiting, it's just when you enqueue a new buffer it will check if it should start now
larsc: ok, in qbuf
hi , i am having difficulties building the v4l package
   ret = get_user_pages_locked(current, mm, start, nr_frames,
   ^
cc1: some warnings being treated as errors
scripts/Makefile.build:263: recipe for target '/opt/media_build/v4l/frame_vector.o' failed
make[3]: *** [/opt/media_build/v4l/frame_vector.o] Error 1
Makefile:1395: recipe for target '_module_/opt/media_build/v4l' failed
make[2]: *** [_module_/opt/media_build/v4l] Error 2
make[2]: Leaving directory '/usr/src/linux-headers-3.19.0-28-generic'
Makefile:51: recipe for target 'default' failed
make[1]: *** [default] Error 2
make[1]: Leaving directory '/opt/media_build/v4l'
Makefile:26: recipe for target 'all' failed
make: *** [all] Error 2
build failed at ./build line 491.