Hi Tomasz,
On Mon, Jul 02, 2018 at 04:30:52PM +0900, Tomasz Figa wrote:
> On Mon, Jul 2, 2018 at 4:25 PM Baruch Siach <baruch at tkos.co.il> wrote:
> > On Fri, May 25, 2018 at 05:52:57PM +0800, JeffyChen wrote:
> > > On 05/25/2018 02:10 PM, Tomasz Figa wrote:
> > > > On Thu, May 24, 2018 at 9:18 PM Baruch Siach <baruch at tkos.co.il> wrote:
> > > > > It looks like only v2 supports h.264 encoding. Does the v2 plugin work
> > > > > with the rk3288?
> > > >
> > > > Hmm, looks like I missed the part about h264 in your original message (only
> > > > noticed encoding). We didn't have a need to encode h264 on rk3288 devices.
> > > > The need showed up only later when we were working on rk3399. This made
> > > > both the driver and plugin for rk3288 lack h264 support.
> > > >
> > > > AFAICT the hardware programming interface differs between rk3288 and
> > > > rk3399, so v2 might not work, but maybe you just need to reshuffle some
> > > > registers.
> > > >
> > > > It's also possible that Rockchip has some code for it. Jeffy, do you know
> > > > if there is h264 driver code and plugin for rk3288 available somewhere
> > > > (based on the driver developed for Chrome OS 3.14 kernel)?
> > >
> > > well, i do saw a h264e driver for rk3288 in cros kernel:
> > > chromiumos/src/third_party/kernel/local/drivers/media/platform/rockchip-vpu#
> > > ls rk3288_vpu_hw_h264e.c
> > >
> > > and the related struct defined in v2 plugin:
> > > libv4l-rockchip_v2/libvepu/common/rk_venc.h:120:struct
> > > rk3288_h264e_reg_params {
> >
> > Thanks for the reference.
> >
> > I'm trying to build the v4l plugin stand alone. But in the repo I only see a
> > Makefile.am file. I guess it integrates with the higher level build system of
> > CromiumOS.
> >
> > Do you have any idea how to build this v4l plugin code stand-alone?
>
> It's supposed to be built as a part of v4l-utils
> (http://git.linuxtv.org/v4l-utils.git), which includes libv4l. We
> build it with 1.6.0, but I guess newer versions may work too.
>
> For reference, here's our ebuild (for Gentoo portage) to build it:
> https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/master/media-libs/libv4lplugins/libv4lplugins-9999.ebuild
The rockchip plugin code refers to the 'config_store' field in v4l2_buffer and
v4l2_ext_controls. This requires a special version of videodev2.h that is in
the chromeos-4.4 kernel (featuring commits 3b6d3bc13e572 and 86be552490a2a).
The code of libv4l2 also requires patching since it refers to the 'reserved2'
field of v4l2_buffer since before version 1.6.0.
I could not find these patches in the libv4l2 ebuild[1]. Where can I find
them? Is there some other version of libv4l2 that the rockchip plugin builds
against?
Thanks,
baruch
[1] https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/master/media-libs/libv4l/
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