Re: [FFmpeg-devel] [PATCH 1/2] doc/ffmpeg: update the documentation about qsv device creation

[Dennis Mungai <dmngaie@gmail.com>]

On Tue, 2 Jan 2024, 08:27 Xiang, Haihao, <
haihao.xiang-at-intel.com@ffmpeg.org> wrote:

> On Vr, 2023-12-29 at 12:23 +0800, Xiang, Haihao wrote:
> > From: Haihao Xiang <haihao.xiang@intel.com>
> >
> > Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
> > ---
> >  doc/ffmpeg.texi | 21 +++++++++++++++++++--
> >  1 file changed, 19 insertions(+), 2 deletions(-)
> >
> > diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
> > index ab17d1d687..c6c0606e8a 100644
> > --- a/doc/ffmpeg.texi
> > +++ b/doc/ffmpeg.texi
> > @@ -1406,16 +1406,33 @@ If not specified, @samp{auto_any} is used.
> >  platform-appropriate subdevice (@samp{dxva2} or @samp{d3d11va} or
> > @samp{vaapi}) and then deriving a
> >  QSV device from that.)
> >
> > -Alternatively, @samp{child_device_type} helps to choose
> platform-appropriate
> > subdevice type.
> > -On Windows @samp{d3d11va} is used as default subdevice type.
> > +The following options are recognized:
> > +@table @option
> > +@item child_device
> > +Specify a DRM render node on Linux or DirectX adapter on Windows
> > +@item child_device_type
> > +Choose platform-appropriate subdevice type. On Windows @samp{d3d11va}
> is used
> > +as default subdevice type.
> > +@end table
> >
> >  Examples:
> >  @table @emph
> > +@item -init_hw_device qsv:hw,child_device=/dev/dri/renderD129
> > +Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DRM render node
> > /dev/dri/renderD129
> > +
> > +@item -init_hw_device qsv:hw,child_device=1
> > +Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DirectX adapter 1.
> The
> > subdevice
> > +type is @samp{d3d11va} if @code{--enable-libvpl} is specified at
> > configuration time, the
> > +subdevice type is @samp{dxva2} if @code{--enable-libmfx} is specified at
> > configuration time.
> > +
> >  @item -init_hw_device qsv:hw,child_device_type=d3d11va
> >  Choose the GPU subdevice with type @samp{d3d11va} and create QSV device
> with
> > @samp{MFX_IMPL_HARDWARE}.
> >
> >  @item -init_hw_device qsv:hw,child_device_type=dxva2
> >  Choose the GPU subdevice with type @samp{dxva2} and create QSV device
> with
> > @samp{MFX_IMPL_HARDWARE}.
> > +
> > +@item -init_hw_device qsv:hw,child_device=1,child_device_type=d3d11va
> > +Create a QSV device with @samp{MFX_IMPL_HARDWARE} on DirectX adapter 1
> with
> > subdevice type @samp{d3d11va}
> >  @end table
> >
> >  @item opencl
>
> Will apply the patchset
>


A small request: The docs mention the creation of either VAAPI or d3d11
devices and then deriving a Quicksync device from that. Can your patchset
include a trivial example of that, preferably with hwmap? That would
eliminate the ambiguity in that clause.

>
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