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

["Xiang, Haihao" <haihao.xiang-at-intel.com@ffmpeg.org>]

From: Haihao Xiang <haihao.xiang@intel.com>

Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
---
 doc/ffmpeg.texi | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index c6c0606e8a..2c04b22cf3 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -1385,6 +1385,29 @@ If not specified, it will attempt to open the default X11 display (@emph{$DISPLA
 and then the first DRM render node (@emph{/dev/dri/renderD128}), or the default
 DirectX adapter on Windows.
 
+The following options are recognized:
+@table @option
+@item kernel_driver
+When @var{device} is not specified, use this option to specify the name of the kernel
+driver associated with the desired device. This option is only available when
+@emph{libdrm} works on Linux.
+@end table
+
+Examples:
+@table @emph
+@item -init_hw_device vaapi
+Create a vaapi device on the default device
+
+@item -init_hw_device vaapi:/dev/dri/renderD129
+Create a vaapi device on DRM render node /dev/dri/renderD129
+
+@item -init_hw_device vaapi:1
+Create a vaapi device on DirectX adapter 1
+
+@item -init_hw_device vaapi:,kernel_driver=i915
+Create a vaapi device on a device associated with kernel driver @samp{i915}
+@end table
+
 @item vdpau
 @var{device} is an X11 display name.
 If not specified, it will attempt to open the default X11 display (@emph{$DISPLAY}).
-- 
2.34.1

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