-----Original Message-----
From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of Haihao Xiang
Sent: Mittwoch, 23. Juni 2021 05:04
To: ffmpeg-devel@ffmpeg.org
Cc: Haihao Xiang <haihao.xi...@intel.com>
Subject: [FFmpeg-devel] [PATCH 1/2] qsvdec: add support for HW_DEVICE_CTX method
This allows user set hw_device_ctx instead of hw_frames_ctx for QSV decoders,
hence we may remove the ad-hoc libmfx setup code from FFmpeg.
"-hwaccel_output_format format" is applied to QSV decoders after removing the
ad-hoc libmfx code. In order to keep compatibility with old commandlines, the
default format is set to AV_PIX_FMT_QSV, but this behavior will be removed in
the future. Please set "-hwaccel_output_format qsv"
explicitly if AV_PIX_FMT_QSV is expected.
The normal device stuff works for QSV decoders now, user may use
"-init_hw_device args" to initialise device and "-hwaccel_device devicename" to
select a device for QSV decoders. "-qsv_device device"
which was added for workarounding device selection in the ad-hoc libmfx code is
deprecated and will be removed from FFmpeg.
For example:
$> ffmpeg -init_hw_device vaapi=va:/dev/dri/card0 -init_hw_device qsv=hw@va
-hwaccel qsv -c:v h264_qsv -i input.h264 -f null -
/dev/dri/renderD128 is actually open for h264_qsv decoder in the above command
without this patch. After applying this patch, /dev/dri/card0 is used.
$> ffmpeg -init_hw_device vaapi=va:/dev/dri/card0 -init_hw_device qsv=hw@va
-hwaccel_device hw -hwaccel qsv -c:v h264_qsv -i input.h264 -f null -
device hw of type qsv is not usable in the above command without this patch.
After applying this patch, this command works as expected.
---
Haihao,
I think, from all the not-yet-merged QSV patches, this is the most important
one.
I'll try to find some time to review shortly.
Is this patch independent of your other submitted patches?
softworkz
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