Jun 12, 2021, 00:26 by t...@rothenpieler.org:
> On 11.06.2021 17:33, Steven Liu wrote:
>
>>
>>
>>> 在 2021年6月11日，22:43，Timo Rothenpieler <t...@rothenpieler.org> 写道：
>>>
>> Hi Timo,
>>
>>>
>>> ---
>>> configure | 2 +
>>> doc/filters.texi | 46 ++
>>> libavfilter/Makefile | 1 +
>>> libavfilter/allfilters.c | 1 +
>>> libavfilter/cuda/vector_helpers.cuh | 14 +-
>>> libavfilter/version.h | 2 +-
>>> libavfilter/vf_format_cuda.c | 433 ++++++++++++++
>>> libavfilter/vf_format_cuda.cu | 849 ++++++++++++++++++++++++++++
>>> 8 files changed, 1345 insertions(+), 3 deletions(-)
>>> create mode 100644 libavfilter/vf_format_cuda.c
>>> create mode 100644 libavfilter/vf_format_cuda.cu
>>>
>>> diff --git a/configure b/configure
>>> index 6bfd98b384..7041c09177 100755
>>> --- a/configure
>>> +++ b/configure
>>> @@ -3078,6 +3078,8 @@ qsvvpp_select="qsv"
>>> vaapi_encode_deps="vaapi"
>>> v4l2_m2m_deps="linux_videodev2_h sem_timedwait"
>>>
>>> +format_cuda_filter_deps="ffnvcodec"
>>> +format_cuda_filter_deps_any="cuda_nvcc cuda_llvm"
>>> hwupload_cuda_filter_deps="ffnvcodec"
>>> scale_npp_filter_deps="ffnvcodec libnpp"
>>> scale_cuda_filter_deps="ffnvcodec"
>>> diff --git a/doc/filters.texi b/doc/filters.texi
>>> index 78faf767cf..27a0184cb3 100644
>>> --- a/doc/filters.texi
>>> +++ b/doc/filters.texi
>>> @@ -12324,6 +12324,52 @@ format=pix_fmts=yuv420p|yuv444p|yuv410p
>>> @end example
>>> @end itemize
>>>
>>> +@anchor{format_cuda}
>>> +@section format_cuda
>>> +
>>> +Convert the input video to one of the specified pixel formats.
>>> +Libavfilter will try to pick one that is suitable as input to
>>> +the next filter.
>>> +
>>> +It accepts the following parameters:
>>> +@table @option
>>> +
>>> +@item format
>>> +The name of the desired output format.
>>> +If none is specified, the input format will be used.
>>> +
>>> +@item passthrough
>>> +If true, input frames matching the output format will be passed
>>> +through as-is.
>>> +If false, every input frame is processed. Frames matching the
>>> +output format will be copied without data modification. This is
>>> +the default mode.
>>> +
>>> +@end table
>>> +
>>> +@subsection Examples
>>> +
>>> +@itemize
>>> +@item
>>> +Convert the input video to the @var{yuv420p} format.
>>> +@example
>>> +format_cuda=yuv420p
>>>
>> maybe need an format for alpha blend, be used in overlay_cuda for colorkey
>> linkly feature.
>>
>
> I had this lying around for a long time. It's also lacking support for the
> RGB formats.
> Planned to enhance this, but never got around to it.
>
> Kinda just want to get this merged as-is now, to enable work on enhancements
> of the filter.
>
> Adding the alpha formats should be fairly simple, though I'm not sure what to
> do in the conversion. Should it just discard the alpha channel in the one
> direction, and add a fully opaque one the other way around?
>
Just a nit, could the filter get merged into scale_cuda? I'm used to how
other scale filters work.
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