Re: [FFmpeg-devel] [PATCH] Allow exporting of RGB and BGR images to CUDA.

[<dpeeters@MRU.MEDICAL.CANON>]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> dpeeters@MRU.MEDICAL.CANON
> Sent: Thursday, July 28, 2022 11:24 AM
> To: ffmpeg-devel@ffmpeg.org
> Subject: [EXTERNAL] Re: [FFmpeg-devel] [PATCH] Allow exporting of RGB
> and BGR images to CUDA.
> 
> > -----Original Message-----
> > From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> > dpeeters@MRU.MEDICAL.CANON
> > Sent: Friday, July 8, 2022 4:51 PM
> > To: ffmpeg-devel@ffmpeg.org
> > Subject: [EXTERNAL] [FFmpeg-devel] [PATCH] Allow exporting of RGB and
> > BGR images to CUDA.
> >
> > Use the step size when calculating the number of channels to allow for
> > more than two channels per plane.  This allows the use of
> > AV_PIX_FMT_0BGR32 when using av_hwframe_transfer_data to transfer
> data
> > from a Vulkan frame to a CUDA frame.
> >
> > Signed-off-by: David Peeters <dpeeters@MRU.MEDICAL.CANON>
> > ---
> >  libavutil/hwcontext_vulkan.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/libavutil/hwcontext_vulkan.c
> > b/libavutil/hwcontext_vulkan.c index 237caa4bc0..05e8fc5268 100644
> > --- a/libavutil/hwcontext_vulkan.c
> > +++ b/libavutil/hwcontext_vulkan.c
> > @@ -2992,6 +2992,8 @@ static int
> > vulkan_export_to_cuda(AVHWFramesContext *hwfc,
> >      const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(hwfc-
> > >sw_format);
> >      VulkanDevicePriv *p = ctx->internal->priv;
> >      FFVulkanFunctions *vk = &p->vkfn;
> > +    int max_pixsteps[4];
> > +    int max_pixstep_comps[4];
> >
> >      AVHWFramesContext *cuda_fc = (AVHWFramesContext*)cuda_hwfc-
> > >data;
> >      AVHWDeviceContext *cuda_cu = cuda_fc->device_ctx; @@ -3001,6
> > +3003,8 @@ static int vulkan_export_to_cuda(AVHWFramesContext
> *hwfc,
> >      CUarray_format cufmt = desc->comp[0].depth > 8 ?
> > CU_AD_FORMAT_UNSIGNED_INT16 :
> >
> > CU_AD_FORMAT_UNSIGNED_INT8;
> >
> > +    av_image_fill_max_pixsteps(max_pixsteps, max_pixstep_comps,
> > + desc);
> > +
> >      dst_f = (AVVkFrame *)frame->data[0];
> >
> >      dst_int = dst_f->internal;
> > @@ -3023,7 +3027,9 @@ static int
> > vulkan_export_to_cuda(AVHWFramesContext *hwfc,
> >                  .arrayDesc = {
> >                      .Depth = 0,
> >                      .Format = cufmt,
> > -                    .NumChannels = 1 + ((planes == 2) && i),
> > +                    .NumChannels = desc->comp[max_pixstep_comps[i]].depth > 8
> > +                        ? max_pixsteps[i] / 2
> > +                        : max_pixsteps[i],
> >                      .Flags = 0,
> >                  },
> >                  .numLevels = 1,
> > --
> > 2.36.1
> >
> > _______________________________________________
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> > ffmpeg-devel@ffmpeg.org
> >
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