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: 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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