[FFmpeg-devel] [PATCH v2 1/2] avfilter: add a hflip_vulkan filter

[Andreas Rheinhardt]

Wu Jianhua:
> The following command is on how to apply hflip_vulkan filter:
> 
> ffmpeg -init_hw_device vulkan -i input.264 -vf hwupload=extra_hw_frames=16,hflip_vulkan,hwdownload,format=yuv420p output.264
> 
> Signed-off-by: Wu Jianhua <jianhua.wu at intel.com>
> ---
>  configure                     |   1 +
>  libavfilter/Makefile          |   1 +
>  libavfilter/allfilters.c      |   1 +
>  libavfilter/vf_hflip_vulkan.c | 276 ++++++++++++++++++++++++++++++++++
>  4 files changed, 279 insertions(+)
>  create mode 100644 libavfilter/vf_hflip_vulkan.c
> 

> +
> +static const AVOption hflip_vulkan_options[] = {
> +    { NULL },
> +};
> +
> +AVFILTER_DEFINE_CLASS(hflip_vulkan);
> +

What is the point of this class with its empty options?

> +static const AVFilterPad hflip_vulkan_inputs[] = {
> +    {
> +        .name         = "default",
> +        .type         = AVMEDIA_TYPE_VIDEO,
> +        .filter_frame = &hflip_vulkan_filter_frame,
> +        .config_props = &ff_vk_filter_config_input,
> +    }
> +};
> +
> +static const AVFilterPad hflip_vulkan_outputs[] = {
> +    {
> +        .name         = "default",
> +        .type         = AVMEDIA_TYPE_VIDEO,
> +        .config_props = &ff_vk_filter_config_output,
> +    }
> +};
> +
> +const AVFilter ff_vf_hflip_vulkan = {
> +    .name           = "hflip_vulkan",
> +    .description    = NULL_IF_CONFIG_SMALL("Horizontally flip the input video in Vulkan"),
> +    .priv_size      = sizeof(HFlipVulkanContext),
> +    .init           = &ff_vk_filter_init,
> +    .uninit         = &hflip_vulkan_uninit,
> +    FILTER_INPUTS(hflip_vulkan_inputs),
> +    FILTER_OUTPUTS(hflip_vulkan_outputs),
> +    FILTER_SINGLE_PIXFMT(AV_PIX_FMT_VULKAN),
> +    .priv_class     = &hflip_vulkan_class,
> +    .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
> +};
>