On Thu, Nov 18, 2021 at 6:27 AM Andreas Rheinhardt <
andreas.rheinha...@outlook.com> wrote:
> Wu, Jianhua:
> > Andreas Rheinhardt wrote:
> >> 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...@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?
> >
> > The AVFILTER_DEFINE_CLASS needs the hflip_vulkan_options and the reason
> why it's NULL
> > is that the most other filters do it like that.
> >
>
> And why do you add an AVClass at all?
> (The reason that there are some filters with AVClass and empty options
> is a bug in avfilter_init_str() which errors out when given options for
> a filter without AVClass, although it is perfectly fine to set options
> on a filter without AVClass, namely generic AVFilter options (this is
> important for e.g. framesync filters, but not for this filter here).)
>
There are abandoned patches of yours that resolved this.
>
> >>
> >>> +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, };
> >>>
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