avfilter/vf_scale_npp: Store format in filter, remove query function

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavfilter/vf_scale_npp.c

@@ -143,14 +143,6 @@ static void nppscale_uninit(AVFilterContext *ctx)
     av_frame_free(&s->tmp_frame);
 }
 
-static int nppscale_query_formats(AVFilterContext *ctx)
-{
-    static const enum AVPixelFormat pixel_formats[] = {
-        AV_PIX_FMT_CUDA, AV_PIX_FMT_NONE,
-    };
-    return ff_set_common_formats_from_list(ctx, pixel_formats);
-}
-
 static int init_stage(NPPScaleStageContext *stage, AVBufferRef *device_ctx)
 {
     AVBufferRef *out_ref = NULL;
@@ -601,7 +593,7 @@ const AVFilter ff_vf_scale_npp = {
     FILTER_INPUTS(nppscale_inputs),
     FILTER_OUTPUTS(nppscale_outputs),
 
-    FILTER_QUERY_FUNC(nppscale_query_formats),
+    FILTER_SINGLE_PIXFMT(AV_PIX_FMT_CUDA),
 
     .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
 };