lavfi/avf_avectorscope: switch to query_func2()

Also, drop redundant calls that also happen implicitly in generic code.

libavfilter/avf_avectorscope.c

@@ -230,28 +230,29 @@ static int fade(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
     return 0;
 }
 
-static int query_formats(AVFilterContext *ctx)
+static int query_formats(const AVFilterContext *ctx,
+                         AVFilterFormatsConfig **cfg_in,
+                         AVFilterFormatsConfig **cfg_out)
 {
     AVFilterFormats *formats = NULL;
-    AVFilterChannelLayouts *layout = NULL;
-    AVFilterLink *inlink = ctx->inputs[0];
-    AVFilterLink *outlink = ctx->outputs[0];
     static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
+    static const AVChannelLayout layouts[] = {
+        AV_CHANNEL_LAYOUT_STEREO,
+        { .nb_channels = 0 },
+    };
     int ret;
 
     formats = ff_make_format_list(sample_fmts);
-    if ((ret = ff_formats_ref         (formats, &inlink->outcfg.formats        )) < 0 ||
-        (ret = ff_add_channel_layout  (&layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 ||
-        (ret = ff_channel_layouts_ref (layout , &inlink->outcfg.channel_layouts)) < 0)
+    if ((ret = ff_formats_ref         (formats, &cfg_in[0]->formats        )) < 0)
         return ret;
 
-    formats = ff_all_samplerates();
-    if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
+    ret = ff_set_common_channel_layouts_from_list2(ctx, cfg_in, cfg_out, layouts);
+    if (ret < 0)
         return ret;
 
     formats = ff_make_format_list(pix_fmts);
-    if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
+    if ((ret = ff_formats_ref(formats, &cfg_out[0]->formats)) < 0)
         return ret;
 
     return 0;
@@ -493,7 +494,7 @@ const AVFilter ff_avf_avectorscope = {
     .activate      = activate,
     FILTER_INPUTS(audiovectorscope_inputs),
     FILTER_OUTPUTS(audiovectorscope_outputs),
-    FILTER_QUERY_FUNC(query_formats),
+    FILTER_QUERY_FUNC2(query_formats),
     .priv_class    = &avectorscope_class,
     .flags         = AVFILTER_FLAG_SLICE_THREADS,
     .process_command = ff_filter_process_command,