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

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

libavfilter/af_compand.c

@@ -100,23 +100,6 @@ static av_cold void uninit(AVFilterContext *ctx)
     av_frame_free(&s->delay_frame);
 }
 
-static int query_formats(AVFilterContext *ctx)
-{
-    static const enum AVSampleFormat sample_fmts[] = {
-        AV_SAMPLE_FMT_DBLP,
-        AV_SAMPLE_FMT_NONE
-    };
-    int ret = ff_set_common_all_channel_counts(ctx);
-    if (ret < 0)
-        return ret;
-
-    ret = ff_set_common_formats_from_list(ctx, sample_fmts);
-    if (ret < 0)
-        return ret;
-
-    return ff_set_common_all_samplerates(ctx);
-}
-
 static void count_items(char *item_str, int *nb_items)
 {
     char *p;
@@ -580,5 +563,5 @@ const AVFilter ff_af_compand = {
     .uninit         = uninit,
     FILTER_INPUTS(compand_inputs),
     FILTER_OUTPUTS(compand_outputs),
-    FILTER_QUERY_FUNC(query_formats),
+    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
 };