static int channelmap_query_formats(AVFilterContext *ctx) { ChannelMapContext *s = ctx->priv; ff_set_common_formats(ctx, ff_planar_sample_fmts()); ff_set_common_samplerates(ctx, ff_all_samplerates()); ff_channel_layouts_ref(ff_all_channel_layouts(), &ctx->inputs[0]->out_channel_layouts); ff_channel_layouts_ref(s->channel_layouts, &ctx->outputs[0]->in_channel_layouts); return 0; }