func: 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;
  
  }
  