I can't automatically connect sink plugin using playbin2

[hero88]

I made mp3 decoder/ pcm plugin.
It works well, when it is connected using gst-launch.
but when using the playbin2, it cannot be connected to pcm sink.

"are_final_caps"  return ture, so decodebin2 stop to find next plugin.

And src cap of mp3 decoder is defined as below.

static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE
("mp3-decoder",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (
        "audio/x-raw-int, "
        "rate = (int) {8000, 11025, 12000, 16000, 22050, 24000, 32000,
44100, 48000}, "        
        "channels = (int) [1, 2], "
        "width = (int) {8, 16}, "
        "signed = (boolean) {true, false} "       
      )
    );


analyze_new_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad,
    GstCaps * caps, GstDecodeChain * chain)

{

  /* 1.a if autoplug-continue is FALSE or caps is a raw format, goto
pad_is_final */
  if (are_final_caps (dbin, caps))
    goto expose_pad;

}



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