how to add two audio pads(or caps) to a gstreamer pipeline

cfd new via gstreamer-devel <[email protected]>
Newsgroups gmane.comp.video.gstreamer.devel
Message-ID <[email protected]> 
I build a pipeline with decodebin to play video files. Video pad and audio pads are added dynamically. I noticed that there are two audio caps 
1. "audio/x-raw, format=(string)S16LE, layout=(string)non-interleaved, rate=(int)48000, channels=(int)2, channel-mask=(bitmask)0x0000000000000003" 
2. "audio/x-raw, format=(string)F32LE, layout=(string)non-interleaved, rate=(int)48000, channels=(int)6, channel-mask=(bitmask)0x0000000000000c0f"
How do I add these caps to the audio sink bin part?
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