Question about a custom decoder and caps renegotiation

[dv]

Hello,

I am writing a GStreamer plugin for a decoder. It already works fine, 
but outputs 16 bit integer samples at the moment, even though it 
supports many more formats.

My question is how to inform the decoder about the desired sample 
format. My guess is that I should use upstream caps renegotation. Here 
is an example of what I mean, using a capsfilter:

gst-launch-0.10 filesrc location=foo ! mydecoder ! "audio/x-raw-int, 
width=(int)32, signed=(boolean)true" ! fakesink

Then, the decoder would be told to produce 32bit signed integer samples.

Am I correct with this idea? Unfortunately, this section of the docs is 
incomplete:

http://gstreamer.freedesktop.org/data/doc/gstreamer/0.10.36/pwg/html/section-nego-upstream.html

"Unfortunately, not all details here have been worked out yet, so this 
documentation is incomplete. FIXME."

but the information on it is useful regardless.