Wavparse - getting to blockalign, format, etc.

Thanks ensonic, I have it "kind of" working
now...

In my set_caps() function, I'm doing this:

------------ start code -----------

  GstpalmADPCM *filter;
  GstStructure *ins;

  filter = GST_PALMADPCM (gst_pad_get_parent (pad));

  ins = gst_caps_get_structure(caps, 0);

  if (gst_structure_get_int (ins, "channels",
&filter->channels)) {
	printf("channels: %dn", filter->channels);
  }

  if (gst_structure_get_int (ins, "rate",
&filter->rate)) {
	printf("rate: %dn", filter->rate);
  }

  if (gst_structure_get_int (ins, "format",
&filter->format)) {
	printf("format: %dn", filter->format);
  }
------------------- end code -------------------

I see rate and channels, but no format - even though I see
wavparse print 
the information out!  I need the format, among other bits of
info.. and from 
poking around in gstwavparse.c it looks like it's there..
somewhere.. but 
I'm not sure the above mechanism is proper (or maybe I just
am not using the 
Right Names(tm) for things)..

Any suggestions, recommendations, or examples I can pilfer
from?

All info appreciated! 

...ed..

>Message: 3
>Date: Thu, 18 Jan 2007 09:03:54 +0100
>From: "ensonic" <ensonichora-obscura.de>
>Subject: Re: [gst-devel] Wavparse to rip apart
compressed audio?
>	Newbie Q.
>To: " Edward Averill " <edaverillhotmail.com>
>Cc: gstreamer-devellists.sourceforge.net
>Message-ID: <5ea9f03ca39308b15e30f7ab307f807ehora-obscura.de>
>Content-Type: text/plain; charset=us-ascii
>
>hi,
>
>On 1:02:09 am 18/01/2007 "Edward Averill"
<edaverillhotmail.com> wrote:
> > Ok, I have some RIFF-format files I need to get
the fmt info from.
> > The data inside is compressed, but I have an
element that will handle
> > that...
> >
> > What I'm wondering is: is there any reason I can't
use the data
> > output from the wavparse element to feed my
decoder?  And is there an
> > example of how to get the channels/bit depth/etc.
information out of
> > the wavparse element, or will I need to write my
own wavparse-like
> > library that will give me access to that
information? I see that I
> > can use the gstriff library to help with this, if
needed.
> >
>wavparse acts as a demuxer. it parses the riff-wav
container and emits data
>packets. the meta data of the stream is parts of the
caps. additional
>metadata might be send as tags.
>
>what format is it that you need to decode? if you run
'gst-inspect
>wavparse' you see that it already knows about lot of
formats (like
>audio/ms-gsm, audio/x-mulaw, audio/x-adpcm, ...). If
your format is not
>among this, we need to add a fourcc mapping.
>
>Is the decoder you want to use already a gstreamer
element? Once the output
>caps are fine, you should be able to plug it in.
>
>Stefan
>
> > Sorry if this is a newbie type question, my last
element was
> > standalone and I'm trying to Use What's There this
time rather than
> > Re-Invent The Wheel.
> >
> > ...ed..



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