Speex dev - Sep 2004 - white noise problem when using -DFIXED_POINT

Hi there.  We're trying to build a speex decoder for Palm OS (i.e. ARM7).

No major problems porting thus far, but when compiling the speex modules with
-DFIXED_POINT all the silent parts of the output are replaced with what sounds
like high-power white noise.  The spoken parts sound great, but all the silent
parts in between speaking just sounds like white noise.

We're using speex 1.1.6, and current libogg sources pulled down from
subversion.

Any help much appreciated!

Regards,
Owen

On mar, 2004-09-14 at 16:31 -0700, wrote:
> Hi there.  We're trying to build a speex decoder for Palm OS (i.e.
ARM7).
> 
> No major problems porting thus far, but when compiling the speex modules
with -DFIXED_POINT all the silent parts of the output are replaced with what
sounds like high-power white noise.  The spoken parts sound great, but all the
silent parts in between speaking just sounds like white noise.
> 
> We're using speex 1.1.6, and current libogg sources pulled down from
subversion.
It's difficult to say with only that info. Have you tried the same file
on an x86 (with and without FIXED_POINT) and comparing the results. If
you still can't find the problem, please post the file somewhere (along
with the encoded version) and I'll have a look at it. Oh, and are you
using speexenc/speexdec or you own encoder and decoder?

	Jean-Marc

Jean-Marc Valin wrote:
> On mar, 2004-09-14 at 16:31 -0700, wrote:
> 
>>Hi there.  We're trying to build a speex decoder for Palm OS (i.e.
ARM7).
>>
>>No major problems porting thus far, but when compiling the speex modules
with -DFIXED_POINT all the silent parts of the output are replaced with what
sounds like high-power white noise.  The spoken parts sound great, but all the
silent parts in between speaking just sounds like white noise.
>>
>>We're using speex 1.1.6, and current libogg sources pulled down from
subversion.
> 
> 
> It's difficult to say with only that info. Have you tried the same file
> on an x86 (with and without FIXED_POINT) and comparing the results. If
> you still can't find the problem, please post the file somewhere (along
> with the encoded version) and I'll have a look at it. Oh, and are you
> using speexenc/speexdec or you own encoder and decoder?
> 
> 	Jean-Marc
Jean-Marc,

Thanks for the quick reply, and sorry for eliding some of the details.  Our test
builds thus far have indeed been on x86.  I reproduced the white noise condition
described above using unmodified speexdec from speex 1.1.6, configured with
--enable-fixed-point.  The output sounds okay when configured without fixed
point support.

As I mentioned, we're using speex 1.1.6, current svn libogg, and gcc 2.95.4.

Here is one of the files that seems to exhibit the problem:
http://owen.theemrys.com/speex/0102.spx

Thanks in advance for any information.  I've spent the last few hours
combing the list archives, but nothing seems to stand out.

Best regards,
Owen