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

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

Hi Owen,

I have little time right now to look at the details, but it would help
if you could test with all 1.1.x versions and see when the problem
appeared. Also, compile with --enable-fixed-point-debug so messages will
be printed in case of overflows.

	Jean-Marc

P.S. Please also post the original file.

On mar, 2004-09-14 at 22:42 -0700, wrote:
> 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

It seems that with the file I posted, the decode noise persists all the way back
to 1.1.1, when using --enable-fixed-point.

When we configure with --enable-fixed-point-debug, the decode seems to be
correct, even on 1.1.6.

Hope this helps, and thanks for your time!

Regards,
Owen

Jean-Marc Valin wrote:
> Hi Owen,
> 
> I have little time right now to look at the details, but it would help
> if you could test with all 1.1.x versions and see when the problem
> appeared. Also, compile with --enable-fixed-point-debug so messages will
> be printed in case of overflows.
> 
> 	Jean-Marc
> 
> P.S. Please also post the original file.
> 
> On mar, 2004-09-14 at 22:42 -0700, wrote:
> 
>>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
> 
> 
> 
> 
>