[Speex-dev] white noise problem when using -DFIXED_POINT

[speex-dev at aerodrome.us]

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
> 
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> 
> 
>