[Speex-dev] Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"

[Frank Lorenz]

Hi Jean-Marc, all,

I didn't get any response to my issue up to now and would like to now if anyone can reproduce this behaviour and if there is some idea what happens. I am willing to fix this issue, but because I do not know the internals of speex, I need some advice on how to proceed...

best regards,
Frank



Frank Lorenz <Frank_wtal at web.de> hat am 21. Dezember 2009 um 10:49 geschrieben:

> An update:
>
> I found that the "ADD32: output is not int:" messages are caused by the enhancer. When I turn the enhancer off, the messages vanish, but the "freak out" of the codec is still there - so the problem seems not to be related to the overflow messages.
>
> best regards,
> Frank
>
>
> ---------- Ursprüngliche Nachricht ----------
> Von: Frank Lorenz <Frank_wtal at web.de>
> An: speex-dev at xiph.org
> Datum: 18. Dezember 2009 um 13:36
> Betreff: [Speex-dev] Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"
>
> Hi,
>
> I'm quite sure we found a bug inside the codec (1.2rc1, wideband mode). It only
> occurs when speex is compiled with the FIXED_POINT flag.
>
> I feed in a 2000 Hz sine wave (-15 dBFS). When I simulate a single frame loss
> (i.e. pass a null pointer to speex_decode_int as second parameter for just one frame), the decoder
> starts to freak out a second later: It produces horrible noise with 0 dBFS. This
> horrible noise will not vanish until you turn off the input signal.
>
> I did some investigation on this with FIXED_DEBUG. The error messages are (lots
> of this):
> ADD32: output is not int: 1702286034 in ltp.c: line 68
> ADD32: output is not int: 1455757562 in ltp.c: line 69
>
> Call stack for this (only set the break point once, may be there are other call
> stacks on error, too):
>
> sb_decode ( ) at sb_celp.c:898
> nb_decode ( ) at nb_celp.c:1471
> multicomb ( ) at filter.c:709
> interp_pitch ( ) at filter.c:603
> inner_prod ( ) at ltp.c:68
>
> Can you help please?
>
> best regards,
> Frank
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