SV: [Speex-dev] How to detect SpeexBits corruption
tgrand at canvaslink.com
Thu Jan 25 06:24:09 PST 2007
You might not be doing anything wrong. Speex is stateful and can
get into a bad state sometimes. It's happened to me too, but not
recently. And I've seen such bugs reported on this list and fixed.
I suggest several approaches to solving the problem:
1) Try compiling Speex without compiler optimizations and see if the
problem still occurs. Most likely it will, but this is an essential
2) Try to make the problem trivially reproducible for others so that
the bug (if it exists) can be tracked down and fixed. You must
identify exactly which version of Speex you're using and provide
sample data, code, and instructions so that someone else can
reproduce the problem with minimal effort.
3) Try to be nice to Speex. Don't feed the decoder corrupted data,
out of order data, data with gaps, etc. Put extra checks in your
code/protocol to make sure you're decoding exactly the data that
the encoder produced. You might be surprised at the result. Also
keep in mind that the nature of the audio data itself may be
triggering the problem, especially if it is unusual in some way.
jesus <jmorion at toomeeting.com> wrote:
> thank you, i will explain it more detailed:
> I use libspeex in an activeX project compiled on Visual C++ 2003
> (Windows XP).
> I have one array of SpeexBits and other of decoder states. The first
> time a user speaks, i create and initialize the elements of those arrays
> who correspond to his user_id. Next packets of this user are decoded
> using those elements. The decoder instance is always the same for every
> user packets.
> It works fine most time, but sometimes one user begins to sound like
> voice hits and the others still sounds ok. At that point, if i destroy
> his elements of the two arrays and re-create and initialize, it solves.
> OK, I will read speechenc/dec just one more time.
> Thank you.
> Jonas Tärnström wrote:
> > You're doing something wrong.
> > Read the documentation and check speechenc/dec just one more time.
> > If that wouldn't help I'd suggest posting samples of your source code
> > and describe what platform/compiler/os you're using.
> > //JT
> > -----Ursprungligt meddelande-----
> > Från: speex-dev-bounces at xiph.org [mailto:speex-dev-bounces at xiph.org] För
> > jesus
> > Skickat: den 22 januari 2007 19:43
> > Till: speex-dev at xiph.org
> > Ämne: [Speex-dev] How to detect SpeexBits corruption
> > Hello,
> > im using speex library on my vo ip project, but some times, after it
> > works ok, it begins to play noises (like voice hits) decoding the
> > packets of one source (the others sound ok).
> > I finally found that reseting SpeexBits and decoder state it solves.
> > If i cant avoid this problem, i wish to solve when it occours, but ¿how
> > to detect this?
> > Please, if anyone has experiment this issue i will thank any help.
> > by MJM.
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