Speex dev - Aug 2004 - segmentation fault on lost packets

On Sat, 2002-12-28 at 13:48, Matthias Granberry wrote:
> try it with packet loss, I get a segmentation fault.  If you want to
> see the file, I can put it up somewhere publicly accessible.  If
Please do put it up, if possible both the original as well as enocded
file. May be we can find something.

CCK./

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Somewhere in the new packet-loss concealment code, there is a bug.  I
tried encoding a 44100-hz stereo file and it decodes just fine, but if I
try it with packet loss, I get a segmentation fault.  If you want to
see the file, I can put it up somewhere publicly accessible.  If
someone here can't work on it, I'll be back on my home computer in a
few days, so I'll work on it then.

Thanks,
Matthias
----------------
matthias@route:~/vp32/speex/src/.libs$ gdb ./speexdec
GNU gdb 5.2.90_2002-11-20-cvs-debian
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "i386-linux"...
(gdb) run ~/public_html/01* --packet-loss 10 - > /dev/null
Starting program: /home/matthias/vp32/speex/src/.libs/speexdec
~/public_html/01
 --packet-loss 10 - > /dev/null
Decoding 44100 Hz audio using ultra-wideband (sub-band CELP) mode (VBR)
Encoded with Speex 1.0beta4
author=Star Wars
title=01 - A Wind to Shake the Stars

Program received signal SIGSEGV, Segmentation fault.
0x4001a475 in sb_decode_lost (st=0x8055280, out=0x805e678, dtx=0,
    stack=0x8058c18) at sb_celp.c:828
828           k1=SUBMODE(lpc_enh_k1);
(gdb) bt
#0  0x4001a475 in sb_decode_lost (st=0x8055280, out=0x805e678, dtx=0,
    stack=0x8058c18) at sb_celp.c:828
#1  0x4001a6f2 in sb_decode (state=0x8055280, bits=0x0, out=0x805e678)
    at sb_celp.c:936
#2  0x4001ee4b in speex_decode (state=0x8055280, bits=0x0, out=0x805e678)
    at modes.c:545
#3  0x4001a637 in sb_decode (state=0x8055208, bits=0x0, out=0xbfffcdf8)
    at sb_celp.c:901
#4  0x4001ee4b in speex_decode (state=0x8055208, bits=0x0, out=0xbfffcdf8)
    at modes.c:545
#5  0x08049edb in main (argc=5, argv=0xbffffd34) at speexdec.c:533
(gdb)

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> Somewhere in the new packet-loss concealment code, there is a bug.  I
> tried encoding a 44100-hz stereo file and it decodes just fine, but if I
> try it with packet loss, I get a segmentation fault.  If you want to
> see the file, I can put it up somewhere publicly accessible.  If
> someone here can't work on it, I'll be back on my home computer in
a
> few days, so I'll work on it then.
OK, I've been able to reproduce and identify the bug. I'll fix it
soon...

        Jean-Marc


-- 
Jean-Marc Valin, M.Sc.A.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada

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