[PD] netsend~/netreceive~

Michal Seta mis at artengine.ca
Sat Jan 9 21:12:20 CET 2010


Hi all,

Happy new decade!

I have been playing around with the above captioned pair of externs.
I grabbed them from the audioscape project .

I intend to use them for jamming over WiFi (and it has to be WiFi).
My first tests are rather promising but there are some glitches.
[netreceive~] tends to crash pd with a lot of underflows.  This seems
to happen mostly whenever WiFi signal strength is not optimal (in the
50-60% range).  For the moment, the idea is that the jamming happens
using netbooks running linux.  5 players will send mono signals to a
server which will play back the 5 signals directly and send back mono
signals, one to each player.  Currently I am testing on an Acer Aspire
One (atom 1.6), Ubuntu Karmic and pd-extended 0.42.5.

Also, I have compiled those externals for MacOSX but they seem to not
be working correctly, all I get is sporadic short bursts of audio (on
Mac receiving side).  The mac was wired but not to the same network (2
linux machines, one on WiFi and antoher on wired, also different
networks, can keep going for several minutes before one of them
crashes).

I am running netsend~/receive~ in UDP mode.

Below are backtraces.

Thanks for any insight, tips etc.

./MiS

gdb backtrace:
#0  0x00b36422 in __kernel_vsyscall ()
#1  0x002644d1 in raise () from /lib/tls/i686/cmov/libc.so.6
#2  0x00267932 in abort () from /lib/tls/i686/cmov/libc.so.6
#3  0x0029aee5 in ?? () from /lib/tls/i686/cmov/libc.so.6
#4  0x002a4ff1 in ?? () from /lib/tls/i686/cmov/libc.so.6
#5  0x002a83eb in ?? () from /lib/tls/i686/cmov/libc.so.6
#6  0x002a9039 in calloc () from /lib/tls/i686/cmov/libc.so.6
#7  0x080b9e0d in getbytes (nbytes=16) at m_memory.c:24
#8  0x080c6600 in sys_queuegui (client=0x864fad8, glist=0x8627a88,
    f=0x80b2c20 <vu_draw_update>) at s_inter.c:815
#9  0x080b313d in vu_ft1 (x=0x864fad8, peak=-97) at g_vumeter.c:623
#10 0x080b6516 in pd_typedmess (x=0x864fad8, s=0x8521d60, argc=1,
    argv=0xbfffef30) at m_class.c:792
#11 0x080b682f in pd_vmess (x=0x864fad8, sel=0x8521d60, fmt=0x8105b2f "f")
    at m_class.c:855
#12 0x080b951e in inlet_float (x=0x6, f=-97) at m_obj.c:100
#13 0x080b8f3f in obj_list (x=0x864fad8, s=0x8111b70, argc=2, argv=0x864f8f0)
    at m_obj.c:270
#14 0x080b89ff in outlet_list (x=0x864f938, s=0x8111b70, argc=2,
    argv=0x864f8f0) at m_obj.c:431
#15 0x080e4a3e in pack_bang (x=0x864f8a0) at x_connective.c:718
#16 0x080b8c37 in outlet_float (x=0x864f840, f=-97) at m_obj.c:397
#17 0x080e5ce1 in trigger_list (x=0x864f800, s=0x0, argc=1, argv=0xbffff0d8)
    at x_connective.c:979
#18 0x080e5fb7 in trigger_float (x=0x864f800, f=-97) at x_connective.c:1025
#19 0x080b8c37 in outlet_float (x=0x864f550, f=-97) at m_obj.c:397
#20 0x080b8c37 in outlet_float (x=0x864f450, f=0) at m_obj.c:397
#21 0x08059af2 in env_tilde_tick (x=0x864f370) at d_ctl.c:671
#22 0x080c33bc in sched_tick (next_sys_time=925163520) at m_sched.c:374
#23 0x080c3803 in m_pollingscheduler () at m_sched.c:484
#24 m_mainloop () at m_sched.c:560
#25 0x080c64c9 in sys_main (argc=2, argv=0xbffff344) at s_main.c:304
#26 0x080ce16b in main (argc=2, argv=0xbffff344) at s_entry.c:32


And this at the moment it crashed:

*** glibc detected *** /usr/bin/pd: malloc(): memory corruption
(fast): 0x086df120 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0x2a4ff1]
/lib/tls/i686/cmov/libc.so.6[0x2a83eb]
/lib/tls/i686/cmov/libc.so.6(__libc_calloc+0xa9)[0x2a9039]
/usr/bin/pd(getbytes+0x1d)[0x80b9e0d]
======= Memory map: ========
00110000-001d2000 r-xp 00000000 08:05 1661634    /usr/lib/libasound.so.2.0.0
001d2000-001d6000 r--p 000c1000 08:05 1661634    /usr/lib/libasound.so.2.0.0
001d6000-001d7000 rw-p 000c5000 08:05 1661634    /usr/lib/libasound.so.2.0.0
001d7000-001d9000 r-xp 00000000 08:05 1221747
/lib/tls/i686/cmov/libdl-2.10.1.so
001d9000-001da000 r--p 00001000 08:05 1221747
/lib/tls/i686/cmov/libdl-2.10.1.so
001da000-001db000 rw-p 00002000 08:05 1221747
/lib/tls/i686/cmov/libdl-2.10.1.so
001db000-001dd000 r-xp 00000000 08:05 1385642    /usr/lib/libXdamage.so.1.1.0
001dd000-001de000 rw-p 00001000 08:05 1385642    /usr/lib/libXdamage.so.1.1.0
001de000-001e5000 r-xp 00000000 08:05 1665962    /usr/lib/libSM.so.6.0.0
001e5000-001e6000 r--p 00006000 08:05 1665962    /usr/lib/libSM.so.6.0.0
001e6000-001e7000 rw-p 00007000 08:05 1665962    /usr/lib/libSM.so.6.0.0
001e7000-001eb000 r-xp 00000000 08:05 1664871    /usr/lib/libXtst.so.6.1.0
001eb000-001ec000 r--p 00004000 08:05 1664871    /usr/lib/libXtst.so.6.1.0
001ec000-001ed000 rw-p 00005000 08:05 1664871    /usr/lib/libXtst.so.6.1.0
001ed000-00224000 r-xp 00000000 08:05 1221679    /lib/libdbus-1.so.3.4.0
00224000-00225000 r--p 00036000 08:05 1221679    /lib/libdbus-1.so.3.4.0
00225000-00226000 rw-p 00037000 08:05 1221679    /lib/libdbus-1.so.3.4.0
00226000-0022a000 r-xp 00000000 08:05 1662885    /usr/lib/libXdmcp.so.6.0.0
0022a000-0022b000 rw-p 00003000 08:05 1662885    /usr/lib/libXdmcp.so.6.0.0
0022b000-0022f000 r-xp 00000000 08:05 1665042    /usr/lib/libXxf86vm.so.1.0.0
0022f000-00230000 r--p 00003000 08:05 1665042    /usr/lib/libXxf86vm.so.1.0.0
00230000-00231000 rw-p 00004000 08:05 1665042    /usr/lib/libXxf86vm.so.1.0.0
00231000-00235000 r-xp 00000000 08:05 1665814    /usr/lib/libXfixes.so.3.1.0
00235000-00236000 r--p 00003000 08:05 1665814    /usr/lib/libXfixes.so.3.1.0
00236000-00237000 rw-p 00004000 08:05 1665814    /usr/lib/libXfixes.so.3.1.0
00237000-00239000 r-xp 00000000 08:05 1385644    /usr/lib/libXinerama.so.1.0.0
00239000-0023a000 rw-p 00001000 08:05 1385644    /usr/lib/libXinerama.so.1.0.0
0023a000-00378000 r-xp 00000000 08:05 1221709
/lib/tls/i686/cmov/libc-2.10.1.so
00378000-00379000 ---p 0013e000 08:05 1221709
/lib/tls/i686/cmov/libc-2.10.1.so
00379000-0037b000 r--p 0013e000 08:05 1221709
/lib/tls/i686/cmov/libc-2.10.1.so
0037b000-0037c000 rw-p 00140000 08:05 1221709
/lib/tls/i686/cmov/libc-2.10.1.so
0037c000-0037f000 rw-p 00000000 00:00 0
0037f000-00385000 r-xp 00000000 08:05 1661834    /usr/lib/libv4l2.so.0
00385000-00386000 r--p 00005000 08:05 1661834    /usr/lib/libv4l2.so.0
00386000-00389000 rw-p 00006000 08:05 1661834    /usr/lib/libv4l2.so.0
00389000-00391000 r-xp 00000000 08:05 1667003    /usr/lib/libdrm.so.2.4.0
00391000-00392000 r--p 00007000 08:05 1667003    /usr/lib/libdrm.so.2.4.0
00392000-00393000 rw-p 00008000 08:05 1667003    /usr/lib/libdrm.so.2.4.0
00393000-00394000 r-xp 00000000 08:05 2285962
/usr/lib/pd/extra/libdir.pd_linux
00394000-00395000 r--p 00000000 08:05 2285962
/usr/lib/pd/extra/libdir.pd_linux
00395000-00396000 rw-p 00001000 08:05 2285962
/usr/lib/pd/extra/libdir.pd_linux
00398000-003d6000 r-xp 00000000 08:05 1664250    /usr/lib/libpulse.so.0.12.0
003d6000-003d7000 r--p 0003d000 08:05 1664250    /usr/lib/libpulse.so.0.12.0
003d7000-003d8000 rw-p 0003e000 08:05 1664250    /usr/lib/libpulse.so.0.12.0
003d8000-00502000 r-xp 00000000 08:05 1661788    /usr/lib/libX11.so.6.2.0
00502000-00503000 ---p 0012a000 08:05 1661788    /usr/lib/libX11.so.6.2.0
00503000-00504000 r--p 0012a000 08:05 1661788    /usr/lib/libX11.so.6.2.0
00504000-00506000 rw-p 0012b000 08:05 1661788    /usr/lib/libX11.so.6.2.0
00506000-00507000 rw-p 00000000 00:00 0
00507000-00512000 r-xp 00000000 08:05 1664126    /usr/lib/libvorbisenc.so.2.0.3
00512000-00513000 r--p 0000a000 08:05 1664126    /usr/lib/libvorbisenc.so.2.0.3
00513000-00603000 rw-p 0000b000 08:05 1664126    /usr/lib/libvorbisenc.so.2.0.3
00603000-0060c000 r-xp 00000000 08:05 1664873    /usr/lib/liba52-0.7.4.so
0060c000-0060d000 rw-p 00008000 08:05 1664873    /usr/lib/liba52-0.7.4.so
0060d000-0060e000 rw-p 00000000 00:00 0
0060f000-00616000 r-xp 00000000 08:05 1222043
/lib/tls/i686/cmov/librt-2.10.1.so
00616000-00617000 r--p 00006000 08:05 1222043
/lib/tls/i686/cmov/librt-2.10.1.so
00617000-00618000 rw-p 00007000 08:05 1222043
/lib/tls/i686/cmov/librt-2.10.1.so
00618000-00633000 r-xp 00000000 08:05 1662988    /usr/lib/libdv.so.4.0.3
00633000-00634000 r--p 0001b000 08:05 1662988    /usr/lib/libdv.so.4.0.3
00634000-00636000 rw-p 0001c000 08:05 1662988    /usr/lib/libdv.so.4.0.3
00636000-00642000 rw-p 00000000 00:00 0
00642000-00664000 r-xp 00000000 08:05 1384686    /usr/lib/libmpeg3.so.1.5.4
00664000-00669000 rw-p 00022000 08:05 1384686    /usr/lib/libmpeg3.so.1.5.4
00669000-0067c000 rw-p 00000000 00:00 0
0067c000-006ea000 r-xp 00000000 08:05 1662248    /usr/lib/libGLU.so.1.3.070600
006ea000-006eb000 r--p 0006e000 08:05 1662248    /usr/lib/libGLU.so.1.3.070600
006eb000-006ec000 rw-p 0006f000 08:05 1662248    /usr/lib/libGLU.so.1.3.070600
006ec000-00716000 r-xp 00000000 08:05 1665071    /usr/lib/libftgl.so.2.1.3
00716000-00718000 r--p 00029000 08:05 1665071    /usr/lib/libftgl.so.2.1.3
00718000-00719000 rw-p 0002b000 08:05 1665071    /usr/lib/libftgl.so.2.1.3
00719000-00721000 r-xp 00000000 08:05 1664038
/usr/lib/libaviplayavutil-0.7.so.0.0.47
00721000-00722000 rw-p 00007000 08:05 1664038
/usr/lib/libaviplayavutil-0.7.so.0.0.47
00722000-00724000 rw-p 00000000 00:00 0
00724000-00727000 r-xp 00000000 08:05 1664188
/usr/lib/libaviplayvidix-0.7.so.0.0.47
00727000-00728000 rw-p 00002000 08:05 1664188
/usr/lib/libaviplayvidix-0.7.so.0.0.47
00728000-00729000 rw-p 00000000 00:00 0
00729000-0072b000 r-xp 00000000 08:05 2284751
/usr/lib/pd/extra/flatspace/pmpd.pd_linux
0072b000-0072c000 r--p 00002000 08:05 2284751
/usr/lib/pd/extra/flatspace/pmpd.pd_linux
0072c000-0072d000 rw-p 00003000 08:05 2284751
/usr/lib/pd/extra/flatspace/pmpd.pd_linux
0072e000-00745000 r-xp 00000000 08:05 1661426    /usr/lib/libICE.so.6.3.0
00745000-00746000 r--p 00016000 08:05 1661426    /usr/lib/libICE.so.6.3.0
00746000-00747000 rw-p 00017000 08:05 1661426    /usr/lib/libICE.so.6.3.0
00747000-00749000 rw-p 00000000 00:00 0
00749000-00765000 r-xp 00000000 08:05 1221738    /lib/libgcc_s.so.1
00765000-00766000 r--p 0001b000 08:05 1221738    /lib/libgcc_s.so.1
00766000-00767000 rw-p 0001c000 08:05 1221738    /lib/libgcc_s.so.1
00767000-0077f000 r-xp 00000000 08:05 1664186
/usr/lib/libaviplayswscale-0.7.so.0.0.47
0077f000-00780000 rw-p 00018000 08:05 1664186
/usr/lib/libaviplayswscale-0.7.so.0.0.47
00780000-00789000 r-xp 00000000 08:05 1666209    /usr/lib/libXi.so.6.0.0
Program received signal SIGABRT, Aborted.




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