[SDL] SDL Digest, Vol 12, Issue 32

renjith kumar renjithkumar at gmail.com
Tue Dec 25 23:12:24 PST 2007


Hi ,

I am new to sdl and I wish to work more with SDL
I have a requirement of Displaying multiple video Streams (16 nos)
in to a single Window with the overlay Support.
I am thinking in this way, because I believe creating multiple window
(Each window for each Video In Channels ) can not be supported with SDL,
As I failed.

I am creating 16 Threads in the main file , each for Each channel capture.
each thread will create its own overlay and display into diff. rectangle in
SDL Surface.

But this thread Creation end in Fail by giving X lib errors, I need
threading as the performance
w/o threading is Very Poor.
Please Share your ideas.
I get X lib errors as follows..


Open board... done.
Initialize board... done.
Set group slice controls... done.
press ESC to Quit.
Create capturing threads... 0 done.
Start capture video transfer...
0 *** glibc detected *** ./sample: free(): invalid pointer: 0xbf8242b8 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7c377cd]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb7c3ae30]
/usr/lib/libSDL-1.2.so.0(SDL_WaitThread+0x44)[0xb7e29e44]
./sample[0x8049b02]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc)[0xb7be5ebc]
./sample[0x8048fc1]
======= Memory map: ========
08048000-0804c000 r-xp 00000000 08:06 979674     /opt/Hicap/hicap_sdk/sample
0804c000-0804d000 rw-p 00003000 08:06 979674     /opt/Hicap/hicap_sdk/sample
0804d000-08e15000 rw-p 0804d000 00:00 0          [heap]
b54fb000-b54fc000 ---p b54fb000 00:00 0
b54fc000-b5cfc000 rw-p b54fc000 00:00 0
b5cfc000-b5cfd000 ---p b5cfc000 00:00 0
b5cfd000-b64fd000 rw-p b5cfd000 00:00 0
b65ca000-b65d5000 r-xp 00000000 08:06 1697344    /lib/libgcc_s.so.1
b65d5000-b65d6000 rw-p 0000a000 08:06 1697344    /lib/libgcc_s.so.1
b65d6000-b65d7000 ---p b65d6000 00:00 0
b65d7000-b6dd7000 rw-p b65d7000 00:00 0
b6dd7000-b6dec000 rw-s 00000000 00:08 3244051    /SYSV00000000 (deleted)
b6dec000-b6df0000 r-xp 00000000 08:06 1437451    /usr/lib/libXfixes.so.3.1.0
b6df0000-b6df1000 rw-p 00003000 08:06 1437451    /usr/lib/libXfixes.so.3.1.0
b6df1000-b6df9000 r-xp 00000000 08:06 1437441
/usr/lib/libXcursor.so.1.0.2
b6df9000-b6dfa000 rw-p 00007000 08:06 1437441
/usr/lib/libXcursor.so.1.0.2
b6dfa000-b6dff000 r-xp 00000000 08:06 1437469    /usr/lib/libXrandr.so.2.1.0
b6dff000-b6e00000 rw-p 00005000 08:06 1437469    /usr/lib/libXrandr.so.2.1.0
b6e00000-b6e07000 r-xp 00000000 08:06 1437471
/usr/lib/libXrender.so.1.3.0
b6e07000-b6e08000 rw-p 00006000 08:06 1437471
/usr/lib/libXrender.so.1.3.0
b6e08000-b7a68000 rw-s 00000000 00:0d 13502      /dev/video0
b7a68000-b7a6a000 rw-p b7a68000 00:00 0
b7a6a000-b7a6e000 r-xp 00000000 08:06 1437445    /usr/lib/libXdmcp.so.6.0.0
b7a6e000-b7a6f000 rw-p 00003000 08:06 1437445    /usr/lib/libXdmcp.so.6.0.0
b7a6f000-b7a71000 r-xp 00000000 08:06 1437434    /usr/lib/libXau.so.6.0.0
b7a71000-b7a72000 rw-p 00001000 08:06 1437434    /usr/lib/libXau.so.6.0.0
b7a72000-b7a73000 rw-p b7a72000 00:00 0
b7a73000-b7a81000 r-xp 00000000 08:06 1437584    /usr/lib/libdirect-
0.9.so.25.0.0
b7a81000-b7a82000 rw-p 0000e000 08:06 1437584    /usr/lib/libdirect-
0.9.so.25.0.0
b7a82000-b7a87000 r-xp 00000000 08:06 1437652    /usr/lib/libfusion-
0.9.so.25.0.0
b7a87000-b7a88000 rw-p 00004000 08:06 1437652    /usr/lib/libfusion-
0.9.so.25.0.0
b7a88000-b7add000 r-xp 00000000 08:06 1437586    /usr/lib/libdirectfb-
0.9.so.25.0.0
b7add000-b7adf000 rw-p 00055000 08:06 1437586    /usr/lib/libdirectfb-
0.9.so.25.0.0
b7adf000-b7ae1000 r-xp 00000000 08:06 1731208    /lib/tls/i686/cmov/libdl-
2.5.so
b7ae1000-b7ae3000 rw-p 00001000 08:06 1731208    /lib/tls/i686/cmov/libdl-
2.5.so
b7ae3000-b7b08000 r-xp 00000000 08:06 1731210    /lib/tls/i686/cmov/libm-
2.5.so
b7b08000-b7b0a000 rw-p 00024000 08:06 1731210    /lib/tls/i686/cmov/libm-
2.5.so
b7b0a000-b7bca000 r-xp 00000000 08:06 1437499    /usr/lib/libasound.so.2.0.0
b7bca000-b7bcf000 rw-p 000bf000 08:06 1437499    /usr/lib/libasound.so.2.0.0
b7bcf000-b7bd0000 rw-p b7bcf000 00:00 0
b7bd0000-b7d0b000 r-xp 00000000 08:06 1731202    /lib/tls/i686/cmov/libc-
2.5.so
b7d0b000-b7d0c000 r--p 0013b000 08:06 1731202    /lib/tls/i686/cmov/libc-
2.5.so
b7d0c000-b7d0e000 rw-p 0013c000 08:06 1731202    /lib/tls/i686/cmov/libc-
2.5.so
b7d0e000-b7d11000 rw-p b7d0e000 00:00 0
b7d11000-b7d15000 r-xp 00000000 08:06 1437485
/usr/lib/libXxf86vm.so.1.0.0
b7d15000-b7d16000 rw-p 00003000 08:06 1437485
/usr/lib/libXxf86vm.so.1.0.0
b7d16000-b7d1a000 r-xp 00000000 08:06 1437481
/usr/lib/libXxf86dga.so.1.0.0
b7d1a000-b7d1b000 rw-p 00004000 08:06 1437481
/usr/lib/libXxf86dga.so.1.0.0
b7d1b000-b7e08000 r-xp 00000000 08:06 1437428    /usr/lib/libX11.so.6.2.0
b7e08000-b7e0c000 rw-p 000ed000 08:06 1437428    /usr/lib/libX11.so.6.2.0
b7e0c000-b7e19000 r-xp 00000000 08:06 1437449    /usr/lib/libXext.so.6.4.0
b7e19000-b7e1a000 rw-p 0000d000 08:06 1437449    /usr/lib/libXext.so.6.4.0
b7e1a000-bAborted (core dumped)
#####
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