[gst-devel] building a gst plugin

[Stefan Kost]

hi,

vineeth wrote:
> Hi all,
>   I was going through the Plugin writers guide, and I sincerely feel
> that the chapter 9
> <http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/chapter-building-testapp.html>
> should also describe how to build the test plugin "my_filter"
>   that was described all the way along and also being used in the test
> app. BTW, I used the following command to do this,
>    gcc  `pkg-config --libs --cflags gstreamer-0.10` 
> gstexamplefilter.c --shared -o
> ~/.gstreamer-0.10/plugins/libexamplefilter.so
>
>   But was unable to load it,
I added a paragraph to
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/part-building.html
it will show up after next release.

>
>   I got the following error message, when I ran it through valgrind :
>
> ==3068== Memcheck, a memory error detector.
> ==3068== Copyright (C) 2002-2008, and GNU GPL'd, by Julian Seward et al.
> ==3068== Using LibVEX rev 1884, a library for dynamic binary translation.
> ==3068== Copyright (C) 2004-2008, and GNU GPL'd, by OpenWorks LLP.
> ==3068== Using valgrind-3.4.1-Debian, a dynamic binary instrumentation
> framework.
> ==3068== Copyright (C) 2000-2008, and GNU GPL'd, by Julian Seward et al.
> ==3068== For more details, rerun with: -v
> ==3068==
> ==3069== Invalid read of size 1
> ==3069==    at 0x42DC3D7: g_str_hash (in /usr/lib/libglib-2.0.so.0.2000.1)
> ==3069==    by 0x42AA3FA: g_hash_table_lookup (in
> /usr/lib/libglib-2.0.so.0.2000.1)
> ==3069==    by 0x42A3EB6: g_intern_string (in
> /usr/lib/libglib-2.0.so.0.2000.1)
> ==3069==    by 0x4095A48: (within /usr/lib/libgstreamer-0.10.so.0.19.0)
> ==3069==    by 0x4096F51: gst_plugin_load_file (in
> /usr/lib/libgstreamer-0.10.so.0.19.0)
> ==3069==    by 0x40A0B8E: (within /usr/lib/libgstreamer-0.10.so.0.19.0)
> ==3069==    by 0x40A0CA7: gst_registry_scan_path (in
> /usr/lib/libgstreamer-0.10.so.0.19.0)
> ==3069==    by 0x40547B2: (within /usr/lib/libgstreamer-0.10.so.0.19.0)
> ==3069==    by 0x40551AC: (within /usr/lib/libgstreamer-0.10.so.0.19.0)
> ==3069==    by 0x40568FA: (within /usr/lib/libgstreamer-0.10.so.0.19.0)
> ==3069==    by 0x42C7DCA: g_option_context_parse (in
> /usr/lib/libglib-2.0.so.0.2000.1)
> ==3069==    by 0x4055FA5: gst_init_check (in
> /usr/lib/libgstreamer-0.10.so.0.19.0)
> ==3069==  Address 0x1 is not stack'd, malloc'd or (recently) free'd
>
> ERROR: Caught a segmentation fault while loading plugin file:
> /home/pubuntu/.gstreamer-0.10/plugins/libexamplefilter.so
>
> Please either:
> - remove it and restart.
> - run with --gst-disable-segtrap and debug.
>                     ....
>
>
>  Any idea about what is going wrong?

what backtrace are you getting when you run this under gdb, e.g. via:
gdb --args gst-inspect-0.10 --gst-disable-registry-fork examplefilter

Stefan

>  Thanks
>
> Br,
> V
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