building a gst plugin
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Hi all,
I was going through the Plugin writers guide, and I sincerely feel that the chapter 9 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 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? Thanks Br, V ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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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, 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 > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > ------------------------------------------------------------------------ > > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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On Tue, Mar 16, 2010 at 2:09 PM, Stefan Kost <[hidden email]> wrote: hi, The problem is fixed, The problem was in the way I was building the plugin, the macro VERSION was not defined in the generated filter code so I had declared it as a int leading to the crash. (I had ignored the gcc warning and later realized this to be a string.) Probably the template plugin code can have a definition of macro VERSION, so that the generated filter is compilable out of the box(?). Thanks.
------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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