[gst-devel] Issue: Creating a sample Gst plugin

Wed Nov 21 12:05:50 CET 2007

Hello all,

PROBLEM:
Unable to build a Gst Plugin.
I am trying to build a filter plugin lib (.so) with a corresponding header
and put it in /lib/gstreamer-0.10/

WHAT DID I DO?
1. Downloaded gst-template folder.
2. make_element Wow ( generated gstwow.h & gstwow.c)
3. ./configure  ( assuming, this is what we should do.. just like building
gstreamer src)
4. make

WHERE IS THE PROBLEM NOW?

Step #3 above fails (please see shell logs below). A file called Makefile.in
seems to be missing.

____________________________________________________________________________

[root at localhost gst-plugin]#
[root at localhost gst-plugin]#
[root at localhost gst-plugin]#
[root at localhost gst-plugin]# ls
aclocal.m4      comedi        configure     gst-autogen.sh  m4           src
autogen.sh      config.guess  configure.ac  INSTALL         Makefile.am
tools
autom4te.cache  config.h.in   COPYING       install-sh      missing
autoregen.sh    config.sub    cvignore      ltmain.sh       plplot
[root at localhost gst-plugin]# pwd
/root/project_files/code_sample/gst-template/gst-plugin
[root at localhost gst-plugin]# ./configure
configure: configuring gst-plugin for development with nano 1
checking whether to enable maintainer-specific portions of Makefiles... no
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking for style of include used by make... GNU
checking dependency style of gcc... none
checking build system type... i686-redhat-linux-gnu
checking host system type... i686-redhat-linux-gnu
checking for a sed that does not truncate output... /bin/sed
checking for egrep... grep -E
checking for ld used by gcc... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for /usr/bin/ld option to reload object files... -r
checking for BSD-compatible nm... /usr/bin/nm -B
checking whether ln -s works... yes
checking how to recognise dependent libraries... pass_all
checking how to run the C preprocessor... gcc -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking dlfcn.h usability... yes
checking dlfcn.h presence... yes
checking for dlfcn.h... yes
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking dependency style of g++... none
checking how to run the C++ preprocessor... g++ -E
checking for g77... g77
checking whether we are using the GNU Fortran 77 compiler... yes
checking whether g77 accepts -g... yes
checking the maximum length of command line arguments... 32768
checking command to parse /usr/bin/nm -B output from gcc object... ok
checking for objdir... .libs
checking for ar... ar
checking for ranlib... ranlib
checking for strip... strip
checking if gcc supports -fno-rtti -fno-exceptions... no
checking for gcc option to produce PIC... -fPIC
checking if gcc PIC flag -fPIC works... yes
checking if gcc static flag -static works... yes
checking if gcc supports -c -o file.o... yes
checking whether the gcc linker (/usr/bin/ld) supports shared libraries...
yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
configure: creating libtool
appending configuration tag "CXX" to libtool
checking for ld used by g++... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking whether the g++ linker (/usr/bin/ld) supports shared libraries...
yes
checking for g++ option to produce PIC... -fPIC
checking if g++ PIC flag -fPIC works... yes
checking if g++ static flag -static works... yes
checking if g++ supports -c -o file.o... yes
checking whether the g++ linker (/usr/bin/ld) supports shared libraries...
yes
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
appending configuration tag "F77" to libtool
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for g77 option to produce PIC... -fPIC
checking if g77 PIC flag -fPIC works... yes
checking if g77 static flag -static works... yes
checking if g77 supports -c -o file.o... yes
checking whether the g77 linker (/usr/bin/ld) supports shared libraries...
yes
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking to see if compiler understands -Wall... yes
checking to see if compiler understands -Werror... yes
checking for pkg-config... yes
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for GST... yes
checking for GST_BASE... yes
checking for GSTPB_BASE... yes
checking for GSTCTRL... yes
configure: creating ./config.status
config.status: creating Makefile
config.status: error: cannot find input file: Makefile.in
[root at localhost gst-plugin]#
[root at localhost gst-plugin]#
[root at localhost gst-plugin]# make
make: *** No targets specified and no makefile found.  Stop.
__________________________________________________________________________

QUESTIONS:
1. How to build the new plugin code generated using ../tools/make_elements ?

2. How to let gst-inpsect & gst-launch (and other tools) know that I have
created a plugin?

CONCERN:

The plugin writer's Guide form gstreamer.freedesktop.org seems to be missing
some pages :-(. 

I referred to previous related mail archives. It has only added to confusion.
Please, help me out of this..

Thanks and regards,
Sharath

PS: Please, ignore the DISCLAIMER! Sorry about this!

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