Building/linking your own module

GNU Radio
1

Hi everyone,

I am trying to implement a video player block for gnuradio, which uses
various
ffmpeg libraries. Unfortunately, I’ve been having difficulty linking to
the
ffmpeg libraries within
the gnuradio framework.

My approach so far has been to include the libraries in the
‘module/lib/Makefile.am’
as follows:

…
libgnuradio_module_la_LIBADD =
-lavformat -lavcodec -lavutil -lswscale
$(GNURADIO_CORE_LA)
…

where ‘-lavformat -lavcodec -lavutil -lswscale’ are the libs I need to
link
against.

When compiling I get errors of the following type:
/usr/local/src/gnuradio/gr-module/lib/.libs/libgnuradio-module.so:
undefined
reference to `av_register_all()’

Note that the libraries are static and installed properly.

Any help on how I should go about linking this would be greatly
appreciated.

Thanks,
Demijan

2

I am following up on my previous post (see below). I’ve noticed that if
I
add
a -static flag under _LDFLAGS in Makefile.am, it compiles fine.

I am wondering if it’s ok to compile with the -static flag.

In an attempt to be able to compile without the static flag, I
reinstalled
the ffmpeg libs with the --enable-shared option, so the .so libs are
installed
as well. But even with that if I do ‘make’ without the ‘-static’ flag in
Makefile.am,
it fails to compile, much like it did earlier…

Anyone knows what might be happening?

Demijan