[FFmpeg-devel] GSoC project (JPEG 2000)

[zhentan feng]

Hi

On Sun, Mar 27, 2011 at 1:46 PM, rukhsana afroz <rukhsana.afroz at gmail.com>wrote:

> On Sat, Mar 26, 2011 at 10:10 PM, Peter Ross <pross at xvid.org> wrote:
>
> >
> > The FFmpeg build system forbids the use of global functions, without a
> > previous
> > prototype declaration. To fix this, you need to declare a
> > 'ff_j2k_init_tier1_luts'
> > prototype somewhere _or_ make the function static.
> >
> > From the gcc manpage:
> >   -Wmissing-prototypes (C and Objective-C only)
> >       Warn if a global function is defined without a previous prototype
> > declaration.  This warning is issued even if
> >       the definition itself provides a prototype.  The aim is to detect
> > global functions that fail to be declared in
> >       header files.
> >
>
> Thanks Peter for your help. I made static this file in both declaration and
> implementation. Now, I got rid of this problem. While linking jpeg 2000
> with
> ffmpeg, i got the following error:
>
> LD    ffmpeg_g
>
> /ubc/ece/home/vl/grads/rukhsana/gsoc11/ffmpeg/libavcodec/libavcodec.a(allcodecs.o):
> In function `avcodec_register_all':
> /ubc/ece/home/vl/grads/rukhsana/gsoc11/ffmpeg/libavcodec/allcodecs.c:128:
> undefined reference to `ff_jpeg2000_decoder'
> collect2: ld returned 1 exit status
> make: *** [ffmpeg_g] Error 1
>
> If anybody could help getting rid of it, that would be great.
>
>
This is link error.
I think you should modify the libavcodec/Makefile like this:
http://wiki.multimedia.cx/index.php?title=FFmpeg_codec_HOWTO#libavcodec.2FMakefile

<http://wiki.multimedia.cx/index.php?title=FFmpeg_codec_HOWTO#libavcodec.2FMakefile>
zhentan
-- 
Best wishes~