[MPlayer-dev-eng] Fix build with --enable-vf-lavfi

[Diego Biurrun]

On Sat, Feb 04, 2012 at 10:42:10PM +0100, Clément Bœsch wrote:
> 
> I saw on mplayer-user a build issue with --enable-vf-lavfi, and since I'm
> somehow at fault because of the new libswresample dependency, here is a
> patch.
> 
> I didn't test it thoroughly though (only the default static in-place build
> method is tested).  Also, I'm not sure what happens if we try to link with
> libav since they still stick with the old API…

It will fail to find -lswresample and not link of course.

> --- Makefile	(revision 34652)
> +++ Makefile	(working copy)
> @@ -689,7 +689,7 @@
>  
>  # (linking) order matters for these libraries
> -FFMPEGPARTS = libpostproc libswscale libavfilter libavformat libavcodec libavutil
> +FFMPEGPARTS = libpostproc libswscale libavfilter libavformat libavcodec libavutil libswresample

That works?  libswresample does not have libavutil dependencies?
I wrote the comment above for a reason..

> --- configure	(revision 34652)
> +++ configure	(working copy)
> @@ -6715,12 +6715,12 @@
>  elif test "$ffmpeg_so" = auto ; then
>    ffmpeg_so=no
>    if $_pkg_config --exists libavutil ; then
> -    inc_ffmpeg=$($_pkg_config --cflags libpostproc libswscale libavformat libavcodec libavutil)
> -    ld_tmp=$($_pkg_config --libs libpostproc libswscale libavformat libavcodec libavutil)
> +    inc_ffmpeg=$($_pkg_config --cflags libpostproc libswscale libavformat libavcodec libavutil libswresample)
> +    ld_tmp=$($_pkg_config --libs libpostproc libswscale libavformat libavcodec libavutil libswresample)
>      header_check libavutil/avutil.h $inc_ffmpeg $ld_tmp &&
>        extra_ldflags="$extra_ldflags $ld_tmp" && ffmpeg_so=yes && ffmpeg=yes
> -  elif header_check libavutil/avutil.h -lpostproc -lswscale -lavformat -lavcodec -lavutil ; then
> -    extra_ldflags="$extra_ldflags -lpostproc -lswscale -lavformat -lavcodec -lavutil"
> +  elif header_check libavutil/avutil.h -lpostproc -lswscale -lavformat -lavcodec -lavutil -lswresample; then
> +    extra_ldflags="$extra_ldflags -lpostproc -lswscale -lavformat -lavcodec -lavutil -lswresample"
>      ffmpeg_so=yes
>      ffmpeg=yes
>    fi

As Reinhard said, you would have to check if the lib you link against
exists if you want to support libav.

Diego