Linux: preload ffmpeg in the zygote.

Linux: preload ffmpeg in the zygote.

When using the sandbox, the renderer cannot load the ffmpeg shared
objects from disk. So we load them in the zygote before the sandbox is
started.

(Note that this doesn't get media working, but it's a start.)

BUG=18329

[awong, 2009-08-04 01:17:10]

LGTM

with one question.

http://codereview.chromium.org/159841/diff/1/3
File third_party/ffmpeg/ffmpeg.gyp (right):

http://codereview.chromium.org/159841/diff/1/3#newcode26
Line 26: 'avutil-50.sigs',
what?  really?  What happens if it's not?  I didn't think it should matter...

[agl, 2009-08-04 01:18:46]

http://codereview.chromium.org/159841/diff/1/3
File third_party/ffmpeg/ffmpeg.gyp (right):

http://codereview.chromium.org/159841/diff/1/3#newcode26
Line 26: 'avutil-50.sigs',
On 2009/08/04 01:17:10, awong wrote:
> what?  really?  What happens if it's not?  I didn't think it should matter...

It doesn't load otherwise. avcodec depends on avutil. If avutil isn't loaded
first then libc will try to find avutil using the order listed in the manpage.
Since I don't have an system avutil which works, it fails to load avcodec.

[awong, 2009-08-04 01:21:12]

On Mon, Aug 3, 2009 at 6:18 PM, <agl@chromium.org> wrote:

>
> http://codereview.chromium.org/159841/diff/1/3
> File third_party/ffmpeg/ffmpeg.gyp (right):
>
> http://codereview.chromium.org/159841/diff/1/3#newcode26
> Line 26: 'avutil-50.sigs',
> On 2009/08/04 01:17:10, awong wrote:
>
>> what?  really?  What happens if it's not?  I didn't think it should
>>
> matter...
>
> It doesn't load otherwise. avcodec depends on avutil. If avutil isn't
> loaded first then libc will try to find avutil using the order listed in
> the manpage. Since I don't have an system avutil which works, it fails
> to load avcodec.


I thought that's why chrome-wrapper set LD_LIBRARY_PATH so that the
libraries could self-resolve.  Making it work independent of the
LD_LIBRARY_PATH settings is nice though.

-Albert

[awong, 2009-08-06 18:39:34]

On 2009/08/04 01:21:12, awong wrote:
> On Mon, Aug 3, 2009 at 6:18 PM, <agl@chromium.org> wrote:
> 
> >
> > http://codereview.chromium.org/159841/diff/1/3
> > File third_party/ffmpeg/ffmpeg.gyp (right):
> >
> > http://codereview.chromium.org/159841/diff/1/3#newcode26
> > Line 26: 'avutil-50.sigs',
> > On 2009/08/04 01:17:10, awong wrote:
> >
> >> what?  really?  What happens if it's not?  I didn't think it should
> >>
> > matter...
> >
> > It doesn't load otherwise. avcodec depends on avutil. If avutil isn't
> > loaded first then libc will try to find avutil using the order listed in
> > the manpage. Since I don't have an system avutil which works, it fails
> > to load avcodec.
> 
> 
> I thought that's why chrome-wrapper set LD_LIBRARY_PATH so that the
> libraries could self-resolve.  Making it work independent of the
> LD_LIBRARY_PATH settings is nice though.
> 
> -Albert
> 

I think this got checked in...should this be closed?