[FFmpeg-devel] ffmpeg for bluefin bug

[Diego Biurrun]

On Wed, Mar 18, 2009 at 04:57:16PM -0700, Adam Dershowitz, Ph.D., P.E. wrote:
> 
> On Mar 17, 2009, at 4:54 PM, Diego Biurrun wrote:
> 
> > On Tue, Mar 17, 2009 at 01:40:36PM -0700, Adam Dershowitz, Ph.D.,  
> > P.E. wrote:
> >>
> >> On Mar 17, 2009, at 5:06 AM, Diego Biurrun wrote:
> >>
> >>> On Mon, Mar 16, 2009 at 02:58:37PM -0700, Adam Dershowitz wrote:
> >>>> I was trying to compile ffmpeg 0.5 on the Blackfin, with  
> >>>> uclinux.  I
> >>>> found a bug and then a fix.
> >>>> I am using --enable-swscale and when it tries to link, I get a link
> >>>> error:
> >>>> libswscale.so undefined reference to
> >>>> '_sws_ff_bfin_yuv2rgb_get_func_ptr'
> >>>> Sure enough this function is used in libswscale/yuv2rgb.c:
> >>>>
> >>>> lines 461:
> >>>>
> >>>> #if ARCH_BFIN
> >>>>    if (c->flags & SWS_CPU_CAPS_BFIN)
> >>>>        t = sws_ff_bfin_yuv2rgb_get_func_ptr(c);
> >>>> #endif
> >>>>
> >>>> But I greped through the code and I can't find that function  
> >>>> defined
> >>>> anywhere.  In fact, I only see it that single time in the code.
> >>>>
> >>>> I asked around some and was told that:
> >>>> ff_bfin_yuv2rgb_get_func_ptr  in yuv2rgb_bfin.c is the correct
> >>>> function.
> >>>>
> >>>> So one of these needs to be changed so that they have the same  
> >>>> name.
> >>>> I am not sure if this is the best place to report this bug and fix.
> >>>> If not, please let me know where might be a better place.
> >>>
> >>> Fixed.
> >>
> >> Thanks....but.  Now ti compiles and starts to run on my BF527 EZkit
> >> board.  I get the normal startup message and I get info on the
> >> streams.  Before any frames get converted I get an "illegal
> >> instruction" and a core dump.
> >> Any suggestions about this?
> >
> > Gather the relevant information and send us a bug report:
> >
> > http://www.ffmpeg.org/bugreports.html
> 
> I just registered and tried to.  But I keep getting an error when I  
> click submit that says:
> An error has occurred
> A problem was encountered processing your request.  The tracker  
> maintainers have been notified of the problem.
> 
> Am I doing something wrong, or is something wrong with the tracker?

I think it's the tracker that is having issues.

> >> Given the above error it looks like no one has actually tested the
> >> blackfin specific code. I had been running a much older version of
> >> ffmpeg from blackfin.uclinux.com that does run.
> >
> > Marc Hoffman, the author of the blackfin code in FFmpeg, used to work
> > for Analog Devices, I'm pretty sure the code must have worked at some
> > point on some machine.
> 
> I have also been talking to some people at blackfin.uclinux.org.  That  
> site has a few people from AD who post (maybe support the site?).  I  
> have not seen any posting from Hoffman in a while, so might not be  
> working on this any longer.

Marc no longer works for AD.  I know this for sure.

> But the current release of Linux on that site includes ffmpeg- 
> svn-11114 and that version does compile and run.

Can you try to find the revision that broke?

Diego