[FFmpeg-devel] ffmpeg for bluefin bug

[Diego Biurrun]

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

> 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.

> But this new one doesn't.  I have tried both with and without swscale  
> with the same results.

Then the bug may be in libavcodec instead of libswscale.

Diego