Re: [mpeg2-dev] Exception in mpeg2_idct_copy_sse2

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Hi David,

Thanks. Those DLL's work and do indeed have SSE2 acceleration.
(SSE2 produces approx 30% speed increase on my machine).

But it is frustrating that I can't get my own build working in Visual
Studio, as I would prefer to use a static library rather than a DLL.

Thanks,

Matt

On 5 May 2010 02:46, Hoyt, David <ho...@ll...> wrote:

>  You can get a copy built by the OSSBuild folks:
>
>
>
> http://code.google.com/p/ossbuild/
>
>
>
> Download and install the GPL version and then the GPL SDK and you’ll have
> the headers and libs you need. I’m unsure if it’s built w/ SSE2 or not.
>
> My work’s filter likes to put asterisks (*) in URLs to prevent people from
> clicking on just any link they find in an email, so if you see one, take it
> out.
>
>
>
> *From:* Matthew McGinity [mailto:mmc...@gm...]
> *Sent:* Tuesday, May 04, 2010 1:22 AM
> *To:* Keith Winstein
> *Cc:* lib...@li...
> *Subject:* Re: [mpeg2-dev] Exception in mpeg2_idct_copy_sse2
>
>
>
> Hi,
>
> Can anyone confirm that they have SSE2 acceleration from a visual studio
> 2005 build of libmpeg2?
> How were those .obj files generated?
>
> Or perhaps someone could provide me with a release build of libmpeg2.lib
> 0.5.1 ??
>
> Any ideas whatsoever greatly appreciated!
>
> Thanks
>
> Matt
>
> --
> Matthew McGinity
> iCinema Centre for Interactive Cinema Research
> University of New South Wales, Sydney, Australia
> http://*www.*icinema.unsw.edu.au
> Tel: 0405 115 322
>
>  On 2 May 2010 17:46, Matthew McGinity <mmc...@gm...> wrote:
>
> Hi Keith,
>
> Just resending last mail without attachment so it's not bounced by the
> mailing-list.
>
>
> I've compiled both sample1 and mpeg2dec and they both suffer the same
> problem.
> I've compiled version 0.4.1 and that works fine - which is to be
> expected as the SSE2 support was introduced in version .5
>
> > I didn't understand your remark about "I assume the source files for the
> > .obj files in vc++ cannot be built with VC++". Are you saying you're not
> > compiling libmpeg2 from the source code and just using somebody else's
> > build?
>
> I'm building my own version. My project has these source files:
>
> libmpeg2\alloc.c
> libmpeg2\decode.c
> libmpeg2\header.c
> libmpeg2\idct.c
> libmpeg2\motion_comp.c
> libmpeg2\motion_comp_vis.c
> libmpeg2\slice.c
> libmpeg2\convert\rgb.c
> libmpeg2\convert\rgb_vis.c
> libmpeg2\convert\uyvy.c
>
> and these object files:
> vc++\cpu_accel.obj
> vc++\cpu_state.obj
> vc++\idct_mmx.obj
> vc++\motion_comp_mmx.obj
> vc++\rgb_mmx.obj
>
> I tried compiling these .obj files from their corresponding source .c
> files but without success -  I don't think they're intended to be
> built with vc++.
>
> The only changes I've made is removing #define restrict __restrict from
> config.h
>
> I can easily email out my complete solution should anyone with windows
> and Visual Studio 2005 be willing to take a look.
> (I don't think I can send attachments to this forum)
>
> Cheers,
> Matt
>
>
> > On 2 May 2010 02:43, Keith Winstein <ke...@mi...> wrote:
> >> Hi Matthew,
> >>
> >> We're here. Unfortunately I don't have Windows and would have a hard
> time
> >> trying to reproduce this problem for you. (It works fine for me with gcc
> on
> >> Linux; I recognize that's not very helpful to know.)
> >>
> >> Are you able to compile the "mpeg2dec" program that ships with libmpeg2?
> >> Does it also bomb out like this?
> >>
> >> I didn't understand your remark about "I assume the source files for the
> >> .obj files in vc++ cannot be built with VC++". Are you saying you're not
> >> compiling libmpeg2 from the source code and just using somebody else's
> >> build? Sorry for the confusion.
> >>
> >> Regards,
> >> Keith
> >>
> >> On Sat, 1 May 2010, Matthew McGinity wrote:
> >>
> >>> Hi,
> >>>
> >>> First question - is there anyone out there? Is this forum still alive?
> >>>
> >>> I have libmpeg2 version 5.0.1 compiling in VS2005.
> >>> My test file, based on sample5.c, works perfectly, provided I don't
> enable
> >>> SSE2.
> >>>
> >>> That is, if I change mpeg2_init() to use
> >>>  mpeg2_accel(0);
> >>> or
> >>>  mpeg2_accel(MPEG2_ACCEL_X86_MMX);
> >>> or
> >>>  mpeg2_accel(MPEG2_ACCEL_X86_MMXEXT);
> >>> everything works fine.
> >>>
> >>> However, if I allow auto-detection
> >>>  mpeg2_accel(MPEG2_ACCEL_DETECT);
> >>> it chooses sse2 acceleration and I get an exception on the very first
> >>> call to mpeg2_idct_copy in slice_intra_DCT in mpeg2_slice:
> >>>
> >>> "First-chance exception at 0x00445fa3 in icMPEG2Test.exe: 0xC0000005:
> >>> Access violation reading location 0xffffffff."
> >>>
> >>> Stack location is:  _mpeg2_idct_copy_sse2()  + 0x13 bytes
> >>>
> >>> In my project, I'm linking to all the .obj files provided in directory
> >>> \libmpeg2\vc++
> >>>
> >>> Not quite sure how to proceed. I assume the source files for the .obj
> >>> files in vc++
> >>> cannot be built with VC++. (I tried renaming __asm__ to __asm and
> >>> __volatile__ to volatile, but it didn't get me far).
> >>>
> >>> Any advice appreciated,
> >>>
> >>> Matt
> >>> - libmpeg2 v5.0.1, Windows XP, Intel Core2 Quad CPU Q9400, Visual
> Studio
> >>> 2005
> >>>
> >>>
> >>>
> >>> --
> >>> Matthew McGinity
> >>> iCinema Centre for Interactive Cinema Research
> >>> University of New South Wales, Sydney, Australia
> >>> http://*www.*icinema.unsw.edu.au
> >>> Tel: 0405 115 322
> >>>
> >>>
> >>>
> ------------------------------------------------------------------------------
> >>> _______________________________________________
> >>> Libmpeg2-devel mailing list
> >>> Lib...@li...
> >>> https://*lists.sourceforge.net/lists/listinfo/libmpeg2-devel
> >>>
> >>
> >
>
>
>