Re: [mpeg2-dev] Exception in mpeg2_idct_copy_sse2

[Keith W. <ke...@MI...>]

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
>
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