[FFmpeg-devel] [PATCH]Fix dxva2 detection

Michael Niedermayer michaelni at gmx.at
Tue Sep 13 02:51:54 CEST 2011

On Mon, Sep 12, 2011 at 09:20:08PM -0300, Ramiro Polla wrote:
> Hi Carl,
> On Mon, Sep 12, 2011 at 6:56 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> > I needed this patch on Win64, any objections?
> > See libavcodec/dxva2_internal.h, line 26.
> >
> > Please comment, Carl Eugen
> The only issue I know of while detecting dxva2 with mingw-w64 is
> caused by this line:
> check_struct dxva2api.h DXVA_PictureParameters wDecodedPictureIndex
> This is related to dxva2api.h provided by videolan. This struct was
> added at some point at the same time vc1 dxva2 was added to FFmpeg. To
> prevent builds failing when people used the old version of dxva2api.h,
> this check was added to configure in r21444.
> I don't think anyone still has that old version of dxva2api.h from
> videolan. mingw-w64 should be used instead of mingw32, and mingw-w64
> contains a proper dxva2api.h, which is properly detected by configure
> as-is. The only issue is that vc1 dxva2 is not enabled in mingw-w64
> because that check lacks -D_WIN32_WINNT=0x0600. I suggest that check
> be removed (r21444 be reverted).

if you want me to revert it, just say so

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Breaking DRM is a little like attempting to break through a door even
though the window is wide open and the only thing in the house is a bunch
of things you dont want and which you would get tomorrow for free anyway
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