Question on release 1.12: How to enable MSDK on Windows?

[Scott D Phillips]

Hi Martin,

On Fri, May 05, 2017 at 08:06:05AM +0200, Martin Maurer wrote:
> Hello,
> 
> first many thanks for the new release 1.12 of GStreamer.
> 
> In the release notes ( https://gstreamer.freedesktop.org/releases/1.12/ )
> there are the following entries:
> 
> In the highlights:
> 
> "new |msdk| plugin for Intel's Media SDK for hardware-accelerated video
> encoding and decoding on Intel graphics hardware on Windows or Linux."
> 
> In new elements:
> 
> "msdk: new plugin for Intel's Media SDK for hardware-accelerated video
> encoding and decoding on Intel graphics hardware on Windows or Linux. This
> includes an H.264 encoder/decoder (|msdkh264dec|, |msdkh264enc|), an H.265
> encoder/decoder (|msdkh265dec|, |msdkh265enc|), an MJPEG encoder/encoder
> (|msdkmjpegdec|, |msdkmjpegenc|), an MPEG-2 video encoder (|msdkmpeg2enc|)
> and a VP8 encoder (|msdkvp8enc|)."
> 
> Can you describe how to enable it? It seems to be located in
> gst-plugins-bad. I have seen in configure.ac the following lines:

It looks like I totally forgot to add windows support in the autotools build.
Currently you can build it on windows with meson only, if you can use that. I
opened this bug for adding autotools build on windows:
https://bugzilla.gnome.org/show_bug.cgi?id=782230

> dnl check for intel mediasdk
> translit(dnm, m, l) AM_CONDITIONAL(USE_MSDK, true)
> AG_GST_CHECK_FEATURE(MSDK, [Intel MediaSDK], msdk, [
>   AC_ARG_WITH([msdk-prefix],
>           AS_HELP_STRING([--with-msdk-prefix],
>           [Use the provided prefix for detecting the Intel MediaSDK]),
>           [AS_IF([test "x$with_msdk_prefix" != "x"],
>                  [MSDK_PREFIX="$with_msdk_prefix"])],
>           [AS_IF([test "x$MFX_HOME" != "x"],
>                  [MSDK_PREFIX="$MFX_HOME"],
>                  [MSDK_PREFIX="/opt/intel/media"])])
>   MSDK_CFLAGS="-I$MSDK_PREFIX/include"
>   MSDK_LIBS="-L$MSDK_PREFIX/lib/lin_x64 -lmfx -ldl"
>   AC_SUBST(MSDK_CFLAGS)
>   AC_SUBST(MSDK_LIBS)
> 
>   save_CPPFLAGS="$CPPFLAGS"
>   CPPFLAGS="$MSDK_CFLAGS $save_CPPFLAGS"
>   AC_CHECK_HEADER(mfxdefs.h, HAVE_MFXDEFS_H="yes", HAVE_MFXDEFS_H="no")
>   CPPFLAGS="$save_CPPFLAGS"
> 
>   save_LIBS="$LIBS"
>   LIBS="$MSDK_LIBS $LIBS"
>   AC_LANG_PUSH([C++])
>   AC_CHECK_LIB(mfx,MFXInit,HAVE_MFX_LIB="yes",HAVE_MFX_LIB="no")
>   AC_LANG_POP([C++])
>   LIBS="$save_LIBS"
> 
>   PKG_CHECK_MODULES(LIBVA_DRM, libva-drm, HAVE_LIBVA_DRM="yes",
> HAVE_LIBVA_DRM="no")
> 
>   if test "x$HAVE_MFXDEFS_H" = "xyes" \
>       -a "x$HAVE_MFX_LIB" = "xyes" \
>       -a "x$HAVE_LIBVA_DRM" = "xyes"; then
>     HAVE_MSDK="yes"
>   else
>     HAVE_MSDK="no"
>   fi
> ])
> AM_CONDITIONAL(USE_MSDK_LIBVA,
>     test "x$HAVE_MSDK" = "xyes" -a "x$HAVE_LIBVA_DRM" = "xyes")
> 
> 
> So it seems I had to add --with-msdk-prefix and let it point to Intel Media
> SDK,
> 
> which must be downloaded from Intel. I assume the Windows Version?
> 
> Where is the correct place to add --with-msdk-prefix? In the recipe of the
> gst-plugins-bad?
> 
> There is the following line:
> 
>   MSDK_LIBS="-L$MSDK_PREFIX/lib/lin_x64 -lmfx -ldl"
> 
> It looks like it is Linux dependant due to "lin" in "lin_x64". Are there
> always the Linux libraries used?
> 
> Shall/is "dl" available also on Windows?
> 
> It would be good to have a step-by-step instruction how to enable it. Can
> perhaps someone who has already built it shed light on how to do it?

The steps should be as simple as (1) Follow the Media Server Studio install
instructions, (2) build GStreamer. If that procedure isn't working then it's a
bug.

> Many, many thanks!
> 
> Best regards,
> 
> Martin
> 
> 
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