[Bug 773720] New: directsoundsrc: incorrect cast of WinAPI function argument

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773720

            Bug ID: 773720
           Summary: directsoundsrc: incorrect cast of WinAPI function
                    argument
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: artem.martynovich at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 338830
  --> https://bugzilla.gnome.org/attachment.cgi?id=338830&action=edit
Cast first arg of mixerGetDevCaps to UINT_PTR

gst_directsound_src_mixer_find calls mixerGetDevCaps casting first parameter to
uint by using GPOINTER_TO_UINT. But the first parameter of mixerGetDevCaps is
actually UINT_PTR (see MSDN), which is 8 bytes long on 64-bit platform.
Such invalid usage causes read access violation inside of winmm.dll.

Attached a patch which casts the first argument to UINT_PTR.

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