Casting to UINT from HMIXER generates the following warning with 64bit Windows target MinGW: gstdirectsoundsrc.c: In function 'gst_directsound_src_mixer_find': gstdirectsoundsrc.c:733:30: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast] mmres = mixerGetDevCaps ((UINT) dsoundsrc->mixer, ^ cc1: all warnings being treated as errors We can use portable GPOINTER_TO_UINT() macro for this propose. https://bugzilla.gnome.org/show_bug.cgi?id=754756