DirectX Audio playback is broken with some multichannel files

This file has many lossy audio streams for testing http://streams.videolan.org/misc/test-files-ccc/%5bCCCP%5d_Mega_Audio_Test.mkv

On the master or the vlc-3.0.0-git-20150309-0002 build, when forcing the DirectX audio output aout the default track (AC3 5.1) stutters. When selecting Automatic this default track works (mmdevice aout is used), but when selecting the DTS 768 2ch track it stutters (mmdevice fails to initialize so directsound is used).

With the 2.2.0 release, forcing DirectX audio output or using Automatic aout the AC3 5.1 and DTS 2ch tracks play fine. When forcing mmdevice the AC3 5.1 track plays fine, it stutters when switching to DTS 2ch.

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