windows: Move IMMDevice work to common file, implement DirectSound enumeration support

src/core/windows/SDL_immdevice.h

@@ -0,0 +1,43 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_IMMDEVICE_H
+#define SDL_IMMDEVICE_H
+
+#include "SDL_atomic.h"
+#include "SDL_audio.h"
+
+#define COBJMACROS
+#include <mmdeviceapi.h>
+#include <mmreg.h>
+
+int SDL_IMMDevice_Init(void);
+void SDL_IMMDevice_Quit(void);
+int SDL_IMMDevice_Get(LPCWSTR devid, IMMDevice **device, SDL_bool iscapture);
+void SDL_IMMDevice_EnumerateEndpoints(SDL_bool useguid);
+
+SDL_AudioFormat WaveFormatToSDLFormat(WAVEFORMATEX *waveformat);
+
+/* these increment as default devices change. Opened default devices pick up changes in their threads. */
+extern SDL_atomic_t SDL_IMMDevice_DefaultPlaybackGeneration;
+extern SDL_atomic_t SDL_IMMDevice_DefaultCaptureGeneration;
+
+#endif /* SDL_IMMDEVICE_H */