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* windows_utils: try and use FormatMessage for errors.Kevin Mitchell2016-02-171-1/+1
| | | | | | This is useful in particular for GetLastError, unfortunately, it's stil pretty dumb with regards to WASAPI or D3D specific errors, so keep the hresult_to_string switch.
* ao_wasapi: move out some utility functionswm42016-01-111-0/+29
Note that hresult_to_str() (coming from wasapi_explain_err()) is mostly wasapi-specific, but since HRESULT error codes are unique, it can be extended for any other use.