[wdmaudiodev] Re: wasapi audioclientproperties
- From: gordon keith <gordik55@xxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 12 Jun 2014 07:24:54 +0000
thanks
From: Matthew.van.Eerde@xxxxxxxxxxxxx
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: wasapi audioclientproperties
Date: Wed, 11 Jun 2014 22:46:23 +0000
OK, so you’re using a USB audio device.
FWIW, on Windows 7 I would expect IMMDevice::Activate(IAudioClient2) to fail;
IAudioClient2 is a Windows 8.0-and-later thing.
Even on Windows 8.0, I would expect IAudioClient2::SetClientProperties(…) to
fail if you give it an AudioClientProperties object that has .cbSize = 16; in
Windows
8.0, sizeof(AudioClientProperties) was 12, not 16, since there was no .Options
member. Raw mode is purely a Windows 8.1-and-later thing.
// audioclient.h
#if (NTDDI_VERSION < NTDDI_WINBLUE)
typedef struct AudioClientProperties
{
UINT32 cbSize;
BOOL bIsOffload;
AUDIO_STREAM_CATEGORY eCategory;
} AudioClientProperties;
#else
typedef struct AudioClientProperties
{
UINT32 cbSize;
BOOL bIsOffload;
AUDIO_STREAM_CATEGORY eCategory;
AUDCLNT_STREAMOPTIONS Options;
} AudioClientProperties;
#endif
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