Getting real / physical / hardware samplig rate of sound card

Question

I need to get real / physical / hardware (don't know the word) samplig rate of my soundcard. I'm generating High frequency square sound wave and playing it using DirectSound.
I need to match DirectSound sampling rate with the sound-card. I don't want windows mixer to re sample my sound because output wave will be totally unusable.
In short: How to get sound-card native sample rate?

Answer 1

You could use waveOutGetDevCaps (or waveInGetDevCaps if you want to sample signals ofer i.e. microphone). This functions will show you the supported sampling rates of your sound card.

http://msdn.microsoft.com/en-us/library/windows/desktop/dd743841%28v=vs.85%29.aspx

http://msdn.microsoft.com/en-us/library/windows/desktop/dd743857%28v=vs.85%29.aspx

Answer 2

You could use waveOutGetDevCaps (or waveInGetDevCaps if you want to sample signals ofer i.e. microphone). This functions will show you the supported sampling rates of your sound card.

http://msdn.microsoft.com/en-us/library/windows/desktop/dd743841%28v=vs.85%29.aspx

http://msdn.microsoft.com/en-us/library/windows/desktop/dd743857%28v=vs.85%29.aspx

This is nice.

But there is problem.
My sound card supports 44.1k/48k/96k/192kHz but those functions return me all flags. 11025, 22050 also.

Second thing. I can't find flag for 192kHz.

Is there other way?

Answer 3

Hi H180,

According to the description, I’d like to move this thread to "Windows Hardware WDK and Driver Development" forum for better support.

Thanks for your understanding.

Best regards,

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Helen Zhao [MSFT]
MSDN Community Support | Feedback to us

Answer 4

Helen, please move it back. this has nothing to do with writing a driver, rather user mode APIs on top of sound cards

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