Audio capture and processing

Question

My task is capturing audio data from microphone and process uncompressed PCM data on fly. Can I do this using WinRT? (I also asuming that DirectSound is not available in Windows 8)

Thanks.

Answer 1

Hello,

Yes, You can MediaCapture class in WinRT to capture the audio.
http://msdn.microsoft.com/library/windows/apps/BR241124

Here a sample code about this class, and I hope you can follow it.
http://code.msdn.microsoft.com/windowsapps/Media-Capture-Sample-adf87622

Best regards,
Jesse

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Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 2

Hello Daemonolog,

Here are two additional options for you:

1) Use WASAPI to capture the raw audio data. This option will have the lowest latency (preferred)

2) Create a custom Media Sink that can plug into the Media Foundation Media Engine or Media Capture element.

Either approach will work as expected and give you complete access to the underlying uncompressed PCM audio data. Both of these methods require that you use C++ Cx (MoCOM). It is highly recommended that you not process raw audio or video data in a managed environment due to issues with nondeterministic finalization.

How do I create a lossless MediaEncodingProfile?
http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/e39ab371-ccaf-49f9-a5d8-49a24598dc5e

Win32 and COM for Metro style apps (multimedia)
http://msdn.microsoft.com/en-us/library/windows/apps/hh452756.aspx

Real-time communication sample
http://code.msdn.microsoft.com/windowsapps/Simple-Communication-Sample-eac73290

Calling the Format SDK, DirectShow, Media Foundation or the WASAPI from managed code (C#, VB.net)
http://blogs.msdn.com/b/mediasdkstuff/archive/2009/04/01/calling-the-format-sdk-directshow-media-foundation-or-the-wasapi-from-managed-code-c-vb-net.aspx

I hope this helps,

James

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Windows Media SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/