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MCI -redirecting sound from one device to another

Posted on 1997-10-28
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Last Modified: 2013-11-20
Can anyone tell me how to redirect the output of the microphone, from one device to another?

Details:
I can record a 'wav' file and then immediately play that down the phone, using mciSendCommand(..,MCI_RECORD,...) and MCI_PLAY. How ever this creates a time delay, I would like to send the output of the microphone directly to this device, has anyone any idea how to do this?

Thanks in advance
Yakky
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Question by:yakky
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anichini earned 100 total points
ID: 1308953
Here's a suggestion: look at the DirectShow SDK (it's available on the Microsoft web site at http://www.microsoft.com/directx/pavilion/dshow/default.asp

It is an object-oriented streams architecture that superscedes MCI. What you'll need to do is write a DirectShow filter that sends packets of audio data to your phone device. This will probably be done at a lower level than using mciSendCommand. Then hook the output of the Audio Capture DirectShow filter into the input of your custom filter. This should forward the data on with minimal delay (~10-50 ms, perhaps).

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by:yakky
ID: 1308954
Thanks for the suggestion. I had my suspisions that I would need to do some lower level programing. I was hoping there would be an easy way of doing it. Still I hadnt thought of using direct X.
Many Thanks
Yakky
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