How do u extract audio from computer to a file

rouncer 103 Aug 26, 2009 at 15:05

say i want to get the speaker audio stream and record it to wave, how do i do this.

I want to make a screen recorder with sound activated, I guess getting the windows screen into a bmp file is a windows command, is this possible this way also?

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alphadog 101 Aug 26, 2009 at 16:47

I am going to assume on Windows only?

Well, there are two orthogonal issues: one is Vista vs. earlier OSes, and the other is DRM vs. non-DRM audio.

For example, on Vista or higher, look into WASAPI (Windows Audio Session API) in CoreAudio. YOu can easily jack in and do some loopback recording. However, it won’t work with DRMed audio.

On earlier versions of Windows, or with DRMed audio, you have to get much more exotic. You basically have to build a driver (a filter driver, I think). Not a quickie type task, that’s certain.