Capture System Audio

[Forseth11]

I am making a screen recorder in Java and according to people on stack overflow Java is not good with audio capture and can not capture system audio output, so I want to make a JNI using a DLL in c++ to capture the system's audio. I searched Google and other things about how to do this, but I could not find anything.

In c++ how do I capture the audio being outputted by the system?

[xHyperionx]

That sounds like a really cool project. Will it also record the screen? If you end up getting it right can you hit me up with a pm of the source code? I have been looking for a screen recording to start you-tubing, but the good ones are a bit pricey xD

[Forseth11]

It already records the screen I just need to get the audio working. I will be giving it away for free but not the source code.
Anyways do you know how to do this audio thing I asked?

[xHyperionx]

That's cool, and unfortunately no. I only know how to have the program emit a specific set frequency, so that you could set it up to play a song, but other than that, unfortunately no. ;( and at what fps does it capture?

[modoran]

You can use WASAPI on windows:, you have a sample here:
http://blogs.msdn.com/b/matthew_van_eerde/archive/2014/11/05/draining-the-wasapi-capture-buffer-fully.aspx