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I am trying to build what I think is a basic app. Well, two apps one for windows and one for OS X. I would like to capture the audio signal that is playing (ie if the user is playing music out his/her speakers). Then take that signal and stream it out so another computer can "listen". The other computer would be Windows or OS X.
Thanks!
Chris
819
An audio output, or also known as audio out, drives a signal (digital or analog) into another device's audio input. They are found on audio-generating devices such as your TV or computers.
Check your audio input and output settings and be sure to specify which audio devices to use for each. A common, easily solvable, issue is to check if an audio device or source is muted, and to raise the output or recording volume. If it's a software issue, begin by updating your streaming app.
Check if the TV volume is set extremely low or muted. Check if the sound is working from other non-app sources such as TV channels, etc. Note: If there's no sound from other sources besides the apps, refer to the no sound section of the BRAVIA TV troubleshooting guide instead.
On Windows XP this isn't trivial at all because there's no way of intercepting the output signal without writing an audio filter driver (which is not somethign for the faint of heart).
On Windows Vista and above, you can capture the output of the audio engine by using the WASAPI APIs (built into Windows so they're free) and initializing an audio client with the AUDCLNT_STREAMFLAGS_LOOPBACK flag. This will give you a capture stream that's hooked to the output of the audio engine.
You can then package up that audio and send it to the other machine and render it with whatever audio rendering API you want.
I don't know how to do the equivilant on OSX though :(.
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