问题
Is there a way to capture the audio outputted by only a single application, and not the system as a whole? With WASAPI I can capture the entire system audio, but I wish to only capture the audio from one application (there will be many applications, all playing audio at once.)
回答1:
Detours is used for hooking. Using the lib to hook IAudioRenderClient interface, including GetBuffer and ReleaseBuffer, and read data from the buffer.
回答2:
Depending on the APIs used by the application to play the audio, you could write an AppInit DLL that will wrap the built-in waveIn\waveOut functions and would pass along the audio data. I know this works with the waveIn\waveOut functions, but not sure what other audio playback interfaces there are on Windows 7 and whether they are compatible with the AppInit trick.
来源：https://stackoverflow.com/questions/6084550/capture-audio-of-a-single-application-on-windows-7