问题
On Android, you can record audio from the microphone using the MediaRecorder class: MediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
I want to record some parts of audio being played by a MediaPlayer instance instead (or some other audio playback device). Is that possible? How would I set a custom audio source?
To summarize; how do I stream audio into the MediaRecorder from an arbitrary audio source?
回答1:
I don't think there is an API for that for now. Though it IS possible, you would have to have access to the device's buffer, down to the kernel/hardware level. Even if you find a way, I don't think Android would give you permission to do this on application level.
来源：https://stackoverflow.com/questions/5849834/record-audio-on-android-with-mediaplayer-as-source