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Some months ago, with Android ICS (4.0), I developed an android kernel module which intercepted the "pcmC0D0p"-module to fetch all system audio. My target is to stream ALL audio (or at least the played music) to a remote speaker via AirPlay. The kernel module worked, but there where several problems (kernel-versions, root-privileges etc.) so I stopped working on this. Now, we have Android 4.1 and 4.2 and I have new hope! Who has an idea how to capture the audio in Android? I had following ideas: Connect via bluetooth to the same phone, set routing to BT and grab the audio on the "other end": this shouldn't work Intercept the audio with a kernel module like done before: hardcore, get it worked but not applicable JACK Audio Connection Kit : sadly Android uses "tinyALSA" and not "ALSA". TinyALSA does NOT support any filters like JACK (but this brought the idea with the kernel module) Use PulseAudio as a replacement for AudioFlinger, but this is also not applicable EDIT (forgot them): I compiled "tinymix" (baby-version of ALSA-mixer) from tinyALSA (the ALSA on Android) and tried to route the audio-out to mic-in - but with no success ( not understandable for me ). And this also needs rooting: not applicable I tested OpenSL ES , but I'm not a C-crack and it ended in "I can record microphone, but no more" (maybe I was wrong?) <

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