IndiaAIFounders — Educational PoC: Capturing raw PCM via AudioFlinger native hooking

Educational PoC: Capturing raw PCM via AudioFlinger native hooking

August 24, 2026 at 11:41 AM

Exploring the lowest levels of AOSP audio routing beyond high-level APIs like Oboe, this educational PoC uses NDK/JNI to inject a shared library into the audioserver process.

By inline-hooking AudioFlinger's RecordThread and PlaybackThread internally, it intercepts raw PCM buffers before they hit the HAL. It filters for AUDIO_MODE_IN_COMMUNICATION and specific UIDs (WhatsApp/Signal). Included is a controller app to manage SELinux and convert PCM to WAV (Requires root/emulator).

Source: https://github.com/nighthawkk/AudioServer-Voip-Recorder

submitted by /u/Dull-Plankton3027
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