$ show cyz7758520/Android_audio_talkback_demo_program
This is an Android demo application for real-time audio/video talkback (intercom) communication. It implements a full pipeline: audio/video capture, echo cancellation (multiple AEC algorithms: Speex, WebRTC AEC/AECM/AEC3, custom triple AEC), noise suppression (Speex, WebRTC NS/NSX, RNNoise), encoding (Speex, Opus, OpenH264, system H.264), network transport (TCP, UDP, AUDP), jitter buffering (adaptive), decoding, and playback. The architecture consists of a foreground service, a main activity with extensive settings UI, and background media processing threads (MediaPocsThrd, ClntMediaPocsThrd, SrvrThrd) that use user-defined callbacks for extensibility. The app is heavily configurable with presets for effect levels and AEC tendencies. It relies on pre-compiled native libraries (JNI) for signal processing and codecs. The codebase is tightly coupled to the demo app and uses deprecated Android Camera API, but demonstrates non-obvious skill in integrating multiple audio processing libraries and adaptive jitter buffer algorithms.
The LLM identified 3 files worth highlighting for reuse:
A thread-safe message queue for inter-thread communication with blocking and non-blocking modes. It is self-contained, uses a linked list of messages, and supports timeout-based retrieval. This pattern is reusable in any multi-threaded Android or Java application for decoupled message passing.
An adaptive jitter buffer for audio frames that dynamically adjusts buffer size based on network jitter. It handles packet loss, duplicate frames, and out-of-order delivery. The algorithm is non-trivial and can be extracted for use in any real-time audio streaming application.
A reusable TCP server socket wrapper that encapsulates connection management, buffer handling, and lock/unlock operations. It provides a clean interface for accepting connections and sending/receiving data, and can be extracted for any Java TCP server component.