一套不错的音视频SDK，可用于二次开发，无回声问题，支持1080P高清视频通讯，采用了P2P技术，支持多平台互通，公开了代码跟开发文档，很适合做项目。-A good set of audio and video SDK for secondary development, no echo problems, support 1080P HD video communications using P2P technology to support multi-platform interopera

amr wb 编码 VisualOn AMR-WB encoder library This library contains an encoder implementation of the Adaptive Multi Rate Wideband (AMR-WB) audio codec. The library is based on a codec implementation by VisualOn as part of the Stagefright frame

android 音乐播放器 ，具备简单的功能，播放，暂停，停止，下一曲等。功能多，代码简单。-android music player, with a simple function, play, pause, stop, next one and so on. Multi-functional, simple code.

Channelized receiver based on multi-phase structure, DC-DC power single-part set-loop control, Is the topic of the elementary school stage curriculum design.