HsAudio C Source Library is an audio software library implemented in C language. HsAudio offers user applications a convenient API interface to the audio and sound functionality on Microsoft Windows, Apple MAC OS X and iPhone iOS. HsAudio can be used in implementing audio / sound streaming and voice communication / telephony applications. HsAudio offers the following main features to user applications: * Detection of installed audio devices * Recording audio from system audio input devices * Playback of audio to system audio output devices * Single and dual frequency tone buffer synthethis / generation in software * Operations on WAVE files * Supported audio formats: Linear PCM, GSM 6.10, G.711 a-law and u-law * Built-in jitter buffer