Application of Zero-Copy In Real-time PCM Capture
Weimin Lei · Microcomputer Information · 2009
audio data using various codec is converted into PCM format before written into sound card. Especially in some cases,audio data is deciphered by applications until written into sound card. Thus,capturing PCM stream is the only method to obtain audio data. Given audio data is often delay-sensitive,in this paper,an efficient mechanism based on Linux is proposed,which applies zero-copy technique generally used in web cache,to enhance the capture efficiency.