1.pulseaudio/src/pulse/simple.c
pa_simple* pa_simple_new(
        const char *server,
        const char *name,
        pa_stream_direction_t dir,
        const char *dev,
        const char *stream_name,
        const pa_sample_spec *ss,
        const pa_channel_map *map,
        const pa_buffer_attr *attr,
        int *rerror) {
        
  //流程一：创建共享内存   
  p->context = pa_context_new(pa_threaded_mainloop_get_api(p->mainloop), name);        
  
  //流程二：创建socket
  pa_context_connect(p->context, server, 0, NULL);
  
  //流程三：线程创建
  pa_threaded_mainloop_start(p->mainloop)；
  
  //流程四：填充play Or record参数及注册回调函数
  p->stream = pa_stream_new(p->context, stream_name, ss, map);
  
  //流程五
  pa_stream_connect_playback(p->stream, dev, attr,
                                       PA_STREAM_INTERPOLATE_TIMING
                                       |PA_STREAM_ADJUST_LATENCY