Mediostream框架filter使用说明

##1.链接说明

   ms_filter_link(stream->soundread,0,stream->ec,0);
ms_filter_link(stream->ec,0,stream->encoder,0);    
//inputs[0] 将数据链接到0
ms_filter_link(stream->decoder,0,stream->ec,1);
ms_filter_link(stream->ec,1,stream->soundwrite,0);
//inputs[1]将数据链接到1

##2.数据读取

while((tmp=ms_queue_get(f->inputs[1]))!=NULL){
    //拿回inputs[1]数据  是从soundread来的
    log_error("save_voice tmp.pcm");
    inputlen=msgdsize(tmp);
    memcpy(tmpinput,tmp->b_rptr,inputlen);
    save_voice(voicetmp,tmpinput,inputlen);
   //save_voice(voicetmp,tmp->b_rptr,msgdsize(tmp));
    ile++;
    ce=allocb(inputlen,0);

    memcpy(ce->b_rptr, tmp->b_rptr, inputlen);

    ce->b_wptr+=inputlen;
    ms_queue_put(f->outputs[1],ce);

    freemsg(tmp);
}

while((im=ms_queue_get(f->inputs[0]))!=NULL){
    int len=msgdsize(im);
//拿回inputs[0]数据   是从decoder来的

##3.接口说明

MSFilterDesc ms_webrtc_aec_desc={
    MS_WEBRTC_AEC_ID,
    "MSWebRTCAEC",
    "Echo canceller using WebRTC library.",
    MS_FILTER_OTHER,
    "AEC",
    2,  //两进两出  ipnuts[0]和inputs[1]
    2,
    webrtc_aec_init,
    webrtc_aec_preprocess,
    webrtc_aec_process,
    webrtc_aec_postprocess,
    webrtc_aec_uninit,
    webrtc_aec_methods,
    0
};