webrtc（二） ns

                     

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commit 99f8566524b3764bf84b7f4cbd8232bdf6c142a5Author: kjellander <kjellander@webrtc.org>Date:   Sun Nov 29 20:50:44 2015 -0800
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由于缺少说明文档和参考文献，这里简单罗列一下使用的例子

int nsTest(char *filename, char *outfilename, int mode){    //alloc    FILE *infp=fopen(filename,"r");    int nBands = 1;    int frameSize = 160;//10ms对应于160个short    short *temp = (short*)malloc(frameSize*sizeof(short));    float **pData = (float**)malloc(nBands*sizeof(float*));    pData[0] = (float*)malloc(frameSize*sizeof(float));    float **pOutData = (float**)malloc(nBands*sizeof(float*));    pOutData[0] = (float*)malloc(frameSize*sizeof(float));    int offset = 0;    //init    NsHandle *handle = 0;    int ret = 0;    handle=WebRtcNs_Create();    ret= WebRtcNs_Init(handle,16000);    if(ret==-1){        printf("%s","init failure!");        return -1;    }    ret = WebRtcNs_set_policy(handle,2);    //process    FILE *outfp = fopen(outfilename,"w");    int len = frameSize;    while(len > 0)    {        memset(temp, 0, frameSize*sizeof(short));        len = fread(temp, sizeof(short), frameSize, infp);        int i;        for(i = 0; i < frameSize; i++)        {            pData[0][i] = (float)temp[i];            //fprintf(stdout, "ns:%d\n", temp[i]);        }        WebRtcNs_AnalyzeCore((NoiseSuppressionC*)handle,pData[0]);        WebRtcNs_Process(handle,pData,nBands,pOutData);        for(i = 0; i < frameSize; i++)        {            temp[i] = (short)pOutData[0][i];            //fprintf(stderr, "ns:%d\n", temp[i]);        }        //write file        len = fwrite(temp,sizeof(short),len,outfp);    }    fclose(infp);    fclose(outfp);    WebRtcNs_Free(handle);    free(temp);    free(pData[0]);    free(pData);    free(pOutData[0]);    free(pOutData);}
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代码使用流程参考webrtc/modules/audio_processing/noise_suppression_impl.cc