speex降噪算法移植及测试

下载 libspeexdsp
PC上，编译。修改内置demo
输入in.pcm ,输出out.pcm, 用音频分析软件及实测效果OK.

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "speex/speex_preprocess.h"
#include <stdio.h>

#define NN 160

int main()
{
   short in[NN];
   int i;
   SpeexPreprocessState *st;
   int count=0;
   float f;
   unsigned long flen=0;
   
   FILE *infile = fopen("in.pcm", "rb");
   FILE *outfile = fopen("out.pcm", "wb");

   fseek(infile,0L,SEEK_END);
   flen = ftell(infile);
   printf("file size=%ld\n",flen);
   fseek(infile,0L,SEEK_SET);

   st = speex_preprocess_state_init(NN, 8000);
   i=1;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_DENOISE, &i);
   i=0;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_AGC, &i);
   i=8000;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_AGC_LEVEL, &i);
   i=0;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_DEREVERB, &i);
   f=.0;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_DEREVERB_DECAY, &f);
   f=.0;
   speex_preprocess_ctl(st, SPEEX_PREPROCESS_SET_DEREVERB_LEVEL, &f);
   
   while (1)
   {
      int vad;
      fread(in, sizeof(short), NN, infile);
      if (feof(infile))
         break;
      vad = speex_preprocess_run(st, in);
      /*fprintf (stderr, "%d\n", vad);*/
      fwrite(in, sizeof(short), NN, outfile);
      count++;
   }
   printf("count=%d\n",count);
   speex_preprocess_state_destroy(st);
   fclose(infile);
   fclose(outfile);
   return 0;
}