Speex 音频编解码 示例

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地址：http://wmnmtm.blog.163.com/blog/static/38245714201110801617165/

Ubuntu下编译gcc -o speexdec speexdec.c -lspeex -logg

// demo.cpp : Defines the entry point for the console application.  
//  
#include "stdafx.h"  
#include <speex/speex.h>  
#include <stdio.h>   
#include <ostream>  #include <speex/speex_preprocess.h>  
#include <speex/speex_echo.h>   
#pragma comment(lib,"libspeexdsp.lib")   
#define FRAME_SIZE 160  
int main(int argc, char **argv)  
{  char *inFile;  FILE *fin,*fout1,*fout2,*fout3;  short in[FRAME_SIZE];  short out[FRAME_SIZE];    float input[FRAME_SIZE];  float output[FRAME_SIZE];     char cbits[200];  int nbBytes;  void *stateEncode;  void *stateDecode;  SpeexBits bitsEncode;  SpeexBits bitsDecode;     int i, tmp;  //新建一个新的编码状态在窄宽(narrowband)模式下  stateEncode = speex_encoder_init(&speex_nb_mode);  stateDecode = speex_decoder_init(&speex_nb_mode);  //设置质量为8(15kbps)  tmp=0;  speex_encoder_ctl(stateEncode, SPEEX_SET_VBR, &tmp);  float q=4;  speex_encoder_ctl(stateEncode, SPEEX_SET_VBR_QUALITY, &q);  speex_encoder_ctl(stateEncode, SPEEX_SET_QUALITY, &tmp);  inFile = argv[1];  fin = fopen("c:/demo.pcm", "rb");  fout1 = fopen("c:/demo_speex.raw", "wb");  fout2 = fopen("c:/demo1.pcm", "wb");  fout3 = fopen("c:/demo_slience.pcm", "wb");  //初始化结构使他们保存数据  speex_bits_init(&bitsEncode);  speex_bits_init(&bitsDecode);  int ret;  int j=0;  SpeexPreprocessState * m_st;  SpeexEchoState *echo_state;   m_st=speex_preprocess_state_init(160, 8000);  
//  echo_state = speex_echo_state_init(160, 8000);   int denoise = 1;  int noiseSuppress = -25;  speex_preprocess_ctl(m_st, SPEEX_PREPROCESS_SET_DENOISE, &denoise); //降噪  speex_preprocess_ctl(m_st, SPEEX_PREPROCESS_SET_NOISE_SUPPRESS, &noiseSuppress); //设置噪声的dB  int agc = 1;  q=24000;  //actually default is 8000(0,32768),here make it louder for voice is not loudy enough by default. 8000  speex_preprocess_ctl(m_st, SPEEX_PREPROCESS_SET_AGC, &agc);//增益  speex_preprocess_ctl(m_st, SPEEX_PREPROCESS_SET_AGC_LEVEL,&q);  int vad = 1;  int vadProbStart = 80;  int vadProbContinue = 65;  speex_preprocess_ctl(m_st, SPEEX_PREPROCESS_SET_VAD, &vad); //静音检测  speex_preprocess_ctl(m_st, SPEEX_PREPROCESS_SET_PROB_START , &vadProbStart); //Set probability required for the VAD to go from silence to voice   speex_preprocess_ctl(m_st, SPEEX_PREPROCESS_SET_PROB_CONTINUE, &vadProbContinue); //Set probability required for the VAD to stay in the voice state (integer percent)   while (1)  {  memset(out,0,FRAME_SIZE*sizeof(short));  //读入一帧16bits的声音  j++;  int r=fread(in, sizeof(short), FRAME_SIZE, fin);  if (r<FRAME_SIZE)  break;  //把16bits的值转化为float,以便speex库可以在上面工作  spx_int16_t * ptr=(spx_int16_t *)in;  if (speex_preprocess_run(m_st, ptr))//预处理 打开了静音检测和降噪  {  printf("speech,");  fwrite(in, sizeof(short), FRAME_SIZE, fout3);  }  else  {  printf("slience,");  fwrite(out, sizeof(short), FRAME_SIZE, fout3);  }  for (i=0;i<FRAME_SIZE;i++)  input[i]=in[i];  //清空这个结构体里所有的字节,以便我们可以编码一个新的帧  speex_bits_reset(&bitsEncode);  //对帧进行编码  ret=speex_encode(stateEncode, input, &bitsEncode);  //把bits拷贝到一个利用写出的char型数组  nbBytes = speex_bits_write(&bitsEncode, cbits, 200);  fwrite(cbits, sizeof(char), nbBytes, fout1);  printf("d,",nbBytes);  //清空这个结构体里所有的字节,以便我们可以编码一个新的帧  speex_bits_reset(&bitsDecode);  //将编码数据如读入bits  speex_bits_read_from(&bitsDecode, cbits, nbBytes);    //对帧进行解码  ret = speex_decode(stateDecode, &bitsDecode,output);  for (i=0;i<FRAME_SIZE;i++)  out[i]=output[i];  fwrite(out, sizeof(short), FRAME_SIZE, fout2);  }  //释放编码器状态量  speex_encoder_destroy(stateEncode);  //释放bit_packing结构  speex_bits_destroy(&bitsEncode);  speex_decoder_destroy(stateDecode);  //释放bit_packing结构  speex_bits_destroy(&bitsDecode);  fclose(fin);  fclose(fout1);  fclose(fout2);  fclose(fout3);  return 0;  }  

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