Speex 音频编解码

 // 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;

     /*保存编码的状态*/

     void *stateEncode;
     void *stateDecode;

     /*保存字节因此他们可以被speex常规读写*/



     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("%02d,",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;

 }