基于C的Speex 音频编解码

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// 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;  
      
} 

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