Speex音频编解码

#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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