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;   
       
}