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;

}

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zblue78/archive/2010/08/26/5841357.aspx