Speex 音頻編解碼

// 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 160int 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;/*儲存編碼的狀態*/void *stateEncode;void *stateDecode;/*儲存位元組因此他們可以被speex常規讀寫*/SpeexBits bitsEncode;SpeexBits bitsDecode;int i, tmp;//建立一個新的編碼狀態在窄寬(narrowband)模式下stateEncode = speex_encoder_init(&speex_nb_mode);stateDecode = speex_decoder_init(&speex_nb_mode);//設定品質為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");//初始化結構使他們儲存資料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); //設定雜訊的dBint agc = 1;q=24000;//actually default is 8000(0,32768),here make it louder for voice is not loudy enough by default. 8000speex_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); //靜音檢測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));//讀入一幀16bits的聲音j++;int r=fread(in, sizeof(short), FRAME_SIZE, fin);if (r<FRAME_SIZE)break;//把16bits的值轉化為float,以便speex庫可以在上面工作spx_int16_t * ptr=(spx_int16_t *)in;if (speex_preprocess_run(m_st, ptr))//預先處理 開啟了靜音檢測和降噪{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];//清空這個結構體裡所有的位元組,以便我們可以編碼一個新的幀speex_bits_reset(&bitsEncode);//對幀進行編碼ret=speex_encode(stateEncode, input, &bitsEncode);//把bits拷貝到一個利用寫出的char型數組nbBytes = speex_bits_write(&bitsEncode, cbits, 200);fwrite(cbits, sizeof(char), nbBytes, fout1);printf("%02d,",nbBytes);//清空這個結構體裡所有的位元組,以便我們可以編碼一個新的幀speex_bits_reset(&bitsDecode);//將編碼資料如讀入bitsspeex_bits_read_from(&bitsDecode, cbits, nbBytes);//對幀進行解碼ret = speex_decode(stateDecode, &bitsDecode,output);for (i=0;i<FRAME_SIZE;i++)out[i]=output[i];fwrite(out, sizeof(short), FRAME_SIZE, fout2);}//釋放編碼器狀態量speex_encoder_destroy(stateEncode);//釋放bit_packing結構speex_bits_destroy(&bitsEncode);speex_decoder_destroy(stateDecode);//釋放bit_packing結構speex_bits_destroy(&bitsDecode);fclose(fin);fclose(fout1);fclose(fout2);fclose(fout3); return 0;}

轉帖：http://blog.csdn.net/zblue78/article/details/5841357