Speex 音频编解码
// 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; }