Speex Audio Codec Example _ sound and video coding and decoding

Address: http://wmnmtm.blog.163.com/blog/static/38245714201110801617165/

Ubuntu under the compiler Gcc-o Speexdec Speexdec.c-lspeex-logg

[csharp]  View Plain  copy// 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;                                      void *stateEncode;          void *stateDecode;                                                       speexbits  bitsEncode;         SpeexBits bitsDecode;             int i, tmp;                   //Create a new encoding state in narrow-width (narrowband) mode                    stateencode = speex_ Encoder_init (&speex_nb_mode);         statedecode = speex _decoder_init (&speex_nb_mode);         //Set quality to 8 (15kbps)                    tmp=0;      &NBSP;&NBSP;   speex_encoder_ctl (stateencode, speex_set_vbr, &tmp);          float q=4;         speex_encoder_ctl (Stateencode ,  speex_set_vbr_quality, &q);         speex_encoder_ctl ( STATEENCODE,&NBSP;SPEEX_SET_QUALITY,&NBSP;&AMP;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");      &NBSP;&NBSP;&NBSP;&NBSP;//initialization structure enables them to save data               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);  //Noise reduction          speex_preprocess_ctl (m_st,  speex_preprocess_set_noise_suppress, &noisesuppress);  //Set Noise 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,&NBSP;SPEEX_PREPROCESS_SET_AGC,&NBSP;&AMP;AGC);//Gain           speex_preprocess_ctl (M_ST,&NBSP;SPEEX_PREPROCESS_SET_AGC_LEVEL,&AMP;Q);          int vad = 1;          int vadprobstart = 80;         int vadprobcontinue =  65;         speex_preprocess_ctl (m_st, speex_preprocess_set_ VAD,&NBSP;&AMP;VAD);  //Mute detection          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));             //read a frame 16bits sound              j++;              int r=fread (in, sizeof (short),  frame_size, fin);                            if  (r<frame_size)                   break;                           //Converts the value of 16bits to float, So the Speex library can work on the above          spx_int16_t * ptr= (spx_int16_t * ) IN;&NBSP;&NBsp;                if  (speex_ Preprocess_run (M_ST,&NBSP;PTR)/preprocessing   turned on mute detection and noise reduction          {              printf ("speech,");             fwrite (in, sizeof (short), &NBSP;FRAME_SIZE,&NBSP;FOUT3);          }         else          {              printf ("Slience,");             fwrite (out,  sizeof (short), &NBSP;FRAME_SIZE,&NBSP;FOUT3);         }              for  (i=0;i<frame_size;i++)       &NBSP;&NBsp;                            input[i]=in[i];                           // Empty all the bytes in this structure so that we can encode a new frame                            speex_bits_reset (&bitsencode);                            //Frame Coding                            ret=speex_encode (stateencode,  Input, &bitsencode);             // Copy bits to a write-out char array              nbbytes = speex_bits_write (& bitsencode, cbits, 200);              Fwrite (Cbits, sizeof (char), &NBSP;NBBYTES,&NBSP;FOUT1);              printf ("D,", Nbbytes);                                // Empty all the bytes in this structure so that we can encode a new frame              speex_bits_ Reset (&bitsdecode);             //reads encoded data into bits              speex_bits_read_from (&bitsdecode,  cbits, nbbytes);                //to decode a frame              ret = speex_decode (stateDecode,  &bitsdecode,output);             for  (i=0; i<frame_size;i++)                   out[i]=output[i];             fwrite (out,  sizeof (short),  frame_size, fout2);         }                   //Release encoder State amount                    speex_encoder_ Destroy (Stateencode);                   //release bit_packing structure                    speex_bIts_destroy (&bitsencode);         speex_decoder_destroy (StateDecode );                  //release Bit_ Packing structure                   speex _bits_destroy (&bitsdecode);         fclose (Fin);          fclose (FOUT1);         fclose (FOUT2);          fclose (FOUT3);      return 0;              }