unit1.cpp

G722语音压缩算法

//---------------------------------------------------------------------------

#include <vcl.h>
#include <math.h>
#pragma hdrstop

#include "Unit1.h"


#define bufsize 160
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    int i;
    static k=0;
    short datain[bufsize],dataout[bufsize];
    UINT16 Adpcm[bufsize];
    static int FirstRun = 1;
    
    static  G722_Handle  Encode, Decode;
    if(FirstRun)
    {
       G722_EncodeInit( &Encode );
       G722_DecodeInit( &Decode ); 
       FirstRun = 0;
    }

     Series1->Clear();
     for( i=0; i<bufsize; i++,k++)
     {
         datain[i]=32767*sin(10*k*M_PI/bufsize);
         Series1->Add( datain[i], "", clTeeColor );
     }
    
    //for( j=0; j<N; j++)
    //{
      G722_Encode( &Encode, datain, Adpcm, bufsize );
      G722_Decode( &Decode, Adpcm, dataout, bufsize );

    Series2->Clear();
    for(i=0;i<bufsize ;i++)
    {
       Series2->Add( dataout[i-22], "", clTeeColor );
    }
}
//---------------------------------------------------------------------------