lbccodec.c

这是g.723语音标准的编码过程

/*
**
** File:        "lbccodec.c"
**
** Description:     Top-level source code for G.723 dual-rate codec
**
** Functions:       main
**                  Process_files()
**
**
*/


/*
    ITU-T G.723 Speech Coder   ANSI-C Source Code     Version 5.00
    copyright (c) 1995, AudioCodes, DSP Group, France Telecom,
    Universite de Sherbrooke.  All rights reserved.
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "typedef.h"
#include "basop.h"
#include "cst_lbc.h"
#include "tab_lbc.h"
#include "lbccodec.h"
#include "coder.h"
#include "exc_lbc.h"
#include "util_lbc.h"
#include "cod_cng.h"
#include "vad.h"
#include "tame.h"
#include "lsp.h"
#include "lpc.h"
#include "util_cng.h"

DECSTATDEF  DecStat  ;   //解码静态变量
CODCNGDEF CodCng;       //CNG （舒适噪声生产器）编码部分
CODSTATDEF  CodStat  ;    //编码静态变量
VADSTATDEF  VadStat ;    //Vad（活动语音）静态变量

/* Global variables */  
enum  Crate    WrkRate = Rate53 ;

int   PackedFrameSize = 20 ;

Flag    UseHp = True ;
Flag    UsePf = True ;   
Flag    UseVx = False ;  //判断编解码标志
Flag    UsePr = True ;   //应用输出（到标准设备）

char  SignOn[] = "ACL/USH/FT/DSPG ANSI C CODEC ITU LBC Ver 5.00\n" ;

int main(int argc, char *argv[])
{
    FILE    *Ifp, *Ofp ;            /* I/O File pointers */
  
    long    FrCnt = 0 ;
    long    FlLen ;

    Word16  DataBuff[Frame] ; //240字节的侦缓冲区

    char    Line[20] ;

    printf("%s", SignOn ) ;

    /* Process arguments and open I/O files */
    FlLen = Process_Files( &Ifp, &Ofp, argc, argv ) ;

    /*
      Init coder 
    */
    Init_Coder( ) ;

    /* Init Comfort Noise Functions */
    if( UseVx ) {
        Init_Vad();
        Init_Cod_Cng( );
    }

    /* Process all the input file */
    do {
        reset_max_time();
        Read_lbc( DataBuff, Frame, Ifp ) ;
        Coder( DataBuff, Line ) ;
        Line_Wr( Line, Ofp ) ;

        FrCnt ++ ;
        if( UsePr) {
           fprintf( stdout, "Done : %6ld %3ld\r", FrCnt, FrCnt*100/FlLen ) ;
           fflush(stdout); //标准输出设备
        }

    }   while ( FrCnt < FlLen ) ;

    if(Ifp) { (void)fclose(Ifp); }
    if(Ofp) { (void)fclose(Ofp); }
    return 0 ;
}


/*
   This function processes the argument parameters. The function
      opens the IO files, and sets the global arguments accordingly
      to the command line parameters.
*/
long  Process_Files( FILE **Ifp, FILE **Ofp, int Argc, char *Argv[] )
{
    int     i ;
    long    Flen ;

    /*
      Process the argument list, if any
    */
    if (Argc < 3 ) {
        printf("Usage: %s [options] inputfile outputfile \n", Argv[0]);
        exit(1);
    }

    for ( i = 1 ; i < Argc-2 ; i ++ ) {


        if ( ! strcmp("-v", Argv[i]) ) {
            UseVx = True ;
            continue ;
        }

        if ( ! strcmp("-Noh", Argv[i]) ) {
            UseHp = False;
            continue ;
        }

        if ( ! strcmp("-Nop", Argv[i]) ) {
            UsePf = False;
            continue ;
        }


        if ( ! strcmp("-n", Argv[i]) ) {
            UsePr = False;
            continue ;
        }

        fprintf(stderr, "Illegal argument, %s\n", Argv[i] ) ;
        exit(1) ;
    }

    *Ifp = fopen( Argv[Argc-2], "rb") ;
    if ( *Ifp == NULL ) {
        fprintf(stderr, "Invalid input file name: %s\n", Argv[Argc-2] ) ;
        exit(1) ;
    }

    if ( UsePr )
        printf("Input  file:     %s\n", Argv[Argc-2] ) ;

    *Ofp = fopen( Argv[Argc-1], "wb") ;
    if ( *Ofp == NULL ) {
        fprintf(stderr, "Can't open output file: %s\n", Argv[Argc-1] ) ;
        exit(1) ;
    }
    if ( UsePr )
        printf("Output file:     %s\n", Argv[Argc-1] ) ;

    /* Options report */
    if ( UsePr ) {

        printf("Options:\n");
         
        printf("Encoder\n");
     
        printf("Rate 5.3 kb/s\n");
         
        if (UseHp == 0 )
            printf("Highpassfilter disabled\n");
        else
            printf("Highpassfilter enabled\n");
        if (UseVx == 0 )
            printf("VAD/CNG disabled\n");
        else
            printf("VAD/CNG enabled\n");

    }

    /*
      Compute the file length
    */
    fseek( *Ifp, 0L, SEEK_END ) ;
    Flen = ftell( *Ifp ) ;
    rewind( *Ifp ) ;

    Flen /= sizeof(Word16)*Frame ;

    return Flen ;
}


#include "basop.c"
#include "tab_lbc.c"
#include "coder.c"
#include "exc_lbc.c"
#include "util_lbc.c"
#include "cod_cng.c"
#include "vad.c"
#include "tame.c"
#include "lsp.c"
#include "lpc.c"
#include "util_cng.c"