util2.c

symbian 系统下的g.723 g.723_24实现, 本源码在 series60 sdk fp2下调试通过

/*
**
** File:    util2.c
**
** Description: utility functions for the lbc codec
**
** Functions:
**
**  I/O functions:
**
**      Read_lbc()
**      Write_lbc()
**
**  High-pass filtering:
**
**      Rem_Dc()
**
**  Miscellaneous signal processing functions:
**
**      Vec_Norm()
**      Mem_Shift()
**      Scale()
**
**  Bit stream packing/unpacking:
**
**      Line_Pack()
**      Line_Unpk()
**
**  Mathematical functions:
**
**      Rand_lbc()
*/

/*
    ITU-T G.723.1 Floating Point Speech Coder ANSI C Source Code.  Version 5.1F

    Original fixed-point code copyright (c) 1995,
    AudioCodes, DSP Group, France Telecom, Universite de Sherbrooke.
    All rights reserved.

    Floating-point code copyright (c) 1995,
    Intel Corporation and France Telecom (CNET).
    All rights reserved.
*/

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <float.h>

#include "typedef2.h"
#include "cst2.h"
#include "lbccode2.h"
#include "coder2.h"
#include "decod2.h"
#include "util2.h"

/*
**
** Function:        Read_lbc()
**
** Description:     Read in a file
**
** Links to text:   Sections 2.2 & 4
**
** Arguments:
**
**  FLOAT  *Dpnt
**  int     Len
**  FILE *Fp
**
** Outputs:
**
**  FLOAT  *Dpnt
**
** Return value:    None
**
*/
void  Read_lbc (FLOAT *Dpnt, int Len, FILE *Fp)
{
    Word16 Ibuf[Frame];
    int    i,n;

    n = fread (Ibuf, sizeof(Word16), Len, Fp);
    for (i=0; i<n; i++)
        Dpnt[i] = (FLOAT) Ibuf[i];
    for (i=n; i<Len; i++)
        Dpnt[i] = (FLOAT)0.0;
}

/*
**
** Function:        Write_lbc()
**
** Description:     Write a file
**
** Links to text:   Section
**
** Arguments:
**
**  FLOAT  *Dpnt
**  int     Len
**  FILE *Fp
**
** Outputs:         None
**
** Return value:    None
**
*/
void  Write_lbc(FLOAT *Dpnt, int Len, FILE *Fp)
{
    Word16 Obuf[Frame];
    int    i;

    for (i=0; i<Len; i++)
    {
        if (Dpnt[i] < (FLOAT)-32767.5)
            Obuf[i] = -32768L;
        else if (Dpnt[i] > (FLOAT)32766.5)
            Obuf[i] = 32767;
        else
        {
            if (Dpnt[i] < 0)
                Obuf[i] = (Word16) (Dpnt[i]-(FLOAT)0.5);
            else
                Obuf[i] = (Word16) (Dpnt[i]+(FLOAT)0.5);
        }
    }
    fwrite(Obuf, sizeof(Word16), Len, Fp);
}

void    Line_Wr(char *Line, FILE *Fp)
{
    Word16    Info;
    int       Size;

    Info = (Word16) (Line[0] & 0x0003);

    /* Check frame type and rate information */
    switch (Info) {

        case 0x0002 : {  /* SID frame */
            Size = 4;
            break;
        }

        case 0x0003 : {  /* untransmitted silence frame */
            Size = 1;
            break;
        }

        case 0x0001 : {  /* active frame, low rate */
            Size = 20;
            break;
        }

        default : {      /* active frame, high rate */
            Size = 24;
        }
    }

    fwrite(Line, Size, 1, Fp);
}

int    Line_Rd(char *Line, FILE *Fp)
{
    Word16    Info;
    int       Size;

    if (fread(Line, 1,1, Fp) != 1)
        return (-1);

    Info = (Word16) (Line[0] & 0x0003);

    /* Check frame type and rate information */
    switch (Info) {

        /* Active frame, high rate */
        case 0 : {
            Size = 23;
            break;
        }

        /* Active frame, low rate */
        case 1 : {
            Size = 19;
            break;
        }

        /* Sid Frame */
        case 2 : {
            Size = 3;
            break;
        }

        /* untransmitted */
        default : {
            return 0;
        }
    }

    fread(&Line[1], Size, 1, Fp);
    return 0;
}

/*
**
** Function:        Rem_Dc()
**
** Description:     High-pass filtering
**
** Links to text:   Section 2.3
**
** Arguments:
**
**  FLOAT  *Dpnt
**
** Inputs:
**
**  CodStat.HpfZdl  FIR filter memory from previous frame (1 word)
**  CodStat.HpfPdl  IIR filter memory from previous frame (1 word)
**
** Outputs:
**
**  FLOAT  *Dpnt
**
** Return value:    None
**
*/

void  Rem_Dc(FLOAT *Dpnt)
{
    int   i;
    FLOAT acc0;

    if (UseHp)
    {
        for (i=0; i < Frame; i++)
        {
            acc0 = Dpnt[i] - CodStat.HpfZdl;
            CodStat.HpfZdl = Dpnt[i];

            Dpnt[i] = CodStat.HpfPdl =
                            acc0 + CodStat.HpfPdl*((FLOAT)127.0/(FLOAT)128.0);
        }
    }
}


/*
**
** Function:        Mem_Shift()
**
** Description:     Memory shift, update of the high-passed input speech signal
**
** Links to text:
**
** Arguments:
**
**  FLOAT *PrevDat
**  FLOAT *DataBuff
**
** Outputs:
**
**  FLOAT *PrevDat
**  FLOAT *DataBuff
**
** Return value:    None
**
*/

void  Mem_Shift(FLOAT *PrevDat, FLOAT *DataBuff)
{
    int  i;

    FLOAT Dpnt[Frame+LpcFrame-SubFrLen];

    /*  Form Buffer  */

    for (i=0; i < LpcFrame-SubFrLen; i++)
        Dpnt[i] = PrevDat[i];
    for (i=0; i < Frame; i++)
        Dpnt[i+LpcFrame-SubFrLen] = DataBuff[i];

    /*  Update PrevDat  */

    for (i=0; i < LpcFrame-SubFrLen; i++)
        PrevDat[i] = Dpnt[Frame+i];

    /*  Update DataBuff  */

    for (i=0; i < Frame; i++)
        DataBuff[i] = Dpnt[(LpcFrame-SubFrLen)/2+i];
}

/*
**
** Function:        Line_Pack()
**
** Description:     Packing coded parameters in bitstream of 16-bit words
**
** Links to text:   Section 4
**
** Arguments:
**
**  LINEDEF *Line     Coded parameters for a frame
**  char    *Vout     bitstream chars
**  Word16   Ftyp     Voice Activity Indicator
**
** Outputs:
**
**  Word16 *Vout
**
** Return value:    None
**
*/
void    Line_Pack(LINEDEF *Line, char *Vout, Word16 Ftyp)
{
    int       i;
    int       BitCount;

    Word16    BitStream[192];
    Word16    *Bsp = BitStream;
    Word32    Temp;

    /* Clear the output vector */
    for ( i = 0 ; i < 24 ; i ++ )
        Vout[i] = 0 ;

 /*
  * Add the coder rate info and frame type info to the 2 msb
  * of the first word of the frame.
  * The signaling is as follows:
  *     Ftyp  WrkRate => X1X0
  *       1     Rate63     00  :   High Rate
  *       1     Rate53     01  :   Low  Rate
  *       2       x        10  :   Silence Insertion Descriptor frame
  *       0       x        11  :   Used only for simulation of
  *                                 untransmitted silence frames
  */
    switch (Ftyp) {

        case 0 : {
            Temp = 0x00000003L;
            break;
        }

        case 2 : {
            Temp = 0x00000002L;
            break;
        }

        default : {
            if ( WrkRate == Rate63 )
                Temp = 0x00000000L;
            else
                Temp = 0x00000001L;
            break;
        }
    }

    /* Serialize Control info */
    Bsp = Par2Ser( Temp, Bsp, 2 ) ;

    /* Check for Speech/NonSpeech case */
    if ( Ftyp == 1 ) {

        /* 24 bit LspId */
        Temp = (*Line).LspId ;
        Bsp = Par2Ser( Temp, Bsp, 24 ) ;

        /*
         *  Do the part common to both rates
         */

        /* Adaptive code book lags */
        Temp = (Word32) (*Line).Olp[0] - (Word32) PitchMin ;
        Bsp = Par2Ser( Temp, Bsp, 7 ) ;

        Temp = (Word32) (*Line).Sfs[1].AcLg ;
        Bsp = Par2Ser( Temp, Bsp, 2 ) ;

        Temp = (Word32) (*Line).Olp[1] - (Word32) PitchMin ;
        Bsp = Par2Ser( Temp, Bsp, 7 ) ;

        Temp = (Word32) (*Line).Sfs[3].AcLg ;
        Bsp = Par2Ser( Temp, Bsp, 2 ) ;

        /* Write combined 12 bit index of all the gains */
        for ( i = 0 ; i < SubFrames ; i ++ ) {
            Temp = (*Line).Sfs[i].AcGn*NumOfGainLev + (*Line).Sfs[i].Mamp ;
            if ( WrkRate == Rate63 )
                Temp += (Word32) (*Line).Sfs[i].Tran << 11 ;
            Bsp = Par2Ser( Temp, Bsp, 12 ) ;
        }