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

        /* Write all the Grid indices */
        for ( i = 0 ; i < SubFrames ; i ++ )
            *Bsp ++ = (Word16)(*Line).Sfs[i].Grid ;

        /* High rate only part */
        if ( WrkRate == Rate63 ) {

            /* Write the reserved bit as 0 */
            *Bsp ++ = (Word16) 0 ;

            /* Write 13 bit combined position index */
            Temp = (*Line).Sfs[0].Ppos >> 16 ;
            Temp = Temp * 9 + ( (*Line).Sfs[1].Ppos >> 14) ;
            Temp *= 90 ;
            Temp += ((*Line).Sfs[2].Ppos >> 16) * 9 + ( (*Line).Sfs[3].Ppos >> 14 ) ;
            Bsp = Par2Ser( Temp, Bsp, 13 ) ;

            /* Write all the pulse positions */
            Temp = (*Line).Sfs[0].Ppos & 0x0000ffffL ;
            Bsp = Par2Ser( Temp, Bsp, 16 ) ;

            Temp = (*Line).Sfs[1].Ppos & 0x00003fffL ;
            Bsp = Par2Ser( Temp, Bsp, 14 ) ;

            Temp = (*Line).Sfs[2].Ppos & 0x0000ffffL ;
            Bsp = Par2Ser( Temp, Bsp, 16 ) ;

            Temp = (*Line).Sfs[3].Ppos & 0x00003fffL ;
            Bsp = Par2Ser( Temp, Bsp, 14 ) ;

            /* Write pulse amplitudes */
            Temp = (Word32) (*Line).Sfs[0].Pamp ;
            Bsp = Par2Ser( Temp, Bsp, 6 ) ;

            Temp = (Word32) (*Line).Sfs[1].Pamp ;
            Bsp = Par2Ser( Temp, Bsp, 5 ) ;

            Temp = (Word32) (*Line).Sfs[2].Pamp ;
            Bsp = Par2Ser( Temp, Bsp, 6 ) ;

            Temp = (Word32) (*Line).Sfs[3].Pamp ;
            Bsp = Par2Ser( Temp, Bsp, 5 ) ;
        }
        /* Low rate only part */
        else {

            /* Write 12 bits of positions */
            for ( i = 0 ; i < SubFrames ; i ++ ) {
                Temp = (*Line).Sfs[i].Ppos ;
                Bsp = Par2Ser( Temp, Bsp, 12 ) ;
            }

            /* Write 4 bit Pamps */
            for ( i = 0 ; i < SubFrames ; i ++ ) {
                Temp = (*Line).Sfs[i].Pamp ;
                Bsp = Par2Ser( Temp, Bsp, 4 ) ;
            }
        }

    }
    else if (Ftyp == 2) {    /* SID frame */

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

        /* Do Sid frame gain */
        Temp = (Word32)(*Line).Sfs[0].Mamp ;
        Bsp = Par2Ser( Temp, Bsp, 6 ) ;
    }

    /* Write out active frames */
    if (Ftyp == 1) {
        if ( WrkRate == Rate63 )
            BitCount = 192;
        else
            BitCount = 160;
    }
    /* Non active frames */
    else if (Ftyp == 2)
        BitCount = 32;
    else
        BitCount = 2;

    for ( i = 0 ; i < BitCount ; i ++ )
        Vout[i>>3] ^= BitStream[i] << (i & 0x0007) ;
}

Word16* Par2Ser( Word32 Inp, Word16 *Pnt, int BitNum )
{
    int     i;
    Word16  Temp ;

    for ( i = 0 ; i < BitNum ; i ++ ) {
        Temp = (Word16)(Inp & 0x0001);
        Inp >>= 1 ;
        *Pnt ++ = Temp ;
    }

    return Pnt ;
}

/*
**
** Function:        Line_Unpk()
**
** Description:     unpacking of bitstream, gets coding parameters for a frame
**
** Links to text:   Section 4
**
** Arguments:
**
**  char   *Vinp        bitstream chars
**  Word16 *Ftyp
**  Word16 Crc
**
** Outputs:
**
**  Word16 *Ftyp
**
** Return value:
**
**  LINEDEF             coded parameters
**     Word16   Crc
**     Word32   LspId
**     Word16   Olp[SubFrames/2]
**     SFSDEF   Sfs[SubFrames]
**
*/
LINEDEF  Line_Unpk(char *Vinp, Word16 *Ftyp, Word16 Crc)
{
    int     i  ;
    Word16  BitStream[192] ;
    Word16  *Bsp = BitStream ;
    LINEDEF Line ;
    Word32  Temp ;
    Word16  Info ;
    Word16  Bound_AcGn ;

    Line.Crc = Crc;
    if (Crc != 0)
        return Line;

    /* Unpack the byte info to BitStream vector */
    for ( i = 0 ; i < 192 ; i ++ )
        BitStream[i] = (Word16) (( Vinp[i>>3] >> (i & (Word16)0x0007) ) & 1);

    /* Decode the first two bits */
    Info = (Word16)Ser2Par( &Bsp, 2 ) ;

    if (Info == 3) {
        *Ftyp = 0;
        Line.LspId = 0L;    /* Dummy : to avoid Borland C3.1 warning */
        return Line;
    }

    /* Decode the LspId */
    Line.LspId = Ser2Par( &Bsp, 24 ) ;

    if (Info == 2) {
        /* Decode the Noise Gain */
        Line.Sfs[0].Mamp = (Word16)Ser2Par( &Bsp, 6);
        *Ftyp = 2;
        return Line ;
    }

    /*
     * Decode the common information to both rates
     */

    *Ftyp = 1;

    /* Decode the bit-rate */
    WrkRate = (Info == 0) ? Rate63 : Rate53;

    /* Decode the adaptive codebook lags */
    Temp = Ser2Par( &Bsp, 7 ) ;
    /* Test if forbidden code */
    if (Temp <= 123) {
        Line.Olp[0] = (Word16) Temp + (Word16)PitchMin ;
    }
    else {
        /* transmission error */
        Line.Crc = 1;
        return Line;
    }

    Line.Sfs[1].AcLg = (Word16) Ser2Par( &Bsp, 2 ) ;

    Temp = Ser2Par( &Bsp, 7 ) ;
    /* Test if forbidden code */
    if (Temp <= 123) {
        Line.Olp[1] = (Word16) Temp + (Word16)PitchMin ;
    }
    else {
        /* transmission error */
        Line.Crc = 1;
        return Line ;
    }

    Line.Sfs[3].AcLg = (Word16) Ser2Par( &Bsp, 2 ) ;

    Line.Sfs[0].AcLg = 1 ;
    Line.Sfs[2].AcLg = 1 ;

    /* Decode the combined gains accordingly to the rate */
    for ( i = 0 ; i < SubFrames ; i ++ ) {

        Temp = Ser2Par( &Bsp, 12 ) ;

        Line.Sfs[i].Tran = 0 ;

        Bound_AcGn = NbFilt170 ;
        if ( (WrkRate == Rate63) && (Line.Olp[i>>1] < (SubFrLen-2) ) ) {
            Line.Sfs[i].Tran = (Word16)(Temp >> 11) ;
            Temp &= 0x000007ffL ;
            Bound_AcGn = NbFilt085 ;
        }
        Line.Sfs[i].AcGn = (Word16)(Temp / (Word16)NumOfGainLev) ;

        if (Line.Sfs[i].AcGn < Bound_AcGn ) {
            Line.Sfs[i].Mamp = (Word16)(Temp % (Word16)NumOfGainLev) ;
        }
        else {
            /* error detected */
            Line.Crc = 1;
            return Line ;
        }
    }

    /* Decode the grids */
    for ( i = 0 ; i < SubFrames ; i ++ )
        Line.Sfs[i].Grid = *Bsp ++ ;

    if (Info == 0) {

        /* Skip the reserved bit */
        Bsp ++ ;

        /* Decode 13 bit combined position index */
        Temp = Ser2Par( &Bsp, 13 ) ;
        Line.Sfs[0].Ppos = ( Temp/90 ) / 9 ;
        Line.Sfs[1].Ppos = ( Temp/90 ) % 9 ;
        Line.Sfs[2].Ppos = ( Temp%90 ) / 9 ;
        Line.Sfs[3].Ppos = ( Temp%90 ) % 9 ;

        /* Decode all the pulse positions */
        Line.Sfs[0].Ppos = ( Line.Sfs[0].Ppos << 16 ) + Ser2Par( &Bsp, 16 ) ;
        Line.Sfs[1].Ppos = ( Line.Sfs[1].Ppos << 14 ) + Ser2Par( &Bsp, 14 ) ;
        Line.Sfs[2].Ppos = ( Line.Sfs[2].Ppos << 16 ) + Ser2Par( &Bsp, 16 ) ;
        Line.Sfs[3].Ppos = ( Line.Sfs[3].Ppos << 14 ) + Ser2Par( &Bsp, 14 ) ;

        /* Decode pulse amplitudes */
        Line.Sfs[0].Pamp = (Word16)Ser2Par( &Bsp, 6 ) ;
        Line.Sfs[1].Pamp = (Word16)Ser2Par( &Bsp, 5 ) ;
        Line.Sfs[2].Pamp = (Word16)Ser2Par( &Bsp, 6 ) ;
        Line.Sfs[3].Pamp = (Word16)Ser2Par( &Bsp, 5 ) ;
    }
    else {

        /* Decode the positions */
        for ( i = 0 ; i < SubFrames ; i ++ )
            Line.Sfs[i].Ppos = Ser2Par( &Bsp, 12 ) ;

        /* Decode the amplitudes */
        for ( i = 0 ; i < SubFrames ; i ++ )
            Line.Sfs[i].Pamp = (Word16)Ser2Par( &Bsp, 4 ) ;
    }
    return Line;
}

Word32  Ser2Par( Word16 **Pnt, int Count )
{
    int     i;
    Word32  Rez = 0L;

    for ( i = 0 ; i < Count ; i ++ ) {
        Rez += (Word32) **Pnt << i ;
        (*Pnt) ++ ;
    }
    return Rez ;
}


/*
**
** Function:        Rand_lbc()
**
** Description:     Generator of random numbers
**
** Links to text:   Section 3.10.2
**
** Arguments:
**
**  Word16   *p
**
** Outputs:
**
**  Word16   *p
**
** Return value:
**
**  Word16    random number
**
*/
Word16 Rand_lbc(Word16 *p)
{
    *p = (Word16)(((*p)*521L + 259) & 0x0000ffff);
    return(*p);
}


/*
**
** Function:        Scale()
**
** Description:     Postfilter gain scaling
**
** Links to text:   Section 3.9
**
** Arguments:
**
**  FLOAT *Tv
**  FLOAT  Sen
**
**  Inputs:
**
**  FLOAT DecStat.Gain
**
** Outputs:
**
**  FLOAT *Tv
**
** Return value:    None
**
*/
void  Scale(FLOAT *Tv, FLOAT Sen)
{
    int  i;

    FLOAT Acc1;
    FLOAT SfGain;

    Acc1 = DotProd(Tv,Tv,SubFrLen);

    if (Acc1 > (FLOAT) FLT_MIN)
        SfGain = (FLOAT) sqrt(Sen/Acc1) * (FLOAT)0.0625;
    else
        SfGain = (FLOAT)0.0625;

    /*
     * Update gain and scale the Postfiltered Signal
     */
    for (i=0; i < SubFrLen; i++)
    {
        DecStat.Gain = (FLOAT)0.9375*DecStat.Gain + SfGain;
        Tv[i] = (FLOAT)1.0625*Tv[i]*DecStat.Gain;
    }
}

/*
**
** Function:        DotProd()
**
** Description:     Dot product
**
** Links to text:   Section 3.9
**
** Arguments:
**
**  FLOAT *in1
**  FLOAT *in2
**  int   len
**
**  Inputs:
**
**  Outputs:
**
**  Return value:
**
**  FLOAT dot product
**
*/
FLOAT DotProd(FLOAT *in1, FLOAT *in2, int len)
{
    int   i;
    FLOAT sum;

    sum = (FLOAT)0.0;
    for (i=0; i<len; i++)
        sum += in1[i]*in2[i];

    return(sum);
}