g722.h File Reference

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Data Structures
struct	g722_decode_state_t
struct	g722_encode_state_t

Macros
#define	INT16_MAX   32767
#define	INT16_MIN   (-32768)

Enumerations
enum	{ G722_SAMPLE_RATE_8000 = 0x0001, G722_PACKED = 0x0002 }

Functions
int	g722_decode (g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len)
g722_decode_state_t *	g722_decode_init (g722_decode_state_t *s, int rate, int options)
int	g722_decode_release (g722_decode_state_t *s)
int	g722_encode (g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len)
g722_encode_state_t *	g722_encode_init (g722_encode_state_t *s, int rate, int options)
int	g722_encode_release (g722_encode_state_t *s)

Macro Definition Documentation

INT16_MAX

#define INT16_MAX   32767

Definition at line 50 of file g722.h.

Referenced by saturate().

INT16_MIN

#define INT16_MIN   (-32768)

Definition at line 53 of file g722.h.

Referenced by saturate().

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
G722_SAMPLE_RATE_8000
G722_PACKED

Definition at line 43 of file g722.h.

{
    G722_SAMPLE_RATE_8000 = 0x0001,
    G722_PACKED = 0x0002
};

Function Documentation

g722_decode()

int g722_decode	(	g722_decode_state_t *	s,
		int16_t	amp[],
		const uint8_t	g722_data[],
		int	len
	)

Definition at line 186 of file g722_decode.c.

References g722_decode_state_t::band, g722_decode_state_t::bits_per_sample, block4(), g722_decode_state_t::det, g722_decode_state_t::eight_k, g722_decode_state_t::in_bits, g722_decode_state_t::in_buffer, g722_decode_state_t::itu_test_mode, len(), g722_decode_state_t::nb, g722_decode_state_t::packed, g722_decode_state_t::s, and g722_decode_state_t::x.

Referenced by g722tolin_framein().

{
    static const int wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 };
    static const int rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3,  2, 1, 0 };
    static const int ilb[32] =
    {
        2048, 2093, 2139, 2186, 2233, 2282, 2332,
        2383, 2435, 2489, 2543, 2599, 2656, 2714,
        2774, 2834, 2896, 2960, 3025, 3091, 3158,
        3228, 3298, 3371, 3444, 3520, 3597, 3676,
        3756, 3838, 3922, 4008
    };
    static const int wh[3] = {0, -214, 798};
    static const int rh2[4] = {2, 1, 2, 1};
    static const int qm2[4] = {-7408, -1616,  7408,   1616};
    static const int qm4[16] =
    {
              0, -20456, -12896,  -8968,
          -6288,  -4240,  -2584,  -1200,
          20456,  12896,   8968,   6288,
           4240,   2584,   1200,      0
    };
    static const int qm5[32] =
    {
           -280,   -280, -23352, -17560,
         -14120, -11664,  -9752,  -8184,
          -6864,  -5712,  -4696,  -3784,
          -2960,  -2208,  -1520,   -880,
          23352,  17560,  14120,  11664,
           9752,   8184,   6864,   5712,
           4696,   3784,   2960,   2208,
           1520,    880,    280,   -280
    };
    static const int qm6[64] =
    {
           -136,   -136,   -136,   -136,
         -24808, -21904, -19008, -16704,
         -14984, -13512, -12280, -11192,
         -10232,  -9360,  -8576,  -7856,
          -7192,  -6576,  -6000,  -5456,
          -4944,  -4464,  -4008,  -3576,
          -3168,  -2776,  -2400,  -2032,
          -1688,  -1360,  -1040,   -728,
          24808,  21904,  19008,  16704,
          14984,  13512,  12280,  11192,
          10232,   9360,   8576,   7856,
           7192,   6576,   6000,   5456,
           4944,   4464,   4008,   3576,
           3168,   2776,   2400,   2032,
           1688,   1360,   1040,    728,
            432,    136,   -432,   -136
    };
    static const int qmf_coeffs[12] =
    {
           3,  -11,   12,   32, -210,  951, 3876, -805,  362, -156,   53,  -11,
    };

    int dlowt;
    int rlow;
    int ihigh;
    int dhigh;
    int rhigh;
    int xout1;
    int xout2;
    int wd1;
    int wd2;
    int wd3;
    int code;
    int outlen;
    int i;
    int j;

    outlen = 0;
    rhigh = 0;
    for (j = 0;  j < len;  )
    {
        if (s->packed)
        {
            /* Unpack the code bits */
            if (s->in_bits < s->bits_per_sample)
            {
                s->in_buffer |= (g722_data[j++] << s->in_bits);
                s->in_bits += 8;
            }
            code = s->in_buffer & ((1 << s->bits_per_sample) - 1);
            s->in_buffer >>= s->bits_per_sample;
            s->in_bits -= s->bits_per_sample;
        }
        else
        {
            code = g722_data[j++];
        }

        switch (s->bits_per_sample)
        {
        default:
        case 8:
            wd1 = code & 0x3F;
            ihigh = (code >> 6) & 0x03;
            wd2 = qm6[wd1];
            wd1 >>= 2;
            break;
        case 7:
            wd1 = code & 0x1F;
            ihigh = (code >> 5) & 0x03;
            wd2 = qm5[wd1];
            wd1 >>= 1;
            break;
        case 6:
            wd1 = code & 0x0F;
            ihigh = (code >> 4) & 0x03;
            wd2 = qm4[wd1];
            break;
        }
        /* Block 5L, LOW BAND INVQBL */
        wd2 = (s->band[0].det*wd2) >> 15;
        /* Block 5L, RECONS */
        rlow = s->band[0].s + wd2;
        /* Block 6L, LIMIT */
        if (rlow > 16383)
            rlow = 16383;
        else if (rlow < -16384)
            rlow = -16384;

        /* Block 2L, INVQAL */
        wd2 = qm4[wd1];
        dlowt = (s->band[0].det*wd2) >> 15;

        /* Block 3L, LOGSCL */
        wd2 = rl42[wd1];
        wd1 = (s->band[0].nb*127) >> 7;
        wd1 += wl[wd2];
        if (wd1 < 0)
            wd1 = 0;
        else if (wd1 > 18432)
            wd1 = 18432;
        s->band[0].nb = wd1;

        /* Block 3L, SCALEL */
        wd1 = (s->band[0].nb >> 6) & 31;
        wd2 = 8 - (s->band[0].nb >> 11);
        wd3 = (wd2 < 0)  ?  (ilb[wd1] << -wd2)  :  (ilb[wd1] >> wd2);
        s->band[0].det = wd3 << 2;

        block4(s, 0, dlowt);

        if (!s->eight_k)
        {
            /* Block 2H, INVQAH */
            wd2 = qm2[ihigh];
            dhigh = (s->band[1].det*wd2) >> 15;
            /* Block 5H, RECONS */
            rhigh = dhigh + s->band[1].s;
            /* Block 6H, LIMIT */
            if (rhigh > 16383)
                rhigh = 16383;
            else if (rhigh < -16384)
                rhigh = -16384;

            /* Block 2H, INVQAH */
            wd2 = rh2[ihigh];
            wd1 = (s->band[1].nb*127) >> 7;
            wd1 += wh[wd2];
            if (wd1 < 0)
                wd1 = 0;
            else if (wd1 > 22528)
                wd1 = 22528;
            s->band[1].nb = wd1;

            /* Block 3H, SCALEH */
            wd1 = (s->band[1].nb >> 6) & 31;
            wd2 = 10 - (s->band[1].nb >> 11);
            wd3 = (wd2 < 0)  ?  (ilb[wd1] << -wd2)  :  (ilb[wd1] >> wd2);
            s->band[1].det = wd3 << 2;

            block4(s, 1, dhigh);
        }

        if (s->itu_test_mode)
        {
            amp[outlen++] = (int16_t) (rlow << 1);
            amp[outlen++] = (int16_t) (rhigh << 1);
        }
        else
        {
            if (s->eight_k)
            {
                amp[outlen++] = (int16_t) (rlow << 1);
            }
            else
            {
                /* Apply the receive QMF */
                for (i = 0;  i < 22;  i++)
                    s->x[i] = s->x[i + 2];
                s->x[22] = rlow + rhigh;
                s->x[23] = rlow - rhigh;

                xout1 = 0;
                xout2 = 0;
                for (i = 0;  i < 12;  i++)
                {
                    xout2 += s->x[2*i]*qmf_coeffs[i];
                    xout1 += s->x[2*i + 1]*qmf_coeffs[11 - i];
                }
                amp[outlen++] = (int16_t) (xout1 >> 11);
                amp[outlen++] = (int16_t) (xout2 >> 11);
            }
        }
    }
    return outlen;
}

g722_decode_init()

g722_decode_state_t* g722_decode_init	(	g722_decode_state_t *	s,
		int	rate,
		int	options
	)

Definition at line 153 of file g722_decode.c.

References g722_decode_state_t::band, g722_decode_state_t::bits_per_sample, g722_decode_state_t::det, g722_decode_state_t::eight_k, FALSE, G722_PACKED, G722_SAMPLE_RATE_8000, malloc(), NULL, g722_decode_state_t::packed, and TRUE.

Referenced by g722tolin16_new(), and g722tolin_new().

{
    if (s == NULL)
    {
        if ((s = (g722_decode_state_t *) malloc(sizeof(*s))) == NULL)
            return NULL;
    }
    memset(s, 0, sizeof(*s));
    if (rate == 48000)
        s->bits_per_sample = 6;
    else if (rate == 56000)
        s->bits_per_sample = 7;
    else
        s->bits_per_sample = 8;
    if ((options & G722_SAMPLE_RATE_8000))
        s->eight_k = TRUE;
    if ((options & G722_PACKED)  &&  s->bits_per_sample != 8)
        s->packed = TRUE;
    else
        s->packed = FALSE;
    s->band[0].det = 32;
    s->band[1].det = 8;
    return s;
}

g722_decode_release()

int g722_decode_release

(

g722_decode_state_t *

s

)

Definition at line 179 of file g722_decode.c.

References free().

{
    free(s);
    return 0;
}

g722_encode()

int g722_encode	(	g722_encode_state_t *	s,
		uint8_t	g722_data[],
		const int16_t	amp[],
		int	len
	)

Definition at line 185 of file g722_encode.c.

References g722_encode_state_t::band, g722_encode_state_t::bits_per_sample, block4(), g722_encode_state_t::det, g722_encode_state_t::eight_k, el, g722_encode_state_t::itu_test_mode, len(), g722_encode_state_t::nb, g722_encode_state_t::out_bits, g722_encode_state_t::out_buffer, g722_encode_state_t::packed, g722_encode_state_t::s, saturate(), and g722_encode_state_t::x.

Referenced by lintog722_framein().

{
    static const int q6[32] =
    {
           0,   35,   72,  110,  150,  190,  233,  276,
         323,  370,  422,  473,  530,  587,  650,  714,
         786,  858,  940, 1023, 1121, 1219, 1339, 1458,
        1612, 1765, 1980, 2195, 2557, 2919,    0,    0
    };
    static const int iln[32] =
    {
         0, 63, 62, 31, 30, 29, 28, 27,
        26, 25, 24, 23, 22, 21, 20, 19,
        18, 17, 16, 15, 14, 13, 12, 11,
        10,  9,  8,  7,  6,  5,  4,  0
    };
    static const int ilp[32] =
    {
         0, 61, 60, 59, 58, 57, 56, 55,
        54, 53, 52, 51, 50, 49, 48, 47,
        46, 45, 44, 43, 42, 41, 40, 39,
        38, 37, 36, 35, 34, 33, 32,  0
    };
    static const int wl[8] =
    {
        -60, -30, 58, 172, 334, 538, 1198, 3042
    };
    static const int rl42[16] =
    {
        0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0
    };
    static const int ilb[32] =
    {
        2048, 2093, 2139, 2186, 2233, 2282, 2332,
        2383, 2435, 2489, 2543, 2599, 2656, 2714,
        2774, 2834, 2896, 2960, 3025, 3091, 3158,
        3228, 3298, 3371, 3444, 3520, 3597, 3676,
        3756, 3838, 3922, 4008
    };
    static const int qm4[16] =
    {
             0, -20456, -12896, -8968,
         -6288,  -4240,  -2584, -1200,
         20456,  12896,   8968,  6288,
          4240,   2584,   1200,     0
    };
    static const int qm2[4] =
    {
        -7408,  -1616,   7408,   1616
    };
    static const int qmf_coeffs[12] =
    {
           3,  -11,   12,   32, -210,  951, 3876, -805,  362, -156,   53,  -11,
    };
    static const int ihn[3] = {0, 1, 0};
    static const int ihp[3] = {0, 3, 2};
    static const int wh[3] = {0, -214, 798};
    static const int rh2[4] = {2, 1, 2, 1};

    int dlow;
    int dhigh;
    int el;
    int wd;
    int wd1;
    int ril;
    int wd2;
    int il4;
    int ih2;
    int wd3;
    int eh;
    int mih;
    int i;
    int j;
    /* Low and high band PCM from the QMF */
    int xlow;
    int xhigh;
    int g722_bytes;
    /* Even and odd tap accumulators */
    int sumeven;
    int sumodd;
    int ihigh;
    int ilow;
    int code;

    g722_bytes = 0;
    xhigh = 0;
    for (j = 0;  j < len;  )
    {
        if (s->itu_test_mode)
        {
            xlow =
            xhigh = amp[j++] >> 1;
        }
        else
        {
            if (s->eight_k)
            {
                xlow = amp[j++] >> 1;
            }
            else
            {
                /* Apply the transmit QMF */
                /* Shuffle the buffer down */
                for (i = 0;  i < 22;  i++)
                    s->x[i] = s->x[i + 2];
                s->x[22] = amp[j++];
                s->x[23] = amp[j++];

                /* Discard every other QMF output */
                sumeven = 0;
                sumodd = 0;
                for (i = 0;  i < 12;  i++)
                {
                    sumodd += s->x[2*i]*qmf_coeffs[i];
                    sumeven += s->x[2*i + 1]*qmf_coeffs[11 - i];
                }
                xlow = (sumeven + sumodd) >> 14;
                xhigh = (sumeven - sumodd) >> 14;
            }
        }
        /* Block 1L, SUBTRA */
        el = saturate(xlow - s->band[0].s);

        /* Block 1L, QUANTL */
        wd = (el >= 0)  ?  el  :  -(el + 1);

        for (i = 1;  i < 30;  i++)
        {
            wd1 = (q6[i]*s->band[0].det) >> 12;
            if (wd < wd1)
                break;
        }
        ilow = (el < 0)  ?  iln[i]  :  ilp[i];

        /* Block 2L, INVQAL */
        ril = ilow >> 2;
        wd2 = qm4[ril];
        dlow = (s->band[0].det*wd2) >> 15;

        /* Block 3L, LOGSCL */
        il4 = rl42[ril];
        wd = (s->band[0].nb*127) >> 7;
        s->band[0].nb = wd + wl[il4];
        if (s->band[0].nb < 0)
            s->band[0].nb = 0;
        else if (s->band[0].nb > 18432)
            s->band[0].nb = 18432;

        /* Block 3L, SCALEL */
        wd1 = (s->band[0].nb >> 6) & 31;
        wd2 = 8 - (s->band[0].nb >> 11);
        wd3 = (wd2 < 0)  ?  (ilb[wd1] << -wd2)  :  (ilb[wd1] >> wd2);
        s->band[0].det = wd3 << 2;

        block4(s, 0, dlow);

        if (s->eight_k)
        {
            /* Just leave the high bits as zero */
            code = (0xC0 | ilow) >> (8 - s->bits_per_sample);
        }
        else
        {
            /* Block 1H, SUBTRA */
            eh = saturate(xhigh - s->band[1].s);

            /* Block 1H, QUANTH */
            wd = (eh >= 0)  ?  eh  :  -(eh + 1);
            wd1 = (564*s->band[1].det) >> 12;
            mih = (wd >= wd1)  ?  2  :  1;
            ihigh = (eh < 0)  ?  ihn[mih]  :  ihp[mih];

            /* Block 2H, INVQAH */
            wd2 = qm2[ihigh];
            dhigh = (s->band[1].det*wd2) >> 15;

            /* Block 3H, LOGSCH */
            ih2 = rh2[ihigh];
            wd = (s->band[1].nb*127) >> 7;
            s->band[1].nb = wd + wh[ih2];
            if (s->band[1].nb < 0)
                s->band[1].nb = 0;
            else if (s->band[1].nb > 22528)
                s->band[1].nb = 22528;

            /* Block 3H, SCALEH */
            wd1 = (s->band[1].nb >> 6) & 31;
            wd2 = 10 - (s->band[1].nb >> 11);
            wd3 = (wd2 < 0)  ?  (ilb[wd1] << -wd2)  :  (ilb[wd1] >> wd2);
            s->band[1].det = wd3 << 2;

            block4(s, 1, dhigh);
            code = ((ihigh << 6) | ilow) >> (8 - s->bits_per_sample);
        }

        if (s->packed)
        {
            /* Pack the code bits */
            s->out_buffer |= (code << s->out_bits);
            s->out_bits += s->bits_per_sample;
            if (s->out_bits >= 8)
            {
                g722_data[g722_bytes++] = (uint8_t) (s->out_buffer & 0xFF);
                s->out_bits -= 8;
                s->out_buffer >>= 8;
            }
        }
        else
        {
            g722_data[g722_bytes++] = (uint8_t) code;
        }
    }
    return g722_bytes;
}

g722_encode_init()

g722_encode_state_t* g722_encode_init	(	g722_encode_state_t *	s,
		int	rate,
		int	options
	)

Definition at line 152 of file g722_encode.c.

References g722_encode_state_t::band, g722_encode_state_t::bits_per_sample, g722_encode_state_t::det, g722_encode_state_t::eight_k, FALSE, G722_PACKED, G722_SAMPLE_RATE_8000, malloc(), NULL, g722_encode_state_t::packed, and TRUE.

Referenced by lin16tog722_new(), and lintog722_new().

{
    if (s == NULL)
    {
        if ((s = (g722_encode_state_t *) malloc(sizeof(*s))) == NULL)
            return NULL;
    }
    memset(s, 0, sizeof(*s));
    if (rate == 48000)
        s->bits_per_sample = 6;
    else if (rate == 56000)
        s->bits_per_sample = 7;
    else
        s->bits_per_sample = 8;
    if ((options & G722_SAMPLE_RATE_8000))
        s->eight_k = TRUE;
    if ((options & G722_PACKED)  &&  s->bits_per_sample != 8)
        s->packed = TRUE;
    else
        s->packed = FALSE;
    s->band[0].det = 32;
    s->band[1].det = 8;
    return s;
}

g722_encode_release()

int g722_encode_release

(

g722_encode_state_t *

s

)

Definition at line 178 of file g722_encode.c.

References free().

{
    free(s);
    return 0;
}