g722_encode.c File Reference

#include <stdio.h>
#include <inttypes.h>
#include <memory.h>
#include <stdlib.h>
#include "g722.h"

Include dependency graph for g722_encode.c:

Go to the source code of this file.

Macros
#define	FALSE   0
#define	TRUE   (!FALSE)

Functions
static void	block4 (g722_encode_state_t *s, int band, int d)
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)
static __inline__ int16_t	saturate (int32_t amp)

Macro Definition Documentation

FALSE

#define FALSE   0

Definition at line 43 of file g722_encode.c.

Referenced by g722_encode_init().

TRUE

#define TRUE   (!FALSE)

Definition at line 46 of file g722_encode.c.

Referenced by g722_encode_init().

Function Documentation

block4()

static void block4 ( g722_encode_state_t *  s, int  band, int  d  )

static

Definition at line 63 of file g722_encode.c.

References g722_encode_state_t::a, g722_encode_state_t::ap, g722_encode_state_t::b, g722_encode_state_t::band, g722_encode_state_t::bp, g722_encode_state_t::d, d, g722_encode_state_t::p, g722_encode_state_t::r, g722_encode_state_t::s, saturate(), g722_encode_state_t::sg, g722_encode_state_t::sp, and g722_encode_state_t::sz.

Referenced by g722_encode().

{
 int wd1;
 int wd2;
 int wd3;
 int i;

 /* Block 4, RECONS */
 s->band[band].d[0] = d;
 s->band[band].r[0] = saturate(s->band[band].s + d);

 /* Block 4, PARREC */
 s->band[band].p[0] = saturate(s->band[band].sz + d);

 /* Block 4, UPPOL2 */
 for (i = 0; i < 3; i++)
 s->band[band].sg[i] = s->band[band].p[i] >> 15;
 wd1 = saturate(s->band[band].a[1] << 2);

 wd2 = (s->band[band].sg[0] == s->band[band].sg[1]) ? -wd1 : wd1;
 if (wd2 > 32767)
 wd2 = 32767;
 wd3 = (wd2 >> 7) + ((s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128);
 wd3 += (s->band[band].a[2]*32512) >> 15;
 if (wd3 > 12288)
 wd3 = 12288;
 else if (wd3 < -12288)
 wd3 = -12288;
 s->band[band].ap[2] = wd3;

 /* Block 4, UPPOL1 */
 s->band[band].sg[0] = s->band[band].p[0] >> 15;
 s->band[band].sg[1] = s->band[band].p[1] >> 15;
 wd1 = (s->band[band].sg[0] == s->band[band].sg[1]) ? 192 : -192;
 wd2 = (s->band[band].a[1]*32640) >> 15;

 s->band[band].ap[1] = saturate(wd1 + wd2);
 wd3 = saturate(15360 - s->band[band].ap[2]);
 if (s->band[band].ap[1] > wd3)
 s->band[band].ap[1] = wd3;
 else if (s->band[band].ap[1] < -wd3)
 s->band[band].ap[1] = -wd3;

 /* Block 4, UPZERO */
 wd1 = (d == 0) ? 0 : 128;
 s->band[band].sg[0] = d >> 15;
 for (i = 1; i < 7; i++)
 {
 s->band[band].sg[i] = s->band[band].d[i] >> 15;
 wd2 = (s->band[band].sg[i] == s->band[band].sg[0]) ? wd1 : -wd1;
 wd3 = (s->band[band].b[i]*32640) >> 15;
 s->band[band].bp[i] = saturate(wd2 + wd3);
 }

 /* Block 4, DELAYA */
 for (i = 6; i > 0; i--)
 {
 s->band[band].d[i] = s->band[band].d[i - 1];
 s->band[band].b[i] = s->band[band].bp[i];
 }

 for (i = 2; i > 0; i--)
 {
 s->band[band].r[i] = s->band[band].r[i - 1];
 s->band[band].p[i] = s->band[band].p[i - 1];
 s->band[band].a[i] = s->band[band].ap[i];
 }

 /* Block 4, FILTEP */
 wd1 = saturate(s->band[band].r[1] + s->band[band].r[1]);
 wd1 = (s->band[band].a[1]*wd1) >> 15;
 wd2 = saturate(s->band[band].r[2] + s->band[band].r[2]);
 wd2 = (s->band[band].a[2]*wd2) >> 15;
 s->band[band].sp = saturate(wd1 + wd2);

 /* Block 4, FILTEZ */
 s->band[band].sz = 0;
 for (i = 6; i > 0; i--)
 {
 wd1 = saturate(s->band[band].d[i] + s->band[band].d[i]);
 s->band[band].sz += (s->band[band].b[i]*wd1) >> 15;
 }
 s->band[band].sz = saturate(s->band[band].sz);

 /* Block 4, PREDIC */
 s->band[band].s = saturate(s->band[band].sp + s->band[band].sz);
}

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;
}

saturate()

static __inline__ int16_t saturate ( int32_t  amp )

static

Definition at line 49 of file g722_encode.c.

References INT16_MAX, and INT16_MIN.

Referenced by block4(), and g722_encode().

{
 int16_t amp16;

 /* Hopefully this is optimised for the common case - not clipping */
 amp16 = (int16_t) amp;
 if (amp == amp16)
 return amp16;
 if (amp > INT16_MAX)
 return INT16_MAX;
 return INT16_MIN;
}