/*
* SpanDSP - a series of DSP components for telephony
*
* g722_decode.c - The ITU G.722 codec, decode part.
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2005 Steve Underwood
*
* Despite my general liking of the GPL, I place my own contributions
* to this code in the public domain for the benefit of all mankind -
* even the slimy ones who might try to proprietize my work and use it
* to my detriment.
*
* Based in part on a single channel G.722 codec which is:
*
* Copyright (c) CMU 1993
* Computer Science, Speech Group
* Chengxiang Lu and Alex Hauptmann
*
* $Id: g722_decode.c 194722 2009-05-15 17:59:08Z russell $
*/
/*! \file */
#include <string.h>
#include <inttypes.h>
#include <stdlib.h>
#include "g722_typedefs.h"
#include "g722_enc_dec.h"
#if !defined(FALSE)
#define FALSE 0
#endif
#if !defined(TRUE)
#define TRUE (!FALSE)
#endif
#define PACKED_INPUT (0)
#define BITS_PER_SAMPLE (8)
#ifndef BUILD_FEATURE_G722_USE_INTRINSIC_SAT
static __inline int16_t __ssat16(int32_t amp)
{
int16_t amp16;
/* Hopefully this is optimised for the common case - not clipping */
amp16 = (int16_t) amp;
if (amp == amp16)
return amp16;
if (amp > 0x7fff)
return 0x7fff;
return 0x8000;
}
/*- End of function --------------------------------------------------------*/
#else
static __inline int16_t __ssat16( int32_t val)
{
register int32_t res;
__asm volatile (
"SSAT %0, #16, %1\n\t"
:"=r"(res)
:"r"(val)
:);
return (int16_t)res;
}
#endif
/*- End of function --------------------------------------------------------*/
static void block4(g722_band_t *band, int d);
static void block4(g722_band_t *band, int d)
{
int wd1;
int wd2;
int wd3;
int i;
int sg[7];
int ap1, ap2;
int sg0, sgi;
int sz;
/* Block 4, RECONS */
band->d[0] = d;
band->r[0] = __ssat16(band->s + d);
/* Block 4, PARREC */
band->p[0] = __ssat16(band->sz + d);
/* Block 4, UPPOL2 */
for (i = 0; i < 3; i++)
{
sg[i] = band->p[i] >> 15;
}
wd1 = __ssat16(band->a[1] << 2);
wd2 = (sg[0] == sg[1]) ? -wd1 : wd1;
if (wd2 > 32767)
wd2 = 32767;
ap2 = (sg[0] == sg[2]) ? 128 : -128;
ap2 += (wd2 >> 7);
ap2 += (band->a[2]*32512) >> 15;
if (ap2 > 12288)
ap2 = 12288;
else if (ap2 < -12288)
ap2 = -12288;
band->ap[2] = ap2;
/* Block 4, UPPOL1 */
sg[0] = band->p[0] >> 15;
sg[1] = band->p[1] >> 15;
wd1 = (sg[0] == sg[1]) ? 192 : -192;
wd2 = (band->a[1]*32640) >> 15;
ap1 = __ssat16(wd1 + wd2);
wd3 = __ssat16(15360 - band->ap[2]);
if (ap1 > wd3)
ap1 = wd3;
else if (ap1 < -wd3)
ap1 = -wd3;
band->ap[1] = ap1;
/* Block 4, UPZERO */
/* Block 4, FILTEZ */
wd1 = (d == 0) ? 0 : 128;
sg0 = sg[0] = d >> 15;
for (i = 1; i < 7; i++)
{
sgi = band->d[i] >> 15;
wd2 = (sgi == sg0) ? wd1 : -wd1;
wd3 = (band->b[i]*32640) >> 15;
band->bp[i] = __ssat16(wd2 + wd3);
}
/* Block 4, DELAYA */
sz = 0;
for (i = 6; i > 0; i--)
{
int bi;
band->d[i] = band->d[i - 1];
bi = band->b[i] = band->bp[i];
wd1 = __ssat16(band->d[i] + band->d[i]);
sz += (bi*wd1) >> 15;
}
band->sz = sz;
for (i = 2; i > 0; i--)
{
band->r[i] = band->r[i - 1];
band->p[i] = band->p[i - 1];
band->a[i] = band->ap[i];
}
/* Block 4, FILTEP */
wd1 = __ssat16(band->r[1] + band->r[1]);
wd1 = (band->a[1]*wd1) >> 15;
wd2 = __ssat16(band->r[2] + band->r[2]);
wd2 = (band->a[2]*wd2) >> 15;
band->sp = __ssat16(wd1 + wd2);
/* Block 4, PREDIC */
band->s = __ssat16(band->sp + band->sz);
}
/*- End of function --------------------------------------------------------*/
g722_decode_state_t *g722_decode_init(g722_decode_state_t *s, unsigned int rate, int options)
{
if (s == NULL)
{
#ifdef G722_SUPPORT_MALLOC
if ((s = (g722_decode_state_t *) malloc(sizeof(*s))) == NULL)
#endif
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;
s->dac_pcm = options & G722_FORMAT_DAC12;
s->band[0].det = 32;
s->band[1].det = 8;
return s;
}
/*- End of function --------------------------------------------------------*/
int g722_decode_release(g722_decode_state_t *s)
{
free(s);
return 0;
}
/*- End of function --------------------------------------------------------*/
static int16_t wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 };
static int16_t rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 };
static int16_t 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 int16_t wh[3] = {0, -214, 798};
static int16_t rh2[4] = {2, 1, 2, 1};
static int16_t qm2[4] = {-7408, -1616, 7408, 1616};
static int16_t qm4[16] =
{
0, -20456, -12896, -8968,
-6288, -4240, -2584, -1200,
20456, 12896, 8968, 6288,
4240, 2584, 1200, 0
};
#if 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
};
#endif
static int16_t 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 int16_t qmf_coeffs_even[12] =
{
3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11,
};
static int16_t qmf_coeffs_odd[12] =
{
-11, 53, -156, 362, -805, 3876, 951, -210, 32, 12, -11, 3
};
uint32_t g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len, uint16_t gain)
{
int dlowt;
int rlow;
int ihigh;
int dhigh;
int rhigh;
int xout1;
int xout2;
int wd1;
int wd2;
int wd3;
int code;
uint32_t outlen;
int i;
int j;
outlen = 0;
rhigh = 0;
for (j = 0; j < len; )
{
#if PACKED_INPUT == 1
/* 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++];
#endif
#if BITS_PER_SAMPLE == 8
wd1 = code & 0x3F;
ihigh = (code >> 6) & 0x03;
wd2 = qm6[wd1];
wd1 >>= 2;
#elif BITS_PER_SAMPLE == 7
wd1 = code & 0x1F;
ihigh = (code >> 5) & 0x03;
wd2 = qm5[wd1];
wd1 >>= 1;
#elif BITS_PER_SAMPLE == 6
wd1 = code & 0x0F;
ihigh = (code >> 4) & 0x03;
wd2 = qm4[wd1];
#endif
/* Block 5L, LOW BAND INVQBL */
wd2 = (s->band[0].det*wd2) >> 15;
/* Block 5L, RECONS */
rlow = s->band[0].s + wd2;
/* Block 6L, LIMIT */
// ANDREA
// rlow=ssat(rlow,2<<14)
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->band[0], dlowt);
/* 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 */
// ANDREA
// rhigh=ssat(rhigh,2<<14)
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->band[1], dhigh);
/* 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;
// we should get PERF numbers for the following loop
xout1 = 0;
xout2 = 0;
for (i = 0; i < 12; i++)
{
xout2 += s->x[2*i] * qmf_coeffs_even[i];
xout1 += s->x[2*i+1] * qmf_coeffs_odd[i];
}
xout1 = NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN((int16_t) __ssat16(xout1 >> 11), gain);
xout2 = NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN((int16_t) __ssat16(xout2 >> 11), gain);
if (s->dac_pcm)
{
amp[outlen++] = ((int16_t) (xout1 >> 4) + 2048);
amp[outlen++] = ((int16_t) (xout2 >> 4) + 2048);
}
else
{
amp[outlen++] = xout1;
amp[outlen++] = xout2;
}
}
return outlen;
}
/*- End of function --------------------------------------------------------*/
/*- End of file ------------------------------------------------------------*/