408 lines
12 KiB
C
408 lines
12 KiB
C
|
/*
|
||
|
|
* 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,v 1.15 2006/07/07 16:37:49 steveu Exp $
|
||
|
|
*
|
||
|
|
* Modifications for WebRtc, 2011/04/28, by tlegrand:
|
||
|
|
* -Removed usage of inttypes.h and tgmath.h
|
||
|
|
* -Changed to use WebRtc types
|
||
|
|
* -Changed __inline__ to __inline
|
||
|
|
* -Added saturation check on output
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*! \file */
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
#include <config.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <memory.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#include "typedefs.h"
|
||
|
|
#include "g722_enc_dec.h"
|
||
|
|
|
||
|
|
|
||
|
|
#if !defined(FALSE)
|
||
|
|
#define FALSE 0
|
||
|
|
#endif
|
||
|
|
#if !defined(TRUE)
|
||
|
|
#define TRUE (!FALSE)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static __inline WebRtc_Word16 saturate(WebRtc_Word32 amp)
|
||
|
|
{
|
||
|
|
WebRtc_Word16 amp16;
|
||
|
|
|
||
|
|
/* Hopefully this is optimised for the common case - not clipping */
|
||
|
|
amp16 = (WebRtc_Word16) amp;
|
||
|
|
if (amp == amp16)
|
||
|
|
return amp16;
|
||
|
|
if (amp > WEBRTC_INT16_MAX)
|
||
|
|
return WEBRTC_INT16_MAX;
|
||
|
|
return WEBRTC_INT16_MIN;
|
||
|
|
}
|
||
|
|
/*- End of function --------------------------------------------------------*/
|
||
|
|
|
||
|
|
static void block4(g722_decode_state_t *s, int band, int d);
|
||
|
|
|
||
|
|
static void block4(g722_decode_state_t *s, int band, int d)
|
||
|
|
{
|
||
|
|
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 = (s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128;
|
||
|
|
wd3 += (wd2 >> 7);
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
/*- End of function --------------------------------------------------------*/
|
||
|
|
|
||
|
|
g722_decode_state_t *g722_decode_init(g722_decode_state_t *s, int rate, int options)
|
||
|
|
{
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
/*- End of function --------------------------------------------------------*/
|
||
|
|
|
||
|
|
int g722_decode_release(g722_decode_state_t *s)
|
||
|
|
{
|
||
|
|
free(s);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
/*- End of function --------------------------------------------------------*/
|
||
|
|
|
||
|
|
int g722_decode(g722_decode_state_t *s, WebRtc_Word16 amp[],
|
||
|
|
const WebRtc_UWord8 g722_data[], int len)
|
||
|
|
{
|
||
|
|
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++] = (WebRtc_Word16) (rlow << 1);
|
||
|
|
amp[outlen++] = (WebRtc_Word16) (rhigh << 1);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (s->eight_k)
|
||
|
|
{
|
||
|
|
amp[outlen++] = (WebRtc_Word16) (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];
|
||
|
|
}
|
||
|
|
/* We shift by 12 to allow for the QMF filters (DC gain = 4096), less 1
|
||
|
|
to allow for the 15 bit input to the G.722 algorithm. */
|
||
|
|
/* WebRtc, tlegrand: added saturation */
|
||
|
|
amp[outlen++] = saturate(xout1 >> 11);
|
||
|
|
amp[outlen++] = saturate(xout2 >> 11);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return outlen;
|
||
|
|
}
|
||
|
|
/*- End of function --------------------------------------------------------*/
|
||
|
|
/*- End of file ------------------------------------------------------------*/
|