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g722.cpp 27.36 KiB
/*
* Copyright (C) 2004, 2005, 2006, 2009, 2008, 2009, 2010, 2011 Savoir-Faire Linux Inc.
* Author: Alexandre Savard <alexandre.savard@savoirfairelinux.com>
*
* Motly borrowed from asterisk's sources (Steve Underwood <steveu@coppice.org>)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
* grants you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#include "../common.h"
#include "audiocodec.h"
#include "g722.h"
#include <stdlib.h>
#include <string.h>
#define TRUE 1
#define FALSE 0
class G722 : public AudioCodec
{
public:
G722 (int payload=9)
: AudioCodec (payload, "G722") {
_clockRate = 16000;
_frameSize = 320; // samples, 20 ms at 16kHz
_channel = 1;
_bitrate = 64;
_bandwidth = 80;
_hasDynamicPayload = false;
decode_s = new g722_decode_state_t;
encode_s = new g722_encode_state_t;
g722_decode_init ();
g722_encode_init ();
}
~G722() {
g722_decode_release(); g722_encode_release();
}
virtual int codecDecode (short *dst, unsigned char *src, unsigned int size) {
int in_byte = size;
int out_samples;
out_samples = g722_decode ( (int16_t*) dst, (const uint8_t*) src, in_byte);
return out_samples * 2;
}
virtual int codecEncode (unsigned char *dst, short *src, unsigned int size) {
// 2 bytes per sample (int16)
int in_samples = size / 2;
int out_bytes;
out_bytes = g722_encode ( (uint8_t*) dst, (const int16_t*) src, in_samples);
return out_bytes;
}
void g722_encode_init (void) {
encode_s->itu_test_mode = FALSE;
// 8 => 64 kbps; 7 => 56 kbps; 6 => 48 kbps
encode_s->bits_per_sample = 8;
// Enable 8khz mode, encode using lower subband only
encode_s->eight_k = FALSE;
// Never set packed TRUE when using 64 kbps
encode_s->packed = FALSE;
memset(encode_s->band, 0, sizeof(decode_s->band));
encode_s->band[0].det = 32;
encode_s->band[1].det = 8;
memset(encode_s->x, 0, sizeof(encode_s->x));
decode_s->in_buffer = 0;
decode_s->in_bits = 0;
decode_s->out_buffer = 0;
decode_s->out_bits = 0;
}
void g722_decode_init (void) {
decode_s->itu_test_mode = FALSE;
// 8 => 64 kbps; 7 => 56 kbps; 6 => 48 kbps
decode_s->bits_per_sample = 8;
// Enable 8khz mode, encode using lower subband only
decode_s->eight_k = FALSE;
// Never set packed TRUE when using 64 kbps
decode_s->packed = FALSE;
memset(decode_s->band, 0, sizeof(decode_s->band) * 2);
decode_s->band[0].det = 32;
decode_s->band[1].det = 8;
decode_s->in_bits = 0;
memset(decode_s->x, 0, sizeof(int) * 24);
decode_s->in_buffer = 0;
decode_s->in_bits = 0;
decode_s->out_buffer = 0;
decode_s->out_bits = 0;
}
int16_t saturate (int32_t amp) {
int16_t amp16 = 0;
/* 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;
}
void block4_encode (int band, int d) {
int wd1 = 0;
int wd2 = 0;
int wd3 = 0;
int i = 0;
/* Block 4, RECONS */
encode_s->band[band].d[0] = d;
encode_s->band[band].r[0] = saturate (encode_s->band[band].s + d);
/* Block 4, PARREC */
encode_s->band[band].p[0] = saturate (encode_s->band[band].sz + d);
/* Block 4, UPPOL2 */
for (i = 0; i < 3; i++)
encode_s->band[band].sg[i] = encode_s->band[band].p[i] >> 15;
wd1 = saturate (encode_s->band[band].a[1] << 2);
wd2 = (encode_s->band[band].sg[0] == encode_s->band[band].sg[1]) ? -wd1 : wd1;
if (wd2 > 32767)
wd2 = 32767;
wd3 = (wd2 >> 7) + ( (encode_s->band[band].sg[0] == encode_s->band[band].sg[2]) ? 128 : -128);
wd3 += (encode_s->band[band].a[2]*32512) >> 15;
if (wd3 > 12288)
wd3 = 12288;
else if (wd3 < -12288)
wd3 = -12288;
encode_s->band[band].ap[2] = wd3;
/* Block 4, UPPOL1 */
encode_s->band[band].sg[0] = encode_s->band[band].p[0] >> 15;
encode_s->band[band].sg[1] = encode_s->band[band].p[1] >> 15;
wd1 = (encode_s->band[band].sg[0] == encode_s->band[band].sg[1]) ? 192 : -192;
wd2 = (encode_s->band[band].a[1]*32640) >> 15;
encode_s->band[band].ap[1] = saturate (wd1 + wd2);
wd3 = saturate (15360 - encode_s->band[band].ap[2]);
if (encode_s->band[band].ap[1] > wd3)
encode_s->band[band].ap[1] = wd3;
else if (encode_s->band[band].ap[1] < -wd3)
encode_s->band[band].ap[1] = -wd3;
/* Block 4, UPZERO */
wd1 = (d == 0) ? 0 : 128;
encode_s->band[band].sg[0] = d >> 15;
for (i = 1; i < 7; i++) {
encode_s->band[band].sg[i] = encode_s->band[band].d[i] >> 15;
wd2 = (encode_s->band[band].sg[i] == encode_s->band[band].sg[0]) ? wd1 : -wd1;
wd3 = (encode_s->band[band].b[i]*32640) >> 15;
encode_s->band[band].bp[i] = saturate (wd2 + wd3);
}
/* Block 4, DELAYA */
for (i = 6; i > 0; i--) {
encode_s->band[band].d[i] = encode_s->band[band].d[i - 1];
encode_s->band[band].b[i] = encode_s->band[band].bp[i];
}
for (i = 2; i > 0; i--) {
encode_s->band[band].r[i] = encode_s->band[band].r[i - 1];
encode_s->band[band].p[i] = encode_s->band[band].p[i - 1];
encode_s->band[band].a[i] = encode_s->band[band].ap[i];
}
/* Block 4, FILTEP */
wd1 = saturate (encode_s->band[band].r[1] + encode_s->band[band].r[1]);
wd1 = (encode_s->band[band].a[1]*wd1) >> 15;
wd2 = saturate (encode_s->band[band].r[2] + encode_s->band[band].r[2]);
wd2 = (encode_s->band[band].a[2]*wd2) >> 15;
encode_s->band[band].sp = saturate (wd1 + wd2);
/* Block 4, FILTEZ */
encode_s->band[band].sz = 0;
for (i = 6; i > 0; i--) {
wd1 = saturate (encode_s->band[band].d[i] + encode_s->band[band].d[i]);
encode_s->band[band].sz += (encode_s->band[band].b[i]*wd1) >> 15;
}
encode_s->band[band].sz = saturate (encode_s->band[band].sz);
/* Block 4, PREDIC */
encode_s->band[band].s = saturate (encode_s->band[band].sp + encode_s->band[band].sz);
}
void block4_decode (int band, int d) {
int wd1 = 0;
int wd2 = 0;
int wd3 = 0;
int i = 0;
/* Block 4, RECONS */
decode_s->band[band].d[0] = d;
decode_s->band[band].r[0] = saturate (decode_s->band[band].s + d);
/* Block 4, PARREC */
decode_s->band[band].p[0] = saturate (decode_s->band[band].sz + d);
/* Block 4, UPPOL2 */
for (i = 0; i < 3; i++)
decode_s->band[band].sg[i] = decode_s->band[band].p[i] >> 15;
wd1 = saturate (decode_s->band[band].a[1] << 2);
wd2 = (decode_s->band[band].sg[0] == decode_s->band[band].sg[1]) ? -wd1 : wd1;
if (wd2 > 32767)
wd2 = 32767;
wd3 = (decode_s->band[band].sg[0] == decode_s->band[band].sg[2]) ? 128 : -128;
wd3 += (wd2 >> 7);
wd3 += (decode_s->band[band].a[2]*32512) >> 15;
if (wd3 > 12288)
wd3 = 12288;
else if (wd3 < -12288)
wd3 = -12288;
decode_s->band[band].ap[2] = wd3;
/* Block 4, UPPOL1 */
decode_s->band[band].sg[0] = decode_s->band[band].p[0] >> 15;
decode_s->band[band].sg[1] = decode_s->band[band].p[1] >> 15;
wd1 = (decode_s->band[band].sg[0] == decode_s->band[band].sg[1]) ? 192 : -192;
wd2 = (decode_s->band[band].a[1]*32640) >> 15;
decode_s->band[band].ap[1] = saturate (wd1 + wd2);
wd3 = saturate (15360 - decode_s->band[band].ap[2]);
if (decode_s->band[band].ap[1] > wd3)
decode_s->band[band].ap[1] = wd3;
else if (decode_s->band[band].ap[1] < -wd3)
decode_s->band[band].ap[1] = -wd3;
/* Block 4, UPZERO */
wd1 = (d == 0) ? 0 : 128;
decode_s->band[band].sg[0] = d >> 15;
for (i = 1; i < 7; i++) {
decode_s->band[band].sg[i] = decode_s->band[band].d[i] >> 15;
wd2 = (decode_s->band[band].sg[i] == decode_s->band[band].sg[0]) ? wd1 : -wd1;
wd3 = (decode_s->band[band].b[i]*32640) >> 15;
decode_s->band[band].bp[i] = saturate (wd2 + wd3);
}
/* Block 4, DELAYA */
for (i = 6; i > 0; i--) {
decode_s->band[band].d[i] = decode_s->band[band].d[i - 1];
decode_s->band[band].b[i] = decode_s->band[band].bp[i];
}
for (i = 2; i > 0; i--) {
decode_s->band[band].r[i] = decode_s->band[band].r[i - 1];
decode_s->band[band].p[i] = decode_s->band[band].p[i - 1];
decode_s->band[band].a[i] = decode_s->band[band].ap[i];
}
/* Block 4, FILTEP */
wd1 = saturate (decode_s->band[band].r[1] + decode_s->band[band].r[1]);
wd1 = (decode_s->band[band].a[1]*wd1) >> 15;
wd2 = saturate (decode_s->band[band].r[2] + decode_s->band[band].r[2]);
wd2 = (decode_s->band[band].a[2]*wd2) >> 15;
decode_s->band[band].sp = saturate (wd1 + wd2);
/* Block 4, FILTEZ */
decode_s->band[band].sz = 0;
for (i = 6; i > 0; i--) {
wd1 = saturate (decode_s->band[band].d[i] + decode_s->band[band].d[i]);
decode_s->band[band].sz += (decode_s->band[band].b[i]*wd1) >> 15;
}
decode_s->band[band].sz = saturate (decode_s->band[band].sz);
/* Block 4, PREDIC */
decode_s->band[band].s = saturate (decode_s->band[band].sp + decode_s->band[band].sz);
}
int g722_encode_release() {
delete decode_s;
decode_s = NULL;
return 0;
}
int g722_decode_release() {
delete encode_s;
encode_s = NULL;
return 0;
}
int g722_decode (int16_t amp[], const uint8_t 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 = 0;
int rlow = 0;
int ihigh = 0;
int dhigh = 0;
int rhigh = 0;
int xout1 = 0;
int xout2 = 0;
int wd1 = 0;
int wd2 = 0;
int wd3 = 0;
int code = 0;
int outlen = 0;
int i = 0;
int j = 0;
outlen = 0;
rhigh = 0;
for (j = 0; j < len;) {
if (decode_s->packed) {
/* Unpack the code bits */
if (decode_s->in_bits < decode_s->bits_per_sample) {
decode_s->in_buffer |= (g722_data[j++] << decode_s->in_bits);
decode_s->in_bits += 8;
}
code = decode_s->in_buffer & ( (1 << decode_s->bits_per_sample) - 1);
decode_s->in_buffer >>= decode_s->bits_per_sample;
decode_s->in_bits -= decode_s->bits_per_sample;
} else {
code = g722_data[j++];
}
switch (decode_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 = (decode_s->band[0].det*wd2) >> 15;
/* Block 5L, RECONS */
rlow = decode_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 = (decode_s->band[0].det*wd2) >> 15;
/* Block 3L, LOGSCL */
wd2 = rl42[wd1];
wd1 = (decode_s->band[0].nb*127) >> 7;
wd1 += wl[wd2];
if (wd1 < 0)
wd1 = 0;
else if (wd1 > 18432)
wd1 = 18432;
decode_s->band[0].nb = wd1;
/* Block 3L, SCALEL */
wd1 = (decode_s->band[0].nb >> 6) & 31;
wd2 = 8 - (decode_s->band[0].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
decode_s->band[0].det = wd3 << 2;
block4_decode (0, dlowt);
if (!decode_s->eight_k) {
/* Block 2H, INVQAH */
wd2 = qm2[ihigh];
dhigh = (decode_s->band[1].det*wd2) >> 15;
/* Block 5H, RECONS */
rhigh = dhigh + decode_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 = (decode_s->band[1].nb*127) >> 7;
wd1 += wh[wd2];
if (wd1 < 0)
wd1 = 0;
else if (wd1 > 22528)
wd1 = 22528;
decode_s->band[1].nb = wd1;
/* Block 3H, SCALEH */
wd1 = (decode_s->band[1].nb >> 6) & 31;
wd2 = 10 - (decode_s->band[1].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
decode_s->band[1].det = wd3 << 2;
block4_decode (1, dhigh);
}
if (decode_s->itu_test_mode) {
amp[outlen++] = (int16_t) (rlow << 1);
amp[outlen++] = (int16_t) (rhigh << 1);
} else {
if (decode_s->eight_k) {
amp[outlen++] = (int16_t) rlow;
} else {
/* Apply the receive QMF */
for (i = 0; i < 22; i++)
decode_s->x[i] = decode_s->x[i + 2];
decode_s->x[22] = rlow + rhigh;
decode_s->x[23] = rlow - rhigh;
xout1 = 0;
xout2 = 0;
for (i = 0; i < 12; i++) {
xout2 += decode_s->x[2*i]*qmf_coeffs[i];
xout1 += decode_s->x[2*i + 1]*qmf_coeffs[11 - i];
}
amp[outlen++] = (int16_t) (xout1 >> 12);
amp[outlen++] = (int16_t) (xout2 >> 12);
}
}
}
return outlen;
}
int g722_encode (uint8_t g722_data[], const int16_t amp[], int len) {
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 = 0;
int dhigh = 0;
int el = 0;
int wd = 0;
int wd1 = 0;
int ril = 0;
int wd2 = 0;
int il4 = 0;
int ih2 = 0;
int wd3 = 0;
int eh = 0;
int mih = 0;
int i = 0;
int j = 0;
/* Low and high band PCM from the QMF */
int xlow = 0;
int xhigh = 0;
int g722_bytes = 0;
/* Even and odd tap accumulators */
int sumeven = 0;
int sumodd = 0;
int ihigh = 0;
int ilow = 0;
int code = 9;
g722_bytes = 0;
xhigh = 0;
for (j = 0; j < len;) {
if (encode_s->itu_test_mode) {
xlow =
xhigh = amp[j++] >> 1;
} else {
if (encode_s->eight_k) {
xlow = amp[j++];
} else {
/* Apply the transmit QMF */
/* Shuffle the buffer down */ for (i = 0; i < 22; i++)
encode_s->x[i] = encode_s->x[i + 2];
encode_s->x[22] = amp[j++];
encode_s->x[23] = amp[j++];
/* Discard every other QMF output */
sumeven = 0;
sumodd = 0;
for (i = 0; i < 12; i++) {
sumodd += encode_s->x[2*i]*qmf_coeffs[i];
sumeven += encode_s->x[2*i + 1]*qmf_coeffs[11 - i];
}
xlow = (sumeven + sumodd) >> 13;
xhigh = (sumeven - sumodd) >> 13;
}
}
/* Block 1L, SUBTRA */
el = saturate (xlow - encode_s->band[0].s);
/* Block 1L, QUANTL */
wd = (el >= 0) ? el : - (el + 1);
for (i = 1; i < 30; i++) {
wd1 = (q6[i]*encode_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 = (encode_s->band[0].det*wd2) >> 15;
/* Block 3L, LOGSCL */
il4 = rl42[ril];
wd = (encode_s->band[0].nb*127) >> 7;
encode_s->band[0].nb = wd + wl[il4];
if (encode_s->band[0].nb < 0)
encode_s->band[0].nb = 0;
else if (encode_s->band[0].nb > 18432)
encode_s->band[0].nb = 18432;
/* Block 3L, SCALEL */
wd1 = (encode_s->band[0].nb >> 6) & 31;
wd2 = 8 - (encode_s->band[0].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
encode_s->band[0].det = wd3 << 2;
block4_encode (0, dlow);
if (encode_s->eight_k) {
/* Just leave the high bits as zero */
code = (0xC0 | ilow) >> (8 - encode_s->bits_per_sample);
} else {
/* Block 1H, SUBTRA */
eh = saturate (xhigh - encode_s->band[1].s);
/* Block 1H, QUANTH */
wd = (eh >= 0) ? eh : - (eh + 1);
wd1 = (564*encode_s->band[1].det) >> 12;
mih = (wd >= wd1) ? 2 : 1;
ihigh = (eh < 0) ? ihn[mih] : ihp[mih];
/* Block 2H, INVQAH */
wd2 = qm2[ihigh];
dhigh = (encode_s->band[1].det*wd2) >> 15;
/* Block 3H, LOGSCH */
ih2 = rh2[ihigh];
wd = (encode_s->band[1].nb*127) >> 7;
encode_s->band[1].nb = wd + wh[ih2];
if (encode_s->band[1].nb < 0)
encode_s->band[1].nb = 0;
else if (encode_s->band[1].nb > 22528)
encode_s->band[1].nb = 22528;
/* Block 3H, SCALEH */
wd1 = (encode_s->band[1].nb >> 6) & 31;
wd2 = 10 - (encode_s->band[1].nb >> 11);
wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
encode_s->band[1].det = wd3 << 2;
block4_encode (1, dhigh);
code = ( (ihigh << 6) | ilow) >> (8 - encode_s->bits_per_sample);
}
if (encode_s->packed) {
/* Pack the code bits */
encode_s->out_buffer |= (code << encode_s->out_bits);
encode_s->out_bits += encode_s->bits_per_sample;
if (encode_s->out_bits >= 8) {
g722_data[g722_bytes++] = (uint8_t) (encode_s->out_buffer & 0xFF);
encode_s->out_bits -= 8;
encode_s->out_buffer >>= 8;
}
} else {
g722_data[g722_bytes++] = (uint8_t) code;
}
}
return g722_bytes;
}
private:
g722_decode_state_t *decode_s;
g722_encode_state_t *encode_s;
};
// the class factories
extern "C" AudioCodec* create()
{
return new G722 (9);
}
extern "C" void destroy (AudioCodec* a)
{
delete a;}