forked from Mirrors/freeswitch
630 lines
17 KiB
C
630 lines
17 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* g722.c - The ITU G.722 codec.
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2005 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*! \file */
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#if defined(HAVE_CONFIG_H)
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#include "config.h"
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#endif
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#include <inttypes.h>
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#include <memory.h>
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#include <stdlib.h>
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#if defined(HAVE_TGMATH_H)
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#include <tgmath.h>
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#endif
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#if defined(HAVE_MATH_H)
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#include <math.h>
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#endif
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#if defined(HAVE_STDBOOL_H)
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#include <stdbool.h>
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#else
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#include "spandsp/stdbool.h"
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#endif
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#include "floating_fudge.h"
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#include "spandsp/telephony.h"
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#include "spandsp/alloc.h"
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#include "spandsp/fast_convert.h"
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#include "spandsp/saturated.h"
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#include "spandsp/vector_int.h"
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#include "spandsp/g722.h"
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#include "spandsp/private/g722.h"
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static const int16_t qmf_coeffs_fwd[12] =
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{
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3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11,
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};
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static const int16_t qmf_coeffs_rev[12] =
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{
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-11, 53, -156, 362, -805, 3876, 951, -210, 32, 12, -11, 3
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};
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static const int16_t qm2[4] =
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{
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-7408, -1616, 7408, 1616
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};
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static const int16_t qm4[16] =
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{
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0, -20456, -12896, -8968,
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-6288, -4240, -2584, -1200,
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20456, 12896, 8968, 6288,
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4240, 2584, 1200, 0
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};
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static const int16_t qm5[32] =
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{
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-280, -280, -23352, -17560,
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-14120, -11664, -9752, -8184,
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-6864, -5712, -4696, -3784,
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-2960, -2208, -1520, -880,
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23352, 17560, 14120, 11664,
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9752, 8184, 6864, 5712,
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4696, 3784, 2960, 2208,
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1520, 880, 280, -280
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};
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static const int16_t qm6[64] =
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{
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-136, -136, -136, -136,
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-24808, -21904, -19008, -16704,
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-14984, -13512, -12280, -11192,
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-10232, -9360, -8576, -7856,
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-7192, -6576, -6000, -5456,
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-4944, -4464, -4008, -3576,
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-3168, -2776, -2400, -2032,
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-1688, -1360, -1040, -728,
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24808, 21904, 19008, 16704,
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14984, 13512, 12280, 11192,
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10232, 9360, 8576, 7856,
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7192, 6576, 6000, 5456,
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4944, 4464, 4008, 3576,
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3168, 2776, 2400, 2032,
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1688, 1360, 1040, 728,
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432, 136, -432, -136
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};
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static const int16_t q6[32] =
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{
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0, 35, 72, 110,
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150, 190, 233, 276,
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323, 370, 422, 473,
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530, 587, 650, 714,
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786, 858, 940, 1023,
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1121, 1219, 1339, 1458,
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1612, 1765, 1980, 2195,
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2557, 2919, 0, 0
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};
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static const int16_t ilb[32] =
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{
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2048, 2093, 2139, 2186,
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2233, 2282, 2332, 2383,
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2435, 2489, 2543, 2599,
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2656, 2714, 2774, 2834,
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2896, 2960, 3025, 3091,
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3158, 3228, 3298, 3371,
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3444, 3520, 3597, 3676,
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3756, 3838, 3922, 4008
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};
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static const int16_t iln[32] =
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{
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0, 63, 62, 31, 30, 29, 28, 27,
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26, 25, 24, 23, 22, 21, 20, 19,
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18, 17, 16, 15, 14, 13, 12, 11,
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10, 9, 8, 7, 6, 5, 4, 0
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};
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static const int16_t ilp[32] =
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{
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0, 61, 60, 59, 58, 57, 56, 55,
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54, 53, 52, 51, 50, 49, 48, 47,
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46, 45, 44, 43, 42, 41, 40, 39,
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38, 37, 36, 35, 34, 33, 32, 0
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};
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static const int16_t ihn[3] =
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{
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0, 1, 0
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};
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static const int16_t ihp[3] =
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{
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0, 3, 2
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};
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static const int16_t wl[8] =
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{
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-60, -30, 58, 172, 334, 538, 1198, 3042
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};
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static const int16_t rl42[16] =
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{
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0, 7, 6, 5, 4, 3, 2, 1,
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7, 6, 5, 4, 3, 2, 1, 0
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};
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static const int16_t wh[3] =
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{
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0, -214, 798
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};
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static const int16_t rh2[4] =
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{
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2, 1, 2, 1
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};
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static void block4(g722_band_t *s, int16_t dx)
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{
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int16_t wd1;
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int16_t wd2;
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int16_t wd3;
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int16_t sp;
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int16_t r;
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int16_t p;
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int16_t ap[2];
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int32_t wd32;
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int32_t sz;
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int i;
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/* RECONS */
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r = sat_add16(s->s, dx);
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/* PARREC */
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p = sat_add16(s->sz, dx);
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/* UPPOL2 */
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wd1 = saturate16((int32_t) s->a[0] << 2);
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wd32 = ((p ^ s->p[0]) & 0x8000) ? wd1 : -wd1;
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if (wd32 > 32767)
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wd32 = 32767;
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wd3 = (int16_t) ((((p ^ s->p[1]) & 0x8000) ? -128 : 128)
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+ (wd32 >> 7)
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+ (((int32_t) s->a[1]*32512) >> 15));
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if (abs(wd3) > 12288)
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wd3 = (wd3 < 0) ? -12288 : 12288;
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ap[1] = wd3;
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/* UPPOL1 */
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wd1 = ((p ^ s->p[0]) & 0x8000) ? -192 : 192;
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wd2 = (int16_t) (((int32_t) s->a[0]*32640) >> 15);
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ap[0] = sat_add16(wd1, wd2);
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wd3 = sat_sub16(15360, ap[1]);
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if (abs(ap[0]) > wd3)
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ap[0] = (ap[0] < 0) ? -wd3 : wd3;
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/* FILTEP */
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wd1 = sat_add16(r, r);
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wd1 = (int16_t) (((int32_t) ap[0]*wd1) >> 15);
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wd2 = sat_add16(s->r, s->r);
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wd2 = (int16_t) (((int32_t) ap[1]*wd2) >> 15);
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sp = sat_add16(wd1, wd2);
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s->r = r;
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s->a[1] = ap[1];
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s->a[0] = ap[0];
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s->p[1] = s->p[0];
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s->p[0] = p;
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/* UPZERO */
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/* DELAYA */
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/* FILTEZ */
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wd1 = (dx == 0) ? 0 : 128;
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s->d[0] = dx;
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sz = 0;
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for (i = 5; i >= 0; i--)
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{
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wd2 = ((s->d[i + 1] ^ dx) & 0x8000) ? -wd1 : wd1;
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wd3 = (int16_t) (((int32_t) s->b[i]*32640) >> 15);
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s->b[i] = sat_add16(wd2, wd3);
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wd3 = sat_add16(s->d[i], s->d[i]);
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sz += ((int32_t) s->b[i]*wd3) >> 15;
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s->d[i + 1] = s->d[i];
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}
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s->sz = saturate16(sz);
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/* PREDIC */
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s->s = sat_add16(sp, s->sz);
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}
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/*- End of function --------------------------------------------------------*/
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SPAN_DECLARE(g722_decode_state_t *) g722_decode_init(g722_decode_state_t *s, int rate, int options)
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{
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if (s == NULL)
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{
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if ((s = (g722_decode_state_t *) span_alloc(sizeof(*s))) == NULL)
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return NULL;
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}
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memset(s, 0, sizeof(*s));
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if (rate == 48000)
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s->bits_per_sample = 6;
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else if (rate == 56000)
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s->bits_per_sample = 7;
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else
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s->bits_per_sample = 8;
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if ((options & G722_SAMPLE_RATE_8000))
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s->eight_k = true;
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if ((options & G722_PACKED) && s->bits_per_sample != 8)
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s->packed = true;
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else
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s->packed = false;
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s->band[0].det = 32;
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s->band[1].det = 8;
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return s;
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}
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/*- End of function --------------------------------------------------------*/
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SPAN_DECLARE(int) g722_decode_release(g722_decode_state_t *s)
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{
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return 0;
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}
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/*- End of function --------------------------------------------------------*/
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SPAN_DECLARE(int) g722_decode_free(g722_decode_state_t *s)
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{
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span_free(s);
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return 0;
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}
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/*- End of function --------------------------------------------------------*/
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SPAN_DECLARE(int) g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len)
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{
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int rlow;
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int ihigh;
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int16_t dlow;
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int16_t dhigh;
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int rhigh;
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int wd1;
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int wd2;
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int wd3;
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int code;
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int outlen;
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int j;
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outlen = 0;
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rhigh = 0;
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for (j = 0; j < len; )
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{
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if (s->packed)
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{
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/* Unpack the code bits */
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if (s->in_bits < s->bits_per_sample)
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{
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s->in_buffer |= (g722_data[j++] << s->in_bits);
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s->in_bits += 8;
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}
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code = s->in_buffer & ((1 << s->bits_per_sample) - 1);
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s->in_buffer >>= s->bits_per_sample;
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s->in_bits -= s->bits_per_sample;
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}
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else
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{
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code = g722_data[j++];
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}
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switch (s->bits_per_sample)
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{
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default:
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case 8:
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wd1 = code & 0x3F;
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ihigh = (code >> 6) & 0x03;
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wd2 = qm6[wd1];
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wd1 >>= 2;
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break;
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case 7:
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wd1 = code & 0x1F;
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ihigh = (code >> 5) & 0x03;
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wd2 = qm5[wd1];
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wd1 >>= 1;
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break;
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case 6:
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wd1 = code & 0x0F;
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ihigh = (code >> 4) & 0x03;
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wd2 = qm4[wd1];
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break;
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}
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/* Block 5L, LOW BAND INVQBL */
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wd2 = ((int32_t) s->band[0].det*wd2) >> 15;
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/* Block 5L, RECONS */
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/* Block 6L, LIMIT */
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rlow = saturate15(s->band[0].s + wd2);
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/* Block 2L, INVQAL */
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wd2 = qm4[wd1];
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dlow = (int16_t) (((int32_t) s->band[0].det*wd2) >> 15);
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/* Block 3L, LOGSCL */
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wd2 = rl42[wd1];
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wd1 = ((int32_t) s->band[0].nb*127) >> 7;
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wd1 += wl[wd2];
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if (wd1 < 0)
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wd1 = 0;
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else if (wd1 > 18432)
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wd1 = 18432;
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s->band[0].nb = (int16_t) wd1;
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/* Block 3L, SCALEL */
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wd1 = (s->band[0].nb >> 6) & 31;
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wd2 = 8 - (s->band[0].nb >> 11);
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wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
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s->band[0].det = (int16_t) (wd3 << 2);
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block4(&s->band[0], dlow);
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if (!s->eight_k)
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{
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/* Block 2H, INVQAH */
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wd2 = qm2[ihigh];
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dhigh = (int16_t) (((int32_t) s->band[1].det*wd2) >> 15);
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/* Block 5H, RECONS */
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/* Block 6H, LIMIT */
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rhigh = saturate15(dhigh + s->band[1].s);
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/* Block 2H, INVQAH */
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wd2 = rh2[ihigh];
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wd1 = ((int32_t) s->band[1].nb*127) >> 7;
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wd1 += wh[wd2];
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if (wd1 < 0)
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wd1 = 0;
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else if (wd1 > 22528)
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wd1 = 22528;
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s->band[1].nb = (int16_t) wd1;
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/* Block 3H, SCALEH */
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wd1 = (s->band[1].nb >> 6) & 31;
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wd2 = 10 - (s->band[1].nb >> 11);
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wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
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s->band[1].det = (int16_t) (wd3 << 2);
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block4(&s->band[1], dhigh);
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}
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if (s->itu_test_mode)
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{
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amp[outlen++] = (int16_t) (rlow << 1);
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amp[outlen++] = (int16_t) (rhigh << 1);
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}
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else
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{
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if (s->eight_k)
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{
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/* We shift by 1 to allow for the 15 bit input to the G.722 algorithm. */
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amp[outlen++] = (int16_t) (rlow << 1);
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}
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else
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{
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/* Apply the QMF to build the final signal */
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s->x[s->ptr] = (int16_t) (rlow + rhigh);
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s->y[s->ptr] = (int16_t) (rlow - rhigh);
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if (++s->ptr >= 12)
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s->ptr = 0;
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/* We shift by 12 to allow for the QMF filters (DC gain = 4096), less 1
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to allow for the 15 bit input to the G.722 algorithm. */
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amp[outlen++] = (int16_t) (vec_circular_dot_prodi16(s->y, qmf_coeffs_rev, 12, s->ptr) >> 11);
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amp[outlen++] = (int16_t) (vec_circular_dot_prodi16(s->x, qmf_coeffs_fwd, 12, s->ptr) >> 11);
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}
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}
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}
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return outlen;
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}
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/*- End of function --------------------------------------------------------*/
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SPAN_DECLARE(g722_encode_state_t *) g722_encode_init(g722_encode_state_t *s, int rate, int options)
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{
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if (s == NULL)
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{
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if ((s = (g722_encode_state_t *) span_alloc(sizeof(*s))) == NULL)
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return NULL;
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}
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memset(s, 0, sizeof(*s));
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if (rate == 48000)
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s->bits_per_sample = 6;
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else if (rate == 56000)
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s->bits_per_sample = 7;
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else
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s->bits_per_sample = 8;
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if ((options & G722_SAMPLE_RATE_8000))
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s->eight_k = true;
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if ((options & G722_PACKED) && s->bits_per_sample != 8)
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s->packed = true;
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else
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s->packed = false;
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s->band[0].det = 32;
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s->band[1].det = 8;
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return s;
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}
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/*- End of function --------------------------------------------------------*/
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SPAN_DECLARE(int) g722_encode_release(g722_encode_state_t *s)
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{
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return 0;
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}
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/*- End of function --------------------------------------------------------*/
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SPAN_DECLARE(int) g722_encode_free(g722_encode_state_t *s)
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{
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span_free(s);
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return 0;
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}
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/*- End of function --------------------------------------------------------*/
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SPAN_DECLARE(int) g722_encode(g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len)
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{
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int16_t dlow;
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int16_t dhigh;
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int el;
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int wd;
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int wd1;
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int ril;
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int wd2;
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int il4;
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int ih2;
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int wd3;
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int eh;
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int g722_bytes;
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int ihigh;
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int ilow;
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int code;
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/* Low and high band PCM from the QMF */
|
|
int16_t xlow;
|
|
int16_t xhigh;
|
|
int32_t sumeven;
|
|
int32_t sumodd;
|
|
int mih;
|
|
int i;
|
|
int j;
|
|
|
|
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)
|
|
{
|
|
/* We shift by 1 to allow for the 15 bit input to the G.722 algorithm. */
|
|
xlow = amp[j++] >> 1;
|
|
}
|
|
else
|
|
{
|
|
/* Apply the transmit QMF */
|
|
s->x[s->ptr] = amp[j++];
|
|
s->y[s->ptr] = amp[j++];
|
|
if (++s->ptr >= 12)
|
|
s->ptr = 0;
|
|
sumodd = vec_circular_dot_prodi16(s->x, qmf_coeffs_fwd, 12, s->ptr);
|
|
sumeven = vec_circular_dot_prodi16(s->y, qmf_coeffs_rev, 12, s->ptr);
|
|
/* We shift by 12 to allow for the QMF filters (DC gain = 4096), plus 1
|
|
to allow for us summing two filters, plus 1 to allow for the 15 bit
|
|
input to the G.722 algorithm. */
|
|
xlow = (int16_t) ((sumeven + sumodd) >> 14);
|
|
xhigh = (int16_t) ((sumeven - sumodd) >> 14);
|
|
}
|
|
}
|
|
/* Block 1L, SUBTRA */
|
|
el = sat_sub16(xlow, s->band[0].s);
|
|
|
|
/* Block 1L, QUANTL */
|
|
wd = (el >= 0) ? el : ~el;
|
|
|
|
for (i = 1; i < 30; i++)
|
|
{
|
|
wd1 = ((int32_t) 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 = (int16_t) (((int32_t) s->band[0].det*wd2) >> 15);
|
|
|
|
/* Block 3L, LOGSCL */
|
|
il4 = rl42[ril];
|
|
wd = ((int32_t) s->band[0].nb*127) >> 7;
|
|
s->band[0].nb = (int16_t) (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 = (int16_t) (wd3 << 2);
|
|
|
|
block4(&s->band[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 = sat_sub16(xhigh, s->band[1].s);
|
|
|
|
/* Block 1H, QUANTH */
|
|
wd = (eh >= 0) ? eh : ~eh;
|
|
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 = (int16_t) (((int32_t) s->band[1].det*wd2) >> 15);
|
|
|
|
/* Block 3H, LOGSCH */
|
|
ih2 = rh2[ihigh];
|
|
wd = ((int32_t) s->band[1].nb*127) >> 7;
|
|
s->band[1].nb = (int16_t) (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 = (int16_t) (wd3 << 2);
|
|
|
|
block4(&s->band[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;
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
/*- End of file ------------------------------------------------------------*/
|