399 lines
11 KiB
C
399 lines
11 KiB
C
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/*
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* SpanDSP - a series of DSP components for telephony
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*
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* g722_decode.c - The ITU G.722 codec, decode part.
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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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* Despite my general liking of the GPL, I place my own contributions
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* to this code in the public domain for the benefit of all mankind -
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* even the slimy ones who might try to proprietize my work and use it
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* to my detriment.
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*
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* Based in part on a single channel G.722 codec which is:
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*
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* Copyright (c) CMU 1993
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* Computer Science, Speech Group
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* Chengxiang Lu and Alex Hauptmann
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*
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* $Id$
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*/
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/*! \file */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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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 0
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#include <tgmath.h>
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#endif
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#include "g722.h"
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#if !defined(FALSE)
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#define FALSE 0
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#endif
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#if !defined(TRUE)
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#define TRUE (!FALSE)
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#endif
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static __inline__ int16_t saturate(int32_t amp)
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{
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int16_t amp16;
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/* Hopefully this is optimised for the common case - not clipping */
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amp16 = (int16_t) amp;
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if (amp == amp16)
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return amp16;
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if (amp > INT16_MAX)
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return INT16_MAX;
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return INT16_MIN;
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}
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/*- End of function --------------------------------------------------------*/
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static void block4(g722_decode_state_t *s, int band, int d);
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static void block4(g722_decode_state_t *s, int band, int d)
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{
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int wd1;
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int wd2;
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int wd3;
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int i;
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/* Block 4, RECONS */
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s->band[band].d[0] = d;
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s->band[band].r[0] = saturate(s->band[band].s + d);
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/* Block 4, PARREC */
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s->band[band].p[0] = saturate(s->band[band].sz + d);
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/* Block 4, UPPOL2 */
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for (i = 0; i < 3; i++)
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s->band[band].sg[i] = s->band[band].p[i] >> 15;
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wd1 = saturate(s->band[band].a[1] << 2);
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wd2 = (s->band[band].sg[0] == s->band[band].sg[1]) ? -wd1 : wd1;
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if (wd2 > 32767)
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wd2 = 32767;
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wd3 = (s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128;
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wd3 += (wd2 >> 7);
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wd3 += (s->band[band].a[2]*32512) >> 15;
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if (wd3 > 12288)
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wd3 = 12288;
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else if (wd3 < -12288)
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wd3 = -12288;
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s->band[band].ap[2] = wd3;
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/* Block 4, UPPOL1 */
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s->band[band].sg[0] = s->band[band].p[0] >> 15;
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s->band[band].sg[1] = s->band[band].p[1] >> 15;
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wd1 = (s->band[band].sg[0] == s->band[band].sg[1]) ? 192 : -192;
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wd2 = (s->band[band].a[1]*32640) >> 15;
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s->band[band].ap[1] = saturate(wd1 + wd2);
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wd3 = saturate(15360 - s->band[band].ap[2]);
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if (s->band[band].ap[1] > wd3)
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s->band[band].ap[1] = wd3;
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else if (s->band[band].ap[1] < -wd3)
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s->band[band].ap[1] = -wd3;
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/* Block 4, UPZERO */
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wd1 = (d == 0) ? 0 : 128;
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s->band[band].sg[0] = d >> 15;
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for (i = 1; i < 7; i++)
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{
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s->band[band].sg[i] = s->band[band].d[i] >> 15;
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wd2 = (s->band[band].sg[i] == s->band[band].sg[0]) ? wd1 : -wd1;
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wd3 = (s->band[band].b[i]*32640) >> 15;
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s->band[band].bp[i] = saturate(wd2 + wd3);
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}
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/* Block 4, DELAYA */
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for (i = 6; i > 0; i--)
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{
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s->band[band].d[i] = s->band[band].d[i - 1];
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s->band[band].b[i] = s->band[band].bp[i];
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}
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for (i = 2; i > 0; i--)
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{
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s->band[band].r[i] = s->band[band].r[i - 1];
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s->band[band].p[i] = s->band[band].p[i - 1];
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s->band[band].a[i] = s->band[band].ap[i];
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}
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/* Block 4, FILTEP */
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wd1 = saturate(s->band[band].r[1] + s->band[band].r[1]);
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wd1 = (s->band[band].a[1]*wd1) >> 15;
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wd2 = saturate(s->band[band].r[2] + s->band[band].r[2]);
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wd2 = (s->band[band].a[2]*wd2) >> 15;
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s->band[band].sp = saturate(wd1 + wd2);
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/* Block 4, FILTEZ */
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s->band[band].sz = 0;
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for (i = 6; i > 0; i--)
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{
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wd1 = saturate(s->band[band].d[i] + s->band[band].d[i]);
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s->band[band].sz += (s->band[band].b[i]*wd1) >> 15;
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}
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s->band[band].sz = saturate(s->band[band].sz);
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/* Block 4, PREDIC */
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s->band[band].s = saturate(s->band[band].sp + s->band[band].sz);
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}
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/*- End of function --------------------------------------------------------*/
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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 *) malloc(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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int g722_decode_release(g722_decode_state_t *s)
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{
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free(s);
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return 0;
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}
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/*- End of function --------------------------------------------------------*/
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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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static const int wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 };
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static const int rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 };
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static const int ilb[32] =
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{
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2048, 2093, 2139, 2186, 2233, 2282, 2332,
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2383, 2435, 2489, 2543, 2599, 2656, 2714,
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2774, 2834, 2896, 2960, 3025, 3091, 3158,
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3228, 3298, 3371, 3444, 3520, 3597, 3676,
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3756, 3838, 3922, 4008
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};
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static const int wh[3] = {0, -214, 798};
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static const int rh2[4] = {2, 1, 2, 1};
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static const int qm2[4] = {-7408, -1616, 7408, 1616};
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static const int 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 int 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 int 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 int qmf_coeffs[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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int dlowt;
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int rlow;
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int ihigh;
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int dhigh;
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int rhigh;
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int xout1;
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int xout2;
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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 i;
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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 = (s->band[0].det*wd2) >> 15;
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/* Block 5L, RECONS */
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rlow = s->band[0].s + wd2;
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/* Block 6L, LIMIT */
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if (rlow > 16383)
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rlow = 16383;
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else if (rlow < -16384)
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rlow = -16384;
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/* Block 2L, INVQAL */
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wd2 = qm4[wd1];
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dlowt = (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 = (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 = 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 = wd3 << 2;
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block4(s, 0, dlowt);
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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 = (s->band[1].det*wd2) >> 15;
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/* Block 5H, RECONS */
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rhigh = dhigh + s->band[1].s;
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/* Block 6H, LIMIT */
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if (rhigh > 16383)
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rhigh = 16383;
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else if (rhigh < -16384)
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rhigh = -16384;
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/* Block 2H, INVQAH */
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wd2 = rh2[ihigh];
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wd1 = (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;
|
||
|
|
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++] = (int16_t) (rlow << 1);
|
||
|
|
amp[outlen++] = (int16_t) (rhigh << 1);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (s->eight_k)
|
||
|
|
{
|
||
|
|
amp[outlen++] = (int16_t) (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];
|
||
|
|
}
|
||
|
|
amp[outlen++] = (int16_t) (xout1 >> 11);
|
||
|
|
amp[outlen++] = (int16_t) (xout2 >> 11);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return outlen;
|
||
|
|
}
|
||
|
|
/*- End of function --------------------------------------------------------*/
|
||
|
|
/*- End of file ------------------------------------------------------------*/
|