401 lines
11 KiB
C
401 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_encode.c - The ITU G.722 codec, encode 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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* All rights reserved.
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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 on a single channel 64kbps only 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_encode_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 = (wd2 >> 7) + ((s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128);
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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_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 *) 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_encode_release(g722_encode_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_encode(g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len)
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{
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static const int q6[32] =
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{
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0, 35, 72, 110, 150, 190, 233, 276,
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323, 370, 422, 473, 530, 587, 650, 714,
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786, 858, 940, 1023, 1121, 1219, 1339, 1458,
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1612, 1765, 1980, 2195, 2557, 2919, 0, 0
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};
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static const int 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 int 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 int 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 int rl42[16] =
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{
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0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0
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};
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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 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 qm2[4] =
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{
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-7408, -1616, 7408, 1616
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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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static const int ihn[3] = {0, 1, 0};
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static const int ihp[3] = {0, 3, 2};
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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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int dlow;
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int 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 mih;
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int i;
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int j;
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/* Low and high band PCM from the QMF */
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int xlow;
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int xhigh;
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int g722_bytes;
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/* Even and odd tap accumulators */
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int sumeven;
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int sumodd;
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int ihigh;
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int ilow;
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int code;
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g722_bytes = 0;
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xhigh = 0;
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for (j = 0; j < len; )
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{
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if (s->itu_test_mode)
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{
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xlow =
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xhigh = amp[j++] >> 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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xlow = amp[j++] >> 1;
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}
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else
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{
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/* Apply the transmit QMF */
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/* Shuffle the buffer down */
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for (i = 0; i < 22; i++)
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s->x[i] = s->x[i + 2];
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s->x[22] = amp[j++];
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s->x[23] = amp[j++];
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/* Discard every other QMF output */
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sumeven = 0;
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sumodd = 0;
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for (i = 0; i < 12; i++)
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{
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sumodd += s->x[2*i]*qmf_coeffs[i];
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sumeven += s->x[2*i + 1]*qmf_coeffs[11 - i];
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}
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xlow = (sumeven + sumodd) >> 14;
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xhigh = (sumeven - sumodd) >> 14;
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}
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}
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/* Block 1L, SUBTRA */
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el = saturate(xlow - s->band[0].s);
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/* Block 1L, QUANTL */
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wd = (el >= 0) ? el : -(el + 1);
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for (i = 1; i < 30; i++)
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{
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wd1 = (q6[i]*s->band[0].det) >> 12;
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if (wd < wd1)
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break;
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}
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ilow = (el < 0) ? iln[i] : ilp[i];
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/* Block 2L, INVQAL */
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ril = ilow >> 2;
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wd2 = qm4[ril];
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dlow = (s->band[0].det*wd2) >> 15;
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/* Block 3L, LOGSCL */
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il4 = rl42[ril];
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wd = (s->band[0].nb*127) >> 7;
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s->band[0].nb = wd + wl[il4];
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if (s->band[0].nb < 0)
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s->band[0].nb = 0;
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else if (s->band[0].nb > 18432)
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s->band[0].nb = 18432;
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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, dlow);
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if (s->eight_k)
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{
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/* Just leave the high bits as zero */
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code = (0xC0 | ilow) >> (8 - s->bits_per_sample);
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}
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else
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{
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/* Block 1H, SUBTRA */
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eh = saturate(xhigh - s->band[1].s);
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/* Block 1H, QUANTH */
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wd = (eh >= 0) ? eh : -(eh + 1);
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wd1 = (564*s->band[1].det) >> 12;
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mih = (wd >= wd1) ? 2 : 1;
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ihigh = (eh < 0) ? ihn[mih] : ihp[mih];
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/* Block 2H, INVQAH */
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|
wd2 = qm2[ihigh];
|
||
|
|
dhigh = (s->band[1].det*wd2) >> 15;
|
||
|
|
|
||
|
|
/* Block 3H, LOGSCH */
|
||
|
|
ih2 = rh2[ihigh];
|
||
|
|
wd = (s->band[1].nb*127) >> 7;
|
||
|
|
s->band[1].nb = 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 = wd3 << 2;
|
||
|
|
|
||
|
|
block4(s, 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 ------------------------------------------------------------*/
|