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387 lines
10 KiB
C
387 lines
10 KiB
C
/*
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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: g722_encode.c,v 1.14 2006/07/07 16:37:49 steveu Exp $
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*/
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/*! \file */
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#include <stdlib.h>
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#include <string.h>
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#include "g722_enc_dec.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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#define PACKED_OUTPUT (0)
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#define BITS_PER_SAMPLE (8)
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#ifndef BUILD_FEATURE_G722_USE_INTRINSIC_SAT
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static __inline int16_t saturate(int32_t amp) {
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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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}
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if (amp > 0x7FFF) {
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return 0x7FFF;
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}
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return 0x8000;
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}
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#else
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static __inline int16_t saturate(int32_t val) {
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register int32_t res;
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__asm volatile("SSAT %0, #16, %1\n\t" : "=r"(res) : "r"(val) :);
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return (int16_t)res;
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}
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#endif
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/*- End of function --------------------------------------------------------*/
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static void block4(g722_band_t *band, int d) {
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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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int sg[7];
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int ap1, ap2;
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int sg0, sgi;
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int sz;
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/* Block 4, RECONS */
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band->d[0] = d;
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band->r[0] = saturate(band->s + d);
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/* Block 4, PARREC */
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band->p[0] = saturate(band->sz + d);
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/* Block 4, UPPOL2 */
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for (i = 0; i < 3; i++) {
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sg[i] = band->p[i] >> 15;
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}
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wd1 = saturate(band->a[1] << 2);
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wd2 = (sg[0] == sg[1]) ? -wd1 : wd1;
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if (wd2 > 32767) {
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wd2 = 32767;
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}
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ap2 = (wd2 >> 7) + ((sg[0] == sg[2]) ? 128 : -128);
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ap2 += (band->a[2] * 32512) >> 15;
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if (ap2 > 12288) {
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ap2 = 12288;
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} else if (ap2 < -12288) {
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ap2 = -12288;
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}
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band->ap[2] = ap2;
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/* Block 4, UPPOL1 */
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sg[0] = band->p[0] >> 15;
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sg[1] = band->p[1] >> 15;
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wd1 = (sg[0] == sg[1]) ? 192 : -192;
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wd2 = (band->a[1] * 32640) >> 15;
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ap1 = saturate(wd1 + wd2);
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wd3 = saturate(15360 - band->ap[2]);
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if (ap1 > wd3) {
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ap1 = wd3;
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} else if (ap1 < -wd3) {
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ap1 = -wd3;
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}
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band->ap[1] = ap1;
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/* Block 4, UPZERO */
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/* Block 4, FILTEZ */
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wd1 = (d == 0) ? 0 : 128;
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sg0 = sg[0] = d >> 15;
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for (i = 1; i < 7; i++) {
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sgi = band->d[i] >> 15;
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wd2 = (sgi == sg0) ? wd1 : -wd1;
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wd3 = (band->b[i] * 32640) >> 15;
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band->bp[i] = saturate(wd2 + wd3);
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}
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/* Block 4, DELAYA */
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sz = 0;
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for (i = 6; i > 0; i--) {
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int bi;
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band->d[i] = band->d[i - 1];
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bi = band->b[i] = band->bp[i];
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wd1 = saturate(band->d[i] + band->d[i]);
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sz += (bi * wd1) >> 15;
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}
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band->sz = sz;
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for (i = 2; i > 0; i--) {
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band->r[i] = band->r[i - 1];
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band->p[i] = band->p[i - 1];
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band->a[i] = band->ap[i];
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}
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/* Block 4, FILTEP */
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wd1 = saturate(band->r[1] + band->r[1]);
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wd1 = (band->a[1] * wd1) >> 15;
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wd2 = saturate(band->r[2] + band->r[2]);
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wd2 = (band->a[2] * wd2) >> 15;
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band->sp = saturate(wd1 + wd2);
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/* Block 4, PREDIC */
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band->s = saturate(band->sp + 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, unsigned int rate, int options) {
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if (s == NULL) {
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#ifdef G722_SUPPORT_MALLOC
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if ((s = (g722_encode_state_t *)malloc(sizeof(*s))) == NULL)
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#endif
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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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}
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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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free(s);
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return 0;
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}
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/*- End of function --------------------------------------------------------*/
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/* WebRtc, tlegrand:
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* Only define the following if bit-exactness with reference implementation
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* is needed. Will only have any effect if input signal is saturated.
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*/
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// #define RUN_LIKE_REFERENCE_G722
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#ifdef RUN_LIKE_REFERENCE_G722
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int16_t limitValues(int16_t rl) {
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int16_t yl;
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yl = (rl > 16383) ? 16383 : ((rl < -16384) ? -16384 : rl);
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return yl;
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}
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/*- End of function --------------------------------------------------------*/
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#endif
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static int16_t q6[32] = {0, 35, 72, 110, 150, 190, 233, 276, 323, 370, 422,
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473, 530, 587, 650, 714, 786, 858, 940, 1023, 1121, 1219,
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1339, 1458, 1612, 1765, 1980, 2195, 2557, 2919, 0, 0};
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static int16_t iln[32] = {0, 63, 62, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19,
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18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 0};
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static int16_t ilp[32] = {0, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47,
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46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 0};
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static int16_t wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042};
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static int16_t rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0};
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static int16_t ilb[32] = {2048, 2093, 2139, 2186, 2233, 2282, 2332, 2383, 2435, 2489, 2543,
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2599, 2656, 2714, 2774, 2834, 2896, 2960, 3025, 3091, 3158, 3228,
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3298, 3371, 3444, 3520, 3597, 3676, 3756, 3838, 3922, 4008};
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static int16_t qm4[16] = {0, -20456, -12896, -8968, -6288, -4240, -2584, -1200,
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20456, 12896, 8968, 6288, 4240, 2584, 1200, 0};
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static int16_t qm2[4] = {-7408, -1616, 7408, 1616};
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static int16_t qmf_coeffs[12] = {
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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 int16_t ihn[3] = {0, 1, 0};
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static int16_t ihp[3] = {0, 3, 2};
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static int16_t wh[3] = {0, -214, 798};
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static int16_t rh2[4] = {2, 1, 2, 1};
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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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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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if (s->itu_test_mode) {
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xlow = xhigh = amp[j++] >> 1;
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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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}
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// TODO: if len is odd, then this can be a buffer overrun
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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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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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/* We shift by 12 to allow for the QMF filters (DC gain = 4096), plus 1
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to allow for us summing two filters, plus 1 to allow for the 15 bit
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input to the G.722 algorithm. */
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xlow = (sumeven + sumodd) >> 14;
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xhigh = (sumeven - sumodd) >> 14;
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#ifdef RUN_LIKE_REFERENCE_G722
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/* The following lines are only used to verify bit-exactness
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* with reference implementation of G.722. Higher precision
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* is achieved without limiting the values.
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*/
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xlow = limitValues(xlow);
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xhigh = limitValues(xhigh);
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#endif
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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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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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}
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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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}
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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->band[0], dlow);
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{
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int nb;
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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];
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dhigh = (s->band[1].det * wd2) >> 15;
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/* Block 3H, LOGSCH */
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ih2 = rh2[ihigh];
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wd = (s->band[1].nb * 127) >> 7;
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nb = wd + wh[ih2];
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if (nb < 0) {
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nb = 0;
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} else if (nb > 22528) {
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nb = 22528;
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}
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s->band[1].nb = nb;
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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 = wd3 << 2;
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block4(&s->band[1], dhigh);
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#if BITS_PER_SAMPLE == 8
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code = ((ihigh << 6) | ilow);
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#elif BITS_PER_SAMPLE == 7
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code = ((ihigh << 6) | ilow) >> 1;
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#elif BITS_PER_SAMPLE == 6
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code = ((ihigh << 6) | ilow) >> 2;
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#endif
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}
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#if PACKED_OUTPUT == 1
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/* Pack the code bits */
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s->out_buffer |= (code << s->out_bits);
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s->out_bits += s->bits_per_sample;
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if (s->out_bits >= 8) {
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g722_data[g722_bytes++] = (uint8_t)(s->out_buffer & 0xFF);
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s->out_bits -= 8;
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s->out_buffer >>= 8;
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}
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#else
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g722_data[g722_bytes++] = (uint8_t)code;
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#endif
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}
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return g722_bytes;
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}
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/*- End of function --------------------------------------------------------*/
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/*- End of file ------------------------------------------------------------*/
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