From ba716659248f262ac2b45d16db686117f18f72ec Mon Sep 17 00:00:00 2001 From: Matthew Fredrickson Date: Thu, 21 Dec 2006 00:08:21 +0000 Subject: Add codec G.722 support. git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48661 65c4cc65-6c06-0410-ace0-fbb531ad65f3 --- codecs/g722/g722_encode.c | 400 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 400 insertions(+) create mode 100644 codecs/g722/g722_encode.c (limited to 'codecs/g722/g722_encode.c') diff --git a/codecs/g722/g722_encode.c b/codecs/g722/g722_encode.c new file mode 100644 index 000000000..ad7e6b522 --- /dev/null +++ b/codecs/g722/g722_encode.c @@ -0,0 +1,400 @@ +/* + * SpanDSP - a series of DSP components for telephony + * + * g722_encode.c - The ITU G.722 codec, encode part. + * + * Written by Steve Underwood + * + * Copyright (C) 2005 Steve Underwood + * + * All rights reserved. + * + * Despite my general liking of the GPL, I place my own contributions + * to this code in the public domain for the benefit of all mankind - + * even the slimy ones who might try to proprietize my work and use it + * to my detriment. + * + * Based on a single channel 64kbps only G.722 codec which is: + * + ***** Copyright (c) CMU 1993 ***** + * Computer Science, Speech Group + * Chengxiang Lu and Alex Hauptmann + * + * $Id$ + */ + +/*! \file */ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include +#include +#include +#include +#if 0 +#include +#endif + +#include "g722.h" + +#if !defined(FALSE) +#define FALSE 0 +#endif +#if !defined(TRUE) +#define TRUE (!FALSE) +#endif + +static __inline__ int16_t saturate(int32_t amp) +{ + int16_t amp16; + + /* Hopefully this is optimised for the common case - not clipping */ + amp16 = (int16_t) amp; + if (amp == amp16) + return amp16; + if (amp > INT16_MAX) + return INT16_MAX; + return INT16_MIN; +} +/*- End of function --------------------------------------------------------*/ + +static void block4(g722_encode_state_t *s, int band, int d) +{ + int wd1; + int wd2; + int wd3; + int i; + + /* Block 4, RECONS */ + s->band[band].d[0] = d; + s->band[band].r[0] = saturate(s->band[band].s + d); + + /* Block 4, PARREC */ + s->band[band].p[0] = saturate(s->band[band].sz + d); + + /* Block 4, UPPOL2 */ + for (i = 0; i < 3; i++) + s->band[band].sg[i] = s->band[band].p[i] >> 15; + wd1 = saturate(s->band[band].a[1] << 2); + + wd2 = (s->band[band].sg[0] == s->band[band].sg[1]) ? -wd1 : wd1; + if (wd2 > 32767) + wd2 = 32767; + wd3 = (wd2 >> 7) + ((s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128); + wd3 += (s->band[band].a[2]*32512) >> 15; + if (wd3 > 12288) + wd3 = 12288; + else if (wd3 < -12288) + wd3 = -12288; + s->band[band].ap[2] = wd3; + + /* Block 4, UPPOL1 */ + s->band[band].sg[0] = s->band[band].p[0] >> 15; + s->band[band].sg[1] = s->band[band].p[1] >> 15; + wd1 = (s->band[band].sg[0] == s->band[band].sg[1]) ? 192 : -192; + wd2 = (s->band[band].a[1]*32640) >> 15; + + s->band[band].ap[1] = saturate(wd1 + wd2); + wd3 = saturate(15360 - s->band[band].ap[2]); + if (s->band[band].ap[1] > wd3) + s->band[band].ap[1] = wd3; + else if (s->band[band].ap[1] < -wd3) + s->band[band].ap[1] = -wd3; + + /* Block 4, UPZERO */ + wd1 = (d == 0) ? 0 : 128; + s->band[band].sg[0] = d >> 15; + for (i = 1; i < 7; i++) + { + s->band[band].sg[i] = s->band[band].d[i] >> 15; + wd2 = (s->band[band].sg[i] == s->band[band].sg[0]) ? wd1 : -wd1; + wd3 = (s->band[band].b[i]*32640) >> 15; + s->band[band].bp[i] = saturate(wd2 + wd3); + } + + /* Block 4, DELAYA */ + for (i = 6; i > 0; i--) + { + s->band[band].d[i] = s->band[band].d[i - 1]; + s->band[band].b[i] = s->band[band].bp[i]; + } + + for (i = 2; i > 0; i--) + { + s->band[band].r[i] = s->band[band].r[i - 1]; + s->band[band].p[i] = s->band[band].p[i - 1]; + s->band[band].a[i] = s->band[band].ap[i]; + } + + /* Block 4, FILTEP */ + wd1 = saturate(s->band[band].r[1] + s->band[band].r[1]); + wd1 = (s->band[band].a[1]*wd1) >> 15; + wd2 = saturate(s->band[band].r[2] + s->band[band].r[2]); + wd2 = (s->band[band].a[2]*wd2) >> 15; + s->band[band].sp = saturate(wd1 + wd2); + + /* Block 4, FILTEZ */ + s->band[band].sz = 0; + for (i = 6; i > 0; i--) + { + wd1 = saturate(s->band[band].d[i] + s->band[band].d[i]); + s->band[band].sz += (s->band[band].b[i]*wd1) >> 15; + } + s->band[band].sz = saturate(s->band[band].sz); + + /* Block 4, PREDIC */ + s->band[band].s = saturate(s->band[band].sp + s->band[band].sz); +} +/*- End of function --------------------------------------------------------*/ + +g722_encode_state_t *g722_encode_init(g722_encode_state_t *s, int rate, int options) +{ + if (s == NULL) + { + if ((s = (g722_encode_state_t *) malloc(sizeof(*s))) == NULL) + return NULL; + } + memset(s, 0, sizeof(*s)); + if (rate == 48000) + s->bits_per_sample = 6; + else if (rate == 56000) + s->bits_per_sample = 7; + else + s->bits_per_sample = 8; + if ((options & G722_SAMPLE_RATE_8000)) + s->eight_k = TRUE; + if ((options & G722_PACKED) && s->bits_per_sample != 8) + s->packed = TRUE; + else + s->packed = FALSE; + s->band[0].det = 32; + s->band[1].det = 8; + return s; +} +/*- End of function --------------------------------------------------------*/ + +int g722_encode_release(g722_encode_state_t *s) +{ + free(s); + return 0; +} +/*- End of function --------------------------------------------------------*/ + +int g722_encode(g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len) +{ + static const int q6[32] = + { + 0, 35, 72, 110, 150, 190, 233, 276, + 323, 370, 422, 473, 530, 587, 650, 714, + 786, 858, 940, 1023, 1121, 1219, 1339, 1458, + 1612, 1765, 1980, 2195, 2557, 2919, 0, 0 + }; + static const int iln[32] = + { + 0, 63, 62, 31, 30, 29, 28, 27, + 26, 25, 24, 23, 22, 21, 20, 19, + 18, 17, 16, 15, 14, 13, 12, 11, + 10, 9, 8, 7, 6, 5, 4, 0 + }; + static const int ilp[32] = + { + 0, 61, 60, 59, 58, 57, 56, 55, + 54, 53, 52, 51, 50, 49, 48, 47, + 46, 45, 44, 43, 42, 41, 40, 39, + 38, 37, 36, 35, 34, 33, 32, 0 + }; + static const int wl[8] = + { + -60, -30, 58, 172, 334, 538, 1198, 3042 + }; + static const int rl42[16] = + { + 0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 + }; + static const int ilb[32] = + { + 2048, 2093, 2139, 2186, 2233, 2282, 2332, + 2383, 2435, 2489, 2543, 2599, 2656, 2714, + 2774, 2834, 2896, 2960, 3025, 3091, 3158, + 3228, 3298, 3371, 3444, 3520, 3597, 3676, + 3756, 3838, 3922, 4008 + }; + static const int qm4[16] = + { + 0, -20456, -12896, -8968, + -6288, -4240, -2584, -1200, + 20456, 12896, 8968, 6288, + 4240, 2584, 1200, 0 + }; + static const int qm2[4] = + { + -7408, -1616, 7408, 1616 + }; + static const int qmf_coeffs[12] = + { + 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, + }; + static const int ihn[3] = {0, 1, 0}; + static const int ihp[3] = {0, 3, 2}; + static const int wh[3] = {0, -214, 798}; + static const int rh2[4] = {2, 1, 2, 1}; + + int dlow; + int dhigh; + int el; + int wd; + int wd1; + int ril; + int wd2; + int il4; + int ih2; + int wd3; + int eh; + int mih; + int i; + int j; + /* Low and high band PCM from the QMF */ + int xlow; + int xhigh; + int g722_bytes; + /* Even and odd tap accumulators */ + int sumeven; + int sumodd; + int ihigh; + int ilow; + int code; + + 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) + { + xlow = amp[j++]; + } + else + { + /* Apply the transmit QMF */ + /* Shuffle the buffer down */ + for (i = 0; i < 22; i++) + s->x[i] = s->x[i + 2]; + s->x[22] = amp[j++]; + s->x[23] = amp[j++]; + + /* Discard every other QMF output */ + sumeven = 0; + sumodd = 0; + for (i = 0; i < 12; i++) + { + sumodd += s->x[2*i]*qmf_coeffs[i]; + sumeven += s->x[2*i + 1]*qmf_coeffs[11 - i]; + } + xlow = (sumeven + sumodd) >> 13; + xhigh = (sumeven - sumodd) >> 13; + } + } + /* Block 1L, SUBTRA */ + el = saturate(xlow - s->band[0].s); + + /* Block 1L, QUANTL */ + wd = (el >= 0) ? el : -(el + 1); + + for (i = 1; i < 30; i++) + { + wd1 = (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 = (s->band[0].det*wd2) >> 15; + + /* Block 3L, LOGSCL */ + il4 = rl42[ril]; + wd = (s->band[0].nb*127) >> 7; + s->band[0].nb = 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 = wd3 << 2; + + block4(s, 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 = saturate(xhigh - s->band[1].s); + + /* Block 1H, QUANTH */ + wd = (eh >= 0) ? eh : -(eh + 1); + 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 = (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 ------------------------------------------------------------*/ -- cgit v1.2.3