| /* |
| * SpanDSP - a series of DSP components for telephony |
| * |
| * g722_decode.c - The ITU G.722 codec, decode part. |
| * |
| * Written by Steve Underwood <steveu@coppice.org> |
| * |
| * Copyright (C) 2005 Steve Underwood |
| * |
| * 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 in part on a single channel G.722 codec which is: |
| * |
| * Copyright (c) CMU 1993 |
| * Computer Science, Speech Group |
| * Chengxiang Lu and Alex Hauptmann |
| * |
| * $Id: g722_decode.c,v 1.15 2006/07/07 16:37:49 steveu Exp $ |
| * |
| * Modifications for WebRtc, 2011/04/28, by tlegrand: |
| * -Removed usage of inttypes.h and tgmath.h |
| * -Changed to use WebRtc types |
| * -Changed __inline__ to __inline |
| * -Added saturation check on output |
| */ |
| |
| /*! \file */ |
| |
| |
| #include <memory.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "g722_enc_dec.h" |
| #include "webrtc/typedefs.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 > WEBRTC_INT16_MAX) |
| return WEBRTC_INT16_MAX; |
| return WEBRTC_INT16_MIN; |
| } |
| /*- End of function --------------------------------------------------------*/ |
| |
| static void block4(G722DecoderState *s, int band, int d); |
| |
| static void block4(G722DecoderState *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] * 4); |
| |
| wd2 = (s->band[band].sg[0] == s->band[band].sg[1]) ? -wd1 : wd1; |
| if (wd2 > 32767) |
| wd2 = 32767; |
| wd3 = (s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128; |
| wd3 += (wd2 >> 7); |
| 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 --------------------------------------------------------*/ |
| |
| G722DecoderState* WebRtc_g722_decode_init(G722DecoderState* s, |
| int rate, |
| int options) { |
| s = s ? s : malloc(sizeof(*s)); |
| 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 WebRtc_g722_decode_release(G722DecoderState *s) |
| { |
| free(s); |
| return 0; |
| } |
| /*- End of function --------------------------------------------------------*/ |
| |
| size_t WebRtc_g722_decode(G722DecoderState *s, int16_t amp[], |
| const uint8_t g722_data[], size_t len) |
| { |
| 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 wh[3] = {0, -214, 798}; |
| static const int rh2[4] = {2, 1, 2, 1}; |
| static const int qm2[4] = {-7408, -1616, 7408, 1616}; |
| static const int qm4[16] = |
| { |
| 0, -20456, -12896, -8968, |
| -6288, -4240, -2584, -1200, |
| 20456, 12896, 8968, 6288, |
| 4240, 2584, 1200, 0 |
| }; |
| static const int qm5[32] = |
| { |
| -280, -280, -23352, -17560, |
| -14120, -11664, -9752, -8184, |
| -6864, -5712, -4696, -3784, |
| -2960, -2208, -1520, -880, |
| 23352, 17560, 14120, 11664, |
| 9752, 8184, 6864, 5712, |
| 4696, 3784, 2960, 2208, |
| 1520, 880, 280, -280 |
| }; |
| static const int qm6[64] = |
| { |
| -136, -136, -136, -136, |
| -24808, -21904, -19008, -16704, |
| -14984, -13512, -12280, -11192, |
| -10232, -9360, -8576, -7856, |
| -7192, -6576, -6000, -5456, |
| -4944, -4464, -4008, -3576, |
| -3168, -2776, -2400, -2032, |
| -1688, -1360, -1040, -728, |
| 24808, 21904, 19008, 16704, |
| 14984, 13512, 12280, 11192, |
| 10232, 9360, 8576, 7856, |
| 7192, 6576, 6000, 5456, |
| 4944, 4464, 4008, 3576, |
| 3168, 2776, 2400, 2032, |
| 1688, 1360, 1040, 728, |
| 432, 136, -432, -136 |
| }; |
| static const int qmf_coeffs[12] = |
| { |
| 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, |
| }; |
| |
| int dlowt; |
| int rlow; |
| int ihigh; |
| int dhigh; |
| int rhigh; |
| int xout1; |
| int xout2; |
| int wd1; |
| int wd2; |
| int wd3; |
| int code; |
| size_t outlen; |
| int i; |
| size_t j; |
| |
| outlen = 0; |
| rhigh = 0; |
| for (j = 0; j < len; ) |
| { |
| if (s->packed) |
| { |
| /* Unpack the code bits */ |
| if (s->in_bits < s->bits_per_sample) |
| { |
| s->in_buffer |= (g722_data[j++] << s->in_bits); |
| s->in_bits += 8; |
| } |
| code = s->in_buffer & ((1 << s->bits_per_sample) - 1); |
| s->in_buffer >>= s->bits_per_sample; |
| s->in_bits -= s->bits_per_sample; |
| } |
| else |
| { |
| code = g722_data[j++]; |
| } |
| |
| switch (s->bits_per_sample) |
| { |
| default: |
| case 8: |
| wd1 = code & 0x3F; |
| ihigh = (code >> 6) & 0x03; |
| wd2 = qm6[wd1]; |
| wd1 >>= 2; |
| break; |
| case 7: |
| wd1 = code & 0x1F; |
| ihigh = (code >> 5) & 0x03; |
| wd2 = qm5[wd1]; |
| wd1 >>= 1; |
| break; |
| case 6: |
| wd1 = code & 0x0F; |
| ihigh = (code >> 4) & 0x03; |
| wd2 = qm4[wd1]; |
| break; |
| } |
| /* Block 5L, LOW BAND INVQBL */ |
| wd2 = (s->band[0].det*wd2) >> 15; |
| /* Block 5L, RECONS */ |
| rlow = s->band[0].s + wd2; |
| /* Block 6L, LIMIT */ |
| if (rlow > 16383) |
| rlow = 16383; |
| else if (rlow < -16384) |
| rlow = -16384; |
| |
| /* Block 2L, INVQAL */ |
| wd2 = qm4[wd1]; |
| dlowt = (s->band[0].det*wd2) >> 15; |
| |
| /* Block 3L, LOGSCL */ |
| wd2 = rl42[wd1]; |
| wd1 = (s->band[0].nb*127) >> 7; |
| wd1 += wl[wd2]; |
| if (wd1 < 0) |
| wd1 = 0; |
| else if (wd1 > 18432) |
| wd1 = 18432; |
| s->band[0].nb = wd1; |
| |
| /* 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, dlowt); |
| |
| if (!s->eight_k) |
| { |
| /* Block 2H, INVQAH */ |
| wd2 = qm2[ihigh]; |
| dhigh = (s->band[1].det*wd2) >> 15; |
| /* Block 5H, RECONS */ |
| rhigh = dhigh + s->band[1].s; |
| /* Block 6H, LIMIT */ |
| if (rhigh > 16383) |
| rhigh = 16383; |
| else if (rhigh < -16384) |
| rhigh = -16384; |
| |
| /* Block 2H, INVQAH */ |
| wd2 = rh2[ihigh]; |
| wd1 = (s->band[1].nb*127) >> 7; |
| wd1 += wh[wd2]; |
| if (wd1 < 0) |
| wd1 = 0; |
| else if (wd1 > 22528) |
| 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]; |
| } |
| /* We shift by 12 to allow for the QMF filters (DC gain = 4096), less 1 |
| to allow for the 15 bit input to the G.722 algorithm. */ |
| /* WebRtc, tlegrand: added saturation */ |
| amp[outlen++] = saturate(xout1 >> 11); |
| amp[outlen++] = saturate(xout2 >> 11); |
| } |
| } |
| } |
| return outlen; |
| } |
| /*- End of function --------------------------------------------------------*/ |
| /*- End of file ------------------------------------------------------------*/ |
