/* * SpanDSP - a series of DSP components for telephony * * g722_decode.c - The ITU G.722 codec, decode part. * * Written by Steve Underwood * * 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 */ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #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] << 2); 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 ------------------------------------------------------------*/