| /* |
| * 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 194722 2009-05-15 17:59:08Z russell $ |
| */ |
| |
| /*! \file */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <inttypes.h> |
| #include <stdlib.h> |
| |
| #include "g722_typedefs.h" |
| #include "g722_enc_dec.h" |
| |
| #if !defined(FALSE) |
| #define FALSE 0 |
| #endif |
| #if !defined(TRUE) |
| #define TRUE (!FALSE) |
| #endif |
| |
| #define PACKED_INPUT (0) |
| #define BITS_PER_SAMPLE (8) |
| |
| #ifndef BUILD_FEATURE_G722_USE_INTRINSIC_SAT |
| static __inline int16_t __ssat16(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 > 0x7fff) |
| return 0x7fff; |
| return 0x8000; |
| } |
| /*- End of function --------------------------------------------------------*/ |
| #else |
| static __inline int16_t __ssat16( int32_t val) |
| { |
| register int32_t res; |
| __asm volatile ( |
| "SSAT %0, #16, %1\n\t" |
| :"=r"(res) |
| :"r"(val) |
| :); |
| return (int16_t)res; |
| } |
| #endif |
| |
| /*- End of function --------------------------------------------------------*/ |
| |
| static void block4(g722_band_t *band, int d); |
| |
| static void block4(g722_band_t *band, int d) |
| { |
| int wd1; |
| int wd2; |
| int wd3; |
| int i; |
| int sg[7]; |
| int ap1, ap2; |
| int sg0, sgi; |
| int sz; |
| |
| /* Block 4, RECONS */ |
| band->d[0] = d; |
| band->r[0] = __ssat16(band->s + d); |
| |
| /* Block 4, PARREC */ |
| band->p[0] = __ssat16(band->sz + d); |
| |
| /* Block 4, UPPOL2 */ |
| for (i = 0; i < 3; i++) |
| { |
| sg[i] = band->p[i] >> 15; |
| } |
| wd1 = __ssat16(band->a[1] << 2); |
| |
| wd2 = (sg[0] == sg[1]) ? -wd1 : wd1; |
| if (wd2 > 32767) |
| wd2 = 32767; |
| |
| ap2 = (sg[0] == sg[2]) ? 128 : -128; |
| ap2 += (wd2 >> 7); |
| ap2 += (band->a[2]*32512) >> 15; |
| if (ap2 > 12288) |
| ap2 = 12288; |
| else if (ap2 < -12288) |
| ap2 = -12288; |
| band->ap[2] = ap2; |
| |
| /* Block 4, UPPOL1 */ |
| sg[0] = band->p[0] >> 15; |
| sg[1] = band->p[1] >> 15; |
| wd1 = (sg[0] == sg[1]) ? 192 : -192; |
| wd2 = (band->a[1]*32640) >> 15; |
| |
| ap1 = __ssat16(wd1 + wd2); |
| wd3 = __ssat16(15360 - band->ap[2]); |
| if (ap1 > wd3) |
| ap1 = wd3; |
| else if (ap1 < -wd3) |
| ap1 = -wd3; |
| band->ap[1] = ap1; |
| |
| /* Block 4, UPZERO */ |
| /* Block 4, FILTEZ */ |
| wd1 = (d == 0) ? 0 : 128; |
| |
| sg0 = sg[0] = d >> 15; |
| for (i = 1; i < 7; i++) |
| { |
| sgi = band->d[i] >> 15; |
| wd2 = (sgi == sg0) ? wd1 : -wd1; |
| wd3 = (band->b[i]*32640) >> 15; |
| band->bp[i] = __ssat16(wd2 + wd3); |
| } |
| |
| /* Block 4, DELAYA */ |
| sz = 0; |
| for (i = 6; i > 0; i--) |
| { |
| int bi; |
| |
| band->d[i] = band->d[i - 1]; |
| bi = band->b[i] = band->bp[i]; |
| wd1 = __ssat16(band->d[i] + band->d[i]); |
| sz += (bi*wd1) >> 15; |
| } |
| band->sz = sz; |
| |
| for (i = 2; i > 0; i--) |
| { |
| band->r[i] = band->r[i - 1]; |
| band->p[i] = band->p[i - 1]; |
| band->a[i] = band->ap[i]; |
| } |
| |
| /* Block 4, FILTEP */ |
| wd1 = __ssat16(band->r[1] + band->r[1]); |
| wd1 = (band->a[1]*wd1) >> 15; |
| wd2 = __ssat16(band->r[2] + band->r[2]); |
| wd2 = (band->a[2]*wd2) >> 15; |
| band->sp = __ssat16(wd1 + wd2); |
| |
| /* Block 4, PREDIC */ |
| band->s = __ssat16(band->sp + band->sz); |
| } |
| /*- End of function --------------------------------------------------------*/ |
| |
| g722_decode_state_t *g722_decode_init(g722_decode_state_t *s, unsigned int rate, int options) |
| { |
| if (s == NULL) |
| { |
| #ifdef G722_SUPPORT_MALLOC |
| if ((s = (g722_decode_state_t *) malloc(sizeof(*s))) == NULL) |
| #endif |
| 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; |
| s->dac_pcm = options & G722_FORMAT_DAC12; |
| s->band[0].det = 32; |
| s->band[1].det = 8; |
| return s; |
| } |
| /*- End of function --------------------------------------------------------*/ |
| |
| int g722_decode_release(g722_decode_state_t *s) |
| { |
| free(s); |
| return 0; |
| } |
| /*- End of function --------------------------------------------------------*/ |
| |
| static int16_t wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 }; |
| static int16_t rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 }; |
| static int16_t 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 int16_t wh[3] = {0, -214, 798}; |
| static int16_t rh2[4] = {2, 1, 2, 1}; |
| static int16_t qm2[4] = {-7408, -1616, 7408, 1616}; |
| static int16_t qm4[16] = |
| { |
| 0, -20456, -12896, -8968, |
| -6288, -4240, -2584, -1200, |
| 20456, 12896, 8968, 6288, |
| 4240, 2584, 1200, 0 |
| }; |
| #if 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 |
| }; |
| #endif |
| static int16_t 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 int16_t qmf_coeffs_even[12] = |
| { |
| 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, |
| }; |
| static int16_t qmf_coeffs_odd[12] = |
| { |
| -11, 53, -156, 362, -805, 3876, 951, -210, 32, 12, -11, 3 |
| }; |
| |
| uint32_t g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len, uint16_t gain) |
| { |
| |
| int dlowt; |
| int rlow; |
| int ihigh; |
| int dhigh; |
| int rhigh; |
| int xout1; |
| int xout2; |
| int wd1; |
| int wd2; |
| int wd3; |
| int code; |
| uint32_t outlen; |
| int i; |
| int j; |
| |
| outlen = 0; |
| rhigh = 0; |
| |
| for (j = 0; j < len; ) |
| { |
| #if PACKED_INPUT == 1 |
| /* 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++]; |
| #endif |
| |
| #if BITS_PER_SAMPLE == 8 |
| wd1 = code & 0x3F; |
| ihigh = (code >> 6) & 0x03; |
| wd2 = qm6[wd1]; |
| wd1 >>= 2; |
| #elif BITS_PER_SAMPLE == 7 |
| wd1 = code & 0x1F; |
| ihigh = (code >> 5) & 0x03; |
| wd2 = qm5[wd1]; |
| wd1 >>= 1; |
| #elif BITS_PER_SAMPLE == 6 |
| wd1 = code & 0x0F; |
| ihigh = (code >> 4) & 0x03; |
| wd2 = qm4[wd1]; |
| #endif |
| /* Block 5L, LOW BAND INVQBL */ |
| wd2 = (s->band[0].det*wd2) >> 15; |
| /* Block 5L, RECONS */ |
| rlow = s->band[0].s + wd2; |
| /* Block 6L, LIMIT */ |
| |
| // ANDREA |
| // rlow=ssat(rlow,2<<14) |
| 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->band[0], dlowt); |
| |
| /* 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 */ |
| |
| // ANDREA |
| // rhigh=ssat(rhigh,2<<14) |
| |
| 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->band[1], dhigh); |
| |
| /* 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; |
| |
| // we should get PERF numbers for the following loop |
| xout1 = 0; |
| xout2 = 0; |
| for (i = 0; i < 12; i++) |
| { |
| xout2 += s->x[2*i] * qmf_coeffs_even[i]; |
| xout1 += s->x[2*i+1] * qmf_coeffs_odd[i]; |
| } |
| xout1 = NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN((int16_t) __ssat16(xout1 >> 11), gain); |
| xout2 = NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN((int16_t) __ssat16(xout2 >> 11), gain); |
| if (s->dac_pcm) |
| { |
| amp[outlen++] = ((int16_t) (xout1 >> 4) + 2048); |
| amp[outlen++] = ((int16_t) (xout2 >> 4) + 2048); |
| } |
| else |
| { |
| amp[outlen++] = xout1; |
| amp[outlen++] = xout2; |
| } |
| } |
| return outlen; |
| } |
| /*- End of function --------------------------------------------------------*/ |
| /*- End of file ------------------------------------------------------------*/ |
