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ps_dec.c
资源名称：tcpmp.rar [点击查看]
上传用户：wstnjxml
上传日期：2014-04-03
资源大小：7248k
文件大小：69k
源码类别：
Windows CE
开发平台：
C/C++
- /* ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR and PS decoding ** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License as published by ** the Free Software Foundation; either version 2 of the License, or ** (at your option) any later version. ** ** This program is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** GNU General Public License for more details. ** ** You should have received a copy of the GNU General Public License ** along with this program; if not, write to the Free Software ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ** ** Any non-GPL usage of this software or parts of this software is strictly ** forbidden. ** ** Commercial non-GPL licensing of this software is possible. ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. ** ** $Id: ps_dec.c,v 1.10 2004/09/04 14:56:28 menno Exp $ **/ #include "common.h" #ifdef PS_DEC #include <stdlib.h> #include "ps_dec.h" #include "ps_tables.h" /* constants */ #define NEGATE_IPD_MASK (0x1000) #define DECAY_SLOPE FRAC_CONST(0.05) #define COEF_SQRT2 COEF_CONST(1.4142135623731) /* tables */ /* filters are mirrored in coef 6, second half left out */ static const real_t p8_13_20[7] = { FRAC_CONST(0.00746082949812), FRAC_CONST(0.02270420949825), FRAC_CONST(0.04546865930473), FRAC_CONST(0.07266113929591), FRAC_CONST(0.09885108575264), FRAC_CONST(0.11793710567217), FRAC_CONST(0.125) }; static const real_t p2_13_20[7] = { FRAC_CONST(0.0), FRAC_CONST(0.01899487526049), FRAC_CONST(0.0), FRAC_CONST(-0.07293139167538), FRAC_CONST(0.0), FRAC_CONST(0.30596630545168), FRAC_CONST(0.5) }; static const real_t p12_13_34[7] = { FRAC_CONST(0.04081179924692), FRAC_CONST(0.03812810994926), FRAC_CONST(0.05144908135699), FRAC_CONST(0.06399831151592), FRAC_CONST(0.07428313801106), FRAC_CONST(0.08100347892914), FRAC_CONST(0.08333333333333) }; static const real_t p8_13_34[7] = { FRAC_CONST(0.01565675600122), FRAC_CONST(0.03752716391991), FRAC_CONST(0.05417891378782), FRAC_CONST(0.08417044116767), FRAC_CONST(0.10307344158036), FRAC_CONST(0.12222452249753), FRAC_CONST(0.125) }; static const real_t p4_13_34[7] = { FRAC_CONST(-0.05908211155639), FRAC_CONST(-0.04871498374946), FRAC_CONST(0.0), FRAC_CONST(0.07778723915851), FRAC_CONST(0.16486303567403), FRAC_CONST(0.23279856662996), FRAC_CONST(0.25) }; #ifdef PARAM_32KHZ static const uint8_t delay_length_d[2][NO_ALLPASS_LINKS] = { { 1, 2, 3 } /* d_24kHz */, { 3, 4, 5 } /* d_48kHz */ }; #else static const uint8_t delay_length_d[NO_ALLPASS_LINKS] = { 3, 4, 5 /* d_48kHz */ }; #endif static const real_t filter_a[NO_ALLPASS_LINKS] = { /* a(m) = exp(-d_48kHz(m)/7) */ FRAC_CONST(0.65143905753106), FRAC_CONST(0.56471812200776), FRAC_CONST(0.48954165955695) }; static const uint8_t group_border20[10+12 + 1] = { 6, 7, 0, 1, 2, 3, /* 6 subqmf subbands */ 9, 8, /* 2 subqmf subbands */ 10, 11, /* 2 subqmf subbands */ 3, 4, 5, 6, 7, 8, 9, 11, 14, 18, 23, 35, 64 }; static const uint8_t group_border34[32+18 + 1] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, /* 12 subqmf subbands */ 12, 13, 14, 15, 16, 17, 18, 19, /* 8 subqmf subbands */ 20, 21, 22, 23, /* 4 subqmf subbands */ 24, 25, 26, 27, /* 4 subqmf subbands */ 28, 29, 30, 31, /* 4 subqmf subbands */ 32-27, 33-27, 34-27, 35-27, 36-27, 37-27, 38-27, 40-27, 42-27, 44-27, 46-27, 48-27, 51-27, 54-27, 57-27, 60-27, 64-27, 68-27, 91-27 }; static const uint16_t map_group2bk20[10+12] = { (NEGATE_IPD_MASK | 1), (NEGATE_IPD_MASK | 0), 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 }; static const uint16_t map_group2bk34[32+18] = { 0, 1, 2, 3, 4, 5, 6, 6, 7, (NEGATE_IPD_MASK | 2), (NEGATE_IPD_MASK | 1), (NEGATE_IPD_MASK | 0), 10, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 9, 14, 11, 12, 13, 14, 15, 16, 13, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 }; /* type definitions */ typedef struct { uint8_t frame_len; uint8_t resolution20[3]; uint8_t resolution34[5]; qmf_t *work; qmf_t **buffer; qmf_t **temp; } hyb_info; /* static function declarations */ static void ps_data_decode(ps_info *ps); static hyb_info *hybrid_init(); static void channel_filter2(hyb_info *hyb, uint8_t frame_len, const real_t *filter, qmf_t *buffer, qmf_t **X_hybrid); static void INLINE DCT3_4_unscaled(real_t *y, real_t *x); static void channel_filter8(hyb_info *hyb, uint8_t frame_len, const real_t *filter, qmf_t *buffer, qmf_t **X_hybrid); static void hybrid_analysis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32], uint8_t use34); static void hybrid_synthesis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32], uint8_t use34); static int8_t delta_clip(int8_t i, int8_t min, int8_t max); static void delta_decode(uint8_t enable, int8_t *index, int8_t *index_prev, uint8_t dt_flag, uint8_t nr_par, uint8_t stride, int8_t min_index, int8_t max_index); static void delta_modulo_decode(uint8_t enable, int8_t *index, int8_t *index_prev, uint8_t dt_flag, uint8_t nr_par, uint8_t stride, int8_t log2modulo); static void map20indexto34(int8_t *index, uint8_t bins); #ifdef PS_LOW_POWER static void map34indexto20(int8_t *index, uint8_t bins); #endif static void ps_data_decode(ps_info *ps); static void ps_decorrelate(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64], qmf_t X_hybrid_left[32][32], qmf_t X_hybrid_right[32][32]); static void ps_mix_phase(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64], qmf_t X_hybrid_left[32][32], qmf_t X_hybrid_right[32][32]); /* */ static hyb_info *hybrid_init() { uint8_t i; hyb_info *hyb = (hyb_info*)faad_malloc(sizeof(hyb_info)); hyb->resolution34[0] = 12; hyb->resolution34[1] = 8; hyb->resolution34[2] = 4; hyb->resolution34[3] = 4; hyb->resolution34[4] = 4; hyb->resolution20[0] = 8; hyb->resolution20[1] = 2; hyb->resolution20[2] = 2; hyb->frame_len = 32; hyb->work = (qmf_t*)faad_malloc((hyb->frame_len+12) * sizeof(qmf_t)); memset(hyb->work, 0, (hyb->frame_len+12) * sizeof(qmf_t)); hyb->buffer = (qmf_t**)faad_malloc(5 * sizeof(qmf_t*)); for (i = 0; i < 5; i++) { hyb->buffer[i] = (qmf_t*)faad_malloc(hyb->frame_len * sizeof(qmf_t)); memset(hyb->buffer[i], 0, hyb->frame_len * sizeof(qmf_t)); } hyb->temp = (qmf_t**)faad_malloc(hyb->frame_len * sizeof(qmf_t*)); for (i = 0; i < hyb->frame_len; i++) { hyb->temp[i] = (qmf_t*)faad_malloc(12 /*max*/ * sizeof(qmf_t)); } return hyb; } static void hybrid_free(hyb_info *hyb) { uint8_t i; if (hyb->work) faad_free(hyb->work); for (i = 0; i < 5; i++) { if (hyb->buffer[i]) faad_free(hyb->buffer[i]); } if (hyb->buffer) faad_free(hyb->buffer); for (i = 0; i < hyb->frame_len; i++) { if (hyb->temp[i]) faad_free(hyb->temp[i]); } if (hyb->temp) faad_free(hyb->temp);
- faad_free(hyb);
- } /* real filter, size 2 */ static void channel_filter2(hyb_info *hyb, uint8_t frame_len, const real_t *filter, qmf_t *buffer, qmf_t **X_hybrid) { uint8_t i; for (i = 0; i < frame_len; i++) { real_t r0 = MUL_F(filter[0],(QMF_RE(buffer[0+i]) + QMF_RE(buffer[12+i]))); real_t r1 = MUL_F(filter[1],(QMF_RE(buffer[1+i]) + QMF_RE(buffer[11+i]))); real_t r2 = MUL_F(filter[2],(QMF_RE(buffer[2+i]) + QMF_RE(buffer[10+i]))); real_t r3 = MUL_F(filter[3],(QMF_RE(buffer[3+i]) + QMF_RE(buffer[9+i]))); real_t r4 = MUL_F(filter[4],(QMF_RE(buffer[4+i]) + QMF_RE(buffer[8+i]))); real_t r5 = MUL_F(filter[5],(QMF_RE(buffer[5+i]) + QMF_RE(buffer[7+i]))); real_t r6 = MUL_F(filter[6],QMF_RE(buffer[6+i])); real_t i0 = MUL_F(filter[0],(QMF_IM(buffer[0+i]) + QMF_IM(buffer[12+i]))); real_t i1 = MUL_F(filter[1],(QMF_IM(buffer[1+i]) + QMF_IM(buffer[11+i]))); real_t i2 = MUL_F(filter[2],(QMF_IM(buffer[2+i]) + QMF_IM(buffer[10+i]))); real_t i3 = MUL_F(filter[3],(QMF_IM(buffer[3+i]) + QMF_IM(buffer[9+i]))); real_t i4 = MUL_F(filter[4],(QMF_IM(buffer[4+i]) + QMF_IM(buffer[8+i]))); real_t i5 = MUL_F(filter[5],(QMF_IM(buffer[5+i]) + QMF_IM(buffer[7+i]))); real_t i6 = MUL_F(filter[6],QMF_IM(buffer[6+i])); /* q = 0 */ QMF_RE(X_hybrid[i][0]) = r0 + r1 + r2 + r3 + r4 + r5 + r6; QMF_IM(X_hybrid[i][0]) = i0 + i1 + i2 + i3 + i4 + i5 + i6; /* q = 1 */ QMF_RE(X_hybrid[i][1]) = r0 - r1 + r2 - r3 + r4 - r5 + r6; QMF_IM(X_hybrid[i][1]) = i0 - i1 + i2 - i3 + i4 - i5 + i6; } } /* complex filter, size 4 */ static void channel_filter4(hyb_info *hyb, uint8_t frame_len, const real_t *filter, qmf_t *buffer, qmf_t **X_hybrid) { uint8_t i; real_t input_re1[2], input_re2[2], input_im1[2], input_im2[2]; for (i = 0; i < frame_len; i++) { input_re1[0] = -MUL_F(filter[2], (QMF_RE(buffer[i+2]) + QMF_RE(buffer[i+10]))) + MUL_F(filter[6], QMF_RE(buffer[i+6])); input_re1[1] = MUL_F(FRAC_CONST(-0.70710678118655), (MUL_F(filter[1], (QMF_RE(buffer[i+1]) + QMF_RE(buffer[i+11]))) + MUL_F(filter[3], (QMF_RE(buffer[i+3]) + QMF_RE(buffer[i+9]))) - MUL_F(filter[5], (QMF_RE(buffer[i+5]) + QMF_RE(buffer[i+7]))))); input_im1[0] = MUL_F(filter[0], (QMF_IM(buffer[i+0]) - QMF_IM(buffer[i+12]))) - MUL_F(filter[4], (QMF_IM(buffer[i+4]) - QMF_IM(buffer[i+8]))); input_im1[1] = MUL_F(FRAC_CONST(0.70710678118655), (MUL_F(filter[1], (QMF_IM(buffer[i+1]) - QMF_IM(buffer[i+11]))) - MUL_F(filter[3], (QMF_IM(buffer[i+3]) - QMF_IM(buffer[i+9]))) - MUL_F(filter[5], (QMF_IM(buffer[i+5]) - QMF_IM(buffer[i+7]))))); input_re2[0] = MUL_F(filter[0], (QMF_RE(buffer[i+0]) - QMF_RE(buffer[i+12]))) - MUL_F(filter[4], (QMF_RE(buffer[i+4]) - QMF_RE(buffer[i+8]))); input_re2[1] = MUL_F(FRAC_CONST(0.70710678118655), (MUL_F(filter[1], (QMF_RE(buffer[i+1]) - QMF_RE(buffer[i+11]))) - MUL_F(filter[3], (QMF_RE(buffer[i+3]) - QMF_RE(buffer[i+9]))) - MUL_F(filter[5], (QMF_RE(buffer[i+5]) - QMF_RE(buffer[i+7]))))); input_im2[0] = -MUL_F(filter[2], (QMF_IM(buffer[i+2]) + QMF_IM(buffer[i+10]))) + MUL_F(filter[6], QMF_IM(buffer[i+6])); input_im2[1] = MUL_F(FRAC_CONST(-0.70710678118655), (MUL_F(filter[1], (QMF_IM(buffer[i+1]) + QMF_IM(buffer[i+11]))) + MUL_F(filter[3], (QMF_IM(buffer[i+3]) + QMF_IM(buffer[i+9]))) - MUL_F(filter[5], (QMF_IM(buffer[i+5]) + QMF_IM(buffer[i+7]))))); /* q == 0 */ QMF_RE(X_hybrid[i][0]) = input_re1[0] + input_re1[1] + input_im1[0] + input_im1[1]; QMF_IM(X_hybrid[i][0]) = -input_re2[0] - input_re2[1] + input_im2[0] + input_im2[1]; /* q == 1 */ QMF_RE(X_hybrid[i][1]) = input_re1[0] - input_re1[1] - input_im1[0] + input_im1[1]; QMF_IM(X_hybrid[i][1]) = input_re2[0] - input_re2[1] + input_im2[0] - input_im2[1]; /* q == 2 */ QMF_RE(X_hybrid[i][2]) = input_re1[0] - input_re1[1] + input_im1[0] - input_im1[1]; QMF_IM(X_hybrid[i][2]) = -input_re2[0] + input_re2[1] + input_im2[0] - input_im2[1]; /* q == 3 */ QMF_RE(X_hybrid[i][3]) = input_re1[0] + input_re1[1] - input_im1[0] - input_im1[1]; QMF_IM(X_hybrid[i][3]) = input_re2[0] + input_re2[1] + input_im2[0] + input_im2[1]; } } static void INLINE DCT3_4_unscaled(real_t *y, real_t *x) { real_t f0, f1, f2, f3, f4, f5, f6, f7, f8; f0 = MUL_F(x[2], FRAC_CONST(0.7071067811865476)); f1 = x[0] - f0; f2 = x[0] + f0; f3 = x[1] + x[3]; f4 = MUL_C(x[1], COEF_CONST(1.3065629648763766)); f5 = MUL_F(f3, FRAC_CONST(-0.9238795325112866)); f6 = MUL_F(x[3], FRAC_CONST(-0.5411961001461967)); f7 = f4 + f5; f8 = f6 - f5; y[3] = f2 - f8; y[0] = f2 + f8; y[2] = f1 - f7; y[1] = f1 + f7; } /* complex filter, size 8 */ static void channel_filter8(hyb_info *hyb, uint8_t frame_len, const real_t *filter, qmf_t *buffer, qmf_t **X_hybrid) { uint8_t i, n; real_t input_re1[4], input_re2[4], input_im1[4], input_im2[4]; real_t x[4]; for (i = 0; i < frame_len; i++) { input_re1[0] = MUL_F(filter[6],QMF_RE(buffer[6+i])); input_re1[1] = MUL_F(filter[5],(QMF_RE(buffer[5+i]) + QMF_RE(buffer[7+i]))); input_re1[2] = -MUL_F(filter[0],(QMF_RE(buffer[0+i]) + QMF_RE(buffer[12+i]))) + MUL_F(filter[4],(QMF_RE(buffer[4+i]) + QMF_RE(buffer[8+i]))); input_re1[3] = -MUL_F(filter[1],(QMF_RE(buffer[1+i]) + QMF_RE(buffer[11+i]))) + MUL_F(filter[3],(QMF_RE(buffer[3+i]) + QMF_RE(buffer[9+i]))); input_im1[0] = MUL_F(filter[5],(QMF_IM(buffer[7+i]) - QMF_IM(buffer[5+i]))); input_im1[1] = MUL_F(filter[0],(QMF_IM(buffer[12+i]) - QMF_IM(buffer[0+i]))) + MUL_F(filter[4],(QMF_IM(buffer[8+i]) - QMF_IM(buffer[4+i]))); input_im1[2] = MUL_F(filter[1],(QMF_IM(buffer[11+i]) - QMF_IM(buffer[1+i]))) + MUL_F(filter[3],(QMF_IM(buffer[9+i]) - QMF_IM(buffer[3+i]))); input_im1[3] = MUL_F(filter[2],(QMF_IM(buffer[10+i]) - QMF_IM(buffer[2+i]))); for (n = 0; n < 4; n++) { x[n] = input_re1[n] - input_im1[3-n]; } DCT3_4_unscaled(x, x); QMF_RE(X_hybrid[i][7]) = x[0]; QMF_RE(X_hybrid[i][5]) = x[2]; QMF_RE(X_hybrid[i][3]) = x[3]; QMF_RE(X_hybrid[i][1]) = x[1]; for (n = 0; n < 4; n++) { x[n] = input_re1[n] + input_im1[3-n]; } DCT3_4_unscaled(x, x); QMF_RE(X_hybrid[i][6]) = x[1]; QMF_RE(X_hybrid[i][4]) = x[3]; QMF_RE(X_hybrid[i][2]) = x[2]; QMF_RE(X_hybrid[i][0]) = x[0]; input_im2[0] = MUL_F(filter[6],QMF_IM(buffer[6+i])); input_im2[1] = MUL_F(filter[5],(QMF_IM(buffer[5+i]) + QMF_IM(buffer[7+i]))); input_im2[2] = -MUL_F(filter[0],(QMF_IM(buffer[0+i]) + QMF_IM(buffer[12+i]))) + MUL_F(filter[4],(QMF_IM(buffer[4+i]) + QMF_IM(buffer[8+i]))); input_im2[3] = -MUL_F(filter[1],(QMF_IM(buffer[1+i]) + QMF_IM(buffer[11+i]))) + MUL_F(filter[3],(QMF_IM(buffer[3+i]) + QMF_IM(buffer[9+i]))); input_re2[0] = MUL_F(filter[5],(QMF_RE(buffer[7+i]) - QMF_RE(buffer[5+i]))); input_re2[1] = MUL_F(filter[0],(QMF_RE(buffer[12+i]) - QMF_RE(buffer[0+i]))) + MUL_F(filter[4],(QMF_RE(buffer[8+i]) - QMF_RE(buffer[4+i]))); input_re2[2] = MUL_F(filter[1],(QMF_RE(buffer[11+i]) - QMF_RE(buffer[1+i]))) + MUL_F(filter[3],(QMF_RE(buffer[9+i]) - QMF_RE(buffer[3+i]))); input_re2[3] = MUL_F(filter[2],(QMF_RE(buffer[10+i]) - QMF_RE(buffer[2+i]))); for (n = 0; n < 4; n++) { x[n] = input_im2[n] + input_re2[3-n]; } DCT3_4_unscaled(x, x); QMF_IM(X_hybrid[i][7]) = x[0]; QMF_IM(X_hybrid[i][5]) = x[2]; QMF_IM(X_hybrid[i][3]) = x[3]; QMF_IM(X_hybrid[i][1]) = x[1]; for (n = 0; n < 4; n++) { x[n] = input_im2[n] - input_re2[3-n]; } DCT3_4_unscaled(x, x); QMF_IM(X_hybrid[i][6]) = x[1]; QMF_IM(X_hybrid[i][4]) = x[3]; QMF_IM(X_hybrid[i][2]) = x[2]; QMF_IM(X_hybrid[i][0]) = x[0]; } } static void INLINE DCT3_6_unscaled(real_t *y, real_t *x) { real_t f0, f1, f2, f3, f4, f5, f6, f7; f0 = MUL_F(x[3], FRAC_CONST(0.70710678118655)); f1 = x[0] + f0; f2 = x[0] - f0; f3 = MUL_F((x[1] - x[5]), FRAC_CONST(0.70710678118655)); f4 = MUL_F(x[2], FRAC_CONST(0.86602540378444)) + MUL_F(x[4], FRAC_CONST(0.5)); f5 = f4 - x[4]; f6 = MUL_F(x[1], FRAC_CONST(0.96592582628907)) + MUL_F(x[5], FRAC_CONST(0.25881904510252)); f7 = f6 - f3; y[0] = f1 + f6 + f4; y[1] = f2 + f3 - x[4]; y[2] = f7 + f2 - f5; y[3] = f1 - f7 - f5; y[4] = f1 - f3 - x[4]; y[5] = f2 - f6 + f4; } /* complex filter, size 12 */ static void channel_filter12(hyb_info *hyb, uint8_t frame_len, const real_t *filter, qmf_t *buffer, qmf_t **X_hybrid) { uint8_t i, n; real_t input_re1[6], input_re2[6], input_im1[6], input_im2[6]; real_t out_re1[6], out_re2[6], out_im1[6], out_im2[6]; for (i = 0; i < frame_len; i++) { for (n = 0; n < 6; n++) { if (n == 0) { input_re1[0] = MUL_F(QMF_RE(buffer[6+i]), filter[6]); input_re2[0] = MUL_F(QMF_IM(buffer[6+i]), filter[6]); } else { input_re1[6-n] = MUL_F((QMF_RE(buffer[n+i]) + QMF_RE(buffer[12-n+i])), filter[n]); input_re2[6-n] = MUL_F((QMF_IM(buffer[n+i]) + QMF_IM(buffer[12-n+i])), filter[n]); } input_im2[n] = MUL_F((QMF_RE(buffer[n+i]) - QMF_RE(buffer[12-n+i])), filter[n]); input_im1[n] = MUL_F((QMF_IM(buffer[n+i]) - QMF_IM(buffer[12-n+i])), filter[n]); } DCT3_6_unscaled(out_re1, input_re1); DCT3_6_unscaled(out_re2, input_re2); DCT3_6_unscaled(out_im1, input_im1); DCT3_6_unscaled(out_im2, input_im2); for (n = 0; n < 6; n += 2) { QMF_RE(X_hybrid[i][n]) = out_re1[n] - out_im1[n]; QMF_IM(X_hybrid[i][n]) = out_re2[n] + out_im2[n]; QMF_RE(X_hybrid[i][n+1]) = out_re1[n+1] + out_im1[n+1]; QMF_IM(X_hybrid[i][n+1]) = out_re2[n+1] - out_im2[n+1]; QMF_RE(X_hybrid[i][10-n]) = out_re1[n+1] - out_im1[n+1]; QMF_IM(X_hybrid[i][10-n]) = out_re2[n+1] + out_im2[n+1]; QMF_RE(X_hybrid[i][11-n]) = out_re1[n] + out_im1[n]; QMF_IM(X_hybrid[i][11-n]) = out_re2[n] - out_im2[n]; } } } /* Hybrid analysis: further split up QMF subbands * to improve frequency resolution */ static void hybrid_analysis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32], uint8_t use34) { uint8_t k, n, band; uint8_t offset = 0; uint8_t qmf_bands = (use34) ? 5 : 3; uint8_t *resolution = (use34) ? hyb->resolution34 : hyb->resolution20; for (band = 0; band < qmf_bands; band++) { /* build working buffer */ memcpy(hyb->work, hyb->buffer[band], 12 * sizeof(qmf_t)); /* add new samples */ for (n = 0; n < hyb->frame_len; n++) { QMF_RE(hyb->work[12 + n]) = QMF_RE(X[n + 6 /*delay*/][band]); QMF_IM(hyb->work[12 + n]) = QMF_IM(X[n + 6 /*delay*/][band]); } /* store samples */ memcpy(hyb->buffer[band], hyb->work + hyb->frame_len, 12 * sizeof(qmf_t)); switch(resolution[band]) { case 2: /* Type B real filter, Q[p] = 2 */ channel_filter2(hyb, hyb->frame_len, p2_13_20, hyb->work, hyb->temp); break; case 4: /* Type A complex filter, Q[p] = 4 */ channel_filter4(hyb, hyb->frame_len, p4_13_34, hyb->work, hyb->temp); break; case 8: /* Type A complex filter, Q[p] = 8 */ channel_filter8(hyb, hyb->frame_len, (use34) ? p8_13_34 : p8_13_20, hyb->work, hyb->temp); break; case 12: /* Type A complex filter, Q[p] = 12 */ channel_filter12(hyb, hyb->frame_len, p12_13_34, hyb->work, hyb->temp); break; } for (n = 0; n < hyb->frame_len; n++) { for (k = 0; k < resolution[band]; k++) { QMF_RE(X_hybrid[n][offset + k]) = QMF_RE(hyb->temp[n][k]); QMF_IM(X_hybrid[n][offset + k]) = QMF_IM(hyb->temp[n][k]); } } offset += resolution[band]; } /* group hybrid channels */ if (!use34) { for (n = 0; n < 32 /*30?*/; n++) { QMF_RE(X_hybrid[n][3]) += QMF_RE(X_hybrid[n][4]); QMF_IM(X_hybrid[n][3]) += QMF_IM(X_hybrid[n][4]); QMF_RE(X_hybrid[n][4]) = 0; QMF_IM(X_hybrid[n][4]) = 0; QMF_RE(X_hybrid[n][2]) += QMF_RE(X_hybrid[n][5]); QMF_IM(X_hybrid[n][2]) += QMF_IM(X_hybrid[n][5]); QMF_RE(X_hybrid[n][5]) = 0; QMF_IM(X_hybrid[n][5]) = 0; } } } static void hybrid_synthesis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32], uint8_t use34) { uint8_t k, n, band; uint8_t offset = 0; uint8_t qmf_bands = (use34) ? 5 : 3; uint8_t *resolution = (use34) ? hyb->resolution34 : hyb->resolution20; for(band = 0; band < qmf_bands; band++) { for (n = 0; n < hyb->frame_len; n++) { QMF_RE(X[n][band]) = 0; QMF_IM(X[n][band]) = 0; for (k = 0; k < resolution[band]; k++) { QMF_RE(X[n][band]) += QMF_RE(X_hybrid[n][offset + k]); QMF_IM(X[n][band]) += QMF_IM(X_hybrid[n][offset + k]); } } offset += resolution[band]; } } /* limits the value i to the range [min,max] */ static int8_t delta_clip(int8_t i, int8_t min, int8_t max) { if (i < min) return min; else if (i > max) return max; else return i; } //int iid = 0; /* delta decode array */ static void delta_decode(uint8_t enable, int8_t *index, int8_t *index_prev, uint8_t dt_flag, uint8_t nr_par, uint8_t stride, int8_t min_index, int8_t max_index) { int8_t i; if (enable == 1) { if (dt_flag == 0) { /* delta coded in frequency direction */ index[0] = 0 + index[0]; index[0] = delta_clip(index[0], min_index, max_index); for (i = 1; i < nr_par; i++) { index[i] = index[i-1] + index[i]; index[i] = delta_clip(index[i], min_index, max_index); } } else { /* delta coded in time direction */ for (i = 0; i < nr_par; i++) { //int8_t tmp2; //int8_t tmp = index[i]; //printf("%d %dn", index_prev[i*stride], index[i]); //printf("%dn", index[i]); index[i] = index_prev[i*stride] + index[i]; //tmp2 = index[i]; index[i] = delta_clip(index[i], min_index, max_index); //if (iid) //{ // if (index[i] == 7) // { // printf("%d %d %dn", index_prev[i*stride], tmp, tmp2); // } //} } } } else { /* set indices to zero */ for (i = 0; i < nr_par; i++) { index[i] = 0; } } /* coarse */ if (stride == 2) { for (i = (nr_par<<1)-1; i > 0; i--) { index[i] = index[i>>1]; } } } /* delta modulo decode array */ /* in: log2 value of the modulo value to allow using AND instead of MOD */ static void delta_modulo_decode(uint8_t enable, int8_t *index, int8_t *index_prev, uint8_t dt_flag, uint8_t nr_par, uint8_t stride, int8_t log2modulo) { int8_t i; if (enable == 1) { if (dt_flag == 0) { /* delta coded in frequency direction */ index[0] = 0 + index[0]; index[0] &= log2modulo; for (i = 1; i < nr_par; i++) { index[i] = index[i-1] + index[i]; index[i] &= log2modulo; } } else { /* delta coded in time direction */ for (i = 0; i < nr_par; i++) { index[i] = index_prev[i*stride] + index[i]; index[i] &= log2modulo; } } } else { /* set indices to zero */ for (i = 0; i < nr_par; i++) { index[i] = 0; } } /* coarse */ if (stride == 2) { index[0] = 0; for (i = (nr_par<<1)-1; i > 0; i--) { index[i] = index[i>>1]; } } } #ifdef PS_LOW_POWER static void map34indexto20(int8_t *index, uint8_t bins) { index[0] = (2*index[0]+index[1])/3; index[1] = (index[1]+2*index[2])/3; index[2] = (2*index[3]+index[4])/3; index[3] = (index[4]+2*index[5])/3; index[4] = (index[6]+index[7])/2; index[5] = (index[8]+index[9])/2; index[6] = index[10]; index[7] = index[11]; index[8] = (index[12]+index[13])/2; index[9] = (index[14]+index[15])/2; index[10] = index[16]; if (bins == 34) { index[11] = index[17]; index[12] = index[18]; index[13] = index[19]; index[14] = (index[20]+index[21])/2; index[15] = (index[22]+index[23])/2; index[16] = (index[24]+index[25])/2; index[17] = (index[26]+index[27])/2; index[18] = (index[28]+index[29]+index[30]+index[31])/4; index[19] = (index[32]+index[33])/2; } } #endif static void map20indexto34(int8_t *index, uint8_t bins) { index[0] = index[0]; index[1] = (index[0] + index[1])/2; index[2] = index[1]; index[3] = index[2]; index[4] = (index[2] + index[3])/2; index[5] = index[3]; index[6] = index[4]; index[7] = index[4]; index[8] = index[5]; index[9] = index[5]; index[10] = index[6]; index[11] = index[7]; index[12] = index[8]; index[13] = index[8]; index[14] = index[9]; index[15] = index[9]; index[16] = index[10]; if (bins == 34) { index[17] = index[11]; index[18] = index[12]; index[19] = index[13]; index[20] = index[14]; index[21] = index[14]; index[22] = index[15]; index[23] = index[15]; index[24] = index[16]; index[25] = index[16]; index[26] = index[17]; index[27] = index[17]; index[28] = index[18]; index[29] = index[18]; index[30] = index[18]; index[31] = index[18]; index[32] = index[19]; index[33] = index[19]; } } /* parse the bitstream data decoded in ps_data() */ static void ps_data_decode(ps_info *ps) { uint8_t env, bin; /* ps data not available, use data from previous frame */ if (ps->ps_data_available == 0) { ps->num_env = 0; } for (env = 0; env < ps->num_env; env++) { int8_t *iid_index_prev; int8_t *icc_index_prev; int8_t *ipd_index_prev; int8_t *opd_index_prev; int8_t num_iid_steps = (ps->iid_mode < 3) ? 7 : 15 /*fine quant*/; if (env == 0) { /* take last envelope from previous frame */ iid_index_prev = ps->iid_index_prev; icc_index_prev = ps->icc_index_prev; ipd_index_prev = ps->ipd_index_prev; opd_index_prev = ps->opd_index_prev; } else { /* take index values from previous envelope */ iid_index_prev = ps->iid_index[env - 1]; icc_index_prev = ps->icc_index[env - 1]; ipd_index_prev = ps->ipd_index[env - 1]; opd_index_prev = ps->opd_index[env - 1]; } // iid = 1; /* delta decode iid parameters */ delta_decode(ps->enable_iid, ps->iid_index[env], iid_index_prev, ps->iid_dt[env], ps->nr_iid_par, (ps->iid_mode == 0 || ps->iid_mode == 3) ? 2 : 1, -num_iid_steps, num_iid_steps); // iid = 0; /* delta decode icc parameters */ delta_decode(ps->enable_icc, ps->icc_index[env], icc_index_prev, ps->icc_dt[env], ps->nr_icc_par, (ps->icc_mode == 0 || ps->icc_mode == 3) ? 2 : 1, 0, 7); /* delta modulo decode ipd parameters */ delta_modulo_decode(ps->enable_ipdopd, ps->ipd_index[env], ipd_index_prev, ps->ipd_dt[env], ps->nr_ipdopd_par, 1, /*log2(8)*/ 3); /* delta modulo decode opd parameters */ delta_modulo_decode(ps->enable_ipdopd, ps->opd_index[env], opd_index_prev, ps->opd_dt[env], ps->nr_ipdopd_par, 1, /*log2(8)*/ 3); } /* handle error case */ if (ps->num_env == 0) { /* force to 1 */ ps->num_env = 1; if (ps->enable_iid) { for (bin = 0; bin < 34; bin++) ps->iid_index[0][bin] = ps->iid_index_prev[bin]; } else { for (bin = 0; bin < 34; bin++) ps->iid_index[0][bin] = 0; } if (ps->enable_icc) { for (bin = 0; bin < 34; bin++) ps->icc_index[0][bin] = ps->icc_index_prev[bin]; } else { for (bin = 0; bin < 34; bin++) ps->icc_index[0][bin] = 0; } if (ps->enable_ipdopd) { for (bin = 0; bin < 17; bin++) { ps->ipd_index[0][bin] = ps->ipd_index_prev[bin]; ps->opd_index[0][bin] = ps->opd_index_prev[bin]; } } else { for (bin = 0; bin < 17; bin++) { ps->ipd_index[0][bin] = 0; ps->opd_index[0][bin] = 0; } } } /* update previous indices */ for (bin = 0; bin < 34; bin++) ps->iid_index_prev[bin] = ps->iid_index[ps->num_env-1][bin]; for (bin = 0; bin < 34; bin++) ps->icc_index_prev[bin] = ps->icc_index[ps->num_env-1][bin]; for (bin = 0; bin < 17; bin++) { ps->ipd_index_prev[bin] = ps->ipd_index[ps->num_env-1][bin]; ps->opd_index_prev[bin] = ps->opd_index[ps->num_env-1][bin]; } ps->ps_data_available = 0; if (ps->frame_class == 0) { ps->border_position[0] = 0; for (env = 1; env < ps->num_env; env++) { ps->border_position[env] = (env * 32 /* 30 for 960? */) / ps->num_env; } ps->border_position[ps->num_env] = 32 /* 30 for 960? */; } else { ps->border_position[0] = 0; if (ps->border_position[ps->num_env] < 32 /* 30 for 960? */) { ps->num_env++; ps->border_position[ps->num_env] = 32 /* 30 for 960? */; for (bin = 0; bin < 34; bin++) { ps->iid_index[ps->num_env][bin] = ps->iid_index[ps->num_env-1][bin]; ps->icc_index[ps->num_env][bin] = ps->icc_index[ps->num_env-1][bin]; } for (bin = 0; bin < 17; bin++) { ps->ipd_index[ps->num_env][bin] = ps->ipd_index[ps->num_env-1][bin]; ps->opd_index[ps->num_env][bin] = ps->opd_index[ps->num_env-1][bin]; } } for (env = 1; env < ps->num_env; env++) { int8_t thr = 32 /* 30 for 960? */ - (ps->num_env - env); if (ps->border_position[env] > thr) { ps->border_position[env] = thr; } else { thr = ps->border_position[env-1]+1; if (ps->border_position[env] < thr) { ps->border_position[env] = thr; } } } } /* make sure that the indices of all parameters can be mapped * to the same hybrid synthesis filterbank */ #ifdef PS_LOW_POWER for (env = 0; env < ps->num_env; env++) { if (ps->iid_mode == 2 || ps->iid_mode == 5) map34indexto20(ps->iid_index[env], 34); if (ps->icc_mode == 2 || ps->icc_mode == 5) map34indexto20(ps->icc_index[env], 34); /* disable ipd/opd */ for (bin = 0; bin < 17; bin++) { ps->aaIpdIndex[env][bin] = 0; ps->aaOpdIndex[env][bin] = 0; } } #else if (ps->use34hybrid_bands) { for (env = 0; env < ps->num_env; env++) { if (ps->iid_mode != 2 && ps->iid_mode != 5) map20indexto34(ps->iid_index[env], 34); if (ps->icc_mode != 2 && ps->icc_mode != 5) map20indexto34(ps->icc_index[env], 34); if (ps->ipd_mode != 2 && ps->ipd_mode != 5) { map20indexto34(ps->ipd_index[env], 17); map20indexto34(ps->opd_index[env], 17); } } } #endif #if 0 for (env = 0; env < ps->num_env; env++) { printf("iid[env:%d]:", env); for (bin = 0; bin < 34; bin++) { printf(" %d", ps->iid_index[env][bin]); } printf("n"); } for (env = 0; env < ps->num_env; env++) { printf("icc[env:%d]:", env); for (bin = 0; bin < 34; bin++) { printf(" %d", ps->icc_index[env][bin]); } printf("n"); } for (env = 0; env < ps->num_env; env++) { printf("ipd[env:%d]:", env); for (bin = 0; bin < 17; bin++) { printf(" %d", ps->ipd_index[env][bin]); } printf("n"); } for (env = 0; env < ps->num_env; env++) { printf("opd[env:%d]:", env); for (bin = 0; bin < 17; bin++) { printf(" %d", ps->opd_index[env][bin]); } printf("n"); } printf("n"); #endif } /* decorrelate the mono signal using an allpass filter */ static void ps_decorrelate(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64], qmf_t X_hybrid_left[32][32], qmf_t X_hybrid_right[32][32]) { uint8_t gr, n, m, bk; uint8_t temp_delay; uint8_t sb, maxsb; const complex_t *Phi_Fract_SubQmf; uint8_t temp_delay_ser[NO_ALLPASS_LINKS]; real_t P_SmoothPeakDecayDiffNrg, nrg; real_t P[32][34]; real_t G_TransientRatio[32][34] = {{0}}; complex_t inputLeft; /* chose hybrid filterbank: 20 or 34 band case */ if (ps->use34hybrid_bands) { Phi_Fract_SubQmf = Phi_Fract_SubQmf34; } else{ Phi_Fract_SubQmf = Phi_Fract_SubQmf20; } /* clear the energy values */ for (n = 0; n < 32; n++) { for (bk = 0; bk < 34; bk++) { P[n][bk] = 0; } } /* calculate the energy in each parameter band b(k) */ for (gr = 0; gr < ps->num_groups; gr++) { /* select the parameter index b(k) to which this group belongs */ bk = (~NEGATE_IPD_MASK) & ps->map_group2bk[gr]; /* select the upper subband border for this group */ maxsb = (gr < ps->num_hybrid_groups) ? ps->group_border[gr]+1 : ps->group_border[gr+1]; for (sb = ps->group_border[gr]; sb < maxsb; sb++) { for (n = ps->border_position[0]; n < ps->border_position[ps->num_env]; n++) { #ifdef FIXED_POINT uint32_t in_re, in_im; #endif /* input from hybrid subbands or QMF subbands */ if (gr < ps->num_hybrid_groups) { RE(inputLeft) = QMF_RE(X_hybrid_left[n][sb]); IM(inputLeft) = QMF_IM(X_hybrid_left[n][sb]); } else { RE(inputLeft) = QMF_RE(X_left[n][sb]); IM(inputLeft) = QMF_IM(X_left[n][sb]); } /* accumulate energy */ #ifdef FIXED_POINT /* NOTE: all input is scaled by 2^(-5) because of fixed point QMF * meaning that P will be scaled by 2^(-10) compared to floating point version */ in_re = ((abs(RE(inputLeft))+(1<<(REAL_BITS-1)))>>REAL_BITS); in_im = ((abs(IM(inputLeft))+(1<<(REAL_BITS-1)))>>REAL_BITS); P[n][bk] += in_re*in_re + in_im*in_im; #else P[n][bk] += MUL_R(RE(inputLeft),RE(inputLeft)) + MUL_R(IM(inputLeft),IM(inputLeft)); #endif } } } #if 0 for (n = 0; n < 32; n++) { for (bk = 0; bk < 34; bk++) { #ifdef FIXED_POINT printf("%d %d: %dn", n, bk, P[n][bk] /*/(float)REAL_PRECISION*/); #else printf("%d %d: %fn", n, bk, P[n][bk]/1024.0); #endif } } #endif /* calculate transient reduction ratio for each parameter band b(k) */ for (bk = 0; bk < ps->nr_par_bands; bk++) { for (n = ps->border_position[0]; n < ps->border_position[ps->num_env]; n++) { const real_t gamma = COEF_CONST(1.5); ps->P_PeakDecayNrg[bk] = MUL_F(ps->P_PeakDecayNrg[bk], ps->alpha_decay); if (ps->P_PeakDecayNrg[bk] < P[n][bk]) ps->P_PeakDecayNrg[bk] = P[n][bk]; /* apply smoothing filter to peak decay energy */ P_SmoothPeakDecayDiffNrg = ps->P_SmoothPeakDecayDiffNrg_prev[bk]; P_SmoothPeakDecayDiffNrg += MUL_F((ps->P_PeakDecayNrg[bk] - P[n][bk] - ps->P_SmoothPeakDecayDiffNrg_prev[bk]), ps->alpha_smooth); ps->P_SmoothPeakDecayDiffNrg_prev[bk] = P_SmoothPeakDecayDiffNrg; /* apply smoothing filter to energy */ nrg = ps->P_prev[bk]; nrg += MUL_F((P[n][bk] - ps->P_prev[bk]), ps->alpha_smooth); ps->P_prev[bk] = nrg; /* calculate transient ratio */ if (MUL_C(P_SmoothPeakDecayDiffNrg, gamma) <= nrg) { G_TransientRatio[n][bk] = REAL_CONST(1.0); } else { G_TransientRatio[n][bk] = DIV_R(nrg, (MUL_C(P_SmoothPeakDecayDiffNrg, gamma))); } } } #if 0 for (n = 0; n < 32; n++) { for (bk = 0; bk < 34; bk++) { #ifdef FIXED_POINT printf("%d %d: %fn", n, bk, G_TransientRatio[n][bk]/(float)REAL_PRECISION); #else printf("%d %d: %fn", n, bk, G_TransientRatio[n][bk]); #endif } } #endif /* apply stereo decorrelation filter to the signal */ for (gr = 0; gr < ps->num_groups; gr++) { if (gr < ps->num_hybrid_groups) maxsb = ps->group_border[gr] + 1; else maxsb = ps->group_border[gr + 1]; /* QMF channel */ for (sb = ps->group_border[gr]; sb < maxsb; sb++) { real_t g_DecaySlope; real_t g_DecaySlope_filt[NO_ALLPASS_LINKS]; /* g_DecaySlope: [0..1] */ if (gr < ps->num_hybrid_groups || sb <= ps->decay_cutoff) { g_DecaySlope = FRAC_CONST(1.0); } else { int8_t decay = ps->decay_cutoff - sb; if (decay <= -20 /* -1/DECAY_SLOPE */) { g_DecaySlope = 0; } else { /* decay(int)*decay_slope(frac) = g_DecaySlope(frac) */ g_DecaySlope = FRAC_CONST(1.0) + DECAY_SLOPE * decay; } } /* calculate g_DecaySlope_filt for every m multiplied by filter_a[m] */ for (m = 0; m < NO_ALLPASS_LINKS; m++) { g_DecaySlope_filt[m] = MUL_F(g_DecaySlope, filter_a[m]); } /* set delay indices */ temp_delay = ps->saved_delay; for (n = 0; n < NO_ALLPASS_LINKS; n++) temp_delay_ser[n] = ps->delay_buf_index_ser[n]; for (n = ps->border_position[0]; n < ps->border_position[ps->num_env]; n++) { complex_t tmp, tmp0, R0; if (gr < ps->num_hybrid_groups) { /* hybrid filterbank input */ RE(inputLeft) = QMF_RE(X_hybrid_left[n][sb]); IM(inputLeft) = QMF_IM(X_hybrid_left[n][sb]); } else { /* QMF filterbank input */ RE(inputLeft) = QMF_RE(X_left[n][sb]); IM(inputLeft) = QMF_IM(X_left[n][sb]); } if (sb > ps->nr_allpass_bands && gr >= ps->num_hybrid_groups) { /* delay */ /* never hybrid subbands here, always QMF subbands */ RE(tmp) = RE(ps->delay_Qmf[ps->delay_buf_index_delay[sb]][sb]); IM(tmp) = IM(ps->delay_Qmf[ps->delay_buf_index_delay[sb]][sb]); RE(R0) = RE(tmp); IM(R0) = IM(tmp); RE(ps->delay_Qmf[ps->delay_buf_index_delay[sb]][sb]) = RE(inputLeft); IM(ps->delay_Qmf[ps->delay_buf_index_delay[sb]][sb]) = IM(inputLeft); } else { /* allpass filter */ uint8_t m; complex_t Phi_Fract; /* fetch parameters */ if (gr < ps->num_hybrid_groups) { /* select data from the hybrid subbands */ RE(tmp0) = RE(ps->delay_SubQmf[temp_delay][sb]); IM(tmp0) = IM(ps->delay_SubQmf[temp_delay][sb]); RE(ps->delay_SubQmf[temp_delay][sb]) = RE(inputLeft); IM(ps->delay_SubQmf[temp_delay][sb]) = IM(inputLeft); RE(Phi_Fract) = RE(Phi_Fract_SubQmf[sb]); IM(Phi_Fract) = IM(Phi_Fract_SubQmf[sb]); } else { /* select data from the QMF subbands */ RE(tmp0) = RE(ps->delay_Qmf[temp_delay][sb]); IM(tmp0) = IM(ps->delay_Qmf[temp_delay][sb]); RE(ps->delay_Qmf[temp_delay][sb]) = RE(inputLeft); IM(ps->delay_Qmf[temp_delay][sb]) = IM(inputLeft); RE(Phi_Fract) = RE(Phi_Fract_Qmf[sb]); IM(Phi_Fract) = IM(Phi_Fract_Qmf[sb]); } /* z^(-2) * Phi_Fract[k] */ ComplexMult(&RE(tmp), &IM(tmp), RE(tmp0), IM(tmp0), RE(Phi_Fract), IM(Phi_Fract)); RE(R0) = RE(tmp); IM(R0) = IM(tmp); for (m = 0; m < NO_ALLPASS_LINKS; m++) { complex_t Q_Fract_allpass, tmp2; /* fetch parameters */ if (gr < ps->num_hybrid_groups) { /* select data from the hybrid subbands */ RE(tmp0) = RE(ps->delay_SubQmf_ser[m][temp_delay_ser[m]][sb]); IM(tmp0) = IM(ps->delay_SubQmf_ser[m][temp_delay_ser[m]][sb]); if (ps->use34hybrid_bands) { RE(Q_Fract_allpass) = RE(Q_Fract_allpass_SubQmf34[sb][m]); IM(Q_Fract_allpass) = IM(Q_Fract_allpass_SubQmf34[sb][m]); } else { RE(Q_Fract_allpass) = RE(Q_Fract_allpass_SubQmf20[sb][m]); IM(Q_Fract_allpass) = IM(Q_Fract_allpass_SubQmf20[sb][m]); } } else { /* select data from the QMF subbands */ RE(tmp0) = RE(ps->delay_Qmf_ser[m][temp_delay_ser[m]][sb]); IM(tmp0) = IM(ps->delay_Qmf_ser[m][temp_delay_ser[m]][sb]); RE(Q_Fract_allpass) = RE(Q_Fract_allpass_Qmf[sb][m]); IM(Q_Fract_allpass) = IM(Q_Fract_allpass_Qmf[sb][m]); } /* delay by a fraction */ /* z^(-d(m)) * Q_Fract_allpass[k,m] */ ComplexMult(&RE(tmp), &IM(tmp), RE(tmp0), IM(tmp0), RE(Q_Fract_allpass), IM(Q_Fract_allpass)); /* -a(m) * g_DecaySlope[k] */ RE(tmp) += -MUL_F(g_DecaySlope_filt[m], RE(R0)); IM(tmp) += -MUL_F(g_DecaySlope_filt[m], IM(R0)); /* -a(m) * g_DecaySlope[k] * Q_Fract_allpass[k,m] * z^(-d(m)) */ RE(tmp2) = RE(R0) + MUL_F(g_DecaySlope_filt[m], RE(tmp)); IM(tmp2) = IM(R0) + MUL_F(g_DecaySlope_filt[m], IM(tmp)); /* store sample */ if (gr < ps->num_hybrid_groups) { RE(ps->delay_SubQmf_ser[m][temp_delay_ser[m]][sb]) = RE(tmp2); IM(ps->delay_SubQmf_ser[m][temp_delay_ser[m]][sb]) = IM(tmp2); } else { RE(ps->delay_Qmf_ser[m][temp_delay_ser[m]][sb]) = RE(tmp2); IM(ps->delay_Qmf_ser[m][temp_delay_ser[m]][sb]) = IM(tmp2); } /* store for next iteration (or as output value if last iteration) */ RE(R0) = RE(tmp); IM(R0) = IM(tmp); } } /* select b(k) for reading the transient ratio */ bk = (~NEGATE_IPD_MASK) & ps->map_group2bk[gr]; /* duck if a past transient is found */ RE(R0) = MUL_R(G_TransientRatio[n][bk], RE(R0)); IM(R0) = MUL_R(G_TransientRatio[n][bk], IM(R0)); if (gr < ps->num_hybrid_groups) { /* hybrid */ QMF_RE(X_hybrid_right[n][sb]) = RE(R0); QMF_IM(X_hybrid_right[n][sb]) = IM(R0); } else { /* QMF */ QMF_RE(X_right[n][sb]) = RE(R0); QMF_IM(X_right[n][sb]) = IM(R0); } /* Update delay buffer index */ if (++temp_delay >= 2) { temp_delay = 0; } /* update delay indices */ if (sb > ps->nr_allpass_bands && gr >= ps->num_hybrid_groups) { /* delay_D depends on the samplerate, it can hold the values 14 and 1 */ if (++ps->delay_buf_index_delay[sb] >= ps->delay_D[sb]) { ps->delay_buf_index_delay[sb] = 0; } } for (m = 0; m < NO_ALLPASS_LINKS; m++) { if (++temp_delay_ser[m] >= ps->num_sample_delay_ser[m]) { temp_delay_ser[m] = 0; } } } } } /* update delay indices */ ps->saved_delay = temp_delay; for (m = 0; m < NO_ALLPASS_LINKS; m++) ps->delay_buf_index_ser[m] = temp_delay_ser[m]; } #ifdef FIXED_POINT #define step(shift) if ((0x40000000l >> shift) + root <= value) { value -= (0x40000000l >> shift) + root; root = (root >> 1) | (0x40000000l >> shift); } else { root = root >> 1; } /* fixed point square root approximation */ static real_t ps_sqrt(real_t value) { real_t root = 0; step( 0); step( 2); step( 4); step( 6); step( 8); step(10); step(12); step(14); step(16); step(18); step(20); step(22); step(24); step(26); step(28); step(30); if (root < value) ++root; root <<= (REAL_BITS/2); return root; } #else #define ps_sqrt(A) sqrt(A) #endif static const real_t ipdopd_cos_tab[] = { FRAC_CONST(1.000000000000000), FRAC_CONST(0.707106781186548), FRAC_CONST(0.000000000000000), FRAC_CONST(-0.707106781186547), FRAC_CONST(-1.000000000000000), FRAC_CONST(-0.707106781186548), FRAC_CONST(-0.000000000000000), FRAC_CONST(0.707106781186547), FRAC_CONST(1.000000000000000) }; static const real_t ipdopd_sin_tab[] = { FRAC_CONST(0.000000000000000), FRAC_CONST(0.707106781186547), FRAC_CONST(1.000000000000000), FRAC_CONST(0.707106781186548), FRAC_CONST(0.000000000000000), FRAC_CONST(-0.707106781186547), FRAC_CONST(-1.000000000000000), FRAC_CONST(-0.707106781186548), FRAC_CONST(-0.000000000000000) }; static void ps_mix_phase(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64], qmf_t X_hybrid_left[32][32], qmf_t X_hybrid_right[32][32]) { uint8_t n; uint8_t gr; uint8_t bk = 0; uint8_t sb, maxsb; uint8_t env; uint8_t nr_ipdopd_par; complex_t h11, h12, h21, h22; complex_t H11, H12, H21, H22; complex_t deltaH11, deltaH12, deltaH21, deltaH22; complex_t tempLeft; complex_t tempRight; complex_t phaseLeft; complex_t phaseRight; real_t L; const real_t *sf_iid; uint8_t no_iid_steps; if (ps->iid_mode >= 3) { no_iid_steps = 15; sf_iid = sf_iid_fine; } else { no_iid_steps = 7; sf_iid = sf_iid_normal; } if (ps->ipd_mode == 0 || ps->ipd_mode == 3) { nr_ipdopd_par = 11; /* resolution */ } else { nr_ipdopd_par = ps->nr_ipdopd_par; } for (gr = 0; gr < ps->num_groups; gr++) { bk = (~NEGATE_IPD_MASK) & ps->map_group2bk[gr]; /* use one channel per group in the subqmf domain */ maxsb = (gr < ps->num_hybrid_groups) ? ps->group_border[gr] + 1 : ps->group_border[gr + 1]; for (env = 0; env < ps->num_env; env++) { if (ps->icc_mode < 3) { /* type 'A' mixing as described in 8.6.4.6.2.1 */ real_t c_1, c_2; real_t cosa, sina; real_t cosb, sinb; real_t ab1, ab2; real_t ab3, ab4; /* c_1 = sqrt(2.0 / (1.0 + pow(10.0, quant_iid[no_iid_steps + iid_index] / 10.0))); c_2 = sqrt(2.0 / (1.0 + pow(10.0, quant_iid[no_iid_steps - iid_index] / 10.0))); alpha = 0.5 * acos(quant_rho[icc_index]); beta = alpha * ( c_1 - c_2 ) / sqrt(2.0); */ //printf("%dn", ps->iid_index[env][bk]); /* calculate the scalefactors c_1 and c_2 from the intensity differences */ c_1 = sf_iid[no_iid_steps + ps->iid_index[env][bk]]; c_2 = sf_iid[no_iid_steps - ps->iid_index[env][bk]]; /* calculate alpha and beta using the ICC parameters */ cosa = cos_alphas[ps->icc_index[env][bk]]; sina = sin_alphas[ps->icc_index[env][bk]]; if (ps->iid_mode >= 3) { if (ps->iid_index[env][bk] < 0) { cosb = cos_betas_fine[-ps->iid_index[env][bk]][ps->icc_index[env][bk]]; sinb = -sin_betas_fine[-ps->iid_index[env][bk]][ps->icc_index[env][bk]]; } else { cosb = cos_betas_fine[ps->iid_index[env][bk]][ps->icc_index[env][bk]]; sinb = sin_betas_fine[ps->iid_index[env][bk]][ps->icc_index[env][bk]]; } } else { if (ps->iid_index[env][bk] < 0) { cosb = cos_betas_normal[-ps->iid_index[env][bk]][ps->icc_index[env][bk]]; sinb = -sin_betas_normal[-ps->iid_index[env][bk]][ps->icc_index[env][bk]]; } else { cosb = cos_betas_normal[ps->iid_index[env][bk]][ps->icc_index[env][bk]]; sinb = sin_betas_normal[ps->iid_index[env][bk]][ps->icc_index[env][bk]]; } } ab1 = MUL_C(cosb, cosa); ab2 = MUL_C(sinb, sina); ab3 = MUL_C(sinb, cosa); ab4 = MUL_C(cosb, sina); /* h_xy: COEF */ RE(h11) = MUL_C(c_2, (ab1 - ab2)); RE(h12) = MUL_C(c_1, (ab1 + ab2)); RE(h21) = MUL_C(c_2, (ab3 + ab4)); RE(h22) = MUL_C(c_1, (ab3 - ab4)); } else { /* type 'B' mixing as described in 8.6.4.6.2.2 */ real_t sina, cosa; real_t cosg, sing; /* real_t c, rho, mu, alpha, gamma; uint8_t i; i = ps->iid_index[env][bk]; c = (real_t)pow(10.0, ((i)?(((i>0)?1:-1)*quant_iid[((i>0)?i:-i)-1]):0.)/20.0); rho = quant_rho[ps->icc_index[env][bk]]; if (rho == 0.0f && c == 1.) { alpha = (real_t)M_PI/4.0f; rho = 0.05f; } else { if (rho <= 0.05f) { rho = 0.05f; } alpha = 0.5f*(real_t)atan( (2.0f*c*rho) / (c*c-1.0f) ); if (alpha < 0.) { alpha += (real_t)M_PI/2.0f; } if (rho < 0.) { alpha += (real_t)M_PI; } } mu = c+1.0f/c; mu = 1+(4.0f*rho*rho-4.0f)/(mu*mu); gamma = (real_t)atan(sqrt((1.0f-sqrt(mu))/(1.0f+sqrt(mu)))); */ if (ps->iid_mode >= 3) { uint8_t abs_iid = abs(ps->iid_index[env][bk]); cosa = sincos_alphas_B_fine[no_iid_steps + ps->iid_index[env][bk]][ps->icc_index[env][bk]]; sina = sincos_alphas_B_fine[30 - (no_iid_steps + ps->iid_index[env][bk])][ps->icc_index[env][bk]]; cosg = cos_gammas_fine[abs_iid][ps->icc_index[env][bk]]; sing = sin_gammas_fine[abs_iid][ps->icc_index[env][bk]]; } else { uint8_t abs_iid = abs(ps->iid_index[env][bk]); cosa = sincos_alphas_B_normal[no_iid_steps + ps->iid_index[env][bk]][ps->icc_index[env][bk]]; sina = sincos_alphas_B_normal[14 - (no_iid_steps + ps->iid_index[env][bk])][ps->icc_index[env][bk]]; cosg = cos_gammas_normal[abs_iid][ps->icc_index[env][bk]]; sing = sin_gammas_normal[abs_iid][ps->icc_index[env][bk]]; } RE(h11) = MUL_C(COEF_SQRT2, MUL_C(cosa, cosg)); RE(h12) = MUL_C(COEF_SQRT2, MUL_C(sina, cosg)); RE(h21) = MUL_C(COEF_SQRT2, MUL_C(-cosa, sing)); RE(h22) = MUL_C(COEF_SQRT2, MUL_C(sina, sing)); } /* calculate phase rotation parameters H_xy */ /* note that the imaginary part of these parameters are only calculated when IPD and OPD are enabled */ if ((ps->enable_ipdopd) && (bk < nr_ipdopd_par)) { int8_t i; real_t xxyy, ppqq; real_t yq, xp, xq, py, tmp; /* ringbuffer index */ i = ps->phase_hist; /* previous value */ #ifdef FIXED_POINT /* divide by 4, shift right 2 bits */ RE(tempLeft) = RE(ps->ipd_prev[bk][i]) >> 2; IM(tempLeft) = IM(ps->ipd_prev[bk][i]) >> 2; RE(tempRight) = RE(ps->opd_prev[bk][i]) >> 2; IM(tempRight) = IM(ps->opd_prev[bk][i]) >> 2; #else RE(tempLeft) = MUL_F(RE(ps->ipd_prev[bk][i]), FRAC_CONST(0.25)); IM(tempLeft) = MUL_F(IM(ps->ipd_prev[bk][i]), FRAC_CONST(0.25)); RE(tempRight) = MUL_F(RE(ps->opd_prev[bk][i]), FRAC_CONST(0.25)); IM(tempRight) = MUL_F(IM(ps->opd_prev[bk][i]), FRAC_CONST(0.25)); #endif /* save current value */ RE(ps->ipd_prev[bk][i]) = ipdopd_cos_tab[abs(ps->ipd_index[env][bk])]; IM(ps->ipd_prev[bk][i]) = ipdopd_sin_tab[abs(ps->ipd_index[env][bk])]; RE(ps->opd_prev[bk][i]) = ipdopd_cos_tab[abs(ps->opd_index[env][bk])]; IM(ps->opd_prev[bk][i]) = ipdopd_sin_tab[abs(ps->opd_index[env][bk])]; /* add current value */ RE(tempLeft) += RE(ps->ipd_prev[bk][i]); IM(tempLeft) += IM(ps->ipd_prev[bk][i]); RE(tempRight) += RE(ps->opd_prev[bk][i]); IM(tempRight) += IM(ps->opd_prev[bk][i]); /* ringbuffer index */ if (i == 0) { i = 2; } i--; /* get value before previous */ #ifdef FIXED_POINT /* dividing by 2, shift right 1 bit */ RE(tempLeft) += (RE(ps->ipd_prev[bk][i]) >> 1); IM(tempLeft) += (IM(ps->ipd_prev[bk][i]) >> 1); RE(tempRight) += (RE(ps->opd_prev[bk][i]) >> 1); IM(tempRight) += (IM(ps->opd_prev[bk][i]) >> 1); #else RE(tempLeft) += MUL_F(RE(ps->ipd_prev[bk][i]), FRAC_CONST(0.5)); IM(tempLeft) += MUL_F(IM(ps->ipd_prev[bk][i]), FRAC_CONST(0.5)); RE(tempRight) += MUL_F(RE(ps->opd_prev[bk][i]), FRAC_CONST(0.5)); IM(tempRight) += MUL_F(IM(ps->opd_prev[bk][i]), FRAC_CONST(0.5)); #endif #if 0 /* original code */ ipd = (float)atan2(IM(tempLeft), RE(tempLeft)); opd = (float)atan2(IM(tempRight), RE(tempRight)); /* phase rotation */ RE(phaseLeft) = (float)cos(opd); IM(phaseLeft) = (float)sin(opd); opd -= ipd; RE(phaseRight) = (float)cos(opd); IM(phaseRight) = (float)sin(opd); #else // x = IM(tempLeft) // y = RE(tempLeft) // p = IM(tempRight) // q = RE(tempRight) // cos(atan2(x,y)) = 1/sqrt(1 + (x*x)/(y*y)) // sin(atan2(x,y)) = x/(y*sqrt(1 + (x*x)/(y*y))) // cos(atan2(x,y)-atan2(p,q)) = (y*q+x*p)/(y*q * sqrt(1 + (x*x)/(y*y)) * sqrt(1 + (p*p)/(q*q))); // sin(atan2(x,y)-atan2(p,q)) = (x*q-p*y)/(y*q * sqrt(1 + (x*x)/(y*y)) * sqrt(1 + (p*p)/(q*q))); /* (x*x)/(y*y) (REAL > 0) */ xxyy = DIV_R(MUL_C(IM(tempLeft),IM(tempLeft)), MUL_C(RE(tempLeft),RE(tempLeft))); ppqq = DIV_R(MUL_C(IM(tempRight),IM(tempRight)), MUL_C(RE(tempRight),RE(tempRight))); /* 1 + (x*x)/(y*y) (REAL > 1) */ xxyy += REAL_CONST(1); ppqq += REAL_CONST(1); /* 1 / sqrt(1 + (x*x)/(y*y)) (FRAC <= 1) */ xxyy = DIV_R(FRAC_CONST(1), ps_sqrt(xxyy)); ppqq = DIV_R(FRAC_CONST(1), ps_sqrt(ppqq)); /* COEF */ yq = MUL_C(RE(tempLeft), RE(tempRight)); xp = MUL_C(IM(tempLeft), IM(tempRight)); xq = MUL_C(IM(tempLeft), RE(tempRight)); py = MUL_C(RE(tempLeft), IM(tempRight)); RE(phaseLeft) = xxyy; IM(phaseLeft) = MUL_R(xxyy, (DIV_R(IM(tempLeft), RE(tempLeft)))); tmp = DIV_C(MUL_F(xxyy, ppqq), yq); /* MUL_C(FRAC,COEF) = FRAC */ RE(phaseRight) = MUL_C(tmp, (yq+xp)); IM(phaseRight) = MUL_C(tmp, (xq-py)); #endif /* MUL_F(COEF, FRAC) = COEF */ IM(h11) = MUL_F(RE(h11), IM(phaseLeft)); IM(h12) = MUL_F(RE(h12), IM(phaseRight)); IM(h21) = MUL_F(RE(h21), IM(phaseLeft)); IM(h22) = MUL_F(RE(h22), IM(phaseRight)); RE(h11) = MUL_F(RE(h11), RE(phaseLeft)); RE(h12) = MUL_F(RE(h12), RE(phaseRight)); RE(h21) = MUL_F(RE(h21), RE(phaseLeft)); RE(h22) = MUL_F(RE(h22), RE(phaseRight)); } /* length of the envelope n_e+1 - n_e (in time samples) */ /* 0 < L <= 32: integer */ L = (real_t)(ps->border_position[env + 1] - ps->border_position[env]); /* obtain final H_xy by means of linear interpolation */ RE(deltaH11) = (RE(h11) - RE(ps->h11_prev[gr])) / L; RE(deltaH12) = (RE(h12) - RE(ps->h12_prev[gr])) / L; RE(deltaH21) = (RE(h21) - RE(ps->h21_prev[gr])) / L; RE(deltaH22) = (RE(h22) - RE(ps->h22_prev[gr])) / L; RE(H11) = RE(ps->h11_prev[gr]); RE(H12) = RE(ps->h12_prev[gr]); RE(H21) = RE(ps->h21_prev[gr]); RE(H22) = RE(ps->h22_prev[gr]); RE(ps->h11_prev[gr]) = RE(h11); RE(ps->h12_prev[gr]) = RE(h12); RE(ps->h21_prev[gr]) = RE(h21); RE(ps->h22_prev[gr]) = RE(h22); /* only calculate imaginary part when needed */ if ((ps->enable_ipdopd) && (bk < nr_ipdopd_par)) { /* obtain final H_xy by means of linear interpolation */ IM(deltaH11) = (IM(h11) - IM(ps->h11_prev[gr])) / L; IM(deltaH12) = (IM(h12) - IM(ps->h12_prev[gr])) / L; IM(deltaH21) = (IM(h21) - IM(ps->h21_prev[gr])) / L; IM(deltaH22) = (IM(h22) - IM(ps->h22_prev[gr])) / L; IM(H11) = IM(ps->h11_prev[gr]); IM(H12) = IM(ps->h12_prev[gr]); IM(H21) = IM(ps->h21_prev[gr]); IM(H22) = IM(ps->h22_prev[gr]); if ((NEGATE_IPD_MASK & ps->map_group2bk[gr]) != 0) { IM(deltaH11) = -IM(deltaH11); IM(deltaH12) = -IM(deltaH12); IM(deltaH21) = -IM(deltaH21); IM(deltaH22) = -IM(deltaH22); IM(H11) = -IM(H11); IM(H12) = -IM(H12); IM(H21) = -IM(H21); IM(H22) = -IM(H22); } IM(ps->h11_prev[gr]) = IM(h11); IM(ps->h12_prev[gr]) = IM(h12); IM(ps->h21_prev[gr]) = IM(h21); IM(ps->h22_prev[gr]) = IM(h22); } /* apply H_xy to the current envelope band of the decorrelated subband */ for (n = ps->border_position[env]; n < ps->border_position[env + 1]; n++) { /* addition finalises the interpolation over every n */ RE(H11) += RE(deltaH11); RE(H12) += RE(deltaH12); RE(H21) += RE(deltaH21); RE(H22) += RE(deltaH22); if ((ps->enable_ipdopd) && (bk < nr_ipdopd_par)) { IM(H11) += IM(deltaH11); IM(H12) += IM(deltaH12); IM(H21) += IM(deltaH21); IM(H22) += IM(deltaH22); } /* channel is an alias to the subband */ for (sb = ps->group_border[gr]; sb < maxsb; sb++) { complex_t inLeft, inRight; /* load decorrelated samples */ if (gr < ps->num_hybrid_groups) { RE(inLeft) = RE(X_hybrid_left[n][sb]); IM(inLeft) = IM(X_hybrid_left[n][sb]); RE(inRight) = RE(X_hybrid_right[n][sb]); IM(inRight) = IM(X_hybrid_right[n][sb]); } else { RE(inLeft) = RE(X_left[n][sb]); IM(inLeft) = IM(X_left[n][sb]); RE(inRight) = RE(X_right[n][sb]); IM(inRight) = IM(X_right[n][sb]); } /* apply mixing */ RE(tempLeft) = MUL_C(RE(H11), RE(inLeft)) + MUL_C(RE(H21), RE(inRight)); IM(tempLeft) = MUL_C(RE(H11), IM(inLeft)) + MUL_C(RE(H21), IM(inRight)); RE(tempRight) = MUL_C(RE(H12), RE(inLeft)) + MUL_C(RE(H22), RE(inRight)); IM(tempRight) = MUL_C(RE(H12), IM(inLeft)) + MUL_C(RE(H22), IM(inRight)); /* only perform imaginary operations when needed */ if ((ps->enable_ipdopd) && (bk < nr_ipdopd_par)) { /* apply rotation */ RE(tempLeft) -= MUL_C(IM(H11), IM(inLeft)) + MUL_C(IM(H21), IM(inRight)); IM(tempLeft) += MUL_C(IM(H11), RE(inLeft)) + MUL_C(IM(H21), RE(inRight)); RE(tempRight) -= MUL_C(IM(H12), IM(inLeft)) + MUL_C(IM(H22), IM(inRight)); IM(tempRight) += MUL_C(IM(H12), RE(inLeft)) + MUL_C(IM(H22), RE(inRight)); } /* store final samples */ if (gr < ps->num_hybrid_groups) { RE(X_hybrid_left[n][sb]) = RE(tempLeft); IM(X_hybrid_left[n][sb]) = IM(tempLeft); RE(X_hybrid_right[n][sb]) = RE(tempRight); IM(X_hybrid_right[n][sb]) = IM(tempRight); } else { RE(X_left[n][sb]) = RE(tempLeft); IM(X_left[n][sb]) = IM(tempLeft); RE(X_right[n][sb]) = RE(tempRight); IM(X_right[n][sb]) = IM(tempRight); } } } /* shift phase smoother's circular buffer index */ ps->phase_hist++; if (ps->phase_hist == 2) { ps->phase_hist = 0; } } } } void ps_free(ps_info *ps) { /* free hybrid filterbank structures */ hybrid_free(ps->hyb); faad_free(ps); } ps_info *ps_init(uint8_t sr_index) { uint8_t i; uint8_t short_delay_band; ps_info *ps = (ps_info*)faad_malloc(sizeof(ps_info)); memset(ps, 0, sizeof(ps_info)); ps->hyb = hybrid_init(); ps->ps_data_available = 0; /* delay stuff*/ ps->saved_delay = 0; for (i = 0; i < 64; i++) { ps->delay_buf_index_delay[i] = 0; } for (i = 0; i < NO_ALLPASS_LINKS; i++) { ps->delay_buf_index_ser[i] = 0; #ifdef PARAM_32KHZ if (sr_index <= 5) /* >= 32 kHz*/ { ps->num_sample_delay_ser[i] = delay_length_d[1][i]; } else { ps->num_sample_delay_ser[i] = delay_length_d[0][i]; } #else /* THESE ARE CONSTANTS NOW */ ps->num_sample_delay_ser[i] = delay_length_d[i]; #endif } #ifdef PARAM_32KHZ if (sr_index <= 5) /* >= 32 kHz*/ { short_delay_band = 35; ps->nr_allpass_bands = 22; ps->alpha_decay = FRAC_CONST(0.76592833836465); ps->alpha_smooth = FRAC_CONST(0.25); } else { short_delay_band = 64; ps->nr_allpass_bands = 45; ps->alpha_decay = FRAC_CONST(0.58664621951003); ps->alpha_smooth = FRAC_CONST(0.6); } #else /* THESE ARE CONSTANTS NOW */ short_delay_band = 35; ps->nr_allpass_bands = 22; ps->alpha_decay = FRAC_CONST(0.76592833836465); ps->alpha_smooth = FRAC_CONST(0.25); #endif /* THESE ARE CONSTANT NOW IF PS IS INDEPENDANT OF SAMPLERATE */ for (i = 0; i < short_delay_band; i++) { ps->delay_D[i] = 14; } for (i = short_delay_band; i < 64; i++) { ps->delay_D[i] = 1; } /* mixing and phase */ for (i = 0; i < 50; i++) { RE(ps->h11_prev[i]) = 1; IM(ps->h12_prev[i]) = 1; RE(ps->h11_prev[i]) = 1; IM(ps->h12_prev[i]) = 1; } ps->phase_hist = 0; for (i = 0; i < 20; i++) { RE(ps->ipd_prev[i][0]) = 0; IM(ps->ipd_prev[i][0]) = 0; RE(ps->ipd_prev[i][1]) = 0; IM(ps->ipd_prev[i][1]) = 0; RE(ps->opd_prev[i][0]) = 0; IM(ps->opd_prev[i][0]) = 0; RE(ps->opd_prev[i][1]) = 0; IM(ps->opd_prev[i][1]) = 0; } return ps; } /* main Parametric Stereo decoding function */ uint8_t ps_decode(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64]) { qmf_t X_hybrid_left[32][32] = {{0}}; qmf_t X_hybrid_right[32][32] = {{0}}; /* delta decoding of the bitstream data */ ps_data_decode(ps); /* set up some parameters depending on filterbank type */ if (ps->use34hybrid_bands) { ps->group_border = (uint8_t*)group_border34; ps->map_group2bk = (uint16_t*)map_group2bk34; ps->num_groups = 32+18; ps->num_hybrid_groups = 32; ps->nr_par_bands = 34; ps->decay_cutoff = 5; } else { ps->group_border = (uint8_t*)group_border20; ps->map_group2bk = (uint16_t*)map_group2bk20; ps->num_groups = 10+12; ps->num_hybrid_groups = 10; ps->nr_par_bands = 20; ps->decay_cutoff = 3; } /* Perform further analysis on the lowest subbands to get a higher * frequency resolution */ hybrid_analysis((hyb_info*)ps->hyb, X_left, X_hybrid_left, ps->use34hybrid_bands); /* decorrelate mono signal */ ps_decorrelate(ps, X_left, X_right, X_hybrid_left, X_hybrid_right); /* apply mixing and phase parameters */ ps_mix_phase(ps, X_left, X_right, X_hybrid_left, X_hybrid_right); /* hybrid synthesis, to rebuild the SBR QMF matrices */ hybrid_synthesis((hyb_info*)ps->hyb, X_left, X_hybrid_left, ps->use34hybrid_bands); hybrid_synthesis((hyb_info*)ps->hyb, X_right, X_hybrid_right, ps->use34hybrid_bands); return 0; } #endif
