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diff --git a/audio_codec/libfaad/ps_dec.c b/audio_codec/libfaad/ps_dec.c new file mode 100644 index 0000000..2cd2e5e --- a/dev/null +++ b/audio_codec/libfaad/ps_dec.c @@ -0,0 +1,1905 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003-2005 M. Bakker, Nero 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. +** +** The "appropriate copyright message" mentioned in section 2c of the GPLv2 +** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com" +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Nero AG through Mpeg4AAClicense@nero.com. +** +** $Id: ps_dec.c,v 1.16 2009/01/26 22:32:31 menno Exp $ +**/ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include "common.h" + +#ifdef PS_DEC + +#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(uint8_t numTimeSlotsRate); +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, uint8_t numTimeSlotsRate); +static void hybrid_synthesis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32], + uint8_t use34, uint8_t numTimeSlotsRate); +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 and_modulo); +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 numTimeSlotsRate) +{ + 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 = numTimeSlotsRate; + + 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) { + return; + } + + 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 numTimeSlotsRate) +{ + 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 < numTimeSlotsRate; 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 numTimeSlotsRate) +{ + 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 %d\n", index_prev[i*stride], index[i]); + //printf("%d\n", 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 %d\n", 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 and_modulo) +{ + int8_t i; + + if (enable == 1) { + if (dt_flag == 0) { + /* delta coded in frequency direction */ + index[0] = 0 + index[0]; + index[0] &= and_modulo; + + for (i = 1; i < nr_par; i++) { + index[i] = index[i - 1] + index[i]; + index[i] &= and_modulo; + } + } else { + /* delta coded in time direction */ + for (i = 0; i < nr_par; i++) { + index[i] = index_prev[i * stride] + index[i]; + index[i] &= and_modulo; + } + } + } 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, 7); + + /* 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, 7); + } + + /* 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 * ps->numTimeSlotsRate) / ps->num_env; + } + ps->border_position[ps->num_env] = ps->numTimeSlotsRate; + } else { + ps->border_position[0] = 0; + + if (ps->border_position[ps->num_env] < ps->numTimeSlotsRate) { + 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]; + } + ps->num_env++; + ps->border_position[ps->num_env] = ps->numTimeSlotsRate; + } + + for (env = 1; env < ps->num_env; env++) { + int8_t thr = ps->numTimeSlotsRate - (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: %d\n", n, bk, P[n][bk] /*/(float)REAL_PRECISION*/); +#else + printf("%d %d: %f\n", 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: %f\n", n, bk, G_TransientRatio[n][bk] / (float)REAL_PRECISION); +#else + printf("%d %d: %f\n", 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 real_t magnitude_c(complex_t c) +{ +#ifdef FIXED_POINT +#define ps_abs(A) (((A) > 0) ? (A) : (-(A))) +#define ALPHA FRAC_CONST(0.948059448969) +#define BETA FRAC_CONST(0.392699081699) + + real_t abs_inphase = ps_abs(RE(c)); + real_t abs_quadrature = ps_abs(IM(c)); + + if (abs_inphase > abs_quadrature) { + return MUL_F(abs_inphase, ALPHA) + MUL_F(abs_quadrature, BETA); + } else { + return MUL_F(abs_quadrature, ALPHA) + MUL_F(abs_inphase, BETA); + } +#else + return sqrt(RE(c) * RE(c) + IM(c) * IM(c)); +#endif +} + +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("%d\n", 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 xy, pq, xypq; + + /* 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)) = y/sqrt((x*x) + (y*y)) + // sin(atan2(x,y)) = x/sqrt((x*x) + (y*y)) + // cos(atan2(x,y)-atan2(p,q)) = (y*q + x*p) / ( sqrt((x*x) + (y*y)) * sqrt((p*p) + (q*q)) ); + // sin(atan2(x,y)-atan2(p,q)) = (x*q - y*p) / ( sqrt((x*x) + (y*y)) * sqrt((p*p) + (q*q)) ); + + xy = magnitude_c(tempRight); + pq = magnitude_c(tempLeft); + + if (xy != 0) { + RE(phaseLeft) = DIV_R(RE(tempRight), xy); + IM(phaseLeft) = DIV_R(IM(tempRight), xy); + } else { + RE(phaseLeft) = 0; + IM(phaseLeft) = 0; + } + + xypq = MUL_R(xy, pq); + + if (xypq != 0) { + real_t tmp1 = MUL_R(RE(tempRight), RE(tempLeft)) + MUL_R(IM(tempRight), IM(tempLeft)); + real_t tmp2 = MUL_R(IM(tempRight), RE(tempLeft)) - MUL_R(RE(tempRight), IM(tempLeft)); + + RE(phaseRight) = DIV_R(tmp1, xypq); + IM(phaseRight) = DIV_R(tmp2, xypq); + } else { + RE(phaseRight) = 0; + IM(phaseRight) = 0; + } + +#endif + + /* MUL_F(COEF, REAL) = COEF */ + IM(h11) = MUL_R(RE(h11), IM(phaseLeft)); + IM(h12) = MUL_R(RE(h12), IM(phaseRight)); + IM(h21) = MUL_R(RE(h21), IM(phaseLeft)); + IM(h22) = MUL_R(RE(h22), IM(phaseRight)); + + RE(h11) = MUL_R(RE(h11), RE(phaseLeft)); + RE(h12) = MUL_R(RE(h12), RE(phaseRight)); + RE(h21) = MUL_R(RE(h21), RE(phaseLeft)); + RE(h22) = MUL_R(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 numTimeSlotsRate) +{ + 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(numTimeSlotsRate); + ps->numTimeSlotsRate = numTimeSlotsRate; + + 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, ps->numTimeSlotsRate); + + /* 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, ps->numTimeSlotsRate); + + hybrid_synthesis((hyb_info*)ps->hyb, X_right, X_hybrid_right, + ps->use34hybrid_bands, ps->numTimeSlotsRate); + + return 0; +} + +#endif + |