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path: root/audio_codec/libfaad/ssr_fb.c (plain)
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1/*
2** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
3** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
4**
5** This program is free software; you can redistribute it and/or modify
6** it under the terms of the GNU General Public License as published by
7** the Free Software Foundation; either version 2 of the License, or
8** (at your option) any later version.
9**
10** This program is distributed in the hope that it will be useful,
11** but WITHOUT ANY WARRANTY; without even the implied warranty of
12** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13** GNU General Public License for more details.
14**
15** You should have received a copy of the GNU General Public License
16** along with this program; if not, write to the Free Software
17** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18**
19** Any non-GPL usage of this software or parts of this software is strictly
20** forbidden.
21**
22** The "appropriate copyright message" mentioned in section 2c of the GPLv2
23** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
24**
25** Commercial non-GPL licensing of this software is possible.
26** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
27**
28** $Id: ssr_fb.c,v 1.17 2007/11/01 12:33:36 menno Exp $
29**/
30
31#include "common.h"
32#include "structs.h"
33
34#ifdef SSR_DEC
35
36#include <string.h>
37#include <stdlib.h>
38#include "syntax.h"
39#include "filtbank.h"
40#include "mdct.h"
41#include "ssr_fb.h"
42#include "ssr_win.h"
43
44fb_info *ssr_filter_bank_init(uint16_t frame_len)
45{
46 uint16_t nshort = frame_len / 8;
47
48 fb_info *fb = (fb_info*)faad_malloc(sizeof(fb_info));
49 memset(fb, 0, sizeof(fb_info));
50
51 /* normal */
52 fb->mdct256 = faad_mdct_init(2 * nshort);
53 fb->mdct2048 = faad_mdct_init(2 * frame_len);
54
55 fb->long_window[0] = sine_long_256;
56 fb->short_window[0] = sine_short_32;
57 fb->long_window[1] = kbd_long_256;
58 fb->short_window[1] = kbd_short_32;
59
60 return fb;
61}
62
63void ssr_filter_bank_end(fb_info *fb)
64{
65 faad_mdct_end(fb->mdct256);
66 faad_mdct_end(fb->mdct2048);
67
68 if (fb) {
69 faad_free(fb);
70 }
71}
72
73static INLINE void imdct_ssr(fb_info *fb, real_t *in_data,
74 real_t *out_data, uint16_t len)
75{
76 mdct_info *mdct;
77
78 switch (len) {
79 case 512:
80 mdct = fb->mdct2048;
81 break;
82 case 64:
83 mdct = fb->mdct256;
84 break;
85 }
86
87 faad_imdct(mdct, in_data, out_data);
88}
89
90/* NON-overlapping inverse filterbank for use with SSR */
91void ssr_ifilter_bank(fb_info *fb, uint8_t window_sequence, uint8_t window_shape,
92 uint8_t window_shape_prev, real_t *freq_in,
93 real_t *time_out, uint16_t frame_len)
94{
95 int16_t i;
96 real_t *transf_buf;
97
98 real_t *window_long;
99 real_t *window_long_prev;
100 real_t *window_short;
101 real_t *window_short_prev;
102
103 uint16_t nlong = frame_len;
104 uint16_t nshort = frame_len / 8;
105 uint16_t trans = nshort / 2;
106
107 uint16_t nflat_ls = (nlong - nshort) / 2;
108
109 transf_buf = (real_t*)faad_malloc(2 * nlong * sizeof(real_t));
110
111 window_long = fb->long_window[window_shape];
112 window_long_prev = fb->long_window[window_shape_prev];
113 window_short = fb->short_window[window_shape];
114 window_short_prev = fb->short_window[window_shape_prev];
115
116 switch (window_sequence) {
117 case ONLY_LONG_SEQUENCE:
118 imdct_ssr(fb, freq_in, transf_buf, 2 * nlong);
119 for (i = nlong - 1; i >= 0; i--) {
120 time_out[i] = MUL_R_C(transf_buf[i], window_long_prev[i]);
121 time_out[nlong + i] = MUL_R_C(transf_buf[nlong + i], window_long[nlong - 1 - i]);
122 }
123 break;
124
125 case LONG_START_SEQUENCE:
126 imdct_ssr(fb, freq_in, transf_buf, 2 * nlong);
127 for (i = 0; i < nlong; i++) {
128 time_out[i] = MUL_R_C(transf_buf[i], window_long_prev[i]);
129 }
130 for (i = 0; i < nflat_ls; i++) {
131 time_out[nlong + i] = transf_buf[nlong + i];
132 }
133 for (i = 0; i < nshort; i++) {
134 time_out[nlong + nflat_ls + i] = MUL_R_C(transf_buf[nlong + nflat_ls + i], window_short[nshort - i - 1]);
135 }
136 for (i = 0; i < nflat_ls; i++) {
137 time_out[nlong + nflat_ls + nshort + i] = 0;
138 }
139 break;
140
141 case EIGHT_SHORT_SEQUENCE:
142 imdct_ssr(fb, freq_in + 0 * nshort, transf_buf + 2 * nshort * 0, 2 * nshort);
143 imdct_ssr(fb, freq_in + 1 * nshort, transf_buf + 2 * nshort * 1, 2 * nshort);
144 imdct_ssr(fb, freq_in + 2 * nshort, transf_buf + 2 * nshort * 2, 2 * nshort);
145 imdct_ssr(fb, freq_in + 3 * nshort, transf_buf + 2 * nshort * 3, 2 * nshort);
146 imdct_ssr(fb, freq_in + 4 * nshort, transf_buf + 2 * nshort * 4, 2 * nshort);
147 imdct_ssr(fb, freq_in + 5 * nshort, transf_buf + 2 * nshort * 5, 2 * nshort);
148 imdct_ssr(fb, freq_in + 6 * nshort, transf_buf + 2 * nshort * 6, 2 * nshort);
149 imdct_ssr(fb, freq_in + 7 * nshort, transf_buf + 2 * nshort * 7, 2 * nshort);
150 for (i = nshort - 1; i >= 0; i--) {
151 time_out[i + 0 * nshort] = MUL_R_C(transf_buf[nshort * 0 + i], window_short_prev[i]);
152 time_out[i + 1 * nshort] = MUL_R_C(transf_buf[nshort * 1 + i], window_short[i]);
153 time_out[i + 2 * nshort] = MUL_R_C(transf_buf[nshort * 2 + i], window_short_prev[i]);
154 time_out[i + 3 * nshort] = MUL_R_C(transf_buf[nshort * 3 + i], window_short[i]);
155 time_out[i + 4 * nshort] = MUL_R_C(transf_buf[nshort * 4 + i], window_short_prev[i]);
156 time_out[i + 5 * nshort] = MUL_R_C(transf_buf[nshort * 5 + i], window_short[i]);
157 time_out[i + 6 * nshort] = MUL_R_C(transf_buf[nshort * 6 + i], window_short_prev[i]);
158 time_out[i + 7 * nshort] = MUL_R_C(transf_buf[nshort * 7 + i], window_short[i]);
159 time_out[i + 8 * nshort] = MUL_R_C(transf_buf[nshort * 8 + i], window_short_prev[i]);
160 time_out[i + 9 * nshort] = MUL_R_C(transf_buf[nshort * 9 + i], window_short[i]);
161 time_out[i + 10 * nshort] = MUL_R_C(transf_buf[nshort * 10 + i], window_short_prev[i]);
162 time_out[i + 11 * nshort] = MUL_R_C(transf_buf[nshort * 11 + i], window_short[i]);
163 time_out[i + 12 * nshort] = MUL_R_C(transf_buf[nshort * 12 + i], window_short_prev[i]);
164 time_out[i + 13 * nshort] = MUL_R_C(transf_buf[nshort * 13 + i], window_short[i]);
165 time_out[i + 14 * nshort] = MUL_R_C(transf_buf[nshort * 14 + i], window_short_prev[i]);
166 time_out[i + 15 * nshort] = MUL_R_C(transf_buf[nshort * 15 + i], window_short[i]);
167 }
168 break;
169
170 case LONG_STOP_SEQUENCE:
171 imdct_ssr(fb, freq_in, transf_buf, 2 * nlong);
172 for (i = 0; i < nflat_ls; i++) {
173 time_out[i] = 0;
174 }
175 for (i = 0; i < nshort; i++) {
176 time_out[nflat_ls + i] = MUL_R_C(transf_buf[nflat_ls + i], window_short_prev[i]);
177 }
178 for (i = 0; i < nflat_ls; i++) {
179 time_out[nflat_ls + nshort + i] = transf_buf[nflat_ls + nshort + i];
180 }
181 for (i = 0; i < nlong; i++) {
182 time_out[nlong + i] = MUL_R_C(transf_buf[nlong + i], window_long[nlong - 1 - i]);
183 }
184 break;
185 }
186
187 faad_free(transf_buf);
188}
189
190
191#endif
192
generated by cgit at 2024-05-18 21:01:48 (GMT)