aboutsummaryrefslogtreecommitdiffhomepage
path: root/libfaad2/filtbank.c
blob: 377156e222aefba0b2c40703e7d0313f1775ceca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003 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: filtbank.c,v 1.1 2003/08/30 22:30:21 arpi Exp $
**/

#include "common.h"
#include "structs.h"

#include <stdlib.h>
#include <string.h>
#ifdef _WIN32_WCE
#define assert(x)
#else
#include <assert.h>
#endif

#include "filtbank.h"
#include "decoder.h"
#include "syntax.h"
#include "kbd_win.h"
#include "sine_win.h"
#include "mdct.h"


fb_info *filter_bank_init(uint16_t frame_len)
{
    uint16_t nshort = frame_len/8;
#ifdef LD_DEC
    uint16_t frame_len_ld = frame_len/2;
#endif

    fb_info *fb = (fb_info*)malloc(sizeof(fb_info));
    memset(fb, 0, sizeof(fb_info));

    /* normal */
    fb->mdct256 = faad_mdct_init(2*nshort);
    fb->mdct2048 = faad_mdct_init(2*frame_len);
#ifdef LD_DEC
    /* LD */
    fb->mdct1024 = faad_mdct_init(2*frame_len_ld);
#endif

    if (frame_len == 1024)
    {
        fb->long_window[0]  = sine_long_1024;
        fb->short_window[0] = sine_short_128;
        fb->long_window[1]  = kbd_long_1024;
        fb->short_window[1] = kbd_short_128;
#ifdef LD_DEC
        fb->ld_window[0] = sine_mid_512;
        fb->ld_window[1] = ld_mid_512;
#endif
    } else /* (frame_len == 960) */ {
        fb->long_window[0]  = sine_long_960;
        fb->short_window[0] = sine_short_120;
        fb->long_window[1]  = kbd_long_960;
        fb->short_window[1] = kbd_short_120;
#ifdef LD_DEC
        fb->ld_window[0] = sine_mid_480;
        fb->ld_window[1] = ld_mid_480;
#endif
    }

    return fb;
}

void filter_bank_end(fb_info *fb)
{
    if (fb != NULL)
    {
        faad_mdct_end(fb->mdct256);
        faad_mdct_end(fb->mdct2048);
#ifdef LD_DEC
        faad_mdct_end(fb->mdct1024);
#endif

        free(fb);
    }
}

static INLINE void imdct(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len)
{
    mdct_info *mdct;

    switch (len)
    {
    case 2048:
    case 1920:
        mdct = fb->mdct2048;
        break;
    case 256:
    case 240:
        mdct = fb->mdct256;
        break;
#ifdef LD_DEC
    case 1024:
    case 960:
        mdct = fb->mdct1024;
        break;
#endif
    }

    faad_imdct(mdct, in_data, out_data);
}

#ifdef LTP_DEC
static INLINE void mdct(fb_info *fb, real_t *in_data, real_t *out_data, uint16_t len)
{
    mdct_info *mdct;

    switch (len)
    {
    case 2048:
    case 1920:
        mdct = fb->mdct2048;
        break;
    case 256:
    case 240:
        mdct = fb->mdct256;
        break;
#ifdef LD_DEC
    case 1024:
    case 960:
        mdct = fb->mdct1024;
        break;
#endif
    }

    faad_mdct(mdct, in_data, out_data);
}
#endif

void ifilter_bank(fb_info *fb, uint8_t window_sequence, uint8_t window_shape,
                  uint8_t window_shape_prev, real_t *freq_in,
                  real_t *time_out, uint8_t object_type, uint16_t frame_len)
{
    int16_t i;
    real_t *transf_buf;

    real_t *window_long;
    real_t *window_long_prev;
    real_t *window_short;
    real_t *window_short_prev;

    uint16_t nlong = frame_len;
    uint16_t nshort = frame_len/8;
    uint16_t trans = nshort/2;

    uint16_t nflat_ls = (nlong-nshort)/2;

    transf_buf = (real_t*)malloc(2*nlong*sizeof(real_t));

#ifdef LD_DEC
    if (object_type == LD)
    {
        window_long       = fb->ld_window[window_shape];
        window_long_prev  = fb->ld_window[window_shape_prev];
    } else {
#endif
        window_long       = fb->long_window[window_shape];
        window_long_prev  = fb->long_window[window_shape_prev];
        window_short      = fb->short_window[window_shape];
        window_short_prev = fb->short_window[window_shape_prev];
#ifdef LD_DEC
    }
#endif

    switch (window_sequence)
    {
    case ONLY_LONG_SEQUENCE:
        imdct(fb, freq_in, transf_buf, 2*nlong);
        for (i = 0; i < nlong; i+=4)
        {
            time_out[i] = time_out[nlong+i] + MUL_R_C(transf_buf[i],window_long_prev[i]);
            time_out[i+1] = time_out[nlong+i+1] + MUL_R_C(transf_buf[i+1],window_long_prev[i+1]);
            time_out[i+2] = time_out[nlong+i+2] + MUL_R_C(transf_buf[i+2],window_long_prev[i+2]);
            time_out[i+3] = time_out[nlong+i+3] + MUL_R_C(transf_buf[i+3],window_long_prev[i+3]);
        }
        for (i = 0; i < nlong; i+=4)
        {
            time_out[nlong+i] = MUL_R_C(transf_buf[nlong+i],window_long[nlong-1-i]);
            time_out[nlong+i+1] = MUL_R_C(transf_buf[nlong+i+1],window_long[nlong-2-i]);
            time_out[nlong+i+2] = MUL_R_C(transf_buf[nlong+i+2],window_long[nlong-3-i]);
            time_out[nlong+i+3] = MUL_R_C(transf_buf[nlong+i+3],window_long[nlong-4-i]);
        }
        break;

    case LONG_START_SEQUENCE:
        imdct(fb, freq_in, transf_buf, 2*nlong);
        for (i = 0; i < nlong; i+=4)
        {
            time_out[i] = time_out[nlong+i] + MUL_R_C(transf_buf[i],window_long_prev[i]);
            time_out[i+1] = time_out[nlong+i+1] + MUL_R_C(transf_buf[i+1],window_long_prev[i+1]);
            time_out[i+2] = time_out[nlong+i+2] + MUL_R_C(transf_buf[i+2],window_long_prev[i+2]);
            time_out[i+3] = time_out[nlong+i+3] + MUL_R_C(transf_buf[i+3],window_long_prev[i+3]);
        }
        for (i = 0; i < nflat_ls; i++)
            time_out[nlong+i] = transf_buf[nlong+i];
        for (i = 0; i < nshort; i++)
            time_out[nlong+nflat_ls+i] = MUL_R_C(transf_buf[nlong+nflat_ls+i],window_short[nshort-i-1]);
        for (i = 0; i < nflat_ls; i++)
            time_out[nlong+nflat_ls+nshort+i] = 0;
        break;

    case EIGHT_SHORT_SEQUENCE:
        imdct(fb, freq_in+0*nshort, transf_buf+2*nshort*0, 2*nshort);
        imdct(fb, freq_in+1*nshort, transf_buf+2*nshort*1, 2*nshort);
        imdct(fb, freq_in+2*nshort, transf_buf+2*nshort*2, 2*nshort);
        imdct(fb, freq_in+3*nshort, transf_buf+2*nshort*3, 2*nshort);
        imdct(fb, freq_in+4*nshort, transf_buf+2*nshort*4, 2*nshort);
        imdct(fb, freq_in+5*nshort, transf_buf+2*nshort*5, 2*nshort);
        imdct(fb, freq_in+6*nshort, transf_buf+2*nshort*6, 2*nshort);
        imdct(fb, freq_in+7*nshort, transf_buf+2*nshort*7, 2*nshort);
        for (i = 0; i < nflat_ls; i++)
            time_out[i] = time_out[nlong+i];
        for(i = nshort-1; i >= 0; i--)
        {
            time_out[nflat_ls+         i] = time_out[nlong+nflat_ls+         i] + MUL_R_C(transf_buf[nshort*0+i],window_short_prev[i]);
            time_out[nflat_ls+1*nshort+i] = time_out[nlong+nflat_ls+nshort*1+i] + MUL_R_C(transf_buf[nshort*1+i],window_short[nshort-1-i]) + MUL_R_C(transf_buf[nshort*2+i],window_short[i]);
            time_out[nflat_ls+2*nshort+i] = time_out[nlong+nflat_ls+nshort*2+i] + MUL_R_C(transf_buf[nshort*3+i],window_short[nshort-1-i]) + MUL_R_C(transf_buf[nshort*4+i],window_short[i]);
            time_out[nflat_ls+3*nshort+i] = time_out[nlong+nflat_ls+nshort*3+i] + MUL_R_C(transf_buf[nshort*5+i],window_short[nshort-1-i]) + MUL_R_C(transf_buf[nshort*6+i],window_short[i]);
            if (i < trans)
                time_out[nflat_ls+4*nshort+i] = time_out[nlong+nflat_ls+nshort*4+i] + MUL_R_C(transf_buf[nshort*7+i],window_short[nshort-1-i]) + MUL_R_C(transf_buf[nshort*8+i],window_short[i]);
            else
                time_out[nflat_ls+4*nshort+i] = MUL_R_C(transf_buf[nshort*7+i],window_short[nshort-1-i]) + MUL_R_C(transf_buf[nshort*8+i],window_short[i]);
            time_out[nflat_ls+5*nshort+i] = MUL_R_C(transf_buf[nshort*9+i],window_short[nshort-1-i]) + MUL_R_C(transf_buf[nshort*10+i],window_short[i]);
            time_out[nflat_ls+6*nshort+i] = MUL_R_C(transf_buf[nshort*11+i],window_short[nshort-1-i]) + MUL_R_C(transf_buf[nshort*12+i],window_short[i]);
            time_out[nflat_ls+7*nshort+i] = MUL_R_C(transf_buf[nshort*13+i],window_short[nshort-1-i]) + MUL_R_C(transf_buf[nshort*14+i],window_short[i]);
            time_out[nflat_ls+8*nshort+i] = MUL_R_C(transf_buf[nshort*15+i],window_short[nshort-1-i]);
        }
        for (i = 0; i < nflat_ls; i++)
            time_out[nlong+nflat_ls+nshort+i] = 0;
        break;

    case LONG_STOP_SEQUENCE:
        imdct(fb, freq_in, transf_buf, 2*nlong);
        for (i = 0; i < nflat_ls; i++)
            time_out[i] = time_out[nlong+i];
        for (i = 0; i < nshort; i++)
            time_out[nflat_ls+i] = time_out[nlong+nflat_ls+i] + MUL_R_C(transf_buf[nflat_ls+i],window_short_prev[i]);
        for (i = 0; i < nflat_ls; i++)
            time_out[nflat_ls+nshort+i] = time_out[nlong+nflat_ls+nshort+i] + transf_buf[nflat_ls+nshort+i];
        for (i = 0; i < nlong; i++)
            time_out[nlong+i] = MUL_R_C(transf_buf[nlong+i],window_long[nlong-1-i]);
		break;
    }

    free(transf_buf);
}

#ifdef LTP_DEC
/* only works for LTP -> no overlapping, no short blocks */
void filter_bank_ltp(fb_info *fb, uint8_t window_sequence, uint8_t window_shape,
                     uint8_t window_shape_prev, real_t *in_data, real_t *out_mdct,
                     uint8_t object_type, uint16_t frame_len)
{
    int16_t i;
    real_t *windowed_buf;

    real_t *window_long;
    real_t *window_long_prev;
    real_t *window_short;
    real_t *window_short_prev;

    uint16_t nlong = frame_len;
    uint16_t nshort = frame_len/8;
    uint16_t nflat_ls = (nlong-nshort)/2;

    assert(window_sequence != EIGHT_SHORT_SEQUENCE);

    windowed_buf = (real_t*)malloc(nlong*2*sizeof(real_t));

#ifdef LD_DEC
    if (object_type == LD)
    {
        window_long       = fb->ld_window[window_shape];
        window_long_prev  = fb->ld_window[window_shape_prev];
    } else {
#endif
        window_long       = fb->long_window[window_shape];
        window_long_prev  = fb->long_window[window_shape_prev];
        window_short      = fb->short_window[window_shape];
        window_short_prev = fb->short_window[window_shape_prev];
#ifdef LD_DEC
    }
#endif

    switch(window_sequence)
    {
    case ONLY_LONG_SEQUENCE:
        for (i = nlong-1; i >= 0; i--)
        {
            windowed_buf[i] = MUL_R_C(in_data[i], window_long_prev[i]);
            windowed_buf[i+nlong] = MUL_R_C(in_data[i+nlong], window_long[nlong-1-i]);
        }
        mdct(fb, windowed_buf, out_mdct, 2*nlong);
        break;

    case LONG_START_SEQUENCE:
        for (i = 0; i < nlong; i++)
            windowed_buf[i] = MUL_R_C(in_data[i], window_long_prev[i]);
        for (i = 0; i < nflat_ls; i++)
            windowed_buf[i+nlong] = in_data[i+nlong];
        for (i = 0; i < nshort; i++)
            windowed_buf[i+nlong+nflat_ls] = MUL_R_C(in_data[i+nlong+nflat_ls], window_short[nshort-1-i]);
        for (i = 0; i < nflat_ls; i++)
            windowed_buf[i+nlong+nflat_ls+nshort] = 0;
        mdct(fb, windowed_buf, out_mdct, 2*nlong);
        break;

    case LONG_STOP_SEQUENCE:
        for (i = 0; i < nflat_ls; i++)
            windowed_buf[i] = 0;
        for (i = 0; i < nshort; i++)
            windowed_buf[i+nflat_ls] = MUL_R_C(in_data[i+nflat_ls], window_short_prev[i]);
        for (i = 0; i < nflat_ls; i++)
            windowed_buf[i+nflat_ls+nshort] = in_data[i+nflat_ls+nshort];
        for (i = 0; i < nlong; i++)
            windowed_buf[i+nlong] = MUL_R_C(in_data[i+nlong], window_long[nlong-1-i]);
        mdct(fb, windowed_buf, out_mdct, 2*nlong);
        break;
    }

    free(windowed_buf);
}
#endif