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
349
350
351
352
353
354
355
|
/* ------------------------------------------------------------------
* Copyright (C) 1998-2009 PacketVideo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
/*
Pathname: infoinit.c
------------------------------------------------------------------------------
REVISION HISTORY
Description: Modified from original shareware code
Description: Modified to pass variables by reference to eliminate use
of global variables.
Description: Pass eight_short_info and the array 'sfbwidth128'.
Change function arguments' names for clarity
Description: move sfb definitions to "sfb.h", and "sfb.c", eliminated
the function "huffbookinit.c"
Description: Remove initialization of the never used array,
pFrameInfo->group_offs
Description:
(1) Changed "stdinc.h" to <stdlib.h> - this avoids linking in the math
library and stdio.h. (All for just defining the NULL pointer macro)
(2) Updated copyright header.
Description: Updated the SW template to include the full pathname to the
source file and a slightly modified copyright header.
Description: Addresses of constant vectors are now found by means of a
switch statement, this solve linking problem when using the
/ropi option (Read-only position independent) for some
compilers
Who: Date:
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
pSi = pointer to sampling rate info
ppWin_seq_info = pointer array to window sequence Info struct
pSfbwidth128 = pointer to sfb bandwidth array of short window
Local Stores/Buffers/Pointers Needed:
Global Stores/Buffers/Pointers Needed:
Outputs:
Pointers and Buffers Modified:
ppWin_seq_info[ONLY_LONG_WINDOW]{all structure members} = setup values
ppWin_seq_info[EIGHT_SHORT_WINDOW]{all structure members} = setup values
Local Stores Modified:
Global Stores Modified:
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function sets the values of 'Info' structure for blocks containing long
and short window sequences, the following structures are being set:
win_seq_info[ONLY_LONG_WINDOW], win_seq_info[EIGHT_SHORT_WINDOW],
only_long_info and eight_short_info
------------------------------------------------------------------------------
REQUIREMENTS
------------------------------------------------------------------------------
REFERENCES
(1) MPEG-2 NBC Audio Decoder
"This software module was originally developed by AT&T, Dolby
Laboratories, Fraunhofer Gesellschaft IIS in the course of development
of the MPEG-2 NBC/MPEG-4 Audio standard ISO/IEC 13818-7, 14496-1,2 and
3. This software module is an implementation of a part of one or more
MPEG-2 NBC/MPEG-4 Audio tools as specified by the MPEG-2 NBC/MPEG-4
Audio standard. ISO/IEC gives users of the MPEG-2 NBC/MPEG-4 Audio
standards free license to this software module or modifications thereof
for use in hardware or software products claiming conformance to the
MPEG-2 NBC/MPEG-4 Audio standards. Those intending to use this software
module in hardware or software products are advised that this use may
infringe existing patents. The original developer of this software
module and his/her company, the subsequent editors and their companies,
and ISO/IEC have no liability for use of this software module or
modifications thereof in an implementation. Copyright is not released
for non MPEG-2 NBC/MPEG-4 Audio conforming products.The original
developer retains full right to use the code for his/her own purpose,
assign or donate the code to a third party and to inhibit third party
from using the code for non MPEG-2 NBC/MPEG-4 Audio conforming products.
This copyright notice must be included in all copies or derivative
works."
Copyright(c)1996.
(2) ISO/IEC 14496-3: 1999(E)
Subpart 4 p66 (sfb tables)
p111 (4.6.10)
p200 (Annex 4.B.5)
------------------------------------------------------------------------------
PSEUDO-CODE
pFrameInfo = pointer to only_long_info;
win_seq_info[ONLY_LONG_WINDOW] = pFrameInfo;
pFrameInfo{all structure members} = setup values;
pFrameInfo = pointer to eight_short_info;
win_seq_info[EIGHT_SHORT_WINDOW] = pFrameInfo;
pFrameInfo{all structure.members} = setup values;
FOR (window_seq = 0; window_seq < NUM_WIN_SEQ; win_seq++)
win_seq_info[window_seq].members = setup values;
ENDFOR
------------------------------------------------------------------------------
RESOURCES USED
When the code is written for a specific target processor the
the resources used should be documented below.
STACK USAGE:
DATA MEMORY USED: x words
PROGRAM MEMORY USED: x words
CLOCK CYCLES:
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "pv_audio_type_defs.h"
#include "s_sr_info.h"
#include "s_frameinfo.h"
#include "e_blockswitching.h"
#include "e_huffmanconst.h"
#include "sfb.h"
#include "huffman.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; Function Prototype declaration
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL STORE/BUFFER/POINTER DEFINITIONS
; Variable declaration - defined here and used outside this module
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL FUNCTION REFERENCES
; Declare functions defined elsewhere and referenced in this module
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
; Declare variables used in this module but defined elsewhere
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
Int infoinit(
const Int samp_rate_idx,
FrameInfo **ppWin_seq_info,
Int *pSfbwidth128)
{
/*----------------------------------------------------------------------------
; Define all local variables
----------------------------------------------------------------------------*/
Int i;
Int sfb_idx, sfb_sbk;
Int bins_sbk;
Int win_seq;
Int start_idx, end_idx;
Int nsfb_short;
Int16 *sfbands;
FrameInfo *pFrameInfo;
const SR_Info *pSi = &(samp_rate_info[samp_rate_idx]);
const Int16 * pt_SFbands1024 = NULL;
const Int16 * pt_SFbands128 = NULL;
/*----------------------------------------------------------------------------
; Function body here
----------------------------------------------------------------------------*/
switch (pSi->samp_rate)
{
case 96000:
case 88200:
pt_SFbands1024 = sfb_96_1024;
pt_SFbands128 = sfb_64_128; /* equal to table sfb_96_128, (eliminated) */
break;
case 64000:
pt_SFbands1024 = sfb_64_1024;
pt_SFbands128 = sfb_64_128;
break;
case 48000:
case 44100:
pt_SFbands1024 = sfb_48_1024;
pt_SFbands128 = sfb_48_128;
break;
case 32000:
pt_SFbands1024 = sfb_32_1024;
pt_SFbands128 = sfb_48_128;
break;
case 24000:
case 22050:
pt_SFbands1024 = sfb_24_1024;
pt_SFbands128 = sfb_24_128;
break;
case 16000:
case 12000:
case 11025:
pt_SFbands1024 = sfb_16_1024;
pt_SFbands128 = sfb_16_128;
break;
case 8000:
pt_SFbands1024 = sfb_8_1024;
pt_SFbands128 = sfb_8_128;
break;
default:
// sampling rate not supported
return -1;
}
/* long block info */
pFrameInfo = ppWin_seq_info[ONLY_LONG_WINDOW];
pFrameInfo->islong = 1;
pFrameInfo->num_win = 1;
pFrameInfo->coef_per_frame = LN2; /* = 1024 */
pFrameInfo->sfb_per_win[0] = pSi->nsfb1024;
pFrameInfo->sectbits[0] = LONG_SECT_BITS;
pFrameInfo->win_sfb_top[0] = (Int16 *)pt_SFbands1024;
pFrameInfo->sfb_width_128 = NULL; /* no short block sfb */
pFrameInfo->num_groups = 1; /* long block, one group */
pFrameInfo->group_len[0] = 1; /* only one window */
/* short block info */
pFrameInfo = ppWin_seq_info[EIGHT_SHORT_WINDOW];
pFrameInfo->islong = 0;
pFrameInfo->num_win = NSHORT;
pFrameInfo->coef_per_frame = LN2;
for (i = 0; i < pFrameInfo->num_win; i++)
{
pFrameInfo->sfb_per_win[i] = pSi->nsfb128;
pFrameInfo->sectbits[i] = SHORT_SECT_BITS;
pFrameInfo->win_sfb_top[i] = (Int16 *)pt_SFbands128;
}
/* construct sfb width table */
pFrameInfo->sfb_width_128 = pSfbwidth128;
for (i = 0, start_idx = 0, nsfb_short = pSi->nsfb128; i < nsfb_short; i++)
{
end_idx = pt_SFbands128[i];
pSfbwidth128[i] = end_idx - start_idx;
start_idx = end_idx;
}
/* common to long and short */
for (win_seq = 0; win_seq < NUM_WIN_SEQ; win_seq++)
{
if (ppWin_seq_info[win_seq] != NULL)
{
pFrameInfo = ppWin_seq_info[win_seq];
pFrameInfo->sfb_per_frame = 0;
sfb_sbk = 0;
bins_sbk = 0;
for (i = 0; i < pFrameInfo->num_win; i++)
{
/* compute coef_per_win */
pFrameInfo->coef_per_win[i] =
pFrameInfo->coef_per_frame / pFrameInfo->num_win;
/* compute sfb_per_frame */
pFrameInfo->sfb_per_frame += pFrameInfo->sfb_per_win[i];
/* construct default (non-interleaved) bk_sfb_top[] */
sfbands = pFrameInfo->win_sfb_top[i];
for (sfb_idx = 0; sfb_idx < pFrameInfo->sfb_per_win[i];
sfb_idx++)
{
pFrameInfo->frame_sfb_top[sfb_idx+sfb_sbk] =
sfbands[sfb_idx] + bins_sbk;
}
bins_sbk += pFrameInfo->coef_per_win[i];
sfb_sbk += pFrameInfo->sfb_per_win[i];
} /* for i = sbk ends */
}
} /* for win_seq ends */
return SUCCESS;
} /* infoinit */
|
