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
|
/* ------------------------------------------------------------------
* 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.
* -------------------------------------------------------------------
*/
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:
3GPP TS 26.073
ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
Available from http://www.3gpp.org
(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
Filename: /audio/gsm_amr/c/src/bits2prm.c
------------------------------------------------------------------------------
REVISION HISTORY
Description: Fixed a typo in the include section. Optimized some lines of
code as per review comments.
Description: Replaced "int" and/or "char" with OSCL defined types.
Who: Date:
Description:
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "bits2prm.h"
#include "typedef.h"
#include "mode.h"
#include "bitno_tab.h"
/*----------------------------------------------------------------------------
; MACROS
; [Define module specific macros here]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; [Include all pre-processor statements here. Include conditional
; compile variables also.]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; [List function prototypes here]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL VARIABLE DEFINITIONS
; [Variable declaration - defined here and used outside this module]
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: Bin2int
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
no_of_bits = number of bits associated with value
bitstream = pointer to buffer where bits are read
Outputs:
None
Returns:
None
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Function : Bin2int
Purpose : Read "no_of_bits" bits from the array bitstream[]
and convert to integer.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
bits2prm.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
static Word16 Bin2int ( // Reconstructed parameter
Word16 no_of_bits, // input : number of bits associated with value
Word16 *bitstream // output: address where bits are written
)
{
Word16 value, i, bit;
value = 0;
for (i = 0; i < no_of_bits; i++)
{
value = shl (value, 1);
bit = *bitstream++;
if (sub (bit, BIT_1) == 0)
value = add (value, 1);
}
return (value);
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
static Word16 Bin2int( /* Reconstructed parameter */
Word16 no_of_bits, /* input : number of bits associated with value */
Word16 *bitstream /* input: address where bits are read from */
)
{
Word16 value;
Word16 i;
Word16 single_bit;
value = 0;
for (i = 0; i < no_of_bits; i++)
{
value <<= 1;
single_bit = *(bitstream++);
value |= single_bit;
}
return (value);
}
/*
------------------------------------------------------------------------------
FUNCTION NAME: bits2prm
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
mode = AMR mode of type enum Mode
bits[] = pointer to serial bits of type Word16
prm[] = pointer to analysis parameters of type Word16
Outputs:
None
Returns:
None
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Function : Bits2prm
Purpose : Retrieves the vector of encoder parameters from
the received serial bits in a frame.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
bits2prm.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
void Bits2prm (
enum Mode mode, // i : AMR mode
Word16 bits[], // i : serial bits (size <= MAX_SERIAL_SIZE)
Word16 prm[] // o : analysis parameters (size <= MAX_PRM_SIZE)
)
{
Word16 i;
for (i = 0; i < prmno[mode]; i++)
{
prm[i] = Bin2int (bitno[mode][i], bits);
bits += bitno[mode][i];
add(0,0); // account for above pointer update
}
return;
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
OSCL_EXPORT_REF void Bits2prm(
enum Mode mode, /* i : AMR mode */
Word16 bits[], /* i : serial bits (size <= MAX_SERIAL_SIZE) */
Word16 prm[] /* o : analysis parameters (size <= MAX_PRM_SIZE) */
)
{
Word16 i;
for (i = 0; i < prmno[mode]; i++)
{
prm[i] = Bin2int(bitno[mode][i], bits);
bits += bitno[mode][i];
}
return;
}
|
