get_amr_wb_bits.cpp revision 4f1efc098cb5791c3e9f483f2af84aef70d2d0a0 
1/* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18/****************************************************************************************
19Portions of this file are derived from the following 3GPP standard:
20
21    3GPP TS 26.173
22    ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec
23    Available from http://www.3gpp.org
24
25(C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26Permission to distribute, modify and use this file under the standard license
27terms listed above has been obtained from the copyright holder.
28****************************************************************************************/
29/*
30------------------------------------------------------------------------------
31
32
33
34 Filename: get_amr_wb_bits.cpp
35
36     Date: 05/08/2007
37
38------------------------------------------------------------------------------
39 REVISION HISTORY
40
41
42 Description:
43
44------------------------------------------------------------------------------
45 INPUT AND OUTPUT DEFINITIONS
46
47     int16 no_of_bits,        input : number of bits
48     int16 ** prms            bitstream pointer
49
50
51------------------------------------------------------------------------------
52 FUNCTION DESCRIPTION
53
54    Returns no_of_bits from serial bit stream
55    Serial_parm -> convert serial stream to parameters
56
57------------------------------------------------------------------------------
58 REQUIREMENTS
59
60
61------------------------------------------------------------------------------
62 REFERENCES
63
64------------------------------------------------------------------------------
65 PSEUDO-CODE
66
67------------------------------------------------------------------------------
68*/
69
70
71/*----------------------------------------------------------------------------
72; INCLUDES
73----------------------------------------------------------------------------*/
74
75#include "pv_amr_wb_type_defs.h"
76#include "pvamrwbdecoder_cnst.h"
77#include "get_amr_wb_bits.h"
78
79/*----------------------------------------------------------------------------
80; MACROS
81; Define module specific macros here
82----------------------------------------------------------------------------*/
83
84
85/*----------------------------------------------------------------------------
86; DEFINES
87; Include all pre-processor statements here. Include conditional
88; compile variables also.
89----------------------------------------------------------------------------*/
90
91/*----------------------------------------------------------------------------
92; LOCAL FUNCTION DEFINITIONS
93; Function Prototype declaration
94----------------------------------------------------------------------------*/
95
96/*----------------------------------------------------------------------------
97; LOCAL STORE/BUFFER/POINTER DEFINITIONS
98; Variable declaration - defined here and used outside this module
99----------------------------------------------------------------------------*/
100
101/*----------------------------------------------------------------------------
102; EXTERNAL FUNCTION REFERENCES
103; Declare functions defined elsewhere and referenced in this module
104----------------------------------------------------------------------------*/
105
106/*----------------------------------------------------------------------------
107; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
108; Declare variables used in this module but defined elsewhere
109----------------------------------------------------------------------------*/
110
111/*----------------------------------------------------------------------------
112; FUNCTION CODE
113----------------------------------------------------------------------------*/
114
115
116int16 Serial_parm(                        /* Return the parameter    */
117    int16 no_of_bits,                    /* input : number of bits  */
118    int16 ** prms
119)
120{
121    int16 value = 0;
122
123    for (int16 i = no_of_bits >> 1; i != 0; i--)
124    {
125        value <<= 2;
126
127        if (*((*prms)++) == BIT_1)
128        {
129            value |= 2;
130        }
131
132        if (*((*prms)++) == BIT_1)
133        {
134            value |= 1;
135        }
136
137    }
138
139    if (no_of_bits&1)
140    {
141        value <<= 1;
142
143        if (*((*prms)++) == BIT_1)
144        {
145            value |= 1;
146        }
147
148    }
149
150    return (value);
151}
152
153
154int16 Serial_parm_1bit(int16 ** prms)                 /* Return the parameter    */
155{
156    int16 value = 0;
157
158    if (*((*prms)++) == BIT_1)
159    {
160        value = 1;
161    }
162    return (value);
163}
164