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 /*
19 ------------------------------------------------------------------------------
20 PacketVideo Corp.
21 MP3 Decoder Library
22
23 Filename: pvmp3_getbits.h
24
25 Date: 09/21/2007
26
27 ------------------------------------------------------------------------------
28 REVISION HISTORY
29
30 Description:
31
32 ------------------------------------------------------------------------------
33 INCLUDE DESCRIPTION
34
35
36 ------------------------------------------------------------------------------
37 */
38
39 /*----------------------------------------------------------------------------
40 ; CONTINUE ONLY IF NOT ALREADY DEFINED
41 ----------------------------------------------------------------------------*/
42 #ifndef PVMP3_GETBITS_H
43 #define PVMP3_GETBITS_H
44
45 /*----------------------------------------------------------------------------
46 ; INCLUDES
47 ----------------------------------------------------------------------------*/
48 #include "pvmp3_dec_defs.h"
49 #include "s_mp3bits.h"
50 #include "pvmp3_audio_type_defs.h"
51
52 /*----------------------------------------------------------------------------
53 ; MACROS
54 ; Define module specific macros here
55 ----------------------------------------------------------------------------*/
56
57 /*----------------------------------------------------------------------------
58 ; DEFINES
59 ; Include all pre-processor statements here.
60 ----------------------------------------------------------------------------*/
61 #define INBUF_ARRAY_INDEX_SHIFT (3)
62 #define INBUF_BIT_WIDTH (1<<(INBUF_ARRAY_INDEX_SHIFT))
63 #define INBUF_BIT_MODULO_MASK ((INBUF_BIT_WIDTH)-1)
64
65
66 /*----------------------------------------------------------------------------
67 ; EXTERNAL VARIABLES REFERENCES
68 ; Declare variables used in this module but defined elsewhere
69 ----------------------------------------------------------------------------*/
70
71 /*----------------------------------------------------------------------------
72 ; SIMPLE TYPEDEF'S
73 ----------------------------------------------------------------------------*/
74
75 /*----------------------------------------------------------------------------
76 ; ENUMERATED TYPEDEF'S
77 ----------------------------------------------------------------------------*/
78
79 /*----------------------------------------------------------------------------
80 ; STRUCTURES TYPEDEF'S
81 ----------------------------------------------------------------------------*/
82 #ifdef __cplusplus
83 extern "C"
84 {
85 #endif
86
87 uint32 getNbits(tmp3Bits *pMainData,
88 int32 neededBits);
89
90 uint16 getUpTo9bits(tmp3Bits *pMainData,
91 int32 neededBits);
92
93 uint32 getUpTo17bits(tmp3Bits *pMainData,
94 int32 neededBits);
95
96 uint8 get1bit(tmp3Bits *pMainData);
97
98 #ifdef __cplusplus
99 }
100 #endif
101
102 /*----------------------------------------------------------------------------
103 ; GLOBAL FUNCTION DEFINITIONS
104 ; Function Prototype declaration
105 ----------------------------------------------------------------------------*/
106
bitsAvailable(tmp3Bits * inputStream,uint32 neededBits)107 static inline bool bitsAvailable(tmp3Bits *inputStream, uint32 neededBits)
108 {
109 return (inputStream->inputBufferCurrentLength << 3) >= (neededBits + inputStream->usedBits);
110 }
111
112 /*----------------------------------------------------------------------------
113 ; END
114 ----------------------------------------------------------------------------*/
115
116 #endif
117
118