MetaData.h revision 30ab66297501757d745b9ae10da61adcd891f497 
1/*
2 * Copyright (C) 2009 The Android Open Source Project
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 express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef META_DATA_H_
18
19#define META_DATA_H_
20
21#include <sys/types.h>
22
23#include <stdint.h>
24
25#include <utils/RefBase.h>
26#include <utils/KeyedVector.h>
27
28namespace android {
29
30// The following keys map to int32_t data unless indicated otherwise.
31enum {
32    kKeyMIMEType          = 'mime',  // cstring
33    kKeyWidth             = 'widt',
34    kKeyHeight            = 'heig',
35    kKeyChannelCount      = '#chn',
36    kKeySampleRate        = 'srte',
37    kKeyBitRate           = 'brte',
38    kKeyESDS              = 'esds',  // raw data
39    kKeyAVCC              = 'avcc',  // raw data
40    kKeyWantsNALFragments = 'NALf',
41    kKeyIsSyncFrame       = 'sync',  // int32_t (bool)
42    kKeyIsCodecConfig     = 'conf',  // int32_t (bool)
43    kKeyTime              = 'time',  // int64_t (usecs)
44    kKeyDuration          = 'dura',  // int64_t (usecs)
45    kKeyColorFormat       = 'colf',
46    kKeyPlatformPrivate   = 'priv',  // pointer
47    kKeyDecoderComponent  = 'decC',  // cstring
48    kKeyBufferID          = 'bfID',
49    kKeyMaxInputSize      = 'inpS',
50    kKeyThumbnailTime     = 'thbT',  // int64_t (usecs)
51};
52
53enum {
54    kTypeESDS        = 'esds',
55    kTypeAVCC        = 'avcc',
56};
57
58class MetaData : public RefBase {
59public:
60    MetaData();
61    MetaData(const MetaData &from);
62
63    enum Type {
64        TYPE_NONE     = 'none',
65        TYPE_C_STRING = 'cstr',
66        TYPE_INT32    = 'in32',
67        TYPE_INT64    = 'in64',
68        TYPE_FLOAT    = 'floa',
69        TYPE_POINTER  = 'ptr ',
70    };
71
72    void clear();
73    bool remove(uint32_t key);
74
75    bool setCString(uint32_t key, const char *value);
76    bool setInt32(uint32_t key, int32_t value);
77    bool setInt64(uint32_t key, int64_t value);
78    bool setFloat(uint32_t key, float value);
79    bool setPointer(uint32_t key, void *value);
80
81    bool findCString(uint32_t key, const char **value);
82    bool findInt32(uint32_t key, int32_t *value);
83    bool findInt64(uint32_t key, int64_t *value);
84    bool findFloat(uint32_t key, float *value);
85    bool findPointer(uint32_t key, void **value);
86
87    bool setData(uint32_t key, uint32_t type, const void *data, size_t size);
88
89    bool findData(uint32_t key, uint32_t *type,
90                  const void **data, size_t *size) const;
91
92protected:
93    virtual ~MetaData();
94
95private:
96    struct typed_data {
97        typed_data();
98        ~typed_data();
99
100        typed_data(const MetaData::typed_data &);
101        typed_data &operator=(const MetaData::typed_data &);
102
103        void clear();
104        void setData(uint32_t type, const void *data, size_t size);
105        void getData(uint32_t *type, const void **data, size_t *size) const;
106
107    private:
108        uint32_t mType;
109        size_t mSize;
110
111        union {
112            void *ext_data;
113            float reservoir;
114        } u;
115
116        bool usesReservoir() const {
117            return mSize <= sizeof(u.reservoir);
118        }
119
120        void allocateStorage(size_t size);
121        void freeStorage();
122
123        void *storage() {
124            return usesReservoir() ? &u.reservoir : u.ext_data;
125        }
126
127        const void *storage() const {
128            return usesReservoir() ? &u.reservoir : u.ext_data;
129        }
130    };
131
132    KeyedVector<uint32_t, typed_data> mItems;
133
134    // MetaData &operator=(const MetaData &);
135};
136
137}  // namespace android
138
139#endif  // META_DATA_H_
140