MetaData.h revision 7530e9c708275c273c134c36c68179f511c1940e 
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
30enum {
31    kKeyMIMEType          = 'mime',
32    kKeyWidth             = 'widt',
33    kKeyHeight            = 'heig',
34    kKeyChannelCount      = '#chn',
35    kKeySampleRate        = 'srte',
36    kKeyBitRate           = 'brte',
37    kKeyESDS              = 'esds',
38    kKeyAVCC              = 'avcc',
39    kKeyTimeUnits         = '#tim',
40    kKeyTimeScale         = 'scal',
41    kKeyWantsNALFragments = 'NALf',
42    kKeyIsSyncFrame       = 'sync',
43    kKeyDuration          = 'dura',
44    kKeyColorFormat       = 'colf',
45    kKeyPlatformPrivate   = 'priv',
46    kKeyDecoderComponent  = 'decC',
47    kKeyBufferID          = 'bfID',
48    kKeyCompressedSize    = 'cmpS',
49};
50
51enum {
52    kTypeESDS        = 'esds',
53    kTypeAVCC        = 'avcc',
54};
55
56class MetaData : public RefBase {
57public:
58    MetaData();
59    MetaData(const MetaData &from);
60
61    enum Type {
62        TYPE_NONE     = 'none',
63        TYPE_C_STRING = 'cstr',
64        TYPE_INT32    = 'in32',
65        TYPE_FLOAT    = 'floa',
66        TYPE_POINTER  = 'ptr ',
67    };
68
69    void clear();
70    bool remove(uint32_t key);
71
72    bool setCString(uint32_t key, const char *value);
73    bool setInt32(uint32_t key, int32_t value);
74    bool setFloat(uint32_t key, float value);
75    bool setPointer(uint32_t key, void *value);
76
77    bool findCString(uint32_t key, const char **value);
78    bool findInt32(uint32_t key, int32_t *value);
79    bool findFloat(uint32_t key, float *value);
80    bool findPointer(uint32_t key, void **value);
81
82    bool setData(uint32_t key, uint32_t type, const void *data, size_t size);
83
84    bool findData(uint32_t key, uint32_t *type,
85                  const void **data, size_t *size) const;
86
87protected:
88    virtual ~MetaData();
89
90private:
91    struct typed_data {
92        typed_data();
93        ~typed_data();
94
95        typed_data(const MetaData::typed_data &);
96        typed_data &operator=(const MetaData::typed_data &);
97
98        void clear();
99        void setData(uint32_t type, const void *data, size_t size);
100        void getData(uint32_t *type, const void **data, size_t *size) const;
101
102    private:
103        uint32_t mType;
104        size_t mSize;
105
106        union {
107            void *ext_data;
108            float reservoir;
109        } u;
110
111        bool usesReservoir() const {
112            return mSize <= sizeof(u.reservoir);
113        }
114
115        void allocateStorage(size_t size);
116        void freeStorage();
117
118        void *storage() {
119            return usesReservoir() ? &u.reservoir : u.ext_data;
120        }
121
122        const void *storage() const {
123            return usesReservoir() ? &u.reservoir : u.ext_data;
124        }
125    };
126
127    KeyedVector<uint32_t, typed_data> mItems;
128
129    // MetaData &operator=(const MetaData &);
130};
131
132}  // namespace android
133
134#endif  // META_DATA_H_
135