MetaData.h revision 39ddf8e0f18766f7ba1e3246b774aa6ebd93eea8 
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',  // int32_t
34    kKeyHeight            = 'heig',  // int32_t
35    kKeyIFramesInterval   = 'ifiv',  // int32_t
36    kKeyStride            = 'strd',  // int32_t
37    kKeySliceHeight       = 'slht',  // int32_t
38    kKeyChannelCount      = '#chn',  // int32_t
39    kKeySampleRate        = 'srte',  // int32_t (also video frame rate)
40    kKeyBitRate           = 'brte',  // int32_t (bps)
41    kKeyESDS              = 'esds',  // raw data
42    kKeyAVCC              = 'avcc',  // raw data
43    kKeyVorbisInfo        = 'vinf',  // raw data
44    kKeyVorbisBooks       = 'vboo',  // raw data
45    kKeyWantsNALFragments = 'NALf',
46    kKeyIsSyncFrame       = 'sync',  // int32_t (bool)
47    kKeyIsCodecConfig     = 'conf',  // int32_t (bool)
48    kKeyTime              = 'time',  // int64_t (usecs)
49    kKeyNTPTime           = 'ntpT',  // uint64_t (ntp-timestamp)
50    kKeyTargetTime        = 'tarT',  // int64_t (usecs)
51    kKeyDuration          = 'dura',  // int64_t (usecs)
52    kKeyColorFormat       = 'colf',
53    kKeyPlatformPrivate   = 'priv',  // pointer
54    kKeyDecoderComponent  = 'decC',  // cstring
55    kKeyBufferID          = 'bfID',
56    kKeyMaxInputSize      = 'inpS',
57    kKeyThumbnailTime     = 'thbT',  // int64_t (usecs)
58
59    kKeyAlbum             = 'albu',  // cstring
60    kKeyArtist            = 'arti',  // cstring
61    kKeyAlbumArtist       = 'aart',  // cstring
62    kKeyComposer          = 'comp',  // cstring
63    kKeyGenre             = 'genr',  // cstring
64    kKeyTitle             = 'titl',  // cstring
65    kKeyYear              = 'year',  // cstring
66    kKeyAlbumArt          = 'albA',  // compressed image data
67    kKeyAlbumArtMIME      = 'alAM',  // cstring
68    kKeyAuthor            = 'auth',  // cstring
69    kKeyCDTrackNumber     = 'cdtr',  // cstring
70    kKeyDiscNumber        = 'dnum',  // cstring
71    kKeyDate              = 'date',  // cstring
72    kKeyWriter            = 'writ',  // cstring
73    kKeyTimeScale         = 'tmsl',  // int32_t
74
75    // video profile and level
76    kKeyVideoProfile      = 'vprf',  // int32_t
77    kKeyVideoLevel        = 'vlev',  // int32_t
78
79    // Set this key to enable authoring files in 64-bit offset
80    kKey64BitFileOffset   = 'fobt',  // int32_t (bool)
81
82    // Identify the file output format for authoring
83    // Please see <media/mediarecorder.h> for the supported
84    // file output formats.
85    kKeyFileType          = 'ftyp',  // int32_t
86
87    // Track authoring progress status
88    // kKeyTrackTimeStatus is used to track progress in elapsed time
89    // kKeyTrackFrameStatus is used to track progress in authored frames
90    kKeyTrackFrameStatus  = 'tkfm',  // int32_t
91    kKeyTrackTimeStatus   = 'tktm',  // int64_t
92
93};
94
95enum {
96    kTypeESDS        = 'esds',
97    kTypeAVCC        = 'avcc',
98};
99
100class MetaData : public RefBase {
101public:
102    MetaData();
103    MetaData(const MetaData &from);
104
105    enum Type {
106        TYPE_NONE     = 'none',
107        TYPE_C_STRING = 'cstr',
108        TYPE_INT32    = 'in32',
109        TYPE_INT64    = 'in64',
110        TYPE_FLOAT    = 'floa',
111        TYPE_POINTER  = 'ptr ',
112    };
113
114    void clear();
115    bool remove(uint32_t key);
116
117    bool setCString(uint32_t key, const char *value);
118    bool setInt32(uint32_t key, int32_t value);
119    bool setInt64(uint32_t key, int64_t value);
120    bool setFloat(uint32_t key, float value);
121    bool setPointer(uint32_t key, void *value);
122
123    bool findCString(uint32_t key, const char **value);
124    bool findInt32(uint32_t key, int32_t *value);
125    bool findInt64(uint32_t key, int64_t *value);
126    bool findFloat(uint32_t key, float *value);
127    bool findPointer(uint32_t key, void **value);
128
129    bool setData(uint32_t key, uint32_t type, const void *data, size_t size);
130
131    bool findData(uint32_t key, uint32_t *type,
132                  const void **data, size_t *size) const;
133
134protected:
135    virtual ~MetaData();
136
137private:
138    struct typed_data {
139        typed_data();
140        ~typed_data();
141
142        typed_data(const MetaData::typed_data &);
143        typed_data &operator=(const MetaData::typed_data &);
144
145        void clear();
146        void setData(uint32_t type, const void *data, size_t size);
147        void getData(uint32_t *type, const void **data, size_t *size) const;
148
149    private:
150        uint32_t mType;
151        size_t mSize;
152
153        union {
154            void *ext_data;
155            float reservoir;
156        } u;
157
158        bool usesReservoir() const {
159            return mSize <= sizeof(u.reservoir);
160        }
161
162        void allocateStorage(size_t size);
163        void freeStorage();
164
165        void *storage() {
166            return usesReservoir() ? &u.reservoir : u.ext_data;
167        }
168
169        const void *storage() const {
170            return usesReservoir() ? &u.reservoir : u.ext_data;
171        }
172    };
173
174    KeyedVector<uint32_t, typed_data> mItems;
175
176    // MetaData &operator=(const MetaData &);
177};
178
179}  // namespace android
180
181#endif  // META_DATA_H_
182