MetaData.h revision e9810fae2ca6620337b75a787786cc0ea52adecd 
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#include <utils/String8.h>
28
29namespace android {
30
31// The following keys map to int32_t data unless indicated otherwise.
32enum {
33    kKeyMIMEType          = 'mime',  // cstring
34    kKeyWidth             = 'widt',  // int32_t, image pixel
35    kKeyHeight            = 'heig',  // int32_t, image pixel
36    kKeyDisplayWidth      = 'dWid',  // int32_t, display/presentation
37    kKeyDisplayHeight     = 'dHgt',  // int32_t, display/presentation
38    kKeySARWidth          = 'sarW',  // int32_t, sampleAspectRatio width
39    kKeySARHeight         = 'sarH',  // int32_t, sampleAspectRatio height
40
41    // a rectangle, if absent assumed to be (0, 0, width - 1, height - 1)
42    kKeyCropRect          = 'crop',
43
44    kKeyRotation          = 'rotA',  // int32_t (angle in degrees)
45    kKeyIFramesInterval   = 'ifiv',  // int32_t
46    kKeyStride            = 'strd',  // int32_t
47    kKeySliceHeight       = 'slht',  // int32_t
48    kKeyChannelCount      = '#chn',  // int32_t
49    kKeyChannelMask       = 'chnm',  // int32_t
50    kKeySampleRate        = 'srte',  // int32_t (audio sampling rate Hz)
51    kKeyFrameRate         = 'frmR',  // int32_t (video frame rate fps)
52    kKeyBitRate           = 'brte',  // int32_t (bps)
53    kKeyESDS              = 'esds',  // raw data
54    kKeyAACProfile        = 'aacp',  // int32_t
55    kKeyAVCC              = 'avcc',  // raw data
56    kKeyD263              = 'd263',  // raw data
57    kKeyVorbisInfo        = 'vinf',  // raw data
58    kKeyVorbisBooks       = 'vboo',  // raw data
59    kKeyWantsNALFragments = 'NALf',
60    kKeyIsSyncFrame       = 'sync',  // int32_t (bool)
61    kKeyIsCodecConfig     = 'conf',  // int32_t (bool)
62    kKeyTime              = 'time',  // int64_t (usecs)
63    kKeyDecodingTime      = 'decT',  // int64_t (decoding timestamp in usecs)
64    kKeyNTPTime           = 'ntpT',  // uint64_t (ntp-timestamp)
65    kKeyTargetTime        = 'tarT',  // int64_t (usecs)
66    kKeyDriftTime         = 'dftT',  // int64_t (usecs)
67    kKeyAnchorTime        = 'ancT',  // int64_t (usecs)
68    kKeyDuration          = 'dura',  // int64_t (usecs)
69    kKeyColorFormat       = 'colf',
70    kKeyPlatformPrivate   = 'priv',  // pointer
71    kKeyDecoderComponent  = 'decC',  // cstring
72    kKeyBufferID          = 'bfID',
73    kKeyMaxInputSize      = 'inpS',
74    kKeyThumbnailTime     = 'thbT',  // int64_t (usecs)
75    kKeyTrackID           = 'trID',
76    kKeyIsDRM             = 'idrm',  // int32_t (bool)
77    kKeyEncoderDelay      = 'encd',  // int32_t (frames)
78    kKeyEncoderPadding    = 'encp',  // int32_t (frames)
79
80    kKeyAlbum             = 'albu',  // cstring
81    kKeyArtist            = 'arti',  // cstring
82    kKeyAlbumArtist       = 'aart',  // cstring
83    kKeyComposer          = 'comp',  // cstring
84    kKeyGenre             = 'genr',  // cstring
85    kKeyTitle             = 'titl',  // cstring
86    kKeyYear              = 'year',  // cstring
87    kKeyAlbumArt          = 'albA',  // compressed image data
88    kKeyAlbumArtMIME      = 'alAM',  // cstring
89    kKeyAuthor            = 'auth',  // cstring
90    kKeyCDTrackNumber     = 'cdtr',  // cstring
91    kKeyDiscNumber        = 'dnum',  // cstring
92    kKeyDate              = 'date',  // cstring
93    kKeyWriter            = 'writ',  // cstring
94    kKeyCompilation       = 'cpil',  // cstring
95    kKeyLocation          = 'loc ',  // cstring
96    kKeyTimeScale         = 'tmsl',  // int32_t
97
98    // video profile and level
99    kKeyVideoProfile      = 'vprf',  // int32_t
100    kKeyVideoLevel        = 'vlev',  // int32_t
101
102    // Set this key to enable authoring files in 64-bit offset
103    kKey64BitFileOffset   = 'fobt',  // int32_t (bool)
104    kKey2ByteNalLength    = '2NAL',  // int32_t (bool)
105
106    // Identify the file output format for authoring
107    // Please see <media/mediarecorder.h> for the supported
108    // file output formats.
109    kKeyFileType          = 'ftyp',  // int32_t
110
111    // Track authoring progress status
112    // kKeyTrackTimeStatus is used to track progress in elapsed time
113    kKeyTrackTimeStatus   = 'tktm',  // int64_t
114
115    kKeyNotRealTime       = 'ntrt',  // bool (int32_t)
116    kKeyNumBuffers        = 'nbbf',  // int32_t
117
118    // Ogg files can be tagged to be automatically looping...
119    kKeyAutoLoop          = 'autL',  // bool (int32_t)
120
121    kKeyValidSamples      = 'valD',  // int32_t
122
123    kKeyIsUnreadable      = 'unre',  // bool (int32_t)
124
125    // An indication that a video buffer has been rendered.
126    kKeyRendered          = 'rend',  // bool (int32_t)
127
128    // The language code for this media
129    kKeyMediaLanguage     = 'lang',  // cstring
130
131    // To store the timed text format data
132    kKeyTextFormatData    = 'text',  // raw data
133
134    kKeyRequiresSecureBuffers = 'secu',  // bool (int32_t)
135
136    kKeyIsADTS            = 'adts',  // bool (int32_t)
137
138    // If a MediaBuffer's data represents (at least partially) encrypted
139    // data, the following fields aid in decryption.
140    // The data can be thought of as pairs of plain and encrypted data
141    // fragments, i.e. plain and encrypted data alternate.
142    // The first fragment is by convention plain data (if that's not the
143    // case, simply specify plain fragment size of 0).
144    // kKeyEncryptedSizes and kKeyPlainSizes each map to an array of
145    // size_t values. The sum total of all size_t values of both arrays
146    // must equal the amount of data (i.e. MediaBuffer's range_length()).
147    // If both arrays are present, they must be of the same size.
148    // If only encrypted sizes are present it is assumed that all
149    // plain sizes are 0, i.e. all fragments are encrypted.
150    // To programmatically set these array, use the MetaData::setData API, i.e.
151    // const size_t encSizes[];
152    // meta->setData(
153    //  kKeyEncryptedSizes, 0 /* type */, encSizes, sizeof(encSizes));
154    // A plain sizes array by itself makes no sense.
155    kKeyEncryptedSizes    = 'encr',  // size_t[]
156    kKeyPlainSizes        = 'plai',  // size_t[]
157    kKeyCryptoKey         = 'cryK',  // uint8_t[16]
158    kKeyCryptoIV          = 'cryI',  // uint8_t[16]
159    kKeyCryptoMode        = 'cryM',  // int32_t
160};
161
162enum {
163    kTypeESDS        = 'esds',
164    kTypeAVCC        = 'avcc',
165    kTypeD263        = 'd263',
166};
167
168class MetaData : public RefBase {
169public:
170    MetaData();
171    MetaData(const MetaData &from);
172
173    enum Type {
174        TYPE_NONE     = 'none',
175        TYPE_C_STRING = 'cstr',
176        TYPE_INT32    = 'in32',
177        TYPE_INT64    = 'in64',
178        TYPE_FLOAT    = 'floa',
179        TYPE_POINTER  = 'ptr ',
180        TYPE_RECT     = 'rect',
181    };
182
183    void clear();
184    bool remove(uint32_t key);
185
186    bool setCString(uint32_t key, const char *value);
187    bool setInt32(uint32_t key, int32_t value);
188    bool setInt64(uint32_t key, int64_t value);
189    bool setFloat(uint32_t key, float value);
190    bool setPointer(uint32_t key, void *value);
191
192    bool setRect(
193            uint32_t key,
194            int32_t left, int32_t top,
195            int32_t right, int32_t bottom);
196
197    bool findCString(uint32_t key, const char **value);
198    bool findInt32(uint32_t key, int32_t *value);
199    bool findInt64(uint32_t key, int64_t *value);
200    bool findFloat(uint32_t key, float *value);
201    bool findPointer(uint32_t key, void **value);
202
203    bool findRect(
204            uint32_t key,
205            int32_t *left, int32_t *top,
206            int32_t *right, int32_t *bottom);
207
208    bool setData(uint32_t key, uint32_t type, const void *data, size_t size);
209
210    bool findData(uint32_t key, uint32_t *type,
211                  const void **data, size_t *size) const;
212
213    void dumpToLog() const;
214
215protected:
216    virtual ~MetaData();
217
218private:
219    struct typed_data {
220        typed_data();
221        ~typed_data();
222
223        typed_data(const MetaData::typed_data &);
224        typed_data &operator=(const MetaData::typed_data &);
225
226        void clear();
227        void setData(uint32_t type, const void *data, size_t size);
228        void getData(uint32_t *type, const void **data, size_t *size) const;
229        String8 asString() const;
230
231    private:
232        uint32_t mType;
233        size_t mSize;
234
235        union {
236            void *ext_data;
237            float reservoir;
238        } u;
239
240        bool usesReservoir() const {
241            return mSize <= sizeof(u.reservoir);
242        }
243
244        void allocateStorage(size_t size);
245        void freeStorage();
246
247        void *storage() {
248            return usesReservoir() ? &u.reservoir : u.ext_data;
249        }
250
251        const void *storage() const {
252            return usesReservoir() ? &u.reservoir : u.ext_data;
253        }
254    };
255
256    struct Rect {
257        int32_t mLeft, mTop, mRight, mBottom;
258    };
259
260    KeyedVector<uint32_t, typed_data> mItems;
261
262    // MetaData &operator=(const MetaData &);
263};
264
265}  // namespace android
266
267#endif  // META_DATA_H_
268