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 AMR_EXTRACTOR_H_
18 
19 #define AMR_EXTRACTOR_H_
20 
21 #include <utils/Errors.h>
22 #include <media/stagefright/MediaExtractor.h>
23 
24 namespace android {
25 
26 struct AMessage;
27 class String8;
28 #define OFFSET_TABLE_LEN    300
29 
30 class AMRExtractor : public MediaExtractor {
31 public:
32     AMRExtractor(const sp<DataSource> &source);
33 
34     virtual size_t countTracks();
35     virtual sp<MediaSource> getTrack(size_t index);
36     virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
37 
38     virtual sp<MetaData> getMetaData();
39 
40 protected:
41     virtual ~AMRExtractor();
42 
43 private:
44     sp<DataSource> mDataSource;
45     sp<MetaData> mMeta;
46     status_t mInitCheck;
47     bool mIsWide;
48 
49     off64_t mOffsetTable[OFFSET_TABLE_LEN]; //5 min
50     size_t mOffsetTableLength;
51 
52     AMRExtractor(const AMRExtractor &);
53     AMRExtractor &operator=(const AMRExtractor &);
54 };
55 
56 bool SniffAMR(
57         const sp<DataSource> &source, String8 *mimeType, float *confidence,
58         sp<AMessage> *);
59 
60 }  // namespace android
61 
62 #endif  // AMR_EXTRACTOR_H_
63