MediaExtractor.h revision dcd25efb46c41c8d24a0a9cf61fb57f84149709e 
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 MEDIA_EXTRACTOR_H_
18
19#define MEDIA_EXTRACTOR_H_
20
21#include <utils/RefBase.h>
22
23namespace android {
24
25class DataSource;
26class MediaSource;
27class MetaData;
28
29class MediaExtractor : public RefBase {
30public:
31    static sp<MediaExtractor> Create(
32            const sp<DataSource> &source, const char *mime = NULL);
33
34    virtual size_t countTracks() = 0;
35    virtual sp<MediaSource> getTrack(size_t index) = 0;
36
37    enum GetTrackMetaDataFlags {
38        kIncludeExtensiveMetaData = 1
39    };
40    virtual sp<MetaData> getTrackMetaData(
41            size_t index, uint32_t flags = 0) = 0;
42
43    // Return container specific meta-data. The default implementation
44    // returns an empty metadata object.
45    virtual sp<MetaData> getMetaData();
46
47    enum Flags {
48        CAN_SEEK_BACKWARD  = 1,
49        CAN_SEEK_FORWARD   = 2,
50        CAN_PAUSE          = 4,
51    };
52
53    // If subclasses do _not_ override this, the default is
54    // CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD | CAN_PAUSE
55    virtual uint32_t flags() const;
56
57    // for DRM
58    virtual void setDrmFlag(bool flag) {};
59    virtual char* getDrmTrackInfo(size_t trackID, int *len) {
60        return NULL;
61    }
62
63protected:
64    MediaExtractor() {}
65    virtual ~MediaExtractor() {}
66
67private:
68    MediaExtractor(const MediaExtractor &);
69    MediaExtractor &operator=(const MediaExtractor &);
70};
71
72}  // namespace android
73
74#endif  // MEDIA_EXTRACTOR_H_
75