MediaExtractor.h revision bb983e5b4640555533241753f4a8e4b48331ed1d 
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,  // the "seek 10secs back button"
49        CAN_SEEK_FORWARD   = 2,  // the "seek 10secs forward button"
50        CAN_PAUSE          = 4,
51        CAN_SEEK           = 8,  // the "seek bar"
52    };
53
54    // If subclasses do _not_ override this, the default is
55    // CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD | CAN_SEEK | CAN_PAUSE
56    virtual uint32_t flags() const;
57
58    // for DRM
59    void setDrmFlag(bool flag) {
60        mIsDrm = flag;
61    };
62    bool getDrmFlag() {
63        return mIsDrm;
64    }
65    virtual char* getDrmTrackInfo(size_t trackID, int *len) {
66        return NULL;
67    }
68
69protected:
70    MediaExtractor() : mIsDrm(false) {}
71    virtual ~MediaExtractor() {}
72
73private:
74    bool mIsDrm;
75
76    MediaExtractor(const MediaExtractor &);
77    MediaExtractor &operator=(const MediaExtractor &);
78};
79
80}  // namespace android
81
82#endif  // MEDIA_EXTRACTOR_H_
83