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 IMEDIA_EXTRACTOR_BASE_H_
18 
19 #define IMEDIA_EXTRACTOR_BASE_H_
20 
21 #include <media/DataSource.h>
22 #include <media/IMediaSource.h>
23 #include <vector>
24 
25 namespace android {
26 
27 class MetaData;
28 typedef std::vector<uint8_t> HInterfaceToken;
29 
30 class IMediaExtractor : public IInterface {
31 public:
32     DECLARE_META_INTERFACE(MediaExtractor);
33 
34     virtual size_t countTracks() = 0;
35     // This function could return NULL IMediaSource even when index is within the
36     // track count returned by countTracks, since it's possible the track is malformed
37     // and it's not detected during countTracks call.
38     virtual sp<IMediaSource> getTrack(size_t index) = 0;
39 
40     enum GetTrackMetaDataFlags {
41         kIncludeExtensiveMetaData = 1
42     };
43     virtual sp<MetaData> getTrackMetaData(
44             size_t index, uint32_t flags = 0) = 0;
45 
46     // Return container specific meta-data. The default implementation
47     // returns an empty metadata object.
48     virtual sp<MetaData> getMetaData() = 0;
49 
50     virtual status_t getMetrics(Parcel *reply) = 0;
51 
52     enum Flags {
53         CAN_SEEK_BACKWARD  = 1,  // the "seek 10secs back button"
54         CAN_SEEK_FORWARD   = 2,  // the "seek 10secs forward button"
55         CAN_PAUSE          = 4,
56         CAN_SEEK           = 8,  // the "seek bar"
57     };
58 
59     // If subclasses do _not_ override this, the default is
60     // CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD | CAN_SEEK | CAN_PAUSE
61     virtual uint32_t flags() const = 0;
62 
63     virtual status_t setMediaCas(const HInterfaceToken &casToken) = 0;
64 
65     virtual String8 name() = 0;
66 };
67 
68 
69 class BnMediaExtractor: public BnInterface<IMediaExtractor>
70 {
71 public:
72     virtual status_t    onTransact(uint32_t code, const Parcel& data, Parcel* reply,
73                                 uint32_t flags = 0);
74 };
75 
76 void registerMediaExtractor(
77         const sp<IMediaExtractor> &extractor,
78         const sp<DataSource> &source,
79         const char *mime);
80 
81 void registerMediaSource(
82         const sp<IMediaExtractor> &extractor,
83         const sp<IMediaSource> &source);
84 
85 status_t dumpExtractors(int fd, const Vector<String16>& args);
86 
87 
88 }  // namespace android
89 
90 #endif  // IMEDIA_EXTRACTOR_BASE_H_
91