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      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 
     23 namespace android {
     24 
     25 class DataSource;
     26 class MediaSource;
     27 class MetaData;
     28 
     29 class MediaExtractor : public RefBase {
     30 public:
     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 
     69 protected:
     70     MediaExtractor() : mIsDrm(false) {}
     71     virtual ~MediaExtractor() {}
     72 
     73 private:
     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