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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 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 const char * 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