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      1 /*
      2  * Copyright 2012, 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 NU_MEDIA_EXTRACTOR_H_
     18 #define NU_MEDIA_EXTRACTOR_H_
     19 
     20 #include <media/stagefright/foundation/ABase.h>
     21 #include <media/stagefright/MediaSource.h>
     22 #include <utils/Errors.h>
     23 #include <utils/KeyedVector.h>
     24 #include <utils/RefBase.h>
     25 #include <utils/String8.h>
     26 #include <utils/threads.h>
     27 #include <utils/Vector.h>
     28 
     29 namespace android {
     30 
     31 struct ABuffer;
     32 struct AMessage;
     33 struct DataSource;
     34 struct MediaBuffer;
     35 struct MediaExtractor;
     36 struct MediaSource;
     37 struct MetaData;
     38 
     39 struct NuMediaExtractor : public RefBase {
     40     enum SampleFlags {
     41         SAMPLE_FLAG_SYNC        = 1,
     42         SAMPLE_FLAG_ENCRYPTED   = 2,
     43     };
     44 
     45     NuMediaExtractor();
     46 
     47     status_t setDataSource(
     48             const char *path,
     49             const KeyedVector<String8, String8> *headers = NULL);
     50 
     51     status_t setDataSource(int fd, off64_t offset, off64_t size);
     52 
     53     status_t setDataSource(const sp<DataSource> &datasource);
     54 
     55     size_t countTracks() const;
     56     status_t getTrackFormat(size_t index, sp<AMessage> *format) const;
     57 
     58     status_t getFileFormat(sp<AMessage> *format) const;
     59 
     60     status_t selectTrack(size_t index);
     61     status_t unselectTrack(size_t index);
     62 
     63     status_t seekTo(
     64             int64_t timeUs,
     65             MediaSource::ReadOptions::SeekMode mode =
     66                 MediaSource::ReadOptions::SEEK_CLOSEST_SYNC);
     67 
     68     status_t advance();
     69     status_t readSampleData(const sp<ABuffer> &buffer);
     70     status_t getSampleTrackIndex(size_t *trackIndex);
     71     status_t getSampleTime(int64_t *sampleTimeUs);
     72     status_t getSampleMeta(sp<MetaData> *sampleMeta);
     73 
     74     bool getCachedDuration(int64_t *durationUs, bool *eos) const;
     75 
     76 protected:
     77     virtual ~NuMediaExtractor();
     78 
     79 private:
     80     enum TrackFlags {
     81         kIsVorbis       = 1,
     82     };
     83 
     84     struct TrackInfo {
     85         sp<MediaSource> mSource;
     86         size_t mTrackIndex;
     87         status_t mFinalResult;
     88         MediaBuffer *mSample;
     89         int64_t mSampleTimeUs;
     90 
     91         uint32_t mTrackFlags;  // bitmask of "TrackFlags"
     92     };
     93 
     94     mutable Mutex mLock;
     95 
     96     sp<DataSource> mDataSource;
     97 
     98     sp<MediaExtractor> mImpl;
     99     bool mIsWidevineExtractor;
    100 
    101     Vector<TrackInfo> mSelectedTracks;
    102     int64_t mTotalBitrate;  // in bits/sec
    103     int64_t mDurationUs;
    104 
    105     ssize_t fetchTrackSamples(
    106             int64_t seekTimeUs = -1ll,
    107             MediaSource::ReadOptions::SeekMode mode =
    108                 MediaSource::ReadOptions::SEEK_CLOSEST_SYNC);
    109 
    110     void releaseTrackSamples();
    111 
    112     bool getTotalBitrate(int64_t *bitRate) const;
    113     void updateDurationAndBitrate();
    114 
    115     DISALLOW_EVIL_CONSTRUCTORS(NuMediaExtractor);
    116 };
    117 
    118 }  // namespace android
    119 
    120 #endif  // NU_MEDIA_EXTRACTOR_H_
    121 
    122