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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 <list>
     21 #include <media/mediaplayer.h>
     22 #include <media/stagefright/foundation/ABase.h>
     23 #include <media/IMediaExtractor.h>
     24 #include <media/MediaSource.h>
     25 #include <utils/Errors.h>
     26 #include <utils/KeyedVector.h>
     27 #include <utils/RefBase.h>
     28 #include <utils/String8.h>
     29 #include <utils/threads.h>
     30 #include <utils/Vector.h>
     31 
     32 namespace android {
     33 
     34 struct ABuffer;
     35 struct AMessage;
     36 class DataSource;
     37 struct MediaHTTPService;
     38 class MediaBuffer;
     39 class MediaExtractor;
     40 struct MediaSource;
     41 class MetaData;
     42 
     43 struct NuMediaExtractor : public RefBase {
     44     enum SampleFlags {
     45         SAMPLE_FLAG_SYNC        = 1,
     46         SAMPLE_FLAG_ENCRYPTED   = 2,
     47     };
     48 
     49     // identical to IMediaExtractor::GetTrackMetaDataFlags
     50     enum GetTrackFormatFlags {
     51         kIncludeExtensiveMetaData = 1, // reads sample table and possibly stream headers
     52     };
     53 
     54     NuMediaExtractor();
     55 
     56     status_t setDataSource(
     57             const sp<MediaHTTPService> &httpService,
     58             const char *path,
     59             const KeyedVector<String8, String8> *headers = NULL);
     60 
     61     status_t setDataSource(int fd, off64_t offset, off64_t size);
     62 
     63     status_t setDataSource(const sp<DataSource> &datasource);
     64 
     65     status_t setMediaCas(const HInterfaceToken &casToken);
     66 
     67     void disconnect();
     68 
     69     size_t countTracks() const;
     70     status_t getTrackFormat(size_t index, sp<AMessage> *format, uint32_t flags = 0) const;
     71 
     72     status_t getFileFormat(sp<AMessage> *format) const;
     73 
     74     status_t getExifOffsetSize(off64_t *offset, size_t *size) const;
     75 
     76     status_t selectTrack(size_t index, int64_t startTimeUs = -1ll,
     77             MediaSource::ReadOptions::SeekMode mode =
     78                 MediaSource::ReadOptions::SEEK_CLOSEST_SYNC);
     79     status_t unselectTrack(size_t index);
     80 
     81     status_t seekTo(
     82             int64_t timeUs,
     83             MediaSource::ReadOptions::SeekMode mode =
     84                 MediaSource::ReadOptions::SEEK_CLOSEST_SYNC);
     85 
     86     // Each selected track has a read pointer.
     87     // advance() advances the read pointer with the lowest timestamp.
     88     status_t advance();
     89     // readSampleData() reads the sample with the lowest timestamp.
     90     status_t readSampleData(const sp<ABuffer> &buffer);
     91 
     92     status_t getSampleSize(size_t *sampleSize);
     93     status_t getSampleTrackIndex(size_t *trackIndex);
     94     status_t getSampleTime(int64_t *sampleTimeUs);
     95     status_t getSampleMeta(sp<MetaData> *sampleMeta);
     96     status_t getMetrics(Parcel *reply);
     97 
     98     bool getCachedDuration(int64_t *durationUs, bool *eos) const;
     99 
    100 protected:
    101     virtual ~NuMediaExtractor();
    102 
    103 private:
    104     enum TrackFlags {
    105         kIsVorbis       = 1,
    106     };
    107 
    108     enum {
    109         kMaxTrackCount = 16384,
    110     };
    111 
    112     struct Sample {
    113         Sample();
    114         Sample(MediaBufferBase *buffer, int64_t timeUs);
    115         MediaBufferBase *mBuffer;
    116         int64_t mSampleTimeUs;
    117     };
    118 
    119     struct TrackInfo {
    120         sp<IMediaSource> mSource;
    121         size_t mTrackIndex;
    122         media_track_type mTrackType;
    123         size_t mMaxFetchCount;
    124         status_t mFinalResult;
    125         std::list<Sample> mSamples;
    126 
    127         uint32_t mTrackFlags;  // bitmask of "TrackFlags"
    128     };
    129 
    130     mutable Mutex mLock;
    131 
    132     sp<DataSource> mDataSource;
    133 
    134     sp<IMediaExtractor> mImpl;
    135     HInterfaceToken mCasToken;
    136 
    137     Vector<TrackInfo> mSelectedTracks;
    138     int64_t mTotalBitrate;  // in bits/sec
    139     int64_t mDurationUs;
    140 
    141     ssize_t fetchAllTrackSamples(
    142             int64_t seekTimeUs = -1ll,
    143             MediaSource::ReadOptions::SeekMode mode =
    144                 MediaSource::ReadOptions::SEEK_CLOSEST_SYNC);
    145     void fetchTrackSamples(
    146             TrackInfo *info,
    147             int64_t seekTimeUs = -1ll,
    148             MediaSource::ReadOptions::SeekMode mode =
    149                 MediaSource::ReadOptions::SEEK_CLOSEST_SYNC);
    150 
    151     void releaseOneSample(TrackInfo *info);
    152     void releaseTrackSamples(TrackInfo *info);
    153     void releaseAllTrackSamples();
    154 
    155     bool getTotalBitrate(int64_t *bitRate) const;
    156     status_t updateDurationAndBitrate();
    157     status_t appendVorbisNumPageSamples(MediaBufferBase *mbuf, const sp<ABuffer> &buffer);
    158 
    159     DISALLOW_EVIL_CONSTRUCTORS(NuMediaExtractor);
    160 };
    161 
    162 }  // namespace android
    163 
    164 #endif  // NU_MEDIA_EXTRACTOR_H_
    165 
    166