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