1 /* 2 3 * Copyright (C) 2010 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 #ifndef MPEG2_TS_EXTRACTOR_H_ 19 20 #define MPEG2_TS_EXTRACTOR_H_ 21 22 #include <media/stagefright/foundation/ABase.h> 23 #include <media/MediaExtractor.h> 24 #include <media/MediaTrack.h> 25 #include <media/stagefright/MetaDataBase.h> 26 #include <utils/threads.h> 27 #include <utils/KeyedVector.h> 28 #include <utils/Vector.h> 29 30 #include "mpeg2ts/ATSParser.h" 31 32 namespace android { 33 34 struct AMessage; 35 struct AnotherPacketSource; 36 struct ATSParser; 37 class DataSourceBase; 38 struct MPEG2TSSource; 39 class String8; 40 41 struct MPEG2TSExtractor : public MediaExtractor { 42 explicit MPEG2TSExtractor(DataSourceBase *source); 43 44 virtual size_t countTracks(); 45 virtual MediaTrack *getTrack(size_t index); 46 virtual status_t getTrackMetaData(MetaDataBase &meta, size_t index, uint32_t flags); 47 48 virtual status_t getMetaData(MetaDataBase& meta); 49 50 virtual status_t setMediaCas(const uint8_t* /*casToken*/, size_t /*size*/) override; 51 52 virtual uint32_t flags() const; nameMPEG2TSExtractor53 virtual const char * name() { return "MPEG2TSExtractor"; } 54 55 private: 56 friend struct MPEG2TSSource; 57 58 mutable Mutex mLock; 59 60 DataSourceBase *mDataSource; 61 62 sp<ATSParser> mParser; 63 64 // Used to remember SyncEvent occurred in feedMore() when called from init(), 65 // because init() needs to update |mSourceImpls| before adding SyncPoint. 66 ATSParser::SyncEvent mLastSyncEvent; 67 68 Vector<sp<AnotherPacketSource> > mSourceImpls; 69 70 Vector<KeyedVector<int64_t, off64_t> > mSyncPoints; 71 // Sync points used for seeking --- normally one for video track is used. 72 // If no video track is present, audio track will be used instead. 73 KeyedVector<int64_t, off64_t> *mSeekSyncPoints; 74 75 off64_t mOffset; 76 77 static bool isScrambledFormat(MetaDataBase &format); 78 79 void init(); 80 void addSource(const sp<AnotherPacketSource> &impl); 81 // Try to feed more data from source to parser. 82 // |isInit| means this function is called inside init(). This is a signal to 83 // save SyncEvent so that init() can add SyncPoint after it updates |mSourceImpls|. 84 // This function returns OK if expected amount of data is fed from DataSourceBase to 85 // parser and is successfully parsed. Otherwise, various error codes could be 86 // returned, e.g., ERROR_END_OF_STREAM, or no data availalbe from DataSourceBase, or 87 // the data has syntax error during parsing, etc. 88 status_t feedMore(bool isInit = false); 89 status_t seek(int64_t seekTimeUs, 90 const MediaSource::ReadOptions::SeekMode& seekMode); 91 status_t queueDiscontinuityForSeek(int64_t actualSeekTimeUs); 92 status_t seekBeyond(int64_t seekTimeUs); 93 94 status_t feedUntilBufferAvailable(const sp<AnotherPacketSource> &impl); 95 96 // Add a SynPoint derived from |event|. 97 void addSyncPoint_l(const ATSParser::SyncEvent &event); 98 99 status_t estimateDurationsFromTimesUsAtEnd(); 100 101 DISALLOW_EVIL_CONSTRUCTORS(MPEG2TSExtractor); 102 }; 103 104 bool SniffMPEG2TS(DataSourceBase *source, float *confidence); 105 106 } // namespace android 107 108 #endif // MPEG2_TS_EXTRACTOR_H_ 109