1 /* 2 * Copyright (C) 2010 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 MPEG2_TS_EXTRACTOR_H_ 18 19 #define MPEG2_TS_EXTRACTOR_H_ 20 21 #include <media/stagefright/foundation/ABase.h> 22 #include <media/stagefright/MediaExtractor.h> 23 #include <media/stagefright/MediaSource.h> 24 #include <utils/threads.h> 25 #include <utils/KeyedVector.h> 26 #include <utils/Vector.h> 27 28 #include "mpeg2ts/ATSParser.h" 29 30 namespace android { 31 32 struct AMessage; 33 struct AnotherPacketSource; 34 struct ATSParser; 35 class DataSource; 36 struct MPEG2TSSource; 37 class String8; 38 39 struct MPEG2TSExtractor : public MediaExtractor { 40 explicit MPEG2TSExtractor(const sp<DataSource> &source); 41 42 virtual size_t countTracks(); 43 virtual sp<IMediaSource> getTrack(size_t index); 44 virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags); 45 46 virtual sp<MetaData> getMetaData(); 47 48 virtual status_t setMediaCas(const sp<ICas> &cas) override; 49 50 virtual uint32_t flags() const; nameMPEG2TSExtractor51 virtual const char * name() { return "MPEG2TSExtractor"; } 52 53 private: 54 friend struct MPEG2TSSource; 55 56 mutable Mutex mLock; 57 58 sp<DataSource> mDataSource; 59 60 sp<ATSParser> mParser; 61 62 // Used to remember SyncEvent occurred in feedMore() when called from init(), 63 // because init() needs to update |mSourceImpls| before adding SyncPoint. 64 ATSParser::SyncEvent mLastSyncEvent; 65 66 Vector<sp<AnotherPacketSource> > mSourceImpls; 67 68 Vector<KeyedVector<int64_t, off64_t> > mSyncPoints; 69 // Sync points used for seeking --- normally one for video track is used. 70 // If no video track is present, audio track will be used instead. 71 KeyedVector<int64_t, off64_t> *mSeekSyncPoints; 72 73 off64_t mOffset; 74 75 static bool isScrambledFormat(const sp<MetaData> &format); 76 77 void init(); 78 void addSource(const sp<AnotherPacketSource> &impl); 79 // Try to feed more data from source to parser. 80 // |isInit| means this function is called inside init(). This is a signal to 81 // save SyncEvent so that init() can add SyncPoint after it updates |mSourceImpls|. 82 // This function returns OK if expected amount of data is fed from DataSource to 83 // parser and is successfully parsed. Otherwise, various error codes could be 84 // returned, e.g., ERROR_END_OF_STREAM, or no data availalbe from DataSource, or 85 // the data has syntax error during parsing, etc. 86 status_t feedMore(bool isInit = false); 87 status_t seek(int64_t seekTimeUs, 88 const MediaSource::ReadOptions::SeekMode& seekMode); 89 status_t queueDiscontinuityForSeek(int64_t actualSeekTimeUs); 90 status_t seekBeyond(int64_t seekTimeUs); 91 92 status_t feedUntilBufferAvailable(const sp<AnotherPacketSource> &impl); 93 94 // Add a SynPoint derived from |event|. 95 void addSyncPoint_l(const ATSParser::SyncEvent &event); 96 97 status_t estimateDurationsFromTimesUsAtEnd(); 98 99 DISALLOW_EVIL_CONSTRUCTORS(MPEG2TSExtractor); 100 }; 101 102 bool SniffMPEG2TS( 103 const sp<DataSource> &source, String8 *mimeType, float *confidence, 104 sp<AMessage> *); 105 106 } // namespace android 107 108 #endif // MPEG2_TS_EXTRACTOR_H_ 109