1 /* 2 * Copyright (C) 2009 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 MPEG4_WRITER_H_ 18 19 #define MPEG4_WRITER_H_ 20 21 #include <stdio.h> 22 23 #include <media/stagefright/MediaWriter.h> 24 #include <utils/List.h> 25 #include <utils/threads.h> 26 27 namespace android { 28 29 class MediaBuffer; 30 class MediaSource; 31 class MetaData; 32 33 class MPEG4Writer : public MediaWriter { 34 public: 35 MPEG4Writer(const char *filename); 36 MPEG4Writer(int fd); 37 38 virtual status_t addSource(const sp<MediaSource> &source); 39 virtual status_t start(MetaData *param = NULL); 40 virtual status_t stop(); 41 virtual status_t pause(); 42 virtual bool reachedEOS(); 43 virtual status_t dump(int fd, const Vector<String16>& args); 44 45 void beginBox(const char *fourcc); 46 void writeInt8(int8_t x); 47 void writeInt16(int16_t x); 48 void writeInt32(int32_t x); 49 void writeInt64(int64_t x); 50 void writeCString(const char *s); 51 void writeFourcc(const char *fourcc); 52 void write(const void *data, size_t size); 53 void endBox(); 54 uint32_t interleaveDuration() const { return mInterleaveDurationUs; } 55 status_t setInterleaveDuration(uint32_t duration); 56 int32_t getTimeScale() const { return mTimeScale; } 57 58 status_t setGeoData(int latitudex10000, int longitudex10000); 59 void setStartTimeOffsetMs(int ms) { mStartTimeOffsetMs = ms; } 60 int32_t getStartTimeOffsetMs() const { return mStartTimeOffsetMs; } 61 62 protected: 63 virtual ~MPEG4Writer(); 64 65 private: 66 class Track; 67 68 int mFd; 69 status_t mInitCheck; 70 bool mUse4ByteNalLength; 71 bool mUse32BitOffset; 72 bool mIsFileSizeLimitExplicitlyRequested; 73 bool mPaused; 74 bool mStarted; // Writer thread + track threads started successfully 75 bool mWriterThreadStarted; // Only writer thread started successfully 76 off64_t mOffset; 77 off_t mMdatOffset; 78 uint8_t *mMoovBoxBuffer; 79 off64_t mMoovBoxBufferOffset; 80 bool mWriteMoovBoxToMemory; 81 off64_t mFreeBoxOffset; 82 bool mStreamableFile; 83 off64_t mEstimatedMoovBoxSize; 84 uint32_t mInterleaveDurationUs; 85 int32_t mTimeScale; 86 int64_t mStartTimestampUs; 87 int mLatitudex10000; 88 int mLongitudex10000; 89 bool mAreGeoTagsAvailable; 90 int32_t mStartTimeOffsetMs; 91 92 Mutex mLock; 93 94 List<Track *> mTracks; 95 96 List<off64_t> mBoxes; 97 98 void setStartTimestampUs(int64_t timeUs); 99 int64_t getStartTimestampUs(); // Not const 100 status_t startTracks(MetaData *params); 101 size_t numTracks(); 102 int64_t estimateMoovBoxSize(int32_t bitRate); 103 104 struct Chunk { 105 Track *mTrack; // Owner 106 int64_t mTimeStampUs; // Timestamp of the 1st sample 107 List<MediaBuffer *> mSamples; // Sample data 108 109 // Convenient constructor 110 Chunk(): mTrack(NULL), mTimeStampUs(0) {} 111 112 Chunk(Track *track, int64_t timeUs, List<MediaBuffer *> samples) 113 : mTrack(track), mTimeStampUs(timeUs), mSamples(samples) { 114 } 115 116 }; 117 struct ChunkInfo { 118 Track *mTrack; // Owner 119 List<Chunk> mChunks; // Remaining chunks to be written 120 121 // Previous chunk timestamp that has been written 122 int64_t mPrevChunkTimestampUs; 123 124 // Max time interval between neighboring chunks 125 int64_t mMaxInterChunkDurUs; 126 127 }; 128 129 bool mIsFirstChunk; 130 volatile bool mDone; // Writer thread is done? 131 pthread_t mThread; // Thread id for the writer 132 List<ChunkInfo> mChunkInfos; // Chunk infos 133 Condition mChunkReadyCondition; // Signal that chunks are available 134 135 // Writer thread handling 136 status_t startWriterThread(); 137 void stopWriterThread(); 138 static void *ThreadWrapper(void *me); 139 void threadFunc(); 140 141 // Buffer a single chunk to be written out later. 142 void bufferChunk(const Chunk& chunk); 143 144 // Write all buffered chunks from all tracks 145 void writeAllChunks(); 146 147 // Retrieve the proper chunk to write if there is one 148 // Return true if a chunk is found; otherwise, return false. 149 bool findChunkToWrite(Chunk *chunk); 150 151 // Actually write the given chunk to the file. 152 void writeChunkToFile(Chunk* chunk); 153 154 // Adjust other track media clock (presumably wall clock) 155 // based on audio track media clock with the drift time. 156 int64_t mDriftTimeUs; 157 void setDriftTimeUs(int64_t driftTimeUs); 158 int64_t getDriftTimeUs(); 159 160 // Return whether the nal length is 4 bytes or 2 bytes 161 // Only makes sense for H.264/AVC 162 bool useNalLengthFour(); 163 164 void lock(); 165 void unlock(); 166 167 // Acquire lock before calling these methods 168 off64_t addSample_l(MediaBuffer *buffer); 169 off64_t addLengthPrefixedSample_l(MediaBuffer *buffer); 170 171 inline size_t write(const void *ptr, size_t size, size_t nmemb); 172 bool exceedsFileSizeLimit(); 173 bool use32BitFileOffset() const; 174 bool exceedsFileDurationLimit(); 175 bool isFileStreamable() const; 176 void trackProgressStatus(size_t trackId, int64_t timeUs, status_t err = OK); 177 void writeCompositionMatrix(int32_t degrees); 178 void writeMvhdBox(int64_t durationUs); 179 void writeMoovBox(int64_t durationUs); 180 void writeFtypBox(MetaData *param); 181 void writeUdtaBox(); 182 void writeGeoDataBox(); 183 void writeLatitude(int degreex10000); 184 void writeLongitude(int degreex10000); 185 void sendSessionSummary(); 186 void release(); 187 188 MPEG4Writer(const MPEG4Writer &); 189 MPEG4Writer &operator=(const MPEG4Writer &); 190 }; 191 192 } // namespace android 193 194 #endif // MPEG4_WRITER_H_ 195
