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* Copyright (C) 2009 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#ifndef MPEG4_WRITER_H_
#define MPEG4_WRITER_H_
#include <stdio.h>
#include <media/IMediaSource.h>
#include <media/stagefright/MediaWriter.h>
#include <utils/List.h>
#include <utils/threads.h>
#include <media/stagefright/foundation/AHandlerReflector.h>
#include <media/stagefright/foundation/ALooper.h>
namespace android {
class AMessage;
class MediaBuffer;
class MetaData;
class MPEG4Writer : public MediaWriter {
MPEG4Writer(int fd);
// Limitations
// No more than one video and/or one audio source can be added, but
// multiple metadata sources can be added.
virtual status_t addSource(const sp<IMediaSource> &source);
// Returns INVALID_OPERATION if there is no source or track.
virtual status_t start(MetaData *param = NULL);
virtual status_t stop() { return reset(); }
virtual status_t pause();
virtual bool reachedEOS();
virtual status_t dump(int fd, const Vector<String16>& args);
void beginBox(const char *fourcc);
void beginBox(uint32_t id);
void writeInt8(int8_t x);
void writeInt16(int16_t x);
void writeInt32(int32_t x);
void writeInt64(int64_t x);
void writeCString(const char *s);
void writeFourcc(const char *fourcc);
void write(const void *data, size_t size);
inline size_t write(const void *ptr, size_t size, size_t nmemb);
void endBox();
uint32_t interleaveDuration() const { return mInterleaveDurationUs; }
status_t setInterleaveDuration(uint32_t duration);
int32_t getTimeScale() const { return mTimeScale; }
status_t setGeoData(int latitudex10000, int longitudex10000);
status_t setCaptureRate(float captureFps);
status_t setTemporalLayerCount(uint32_t layerCount);
void notifyApproachingLimit();
virtual void setStartTimeOffsetMs(int ms) { mStartTimeOffsetMs = ms; }
virtual int32_t getStartTimeOffsetMs() const { return mStartTimeOffsetMs; }
virtual status_t setNextFd(int fd);
virtual ~MPEG4Writer();
class Track;
friend struct AHandlerReflector<MPEG4Writer>;
enum {
kWhatSwitch = 'swch',
int mFd;
int mNextFd;
sp<MetaData> mStartMeta;
status_t mInitCheck;
bool mIsRealTimeRecording;
bool mUse4ByteNalLength;
bool mUse32BitOffset;
bool mIsFileSizeLimitExplicitlyRequested;
bool mPaused;
bool mStarted; // Writer thread + track threads started successfully
bool mWriterThreadStarted; // Only writer thread started successfully
bool mSendNotify;
off64_t mOffset;
off_t mMdatOffset;
uint8_t *mMoovBoxBuffer;
off64_t mMoovBoxBufferOffset;
bool mWriteMoovBoxToMemory;
off64_t mFreeBoxOffset;
bool mStreamableFile;
off64_t mEstimatedMoovBoxSize;
off64_t mMoovExtraSize;
uint32_t mInterleaveDurationUs;
int32_t mTimeScale;
int64_t mStartTimestampUs;
int mLatitudex10000;
int mLongitudex10000;
bool mAreGeoTagsAvailable;
int32_t mStartTimeOffsetMs;
bool mSwitchPending;
sp<ALooper> mLooper;
sp<AHandlerReflector<MPEG4Writer> > mReflector;
Mutex mLock;
List<Track *> mTracks;
List<off64_t> mBoxes;
sp<AMessage> mMetaKeys;
void setStartTimestampUs(int64_t timeUs);
int64_t getStartTimestampUs(); // Not const
status_t startTracks(MetaData *params);
size_t numTracks();
int64_t estimateMoovBoxSize(int32_t bitRate);
struct Chunk {
Track *mTrack; // Owner
int64_t mTimeStampUs; // Timestamp of the 1st sample
List<MediaBuffer *> mSamples; // Sample data
// Convenient constructor
Chunk(): mTrack(NULL), mTimeStampUs(0) {}
Chunk(Track *track, int64_t timeUs, List<MediaBuffer *> samples)
: mTrack(track), mTimeStampUs(timeUs), mSamples(samples) {
struct ChunkInfo {
Track *mTrack; // Owner
List<Chunk> mChunks; // Remaining chunks to be written
// Previous chunk timestamp that has been written
int64_t mPrevChunkTimestampUs;
// Max time interval between neighboring chunks
int64_t mMaxInterChunkDurUs;
bool mIsFirstChunk;
volatile bool mDone; // Writer thread is done?
pthread_t mThread; // Thread id for the writer
List<ChunkInfo> mChunkInfos; // Chunk infos
Condition mChunkReadyCondition; // Signal that chunks are available
// Writer thread handling
status_t startWriterThread();
void stopWriterThread();
static void *ThreadWrapper(void *me);
void threadFunc();
// Buffer a single chunk to be written out later.
void bufferChunk(const Chunk& chunk);
// Write all buffered chunks from all tracks
void writeAllChunks();
// Retrieve the proper chunk to write if there is one
// Return true if a chunk is found; otherwise, return false.
bool findChunkToWrite(Chunk *chunk);
// Actually write the given chunk to the file.
void writeChunkToFile(Chunk* chunk);
// Adjust other track media clock (presumably wall clock)
// based on audio track media clock with the drift time.
int64_t mDriftTimeUs;
void setDriftTimeUs(int64_t driftTimeUs);
int64_t getDriftTimeUs();
// Return whether the nal length is 4 bytes or 2 bytes
// Only makes sense for H.264/AVC
bool useNalLengthFour();
// Return whether the writer is used for real time recording.
// In real time recording mode, new samples will be allowed to buffered into
// chunks in higher priority thread, even though the file writer has not
// drained the chunks yet.
// By default, real time recording is on.
bool isRealTimeRecording() const;
void lock();
void unlock();
void initInternal(int fd);
// Acquire lock before calling these methods
off64_t addSample_l(MediaBuffer *buffer);
off64_t addLengthPrefixedSample_l(MediaBuffer *buffer);
off64_t addMultipleLengthPrefixedSamples_l(MediaBuffer *buffer);
bool exceedsFileSizeLimit();
bool use32BitFileOffset() const;
bool exceedsFileDurationLimit();
bool approachingFileSizeLimit();
bool isFileStreamable() const;
void trackProgressStatus(size_t trackId, int64_t timeUs, status_t err = OK);
void writeCompositionMatrix(int32_t degrees);
void writeMvhdBox(int64_t durationUs);
void writeMoovBox(int64_t durationUs);
void writeFtypBox(MetaData *param);
void writeUdtaBox();
void writeGeoDataBox();
void writeLatitude(int degreex10000);
void writeLongitude(int degreex10000);
void finishCurrentSession();
void addDeviceMeta();
void writeHdlr();
void writeKeys();
void writeIlst();
void writeMetaBox();
void sendSessionSummary();
void release();
status_t switchFd();
status_t reset(bool stopSource = true);
static uint32_t getMpeg4Time();
void onMessageReceived(const sp<AMessage> &msg);
MPEG4Writer(const MPEG4Writer &);
MPEG4Writer &operator=(const MPEG4Writer &);
} // namespace android
#endif // MPEG4_WRITER_H_