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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/stagefright/MediaWriter.h>
#include <utils/List.h>
#include <utils/threads.h>
namespace android {
class MediaBuffer;
class MediaSource;
class MetaData;
class MPEG4Writer : public MediaWriter {
MPEG4Writer(const char *filename);
MPEG4Writer(int fd);
virtual status_t addSource(const sp<MediaSource> &source);
virtual status_t start(MetaData *param = NULL);
virtual status_t stop();
virtual status_t pause();
virtual bool reachedEOS();
virtual status_t dump(int fd, const Vector<String16>& args);
void beginBox(const char *fourcc);
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);
void endBox();
uint32_t interleaveDuration() const { return mInterleaveDurationUs; }
status_t setInterleaveDuration(uint32_t duration);
int32_t getTimeScale() const { return mTimeScale; }
virtual ~MPEG4Writer();
class Track;
FILE *mFile;
bool mUse4ByteNalLength;
bool mUse32BitOffset;
bool mIsFileSizeLimitExplicitlyRequested;
bool mPaused;
bool mStarted;
off_t mOffset;
off_t mMdatOffset;
uint8_t *mMoovBoxBuffer;
off_t mMoovBoxBufferOffset;
bool mWriteMoovBoxToMemory;
off_t mFreeBoxOffset;
bool mStreamableFile;
off_t mEstimatedMoovBoxSize;
uint32_t mInterleaveDurationUs;
int32_t mTimeScale;
int64_t mStartTimestampUs;
Mutex mLock;
List<Track *> mTracks;
List<off_t> mBoxes;
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(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
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 writeChunks();
// Write a chunk if there is one
status_t writeOneChunk();
// Write the first chunk from the given ChunkInfo.
void writeFirstChunk(ChunkInfo* info);
// 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();
void lock();
void unlock();
// Acquire lock before calling these methods
off_t addSample_l(MediaBuffer *buffer);
off_t addLengthPrefixedSample_l(MediaBuffer *buffer);
inline size_t write(const void *ptr, size_t size, size_t nmemb, FILE* stream);
bool exceedsFileSizeLimit();
bool use32BitFileOffset() const;
bool exceedsFileDurationLimit();
bool isFileStreamable() const;
void trackProgressStatus(const Track* track, int64_t timeUs, status_t err = OK);
void writeCompositionMatrix(int32_t degrees);
MPEG4Writer(const MPEG4Writer &);
MPEG4Writer &operator=(const MPEG4Writer &);
} // namespace android
#endif // MPEG4_WRITER_H_