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MPEG4Writer.cpp
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MPEG4Writer.cpp
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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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "MPEG4Writer"
#include <utils/Log.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <media/stagefright/MPEG4Writer.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MetaData.h>
#include <media/stagefright/MediaDebug.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/MediaSource.h>
#include <media/stagefright/Utils.h>
#include <media/mediarecorder.h>
#include "include/ESDS.h"
namespace android {
static const int64_t kMax32BitFileSize = 0x007fffffffLL;
static const uint8_t kNalUnitTypeSeqParamSet = 0x07;
static const uint8_t kNalUnitTypePicParamSet = 0x08;
// Using longer adjustment period to suppress fluctuations in
// the audio encoding paths
static const int64_t kVideoMediaTimeAdjustPeriodTimeUs = 600000000LL; // 10 minutes
class MPEG4Writer::Track {
public:
Track(MPEG4Writer *owner, const sp<MediaSource> &source);
~Track();
status_t start(MetaData *params);
status_t stop();
status_t pause();
bool reachedEOS();
int64_t getDurationUs() const;
int64_t getEstimatedTrackSizeBytes() const;
void writeTrackHeader(int32_t trackID, bool use32BitOffset = true);
void bufferChunk(int64_t timestampUs);
bool isAvc() const { return mIsAvc; }
bool isAudio() const { return mIsAudio; }
bool isMPEG4() const { return mIsMPEG4; }
void addChunkOffset(off_t offset);
status_t dump(int fd, const Vector<String16>& args) const;
private:
MPEG4Writer *mOwner;
sp<MetaData> mMeta;
sp<MediaSource> mSource;
volatile bool mDone;
volatile bool mPaused;
volatile bool mResumed;
bool mIsAvc;
bool mIsAudio;
bool mIsMPEG4;
int64_t mTrackDurationUs;
// For realtime applications, we need to adjust the media clock
// for video track based on the audio media clock
bool mIsRealTimeRecording;
int64_t mMaxTimeStampUs;
int64_t mEstimatedTrackSizeBytes;
int64_t mMdatSizeBytes;
int32_t mTimeScale;
pthread_t mThread;
// mNumSamples is used to track how many samples in mSampleSizes List.
// This is to reduce the cost associated with mSampleSizes.size() call,
// since it is O(n). Ideally, the fix should be in List class.
size_t mNumSamples;
List<size_t> mSampleSizes;
bool mSamplesHaveSameSize;
List<MediaBuffer *> mChunkSamples;
size_t mNumStcoTableEntries;
List<off_t> mChunkOffsets;
size_t mNumStscTableEntries;
struct StscTableEntry {
StscTableEntry(uint32_t chunk, uint32_t samples, uint32_t id)
: firstChunk(chunk),
samplesPerChunk(samples),
sampleDescriptionId(id) {}
uint32_t firstChunk;
uint32_t samplesPerChunk;
uint32_t sampleDescriptionId;
};
List<StscTableEntry> mStscTableEntries;
size_t mNumStssTableEntries;
List<int32_t> mStssTableEntries;
size_t mNumSttsTableEntries;
struct SttsTableEntry {
SttsTableEntry(uint32_t count, uint32_t durationUs)
: sampleCount(count), sampleDurationUs(durationUs) {}
uint32_t sampleCount;
uint32_t sampleDurationUs;
};
List<SttsTableEntry> mSttsTableEntries;
// Sequence parameter set or picture parameter set
struct AVCParamSet {
AVCParamSet(uint16_t length, const uint8_t *data)
: mLength(length), mData(data) {}
uint16_t mLength;
const uint8_t *mData;
};
List<AVCParamSet> mSeqParamSets;
List<AVCParamSet> mPicParamSets;
uint8_t mProfileIdc;
uint8_t mProfileCompatible;
uint8_t mLevelIdc;
void *mCodecSpecificData;
size_t mCodecSpecificDataSize;
bool mGotAllCodecSpecificData;
bool mTrackingProgressStatus;
bool mReachedEOS;
int64_t mStartTimestampUs;
int64_t mPreviousTrackTimeUs;
int64_t mTrackEveryTimeDurationUs;
// Has the media time adjustment for video started?
bool mIsMediaTimeAdjustmentOn;
// The time stamp when previous media time adjustment period starts
int64_t mPrevMediaTimeAdjustTimestampUs;
// Number of vidoe frames whose time stamp may be adjusted
int64_t mMediaTimeAdjustNumFrames;
// The sample number when previous meida time adjustmnet period starts
int64_t mPrevMediaTimeAdjustSample;
// The total accumulated drift time within a period of
// kVideoMediaTimeAdjustPeriodTimeUs.
int64_t mTotalDriftTimeToAdjustUs;
// The total accumalated drift time since the start of the recording
// excluding the current time adjustment period
int64_t mPrevTotalAccumDriftTimeUs;
// Update the audio track's drift information.
void updateDriftTime(const sp<MetaData>& meta);
// Adjust the time stamp of the video track according to
// the drift time information from the audio track.
void adjustMediaTime(int64_t *timestampUs);
static void *ThreadWrapper(void *me);
status_t threadEntry();
const uint8_t *parseParamSet(
const uint8_t *data, size_t length, int type, size_t *paramSetLen);
status_t makeAVCCodecSpecificData(
const uint8_t *data, size_t size);
status_t copyAVCCodecSpecificData(
const uint8_t *data, size_t size);
status_t parseAVCCodecSpecificData(
const uint8_t *data, size_t size);
// Track authoring progress status
void trackProgressStatus(int64_t timeUs, status_t err = OK);
void initTrackingProgressStatus(MetaData *params);
void getCodecSpecificDataFromInputFormatIfPossible();
// Determine the track time scale
// If it is an audio track, try to use the sampling rate as
// the time scale; however, if user chooses the overwrite
// value, the user-supplied time scale will be used.
void setTimeScale();
// Simple validation on the codec specific data
status_t checkCodecSpecificData() const;
int32_t mRotation;
void updateTrackSizeEstimate();
void addOneStscTableEntry(size_t chunkId, size_t sampleId);
void addOneStssTableEntry(size_t sampleId);
void addOneSttsTableEntry(size_t sampleCount, int64_t durationUs);
Track(const Track &);
Track &operator=(const Track &);
};
MPEG4Writer::MPEG4Writer(const char *filename)
: mFile(fopen(filename, "wb")),
mUse4ByteNalLength(true),
mUse32BitOffset(true),
mIsFileSizeLimitExplicitlyRequested(false),
mPaused(false),
mStarted(false),
mOffset(0),
mMdatOffset(0),
mEstimatedMoovBoxSize(0),
mInterleaveDurationUs(1000000) {
CHECK(mFile != NULL);
}
MPEG4Writer::MPEG4Writer(int fd)
: mFile(fdopen(fd, "wb")),
mUse4ByteNalLength(true),
mUse32BitOffset(true),
mIsFileSizeLimitExplicitlyRequested(false),
mPaused(false),
mStarted(false),
mOffset(0),
mMdatOffset(0),
mEstimatedMoovBoxSize(0),
mInterleaveDurationUs(1000000) {
CHECK(mFile != NULL);
}
MPEG4Writer::~MPEG4Writer() {
stop();
while (!mTracks.empty()) {
List<Track *>::iterator it = mTracks.begin();
delete *it;
(*it) = NULL;
mTracks.erase(it);
}
mTracks.clear();
}
status_t MPEG4Writer::dump(
int fd, const Vector<String16>& args) {
const size_t SIZE = 256;
char buffer[SIZE];
String8 result;
snprintf(buffer, SIZE, " MPEG4Writer %p\n", this);
result.append(buffer);
snprintf(buffer, SIZE, " mStarted: %s\n", mStarted? "true": "false");
result.append(buffer);
::write(fd, result.string(), result.size());
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
(*it)->dump(fd, args);
}
return OK;
}
status_t MPEG4Writer::Track::dump(
int fd, const Vector<String16>& args) const {
const size_t SIZE = 256;
char buffer[SIZE];
String8 result;
snprintf(buffer, SIZE, " %s track\n", mIsAudio? "Audio": "Video");
result.append(buffer);
snprintf(buffer, SIZE, " reached EOS: %s\n",
mReachedEOS? "true": "false");
result.append(buffer);
::write(fd, result.string(), result.size());
return OK;
}
status_t MPEG4Writer::addSource(const sp<MediaSource> &source) {
Track *track = new Track(this, source);
mTracks.push_back(track);
return OK;
}
status_t MPEG4Writer::startTracks(MetaData *params) {
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
status_t err = (*it)->start(params);
if (err != OK) {
for (List<Track *>::iterator it2 = mTracks.begin();
it2 != it; ++it2) {
(*it2)->stop();
}
return err;
}
}
return OK;
}
int64_t MPEG4Writer::estimateMoovBoxSize(int32_t bitRate) {
// This implementation is highly experimental/heurisitic.
//
// Statistical analysis shows that metadata usually accounts
// for a small portion of the total file size, usually < 0.6%.
// The default MIN_MOOV_BOX_SIZE is set to 0.6% x 1MB / 2,
// where 1MB is the common file size limit for MMS application.
// The default MAX _MOOV_BOX_SIZE value is based on about 3
// minute video recording with a bit rate about 3 Mbps, because
// statistics also show that most of the video captured are going
// to be less than 3 minutes.
// If the estimation is wrong, we will pay the price of wasting
// some reserved space. This should not happen so often statistically.
static const int32_t factor = mUse32BitOffset? 1: 2;
static const int64_t MIN_MOOV_BOX_SIZE = 3 * 1024; // 3 KB
static const int64_t MAX_MOOV_BOX_SIZE = (180 * 3000000 * 6LL / 8000);
int64_t size = MIN_MOOV_BOX_SIZE;
// Max file size limit is set
if (mMaxFileSizeLimitBytes != 0 && mIsFileSizeLimitExplicitlyRequested) {
size = mMaxFileSizeLimitBytes * 6 / 1000;
}
// Max file duration limit is set
if (mMaxFileDurationLimitUs != 0) {
if (bitRate > 0) {
int64_t size2 =
((mMaxFileDurationLimitUs * bitRate * 6) / 1000 / 8000000);
if (mMaxFileSizeLimitBytes != 0 && mIsFileSizeLimitExplicitlyRequested) {
// When both file size and duration limits are set,
// we use the smaller limit of the two.
if (size > size2) {
size = size2;
}
} else {
// Only max file duration limit is set
size = size2;
}
}
}
if (size < MIN_MOOV_BOX_SIZE) {
size = MIN_MOOV_BOX_SIZE;
}
// Any long duration recording will be probably end up with
// non-streamable mp4 file.
if (size > MAX_MOOV_BOX_SIZE) {
size = MAX_MOOV_BOX_SIZE;
}
LOGI("limits: %lld/%lld bytes/us, bit rate: %d bps and the estimated"
" moov size %lld bytes",
mMaxFileSizeLimitBytes, mMaxFileDurationLimitUs, bitRate, size);
return factor * size;
}
status_t MPEG4Writer::start(MetaData *param) {
if (mFile == NULL) {
return UNKNOWN_ERROR;
}
/*
* Check mMaxFileSizeLimitBytes at the beginning
* since mMaxFileSizeLimitBytes may be implicitly
* changed later for 32-bit file offset even if
* user does not ask to set it explicitly.
*/
if (mMaxFileSizeLimitBytes != 0) {
mIsFileSizeLimitExplicitlyRequested = true;
}
int32_t use64BitOffset;
if (param &&
param->findInt32(kKey64BitFileOffset, &use64BitOffset) &&
use64BitOffset) {
mUse32BitOffset = false;
}
if (mUse32BitOffset) {
// Implicit 32 bit file size limit
if (mMaxFileSizeLimitBytes == 0) {
mMaxFileSizeLimitBytes = kMax32BitFileSize;
}
// If file size is set to be larger than the 32 bit file
// size limit, treat it as an error.
if (mMaxFileSizeLimitBytes > kMax32BitFileSize) {
LOGW("32-bit file size limit (%lld bytes) too big. "
"It is changed to %lld bytes",
mMaxFileSizeLimitBytes, kMax32BitFileSize);
mMaxFileSizeLimitBytes = kMax32BitFileSize;
}
}
int32_t use2ByteNalLength;
if (param &&
param->findInt32(kKey2ByteNalLength, &use2ByteNalLength) &&
use2ByteNalLength) {
mUse4ByteNalLength = false;
}
mStartTimestampUs = -1;
if (mStarted) {
if (mPaused) {
mPaused = false;
return startTracks(param);
}
return OK;
}
if (!param ||
!param->findInt32(kKeyTimeScale, &mTimeScale)) {
mTimeScale = 1000;
}
CHECK(mTimeScale > 0);
LOGV("movie time scale: %d", mTimeScale);
mStreamableFile = true;
mWriteMoovBoxToMemory = false;
mMoovBoxBuffer = NULL;
mMoovBoxBufferOffset = 0;
beginBox("ftyp");
{
int32_t fileType;
if (param && param->findInt32(kKeyFileType, &fileType) &&
fileType != OUTPUT_FORMAT_MPEG_4) {
writeFourcc("3gp4");
} else {
writeFourcc("isom");
}
}
writeInt32(0);
writeFourcc("isom");
writeFourcc("3gp4");
endBox();
mFreeBoxOffset = mOffset;
if (mEstimatedMoovBoxSize == 0) {
int32_t bitRate = -1;
if (param) {
param->findInt32(kKeyBitRate, &bitRate);
}
mEstimatedMoovBoxSize = estimateMoovBoxSize(bitRate);
}
CHECK(mEstimatedMoovBoxSize >= 8);
fseeko(mFile, mFreeBoxOffset, SEEK_SET);
writeInt32(mEstimatedMoovBoxSize);
write("free", 4);
mMdatOffset = mFreeBoxOffset + mEstimatedMoovBoxSize;
mOffset = mMdatOffset;
fseeko(mFile, mMdatOffset, SEEK_SET);
if (mUse32BitOffset) {
write("????mdat", 8);
} else {
write("\x00\x00\x00\x01mdat????????", 16);
}
status_t err = startWriterThread();
if (err != OK) {
return err;
}
err = startTracks(param);
if (err != OK) {
return err;
}
mStarted = true;
return OK;
}
bool MPEG4Writer::use32BitFileOffset() const {
return mUse32BitOffset;
}
status_t MPEG4Writer::pause() {
if (mFile == NULL) {
return OK;
}
mPaused = true;
status_t err = OK;
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
status_t status = (*it)->pause();
if (status != OK) {
err = status;
}
}
return err;
}
void MPEG4Writer::stopWriterThread() {
LOGV("stopWriterThread");
{
Mutex::Autolock autolock(mLock);
mDone = true;
mChunkReadyCondition.signal();
}
void *dummy;
pthread_join(mThread, &dummy);
}
/*
* MP4 file standard defines a composition matrix:
* | a b u |
* | c d v |
* | x y w |
*
* the element in the matrix is stored in the following
* order: {a, b, u, c, d, v, x, y, w},
* where a, b, c, d, x, and y is in 16.16 format, while
* u, v and w is in 2.30 format.
*/
void MPEG4Writer::writeCompositionMatrix(int degrees) {
LOGV("writeCompositionMatrix");
uint32_t a = 0x00010000;
uint32_t b = 0;
uint32_t c = 0;
uint32_t d = 0x00010000;
switch (degrees) {
case 0:
break;
case 90:
a = 0;
b = 0x00010000;
c = 0xFFFF0000;
d = 0;
break;
case 180:
a = 0xFFFF0000;
d = 0xFFFF0000;
break;
case 270:
a = 0;
b = 0xFFFF0000;
c = 0x00010000;
d = 0;
break;
default:
CHECK(!"Should never reach this unknown rotation");
break;
}
writeInt32(a); // a
writeInt32(b); // b
writeInt32(0); // u
writeInt32(c); // c
writeInt32(d); // d
writeInt32(0); // v
writeInt32(0); // x
writeInt32(0); // y
writeInt32(0x40000000); // w
}
status_t MPEG4Writer::stop() {
if (mFile == NULL) {
return OK;
}
status_t err = OK;
int64_t maxDurationUs = 0;
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
status_t status = (*it)->stop();
if (err == OK && status != OK) {
err = status;
}
int64_t durationUs = (*it)->getDurationUs();
if (durationUs > maxDurationUs) {
maxDurationUs = durationUs;
}
}
stopWriterThread();
// Do not write out movie header on error.
if (err != OK) {
fflush(mFile);
fclose(mFile);
mFile = NULL;
mStarted = false;
return err;
}
// Fix up the size of the 'mdat' chunk.
if (mUse32BitOffset) {
fseeko(mFile, mMdatOffset, SEEK_SET);
int32_t size = htonl(static_cast<int32_t>(mOffset - mMdatOffset));
fwrite(&size, 1, 4, mFile);
} else {
fseeko(mFile, mMdatOffset + 8, SEEK_SET);
int64_t size = mOffset - mMdatOffset;
size = hton64(size);
fwrite(&size, 1, 8, mFile);
}
fseeko(mFile, mOffset, SEEK_SET);
time_t now = time(NULL);
const off_t moovOffset = mOffset;
mWriteMoovBoxToMemory = true;
mMoovBoxBuffer = (uint8_t *) malloc(mEstimatedMoovBoxSize);
mMoovBoxBufferOffset = 0;
CHECK(mMoovBoxBuffer != NULL);
int32_t duration = (maxDurationUs * mTimeScale + 5E5) / 1E6;
beginBox("moov");
beginBox("mvhd");
writeInt32(0); // version=0, flags=0
writeInt32(now); // creation time
writeInt32(now); // modification time
writeInt32(mTimeScale); // mvhd timescale
writeInt32(duration);
writeInt32(0x10000); // rate: 1.0
writeInt16(0x100); // volume
writeInt16(0); // reserved
writeInt32(0); // reserved
writeInt32(0); // reserved
writeCompositionMatrix(0);
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(0); // predefined
writeInt32(mTracks.size() + 1); // nextTrackID
endBox(); // mvhd
int32_t id = 1;
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it, ++id) {
(*it)->writeTrackHeader(id, mUse32BitOffset);
}
endBox(); // moov
mWriteMoovBoxToMemory = false;
if (mStreamableFile) {
CHECK(mMoovBoxBufferOffset + 8 <= mEstimatedMoovBoxSize);
// Moov box
fseeko(mFile, mFreeBoxOffset, SEEK_SET);
mOffset = mFreeBoxOffset;
write(mMoovBoxBuffer, 1, mMoovBoxBufferOffset, mFile);
// Free box
fseeko(mFile, mOffset, SEEK_SET);
writeInt32(mEstimatedMoovBoxSize - mMoovBoxBufferOffset);
write("free", 4);
// Free temp memory
free(mMoovBoxBuffer);
mMoovBoxBuffer = NULL;
mMoovBoxBufferOffset = 0;
} else {
LOGI("The mp4 file will not be streamable.");
}
CHECK(mBoxes.empty());
fflush(mFile);
fclose(mFile);
mFile = NULL;
mStarted = false;
return err;
}
status_t MPEG4Writer::setInterleaveDuration(uint32_t durationUs) {
mInterleaveDurationUs = durationUs;
return OK;
}
void MPEG4Writer::lock() {
mLock.lock();
}
void MPEG4Writer::unlock() {
mLock.unlock();
}
off_t MPEG4Writer::addSample_l(MediaBuffer *buffer) {
off_t old_offset = mOffset;
fwrite((const uint8_t *)buffer->data() + buffer->range_offset(),
1, buffer->range_length(), mFile);
mOffset += buffer->range_length();
return old_offset;
}
static void StripStartcode(MediaBuffer *buffer) {
if (buffer->range_length() < 4) {
return;
}
const uint8_t *ptr =
(const uint8_t *)buffer->data() + buffer->range_offset();
if (!memcmp(ptr, "\x00\x00\x00\x01", 4)) {
buffer->set_range(
buffer->range_offset() + 4, buffer->range_length() - 4);
}
}
off_t MPEG4Writer::addLengthPrefixedSample_l(MediaBuffer *buffer) {
off_t old_offset = mOffset;
size_t length = buffer->range_length();
if (mUse4ByteNalLength) {
uint8_t x = length >> 24;
fwrite(&x, 1, 1, mFile);
x = (length >> 16) & 0xff;
fwrite(&x, 1, 1, mFile);
x = (length >> 8) & 0xff;
fwrite(&x, 1, 1, mFile);
x = length & 0xff;
fwrite(&x, 1, 1, mFile);
fwrite((const uint8_t *)buffer->data() + buffer->range_offset(),
1, length, mFile);
mOffset += length + 4;
} else {
CHECK(length < 65536);
uint8_t x = length >> 8;
fwrite(&x, 1, 1, mFile);
x = length & 0xff;
fwrite(&x, 1, 1, mFile);
fwrite((const uint8_t *)buffer->data() + buffer->range_offset(),
1, length, mFile);
mOffset += length + 2;
}
return old_offset;
}
size_t MPEG4Writer::write(
const void *ptr, size_t size, size_t nmemb, FILE *stream) {
const size_t bytes = size * nmemb;
if (mWriteMoovBoxToMemory) {
off_t moovBoxSize = 8 + mMoovBoxBufferOffset + bytes;
if (moovBoxSize > mEstimatedMoovBoxSize) {
for (List<off_t>::iterator it = mBoxes.begin();
it != mBoxes.end(); ++it) {
(*it) += mOffset;
}
fseeko(mFile, mOffset, SEEK_SET);
fwrite(mMoovBoxBuffer, 1, mMoovBoxBufferOffset, stream);
fwrite(ptr, size, nmemb, stream);
mOffset += (bytes + mMoovBoxBufferOffset);
free(mMoovBoxBuffer);
mMoovBoxBuffer = NULL;
mMoovBoxBufferOffset = 0;
mWriteMoovBoxToMemory = false;
mStreamableFile = false;
} else {
memcpy(mMoovBoxBuffer + mMoovBoxBufferOffset, ptr, bytes);
mMoovBoxBufferOffset += bytes;
}
} else {
fwrite(ptr, size, nmemb, stream);
mOffset += bytes;
}
return bytes;
}
void MPEG4Writer::beginBox(const char *fourcc) {
CHECK_EQ(strlen(fourcc), 4);
mBoxes.push_back(mWriteMoovBoxToMemory?
mMoovBoxBufferOffset: mOffset);
writeInt32(0);
writeFourcc(fourcc);
}
void MPEG4Writer::endBox() {
CHECK(!mBoxes.empty());
off_t offset = *--mBoxes.end();
mBoxes.erase(--mBoxes.end());
if (mWriteMoovBoxToMemory) {
int32_t x = htonl(mMoovBoxBufferOffset - offset);
memcpy(mMoovBoxBuffer + offset, &x, 4);
} else {
fseeko(mFile, offset, SEEK_SET);
writeInt32(mOffset - offset);
mOffset -= 4;
fseeko(mFile, mOffset, SEEK_SET);
}
}
void MPEG4Writer::writeInt8(int8_t x) {
write(&x, 1, 1, mFile);
}
void MPEG4Writer::writeInt16(int16_t x) {
x = htons(x);
write(&x, 1, 2, mFile);
}
void MPEG4Writer::writeInt32(int32_t x) {
x = htonl(x);
write(&x, 1, 4, mFile);
}
void MPEG4Writer::writeInt64(int64_t x) {
x = hton64(x);
write(&x, 1, 8, mFile);
}
void MPEG4Writer::writeCString(const char *s) {
size_t n = strlen(s);
write(s, 1, n + 1, mFile);
}
void MPEG4Writer::writeFourcc(const char *s) {
CHECK_EQ(strlen(s), 4);
write(s, 1, 4, mFile);
}
void MPEG4Writer::write(const void *data, size_t size) {
write(data, 1, size, mFile);
}
bool MPEG4Writer::isFileStreamable() const {
return mStreamableFile;
}
bool MPEG4Writer::exceedsFileSizeLimit() {
// No limit
if (mMaxFileSizeLimitBytes == 0) {
return false;
}
int64_t nTotalBytesEstimate = static_cast<int64_t>(mEstimatedMoovBoxSize);
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
nTotalBytesEstimate += (*it)->getEstimatedTrackSizeBytes();
}
// Be conservative in the estimate: do not exceed 95% of
// the target file limit. For small target file size limit, though,
// this will not help.
return (nTotalBytesEstimate >= (95 * mMaxFileSizeLimitBytes) / 100);
}
bool MPEG4Writer::exceedsFileDurationLimit() {
// No limit
if (mMaxFileDurationLimitUs == 0) {
return false;
}
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
if ((*it)->getDurationUs() >= mMaxFileDurationLimitUs) {
return true;
}
}
return false;
}
bool MPEG4Writer::reachedEOS() {
bool allDone = true;
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
if (!(*it)->reachedEOS()) {
allDone = false;
break;
}
}
return allDone;
}
void MPEG4Writer::setStartTimestampUs(int64_t timeUs) {
LOGI("setStartTimestampUs: %lld", timeUs);
CHECK(timeUs >= 0);
Mutex::Autolock autoLock(mLock);
if (mStartTimestampUs < 0 || mStartTimestampUs > timeUs) {
mStartTimestampUs = timeUs;
LOGI("Earliest track starting time: %lld", mStartTimestampUs);
}
}
int64_t MPEG4Writer::getStartTimestampUs() {
Mutex::Autolock autoLock(mLock);
return mStartTimestampUs;
}
size_t MPEG4Writer::numTracks() {
Mutex::Autolock autolock(mLock);
return mTracks.size();
}
////////////////////////////////////////////////////////////////////////////////
MPEG4Writer::Track::Track(
MPEG4Writer *owner, const sp<MediaSource> &source)
: mOwner(owner),
mMeta(source->getFormat()),
mSource(source),
mDone(false),
mPaused(false),
mResumed(false),
mTrackDurationUs(0),
mEstimatedTrackSizeBytes(0),
mSamplesHaveSameSize(true),
mCodecSpecificData(NULL),
mCodecSpecificDataSize(0),
mGotAllCodecSpecificData(false),
mReachedEOS(false),
mRotation(0) {
getCodecSpecificDataFromInputFormatIfPossible();
const char *mime;
mMeta->findCString(kKeyMIMEType, &mime);
mIsAvc = !strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC);
mIsAudio = !strncasecmp(mime, "audio/", 6);
mIsMPEG4 = !strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_MPEG4) ||
!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC);
setTimeScale();
}
void MPEG4Writer::Track::updateTrackSizeEstimate() {
int64_t stcoBoxSizeBytes = mOwner->use32BitFileOffset()
? mNumStcoTableEntries * 4
: mNumStcoTableEntries * 8;
int64_t stszBoxSizeBytes = mSamplesHaveSameSize? 4: (mNumSamples * 4);
mEstimatedTrackSizeBytes = mMdatSizeBytes; // media data size
if (!mOwner->isFileStreamable()) {
// Reserved free space is not large enough to hold
// all meta data and thus wasted.
mEstimatedTrackSizeBytes += mNumStscTableEntries * 12 + // stsc box size
mNumStssTableEntries * 4 + // stss box size
mNumSttsTableEntries * 8 + // stts box size
stcoBoxSizeBytes + // stco box size
stszBoxSizeBytes; // stsz box size
}
}
void MPEG4Writer::Track::addOneStscTableEntry(
size_t chunkId, size_t sampleId) {
StscTableEntry stscEntry(chunkId, sampleId, 1);
mStscTableEntries.push_back(stscEntry);
++mNumStscTableEntries;
}
void MPEG4Writer::Track::addOneStssTableEntry(size_t sampleId) {
mStssTableEntries.push_back(sampleId);
++mNumStssTableEntries;
}
void MPEG4Writer::Track::addOneSttsTableEntry(
size_t sampleCount, int64_t durationUs) {
SttsTableEntry sttsEntry(sampleCount, durationUs);
mSttsTableEntries.push_back(sttsEntry);
++mNumSttsTableEntries;
}
void MPEG4Writer::Track::addChunkOffset(off_t offset) {
++mNumStcoTableEntries;
mChunkOffsets.push_back(offset);
}
void MPEG4Writer::Track::setTimeScale() {
LOGV("setTimeScale");
// Default time scale
mTimeScale = 90000;