C++程序
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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 <arpa/inet.h>
#include <fcntl.h>
#include <inttypes.h>
#include <pthread.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <utils/Log.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/foundation/AMessage.h>
#include <media/stagefright/MPEG4Writer.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MetaData.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 <cutils/properties.h>
#include "include/ESDS.h"
#ifndef __predict_false
#define __predict_false(exp) __builtin_expect((exp) != 0, 0)
#endif
#define WARN_UNLESS(condition, message, ...) \
( (__predict_false(condition)) ? false : ({ \
ALOGW("Condition %s failed " message, #condition, ##__VA_ARGS__); \
true; \
}))
namespace android {
static const int64_t kMinStreamableFileSizeInBytes = 5 * 1024 * 1024;
static const int64_t kMax32BitFileSize = 0x00ffffffffLL; // 2^32-1 : max FAT32
// filesystem file size
// used by most SD cards
static const uint8_t kNalUnitTypeSeqParamSet = 0x07;
static const uint8_t kNalUnitTypePicParamSet = 0x08;
static const int64_t kInitialDelayTimeUs = 700000LL;
static const char kMetaKey_Version[] = "com.android.version";
#ifdef SHOW_MODEL_BUILD
static const char kMetaKey_Model[] = "com.android.model";
static const char kMetaKey_Build[] = "com.android.build";
#endif
static const char kMetaKey_CaptureFps[] = "com.android.capture.fps";
/* uncomment to include model and build in meta */
//#define SHOW_MODEL_BUILD 1
class MPEG4Writer::Track {
public:
Track(MPEG4Writer *owner, const sp<MediaSource> &source, size_t trackId);
~Track();
status_t start(MetaData *params);
status_t stop();
status_t pause();
bool reachedEOS();
int64_t getDurationUs() const;
int64_t getEstimatedTrackSizeBytes() const;
void writeTrackHeader(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(off64_t offset);
int32_t getTrackId() const { return mTrackId; }
status_t dump(int fd, const Vector<String16>& args) const;
static const char *getFourCCForMime(const char *mime);
private:
enum {
kMaxCttsOffsetTimeUs = 1000000LL, // 1 second
kSampleArraySize = 1000,
};
// A helper class to handle faster write box with table entries
template<class TYPE>
struct ListTableEntries {
ListTableEntries(uint32_t elementCapacity, uint32_t entryCapacity)
: mElementCapacity(elementCapacity),
mEntryCapacity(entryCapacity),
mTotalNumTableEntries(0),
mNumValuesInCurrEntry(0),
mCurrTableEntriesElement(NULL) {
CHECK_GT(mElementCapacity, 0);
CHECK_GT(mEntryCapacity, 0);
// Ensure no integer overflow on allocation in add().
CHECK_LT(mEntryCapacity, UINT32_MAX / mElementCapacity);
}
// Free the allocated memory.
~ListTableEntries() {
while (!mTableEntryList.empty()) {
typename List<TYPE *>::iterator it = mTableEntryList.begin();
delete[] (*it);
mTableEntryList.erase(it);
}
}
// Replace the value at the given position by the given value.
// There must be an existing value at the given position.
// @arg value must be in network byte order
// @arg pos location the value must be in.
void set(const TYPE& value, uint32_t pos) {
CHECK_LT(pos, mTotalNumTableEntries * mEntryCapacity);
typename List<TYPE *>::iterator it = mTableEntryList.begin();
uint32_t iterations = (pos / (mElementCapacity * mEntryCapacity));
while (it != mTableEntryList.end() && iterations > 0) {
++it;
--iterations;
}
CHECK(it != mTableEntryList.end());
CHECK_EQ(iterations, 0);
(*it)[(pos % (mElementCapacity * mEntryCapacity))] = value;
}
// Get the value at the given position by the given value.
// @arg value the retrieved value at the position in network byte order.
// @arg pos location the value must be in.
// @return true if a value is found.
bool get(TYPE& value, uint32_t pos) const {
if (pos >= mTotalNumTableEntries * mEntryCapacity) {
return false;
}
typename List<TYPE *>::iterator it = mTableEntryList.begin();
uint32_t iterations = (pos / (mElementCapacity * mEntryCapacity));
while (it != mTableEntryList.end() && iterations > 0) {
++it;
--iterations;
}
CHECK(it != mTableEntryList.end());
CHECK_EQ(iterations, 0);
value = (*it)[(pos % (mElementCapacity * mEntryCapacity))];
return true;
}
// Store a single value.
// @arg value must be in network byte order.
void add(const TYPE& value) {
CHECK_LT(mNumValuesInCurrEntry, mElementCapacity);
uint32_t nEntries = mTotalNumTableEntries % mElementCapacity;
uint32_t nValues = mNumValuesInCurrEntry % mEntryCapacity;
if (nEntries == 0 && nValues == 0) {
mCurrTableEntriesElement = new TYPE[mEntryCapacity * mElementCapacity];
CHECK(mCurrTableEntriesElement != NULL);
mTableEntryList.push_back(mCurrTableEntriesElement);
}
uint32_t pos = nEntries * mEntryCapacity + nValues;
mCurrTableEntriesElement[pos] = value;
++mNumValuesInCurrEntry;
if ((mNumValuesInCurrEntry % mEntryCapacity) == 0) {
++mTotalNumTableEntries;
mNumValuesInCurrEntry = 0;
}
}
// Write out the table entries:
// 1. the number of entries goes first
// 2. followed by the values in the table enties in order
// @arg writer the writer to actual write to the storage
void write(MPEG4Writer *writer) const {
CHECK_EQ(mNumValuesInCurrEntry % mEntryCapacity, 0);
uint32_t nEntries = mTotalNumTableEntries;
writer->writeInt32(nEntries);
for (typename List<TYPE *>::iterator it = mTableEntryList.begin();
it != mTableEntryList.end(); ++it) {
CHECK_GT(nEntries, 0);
if (nEntries >= mElementCapacity) {
writer->write(*it, sizeof(TYPE) * mEntryCapacity, mElementCapacity);
nEntries -= mElementCapacity;
} else {
writer->write(*it, sizeof(TYPE) * mEntryCapacity, nEntries);
break;
}
}
}
// Return the number of entries in the table.
uint32_t count() const { return mTotalNumTableEntries; }
private:
uint32_t mElementCapacity; // # entries in an element
uint32_t mEntryCapacity; // # of values in each entry
uint32_t mTotalNumTableEntries;
uint32_t mNumValuesInCurrEntry; // up to mEntryCapacity
TYPE *mCurrTableEntriesElement;
mutable List<TYPE *> mTableEntryList;
DISALLOW_EVIL_CONSTRUCTORS(ListTableEntries);
};
MPEG4Writer *mOwner;
sp<MetaData> mMeta;
sp<MediaSource> mSource;
volatile bool mDone;
volatile bool mPaused;
volatile bool mResumed;
volatile bool mStarted;
bool mIsAvc;
bool mIsAudio;
bool mIsMPEG4;
int32_t mTrackId;
int64_t mTrackDurationUs;
int64_t mMaxChunkDurationUs;
int64_t mEstimatedTrackSizeBytes;
int64_t mMdatSizeBytes;
int32_t mTimeScale;
pthread_t mThread;
List<MediaBuffer *> mChunkSamples;
bool mSamplesHaveSameSize;
ListTableEntries<uint32_t> *mStszTableEntries;
ListTableEntries<uint32_t> *mStcoTableEntries;
ListTableEntries<off64_t> *mCo64TableEntries;
ListTableEntries<uint32_t> *mStscTableEntries;
ListTableEntries<uint32_t> *mStssTableEntries;
ListTableEntries<uint32_t> *mSttsTableEntries;
ListTableEntries<uint32_t> *mCttsTableEntries;
int64_t mMinCttsOffsetTimeUs;
int64_t mMaxCttsOffsetTimeUs;
// 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 mStartTimeRealUs;
int64_t mFirstSampleTimeRealUs;
int64_t mPreviousTrackTimeUs;
int64_t mTrackEveryTimeDurationUs;
// Update the audio track's drift information.
void updateDriftTime(const sp<MetaData>& meta);
int32_t getStartTimeOffsetScaledTime() const;
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);
// Duration is time scale based
void addOneSttsTableEntry(size_t sampleCount, int32_t timescaledDur);
void addOneCttsTableEntry(size_t sampleCount, int32_t timescaledDur);
bool isTrackMalFormed() const;
void sendTrackSummary(bool hasMultipleTracks);
// Write the boxes
void writeStcoBox(bool use32BitOffset);
void writeStscBox();
void writeStszBox();
void writeStssBox();
void writeSttsBox();
void writeCttsBox();
void writeD263Box();
void writePaspBox();
void writeAvccBox();
void writeUrlBox();
void writeDrefBox();
void writeDinfBox();
void writeDamrBox();
void writeMdhdBox(uint32_t now);
void writeSmhdBox();
void writeVmhdBox();
void writeHdlrBox();
void writeTkhdBox(uint32_t now);
void writeMp4aEsdsBox();
void writeMp4vEsdsBox();
void writeAudioFourCCBox();
void writeVideoFourCCBox();
void writeStblBox(bool use32BitOffset);
Track(const Track &);
Track &operator=(const Track &);
};
MPEG4Writer::MPEG4Writer(int fd)
: mFd(dup(fd)),
mInitCheck(mFd < 0? NO_INIT: OK),
mIsRealTimeRecording(true),
mUse4ByteNalLength(true),
mUse32BitOffset(true),
mIsFileSizeLimitExplicitlyRequested(false),
mPaused(false),
mStarted(false),
mWriterThreadStarted(false),
mOffset(0),
mMdatOffset(0),
mMoovBoxBuffer(NULL),
mMoovBoxBufferOffset(0),
mWriteMoovBoxToMemory(false),
mFreeBoxOffset(0),
mStreamableFile(false),
mEstimatedMoovBoxSize(0),
mMoovExtraSize(0),
mInterleaveDurationUs(1000000),
mTimeScale(-1),
mStartTimestampUs(-1ll),
mLatitudex10000(0),
mLongitudex10000(0),
mAreGeoTagsAvailable(false),
mStartTimeOffsetMs(-1),
mMetaKeys(new AMessage()) {
addDeviceMeta();
// Verify mFd is seekable
off64_t off = lseek64(mFd, 0, SEEK_SET);
if (off < 0) {
ALOGE("cannot seek mFd: %s (%d)", strerror(errno), errno);
release();
}
}
MPEG4Writer::~MPEG4Writer() {
reset();
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);
snprintf(buffer, SIZE, " frames encoded : %d\n", mStszTableEntries->count());
result.append(buffer);
snprintf(buffer, SIZE, " duration encoded : %" PRId64 " us\n", mTrackDurationUs);
result.append(buffer);
::write(fd, result.string(), result.size());
return OK;
}
// static
const char *MPEG4Writer::Track::getFourCCForMime(const char *mime) {
if (mime == NULL) {
return NULL;
}
if (!strncasecmp(mime, "audio/", 6)) {
if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_AMR_NB, mime)) {
return "samr";
} else if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_AMR_WB, mime)) {
return "sawb";
} else if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_AAC, mime)) {
return "mp4a";
}
} else if (!strncasecmp(mime, "video/", 6)) {
if (!strcasecmp(MEDIA_MIMETYPE_VIDEO_MPEG4, mime)) {
return "mp4v";
} else if (!strcasecmp(MEDIA_MIMETYPE_VIDEO_H263, mime)) {
return "s263";
} else if (!strcasecmp(MEDIA_MIMETYPE_VIDEO_AVC, mime)) {
return "avc1";
}
} else {
ALOGE("Track (%s) other than video or audio is not supported", mime);
}
return NULL;
}
status_t MPEG4Writer::addSource(const sp<MediaSource> &source) {
Mutex::Autolock l(mLock);
if (mStarted) {
ALOGE("Attempt to add source AFTER recording is started");
return UNKNOWN_ERROR;
}
// At most 2 tracks can be supported.
if (mTracks.size() >= 2) {
ALOGE("Too many tracks (%zu) to add", mTracks.size());
return ERROR_UNSUPPORTED;
}
CHECK(source.get() != NULL);
const char *mime;
source->getFormat()->findCString(kKeyMIMEType, &mime);
bool isAudio = !strncasecmp(mime, "audio/", 6);
if (Track::getFourCCForMime(mime) == NULL) {
ALOGE("Unsupported mime '%s'", mime);
return ERROR_UNSUPPORTED;
}
// At this point, we know the track to be added is either
// video or audio. Thus, we only need to check whether it
// is an audio track or not (if it is not, then it must be
// a video track).
// No more than one video or one audio track is supported.
for (List<Track*>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
if ((*it)->isAudio() == isAudio) {
ALOGE("%s track already exists", isAudio? "Audio": "Video");
return ERROR_UNSUPPORTED;
}
}
// This is the first track of either audio or video.
// Go ahead to add the track.
Track *track = new Track(this, source, 1 + mTracks.size());
mTracks.push_back(track);
return OK;
}
status_t MPEG4Writer::startTracks(MetaData *params) {
if (mTracks.empty()) {
ALOGE("No source added");
return INVALID_OPERATION;
}
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;
}
void MPEG4Writer::addDeviceMeta() {
// add device info and estimate space in 'moov'
char val[PROPERTY_VALUE_MAX];
size_t n;
// meta size is estimated by adding up the following:
// - meta header structures, which occur only once (total 66 bytes)
// - size for each key, which consists of a fixed header (32 bytes),
// plus key length and data length.
mMoovExtraSize += 66;
if (property_get("ro.build.version.release", val, NULL)
&& (n = strlen(val)) > 0) {
mMetaKeys->setString(kMetaKey_Version, val, n + 1);
mMoovExtraSize += sizeof(kMetaKey_Version) + n + 32;
}
#ifdef SHOW_MODEL_BUILD
if (property_get("ro.product.model", val, NULL)
&& (n = strlen(val)) > 0) {
mMetaKeys->setString(kMetaKey_Model, val, n + 1);
mMoovExtraSize += sizeof(kMetaKey_Model) + n + 32;
}
if (property_get("ro.build.display.id", val, NULL)
&& (n = strlen(val)) > 0) {
mMetaKeys->setString(kMetaKey_Build, val, n + 1);
mMoovExtraSize += sizeof(kMetaKey_Build) + n + 32;
}
#endif
}
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;
}
// Account for the extra stuff (Geo, meta keys, etc.)
size += mMoovExtraSize;
ALOGI("limits: %" PRId64 "/%" PRId64 " bytes/us, bit rate: %d bps and the"
" estimated moov size %" PRId64 " bytes",
mMaxFileSizeLimitBytes, mMaxFileDurationLimitUs, bitRate, size);
return factor * size;
}
status_t MPEG4Writer::start(MetaData *param) {
if (mInitCheck != OK) {
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) {
ALOGW("32-bit file size limit (%" PRId64 " bytes) too big. "
"It is changed to %" PRId64 " bytes",
mMaxFileSizeLimitBytes, kMax32BitFileSize);
mMaxFileSizeLimitBytes = kMax32BitFileSize;
}
}
int32_t use2ByteNalLength;
if (param &&
param->findInt32(kKey2ByteNalLength, &use2ByteNalLength) &&
use2ByteNalLength) {
mUse4ByteNalLength = false;
}
int32_t isRealTimeRecording;
if (param && param->findInt32(kKeyRealTimeRecording, &isRealTimeRecording)) {
mIsRealTimeRecording = isRealTimeRecording;
}
mStartTimestampUs = -1;
if (mStarted) {
if (mPaused) {
mPaused = false;
return startTracks(param);
}
return OK;
}
if (!param ||
!param->findInt32(kKeyTimeScale, &mTimeScale)) {
mTimeScale = 1000;
}
CHECK_GT(mTimeScale, 0);
ALOGV("movie time scale: %d", mTimeScale);
/*
* When the requested file size limit is small, the priority
* is to meet the file size limit requirement, rather than
* to make the file streamable. mStreamableFile does not tell
* whether the actual recorded file is streamable or not.
*/
mStreamableFile =
(mMaxFileSizeLimitBytes != 0 &&
mMaxFileSizeLimitBytes >= kMinStreamableFileSizeInBytes);
/*
* mWriteMoovBoxToMemory is true if the amount of data in moov box is
* smaller than the reserved free space at the beginning of a file, AND
* when the content of moov box is constructed. Note that video/audio
* frame data is always written to the file but not in the memory.
*
* Before stop()/reset() is called, mWriteMoovBoxToMemory is always
* false. When reset() is called at the end of a recording session,
* Moov box needs to be constructed.
*
* 1) Right before a moov box is constructed, mWriteMoovBoxToMemory
* to set to mStreamableFile so that if
* the file is intended to be streamable, it is set to true;
* otherwise, it is set to false. When the value is set to false,
* all the content of the moov box is written immediately to
* the end of the file. When the value is set to true, all the
* content of the moov box is written to an in-memory cache,
* mMoovBoxBuffer, util the following condition happens. Note
* that the size of the in-memory cache is the same as the
* reserved free space at the beginning of the file.
*
* 2) While the data of the moov box is written to an in-memory
* cache, the data size is checked against the reserved space.
* If the data size surpasses the reserved space, subsequent moov
* data could no longer be hold in the in-memory cache. This also
* indicates that the reserved space was too small. At this point,
* _all_ moov data must be written to the end of the file.
* mWriteMoovBoxToMemory must be set to false to direct the write
* to the file.
*
* 3) If the data size in moov box is smaller than the reserved
* space after moov box is completely constructed, the in-memory
* cache copy of the moov box is written to the reserved free
* space. Thus, immediately after the moov is completedly
* constructed, mWriteMoovBoxToMemory is always set to false.
*/
mWriteMoovBoxToMemory = false;
mMoovBoxBuffer = NULL;
mMoovBoxBufferOffset = 0;
writeFtypBox(param);
mFreeBoxOffset = mOffset;
if (mEstimatedMoovBoxSize == 0) {
int32_t bitRate = -1;
if (param) {
param->findInt32(kKeyBitRate, &bitRate);
}
mEstimatedMoovBoxSize = estimateMoovBoxSize(bitRate);
}
CHECK_GE(mEstimatedMoovBoxSize, 8);
if (mStreamableFile) {
// Reserve a 'free' box only for streamable file
lseek64(mFd, mFreeBoxOffset, SEEK_SET);
writeInt32(mEstimatedMoovBoxSize);
write("free", 4);
mMdatOffset = mFreeBoxOffset + mEstimatedMoovBoxSize;
} else {
mMdatOffset = mOffset;
}
mOffset = mMdatOffset;
lseek64(mFd, 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 (mInitCheck != OK) {
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() {
ALOGD("Stopping writer thread");
if (!mWriterThreadStarted) {
return;
}
{
Mutex::Autolock autolock(mLock);
mDone = true;
mChunkReadyCondition.signal();
}
void *dummy;
pthread_join(mThread, &dummy);
mWriterThreadStarted = false;
ALOGD("Writer thread stopped");
}
/*
* 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) {
ALOGV("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
}
void MPEG4Writer::release() {
close(mFd);
mFd = -1;
mInitCheck = NO_INIT;
mStarted = false;
free(mMoovBoxBuffer);
mMoovBoxBuffer = NULL;
}
status_t MPEG4Writer::reset() {
if (mInitCheck != OK) {
return OK;
} else {
if (!mWriterThreadStarted ||
!mStarted) {
if (mWriterThreadStarted) {
stopWriterThread();
}
release();
return OK;
}
}
status_t err = OK;
int64_t maxDurationUs = 0;
int64_t minDurationUs = 0x7fffffffffffffffLL;
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;
}
if (durationUs < minDurationUs) {
minDurationUs = durationUs;
}
}
if (mTracks.size() > 1) {
ALOGD("Duration from tracks range is [%" PRId64 ", %" PRId64 "] us",
minDurationUs, maxDurationUs);
}
stopWriterThread();
// Do not write out movie header on error.
if (err != OK) {
release();
return err;
}
// Fix up the size of the 'mdat' chunk.
if (mUse32BitOffset) {
lseek64(mFd, mMdatOffset, SEEK_SET);
uint32_t size = htonl(static_cast<uint32_t>(mOffset - mMdatOffset));
::write(mFd, &size, 4);
} else {
lseek64(mFd, mMdatOffset + 8, SEEK_SET);
uint64_t size = mOffset - mMdatOffset;
size = hton64(size);
::write(mFd, &size, 8);
}
lseek64(mFd, mOffset, SEEK_SET);
// Construct moov box now
mMoovBoxBufferOffset = 0;
mWriteMoovBoxToMemory = mStreamableFile;
if (mWriteMoovBoxToMemory) {
// There is no need to allocate in-memory cache
// for moov box if the file is not streamable.
mMoovBoxBuffer = (uint8_t *) malloc(mEstimatedMoovBoxSize);
CHECK(mMoovBoxBuffer != NULL);
}
writeMoovBox(maxDurationUs);
// mWriteMoovBoxToMemory could be set to false in
// MPEG4Writer::write() method
if (mWriteMoovBoxToMemory) {
mWriteMoovBoxToMemory = false;
// Content of the moov box is saved in the cache, and the in-memory
// moov box needs to be written to the file in a single shot.
CHECK_LE(mMoovBoxBufferOffset + 8, mEstimatedMoovBoxSize);
// Moov box
lseek64(mFd, mFreeBoxOffset, SEEK_SET);
mOffset = mFreeBoxOffset;
write(mMoovBoxBuffer, 1, mMoovBoxBufferOffset);
// Free box
lseek64(mFd, mOffset, SEEK_SET);
writeInt32(mEstimatedMoovBoxSize - mMoovBoxBufferOffset);
write("free", 4);
} else {
ALOGI("The mp4 file will not be streamable.");
}
// Free in-memory cache for moov box
if (mMoovBoxBuffer != NULL) {
free(mMoovBoxBuffer);
mMoovBoxBuffer = NULL;
mMoovBoxBufferOffset = 0;
}
CHECK(mBoxes.empty());
release();
return err;
}
uint32_t MPEG4Writer::getMpeg4Time() {
time_t now = time(NULL);
// MP4 file uses time counting seconds since midnight, Jan. 1, 1904
// while time function returns Unix epoch values which starts
// at 1970-01-01. Lets add the number of seconds between them
uint32_t mpeg4Time = now + (66 * 365 + 17) * (24 * 60 * 60);
return mpeg4Time;
}
void MPEG4Writer::writeMvhdBox(int64_t durationUs) {
uint32_t now = getMpeg4Time();
beginBox("mvhd");
writeInt32(0); // version=0, flags=0
writeInt32(now); // creation time
writeInt32(now); // modification time
writeInt32(mTimeScale); // mvhd timescale
int32_t duration = (durationUs * mTimeScale + 5E5) / 1E6;
writeInt32(duration);
writeInt32(0x10000); // rate: 1.0
writeInt16(0x100); // volume
writeInt16(0); // reserved
writeInt32(0); // reserved
writeInt32(0); // reserved
writeCompositionMatrix(0); // matrix
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
}
void MPEG4Writer::writeMoovBox(int64_t durationUs) {
beginBox("moov");
writeMvhdBox(durationUs);
if (mAreGeoTagsAvailable) {
writeUdtaBox();
}
writeMetaBox();
int32_t id = 1;
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it, ++id) {
(*it)->writeTrackHeader(mUse32BitOffset);
}
endBox(); // moov
}
void MPEG4Writer::writeFtypBox(MetaData *param) {
beginBox("ftyp");
int32_t fileType;
if (param && param->findInt32(kKeyFileType, &fileType) &&
fileType != OUTPUT_FORMAT_MPEG_4) {
writeFourcc("3gp4");
writeInt32(0);
writeFourcc("isom");
writeFourcc("3gp4");
} else {
writeFourcc("mp42");
writeInt32(0);
writeFourcc("isom");
writeFourcc("mp42");
}
endBox();
}
static bool isTestModeEnabled() {
#if (PROPERTY_VALUE_MAX < 5)
#error "PROPERTY_VALUE_MAX must be at least 5"
#endif
// Test mode is enabled only if rw.media.record.test system
// property is enabled.
char value[PROPERTY_VALUE_MAX];
if (property_get("rw.media.record.test", value, NULL) &&
(!strcasecmp(value, "true") || !strcasecmp(value, "1"))) {
return true;
}
return false;
}
void MPEG4Writer::sendSessionSummary() {
// Send session summary only if test mode is enabled
if (!isTestModeEnabled()) {
return;
}
for (List<ChunkInfo>::iterator it = mChunkInfos.begin();
it != mChunkInfos.end(); ++it) {
int trackNum = it->mTrack->getTrackId() << 28;
notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INTER_CHUNK_TIME_MS,
it->mMaxInterChunkDurUs);
}
}
status_t MPEG4Writer::setInterleaveDuration(uint32_t durationUs) {
mInterleaveDurationUs = durationUs;
return OK;
}
void MPEG4Writer::lock() {
mLock.lock();
}
void MPEG4Writer::unlock() {
mLock.unlock();
}
off64_t MPEG4Writer::addSample_l(MediaBuffer *buffer) {
off64_t old_offset = mOffset;
::write(mFd,
(const uint8_t *)buffer->data() + buffer->range_offset(),
buffer->range_length());
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);
}
}
off64_t MPEG4Writer::addLengthPrefixedSample_l(MediaBuffer *buffer) {
off64_t old_offset = mOffset;
size_t length = buffer->range_length();
if (mUse4ByteNalLength) {
uint8_t x = length >> 24;
::write(mFd, &x, 1);
x = (length >> 16) & 0xff;
::write(mFd, &x, 1);
x = (length >> 8) & 0xff;
::write(mFd, &x, 1);
x = length & 0xff;
::write(mFd, &x, 1);
::write(mFd,
(const uint8_t *)buffer->data() + buffer->range_offset(),
length);
mOffset += length + 4;
} else {
CHECK_LT(length, 65536);
uint8_t x = length >> 8;
::write(mFd, &x, 1);
x = length & 0xff;
::write(mFd, &x, 1);
::write(mFd, (const uint8_t *)buffer->data() + buffer->range_offset(), length);
mOffset += length + 2;
}
return old_offset;
}
size_t MPEG4Writer::write(
const void *ptr, size_t size, size_t nmemb) {
const size_t bytes = size * nmemb;
if (mWriteMoovBoxToMemory) {
off64_t moovBoxSize = 8 + mMoovBoxBufferOffset + bytes;
if (moovBoxSize > mEstimatedMoovBoxSize) {
// The reserved moov box at the beginning of the file
// is not big enough. Moov box should be written to
// the end of the file from now on, but not to the
// in-memory cache.
// We write partial moov box that is in the memory to
// the file first.
for (List<off64_t>::iterator it = mBoxes.begin();
it != mBoxes.end(); ++it) {
(*it) += mOffset;
}
lseek64(mFd, mOffset, SEEK_SET);
::write(mFd, mMoovBoxBuffer, mMoovBoxBufferOffset);
::write(mFd, ptr, bytes);
mOffset += (bytes + mMoovBoxBufferOffset);
// All subsequent moov box content will be written
// to the end of the file.
mWriteMoovBoxToMemory = false;
} else {
memcpy(mMoovBoxBuffer + mMoovBoxBufferOffset, ptr, bytes);
mMoovBoxBufferOffset += bytes;
}
} else {
::write(mFd, ptr, size * nmemb);
mOffset += bytes;
}
return bytes;
}
void MPEG4Writer::beginBox(uint32_t id) {
mBoxes.push_back(mWriteMoovBoxToMemory?
mMoovBoxBufferOffset: mOffset);
writeInt32(0);
writeInt32(id);
}
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());
off64_t offset = *--mBoxes.end();
mBoxes.erase(--mBoxes.end());
if (mWriteMoovBoxToMemory) {
int32_t x = htonl(mMoovBoxBufferOffset - offset);
memcpy(mMoovBoxBuffer + offset, &x, 4);
} else {
lseek64(mFd, offset, SEEK_SET);
writeInt32(mOffset - offset);
mOffset -= 4;
lseek64(mFd, mOffset, SEEK_SET);
}
}
void MPEG4Writer::writeInt8(int8_t x) {
write(&x, 1, 1);
}
void MPEG4Writer::writeInt16(int16_t x) {
x = htons(x);
write(&x, 1, 2);
}
void MPEG4Writer::writeInt32(int32_t x) {
x = htonl(x);
write(&x, 1, 4);
}
void MPEG4Writer::writeInt64(int64_t x) {
x = hton64(x);
write(&x, 1, 8);
}
void MPEG4Writer::writeCString(const char *s) {
size_t n = strlen(s);
write(s, 1, n + 1);
}
void MPEG4Writer::writeFourcc(const char *s) {
CHECK_EQ(strlen(s), 4);
write(s, 1, 4);
}
// Written in +/-DD.DDDD format
void MPEG4Writer::writeLatitude(int degreex10000) {
bool isNegative = (degreex10000 < 0);
char sign = isNegative? '-': '+';
// Handle the whole part
char str[9];
int wholePart = degreex10000 / 10000;
if (wholePart == 0) {
snprintf(str, 5, "%c%.2d.", sign, wholePart);
} else {
snprintf(str, 5, "%+.2d.", wholePart);
}
// Handle the fractional part
int fractionalPart = degreex10000 - (wholePart * 10000);
if (fractionalPart < 0) {
fractionalPart = -fractionalPart;
}
snprintf(&str[4], 5, "%.4d", fractionalPart);
// Do not write the null terminator
write(str, 1, 8);
}
// Written in +/- DDD.DDDD format
void MPEG4Writer::writeLongitude(int degreex10000) {
bool isNegative = (degreex10000 < 0);
char sign = isNegative? '-': '+';
// Handle the whole part
char str[10];
int wholePart = degreex10000 / 10000;
if (wholePart == 0) {
snprintf(str, 6, "%c%.3d.", sign, wholePart);
} else {
snprintf(str, 6, "%+.3d.", wholePart);
}
// Handle the fractional part
int fractionalPart = degreex10000 - (wholePart * 10000);
if (fractionalPart < 0) {
fractionalPart = -fractionalPart;
}
snprintf(&str[5], 5, "%.4d", fractionalPart);
// Do not write the null terminator
write(str, 1, 9);
}
/*
* Geodata is stored according to ISO-6709 standard.
* latitudex10000 is latitude in degrees times 10000, and
* longitudex10000 is longitude in degrees times 10000.
* The range for the latitude is in [-90, +90], and
* The range for the longitude is in [-180, +180]
*/
status_t MPEG4Writer::setGeoData(int latitudex10000, int longitudex10000) {
// Is latitude or longitude out of range?
if (latitudex10000 < -900000 || latitudex10000 > 900000 ||
longitudex10000 < -1800000 || longitudex10000 > 1800000) {
return BAD_VALUE;
}
mLatitudex10000 = latitudex10000;
mLongitudex10000 = longitudex10000;
mAreGeoTagsAvailable = true;
mMoovExtraSize += 30;
return OK;
}
status_t MPEG4Writer::setCaptureRate(float captureFps) {
if (captureFps <= 0.0f) {
return BAD_VALUE;
}
mMetaKeys->setFloat(kMetaKey_CaptureFps, captureFps);
mMoovExtraSize += sizeof(kMetaKey_CaptureFps) + 4 + 32;
return OK;
}
void MPEG4Writer::write(const void *data, size_t size) {
write(data, 1, size);
}
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();
}
if (!mStreamableFile) {
// Add 1024 bytes as error tolerance
return nTotalBytesEstimate + 1024 >= mMaxFileSizeLimitBytes;
}
// 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) {
ALOGI("setStartTimestampUs: %" PRId64, timeUs);
CHECK_GE(timeUs, 0ll);
Mutex::Autolock autoLock(mLock);
if (mStartTimestampUs < 0 || mStartTimestampUs > timeUs) {
mStartTimestampUs = timeUs;
ALOGI("Earliest track starting time: %" PRId64, 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, size_t trackId)
: mOwner(owner),
mMeta(source->getFormat()),
mSource(source),
mDone(false),
mPaused(false),
mResumed(false),
mStarted(false),
mTrackId(trackId),
mTrackDurationUs(0),
mEstimatedTrackSizeBytes(0),
mSamplesHaveSameSize(true),
mStszTableEntries(new ListTableEntries<uint32_t>(1000, 1)),
mStcoTableEntries(new ListTableEntries<uint32_t>(1000, 1)),
mCo64TableEntries(new ListTableEntries<off64_t>(1000, 1)),
mStscTableEntries(new ListTableEntries<uint32_t>(1000, 3)),
mStssTableEntries(new ListTableEntries<uint32_t>(1000, 1)),
mSttsTableEntries(new ListTableEntries<uint32_t>(1000, 2)),
mCttsTableEntries(new ListTableEntries<uint32_t>(1000, 2)),
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() {
uint32_t stcoBoxCount = (mOwner->use32BitFileOffset()
? mStcoTableEntries->count()
: mCo64TableEntries->count());
int64_t stcoBoxSizeBytes = stcoBoxCount * 4;
int64_t stszBoxSizeBytes = mSamplesHaveSameSize? 4: (mStszTableEntries->count() * 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 += mStscTableEntries->count() * 12 + // stsc box size
mStssTableEntries->count() * 4 + // stss box size
mSttsTableEntries->count() * 8 + // stts box size
mCttsTableEntries->count() * 8 + // ctts box size
stcoBoxSizeBytes + // stco box size
stszBoxSizeBytes; // stsz box size
}
}
void MPEG4Writer::Track::addOneStscTableEntry(
size_t chunkId, size_t sampleId) {
mStscTableEntries->add(htonl(chunkId));
mStscTableEntries->add(htonl(sampleId));
mStscTableEntries->add(htonl(1));
}
void MPEG4Writer::Track::addOneStssTableEntry(size_t sampleId) {
mStssTableEntries->add(htonl(sampleId));
}
void MPEG4Writer::Track::addOneSttsTableEntry(
size_t sampleCount, int32_t duration) {
if (duration == 0) {
ALOGW("0-duration samples found: %zu", sampleCount);
}
mSttsTableEntries->add(htonl(sampleCount));
mSttsTableEntries->add(htonl(duration));
}
void MPEG4Writer::Track::addOneCttsTableEntry(
size_t sampleCount, int32_t duration) {
if (mIsAudio) {
return;
}
mCttsTableEntries->add(htonl(sampleCount));
mCttsTableEntries->add(htonl(duration));
}
void MPEG4Writer::Track::addChunkOffset(off64_t offset) {
if (mOwner->use32BitFileOffset()) {
uint32_t value = offset;
mStcoTableEntries->add(htonl(value));
} else {
mCo64TableEntries->add(hton64(offset));
}
}
void MPEG4Writer::Track::setTimeScale() {
ALOGV("setTimeScale");
// Default time scale
mTimeScale = 90000;
if (mIsAudio) {
// Use the sampling rate as the default time scale for audio track.
int32_t sampleRate;
bool success = mMeta->findInt32(kKeySampleRate, &sampleRate);
CHECK(success);
mTimeScale = sampleRate;
}
// If someone would like to overwrite the timescale, use user-supplied value.
int32_t timeScale;
if (mMeta->findInt32(kKeyTimeScale, &timeScale)) {
mTimeScale = timeScale;
}
CHECK_GT(mTimeScale, 0);
}
void MPEG4Writer::Track::getCodecSpecificDataFromInputFormatIfPossible() {
const char *mime;
CHECK(mMeta->findCString(kKeyMIMEType, &mime));
if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) {
uint32_t type;
const void *data;
size_t size;
if (mMeta->findData(kKeyAVCC, &type, &data, &size)) {
mCodecSpecificData = malloc(size);
mCodecSpecificDataSize = size;
memcpy(mCodecSpecificData, data, size);
mGotAllCodecSpecificData = true;
}
} else if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_MPEG4)
|| !strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC)) {
uint32_t type;
const void *data;
size_t size;
if (mMeta->findData(kKeyESDS, &type, &data, &size)) {
ESDS esds(data, size);
if (esds.getCodecSpecificInfo(&data, &size) == OK) {
mCodecSpecificData = malloc(size);
mCodecSpecificDataSize = size;
memcpy(mCodecSpecificData, data, size);
mGotAllCodecSpecificData = true;
}
}
}
}
MPEG4Writer::Track::~Track() {
stop();
delete mStszTableEntries;
delete mStcoTableEntries;
delete mCo64TableEntries;
delete mStscTableEntries;
delete mSttsTableEntries;
delete mStssTableEntries;
delete mCttsTableEntries;
mStszTableEntries = NULL;
mStcoTableEntries = NULL;
mCo64TableEntries = NULL;
mStscTableEntries = NULL;
mSttsTableEntries = NULL;
mStssTableEntries = NULL;
mCttsTableEntries = NULL;
if (mCodecSpecificData != NULL) {
free(mCodecSpecificData);
mCodecSpecificData = NULL;
}
}
void MPEG4Writer::Track::initTrackingProgressStatus(MetaData *params) {
ALOGV("initTrackingProgressStatus");
mPreviousTrackTimeUs = -1;
mTrackingProgressStatus = false;
mTrackEveryTimeDurationUs = 0;
{
int64_t timeUs;
if (params && params->findInt64(kKeyTrackTimeStatus, &timeUs)) {
ALOGV("Receive request to track progress status for every %" PRId64 " us", timeUs);
mTrackEveryTimeDurationUs = timeUs;
mTrackingProgressStatus = true;
}
}
}
// static
void *MPEG4Writer::ThreadWrapper(void *me) {
ALOGV("ThreadWrapper: %p", me);
MPEG4Writer *writer = static_cast<MPEG4Writer *>(me);
writer->threadFunc();
return NULL;
}
void MPEG4Writer::bufferChunk(const Chunk& chunk) {
ALOGV("bufferChunk: %p", chunk.mTrack);
Mutex::Autolock autolock(mLock);
CHECK_EQ(mDone, false);
for (List<ChunkInfo>::iterator it = mChunkInfos.begin();
it != mChunkInfos.end(); ++it) {
if (chunk.mTrack == it->mTrack) { // Found owner
it->mChunks.push_back(chunk);
mChunkReadyCondition.signal();
return;
}
}
CHECK(!"Received a chunk for a unknown track");
}
void MPEG4Writer::writeChunkToFile(Chunk* chunk) {
ALOGV("writeChunkToFile: %" PRId64 " from %s track",
chunk->mTimeStampUs, chunk->mTrack->isAudio()? "audio": "video");
int32_t isFirstSample = true;
while (!chunk->mSamples.empty()) {
List<MediaBuffer *>::iterator it = chunk->mSamples.begin();
off64_t offset = chunk->mTrack->isAvc()
? addLengthPrefixedSample_l(*it)
: addSample_l(*it);
if (isFirstSample) {
chunk->mTrack->addChunkOffset(offset);
isFirstSample = false;
}
(*it)->release();
(*it) = NULL;
chunk->mSamples.erase(it);
}
chunk->mSamples.clear();
}
void MPEG4Writer::writeAllChunks() {
ALOGV("writeAllChunks");
size_t outstandingChunks = 0;
Chunk chunk;
while (findChunkToWrite(&chunk)) {
writeChunkToFile(&chunk);
++outstandingChunks;
}
sendSessionSummary();
mChunkInfos.clear();
ALOGD("%zu chunks are written in the last batch", outstandingChunks);
}
bool MPEG4Writer::findChunkToWrite(Chunk *chunk) {
ALOGV("findChunkToWrite");
int64_t minTimestampUs = 0x7FFFFFFFFFFFFFFFLL;
Track *track = NULL;
for (List<ChunkInfo>::iterator it = mChunkInfos.begin();
it != mChunkInfos.end(); ++it) {
if (!it->mChunks.empty()) {
List<Chunk>::iterator chunkIt = it->mChunks.begin();
if (chunkIt->mTimeStampUs < minTimestampUs) {
minTimestampUs = chunkIt->mTimeStampUs;
track = it->mTrack;
}
}
}
if (track == NULL) {
ALOGV("Nothing to be written after all");
return false;
}
if (mIsFirstChunk) {
mIsFirstChunk = false;
}
for (List<ChunkInfo>::iterator it = mChunkInfos.begin();
it != mChunkInfos.end(); ++it) {
if (it->mTrack == track) {
*chunk = *(it->mChunks.begin());
it->mChunks.erase(it->mChunks.begin());
CHECK_EQ(chunk->mTrack, track);
int64_t interChunkTimeUs =
chunk->mTimeStampUs - it->mPrevChunkTimestampUs;
if (interChunkTimeUs > it->mPrevChunkTimestampUs) {
it->mMaxInterChunkDurUs = interChunkTimeUs;
}
return true;
}
}
return false;
}
void MPEG4Writer::threadFunc() {
ALOGV("threadFunc");
prctl(PR_SET_NAME, (unsigned long)"MPEG4Writer", 0, 0, 0);
Mutex::Autolock autoLock(mLock);
while (!mDone) {
Chunk chunk;
bool chunkFound = false;
while (!mDone && !(chunkFound = findChunkToWrite(&chunk))) {
mChunkReadyCondition.wait(mLock);
}
// In real time recording mode, write without holding the lock in order
// to reduce the blocking time for media track threads.
// Otherwise, hold the lock until the existing chunks get written to the
// file.
if (chunkFound) {
if (mIsRealTimeRecording) {
mLock.unlock();
}
writeChunkToFile(&chunk);
if (mIsRealTimeRecording) {
mLock.lock();
}
}
}
writeAllChunks();
}
status_t MPEG4Writer::startWriterThread() {
ALOGV("startWriterThread");
mDone = false;
mIsFirstChunk = true;
mDriftTimeUs = 0;
for (List<Track *>::iterator it = mTracks.begin();
it != mTracks.end(); ++it) {
ChunkInfo info;
info.mTrack = *it;
info.mPrevChunkTimestampUs = 0;
info.mMaxInterChunkDurUs = 0;
mChunkInfos.push_back(info);
}
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
pthread_create(&mThread, &attr, ThreadWrapper, this);
pthread_attr_destroy(&attr);
mWriterThreadStarted = true;
return OK;
}
status_t MPEG4Writer::Track::start(MetaData *params) {
if (!mDone && mPaused) {
mPaused = false;
mResumed = true;
return OK;
}
int64_t startTimeUs;
if (params == NULL || !params->findInt64(kKeyTime, &startTimeUs)) {
startTimeUs = 0;
}
mStartTimeRealUs = startTimeUs;
int32_t rotationDegrees;
if (!mIsAudio && params && params->findInt32(kKeyRotation, &rotationDegrees)) {
mRotation = rotationDegrees;
}
initTrackingProgressStatus(params);
sp<MetaData> meta = new MetaData;
if (mOwner->isRealTimeRecording() && mOwner->numTracks() > 1) {
/*
* This extra delay of accepting incoming audio/video signals
* helps to align a/v start time at the beginning of a recording
* session, and it also helps eliminate the "recording" sound for
* camcorder applications.
*
* If client does not set the start time offset, we fall back to
* use the default initial delay value.
*/
int64_t startTimeOffsetUs = mOwner->getStartTimeOffsetMs() * 1000LL;
if (startTimeOffsetUs < 0) { // Start time offset was not set
startTimeOffsetUs = kInitialDelayTimeUs;
}
startTimeUs += startTimeOffsetUs;
ALOGI("Start time offset: %" PRId64 " us", startTimeOffsetUs);
}
meta->setInt64(kKeyTime, startTimeUs);
status_t err = mSource->start(meta.get());
if (err != OK) {
mDone = mReachedEOS = true;
return err;
}
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
mDone = false;
mStarted = true;
mTrackDurationUs = 0;
mReachedEOS = false;
mEstimatedTrackSizeBytes = 0;
mMdatSizeBytes = 0;
mMaxChunkDurationUs = 0;
pthread_create(&mThread, &attr, ThreadWrapper, this);
pthread_attr_destroy(&attr);
return OK;
}
status_t MPEG4Writer::Track::pause() {
mPaused = true;
return OK;
}
status_t MPEG4Writer::Track::stop() {
ALOGD("%s track stopping", mIsAudio? "Audio": "Video");
if (!mStarted) {
ALOGE("Stop() called but track is not started");
return ERROR_END_OF_STREAM;
}
if (mDone) {
return OK;
}
mDone = true;
ALOGD("%s track source stopping", mIsAudio? "Audio": "Video");
mSource->stop();
ALOGD("%s track source stopped", mIsAudio? "Audio": "Video");
void *dummy;
pthread_join(mThread, &dummy);
status_t err = static_cast<status_t>(reinterpret_cast<uintptr_t>(dummy));
ALOGD("%s track stopped", mIsAudio? "Audio": "Video");
return err;
}
bool MPEG4Writer::Track::reachedEOS() {
return mReachedEOS;
}
// static
void *MPEG4Writer::Track::ThreadWrapper(void *me) {
Track *track = static_cast<Track *>(me);
status_t err = track->threadEntry();
return (void *)(uintptr_t)err;
}
static void getNalUnitType(uint8_t byte, uint8_t* type) {
ALOGV("getNalUnitType: %d", byte);
// nal_unit_type: 5-bit unsigned integer
*type = (byte & 0x1F);
}
static const uint8_t *findNextStartCode(
const uint8_t *data, size_t length) {
ALOGV("findNextStartCode: %p %zu", data, length);
size_t bytesLeft = length;
while (bytesLeft > 4 &&
memcmp("\x00\x00\x00\x01", &data[length - bytesLeft], 4)) {
--bytesLeft;
}
if (bytesLeft <= 4) {
bytesLeft = 0; // Last parameter set
}
return &data[length - bytesLeft];
}
const uint8_t *MPEG4Writer::Track::parseParamSet(
const uint8_t *data, size_t length, int type, size_t *paramSetLen) {
ALOGV("parseParamSet");
CHECK(type == kNalUnitTypeSeqParamSet ||
type == kNalUnitTypePicParamSet);
const uint8_t *nextStartCode = findNextStartCode(data, length);
*paramSetLen = nextStartCode - data;
if (*paramSetLen == 0) {
ALOGE("Param set is malformed, since its length is 0");
return NULL;
}
AVCParamSet paramSet(*paramSetLen, data);
if (type == kNalUnitTypeSeqParamSet) {
if (*paramSetLen < 4) {
ALOGE("Seq parameter set malformed");
return NULL;
}
if (mSeqParamSets.empty()) {
mProfileIdc = data[1];
mProfileCompatible = data[2];
mLevelIdc = data[3];
} else {
if (mProfileIdc != data[1] ||
mProfileCompatible != data[2] ||
mLevelIdc != data[3]) {
ALOGE("Inconsistent profile/level found in seq parameter sets");
return NULL;
}
}
mSeqParamSets.push_back(paramSet);
} else {
mPicParamSets.push_back(paramSet);
}
return nextStartCode;
}
status_t MPEG4Writer::Track::copyAVCCodecSpecificData(
const uint8_t *data, size_t size) {
ALOGV("copyAVCCodecSpecificData");
// 2 bytes for each of the parameter set length field
// plus the 7 bytes for the header
if (size < 4 + 7) {
ALOGE("Codec specific data length too short: %zu", size);
return ERROR_MALFORMED;
}
mCodecSpecificDataSize = size;
mCodecSpecificData = malloc(size);
memcpy(mCodecSpecificData, data, size);
return OK;
}
status_t MPEG4Writer::Track::parseAVCCodecSpecificData(
const uint8_t *data, size_t size) {
ALOGV("parseAVCCodecSpecificData");
// Data starts with a start code.
// SPS and PPS are separated with start codes.
// Also, SPS must come before PPS
uint8_t type = kNalUnitTypeSeqParamSet;
bool gotSps = false;
bool gotPps = false;
const uint8_t *tmp = data;
const uint8_t *nextStartCode = data;
size_t bytesLeft = size;
size_t paramSetLen = 0;
mCodecSpecificDataSize = 0;
while (bytesLeft > 4 && !memcmp("\x00\x00\x00\x01", tmp, 4)) {
getNalUnitType(*(tmp + 4), &type);
if (type == kNalUnitTypeSeqParamSet) {
if (gotPps) {
ALOGE("SPS must come before PPS");
return ERROR_MALFORMED;
}
if (!gotSps) {
gotSps = true;
}
nextStartCode = parseParamSet(tmp + 4, bytesLeft - 4, type, ¶mSetLen);
} else if (type == kNalUnitTypePicParamSet) {
if (!gotSps) {
ALOGE("SPS must come before PPS");
return ERROR_MALFORMED;
}
if (!gotPps) {
gotPps = true;
}
nextStartCode = parseParamSet(tmp + 4, bytesLeft - 4, type, ¶mSetLen);
} else {
ALOGE("Only SPS and PPS Nal units are expected");
return ERROR_MALFORMED;
}
if (nextStartCode == NULL) {
return ERROR_MALFORMED;
}
// Move on to find the next parameter set
bytesLeft -= nextStartCode - tmp;
tmp = nextStartCode;
mCodecSpecificDataSize += (2 + paramSetLen);
}
{
// Check on the number of seq parameter sets
size_t nSeqParamSets = mSeqParamSets.size();
if (nSeqParamSets == 0) {
ALOGE("Cound not find sequence parameter set");
return ERROR_MALFORMED;
}
if (nSeqParamSets > 0x1F) {
ALOGE("Too many seq parameter sets (%zu) found", nSeqParamSets);
return ERROR_MALFORMED;
}
}
{
// Check on the number of pic parameter sets
size_t nPicParamSets = mPicParamSets.size();
if (nPicParamSets == 0) {
ALOGE("Cound not find picture parameter set");
return ERROR_MALFORMED;
}
if (nPicParamSets > 0xFF) {
ALOGE("Too many pic parameter sets (%zd) found", nPicParamSets);
return ERROR_MALFORMED;
}
}
// FIXME:
// Add chromat_format_idc, bit depth values, etc for AVC/h264 high profile and above
// and remove #if 0
#if 0
{
// Check on the profiles
// These profiles requires additional parameter set extensions
if (mProfileIdc == 100 || mProfileIdc == 110 ||
mProfileIdc == 122 || mProfileIdc == 144) {
ALOGE("Sorry, no support for profile_idc: %d!", mProfileIdc);
return BAD_VALUE;
}
}
#endif
return OK;
}
status_t MPEG4Writer::Track::makeAVCCodecSpecificData(
const uint8_t *data, size_t size) {
if (mCodecSpecificData != NULL) {
ALOGE("Already have codec specific data");
return ERROR_MALFORMED;
}
if (size < 4) {
ALOGE("Codec specific data length too short: %zu", size);
return ERROR_MALFORMED;
}
// Data is in the form of AVCCodecSpecificData
if (memcmp("\x00\x00\x00\x01", data, 4)) {
return copyAVCCodecSpecificData(data, size);
}
if (parseAVCCodecSpecificData(data, size) != OK) {
return ERROR_MALFORMED;
}
// ISO 14496-15: AVC file format
mCodecSpecificDataSize += 7; // 7 more bytes in the header
mCodecSpecificData = malloc(mCodecSpecificDataSize);
uint8_t *header = (uint8_t *)mCodecSpecificData;
header[0] = 1; // version
header[1] = mProfileIdc; // profile indication
header[2] = mProfileCompatible; // profile compatibility
header[3] = mLevelIdc;
// 6-bit '111111' followed by 2-bit to lengthSizeMinuusOne
if (mOwner->useNalLengthFour()) {
header[4] = 0xfc | 3; // length size == 4 bytes
} else {
header[4] = 0xfc | 1; // length size == 2 bytes
}
// 3-bit '111' followed by 5-bit numSequenceParameterSets
int nSequenceParamSets = mSeqParamSets.size();
header[5] = 0xe0 | nSequenceParamSets;
header += 6;
for (List<AVCParamSet>::iterator it = mSeqParamSets.begin();
it != mSeqParamSets.end(); ++it) {
// 16-bit sequence parameter set length
uint16_t seqParamSetLength = it->mLength;
header[0] = seqParamSetLength >> 8;
header[1] = seqParamSetLength & 0xff;
// SPS NAL unit (sequence parameter length bytes)
memcpy(&header[2], it->mData, seqParamSetLength);
header += (2 + seqParamSetLength);
}
// 8-bit nPictureParameterSets
int nPictureParamSets = mPicParamSets.size();
header[0] = nPictureParamSets;
header += 1;
for (List<AVCParamSet>::iterator it = mPicParamSets.begin();
it != mPicParamSets.end(); ++it) {
// 16-bit picture parameter set length
uint16_t picParamSetLength = it->mLength;
header[0] = picParamSetLength >> 8;
header[1] = picParamSetLength & 0xff;
// PPS Nal unit (picture parameter set length bytes)
memcpy(&header[2], it->mData, picParamSetLength);
header += (2 + picParamSetLength);
}
return OK;
}
/*
* Updates the drift time from the audio track so that
* the video track can get the updated drift time information
* from the file writer. The fluctuation of the drift time of the audio
* encoding path is smoothed out with a simple filter by giving a larger
* weight to more recently drift time. The filter coefficients, 0.5 and 0.5,
* are heuristically determined.
*/
void MPEG4Writer::Track::updateDriftTime(const sp<MetaData>& meta) {
int64_t driftTimeUs = 0;
if (meta->findInt64(kKeyDriftTime, &driftTimeUs)) {
int64_t prevDriftTimeUs = mOwner->getDriftTimeUs();
int64_t timeUs = (driftTimeUs + prevDriftTimeUs) >> 1;
mOwner->setDriftTimeUs(timeUs);
}
}
status_t MPEG4Writer::Track::threadEntry() {
int32_t count = 0;
const int64_t interleaveDurationUs = mOwner->interleaveDuration();
const bool hasMultipleTracks = (mOwner->numTracks() > 1);
int64_t chunkTimestampUs = 0;
int32_t nChunks = 0;
int32_t nZeroLengthFrames = 0;
int64_t lastTimestampUs = 0; // Previous sample time stamp
int64_t lastDurationUs = 0; // Between the previous two samples
int64_t currDurationTicks = 0; // Timescale based ticks
int64_t lastDurationTicks = 0; // Timescale based ticks
int32_t sampleCount = 1; // Sample count in the current stts table entry
uint32_t previousSampleSize = 0; // Size of the previous sample
int64_t previousPausedDurationUs = 0;
int64_t timestampUs = 0;
int64_t cttsOffsetTimeUs = 0;
int64_t currCttsOffsetTimeTicks = 0; // Timescale based ticks
int64_t lastCttsOffsetTimeTicks = -1; // Timescale based ticks
int32_t cttsSampleCount = 0; // Sample count in the current ctts table entry
uint32_t lastSamplesPerChunk = 0;
if (mIsAudio) {
prctl(PR_SET_NAME, (unsigned long)"AudioTrackEncoding", 0, 0, 0);
} else {
prctl(PR_SET_NAME, (unsigned long)"VideoTrackEncoding", 0, 0, 0);
}
if (mOwner->isRealTimeRecording()) {
androidSetThreadPriority(0, ANDROID_PRIORITY_AUDIO);
}
sp<MetaData> meta_data;
status_t err = OK;
MediaBuffer *buffer;
const char *trackName = mIsAudio ? "Audio" : "Video";
while (!mDone && (err = mSource->read(&buffer)) == OK) {
if (buffer->range_length() == 0) {
buffer->release();
buffer = NULL;
++nZeroLengthFrames;
continue;
}
// If the codec specific data has not been received yet, delay pause.
// After the codec specific data is received, discard what we received
// when the track is to be paused.
if (mPaused && !mResumed) {
buffer->release();
buffer = NULL;
continue;
}
++count;
int32_t isCodecConfig;
if (buffer->meta_data()->findInt32(kKeyIsCodecConfig, &isCodecConfig)
&& isCodecConfig) {
CHECK(!mGotAllCodecSpecificData);
if (mIsAvc) {
status_t err = makeAVCCodecSpecificData(
(const uint8_t *)buffer->data()
+ buffer->range_offset(),
buffer->range_length());
CHECK_EQ((status_t)OK, err);
} else if (mIsMPEG4) {
mCodecSpecificDataSize = buffer->range_length();
mCodecSpecificData = malloc(mCodecSpecificDataSize);
memcpy(mCodecSpecificData,
(const uint8_t *)buffer->data()
+ buffer->range_offset(),
buffer->range_length());
}
buffer->release();
buffer = NULL;
mGotAllCodecSpecificData = true;
continue;
}
// Make a deep copy of the MediaBuffer and Metadata and release
// the original as soon as we can
MediaBuffer *copy = new MediaBuffer(buffer->range_length());
memcpy(copy->data(), (uint8_t *)buffer->data() + buffer->range_offset(),
buffer->range_length());
copy->set_range(0, buffer->range_length());
meta_data = new MetaData(*buffer->meta_data().get());
buffer->release();
buffer = NULL;
if (mIsAvc) StripStartcode(copy);
size_t sampleSize = copy->range_length();
if (mIsAvc) {
if (mOwner->useNalLengthFour()) {
sampleSize += 4;
} else {
sampleSize += 2;
}
}
// Max file size or duration handling
mMdatSizeBytes += sampleSize;
updateTrackSizeEstimate();
if (mOwner->exceedsFileSizeLimit()) {
mOwner->notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED, 0);
break;
}
if (mOwner->exceedsFileDurationLimit()) {
mOwner->notify(MEDIA_RECORDER_EVENT_INFO, MEDIA_RECORDER_INFO_MAX_DURATION_REACHED, 0);
break;
}
int32_t isSync = false;
meta_data->findInt32(kKeyIsSyncFrame, &isSync);
CHECK(meta_data->findInt64(kKeyTime, ×tampUs));
////////////////////////////////////////////////////////////////////////////////
if (mStszTableEntries->count() == 0) {
mFirstSampleTimeRealUs = systemTime() / 1000;
mStartTimestampUs = timestampUs;
mOwner->setStartTimestampUs(mStartTimestampUs);
previousPausedDurationUs = mStartTimestampUs;
}
if (mResumed) {
int64_t durExcludingEarlierPausesUs = timestampUs - previousPausedDurationUs;
if (WARN_UNLESS(durExcludingEarlierPausesUs >= 0ll, "for %s track", trackName)) {
copy->release();
return ERROR_MALFORMED;
}
int64_t pausedDurationUs = durExcludingEarlierPausesUs - mTrackDurationUs;
if (WARN_UNLESS(pausedDurationUs >= lastDurationUs, "for %s track", trackName)) {
copy->release();
return ERROR_MALFORMED;
}
previousPausedDurationUs += pausedDurationUs - lastDurationUs;
mResumed = false;
}
timestampUs -= previousPausedDurationUs;
if (WARN_UNLESS(timestampUs >= 0ll, "for %s track", trackName)) {
copy->release();
return ERROR_MALFORMED;
}
if (!mIsAudio) {
/*
* Composition time: timestampUs
* Decoding time: decodingTimeUs
* Composition time offset = composition time - decoding time
*/
int64_t decodingTimeUs;
CHECK(meta_data->findInt64(kKeyDecodingTime, &decodingTimeUs));
decodingTimeUs -= previousPausedDurationUs;
cttsOffsetTimeUs =
timestampUs + kMaxCttsOffsetTimeUs - decodingTimeUs;
if (WARN_UNLESS(cttsOffsetTimeUs >= 0ll, "for %s track", trackName)) {
copy->release();
return ERROR_MALFORMED;
}
timestampUs = decodingTimeUs;
ALOGV("decoding time: %" PRId64 " and ctts offset time: %" PRId64,
timestampUs, cttsOffsetTimeUs);
// Update ctts box table if necessary
currCttsOffsetTimeTicks =
(cttsOffsetTimeUs * mTimeScale + 500000LL) / 1000000LL;
if (WARN_UNLESS(currCttsOffsetTimeTicks <= 0x0FFFFFFFFLL, "for %s track", trackName)) {
copy->release();
return ERROR_MALFORMED;
}
if (mStszTableEntries->count() == 0) {
// Force the first ctts table entry to have one single entry
// so that we can do adjustment for the initial track start
// time offset easily in writeCttsBox().
lastCttsOffsetTimeTicks = currCttsOffsetTimeTicks;
addOneCttsTableEntry(1, currCttsOffsetTimeTicks);
cttsSampleCount = 0; // No sample in ctts box is pending
} else {
if (currCttsOffsetTimeTicks != lastCttsOffsetTimeTicks) {
addOneCttsTableEntry(cttsSampleCount, lastCttsOffsetTimeTicks);
lastCttsOffsetTimeTicks = currCttsOffsetTimeTicks;
cttsSampleCount = 1; // One sample in ctts box is pending
} else {
++cttsSampleCount;
}
}
// Update ctts time offset range
if (mStszTableEntries->count() == 0) {
mMinCttsOffsetTimeUs = currCttsOffsetTimeTicks;
mMaxCttsOffsetTimeUs = currCttsOffsetTimeTicks;
} else {
if (currCttsOffsetTimeTicks > mMaxCttsOffsetTimeUs) {
mMaxCttsOffsetTimeUs = currCttsOffsetTimeTicks;
} else if (currCttsOffsetTimeTicks < mMinCttsOffsetTimeUs) {
mMinCttsOffsetTimeUs = currCttsOffsetTimeTicks;
}
}
}
if (mOwner->isRealTimeRecording()) {
if (mIsAudio) {
updateDriftTime(meta_data);
}
}
if (WARN_UNLESS(timestampUs >= 0ll, "for %s track", trackName)) {
copy->release();
return ERROR_MALFORMED;
}
ALOGV("%s media time stamp: %" PRId64 " and previous paused duration %" PRId64,
trackName, timestampUs, previousPausedDurationUs);
if (timestampUs > mTrackDurationUs) {
mTrackDurationUs = timestampUs;
}
// We need to use the time scale based ticks, rather than the
// timestamp itself to determine whether we have to use a new
// stts entry, since we may have rounding errors.
// The calculation is intended to reduce the accumulated
// rounding errors.
currDurationTicks =
((timestampUs * mTimeScale + 500000LL) / 1000000LL -
(lastTimestampUs * mTimeScale + 500000LL) / 1000000LL);
if (currDurationTicks < 0ll) {
ALOGE("timestampUs %" PRId64 " < lastTimestampUs %" PRId64 " for %s track",
timestampUs, lastTimestampUs, trackName);
copy->release();
return UNKNOWN_ERROR;
}
// if the duration is different for this sample, see if it is close enough to the previous
// duration that we can fudge it and use the same value, to avoid filling the stts table
// with lots of near-identical entries.
// "close enough" here means that the current duration needs to be adjusted by less
// than 0.1 milliseconds
if (lastDurationTicks && (currDurationTicks != lastDurationTicks)) {
int64_t deltaUs = ((lastDurationTicks - currDurationTicks) * 1000000LL
+ (mTimeScale / 2)) / mTimeScale;
if (deltaUs > -100 && deltaUs < 100) {
// use previous ticks, and adjust timestamp as if it was actually that number
// of ticks
currDurationTicks = lastDurationTicks;
timestampUs += deltaUs;
}
}
mStszTableEntries->add(htonl(sampleSize));
if (mStszTableEntries->count() > 2) {
// Force the first sample to have its own stts entry so that
// we can adjust its value later to maintain the A/V sync.
if (mStszTableEntries->count() == 3 || currDurationTicks != lastDurationTicks) {
addOneSttsTableEntry(sampleCount, lastDurationTicks);
sampleCount = 1;
} else {
++sampleCount;
}
}
if (mSamplesHaveSameSize) {
if (mStszTableEntries->count() >= 2 && previousSampleSize != sampleSize) {
mSamplesHaveSameSize = false;
}
previousSampleSize = sampleSize;
}
ALOGV("%s timestampUs/lastTimestampUs: %" PRId64 "/%" PRId64,
trackName, timestampUs, lastTimestampUs);
lastDurationUs = timestampUs - lastTimestampUs;
lastDurationTicks = currDurationTicks;
lastTimestampUs = timestampUs;
if (isSync != 0) {
addOneStssTableEntry(mStszTableEntries->count());
}
if (mTrackingProgressStatus) {
if (mPreviousTrackTimeUs <= 0) {
mPreviousTrackTimeUs = mStartTimestampUs;
}
trackProgressStatus(timestampUs);
}
if (!hasMultipleTracks) {
off64_t offset = mIsAvc? mOwner->addLengthPrefixedSample_l(copy)
: mOwner->addSample_l(copy);
uint32_t count = (mOwner->use32BitFileOffset()
? mStcoTableEntries->count()
: mCo64TableEntries->count());
if (count == 0) {
addChunkOffset(offset);
}
copy->release();
copy = NULL;
continue;
}
mChunkSamples.push_back(copy);
if (interleaveDurationUs == 0) {
addOneStscTableEntry(++nChunks, 1);
bufferChunk(timestampUs);
} else {
if (chunkTimestampUs == 0) {
chunkTimestampUs = timestampUs;
} else {
int64_t chunkDurationUs = timestampUs - chunkTimestampUs;
if (chunkDurationUs > interleaveDurationUs) {
if (chunkDurationUs > mMaxChunkDurationUs) {
mMaxChunkDurationUs = chunkDurationUs;
}
++nChunks;
if (nChunks == 1 || // First chunk
lastSamplesPerChunk != mChunkSamples.size()) {
lastSamplesPerChunk = mChunkSamples.size();
addOneStscTableEntry(nChunks, lastSamplesPerChunk);
}
bufferChunk(timestampUs);
chunkTimestampUs = timestampUs;
}
}
}
}
if (isTrackMalFormed()) {
err = ERROR_MALFORMED;
}
mOwner->trackProgressStatus(mTrackId, -1, err);
// Last chunk
if (!hasMultipleTracks) {
addOneStscTableEntry(1, mStszTableEntries->count());
} else if (!mChunkSamples.empty()) {
addOneStscTableEntry(++nChunks, mChunkSamples.size());
bufferChunk(timestampUs);
}
// We don't really know how long the last frame lasts, since
// there is no frame time after it, just repeat the previous
// frame's duration.
if (mStszTableEntries->count() == 1) {
lastDurationUs = 0; // A single sample's duration
lastDurationTicks = 0;
} else {
++sampleCount; // Count for the last sample
}
if (mStszTableEntries->count() <= 2) {
addOneSttsTableEntry(1, lastDurationTicks);
if (sampleCount - 1 > 0) {
addOneSttsTableEntry(sampleCount - 1, lastDurationTicks);
}
} else {
addOneSttsTableEntry(sampleCount, lastDurationTicks);
}
// The last ctts box may not have been written yet, and this
// is to make sure that we write out the last ctts box.
if (currCttsOffsetTimeTicks == lastCttsOffsetTimeTicks) {
if (cttsSampleCount > 0) {
addOneCttsTableEntry(cttsSampleCount, lastCttsOffsetTimeTicks);
}
}
mTrackDurationUs += lastDurationUs;
mReachedEOS = true;
sendTrackSummary(hasMultipleTracks);
ALOGI("Received total/0-length (%d/%d) buffers and encoded %d frames. - %s",
count, nZeroLengthFrames, mStszTableEntries->count(), trackName);
if (mIsAudio) {
ALOGI("Audio track drift time: %" PRId64 " us", mOwner->getDriftTimeUs());
}
if (err == ERROR_END_OF_STREAM) {
return OK;
}
return err;
}
bool MPEG4Writer::Track::isTrackMalFormed() const {
if (mStszTableEntries->count() == 0) { // no samples written
ALOGE("The number of recorded samples is 0");
return true;
}
if (!mIsAudio && mStssTableEntries->count() == 0) { // no sync frames for video
ALOGE("There are no sync frames for video track");
return true;
}
if (OK != checkCodecSpecificData()) { // no codec specific data
return true;
}
return false;
}
void MPEG4Writer::Track::sendTrackSummary(bool hasMultipleTracks) {
// Send track summary only if test mode is enabled.
if (!isTestModeEnabled()) {
return;
}
int trackNum = (mTrackId << 28);
mOwner->notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_TYPE,
mIsAudio? 0: 1);
mOwner->notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_DURATION_MS,
mTrackDurationUs / 1000);
mOwner->notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_ENCODED_FRAMES,
mStszTableEntries->count());
{
// The system delay time excluding the requested initial delay that
// is used to eliminate the recording sound.
int64_t startTimeOffsetUs = mOwner->getStartTimeOffsetMs() * 1000LL;
if (startTimeOffsetUs < 0) { // Start time offset was not set
startTimeOffsetUs = kInitialDelayTimeUs;
}
int64_t initialDelayUs =
mFirstSampleTimeRealUs - mStartTimeRealUs - startTimeOffsetUs;
mOwner->notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_INITIAL_DELAY_MS,
(initialDelayUs) / 1000);
}
mOwner->notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_DATA_KBYTES,
mMdatSizeBytes / 1024);
if (hasMultipleTracks) {
mOwner->notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_MAX_CHUNK_DUR_MS,
mMaxChunkDurationUs / 1000);
int64_t moovStartTimeUs = mOwner->getStartTimestampUs();
if (mStartTimestampUs != moovStartTimeUs) {
int64_t startTimeOffsetUs = mStartTimestampUs - moovStartTimeUs;
mOwner->notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_START_OFFSET_MS,
startTimeOffsetUs / 1000);
}
}
}
void MPEG4Writer::Track::trackProgressStatus(int64_t timeUs, status_t err) {
ALOGV("trackProgressStatus: %" PRId64 " us", timeUs);
if (mTrackEveryTimeDurationUs > 0 &&
timeUs - mPreviousTrackTimeUs >= mTrackEveryTimeDurationUs) {
ALOGV("Fire time tracking progress status at %" PRId64 " us", timeUs);
mOwner->trackProgressStatus(mTrackId, timeUs - mPreviousTrackTimeUs, err);
mPreviousTrackTimeUs = timeUs;
}
}
void MPEG4Writer::trackProgressStatus(
size_t trackId, int64_t timeUs, status_t err) {
Mutex::Autolock lock(mLock);
int32_t trackNum = (trackId << 28);
// Error notification
// Do not consider ERROR_END_OF_STREAM an error
if (err != OK && err != ERROR_END_OF_STREAM) {
notify(MEDIA_RECORDER_TRACK_EVENT_ERROR,
trackNum | MEDIA_RECORDER_TRACK_ERROR_GENERAL,
err);
return;
}
if (timeUs == -1) {
// Send completion notification
notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_COMPLETION_STATUS,
err);
} else {
// Send progress status
notify(MEDIA_RECORDER_TRACK_EVENT_INFO,
trackNum | MEDIA_RECORDER_TRACK_INFO_PROGRESS_IN_TIME,
timeUs / 1000);
}
}
void MPEG4Writer::setDriftTimeUs(int64_t driftTimeUs) {
ALOGV("setDriftTimeUs: %" PRId64 " us", driftTimeUs);
Mutex::Autolock autolock(mLock);
mDriftTimeUs = driftTimeUs;
}
int64_t MPEG4Writer::getDriftTimeUs() {
ALOGV("getDriftTimeUs: %" PRId64 " us", mDriftTimeUs);
Mutex::Autolock autolock(mLock);
return mDriftTimeUs;
}
bool MPEG4Writer::isRealTimeRecording() const {
return mIsRealTimeRecording;
}
bool MPEG4Writer::useNalLengthFour() {
return mUse4ByteNalLength;
}
void MPEG4Writer::Track::bufferChunk(int64_t timestampUs) {
ALOGV("bufferChunk");
Chunk chunk(this, timestampUs, mChunkSamples);
mOwner->bufferChunk(chunk);
mChunkSamples.clear();
}
int64_t MPEG4Writer::Track::getDurationUs() const {
return mTrackDurationUs;
}
int64_t MPEG4Writer::Track::getEstimatedTrackSizeBytes() const {
return mEstimatedTrackSizeBytes;
}
status_t MPEG4Writer::Track::checkCodecSpecificData() const {
const char *mime;
CHECK(mMeta->findCString(kKeyMIMEType, &mime));
if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_AAC, mime) ||
!strcasecmp(MEDIA_MIMETYPE_VIDEO_MPEG4, mime) ||
!strcasecmp(MEDIA_MIMETYPE_VIDEO_AVC, mime)) {
if (!mCodecSpecificData ||
mCodecSpecificDataSize <= 0) {
ALOGE("Missing codec specific data");
return ERROR_MALFORMED;
}
} else {
if (mCodecSpecificData ||
mCodecSpecificDataSize > 0) {
ALOGE("Unexepected codec specific data found");
return ERROR_MALFORMED;
}
}
return OK;
}
void MPEG4Writer::Track::writeTrackHeader(bool use32BitOffset) {
ALOGV("%s track time scale: %d",
mIsAudio? "Audio": "Video", mTimeScale);
uint32_t now = getMpeg4Time();
mOwner->beginBox("trak");
writeTkhdBox(now);
mOwner->beginBox("mdia");
writeMdhdBox(now);
writeHdlrBox();
mOwner->beginBox("minf");
if (mIsAudio) {
writeSmhdBox();
} else {
writeVmhdBox();
}
writeDinfBox();
writeStblBox(use32BitOffset);
mOwner->endBox(); // minf
mOwner->endBox(); // mdia
mOwner->endBox(); // trak
}
void MPEG4Writer::Track::writeStblBox(bool use32BitOffset) {
mOwner->beginBox("stbl");
mOwner->beginBox("stsd");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(1); // entry count
if (mIsAudio) {
writeAudioFourCCBox();
} else {
writeVideoFourCCBox();
}
mOwner->endBox(); // stsd
writeSttsBox();
writeCttsBox();
if (!mIsAudio) {
writeStssBox();
}
writeStszBox();
writeStscBox();
writeStcoBox(use32BitOffset);
mOwner->endBox(); // stbl
}
void MPEG4Writer::Track::writeVideoFourCCBox() {
const char *mime;
bool success = mMeta->findCString(kKeyMIMEType, &mime);
CHECK(success);
const char *fourcc = getFourCCForMime(mime);
if (fourcc == NULL) {
ALOGE("Unknown mime type '%s'.", mime);
CHECK(!"should not be here, unknown mime type.");
}
mOwner->beginBox(fourcc); // video format
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(0); // reserved
mOwner->writeInt16(1); // data ref index
mOwner->writeInt16(0); // predefined
mOwner->writeInt16(0); // reserved
mOwner->writeInt32(0); // predefined
mOwner->writeInt32(0); // predefined
mOwner->writeInt32(0); // predefined
int32_t width, height;
success = mMeta->findInt32(kKeyWidth, &width);
success = success && mMeta->findInt32(kKeyHeight, &height);
CHECK(success);
mOwner->writeInt16(width);
mOwner->writeInt16(height);
mOwner->writeInt32(0x480000); // horiz resolution
mOwner->writeInt32(0x480000); // vert resolution
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(1); // frame count
mOwner->writeInt8(0); // compressor string length
mOwner->write(" ", 31);
mOwner->writeInt16(0x18); // depth
mOwner->writeInt16(-1); // predefined
CHECK_LT(23 + mCodecSpecificDataSize, 128);
if (!strcasecmp(MEDIA_MIMETYPE_VIDEO_MPEG4, mime)) {
writeMp4vEsdsBox();
} else if (!strcasecmp(MEDIA_MIMETYPE_VIDEO_H263, mime)) {
writeD263Box();
} else if (!strcasecmp(MEDIA_MIMETYPE_VIDEO_AVC, mime)) {
writeAvccBox();
}
writePaspBox();
mOwner->endBox(); // mp4v, s263 or avc1
}
void MPEG4Writer::Track::writeAudioFourCCBox() {
const char *mime;
bool success = mMeta->findCString(kKeyMIMEType, &mime);
CHECK(success);
const char *fourcc = getFourCCForMime(mime);
if (fourcc == NULL) {
ALOGE("Unknown mime type '%s'.", mime);
CHECK(!"should not be here, unknown mime type.");
}
mOwner->beginBox(fourcc); // audio format
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(0); // reserved
mOwner->writeInt16(0x1); // data ref index
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(0); // reserved
int32_t nChannels;
CHECK_EQ(true, mMeta->findInt32(kKeyChannelCount, &nChannels));
mOwner->writeInt16(nChannels); // channel count
mOwner->writeInt16(16); // sample size
mOwner->writeInt16(0); // predefined
mOwner->writeInt16(0); // reserved
int32_t samplerate;
success = mMeta->findInt32(kKeySampleRate, &samplerate);
CHECK(success);
mOwner->writeInt32(samplerate << 16);
if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_AAC, mime)) {
writeMp4aEsdsBox();
} else if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_AMR_NB, mime) ||
!strcasecmp(MEDIA_MIMETYPE_AUDIO_AMR_WB, mime)) {
writeDamrBox();
}
mOwner->endBox();
}
void MPEG4Writer::Track::writeMp4aEsdsBox() {
mOwner->beginBox("esds");
CHECK(mCodecSpecificData);
CHECK_GT(mCodecSpecificDataSize, 0);
// Make sure all sizes encode to a single byte.
CHECK_LT(mCodecSpecificDataSize + 23, 128);
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt8(0x03); // ES_DescrTag
mOwner->writeInt8(23 + mCodecSpecificDataSize);
mOwner->writeInt16(0x0000);// ES_ID
mOwner->writeInt8(0x00);
mOwner->writeInt8(0x04); // DecoderConfigDescrTag
mOwner->writeInt8(15 + mCodecSpecificDataSize);
mOwner->writeInt8(0x40); // objectTypeIndication ISO/IEC 14492-2
mOwner->writeInt8(0x15); // streamType AudioStream
mOwner->writeInt16(0x03); // XXX
mOwner->writeInt8(0x00); // buffer size 24-bit
int32_t bitRate;
bool success = mMeta->findInt32(kKeyBitRate, &bitRate);
mOwner->writeInt32(success ? bitRate : 96000); // max bit rate
mOwner->writeInt32(success ? bitRate : 96000); // avg bit rate
mOwner->writeInt8(0x05); // DecoderSpecificInfoTag
mOwner->writeInt8(mCodecSpecificDataSize);
mOwner->write(mCodecSpecificData, mCodecSpecificDataSize);
static const uint8_t kData2[] = {
0x06, // SLConfigDescriptorTag
0x01,
0x02
};
mOwner->write(kData2, sizeof(kData2));
mOwner->endBox(); // esds
}
void MPEG4Writer::Track::writeMp4vEsdsBox() {
CHECK(mCodecSpecificData);
CHECK_GT(mCodecSpecificDataSize, 0);
mOwner->beginBox("esds");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt8(0x03); // ES_DescrTag
mOwner->writeInt8(23 + mCodecSpecificDataSize);
mOwner->writeInt16(0x0000); // ES_ID
mOwner->writeInt8(0x1f);
mOwner->writeInt8(0x04); // DecoderConfigDescrTag
mOwner->writeInt8(15 + mCodecSpecificDataSize);
mOwner->writeInt8(0x20); // objectTypeIndication ISO/IEC 14492-2
mOwner->writeInt8(0x11); // streamType VisualStream
static const uint8_t kData[] = {
0x01, 0x77, 0x00,
0x00, 0x03, 0xe8, 0x00,
0x00, 0x03, 0xe8, 0x00
};
mOwner->write(kData, sizeof(kData));
mOwner->writeInt8(0x05); // DecoderSpecificInfoTag
mOwner->writeInt8(mCodecSpecificDataSize);
mOwner->write(mCodecSpecificData, mCodecSpecificDataSize);
static const uint8_t kData2[] = {
0x06, // SLConfigDescriptorTag
0x01,
0x02
};
mOwner->write(kData2, sizeof(kData2));
mOwner->endBox(); // esds
}
void MPEG4Writer::Track::writeTkhdBox(uint32_t now) {
mOwner->beginBox("tkhd");
// Flags = 7 to indicate that the track is enabled, and
// part of the presentation
mOwner->writeInt32(0x07); // version=0, flags=7
mOwner->writeInt32(now); // creation time
mOwner->writeInt32(now); // modification time
mOwner->writeInt32(mTrackId); // track id starts with 1
mOwner->writeInt32(0); // reserved
int64_t trakDurationUs = getDurationUs();
int32_t mvhdTimeScale = mOwner->getTimeScale();
int32_t tkhdDuration =
(trakDurationUs * mvhdTimeScale + 5E5) / 1E6;
mOwner->writeInt32(tkhdDuration); // in mvhd timescale
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(0); // reserved
mOwner->writeInt16(0); // layer
mOwner->writeInt16(0); // alternate group
mOwner->writeInt16(mIsAudio ? 0x100 : 0); // volume
mOwner->writeInt16(0); // reserved
mOwner->writeCompositionMatrix(mRotation); // matrix
if (mIsAudio) {
mOwner->writeInt32(0);
mOwner->writeInt32(0);
} else {
int32_t width, height;
bool success = mMeta->findInt32(kKeyWidth, &width);
success = success && mMeta->findInt32(kKeyHeight, &height);
CHECK(success);
mOwner->writeInt32(width << 16); // 32-bit fixed-point value
mOwner->writeInt32(height << 16); // 32-bit fixed-point value
}
mOwner->endBox(); // tkhd
}
void MPEG4Writer::Track::writeVmhdBox() {
mOwner->beginBox("vmhd");
mOwner->writeInt32(0x01); // version=0, flags=1
mOwner->writeInt16(0); // graphics mode
mOwner->writeInt16(0); // opcolor
mOwner->writeInt16(0);
mOwner->writeInt16(0);
mOwner->endBox();
}
void MPEG4Writer::Track::writeSmhdBox() {
mOwner->beginBox("smhd");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt16(0); // balance
mOwner->writeInt16(0); // reserved
mOwner->endBox();
}
void MPEG4Writer::Track::writeHdlrBox() {
mOwner->beginBox("hdlr");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(0); // component type: should be mhlr
mOwner->writeFourcc(mIsAudio ? "soun" : "vide"); // component subtype
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(0); // reserved
mOwner->writeInt32(0); // reserved
// Removing "r" for the name string just makes the string 4 byte aligned
mOwner->writeCString(mIsAudio ? "SoundHandle": "VideoHandle"); // name
mOwner->endBox();
}
void MPEG4Writer::Track::writeMdhdBox(uint32_t now) {
int64_t trakDurationUs = getDurationUs();
mOwner->beginBox("mdhd");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(now); // creation time
mOwner->writeInt32(now); // modification time
mOwner->writeInt32(mTimeScale); // media timescale
int32_t mdhdDuration = (trakDurationUs * mTimeScale + 5E5) / 1E6;
mOwner->writeInt32(mdhdDuration); // use media timescale
// Language follows the three letter standard ISO-639-2/T
// 'e', 'n', 'g' for "English", for instance.
// Each character is packed as the difference between its ASCII value and 0x60.
// For "English", these are 00101, 01110, 00111.
// XXX: Where is the padding bit located: 0x15C7?
mOwner->writeInt16(0); // language code
mOwner->writeInt16(0); // predefined
mOwner->endBox();
}
void MPEG4Writer::Track::writeDamrBox() {
// 3gpp2 Spec AMRSampleEntry fields
mOwner->beginBox("damr");
mOwner->writeCString(" "); // vendor: 4 bytes
mOwner->writeInt8(0); // decoder version
mOwner->writeInt16(0x83FF); // mode set: all enabled
mOwner->writeInt8(0); // mode change period
mOwner->writeInt8(1); // frames per sample
mOwner->endBox();
}
void MPEG4Writer::Track::writeUrlBox() {
// The table index here refers to the sample description index
// in the sample table entries.
mOwner->beginBox("url ");
mOwner->writeInt32(1); // version=0, flags=1 (self-contained)
mOwner->endBox(); // url
}
void MPEG4Writer::Track::writeDrefBox() {
mOwner->beginBox("dref");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(1); // entry count (either url or urn)
writeUrlBox();
mOwner->endBox(); // dref
}
void MPEG4Writer::Track::writeDinfBox() {
mOwner->beginBox("dinf");
writeDrefBox();
mOwner->endBox(); // dinf
}
void MPEG4Writer::Track::writeAvccBox() {
CHECK(mCodecSpecificData);
CHECK_GE(mCodecSpecificDataSize, 5);
// Patch avcc's lengthSize field to match the number
// of bytes we use to indicate the size of a nal unit.
uint8_t *ptr = (uint8_t *)mCodecSpecificData;
ptr[4] = (ptr[4] & 0xfc) | (mOwner->useNalLengthFour() ? 3 : 1);
mOwner->beginBox("avcC");
mOwner->write(mCodecSpecificData, mCodecSpecificDataSize);
mOwner->endBox(); // avcC
}
void MPEG4Writer::Track::writeD263Box() {
mOwner->beginBox("d263");
mOwner->writeInt32(0); // vendor
mOwner->writeInt8(0); // decoder version
mOwner->writeInt8(10); // level: 10
mOwner->writeInt8(0); // profile: 0
mOwner->endBox(); // d263
}
// This is useful if the pixel is not square
void MPEG4Writer::Track::writePaspBox() {
mOwner->beginBox("pasp");
mOwner->writeInt32(1 << 16); // hspacing
mOwner->writeInt32(1 << 16); // vspacing
mOwner->endBox(); // pasp
}
int32_t MPEG4Writer::Track::getStartTimeOffsetScaledTime() const {
int64_t trackStartTimeOffsetUs = 0;
int64_t moovStartTimeUs = mOwner->getStartTimestampUs();
if (mStartTimestampUs != moovStartTimeUs) {
CHECK_GT(mStartTimestampUs, moovStartTimeUs);
trackStartTimeOffsetUs = mStartTimestampUs - moovStartTimeUs;
}
return (trackStartTimeOffsetUs * mTimeScale + 500000LL) / 1000000LL;
}
void MPEG4Writer::Track::writeSttsBox() {
mOwner->beginBox("stts");
mOwner->writeInt32(0); // version=0, flags=0
uint32_t duration;
CHECK(mSttsTableEntries->get(duration, 1));
duration = htonl(duration); // Back to host byte order
mSttsTableEntries->set(htonl(duration + getStartTimeOffsetScaledTime()), 1);
mSttsTableEntries->write(mOwner);
mOwner->endBox(); // stts
}
void MPEG4Writer::Track::writeCttsBox() {
if (mIsAudio) { // ctts is not for audio
return;
}
// There is no B frame at all
if (mMinCttsOffsetTimeUs == mMaxCttsOffsetTimeUs) {
return;
}
// Do not write ctts box when there is no need to have it.
if (mCttsTableEntries->count() == 0) {
return;
}
ALOGV("ctts box has %d entries with range [%" PRId64 ", %" PRId64 "]",
mCttsTableEntries->count(), mMinCttsOffsetTimeUs, mMaxCttsOffsetTimeUs);
mOwner->beginBox("ctts");
mOwner->writeInt32(0); // version=0, flags=0
uint32_t duration;
CHECK(mCttsTableEntries->get(duration, 1));
duration = htonl(duration); // Back host byte order
mCttsTableEntries->set(htonl(duration + getStartTimeOffsetScaledTime() - mMinCttsOffsetTimeUs), 1);
mCttsTableEntries->write(mOwner);
mOwner->endBox(); // ctts
}
void MPEG4Writer::Track::writeStssBox() {
mOwner->beginBox("stss");
mOwner->writeInt32(0); // version=0, flags=0
mStssTableEntries->write(mOwner);
mOwner->endBox(); // stss
}
void MPEG4Writer::Track::writeStszBox() {
mOwner->beginBox("stsz");
mOwner->writeInt32(0); // version=0, flags=0
mOwner->writeInt32(0);
mStszTableEntries->write(mOwner);
mOwner->endBox(); // stsz
}
void MPEG4Writer::Track::writeStscBox() {
mOwner->beginBox("stsc");
mOwner->writeInt32(0); // version=0, flags=0
mStscTableEntries->write(mOwner);
mOwner->endBox(); // stsc
}
void MPEG4Writer::Track::writeStcoBox(bool use32BitOffset) {
mOwner->beginBox(use32BitOffset? "stco": "co64");
mOwner->writeInt32(0); // version=0, flags=0
if (use32BitOffset) {
mStcoTableEntries->write(mOwner);
} else {
mCo64TableEntries->write(mOwner);
}
mOwner->endBox(); // stco or co64
}
void MPEG4Writer::writeUdtaBox() {
beginBox("udta");
writeGeoDataBox();
endBox();
}
void MPEG4Writer::writeHdlr() {
beginBox("hdlr");
writeInt32(0); // Version, Flags
writeInt32(0); // Predefined
writeFourcc("mdta");
writeInt32(0); // Reserved[0]
writeInt32(0); // Reserved[1]
writeInt32(0); // Reserved[2]
writeInt8(0); // Name (empty)
endBox();
}
void MPEG4Writer::writeKeys() {
size_t count = mMetaKeys->countEntries();
beginBox("keys");
writeInt32(0); // Version, Flags
writeInt32(count); // Entry_count
for (size_t i = 0; i < count; i++) {
AMessage::Type type;
const char *key = mMetaKeys->getEntryNameAt(i, &type);
size_t n = strlen(key);
writeInt32(n + 8);
writeFourcc("mdta");
write(key, n); // write without the \0
}
endBox();
}
void MPEG4Writer::writeIlst() {
size_t count = mMetaKeys->countEntries();
beginBox("ilst");
for (size_t i = 0; i < count; i++) {
beginBox(i + 1); // key id (1-based)
beginBox("data");
AMessage::Type type;
const char *key = mMetaKeys->getEntryNameAt(i, &type);
switch (type) {
case AMessage::kTypeString:
{
AString val;
CHECK(mMetaKeys->findString(key, &val));
writeInt32(1); // type = UTF8
writeInt32(0); // default country/language
write(val.c_str(), strlen(val.c_str())); // write without \0
break;
}
case AMessage::kTypeFloat:
{
float val;
CHECK(mMetaKeys->findFloat(key, &val));
writeInt32(23); // type = float32
writeInt32(0); // default country/language
writeInt32(*reinterpret_cast<int32_t *>(&val));
break;
}
case AMessage::kTypeInt32:
{
int32_t val;
CHECK(mMetaKeys->findInt32(key, &val));
writeInt32(67); // type = signed int32
writeInt32(0); // default country/language
writeInt32(val);
break;
}
default:
{
ALOGW("Unsupported key type, writing 0 instead");
writeInt32(77); // type = unsigned int32
writeInt32(0); // default country/language
writeInt32(0);
break;
}
}
endBox(); // data
endBox(); // key id
}
endBox(); // ilst
}
void MPEG4Writer::writeMetaBox() {
size_t count = mMetaKeys->countEntries();
if (count == 0) {
return;
}
beginBox("meta");
writeHdlr();
writeKeys();
writeIlst();
endBox();
}
/*
* Geodata is stored according to ISO-6709 standard.
*/
void MPEG4Writer::writeGeoDataBox() {
beginBox("\xA9xyz");
/*
* For historical reasons, any user data start
* with "\0xA9", must be followed by its assoicated
* language code.
* 0x0012: text string length
* 0x15c7: lang (locale) code: en
*/
writeInt32(0x001215c7);
writeLatitude(mLatitudex10000);
writeLongitude(mLongitudex10000);
writeInt8(0x2F);
endBox();
}
} // namespace android