4 #include "../exceptions.h" 5 #include "../mediafileinfo.h" 6 #include "../backuphelper.h" 8 #include <c++utilities/conversion/stringbuilder.h> 9 #include <c++utilities/io/binaryreader.h> 10 #include <c++utilities/io/binarywriter.h> 11 #include <c++utilities/io/copy.h> 12 #include <c++utilities/io/catchiofailure.h> 35 Mp4Container::Mp4Container(
MediaFileInfo &fileInfo, uint64 startOffset) :
54 if(mediaDataAtom && userDataAtom) {
66 if(mediaDataAtom && movieAtom) {
91 const string context(
"parsing tags of MP4 container");
94 bool surplusMetaAtoms =
false;
97 m_tags.emplace_back(make_unique<Mp4Tag>());
99 m_tags.back()->parse(*metaAtom);
105 surplusMetaAtoms =
true;
111 if(surplusMetaAtoms) {
120 static const string context(
"parsing tracks of MP4 container");
126 if(mvhdAtom->dataSize() > 0) {
127 stream().seekg(mvhdAtom->dataOffset());
129 if((version == 1 && mvhdAtom->dataSize() >= 32) || (mvhdAtom->dataSize() >= 20)) {
130 stream().seekg(3, ios_base::cur);
133 m_creationTime = DateTime::fromDate(1904, 1, 1) + TimeSpan::fromSeconds(
reader().readUInt32BE());
139 m_creationTime = DateTime::fromDate(1904, 1, 1) + TimeSpan::fromSeconds(
reader().readUInt64BE());
157 if(
Mp4Atom *mehdAtom = moovAtom->
subelementByPath({Mp4AtomIds::MovieExtends, Mp4AtomIds::MovieExtendsHeader})) {
159 if(mehdAtom->dataSize() > 0) {
160 stream().seekg(mehdAtom->dataOffset());
161 unsigned int durationSize =
reader().readByte() == 1u ? 8u : 4u;
162 if(mehdAtom->dataSize() >= 4 + durationSize) {
163 stream().seekg(3, ios_base::cur);
164 switch(durationSize) {
189 m_tracks.emplace_back(make_unique<Mp4Track>(*trakAtom));
222 static const string context(
"making MP4 container");
250 uint64 newPaddingEnd;
252 uint64 currentOffset;
254 vector<tuple<istream *, vector<uint64>, vector<uint64> > > trackInfos;
256 vector<int64> origMediaDataOffsets;
258 vector<int64> newMediaDataOffsets;
260 uint64 movieAtomSize, userDataAtomSize;
265 Mp4Atom *fileTypeAtom, *progressiveDownloadInfoAtom, *movieAtom, *firstMediaDataAtom, *firstMovieFragmentAtom, *userDataAtom, *metaAtom;
266 Mp4Atom *level0Atom, *level1Atom, *level2Atom, *lastAtomToBeWritten;
295 if(writeChunkByChunk) {
305 for(firstMediaDataAtom =
nullptr, level0Atom =
firstElement(); level0Atom; level0Atom = level0Atom->
nextSibling()) {
307 switch(level0Atom->
id()) {
312 firstMediaDataAtom = level0Atom;
319 if(firstMediaDataAtom) {
323 newTagPos = currentTagPos;
330 if(firstMovieFragmentAtom) {
357 vector<Mp4TagMaker> tagMaker;
359 tagMaker.reserve(
m_tags.size());
363 tagsSize += tagMaker.back().requiredSize();
371 movieAtomSize = userDataAtomSize = 0;
377 switch(level1Atom->
id()) {
382 switch(level2Atom->
id()) {
388 userDataAtomSize += level2Atom->
totalSize();
399 if(!writeChunkByChunk) {
400 movieAtomSize += level1Atom->
totalSize();
406 movieAtomSize += level1Atom->
totalSize();
413 if(userDataAtomSize += tagsSize) {
415 movieAtomSize += userDataAtomSize;
419 if(writeChunkByChunk) {
439 if(!rewriteRequired) {
441 uint64 currentSum = 0;
442 for(
Mp4Atom *level0Atom = firstMediaDataAtom; level0Atom; level0Atom = level0Atom->
nextSibling()) {
444 switch(level0Atom->
id()) {
451 newPaddingEnd += currentSum;
453 lastAtomToBeWritten = level0Atom;
460 if(rewriteRequired) {
464 currentOffset = fileTypeAtom->
totalSize();
467 if(progressiveDownloadInfoAtom) {
468 currentOffset += progressiveDownloadInfoAtom->
totalSize();
475 currentOffset += movieAtomSize;
482 if(!(rewriteRequired = firstMediaDataAtom && currentOffset > firstMediaDataAtom->
startOffset())) {
488 newPadding = firstMediaDataAtom->
startOffset() - currentOffset;
491 if(rewriteRequired) {
497 rewriteRequired =
false;
504 goto calculatePadding;
525 NativeFileStream backupStream;
526 BinaryWriter outputWriter(&outputStream);
528 if(rewriteRequired) {
529 if(
fileInfo().saveFilePath().empty()) {
534 outputStream.open(
fileInfo().path(), ios_base::out | ios_base::binary | ios_base::trunc);
536 const char *what = catchIoFailure();
538 throwIoFailure(what);
543 backupStream.exceptions(ios_base::badbit | ios_base::failbit);
544 backupStream.open(
fileInfo().path(), ios_base::in | ios_base::binary);
546 outputStream.open(
fileInfo().saveFilePath(), ios_base::out | ios_base::binary | ios_base::trunc);
548 const char *what = catchIoFailure();
550 throwIoFailure(what);
563 outputStream.open(
fileInfo().path(), ios_base::in | ios_base::out | ios_base::binary);
565 const char *what = catchIoFailure();
567 throwIoFailure(what);
579 if(progressiveDownloadInfoAtom) {
580 progressiveDownloadInfoAtom->
copyBuffer(outputStream);
585 for(byte pass = 0; pass != 2; ++pass) {
592 if(writeChunkByChunk) {
602 switch(level1Atom->
id()) {
607 if(!writeChunkByChunk) {
621 if(userDataAtomSize) {
629 switch(level2Atom->
id()) {
642 for(
auto &maker : tagMaker) {
643 maker.make(outputStream);
651 if(newPadding < 0xFFFFFFFF) {
652 outputWriter.writeUInt32BE(newPadding);
656 outputWriter.writeUInt32BE(1);
658 outputWriter.writeUInt64BE(newPadding);
663 for(; newPadding; --newPadding) {
669 if(rewriteRequired) {
670 for(level0Atom = firstMediaDataAtom; level0Atom; level0Atom = level0Atom->
nextSibling()) {
672 switch(level0Atom->
id()) {
677 if(writeChunkByChunk) {
682 origMediaDataOffsets.push_back(level0Atom->
startOffset());
683 newMediaDataOffsets.push_back(outputStream.tellp());
695 if(writeChunkByChunk) {
697 updateStatus(
"Reading chunk offsets and sizes from the original file ...");
699 uint64 totalChunkCount = 0;
700 uint64 totalMediaDataSize = 0;
715 const vector<uint64> &chunkOffsetTable = get<1>(trackInfos.back());
716 const vector<uint64> &chunkSizesTable = get<2>(trackInfos.back());
723 totalMediaDataSize = accumulate(chunkSizesTable.cbegin(), chunkSizesTable.cend(), totalMediaDataSize);
733 uint64 chunkIndexWithinTrack = 0, totalChunksCopied = 0;
734 bool anyChunksCopied;
741 anyChunksCopied =
false;
742 for(
size_t trackIndex = 0; trackIndex <
trackCount; ++trackIndex) {
744 auto &trackInfo = trackInfos[trackIndex];
745 istream &sourceStream = *get<0>(trackInfo);
746 vector<uint64> &chunkOffsetTable = get<1>(trackInfo);
747 const vector<uint64> &chunkSizesTable = get<2>(trackInfo);
750 if(chunkIndexWithinTrack < chunkOffsetTable.size() && chunkIndexWithinTrack < chunkSizesTable.size()) {
752 sourceStream.seekg(chunkOffsetTable[chunkIndexWithinTrack]);
753 chunkOffsetTable[chunkIndexWithinTrack] = outputStream.tellp();
754 copyHelper.copy(sourceStream, outputStream, chunkSizesTable[chunkIndexWithinTrack]);
757 anyChunksCopied =
true;
763 if(++chunkIndexWithinTrack % 10) {
767 }
while(anyChunksCopied);
772 for(
Mp4Atom *level0Atom = firstMediaDataAtom; level0Atom; level0Atom = level0Atom->
nextSibling()) {
774 switch(level0Atom->
id()) {
777 outputStream.seekp(4, ios_base::cur);
781 outputStream.seekp(level0Atom->
totalSize(), ios_base::cur);
783 if(level0Atom == lastAtomToBeWritten) {
793 if(rewriteRequired) {
802 outputStream.close();
803 outputStream.open(
fileInfo().path(), ios_base::in | ios_base::out | ios_base::binary);
806 const auto newSize =
static_cast<uint64
>(outputStream.tellp());
810 outputStream.close();
812 if(truncate(
fileInfo().path().c_str(), newSize) == 0) {
818 outputStream.open(
fileInfo().path(), ios_base::in | ios_base::out | ios_base::binary);
833 if(rewriteRequired) {
837 "Unable to update chunk offsets (\"stco\"-atom): Number of tracks in the output file (" 838 % numberToString(
tracks().size())
839 %
") differs from the number of tracks in the original file (" 846 if(writeChunkByChunk) {
847 updateStatus(
"Updating chunk offset table for each track ...");
848 for(
size_t trackIndex = 0; trackIndex <
trackCount; ++trackIndex) {
850 const auto &chunkOffsetTable = get<1>(trackInfos[trackIndex]);
854 addNotification(
NotificationType::Critical,
"Unable to update chunk offsets of track " % numberToString(trackIndex + 1) +
": Number of chunks in the output file differs from the number of chunks in the orignal file.", context);
859 updateOffsets(origMediaDataOffsets, newMediaDataOffsets);
866 outputStream.flush();
886 void Mp4Container::updateOffsets(
const std::vector<int64> &oldMdatOffsets,
const std::vector<int64> &newMdatOffsets)
889 updateStatus(
"Updating chunk offset table for each track ...");
890 const string context(
"updating MP4 container chunk offset table");
904 int tfhdAtomCount = 0;
909 if(tfhdAtom->dataSize() >= 8) {
910 stream().seekg(tfhdAtom->dataOffset() + 1);
911 uint32 flags =
reader().readUInt24BE();
913 if(tfhdAtom->dataSize() >= 16) {
914 stream().seekg(4, ios_base::cur);
915 uint64 off =
reader().readUInt64BE();
916 for(
auto iOld = oldMdatOffsets.cbegin(), iNew = newMdatOffsets.cbegin(), end = oldMdatOffsets.cend();
917 iOld != end; ++iOld, ++iNew) {
918 if(off >= static_cast<uint64>(*iOld)) {
919 off += (*iNew - *iOld);
920 stream().seekp(tfhdAtom->dataOffset() + 8);
921 writer().writeUInt64BE(off);
933 switch(tfhdAtomCount) {
Contains utility classes helping to read and write streams.