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;
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) {
355 vector<Mp4TagMaker> tagMaker;
357 tagMaker.reserve(
m_tags.size());
361 tagsSize += tagMaker.back().requiredSize();
369 movieAtomSize = userDataAtomSize = 0;
375 switch(level1Atom->
id()) {
380 switch(level2Atom->
id()) {
386 userDataAtomSize += level2Atom->
totalSize();
397 if(!writeChunkByChunk) {
398 movieAtomSize += level1Atom->
totalSize();
404 movieAtomSize += level1Atom->
totalSize();
411 if(userDataAtomSize += tagsSize) {
413 movieAtomSize += userDataAtomSize;
417 if(writeChunkByChunk) {
437 if(!rewriteRequired) {
439 uint64 currentSum = 0;
440 for(
Mp4Atom *level0Atom = firstMediaDataAtom; level0Atom; level0Atom = level0Atom->
nextSibling()) {
442 switch(level0Atom->
id()) {
449 newPaddingEnd += currentSum;
451 lastAtomToBeWritten = level0Atom;
458 if(rewriteRequired) {
462 currentOffset = fileTypeAtom->
totalSize();
465 if(progressiveDownloadInfoAtom) {
466 currentOffset += progressiveDownloadInfoAtom->
totalSize();
473 currentOffset += movieAtomSize;
480 if(!(rewriteRequired = firstMediaDataAtom && currentOffset > firstMediaDataAtom->
startOffset())) {
486 newPadding = firstMediaDataAtom->
startOffset() - currentOffset;
489 if(rewriteRequired) {
495 rewriteRequired =
false;
502 goto calculatePadding;
523 NativeFileStream backupStream;
524 BinaryWriter outputWriter(&outputStream);
526 if(rewriteRequired) {
527 if(
fileInfo().saveFilePath().empty()) {
532 outputStream.open(
fileInfo().path(), ios_base::out | ios_base::binary | ios_base::trunc);
534 const char *what = catchIoFailure();
536 throwIoFailure(what);
541 backupStream.exceptions(ios_base::badbit | ios_base::failbit);
542 backupStream.open(
fileInfo().path(), ios_base::in | ios_base::binary);
544 outputStream.open(
fileInfo().saveFilePath(), ios_base::out | ios_base::binary | ios_base::trunc);
546 const char *what = catchIoFailure();
548 throwIoFailure(what);
561 outputStream.open(
fileInfo().path(), ios_base::in | ios_base::out | ios_base::binary);
563 const char *what = catchIoFailure();
565 throwIoFailure(what);
577 if(progressiveDownloadInfoAtom) {
578 progressiveDownloadInfoAtom->
copyBuffer(outputStream);
593 for(byte pass = 0; pass != 2; ++pass) {
600 if(writeChunkByChunk) {
610 switch(level1Atom->
id()) {
615 if(!writeChunkByChunk) {
629 if(userDataAtomSize) {
637 switch(level2Atom->
id()) {
650 for(
auto &maker : tagMaker) {
651 maker.make(outputStream);
659 if(newPadding < 0xFFFFFFFF) {
660 outputWriter.writeUInt32BE(newPadding);
664 outputWriter.writeUInt32BE(1);
666 outputWriter.writeUInt64BE(newPadding);
671 for(; newPadding; --newPadding) {
677 if(rewriteRequired) {
678 for(level0Atom = firstMediaDataAtom; level0Atom; level0Atom = level0Atom->
nextSibling()) {
680 switch(level0Atom->
id()) {
685 if(writeChunkByChunk) {
690 origMediaDataOffsets.push_back(level0Atom->
startOffset());
691 newMediaDataOffsets.push_back(outputStream.tellp());
703 if(writeChunkByChunk) {
705 updateStatus(
"Reading chunk offsets and sizes from the original file ...");
707 uint64 totalChunkCount = 0;
708 uint64 totalMediaDataSize = 0;
718 const vector<uint64> &chunkOffsetTable = get<1>(trackInfos.back());
719 const vector<uint64> &chunkSizesTable = get<2>(trackInfos.back());
726 totalMediaDataSize += accumulate(chunkSizesTable.cbegin(), chunkSizesTable.cend(), totalMediaDataSize);
736 uint64 chunkIndexWithinTrack = 0, totalChunksCopied = 0;
737 bool anyChunksCopied;
744 anyChunksCopied =
false;
745 for(
size_t trackIndex = 0; trackIndex <
trackCount; ++trackIndex) {
747 auto &trackInfo = trackInfos[trackIndex];
748 istream &sourceStream = *get<0>(trackInfo);
749 vector<uint64> &chunkOffsetTable = get<1>(trackInfo);
750 const vector<uint64> &chunkSizesTable = get<2>(trackInfo);
753 if(chunkIndexWithinTrack < chunkOffsetTable.size() && chunkIndexWithinTrack < chunkSizesTable.size()) {
755 sourceStream.seekg(chunkOffsetTable[chunkIndexWithinTrack]);
756 chunkOffsetTable[chunkIndexWithinTrack] = outputStream.tellp();
757 copyHelper.copy(sourceStream, outputStream, chunkSizesTable[chunkIndexWithinTrack]);
760 anyChunksCopied =
true;
766 if(!(++chunkIndexWithinTrack % 10)) {
770 }
while(anyChunksCopied);
775 for(
Mp4Atom *level0Atom = firstMediaDataAtom; level0Atom; level0Atom = level0Atom->
nextSibling()) {
777 switch(level0Atom->
id()) {
780 outputStream.seekp(4, ios_base::cur);
784 outputStream.seekp(level0Atom->
totalSize(), ios_base::cur);
786 if(level0Atom == lastAtomToBeWritten) {
796 if(rewriteRequired) {
805 outputStream.close();
806 outputStream.open(
fileInfo().path(), ios_base::in | ios_base::out | ios_base::binary);
809 const auto newSize =
static_cast<uint64
>(outputStream.tellp());
813 outputStream.close();
815 if(truncate(
fileInfo().path().c_str(), newSize) == 0) {
821 outputStream.open(
fileInfo().path(), ios_base::in | ios_base::out | ios_base::binary);
836 if(rewriteRequired) {
840 argsToString(
"Unable to update chunk offsets (\"stco\"-atom): Number of tracks in the output file (",
842 ") differs from the number of tracks in the original file (",
849 if(writeChunkByChunk) {
850 updateStatus(
"Updating chunk offset table for each track ...");
851 for(
size_t trackIndex = 0; trackIndex !=
trackCount; ++trackIndex) {
853 const auto &chunkOffsetTable = get<1>(trackInfos[trackIndex]);
857 addNotification(
NotificationType::Critical, argsToString(
"Unable to update chunk offsets of track ", (trackIndex + 1),
": Number of chunks in the output file differs from the number of chunks in the orignal file."), context);
862 updateOffsets(origMediaDataOffsets, newMediaDataOffsets);
869 outputStream.flush();
889 void Mp4Container::updateOffsets(
const std::vector<int64> &oldMdatOffsets,
const std::vector<int64> &newMdatOffsets)
892 updateStatus(
"Updating chunk offset table for each track ...");
893 const string context(
"updating MP4 container chunk offset table");
907 int tfhdAtomCount = 0;
912 if(tfhdAtom->dataSize() >= 8) {
913 stream().seekg(tfhdAtom->dataOffset() + 1);
914 uint32 flags =
reader().readUInt24BE();
916 if(tfhdAtom->dataSize() >= 16) {
917 stream().seekg(4, ios_base::cur);
918 uint64 off =
reader().readUInt64BE();
919 for(
auto iOld = oldMdatOffsets.cbegin(), iNew = newMdatOffsets.cbegin(), end = oldMdatOffsets.cend();
920 iOld != end; ++iOld, ++iNew) {
921 if(off >= static_cast<uint64>(*iOld)) {
922 off += (*iNew - *iOld);
923 stream().seekp(tfhdAtom->dataOffset() + 8);
924 writer().writeUInt64BE(off);
936 switch(tfhdAtomCount) {
Contains utility classes helping to read and write streams.