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gecko-dev/dom/media/mp4/MoofParser.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "MoofParser.h"
#include "Box.h"
#include "SinfParser.h"
#include <limits>
#include "MP4Interval.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/HelperMacros.h"
#include "mozilla/Logging.h"
#if defined(MOZ_FMP4)
extern mozilla::LogModule* GetDemuxerLog();
# define LOG_ERROR(name, arg, ...) \
MOZ_LOG( \
GetDemuxerLog(), mozilla::LogLevel::Error, \
(MOZ_STRINGIFY(name) "(%p)::%s: " arg, this, __func__, ##__VA_ARGS__))
# define LOG_WARN(name, arg, ...) \
MOZ_LOG( \
GetDemuxerLog(), mozilla::LogLevel::Warning, \
(MOZ_STRINGIFY(name) "(%p)::%s: " arg, this, __func__, ##__VA_ARGS__))
# define LOG_DEBUG(name, arg, ...) \
MOZ_LOG( \
GetDemuxerLog(), mozilla::LogLevel::Debug, \
(MOZ_STRINGIFY(name) "(%p)::%s: " arg, this, __func__, ##__VA_ARGS__))
#else
# define LOG_ERROR(...)
# define LOG_WARN(...)
# define LOG_DEBUG(...)
#endif
namespace mozilla {
const uint32_t kKeyIdSize = 16;
// We ensure there are no gaps in samples' CTS between the last sample in a
// Moof, and the first sample in the next Moof, if they're within these many
// Microseconds of each other.
const Microseconds CROSS_MOOF_CTS_MERGE_THRESHOLD = 1;
bool MoofParser::RebuildFragmentedIndex(const MediaByteRangeSet& aByteRanges) {
BoxContext context(mSource, aByteRanges);
return RebuildFragmentedIndex(context);
}
bool MoofParser::RebuildFragmentedIndex(const MediaByteRangeSet& aByteRanges,
bool* aCanEvict) {
MOZ_ASSERT(aCanEvict);
if (*aCanEvict && mMoofs.Length() > 1) {
MOZ_ASSERT(mMoofs.Length() == mMediaRanges.Length());
mMoofs.RemoveElementsAt(0, mMoofs.Length() - 1);
mMediaRanges.RemoveElementsAt(0, mMediaRanges.Length() - 1);
*aCanEvict = true;
} else {
*aCanEvict = false;
}
return RebuildFragmentedIndex(aByteRanges);
}
bool MoofParser::RebuildFragmentedIndex(BoxContext& aContext) {
LOG_DEBUG(
Moof,
"Starting, mTrackParseMode=%s, track#=%" PRIu32
" (ignore if multitrack).",
mTrackParseMode.is<ParseAllTracks>() ? "multitrack" : "single track",
mTrackParseMode.is<ParseAllTracks>() ? 0
: mTrackParseMode.as<uint32_t>());
bool foundValidMoof = false;
for (Box box(&aContext, mOffset); box.IsAvailable(); box = box.Next()) {
if (box.IsType("moov") && mInitRange.IsEmpty()) {
mInitRange = MediaByteRange(0, box.Range().mEnd);
ParseMoov(box);
} else if (box.IsType("moof")) {
Moof moof(box, mTrackParseMode, mTrex, mMvhd, mMdhd, mEdts, mSinf,
&mLastDecodeTime, mIsAudio, mTracksEndCts);
if (!moof.IsValid() && !box.Next().IsAvailable()) {
// Moof isn't valid abort search for now.
LOG_WARN(Moof,
"Could not find valid moof, moof may not be complete yet.");
break;
}
if (!mMoofs.IsEmpty()) {
// Stitch time ranges together in the case of a (hopefully small) time
// range gap between moofs.
mMoofs.LastElement().FixRounding(moof);
}
mMoofs.AppendElement(moof);
mMediaRanges.AppendElement(moof.mRange);
foundValidMoof = true;
} else if (box.IsType("mdat") && !Moofs().IsEmpty()) {
// Check if we have all our data from last moof.
Moof& moof = Moofs().LastElement();
media::Interval<int64_t> datarange(moof.mMdatRange.mStart,
moof.mMdatRange.mEnd, 0);
media::Interval<int64_t> mdat(box.Range().mStart, box.Range().mEnd, 0);
if (datarange.Intersects(mdat)) {
mMediaRanges.LastElement() =
mMediaRanges.LastElement().Span(box.Range());
}
}
mOffset = box.NextOffset();
}
MOZ_ASSERT(mTrackParseMode.is<ParseAllTracks>() ||
mTrex.mTrackId == mTrackParseMode.as<uint32_t>(),
"If not parsing all tracks, mTrex should have the same track id "
"as the track being parsed.");
LOG_DEBUG(Moof, "Done, foundValidMoof=%s.",
foundValidMoof ? "true" : "false");
return foundValidMoof;
}
MediaByteRange MoofParser::FirstCompleteMediaHeader() {
if (Moofs().IsEmpty()) {
return MediaByteRange();
}
return Moofs()[0].mRange;
}
MediaByteRange MoofParser::FirstCompleteMediaSegment() {
for (uint32_t i = 0; i < mMediaRanges.Length(); i++) {
if (mMediaRanges[i].Contains(Moofs()[i].mMdatRange)) {
return mMediaRanges[i];
}
}
return MediaByteRange();
}
DDLoggedTypeDeclNameAndBase(BlockingStream, ByteStream);
class BlockingStream : public ByteStream,
public DecoderDoctorLifeLogger<BlockingStream> {
public:
explicit BlockingStream(ByteStream* aStream) : mStream(aStream) {
DDLINKCHILD("stream", aStream);
}
bool ReadAt(int64_t offset, void* data, size_t size,
size_t* bytes_read) override {
return mStream->ReadAt(offset, data, size, bytes_read);
}
bool CachedReadAt(int64_t offset, void* data, size_t size,
size_t* bytes_read) override {
return mStream->ReadAt(offset, data, size, bytes_read);
}
virtual bool Length(int64_t* size) override { return mStream->Length(size); }
private:
RefPtr<ByteStream> mStream;
};
bool MoofParser::BlockingReadNextMoof() {
LOG_DEBUG(Moof, "Starting.");
int64_t length = std::numeric_limits<int64_t>::max();
mSource->Length(&length);
RefPtr<BlockingStream> stream = new BlockingStream(mSource);
MediaByteRangeSet byteRanges(MediaByteRange(0, length));
BoxContext context(stream, byteRanges);
for (Box box(&context, mOffset); box.IsAvailable(); box = box.Next()) {
if (box.IsType("moof")) {
MediaByteRangeSet parseByteRanges(
MediaByteRange(mOffset, box.Range().mEnd));
BoxContext parseContext(stream, parseByteRanges);
if (RebuildFragmentedIndex(parseContext)) {
LOG_DEBUG(Moof, "Succeeded on RebuildFragmentedIndex, returning true.");
return true;
}
}
}
LOG_DEBUG(Moof, "Couldn't read next moof, returning false.");
return false;
}
void MoofParser::ScanForMetadata(mozilla::MediaByteRange& aMoov) {
LOG_DEBUG(Moof, "Starting.");
int64_t length = std::numeric_limits<int64_t>::max();
mSource->Length(&length);
MediaByteRangeSet byteRanges;
byteRanges += MediaByteRange(0, length);
RefPtr<BlockingStream> stream = new BlockingStream(mSource);
BoxContext context(stream, byteRanges);
for (Box box(&context, mOffset); box.IsAvailable(); box = box.Next()) {
if (box.IsType("moov")) {
aMoov = box.Range();
break;
}
}
mInitRange = aMoov;
LOG_DEBUG(Moof,
"Done, mInitRange.mStart=%" PRIi64 ", mInitRange.mEnd=%" PRIi64,
mInitRange.mStart, mInitRange.mEnd);
}
already_AddRefed<mozilla::MediaByteBuffer> MoofParser::Metadata() {
LOG_DEBUG(Moof, "Starting.");
MediaByteRange moov;
ScanForMetadata(moov);
CheckedInt<MediaByteBuffer::size_type> moovLength = moov.Length();
if (!moovLength.isValid() || !moovLength.value()) {
// No moov, or cannot be used as array size.
LOG_WARN(Moof,
"Did not get usable moov length while trying to parse Metadata.");
return nullptr;
}
RefPtr<MediaByteBuffer> metadata = new MediaByteBuffer();
if (!metadata->SetLength(moovLength.value(), fallible)) {
LOG_ERROR(Moof, "OOM");
return nullptr;
}
RefPtr<BlockingStream> stream = new BlockingStream(mSource);
size_t read;
bool rv = stream->ReadAt(moov.mStart, metadata->Elements(),
moovLength.value(), &read);
if (!rv || read != moovLength.value()) {
LOG_WARN(Moof, "Failed to read moov while trying to parse Metadata.");
return nullptr;
}
LOG_DEBUG(Moof, "Done, found metadata.");
return metadata.forget();
}
MP4Interval<Microseconds> MoofParser::GetCompositionRange(
const MediaByteRangeSet& aByteRanges) {
LOG_DEBUG(Moof, "Starting.");
MP4Interval<Microseconds> compositionRange;
BoxContext context(mSource, aByteRanges);
for (size_t i = 0; i < mMoofs.Length(); i++) {
Moof& moof = mMoofs[i];
Box box(&context, moof.mRange.mStart);
if (box.IsAvailable()) {
compositionRange = compositionRange.Extents(moof.mTimeRange);
}
}
LOG_DEBUG(Moof,
"Done, compositionRange.start=%" PRIi64
", compositionRange.end=%" PRIi64 ".",
compositionRange.start, compositionRange.end);
return compositionRange;
}
bool MoofParser::ReachedEnd() {
int64_t length;
return mSource->Length(&length) && mOffset == length;
}
void MoofParser::ParseMoov(Box& aBox) {
LOG_DEBUG(Moof, "Starting.");
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("mvhd")) {
mMvhd = Mvhd(box);
} else if (box.IsType("trak")) {
ParseTrak(box);
} else if (box.IsType("mvex")) {
ParseMvex(box);
}
}
LOG_DEBUG(Moof, "Done.");
}
void MoofParser::ParseTrak(Box& aBox) {
LOG_DEBUG(Trak, "Starting.");
Tkhd tkhd;
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("tkhd")) {
tkhd = Tkhd(box);
} else if (box.IsType("mdia")) {
if (mTrackParseMode.is<ParseAllTracks>() ||
tkhd.mTrackId == mTrackParseMode.as<uint32_t>()) {
ParseMdia(box);
}
} else if (box.IsType("edts") &&
(mTrackParseMode.is<ParseAllTracks>() ||
tkhd.mTrackId == mTrackParseMode.as<uint32_t>())) {
mEdts = Edts(box);
}
}
LOG_DEBUG(Trak, "Done.");
}
void MoofParser::ParseMdia(Box& aBox) {
LOG_DEBUG(Mdia, "Starting.");
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("mdhd")) {
mMdhd = Mdhd(box);
} else if (box.IsType("minf")) {
ParseMinf(box);
}
}
LOG_DEBUG(Mdia, "Done.");
}
void MoofParser::ParseMvex(Box& aBox) {
LOG_DEBUG(Mvex, "Starting.");
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("trex")) {
Trex trex = Trex(box);
if (mTrackParseMode.is<ParseAllTracks>() ||
trex.mTrackId == mTrackParseMode.as<uint32_t>()) {
mTrex = trex;
}
}
}
LOG_DEBUG(Mvex, "Done.");
}
void MoofParser::ParseMinf(Box& aBox) {
LOG_DEBUG(Minf, "Starting.");
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("stbl")) {
ParseStbl(box);
}
}
LOG_DEBUG(Minf, "Done.");
}
void MoofParser::ParseStbl(Box& aBox) {
LOG_DEBUG(Stbl, "Starting.");
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("stsd")) {
ParseStsd(box);
} else if (box.IsType("sgpd")) {
Sgpd sgpd(box);
if (sgpd.IsValid() && sgpd.mGroupingType == "seig") {
mTrackSampleEncryptionInfoEntries.Clear();
if (!mTrackSampleEncryptionInfoEntries.AppendElements(
sgpd.mEntries, mozilla::fallible)) {
LOG_ERROR(Stbl, "OOM");
return;
}
}
} else if (box.IsType("sbgp")) {
Sbgp sbgp(box);
if (sbgp.IsValid() && sbgp.mGroupingType == "seig") {
mTrackSampleToGroupEntries.Clear();
if (!mTrackSampleToGroupEntries.AppendElements(sbgp.mEntries,
mozilla::fallible)) {
LOG_ERROR(Stbl, "OOM");
return;
}
}
}
}
LOG_DEBUG(Stbl, "Done.");
}
void MoofParser::ParseStsd(Box& aBox) {
LOG_DEBUG(Stsd, "Starting.");
if (mTrackParseMode.is<ParseAllTracks>()) {
// It is not a sane operation to try and map sample description boxes from
// multiple tracks onto the parser, which is modeled around storing metadata
// for a single track.
LOG_DEBUG(Stsd, "Early return due to multitrack parser.");
return;
}
MOZ_ASSERT(
mSampleDescriptions.IsEmpty(),
"Shouldn't have any sample descriptions yet when starting to parse stsd");
uint32_t numberEncryptedEntries = 0;
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
SampleDescriptionEntry sampleDescriptionEntry{false};
if (box.IsType("encv") || box.IsType("enca")) {
ParseEncrypted(box);
sampleDescriptionEntry.mIsEncryptedEntry = true;
numberEncryptedEntries++;
}
if (!mSampleDescriptions.AppendElement(sampleDescriptionEntry,
mozilla::fallible)) {
LOG_ERROR(Stsd, "OOM");
return;
}
}
if (mSampleDescriptions.IsEmpty()) {
LOG_WARN(Stsd,
"No sample description entries found while parsing Stsd! This "
"shouldn't happen, as the spec requires one for each track!");
}
if (numberEncryptedEntries > 1) {
LOG_WARN(Stsd,
"More than one encrypted sample description entry found while "
"parsing track! We don't expect this, and it will likely break "
"during fragment look up!");
}
LOG_DEBUG(Stsd,
"Done, numberEncryptedEntries=%" PRIu32
", mSampleDescriptions.Length=%zu",
numberEncryptedEntries, mSampleDescriptions.Length());
}
void MoofParser::ParseEncrypted(Box& aBox) {
LOG_DEBUG(Moof, "Starting.");
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
// Some MP4 files have been found to have multiple sinf boxes in the same
// enc* box. This does not match spec anyway, so just choose the first
// one that parses properly.
if (box.IsType("sinf")) {
mSinf = Sinf(box);
if (mSinf.IsValid()) {
break;
}
}
}
LOG_DEBUG(Moof, "Done.");
}
class CtsComparator {
public:
bool Equals(Sample* const aA, Sample* const aB) const {
return aA->mCompositionRange.start == aB->mCompositionRange.start;
}
bool LessThan(Sample* const aA, Sample* const aB) const {
return aA->mCompositionRange.start < aB->mCompositionRange.start;
}
};
Moof::Moof(Box& aBox, const TrackParseMode& aTrackParseMode, Trex& aTrex,
Mvhd& aMvhd, Mdhd& aMdhd, Edts& aEdts, Sinf& aSinf,
uint64_t* aDecodeTime, bool aIsAudio,
nsTArray<TrackEndCts>& aTracksEndCts)
: mRange(aBox.Range()), mTfhd(aTrex), mMaxRoundingError(35000) {
LOG_DEBUG(
Moof,
"Starting, aTrackParseMode=%s, track#=%" PRIu32
" (ignore if multitrack).",
aTrackParseMode.is<ParseAllTracks>() ? "multitrack" : "single track",
aTrackParseMode.is<ParseAllTracks>() ? 0
: aTrackParseMode.as<uint32_t>());
MOZ_ASSERT(aTrackParseMode.is<ParseAllTracks>() ||
aTrex.mTrackId == aTrackParseMode.as<uint32_t>(),
"If not parsing all tracks, aTrex should have the same track id "
"as the track being parsed.");
nsTArray<Box> psshBoxes;
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("traf")) {
ParseTraf(box, aTrackParseMode, aTrex, aMvhd, aMdhd, aEdts, aSinf,
aDecodeTime, aIsAudio);
}
if (box.IsType("pssh")) {
psshBoxes.AppendElement(box);
}
}
// The EME spec requires that PSSH boxes which are contiguous in the
// file are dispatched to the media element in a single "encrypted" event.
// So append contiguous boxes here.
for (size_t i = 0; i < psshBoxes.Length(); ++i) {
Box box = psshBoxes[i];
if (i == 0 || box.Offset() != psshBoxes[i - 1].NextOffset()) {
mPsshes.AppendElement();
}
nsTArray<uint8_t>& pssh = mPsshes.LastElement();
pssh.AppendElements(std::move(box.ReadCompleteBox()));
}
if (IsValid()) {
if (mIndex.Length()) {
// Ensure the samples are contiguous with no gaps.
nsTArray<Sample*> ctsOrder;
for (auto& sample : mIndex) {
ctsOrder.AppendElement(&sample);
}
ctsOrder.Sort(CtsComparator());
for (size_t i = 1; i < ctsOrder.Length(); i++) {
ctsOrder[i - 1]->mCompositionRange.end =
ctsOrder[i]->mCompositionRange.start;
}
// Ensure that there are no gaps between the first sample in this
// Moof and the preceeding Moof.
if (!ctsOrder.IsEmpty()) {
bool found = false;
// Track ID of the track we're parsing.
const uint32_t trackId = aTrex.mTrackId;
// Find the previous CTS end time of Moof preceeding the Moofs we just
// parsed, for the track we're parsing.
for (auto& prevCts : aTracksEndCts) {
if (prevCts.mTrackId == trackId) {
// We have previously parsed a Moof for this track. Smooth the gap
// between samples for this track across the Moof bounary.
if (ctsOrder[0]->mCompositionRange.start > prevCts.mCtsEndTime &&
ctsOrder[0]->mCompositionRange.start - prevCts.mCtsEndTime <=
CROSS_MOOF_CTS_MERGE_THRESHOLD) {
ctsOrder[0]->mCompositionRange.start = prevCts.mCtsEndTime;
}
prevCts.mCtsEndTime = ctsOrder.LastElement()->mCompositionRange.end;
found = true;
break;
}
}
if (!found) {
// We've not parsed a Moof for this track yet. Save its CTS end
// time for the next Moof we parse.
aTracksEndCts.AppendElement(TrackEndCts(
trackId, ctsOrder.LastElement()->mCompositionRange.end));
}
}
// In MP4, the duration of a sample is defined as the delta between two
// decode timestamps. The operation above has updated the duration of each
// sample as a Sample's duration is mCompositionRange.end -
// mCompositionRange.start MSE's TrackBuffersManager expects dts that
// increased by the sample's duration, so we rewrite the dts accordingly.
int64_t presentationDuration =
ctsOrder.LastElement()->mCompositionRange.end -
ctsOrder[0]->mCompositionRange.start;
auto decodeOffset =
aMdhd.ToMicroseconds((int64_t)*aDecodeTime - aEdts.mMediaStart);
auto offsetOffset = aMvhd.ToMicroseconds(aEdts.mEmptyOffset);
int64_t endDecodeTime =
(decodeOffset.isOk() && offsetOffset.isOk())
? decodeOffset.unwrap() + offsetOffset.unwrap()
: 0;
int64_t decodeDuration = endDecodeTime - mIndex[0].mDecodeTime;
double adjust = !!presentationDuration
? (double)decodeDuration / presentationDuration
: 0;
int64_t dtsOffset = mIndex[0].mDecodeTime;
int64_t compositionDuration = 0;
// Adjust the dts, ensuring that the new adjusted dts will never be
// greater than decodeTime (the next moof's decode start time).
for (auto& sample : mIndex) {
sample.mDecodeTime = dtsOffset + int64_t(compositionDuration * adjust);
compositionDuration += sample.mCompositionRange.Length();
}
mTimeRange = MP4Interval<Microseconds>(
ctsOrder[0]->mCompositionRange.start,
ctsOrder.LastElement()->mCompositionRange.end);
}
ProcessCencAuxInfo(aSinf.mDefaultEncryptionType);
}
LOG_DEBUG(Moof, "Done.");
}
bool Moof::GetAuxInfo(AtomType aType,
FallibleTArray<MediaByteRange>* aByteRanges) {
LOG_DEBUG(Moof, "Starting.");
aByteRanges->Clear();
Saiz* saiz = nullptr;
for (int i = 0;; i++) {
if (i == mSaizs.Length()) {
LOG_DEBUG(Moof, "Could not find saiz matching aType. Returning false.");
return false;
}
if (mSaizs[i].mAuxInfoType == aType) {
saiz = &mSaizs[i];
break;
}
}
Saio* saio = nullptr;
for (int i = 0;; i++) {
if (i == mSaios.Length()) {
LOG_DEBUG(Moof, "Could not find saio matching aType. Returning false.");
return false;
}
if (mSaios[i].mAuxInfoType == aType) {
saio = &mSaios[i];
break;
}
}
if (saio->mOffsets.Length() == 1) {
if (!aByteRanges->SetCapacity(saiz->mSampleInfoSize.Length(),
mozilla::fallible)) {
LOG_ERROR(Moof, "OOM");
return false;
}
uint64_t offset = mRange.mStart + saio->mOffsets[0];
for (size_t i = 0; i < saiz->mSampleInfoSize.Length(); i++) {
if (!aByteRanges->AppendElement(
MediaByteRange(offset, offset + saiz->mSampleInfoSize[i]),
mozilla::fallible)) {
LOG_ERROR(Moof, "OOM");
return false;
}
offset += saiz->mSampleInfoSize[i];
}
LOG_DEBUG(
Moof,
"Saio has 1 entry. aByteRanges populated accordingly. Returning true.");
return true;
}
if (saio->mOffsets.Length() == saiz->mSampleInfoSize.Length()) {
if (!aByteRanges->SetCapacity(saiz->mSampleInfoSize.Length(),
mozilla::fallible)) {
LOG_ERROR(Moof, "OOM");
return false;
}
for (size_t i = 0; i < saio->mOffsets.Length(); i++) {
uint64_t offset = mRange.mStart + saio->mOffsets[i];
if (!aByteRanges->AppendElement(
MediaByteRange(offset, offset + saiz->mSampleInfoSize[i]),
mozilla::fallible)) {
LOG_ERROR(Moof, "OOM");
return false;
}
}
LOG_DEBUG(
Moof,
"Saio and saiz have same number of entries. aByteRanges populated "
"accordingly. Returning true.");
return true;
}
LOG_DEBUG(Moof,
"Moof::GetAuxInfo could not find any Aux info, returning false.");
return false;
}
bool Moof::ProcessCencAuxInfo(AtomType aScheme) {
LOG_DEBUG(Moof, "Starting.");
FallibleTArray<MediaByteRange> cencRanges;
if (!GetAuxInfo(aScheme, &cencRanges) ||
cencRanges.Length() != mIndex.Length()) {
LOG_DEBUG(Moof, "Couldn't find cenc aux info.");
return false;
}
for (int i = 0; i < cencRanges.Length(); i++) {
mIndex[i].mCencRange = cencRanges[i];
}
LOG_DEBUG(Moof, "Found cenc aux info and stored on index.");
return true;
}
void Moof::ParseTraf(Box& aBox, const TrackParseMode& aTrackParseMode,
Trex& aTrex, Mvhd& aMvhd, Mdhd& aMdhd, Edts& aEdts,
Sinf& aSinf, uint64_t* aDecodeTime, bool aIsAudio) {
LOG_DEBUG(
Traf,
"Starting, aTrackParseMode=%s, track#=%" PRIu32
" (ignore if multitrack).",
aTrackParseMode.is<ParseAllTracks>() ? "multitrack" : "single track",
aTrackParseMode.is<ParseAllTracks>() ? 0
: aTrackParseMode.as<uint32_t>());
MOZ_ASSERT(aDecodeTime);
MOZ_ASSERT(aTrackParseMode.is<ParseAllTracks>() ||
aTrex.mTrackId == aTrackParseMode.as<uint32_t>(),
"If not parsing all tracks, aTrex should have the same track id "
"as the track being parsed.");
Tfdt tfdt;
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("tfhd")) {
mTfhd = Tfhd(box, aTrex);
} else if (aTrackParseMode.is<ParseAllTracks>() ||
mTfhd.mTrackId == aTrackParseMode.as<uint32_t>()) {
if (box.IsType("tfdt")) {
tfdt = Tfdt(box);
} else if (box.IsType("sgpd")) {
Sgpd sgpd(box);
if (sgpd.IsValid() && sgpd.mGroupingType == "seig") {
mFragmentSampleEncryptionInfoEntries.Clear();
if (!mFragmentSampleEncryptionInfoEntries.AppendElements(
sgpd.mEntries, mozilla::fallible)) {
LOG_ERROR(Moof, "OOM");
return;
}
}
} else if (box.IsType("sbgp")) {
Sbgp sbgp(box);
if (sbgp.IsValid() && sbgp.mGroupingType == "seig") {
mFragmentSampleToGroupEntries.Clear();
if (!mFragmentSampleToGroupEntries.AppendElements(
sbgp.mEntries, mozilla::fallible)) {
LOG_ERROR(Moof, "OOM");
return;
}
}
} else if (box.IsType("saiz")) {
if (!mSaizs.AppendElement(Saiz(box, aSinf.mDefaultEncryptionType),
mozilla::fallible)) {
LOG_ERROR(Moof, "OOM");
return;
}
} else if (box.IsType("saio")) {
if (!mSaios.AppendElement(Saio(box, aSinf.mDefaultEncryptionType),
mozilla::fallible)) {
LOG_ERROR(Moof, "OOM");
return;
}
}
}
}
if (aTrackParseMode.is<uint32_t>() &&
mTfhd.mTrackId != aTrackParseMode.as<uint32_t>()) {
LOG_DEBUG(Traf,
"Early return as not multitrack parser and track id didn't match "
"mTfhd.mTrackId=%" PRIu32,
mTfhd.mTrackId);
return;
}
// Now search for TRUN boxes.
uint64_t decodeTime =
tfdt.IsValid() ? tfdt.mBaseMediaDecodeTime : *aDecodeTime;
for (Box box = aBox.FirstChild(); box.IsAvailable(); box = box.Next()) {
if (box.IsType("trun")) {
if (ParseTrun(box, aMvhd, aMdhd, aEdts, &decodeTime, aIsAudio).isOk()) {
mValid = true;
} else {
LOG_WARN(Moof, "ParseTrun failed");
mValid = false;
break;
}
}
}
*aDecodeTime = decodeTime;
LOG_DEBUG(Traf, "Done, setting aDecodeTime=%." PRIu64 ".", decodeTime);
}
void Moof::FixRounding(const Moof& aMoof) {
Microseconds gap = aMoof.mTimeRange.start - mTimeRange.end;
if (gap > 0 && gap <= mMaxRoundingError) {
mTimeRange.end = aMoof.mTimeRange.start;
}
}
Result<Ok, nsresult> Moof::ParseTrun(Box& aBox, Mvhd& aMvhd, Mdhd& aMdhd,
Edts& aEdts, uint64_t* aDecodeTime,
bool aIsAudio) {
LOG_DEBUG(Trun, "Starting.");
if (!mTfhd.IsValid() || !aMvhd.IsValid() || !aMdhd.IsValid() ||
!aEdts.IsValid()) {
LOG_WARN(
Moof, "Invalid dependencies: mTfhd(%d) aMvhd(%d) aMdhd(%d) aEdts(%d)",
mTfhd.IsValid(), aMvhd.IsValid(), aMdhd.IsValid(), !aEdts.IsValid());
return Err(NS_ERROR_FAILURE);
}
BoxReader reader(aBox);
if (!reader->CanReadType<uint32_t>()) {
LOG_WARN(Moof, "Incomplete Box (missing flags)");
return Err(NS_ERROR_FAILURE);
}
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
if (!reader->CanReadType<uint32_t>()) {
LOG_WARN(Moof, "Incomplete Box (missing sampleCount)");
return Err(NS_ERROR_FAILURE);
}
uint32_t sampleCount;
MOZ_TRY_VAR(sampleCount, reader->ReadU32());
if (sampleCount == 0) {
LOG_DEBUG(Trun, "Trun with no samples, returning.");
return Ok();
}
uint64_t offset = mTfhd.mBaseDataOffset;
if (flags & 0x01) {
uint32_t tmp;
MOZ_TRY_VAR(tmp, reader->ReadU32());
offset += tmp;
}
uint32_t firstSampleFlags = mTfhd.mDefaultSampleFlags;
if (flags & 0x04) {
MOZ_TRY_VAR(firstSampleFlags, reader->ReadU32());
}
uint64_t decodeTime = *aDecodeTime;
nsTArray<MP4Interval<Microseconds>> timeRanges;
if (!mIndex.SetCapacity(sampleCount, fallible)) {
LOG_ERROR(Moof, "Out of Memory");
return Err(NS_ERROR_FAILURE);
}
for (size_t i = 0; i < sampleCount; i++) {
uint32_t sampleDuration = mTfhd.mDefaultSampleDuration;
if (flags & 0x100) {
MOZ_TRY_VAR(sampleDuration, reader->ReadU32());
}
uint32_t sampleSize = mTfhd.mDefaultSampleSize;
if (flags & 0x200) {
MOZ_TRY_VAR(sampleSize, reader->ReadU32());
}
uint32_t sampleFlags = i ? mTfhd.mDefaultSampleFlags : firstSampleFlags;
if (flags & 0x400) {
MOZ_TRY_VAR(sampleFlags, reader->ReadU32());
}
int32_t ctsOffset = 0;
if (flags & 0x800) {
MOZ_TRY_VAR(ctsOffset, reader->Read32());
}
if (sampleSize) {
Sample sample;
sample.mByteRange = MediaByteRange(offset, offset + sampleSize);
offset += sampleSize;
Microseconds decodeOffset, emptyOffset, startCts, endCts;
MOZ_TRY_VAR(decodeOffset, aMdhd.ToMicroseconds((int64_t)decodeTime -
aEdts.mMediaStart));
MOZ_TRY_VAR(emptyOffset, aMvhd.ToMicroseconds(aEdts.mEmptyOffset));
sample.mDecodeTime = decodeOffset + emptyOffset;
MOZ_TRY_VAR(startCts,
aMdhd.ToMicroseconds((int64_t)decodeTime + ctsOffset -
aEdts.mMediaStart));
MOZ_TRY_VAR(endCts,
aMdhd.ToMicroseconds((int64_t)decodeTime + ctsOffset +
sampleDuration - aEdts.mMediaStart));
sample.mCompositionRange = MP4Interval<Microseconds>(
startCts + emptyOffset, endCts + emptyOffset);
// Sometimes audio streams don't properly mark their samples as keyframes,
// because every audio sample is a keyframe.
sample.mSync = !(sampleFlags & 0x1010000) || aIsAudio;
// FIXME: Make this infallible after bug 968520 is done.
MOZ_ALWAYS_TRUE(mIndex.AppendElement(sample, fallible));
mMdatRange = mMdatRange.Span(sample.mByteRange);
}
decodeTime += sampleDuration;
}
Microseconds roundTime;
MOZ_TRY_VAR(roundTime, aMdhd.ToMicroseconds(sampleCount));
mMaxRoundingError += roundTime;
*aDecodeTime = decodeTime;
LOG_DEBUG(Trun, "Done.");
return Ok();
}
Tkhd::Tkhd(Box& aBox) : mTrackId(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Tkhd, "Parse failed");
}
}
Result<Ok, nsresult> Tkhd::Parse(Box& aBox) {
BoxReader reader(aBox);
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
uint8_t version = flags >> 24;
if (version == 0) {
uint32_t creationTime, modificationTime, reserved, duration;
MOZ_TRY_VAR(creationTime, reader->ReadU32());
MOZ_TRY_VAR(modificationTime, reader->ReadU32());
MOZ_TRY_VAR(mTrackId, reader->ReadU32());
MOZ_TRY_VAR(reserved, reader->ReadU32());
MOZ_TRY_VAR(duration, reader->ReadU32());
NS_ASSERTION(!reserved, "reserved should be 0");
mCreationTime = creationTime;
mModificationTime = modificationTime;
mDuration = duration;
} else if (version == 1) {
uint32_t reserved;
MOZ_TRY_VAR(mCreationTime, reader->ReadU64());
MOZ_TRY_VAR(mModificationTime, reader->ReadU64());
MOZ_TRY_VAR(mTrackId, reader->ReadU32());
MOZ_TRY_VAR(reserved, reader->ReadU32());
NS_ASSERTION(!reserved, "reserved should be 0");
MOZ_TRY_VAR(mDuration, reader->ReadU64());
}
return Ok();
}
Mvhd::Mvhd(Box& aBox)
: mCreationTime(0), mModificationTime(0), mTimescale(0), mDuration(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Mvhd, "Parse failed");
}
}
Result<Ok, nsresult> Mvhd::Parse(Box& aBox) {
BoxReader reader(aBox);
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
uint8_t version = flags >> 24;
if (version == 0) {
uint32_t creationTime, modificationTime, duration;
MOZ_TRY_VAR(creationTime, reader->ReadU32());
MOZ_TRY_VAR(modificationTime, reader->ReadU32());
MOZ_TRY_VAR(mTimescale, reader->ReadU32());
MOZ_TRY_VAR(duration, reader->ReadU32());
mCreationTime = creationTime;
mModificationTime = modificationTime;
mDuration = duration;
} else if (version == 1) {
MOZ_TRY_VAR(mCreationTime, reader->ReadU64());
MOZ_TRY_VAR(mModificationTime, reader->ReadU64());
MOZ_TRY_VAR(mTimescale, reader->ReadU32());
MOZ_TRY_VAR(mDuration, reader->ReadU64());
} else {
return Err(NS_ERROR_FAILURE);
}
return Ok();
}
Mdhd::Mdhd(Box& aBox) : Mvhd(aBox) {}
Trex::Trex(Box& aBox)
: mFlags(0),
mTrackId(0),
mDefaultSampleDescriptionIndex(0),
mDefaultSampleDuration(0),
mDefaultSampleSize(0),
mDefaultSampleFlags(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Trex, "Parse failed");
}
}
Result<Ok, nsresult> Trex::Parse(Box& aBox) {
BoxReader reader(aBox);
MOZ_TRY_VAR(mFlags, reader->ReadU32());
MOZ_TRY_VAR(mTrackId, reader->ReadU32());
MOZ_TRY_VAR(mDefaultSampleDescriptionIndex, reader->ReadU32());
MOZ_TRY_VAR(mDefaultSampleDuration, reader->ReadU32());
MOZ_TRY_VAR(mDefaultSampleSize, reader->ReadU32());
MOZ_TRY_VAR(mDefaultSampleFlags, reader->ReadU32());
return Ok();
}
Tfhd::Tfhd(Box& aBox, Trex& aTrex) : Trex(aTrex), mBaseDataOffset(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Tfhd, "Parse failed");
}
}
Result<Ok, nsresult> Tfhd::Parse(Box& aBox) {
MOZ_ASSERT(aBox.IsType("tfhd"));
MOZ_ASSERT(aBox.Parent()->IsType("traf"));
MOZ_ASSERT(aBox.Parent()->Parent()->IsType("moof"));
BoxReader reader(aBox);
MOZ_TRY_VAR(mFlags, reader->ReadU32());
MOZ_TRY_VAR(mTrackId, reader->ReadU32());
mBaseDataOffset = aBox.Parent()->Parent()->Offset();
if (mFlags & 0x01) {
MOZ_TRY_VAR(mBaseDataOffset, reader->ReadU64());
}
if (mFlags & 0x02) {
MOZ_TRY_VAR(mDefaultSampleDescriptionIndex, reader->ReadU32());
}
if (mFlags & 0x08) {
MOZ_TRY_VAR(mDefaultSampleDuration, reader->ReadU32());
}
if (mFlags & 0x10) {
MOZ_TRY_VAR(mDefaultSampleSize, reader->ReadU32());
}
if (mFlags & 0x20) {
MOZ_TRY_VAR(mDefaultSampleFlags, reader->ReadU32());
}
return Ok();
}
Tfdt::Tfdt(Box& aBox) : mBaseMediaDecodeTime(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Tfdt, "Parse failed");
}
}
Result<Ok, nsresult> Tfdt::Parse(Box& aBox) {
BoxReader reader(aBox);
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
uint8_t version = flags >> 24;
if (version == 0) {
uint32_t tmp;
MOZ_TRY_VAR(tmp, reader->ReadU32());
mBaseMediaDecodeTime = tmp;
} else if (version == 1) {
MOZ_TRY_VAR(mBaseMediaDecodeTime, reader->ReadU64());
}
return Ok();
}
Edts::Edts(Box& aBox) : mMediaStart(0), mEmptyOffset(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Edts, "Parse failed");
}
}
Result<Ok, nsresult> Edts::Parse(Box& aBox) {
Box child = aBox.FirstChild();
if (!child.IsType("elst")) {
return Err(NS_ERROR_FAILURE);
}
BoxReader reader(child);
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
uint8_t version = flags >> 24;
bool emptyEntry = false;
uint32_t entryCount;
MOZ_TRY_VAR(entryCount, reader->ReadU32());
for (uint32_t i = 0; i < entryCount; i++) {
uint64_t segment_duration;
int64_t media_time;
if (version == 1) {
MOZ_TRY_VAR(segment_duration, reader->ReadU64());
MOZ_TRY_VAR(media_time, reader->Read64());
} else {
uint32_t tmp;
MOZ_TRY_VAR(tmp, reader->ReadU32());
segment_duration = tmp;
int32_t tmp2;
MOZ_TRY_VAR(tmp2, reader->Read32());
media_time = tmp2;
}
if (media_time == -1 && i) {
LOG_WARN(Edts, "Multiple empty edit, not handled");
} else if (media_time == -1) {
mEmptyOffset = segment_duration;
emptyEntry = true;
} else if (i > 1 || (i > 0 && !emptyEntry)) {
LOG_WARN(Edts,
"More than one edit entry, not handled. A/V sync will be wrong");
break;
} else {
mMediaStart = media_time;
}
MOZ_TRY(reader->ReadU32()); // media_rate_integer and media_rate_fraction
}
return Ok();
}
Saiz::Saiz(Box& aBox, AtomType aDefaultType)
: mAuxInfoType(aDefaultType), mAuxInfoTypeParameter(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Saiz, "Parse failed");
}
}
Result<Ok, nsresult> Saiz::Parse(Box& aBox) {
BoxReader reader(aBox);
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
if (flags & 1) {
MOZ_TRY_VAR(mAuxInfoType, reader->ReadU32());
MOZ_TRY_VAR(mAuxInfoTypeParameter, reader->ReadU32());
}
uint8_t defaultSampleInfoSize;
MOZ_TRY_VAR(defaultSampleInfoSize, reader->ReadU8());
uint32_t count;
MOZ_TRY_VAR(count, reader->ReadU32());
if (defaultSampleInfoSize) {
if (!mSampleInfoSize.SetLength(count, fallible)) {
LOG_ERROR(Saiz, "OOM");
return Err(NS_ERROR_FAILURE);
}
memset(mSampleInfoSize.Elements(), defaultSampleInfoSize,
mSampleInfoSize.Length());
} else {
if (!reader->ReadArray(mSampleInfoSize, count)) {
LOG_WARN(Saiz, "Incomplete Box (OOM or missing count:%u)", count);
return Err(NS_ERROR_FAILURE);
}
}
return Ok();
}
Saio::Saio(Box& aBox, AtomType aDefaultType)
: mAuxInfoType(aDefaultType), mAuxInfoTypeParameter(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Saio, "Parse failed");
}
}
Result<Ok, nsresult> Saio::Parse(Box& aBox) {
BoxReader reader(aBox);
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
uint8_t version = flags >> 24;
if (flags & 1) {
MOZ_TRY_VAR(mAuxInfoType, reader->ReadU32());
MOZ_TRY_VAR(mAuxInfoTypeParameter, reader->ReadU32());
}
size_t count;
MOZ_TRY_VAR(count, reader->ReadU32());
if (!mOffsets.SetCapacity(count, fallible)) {
LOG_ERROR(Saiz, "OOM");
return Err(NS_ERROR_FAILURE);
}
if (version == 0) {
uint32_t offset;
for (size_t i = 0; i < count; i++) {
MOZ_TRY_VAR(offset, reader->ReadU32());
MOZ_ALWAYS_TRUE(mOffsets.AppendElement(offset, fallible));
}
} else {
uint64_t offset;
for (size_t i = 0; i < count; i++) {
MOZ_TRY_VAR(offset, reader->ReadU64());
MOZ_ALWAYS_TRUE(mOffsets.AppendElement(offset, fallible));
}
}
return Ok();
}
Sbgp::Sbgp(Box& aBox) : mGroupingTypeParam(0) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Sbgp, "Parse failed");
}
}
Result<Ok, nsresult> Sbgp::Parse(Box& aBox) {
BoxReader reader(aBox);
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
const uint8_t version = flags >> 24;
uint32_t type;
MOZ_TRY_VAR(type, reader->ReadU32());
mGroupingType = type;
if (version == 1) {
MOZ_TRY_VAR(mGroupingTypeParam, reader->ReadU32());
}
uint32_t count;
MOZ_TRY_VAR(count, reader->ReadU32());
for (uint32_t i = 0; i < count; i++) {
uint32_t sampleCount;
MOZ_TRY_VAR(sampleCount, reader->ReadU32());
uint32_t groupDescriptionIndex;
MOZ_TRY_VAR(groupDescriptionIndex, reader->ReadU32());
SampleToGroupEntry entry(sampleCount, groupDescriptionIndex);
if (!mEntries.AppendElement(entry, mozilla::fallible)) {
LOG_ERROR(Sbgp, "OOM");
return Err(NS_ERROR_FAILURE);
}
}
return Ok();
}
Sgpd::Sgpd(Box& aBox) {
mValid = Parse(aBox).isOk();
if (!mValid) {
LOG_WARN(Sgpd, "Parse failed");
}
}
Result<Ok, nsresult> Sgpd::Parse(Box& aBox) {
BoxReader reader(aBox);
uint32_t flags;
MOZ_TRY_VAR(flags, reader->ReadU32());
const uint8_t version = flags >> 24;
flags = flags & 0xffffff;
uint32_t type;
MOZ_TRY_VAR(type, reader->ReadU32());
mGroupingType = type;
const uint32_t entrySize = sizeof(uint32_t) + kKeyIdSize;
uint32_t defaultLength = 0;
if (version == 1) {
MOZ_TRY_VAR(defaultLength, reader->ReadU32());
if (defaultLength < entrySize && defaultLength != 0) {
return Err(NS_ERROR_FAILURE);
}
}
uint32_t count;
MOZ_TRY_VAR(count, reader->ReadU32());
for (uint32_t i = 0; i < count; ++i) {
if (version == 1 && defaultLength == 0) {
uint32_t descriptionLength;
MOZ_TRY_VAR(descriptionLength, reader->ReadU32());
if (descriptionLength < entrySize) {
return Err(NS_ERROR_FAILURE);
}
}
CencSampleEncryptionInfoEntry entry;
bool valid = entry.Init(reader).isOk();
if (!valid) {
return Err(NS_ERROR_FAILURE);
}
if (!mEntries.AppendElement(entry, mozilla::fallible)) {
LOG_ERROR(Sgpd, "OOM");
return Err(NS_ERROR_FAILURE);
}
}
return Ok();
}
Result<Ok, nsresult> CencSampleEncryptionInfoEntry::Init(BoxReader& aReader) {
// Skip a reserved byte.
MOZ_TRY(aReader->ReadU8());
uint8_t pattern;
MOZ_TRY_VAR(pattern, aReader->ReadU8());
mCryptByteBlock = pattern >> 4;
mSkipByteBlock = pattern & 0x0f;
uint8_t isEncrypted;
MOZ_TRY_VAR(isEncrypted, aReader->ReadU8());
mIsEncrypted = isEncrypted != 0;
MOZ_TRY_VAR(mIVSize, aReader->ReadU8());
// Read the key id.
if (!mKeyId.SetLength(kKeyIdSize, fallible)) {
LOG_ERROR(CencSampleEncryptionInfoEntry, "OOM");
return Err(NS_ERROR_FAILURE);
}
for (uint32_t i = 0; i < kKeyIdSize; ++i) {
MOZ_TRY_VAR(mKeyId.ElementAt(i), aReader->ReadU8());
}
if (mIsEncrypted) {
if (mIVSize != 8 && mIVSize != 16) {
return Err(NS_ERROR_FAILURE);
}
} else if (mIVSize != 0) {
// Protected content with 0 sized IV indicates a constant IV is present.
// This is used for the cbcs scheme.
uint8_t constantIVSize;
MOZ_TRY_VAR(constantIVSize, aReader->ReadU8());
if (constantIVSize != 8 && constantIVSize != 16) {
LOG_WARN(CencSampleEncryptionInfoEntry,
"Unexpected constantIVSize: %" PRIu8, constantIVSize);
return Err(NS_ERROR_FAILURE);
}
if (!mConsantIV.SetLength(constantIVSize, mozilla::fallible)) {
LOG_ERROR(CencSampleEncryptionInfoEntry, "OOM");
return Err(NS_ERROR_FAILURE);
}
for (uint32_t i = 0; i < constantIVSize; ++i) {
MOZ_TRY_VAR(mConsantIV.ElementAt(i), aReader->ReadU8());
}
}
return Ok();
}
} // namespace mozilla
#undef LOG_DEBUG
#undef LOG_WARN
#undef LOG_ERROR
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