/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* 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 "ContainerParser.h" #include "WebMBufferedParser.h" #include "mozilla/EndianUtils.h" #include "mozilla/ErrorResult.h" #include "mp4_demuxer/MoofParser.h" #include "mozilla/Logging.h" #include "mozilla/Maybe.h" #include "MediaData.h" #ifdef MOZ_FMP4 #include "MP4Stream.h" #include "mp4_demuxer/AtomType.h" #include "mp4_demuxer/ByteReader.h" #endif #include "nsAutoPtr.h" #include "SourceBufferResource.h" #include extern mozilla::LogModule* GetMediaSourceSamplesLog(); #define STRINGIFY(x) #x #define TOSTRING(x) STRINGIFY(x) #define MSE_DEBUG(name, arg, ...) MOZ_LOG(GetMediaSourceSamplesLog(), mozilla::LogLevel::Debug, (TOSTRING(name) "(%p:%s)::%s: " arg, this, mType.get(), __func__, ##__VA_ARGS__)) #define MSE_DEBUGV(name, arg, ...) MOZ_LOG(GetMediaSourceSamplesLog(), mozilla::LogLevel::Verbose, (TOSTRING(name) "(%p:%s)::%s: " arg, this, mType.get(), __func__, ##__VA_ARGS__)) namespace mozilla { ContainerParser::ContainerParser(const nsACString& aType) : mHasInitData(false) , mType(aType) { } ContainerParser::~ContainerParser() = default; MediaResult ContainerParser::IsInitSegmentPresent(MediaByteBuffer* aData) { MSE_DEBUG(ContainerParser, "aLength=%u [%x%x%x%x]", aData->Length(), aData->Length() > 0 ? (*aData)[0] : 0, aData->Length() > 1 ? (*aData)[1] : 0, aData->Length() > 2 ? (*aData)[2] : 0, aData->Length() > 3 ? (*aData)[3] : 0); return NS_ERROR_NOT_AVAILABLE; } MediaResult ContainerParser::IsMediaSegmentPresent(MediaByteBuffer* aData) { MSE_DEBUG(ContainerParser, "aLength=%u [%x%x%x%x]", aData->Length(), aData->Length() > 0 ? (*aData)[0] : 0, aData->Length() > 1 ? (*aData)[1] : 0, aData->Length() > 2 ? (*aData)[2] : 0, aData->Length() > 3 ? (*aData)[3] : 0); return NS_ERROR_NOT_AVAILABLE; } MediaResult ContainerParser::ParseStartAndEndTimestamps(MediaByteBuffer* aData, int64_t& aStart, int64_t& aEnd) { return NS_ERROR_NOT_AVAILABLE; } bool ContainerParser::TimestampsFuzzyEqual(int64_t aLhs, int64_t aRhs) { return llabs(aLhs - aRhs) <= GetRoundingError(); } int64_t ContainerParser::GetRoundingError() { NS_WARNING("Using default ContainerParser::GetRoundingError implementation"); return 0; } bool ContainerParser::HasCompleteInitData() { return mHasInitData && !!mInitData->Length(); } MediaByteBuffer* ContainerParser::InitData() { return mInitData; } MediaByteRange ContainerParser::InitSegmentRange() { return mCompleteInitSegmentRange; } MediaByteRange ContainerParser::MediaHeaderRange() { return mCompleteMediaHeaderRange; } MediaByteRange ContainerParser::MediaSegmentRange() { return mCompleteMediaSegmentRange; } class WebMContainerParser : public ContainerParser { public: explicit WebMContainerParser(const nsACString& aType) : ContainerParser(aType) , mParser(0) , mOffset(0) {} static const unsigned NS_PER_USEC = 1000; static const unsigned USEC_PER_SEC = 1000000; MediaResult IsInitSegmentPresent(MediaByteBuffer* aData) override { ContainerParser::IsInitSegmentPresent(aData); // XXX: This is overly primitive, needs to collect data as it's appended // to the SB and handle, rather than assuming everything is present in a // single aData segment. // 0x1a45dfa3 // EBML // ... // DocType == "webm" // ... // 0x18538067 // Segment (must be "unknown" size or contain a value large // enough to include the Segment Information and Tracks // elements that follow) // 0x1549a966 // -> Segment Info // 0x1654ae6b // -> One or more Tracks // 0x1a45dfa3 // EBML if (aData->Length() < 4) { return NS_ERROR_NOT_AVAILABLE; } if ((*aData)[0] == 0x1a && (*aData)[1] == 0x45 && (*aData)[2] == 0xdf && (*aData)[3] == 0xa3) { return NS_OK; } return MediaResult(NS_ERROR_FAILURE, RESULT_DETAIL("Invalid webm content")); } MediaResult IsMediaSegmentPresent(MediaByteBuffer* aData) override { ContainerParser::IsMediaSegmentPresent(aData); // XXX: This is overly primitive, needs to collect data as it's appended // to the SB and handle, rather than assuming everything is present in a // single aData segment. // 0x1a45dfa3 // EBML // ... // DocType == "webm" // ... // 0x18538067 // Segment (must be "unknown" size) // 0x1549a966 // -> Segment Info // 0x1654ae6b // -> One or more Tracks // 0x1f43b675 // Cluster if (aData->Length() < 4) { return NS_ERROR_NOT_AVAILABLE; } if ((*aData)[0] == 0x1f && (*aData)[1] == 0x43 && (*aData)[2] == 0xb6 && (*aData)[3] == 0x75) { return NS_OK; } // 0x1c53bb6b // Cues if ((*aData)[0] == 0x1c && (*aData)[1] == 0x53 && (*aData)[2] == 0xbb && (*aData)[3] == 0x6b) { return NS_OK; } return MediaResult(NS_ERROR_FAILURE, RESULT_DETAIL("Invalid webm content")); } MediaResult ParseStartAndEndTimestamps(MediaByteBuffer* aData, int64_t& aStart, int64_t& aEnd) override { bool initSegment = NS_SUCCEEDED(IsInitSegmentPresent(aData)); if (mLastMapping && (initSegment || NS_SUCCEEDED(IsMediaSegmentPresent(aData)))) { // The last data contained a complete cluster but we can only detect it // now that a new one is starting. // We use mOffset as end position to ensure that any blocks not reported // by WebMBufferParser are properly skipped. mCompleteMediaSegmentRange = MediaByteRange(mLastMapping.ref().mSyncOffset, mOffset); mLastMapping.reset(); MSE_DEBUG(WebMContainerParser, "New cluster found at start, ending previous one"); return NS_ERROR_NOT_AVAILABLE; } if (initSegment) { mOffset = 0; mParser = WebMBufferedParser(0); mOverlappedMapping.Clear(); mInitData = new MediaByteBuffer(); mResource = new SourceBufferResource(NS_LITERAL_CSTRING("video/webm")); mCompleteMediaHeaderRange = MediaByteRange(); mCompleteMediaSegmentRange = MediaByteRange(); } // XXX if it only adds new mappings, overlapped but not available // (e.g. overlap < 0) frames are "lost" from the reported mappings here. nsTArray mapping; mapping.AppendElements(mOverlappedMapping); mOverlappedMapping.Clear(); ReentrantMonitor dummy("dummy"); mParser.Append(aData->Elements(), aData->Length(), mapping, dummy); if (mResource) { mResource->AppendData(aData); } // XXX This is a bit of a hack. Assume if there are no timecodes // present and it's an init segment that it's _just_ an init segment. // We should be more precise. if (initSegment || !HasCompleteInitData()) { if (mParser.mInitEndOffset > 0) { MOZ_ASSERT(mParser.mInitEndOffset <= mResource->GetLength()); if (!mInitData->SetLength(mParser.mInitEndOffset, fallible)) { // Super unlikely OOM return NS_ERROR_OUT_OF_MEMORY; } mCompleteInitSegmentRange = MediaByteRange(0, mParser.mInitEndOffset); char* buffer = reinterpret_cast(mInitData->Elements()); mResource->ReadFromCache(buffer, 0, mParser.mInitEndOffset); MSE_DEBUG(WebMContainerParser, "Stashed init of %u bytes.", mParser.mInitEndOffset); mResource = nullptr; } else { MSE_DEBUG(WebMContainerParser, "Incomplete init found."); } mHasInitData = true; } mOffset += aData->Length(); if (mapping.IsEmpty()) { return NS_ERROR_NOT_AVAILABLE; } // Calculate media range for first media segment. // Check if we have a cluster finishing in the current data. uint32_t endIdx = mapping.Length() - 1; bool foundNewCluster = false; while (mapping[0].mSyncOffset != mapping[endIdx].mSyncOffset) { endIdx -= 1; foundNewCluster = true; } int32_t completeIdx = endIdx; while (completeIdx >= 0 && mOffset < mapping[completeIdx].mEndOffset) { MSE_DEBUG(WebMContainerParser, "block is incomplete, missing: %lld", mapping[completeIdx].mEndOffset - mOffset); completeIdx -= 1; } // Save parsed blocks for which we do not have all data yet. mOverlappedMapping.AppendElements(mapping.Elements() + completeIdx + 1, mapping.Length() - completeIdx - 1); if (completeIdx < 0) { mLastMapping.reset(); return NS_ERROR_NOT_AVAILABLE; } if (mCompleteMediaHeaderRange.IsEmpty()) { mCompleteMediaHeaderRange = MediaByteRange(mapping[0].mSyncOffset, mapping[0].mEndOffset); } if (foundNewCluster && mOffset >= mapping[endIdx].mEndOffset) { // We now have all information required to delimit a complete cluster. int64_t endOffset = mapping[endIdx+1].mSyncOffset; if (mapping[endIdx+1].mInitOffset > mapping[endIdx].mInitOffset) { // We have a new init segment before this cluster. endOffset = mapping[endIdx+1].mInitOffset; } mCompleteMediaSegmentRange = MediaByteRange(mapping[endIdx].mSyncOffset, endOffset); } else if (mapping[endIdx].mClusterEndOffset >= 0 && mOffset >= mapping[endIdx].mClusterEndOffset) { mCompleteMediaSegmentRange = MediaByteRange(mapping[endIdx].mSyncOffset, mParser.EndSegmentOffset(mapping[endIdx].mClusterEndOffset)); } Maybe previousMapping; if (completeIdx) { previousMapping = Some(mapping[completeIdx - 1]); } else { previousMapping = mLastMapping; } mLastMapping = Some(mapping[completeIdx]); if (!previousMapping && completeIdx + 1u >= mapping.Length()) { // We have no previous nor next block available, // so we can't estimate this block's duration. return NS_ERROR_NOT_AVAILABLE; } uint64_t frameDuration = (completeIdx + 1u < mapping.Length()) ? mapping[completeIdx + 1].mTimecode - mapping[completeIdx].mTimecode : mapping[completeIdx].mTimecode - previousMapping.ref().mTimecode; aStart = mapping[0].mTimecode / NS_PER_USEC; aEnd = (mapping[completeIdx].mTimecode + frameDuration) / NS_PER_USEC; MSE_DEBUG(WebMContainerParser, "[%lld, %lld] [fso=%lld, leo=%lld, l=%u processedIdx=%u fs=%lld]", aStart, aEnd, mapping[0].mSyncOffset, mapping[completeIdx].mEndOffset, mapping.Length(), completeIdx, mCompleteMediaSegmentRange.mEnd); return NS_OK; } int64_t GetRoundingError() override { int64_t error = mParser.GetTimecodeScale() / NS_PER_USEC; return error * 2; } private: WebMBufferedParser mParser; nsTArray mOverlappedMapping; int64_t mOffset; Maybe mLastMapping; }; #ifdef MOZ_FMP4 class MP4ContainerParser : public ContainerParser { public: explicit MP4ContainerParser(const nsACString& aType) : ContainerParser(aType) {} MediaResult IsInitSegmentPresent(MediaByteBuffer* aData) override { ContainerParser::IsInitSegmentPresent(aData); // Each MP4 atom has a chunk size and chunk type. The root chunk in an MP4 // file is the 'ftyp' atom followed by a file type. We just check for a // vaguely valid 'ftyp' atom. if (aData->Length() < 8) { return NS_ERROR_NOT_AVAILABLE; } AtomParser parser(mType, aData); if (!parser.IsValid()) { return MediaResult( NS_ERROR_FAILURE, RESULT_DETAIL("Invalid Top-Level Box:%s", parser.LastInvalidBox())); } return parser.StartWithInitSegment() ? NS_OK : NS_ERROR_NOT_AVAILABLE; } MediaResult IsMediaSegmentPresent(MediaByteBuffer* aData) override { if (aData->Length() < 8) { return NS_ERROR_NOT_AVAILABLE; } AtomParser parser(mType, aData); if (!parser.IsValid()) { return MediaResult( NS_ERROR_FAILURE, RESULT_DETAIL("Invalid Box:%s", parser.LastInvalidBox())); } return parser.StartWithMediaSegment() ? NS_OK : NS_ERROR_NOT_AVAILABLE; } private: class AtomParser { public: AtomParser(const nsACString& aType, const MediaByteBuffer* aData) { const nsCString mType(aType); // for logging macro. mp4_demuxer::ByteReader reader(aData); mp4_demuxer::AtomType initAtom("ftyp"); mp4_demuxer::AtomType mediaAtom("moof"); // Valid top-level boxes defined in ISO/IEC 14496-12 (Table 1) static const mp4_demuxer::AtomType validBoxes[] = { "ftyp", "moov", // init segment "pdin", "free", "sidx", // optional prior moov box "styp", "moof", "mdat", // media segment "mfra", "skip", "meta", "meco", "ssix", "prft", // others. "pssh", // optional with encrypted EME, though ignored. "emsg", // ISO23009-1:2014 Section 5.10.3.3 "bloc", "uuid" // boxes accepted by chrome. }; while (reader.Remaining() >= 8) { uint64_t size = reader.ReadU32(); const uint8_t* typec = reader.Peek(4); mp4_demuxer::AtomType type(reader.ReadU32()); MSE_DEBUGV(AtomParser ,"Checking atom:'%c%c%c%c' @ %u", typec[0], typec[1], typec[2], typec[3], (uint32_t)reader.Offset() - 8); if (std::find(std::begin(validBoxes), std::end(validBoxes), type) == std::end(validBoxes)) { // No valid box found, no point continuing. mLastInvalidBox[0] = typec[0]; mLastInvalidBox[1] = typec[1]; mLastInvalidBox[2] = typec[2]; mLastInvalidBox[3] = typec[3]; mLastInvalidBox[4] = '\0'; mValid = false; break; } if (mInitOffset.isNothing() && mp4_demuxer::AtomType(type) == initAtom) { mInitOffset = Some(reader.Offset()); } if (mMediaOffset.isNothing() && mp4_demuxer::AtomType(type) == mediaAtom) { mMediaOffset = Some(reader.Offset()); } if (mInitOffset.isSome() && mMediaOffset.isSome()) { // We have everything we need. break; } if (size == 1) { // 64 bits size. if (!reader.CanReadType()) { break; } size = reader.ReadU64(); } else if (size == 0) { // Atom extends to the end of the buffer, it can't have what we're // looking for. break; } if (reader.Remaining() < size - 8) { // Incomplete atom. break; } reader.Read(size - 8); } } bool StartWithInitSegment() const { return mInitOffset.isSome() && (mMediaOffset.isNothing() || mInitOffset.ref() < mMediaOffset.ref()); } bool StartWithMediaSegment() const { return mMediaOffset.isSome() && (mInitOffset.isNothing() || mMediaOffset.ref() < mInitOffset.ref()); } bool IsValid() const { return mValid; } const char* LastInvalidBox() const { return mLastInvalidBox; } private: Maybe mInitOffset; Maybe mMediaOffset; bool mValid = true; char mLastInvalidBox[5]; }; public: MediaResult ParseStartAndEndTimestamps(MediaByteBuffer* aData, int64_t& aStart, int64_t& aEnd) override { bool initSegment = NS_SUCCEEDED(IsInitSegmentPresent(aData)); if (initSegment) { mResource = new SourceBufferResource(NS_LITERAL_CSTRING("video/mp4")); mStream = new MP4Stream(mResource); // We use a timestampOffset of 0 for ContainerParser, and require // consumers of ParseStartAndEndTimestamps to add their timestamp offset // manually. This allows the ContainerParser to be shared across different // timestampOffsets. mParser = new mp4_demuxer::MoofParser(mStream, 0, /* aIsAudio = */ false); mInitData = new MediaByteBuffer(); } else if (!mStream || !mParser) { return NS_ERROR_NOT_AVAILABLE; } mResource->AppendData(aData); MediaByteRangeSet byteRanges; byteRanges += MediaByteRange(int64_t(mParser->mOffset), mResource->GetLength()); mParser->RebuildFragmentedIndex(byteRanges); if (initSegment || !HasCompleteInitData()) { MediaByteRange& range = mParser->mInitRange; if (range.Length()) { mCompleteInitSegmentRange = range; if (!mInitData->SetLength(range.Length(), fallible)) { // Super unlikely OOM return NS_ERROR_OUT_OF_MEMORY; } char* buffer = reinterpret_cast(mInitData->Elements()); mResource->ReadFromCache(buffer, range.mStart, range.Length()); MSE_DEBUG(MP4ContainerParser ,"Stashed init of %u bytes.", range.Length()); } else { MSE_DEBUG(MP4ContainerParser, "Incomplete init found."); } mHasInitData = true; } mp4_demuxer::Interval compositionRange = mParser->GetCompositionRange(byteRanges); mCompleteMediaHeaderRange = mParser->FirstCompleteMediaHeader(); mCompleteMediaSegmentRange = mParser->FirstCompleteMediaSegment(); ErrorResult rv; if (HasCompleteInitData()) { mResource->EvictData(mParser->mOffset, mParser->mOffset, rv); } if (NS_WARN_IF(rv.Failed())) { rv.SuppressException(); return NS_ERROR_OUT_OF_MEMORY; } if (compositionRange.IsNull()) { return NS_ERROR_NOT_AVAILABLE; } aStart = compositionRange.start; aEnd = compositionRange.end; MSE_DEBUG(MP4ContainerParser, "[%lld, %lld]", aStart, aEnd); return NS_OK; } // Gaps of up to 35ms (marginally longer than a single frame at 30fps) are considered // to be sequential frames. int64_t GetRoundingError() override { return 35000; } private: RefPtr mStream; nsAutoPtr mParser; }; #endif // MOZ_FMP4 #ifdef MOZ_FMP4 class ADTSContainerParser : public ContainerParser { public: explicit ADTSContainerParser(const nsACString& aType) : ContainerParser(aType) {} typedef struct { size_t header_length; // Length of just the initialization data. size_t frame_length; // Includes header_length; uint8_t aac_frames; // Number of AAC frames in the ADTS frame. bool have_crc; } Header; /// Helper to parse the ADTS header, returning data we care about. /// Returns true if the header is parsed successfully. /// Returns false if the header is invalid or incomplete, /// without modifying the passed-in Header object. bool Parse(MediaByteBuffer* aData, Header& header) { MOZ_ASSERT(aData); // ADTS initialization segments are just the packet header. if (aData->Length() < 7) { MSE_DEBUG(ADTSContainerParser, "buffer too short for header."); return false; } // Check 0xfffx sync word plus layer 0. if (((*aData)[0] != 0xff) || (((*aData)[1] & 0xf6) != 0xf0)) { MSE_DEBUG(ADTSContainerParser, "no syncword."); return false; } bool have_crc = !((*aData)[1] & 0x01); if (have_crc && aData->Length() < 9) { MSE_DEBUG(ADTSContainerParser, "buffer too short for header with crc."); return false; } uint8_t frequency_index = ((*aData)[2] & 0x3c) >> 2; MOZ_ASSERT(frequency_index < 16); if (frequency_index == 15) { MSE_DEBUG(ADTSContainerParser, "explicit frequency disallowed."); return false; } size_t header_length = have_crc ? 9 : 7; size_t data_length = (((*aData)[3] & 0x03) << 11) || (((*aData)[4] & 0xff) << 3) || (((*aData)[5] & 0xe0) >> 5); uint8_t frames = ((*aData)[6] & 0x03) + 1; MOZ_ASSERT(frames > 0); MOZ_ASSERT(frames < 4); // Return successfully parsed data. header.header_length = header_length; header.frame_length = header_length + data_length; header.aac_frames = frames; header.have_crc = have_crc; return true; } MediaResult IsInitSegmentPresent(MediaByteBuffer* aData) override { // Call superclass for logging. ContainerParser::IsInitSegmentPresent(aData); Header header; if (!Parse(aData, header)) { return NS_ERROR_NOT_AVAILABLE; } MSE_DEBUGV(ADTSContainerParser, "%llu byte frame %d aac frames%s", (unsigned long long)header.frame_length, (int)header.aac_frames, header.have_crc ? " crc" : ""); return NS_OK; } MediaResult IsMediaSegmentPresent(MediaByteBuffer* aData) override { // Call superclass for logging. ContainerParser::IsMediaSegmentPresent(aData); // Make sure we have a header so we know how long the frame is. // NB this assumes the media segment buffer starts with an // initialization segment. Since every frame has an ADTS header // this is a normal place to divide packets, but we can re-parse // mInitData if we need to handle separate media segments. Header header; if (!Parse(aData, header)) { return NS_ERROR_NOT_AVAILABLE; } // We're supposed to return true as long as aData contains the // start of a media segment, whether or not it's complete. So // return true if we have any data beyond the header. if (aData->Length() <= header.header_length) { return NS_ERROR_NOT_AVAILABLE; } // We should have at least a partial frame. return NS_OK; } MediaResult ParseStartAndEndTimestamps(MediaByteBuffer* aData, int64_t& aStart, int64_t& aEnd) override { // ADTS header. Header header; if (!Parse(aData, header)) { return NS_ERROR_NOT_AVAILABLE; } mHasInitData = true; mCompleteInitSegmentRange = MediaByteRange(0, int64_t(header.header_length)); // Cache raw header in case the caller wants a copy. mInitData = new MediaByteBuffer(header.header_length); mInitData->AppendElements(aData->Elements(), header.header_length); // Check that we have enough data for the frame body. if (aData->Length() < header.frame_length) { MSE_DEBUGV(ADTSContainerParser, "Not enough data for %llu byte frame" " in %llu byte buffer.", (unsigned long long)header.frame_length, (unsigned long long)(aData->Length())); return NS_ERROR_NOT_AVAILABLE; } mCompleteMediaSegmentRange = MediaByteRange(header.header_length, header.frame_length); // The ADTS MediaSource Byte Stream Format document doesn't // define media header. Just treat it the same as the whole // media segment. mCompleteMediaHeaderRange = mCompleteMediaSegmentRange; MSE_DEBUG(ADTSContainerParser, "[%lld, %lld]", aStart, aEnd); // We don't update timestamps, regardless. return NS_ERROR_NOT_AVAILABLE; } // Audio shouldn't have gaps. // Especially when we generate the timestamps ourselves. int64_t GetRoundingError() override { return 0; } }; #endif // MOZ_FMP4 /*static*/ ContainerParser* ContainerParser::CreateForMIMEType(const nsACString& aType) { if (aType.LowerCaseEqualsLiteral("video/webm") || aType.LowerCaseEqualsLiteral("audio/webm")) { return new WebMContainerParser(aType); } #ifdef MOZ_FMP4 if (aType.LowerCaseEqualsLiteral("video/mp4") || aType.LowerCaseEqualsLiteral("audio/mp4")) { return new MP4ContainerParser(aType); } if (aType.LowerCaseEqualsLiteral("audio/aac")) { return new ADTSContainerParser(aType); } #endif return new ContainerParser(aType); } #undef MSE_DEBUG #undef MSE_DEBUGV } // namespace mozilla