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-rw-r--r--dom/media/mediasource/ContainerParser.cpp716
1 files changed, 716 insertions, 0 deletions
diff --git a/dom/media/mediasource/ContainerParser.cpp b/dom/media/mediasource/ContainerParser.cpp
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+++ b/dom/media/mediasource/ContainerParser.cpp
@@ -0,0 +1,716 @@
+/* -*- 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 <algorithm>
+
+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<WebMTimeDataOffset> 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<char*>(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<WebMTimeDataOffset> 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<WebMTimeDataOffset> mOverlappedMapping;
+ int64_t mOffset;
+ Maybe<WebMTimeDataOffset> 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<uint64_t>()) {
+ 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<size_t> mInitOffset;
+ Maybe<size_t> 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<char*>(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<mp4_demuxer::Microseconds> 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<MP4Stream> mStream;
+ nsAutoPtr<mp4_demuxer::MoofParser> 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