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/* -*- 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
#include "ContainerParser.h"
#include <algorithm>
#include "AtomType.h"
#include "BufferReader.h"
#include "ByteStream.h"
#include "MP4Interval.h"
#include "MediaData.h"
#include "MoofParser.h"
#include "SampleIterator.h"
#include "SourceBufferResource.h"
#include "WebMBufferedParser.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Logging.h"
#include "mozilla/Maybe.h"
#include "mozilla/Try.h"
#include "nsMimeTypes.h"
extern mozilla::LogModule* GetMediaSourceSamplesLog();
#define MSE_DEBUG(arg, ...) \
DDMOZ_LOG(GetMediaSourceSamplesLog(), mozilla::LogLevel::Debug, \
"(%s)::%s: " arg, mType.OriginalString().Data(), __func__, \
##__VA_ARGS__)
#define MSE_DEBUGV(arg, ...) \
DDMOZ_LOG(GetMediaSourceSamplesLog(), mozilla::LogLevel::Verbose, \
"(%s)::%s: " arg, mType.OriginalString().Data(), __func__, \
##__VA_ARGS__)
#define MSE_DEBUGVEX(_this, arg, ...) \
DDMOZ_LOGEX(_this, GetMediaSourceSamplesLog(), mozilla::LogLevel::Verbose, \
"(%s)::%s: " arg, mType.OriginalString().Data(), __func__, \
##__VA_ARGS__)
namespace mozilla {
ContainerParser::ContainerParser(const MediaContainerType& aType)
: mHasInitData(false), mTotalParsed(0), mGlobalOffset(0), mType(aType) {}
ContainerParser::~ContainerParser() = default;
MediaResult ContainerParser::IsInitSegmentPresent(const MediaSpan& aData) {
MSE_DEBUG(
"aLength=%zu [%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(const MediaSpan& aData) {
MSE_DEBUG(
"aLength=%zu [%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(const MediaSpan& aData,
media::TimeUnit& aStart,
media::TimeUnit& 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;
}
DDLoggedTypeDeclNameAndBase(WebMContainerParser, ContainerParser);
class WebMContainerParser
: public ContainerParser,
public DecoderDoctorLifeLogger<WebMContainerParser> {
public:
explicit WebMContainerParser(const MediaContainerType& aType)
: ContainerParser(aType), mParser(0), mOffset(0) {}
static const unsigned NS_PER_USEC = 1000;
MediaResult IsInitSegmentPresent(const MediaSpan& aData) override {
ContainerParser::IsInitSegmentPresent(aData);
if (aData.Length() < 4) {
return NS_ERROR_NOT_AVAILABLE;
}
WebMBufferedParser parser(0);
nsTArray<WebMTimeDataOffset> mapping;
if (auto result = parser.Append(aData.Elements(), aData.Length(), mapping);
NS_FAILED(result)) {
return result;
}
return parser.mInitEndOffset > 0 ? NS_OK : NS_ERROR_NOT_AVAILABLE;
}
MediaResult IsMediaSegmentPresent(const MediaSpan& aData) override {
ContainerParser::IsMediaSegmentPresent(aData);
if (aData.Length() < 4) {
return NS_ERROR_NOT_AVAILABLE;
}
WebMBufferedParser parser(0);
nsTArray<WebMTimeDataOffset> mapping;
parser.AppendMediaSegmentOnly();
if (auto result = parser.Append(aData.Elements(), aData.Length(), mapping);
NS_FAILED(result)) {
return result;
}
return parser.GetClusterOffset() >= 0 ? NS_OK : NS_ERROR_NOT_AVAILABLE;
}
MediaResult ParseStartAndEndTimestamps(const MediaSpan& aData,
media::TimeUnit& aStart,
media::TimeUnit& 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) +
mGlobalOffset;
mLastMapping.reset();
MSE_DEBUG("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();
DDLINKCHILD("resource", mResource.get());
mCompleteInitSegmentRange = MediaByteRange();
mCompleteMediaHeaderRange = MediaByteRange();
mCompleteMediaSegmentRange = MediaByteRange();
mGlobalOffset = mTotalParsed;
}
// 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();
if (auto result = mParser.Append(aData.Elements(), aData.Length(), mapping);
NS_FAILED(result)) {
return result;
}
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_DIAGNOSTIC_ASSERT(mInitData && mResource &&
mParser.mInitEndOffset <=
mResource->GetCachedDataEnd(0));
if (!mInitData->SetLength(mParser.mInitEndOffset, fallible)) {
// Super unlikely OOM
return NS_ERROR_OUT_OF_MEMORY;
}
mCompleteInitSegmentRange =
MediaByteRange(0, mParser.mInitEndOffset) + mGlobalOffset;
char* buffer = reinterpret_cast<char*>(mInitData->Elements());
mResource->ReadFromCache(buffer, 0, mParser.mInitEndOffset);
MSE_DEBUG("Stashed init of %" PRId64 " bytes.", mParser.mInitEndOffset);
mResource = nullptr;
} else {
MSE_DEBUG("Incomplete init found.");
}
mHasInitData = true;
}
mOffset += aData.Length();
mTotalParsed += 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("block is incomplete, missing: %" PRId64,
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) +
mGlobalOffset;
}
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) +
mGlobalOffset;
} else if (mapping[endIdx].mClusterEndOffset >= 0 &&
mOffset >= mapping[endIdx].mClusterEndOffset) {
mCompleteMediaSegmentRange =
MediaByteRange(
mapping[endIdx].mSyncOffset,
mParser.EndSegmentOffset(mapping[endIdx].mClusterEndOffset)) +
mGlobalOffset;
}
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 = media::TimeUnit::FromNanoseconds(
AssertedCast<int64_t>(mapping[0].mTimecode));
aEnd = media::TimeUnit::FromNanoseconds(
AssertedCast<int64_t>(mapping[completeIdx].mTimecode + frameDuration));
MSE_DEBUG("[%" PRId64 ", %" PRId64 "] [fso=%" PRId64 ", leo=%" PRId64
", l=%zu processedIdx=%u fs=%" PRId64 "]",
aStart.ToMicroseconds(), aEnd.ToMicroseconds(),
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;
};
DDLoggedTypeDeclNameAndBase(MP4Stream, ByteStream);
class MP4Stream : public ByteStream, public DecoderDoctorLifeLogger<MP4Stream> {
public:
explicit MP4Stream(SourceBufferResource* aResource);
virtual ~MP4Stream();
nsresult ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
size_t* aBytesRead) override;
nsresult CachedReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
size_t* aBytesRead) override;
bool Length(int64_t* aSize) override;
const uint8_t* GetContiguousAccess(int64_t aOffset, size_t aSize) override;
private:
RefPtr<SourceBufferResource> mResource;
};
MP4Stream::MP4Stream(SourceBufferResource* aResource) : mResource(aResource) {
MOZ_COUNT_CTOR(MP4Stream);
MOZ_ASSERT(aResource);
DDLINKCHILD("resource", aResource);
}
MP4Stream::~MP4Stream() { MOZ_COUNT_DTOR(MP4Stream); }
nsresult MP4Stream::ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
size_t* aBytesRead) {
return CachedReadAt(aOffset, aBuffer, aCount, aBytesRead);
}
nsresult MP4Stream::CachedReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
size_t* aBytesRead) {
nsresult rv = mResource->ReadFromCache(reinterpret_cast<char*>(aBuffer),
aOffset, aCount);
if (NS_FAILED(rv)) {
*aBytesRead = 0;
return rv;
}
*aBytesRead = aCount;
return rv;
}
const uint8_t* MP4Stream::GetContiguousAccess(int64_t aOffset, size_t aSize) {
return mResource->GetContiguousAccess(aOffset, aSize);
}
bool MP4Stream::Length(int64_t* aSize) {
if (mResource->GetLength() < 0) return false;
*aSize = mResource->GetLength();
return true;
}
DDLoggedTypeDeclNameAndBase(MP4ContainerParser, ContainerParser);
class MP4ContainerParser : public ContainerParser,
public DecoderDoctorLifeLogger<MP4ContainerParser> {
public:
explicit MP4ContainerParser(const MediaContainerType& aType)
: ContainerParser(aType) {}
MediaResult IsInitSegmentPresent(const MediaSpan& 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(*this, aData, AtomParser::StopAt::eInitSegment);
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(const MediaSpan& aData) override {
if (aData.Length() < 8) {
return NS_ERROR_NOT_AVAILABLE;
}
AtomParser parser(*this, aData, AtomParser::StopAt::eMediaSegment);
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:
enum class StopAt { eInitSegment, eMediaSegment, eEnd };
AtomParser(const MP4ContainerParser& aParser, const MediaSpan& aData,
StopAt aStop = StopAt::eEnd) {
mValid = Init(aParser, aData, aStop).isOk();
}
Result<Ok, nsresult> Init(const MP4ContainerParser& aParser,
const MediaSpan& aData, StopAt aStop) {
const MediaContainerType mType(
aParser.ContainerType()); // for logging macro.
BufferReader reader(aData);
AtomType initAtom("moov");
AtomType mediaAtom("moof");
AtomType dataAtom("mdat");
// Valid top-level boxes defined in ISO/IEC 14496-12 (Table 1)
static const 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 = MOZ_TRY(reader.ReadU32());
const uint8_t* typec = reader.Peek(4);
AtomType type(MOZ_TRY(reader.ReadU32()));
// We've seen fourcc not being ASCII in the wild. In this rare case,
// print hex values instead of the ascii representation.
if (isprint(typec[0]) && isprint(typec[1]) && isprint(typec[2]) &&
isprint(typec[3])) {
MSE_DEBUGVEX(&aParser, "Checking atom:'%c%c%c%c' @ %u", typec[0],
typec[1], typec[2], typec[3],
(uint32_t)reader.Offset() - 8);
} else {
MSE_DEBUGVEX(&aParser,
"Checking atom (not ASCII):'0x%02x%02x%02x%02x' @ %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';
return Err(NS_ERROR_FAILURE);
}
if (mInitOffset.isNothing() && AtomType(type) == initAtom) {
mInitOffset = Some(reader.Offset());
}
if (mMediaOffset.isNothing() && AtomType(type) == mediaAtom) {
mMediaOffset = Some(reader.Offset());
}
if (mDataOffset.isNothing() && AtomType(type) == dataAtom) {
mDataOffset = Some(reader.Offset());
}
if (size == 1) {
// 64 bits size.
size = MOZ_TRY(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);
if (aStop == StopAt::eInitSegment && (mInitOffset || mMediaOffset)) {
// When we're looking for an init segment, if we encountered a media
// segment, it we will need to be processed first. So we can stop
// right away if we have found a media segment.
break;
}
if (aStop == StopAt::eMediaSegment &&
(mInitOffset || (mMediaOffset && mDataOffset))) {
// When we're looking for a media segment, if we encountered an init
// segment, it we will need to be processed first. So we can stop
// right away if we have found an init segment.
break;
}
}
return Ok();
}
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;
Maybe<size_t> mDataOffset;
bool mValid;
char mLastInvalidBox[5];
};
public:
MediaResult ParseStartAndEndTimestamps(const MediaSpan& aData,
media::TimeUnit& aStart,
media::TimeUnit& aEnd) override {
bool initSegment = NS_SUCCEEDED(IsInitSegmentPresent(aData));
if (initSegment) {
mResource = new SourceBufferResource();
DDLINKCHILD("resource", mResource.get());
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 = MakeUnique<MoofParser>(mStream, AsVariant(ParseAllTracks{}),
/* aIsAudio = */ false);
DDLINKCHILD("parser", mParser.get());
mInitData = new MediaByteBuffer();
mCompleteInitSegmentRange = MediaByteRange();
mCompleteMediaHeaderRange = MediaByteRange();
mCompleteMediaSegmentRange = MediaByteRange();
mGlobalOffset = mTotalParsed;
} else if (!mStream || !mParser) {
mTotalParsed += aData.Length();
return NS_ERROR_NOT_AVAILABLE;
}
MOZ_DIAGNOSTIC_ASSERT(mResource && mParser && mInitData,
"Should have received an init segment first");
mResource->AppendData(aData);
MediaByteRangeSet byteRanges;
byteRanges += MediaByteRange(int64_t(mParser->mOffset),
mResource->GetCachedDataEnd(mParser->mOffset));
mParser->RebuildFragmentedIndex(byteRanges);
if (initSegment || !HasCompleteInitData()) {
MediaByteRange& range = mParser->mInitRange;
if (range.Length()) {
mCompleteInitSegmentRange = range + mGlobalOffset;
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("Stashed init of %" PRIu64 " bytes.", range.Length());
} else {
MSE_DEBUG("Incomplete init found.");
}
mHasInitData = true;
}
mTotalParsed += aData.Length();
MP4Interval<media::TimeUnit> compositionRange =
mParser->GetCompositionRange(byteRanges);
mCompleteMediaHeaderRange =
mParser->FirstCompleteMediaHeader() + mGlobalOffset;
mCompleteMediaSegmentRange =
mParser->FirstCompleteMediaSegment() + mGlobalOffset;
if (HasCompleteInitData()) {
mResource->EvictData(mParser->mOffset, mParser->mOffset);
}
if (compositionRange.IsNull()) {
return NS_ERROR_NOT_AVAILABLE;
}
aStart = compositionRange.start;
aEnd = compositionRange.end;
MSE_DEBUG("[%" PRId64 ", %" PRId64 "]", aStart.ToMicroseconds(),
aEnd.ToMicroseconds());
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;
UniquePtr<MoofParser> mParser;
};
DDLoggedTypeDeclNameAndBase(ADTSContainerParser, ContainerParser);
class ADTSContainerParser
: public ContainerParser,
public DecoderDoctorLifeLogger<ADTSContainerParser> {
public:
explicit ADTSContainerParser(const MediaContainerType& 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(const MediaSpan& aData, Header& header) {
// ADTS initialization segments are just the packet header.
if (aData.Length() < 7) {
MSE_DEBUG("buffer too short for header.");
return false;
}
// Check 0xfffx sync word plus layer 0.
if ((aData[0] != 0xff) || ((aData[1] & 0xf6) != 0xf0)) {
MSE_DEBUG("no syncword.");
return false;
}
bool have_crc = !(aData[1] & 0x01);
if (have_crc && aData.Length() < 9) {
MSE_DEBUG("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("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(const MediaSpan& aData) override {
// Call superclass for logging.
ContainerParser::IsInitSegmentPresent(aData);
Header header;
if (!Parse(aData, header)) {
return NS_ERROR_NOT_AVAILABLE;
}
MSE_DEBUGV("%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(const MediaSpan& 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(const MediaSpan& aData,
media::TimeUnit& aStart,
media::TimeUnit& 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(
"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("[%" PRId64 ", %" PRId64 "]", aStart.ToMicroseconds(),
aEnd.ToMicroseconds());
// 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; }
};
/*static*/
UniquePtr<ContainerParser> ContainerParser::CreateForMIMEType(
const MediaContainerType& aType) {
if (aType.Type() == MEDIAMIMETYPE(VIDEO_WEBM) ||
aType.Type() == MEDIAMIMETYPE(AUDIO_WEBM)) {
return MakeUnique<WebMContainerParser>(aType);
}
if (aType.Type() == MEDIAMIMETYPE(VIDEO_MP4) ||
aType.Type() == MEDIAMIMETYPE(AUDIO_MP4)) {
return MakeUnique<MP4ContainerParser>(aType);
}
if (aType.Type() == MEDIAMIMETYPE("audio/aac")) {
return MakeUnique<ADTSContainerParser>(aType);
}
return MakeUnique<ContainerParser>(aType);
}
#undef MSE_DEBUG
#undef MSE_DEBUGV
#undef MSE_DEBUGVEX
} // namespace mozilla