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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 */
#if !defined(MediaFormatReader_h_)
# define MediaFormatReader_h_
# include "FrameStatistics.h"
# include "MediaDataDemuxer.h"
# include "MediaEventSource.h"
# include "MediaMetadataManager.h"
# include "MediaPromiseDefs.h"
# include "PlatformDecoderModule.h"
# include "SeekTarget.h"
# include "mozilla/Atomics.h"
# include "mozilla/Maybe.h"
# include "mozilla/MozPromise.h"
# include "mozilla/Mutex.h"
# include "mozilla/StateMirroring.h"
# include "mozilla/StaticPrefs_media.h"
# include "mozilla/TaskQueue.h"
# include "mozilla/ThreadSafeWeakPtr.h"
# include "mozilla/dom/MediaDebugInfoBinding.h"
namespace mozilla {
class CDMProxy;
class GMPCrashHelper;
class MediaResource;
class VideoFrameContainer;
struct WaitForDataRejectValue {
enum Reason { SHUTDOWN, CANCELED };
WaitForDataRejectValue(MediaData::Type aType, Reason aReason)
: mType(aType), mReason(aReason) {}
MediaData::Type mType;
Reason mReason;
struct SeekRejectValue {
MOZ_IMPLICIT SeekRejectValue(const MediaResult& aError)
: mType(MediaData::Type::NULL_DATA), mError(aError) {}
MOZ_IMPLICIT SeekRejectValue(nsresult aResult)
: mType(MediaData::Type::NULL_DATA), mError(aResult) {}
SeekRejectValue(MediaData::Type aType, const MediaResult& aError)
: mType(aType), mError(aError) {}
MediaData::Type mType;
MediaResult mError;
struct MetadataHolder {
UniquePtr<MediaInfo> mInfo;
UniquePtr<MetadataTags> mTags;
using MediaDecoderOwnerID = void*;
struct MOZ_STACK_CLASS MediaFormatReaderInit {
MediaResource* mResource = nullptr;
VideoFrameContainer* mVideoFrameContainer = nullptr;
FrameStatistics* mFrameStats = nullptr;
already_AddRefed<layers::KnowsCompositor> mKnowsCompositor;
already_AddRefed<GMPCrashHelper> mCrashHelper;
// Used in bug 1393399 for temporary telemetry.
MediaDecoderOwnerID mMediaDecoderOwnerID = nullptr;
Maybe<TrackingId> mTrackingId;
class MediaFormatReader final
: public SupportsThreadSafeWeakPtr<MediaFormatReader>,
public DecoderDoctorLifeLogger<MediaFormatReader> {
static const bool IsExclusive = true;
using TrackType = TrackInfo::TrackType;
using NotifyDataArrivedPromise = MozPromise<bool, MediaResult, IsExclusive>;
using TrackSet = EnumSet<TrackInfo::TrackType>;
using MetadataPromise = MozPromise<MetadataHolder, MediaResult, IsExclusive>;
template <typename Type>
using DataPromise = MozPromise<RefPtr<Type>, MediaResult, IsExclusive>;
using AudioDataPromise = DataPromise<AudioData>;
using VideoDataPromise = DataPromise<VideoData>;
using SeekPromise = MozPromise<media::TimeUnit, SeekRejectValue, IsExclusive>;
// Note that, conceptually, WaitForData makes sense in a non-exclusive sense.
// But in the current architecture it's only ever used exclusively (by MDSM),
// so we mark it that way to verify our assumptions. If you have a use-case
// for multiple WaitForData consumers, feel free to flip the exclusivity here.
using WaitForDataPromise =
MozPromise<MediaData::Type, WaitForDataRejectValue, IsExclusive>;
MediaFormatReader(MediaFormatReaderInit& aInit, MediaDataDemuxer* aDemuxer);
virtual ~MediaFormatReader();
// Initializes the reader, returns NS_OK on success, or NS_ERROR_FAILURE
// on failure.
nsresult Init();
size_t SizeOfVideoQueueInFrames();
size_t SizeOfAudioQueueInFrames();
// Requests one video sample from the reader.
RefPtr<VideoDataPromise> RequestVideoData(
const media::TimeUnit& aTimeThreshold,
bool aRequestNextVideoKeyFrame = false);
// Requests one audio sample from the reader.
// The decode should be performed asynchronously, and the promise should
// be resolved when it is complete.
RefPtr<AudioDataPromise> RequestAudioData();
// The default implementation of AsyncReadMetadata is implemented in terms of
// synchronous ReadMetadata() calls. Implementations may also
// override AsyncReadMetadata to create a more proper async implementation.
RefPtr<MetadataPromise> AsyncReadMetadata();
// Fills aInfo with the latest cached data required to present the media,
// ReadUpdatedMetadata will always be called once ReadMetadata has succeeded.
void ReadUpdatedMetadata(MediaInfo* aInfo);
RefPtr<SeekPromise> Seek(const SeekTarget& aTarget);
// Called once new data has been cached by the MediaResource.
// mBuffered should be recalculated and updated accordingly.
void NotifyDataArrived();
// Update ID for the external playback engine. Currently it's only used on
// Windows when the media engine playback is enabled.
void UpdateMediaEngineId(uint64_t aMediaEngineId);
// Recomputes mBuffered.
void UpdateBuffered();
// Called by MDSM in dormant state to release resources allocated by this
// reader. The reader can resume decoding by calling Seek() to a specific
// position.
void ReleaseResources();
bool OnTaskQueue() const { return OwnerThread()->IsCurrentThreadIn(); }
// Resets all state related to decoding, emptying all buffers etc.
// Cancels all pending Request*Data() request callbacks, rejects any
// outstanding seek promises, and flushes the decode pipeline. The
// decoder must not call any of the callbacks for outstanding
// Request*Data() calls after this is called. Calls to Request*Data()
// made after this should be processed as usual.
// Normally this call preceedes a Seek() call, or shutdown.
// aParam is a set of TrackInfo::TrackType enums specifying which
// queues need to be reset, defaulting to both audio and video tracks.
nsresult ResetDecode(const TrackSet& aTracks);
// Destroys the decoding state. The reader cannot be made usable again.
// This is different from ReleaseMediaResources() as it is irreversable,
// whereas ReleaseMediaResources() is. Must be called on the decode
// thread.
RefPtr<ShutdownPromise> Shutdown();
// Returns true if this decoder reader uses hardware accelerated video
// decoding.
bool VideoIsHardwareAccelerated() const;
// By default, the state machine polls the reader once per second when it's
// in buffering mode. Some readers support a promise-based mechanism by which
// they notify the state machine when the data arrives.
bool IsWaitForDataSupported() const { return true; }
RefPtr<WaitForDataPromise> WaitForData(MediaData::Type aType);
// The MediaDecoderStateMachine uses various heuristics that assume that
// raw media data is arriving sequentially from a network channel. This
// makes sense in the <video src="foo"> case, but not for more advanced use
// cases like MSE.
bool UseBufferingHeuristics() const { return mTrackDemuxersMayBlock; }
RefPtr<SetCDMPromise> SetCDMProxy(CDMProxy* aProxy);
// Requests that the MediaFormatReader populates aInfo with debug information.
// This may be done asynchronously, and aInfo should *not* be accessed by the
// caller until the returned promise is resolved or rejected.
RefPtr<GenericPromise> RequestDebugInfo(
dom::MediaFormatReaderDebugInfo& aInfo);
Maybe<nsCString> GetAudioProcessPerCodec();
// Switch the video decoder to NullDecoderModule. It might takes effective
// since a few samples later depends on how much demuxed samples are already
// queued in the original video decoder.
void SetVideoNullDecode(bool aIsNullDecode);
void UpdateCompositor(already_AddRefed<layers::KnowsCompositor>);
void UpdateDuration(const media::TimeUnit& aDuration) {
AbstractCanonical<media::TimeIntervals>* CanonicalBuffered() {
return &mBuffered;
TaskQueue* OwnerThread() const { return mTaskQueue; }
TimedMetadataEventSource& TimedMetadataEvent() { return mTimedMetadataEvent; }
// Notified by the OggDemuxer during playback when chained ogg is detected.
MediaEventSource<void>& OnMediaNotSeekable() { return mOnMediaNotSeekable; }
TimedMetadataEventProducer& TimedMetadataProducer() {
return mTimedMetadataEvent;
MediaEventProducer<void>& MediaNotSeekableProducer() {
return mOnMediaNotSeekable;
// Notified if the reader can't decode a sample due to a missing decryption
// key.
MediaEventSource<TrackInfo::TrackType>& OnTrackWaitingForKey() {
return mOnTrackWaitingForKey;
MediaEventProducer<TrackInfo::TrackType>& OnTrackWaitingForKeyProducer() {
return mOnTrackWaitingForKey;
MediaEventSource<nsTArray<uint8_t>, nsString>& OnEncrypted() {
return mOnEncrypted;
MediaEventSource<void>& OnWaitingForKey() { return mOnWaitingForKey; }
MediaEventSource<MediaResult>& OnDecodeWarning() { return mOnDecodeWarning; }
MediaEventSource<VideoInfo>& OnStoreDecoderBenchmark() {
return mOnStoreDecoderBenchmark;
MediaEventProducer<VideoInfo, AudioInfo>& OnTrackInfoUpdatedEvent() {
return mTrackInfoUpdatedEvent;
bool HasVideo() const { return mVideo.mTrackDemuxer; }
bool HasAudio() const { return mAudio.mTrackDemuxer; }
bool IsWaitingOnCDMResource();
bool InitDemuxer();
// Notify the track demuxers that new data has been received.
void NotifyTrackDemuxers();
void ReturnOutput(MediaData* aData, TrackType aTrack);
// Enqueues a task to call Update(aTrack) on the decoder task queue.
// Lock for corresponding track must be held.
void ScheduleUpdate(TrackType aTrack);
void Update(TrackType aTrack);
// Handle actions should more data be received.
// Returns true if no more action is required.
bool UpdateReceivedNewData(TrackType aTrack);
// Called when new samples need to be demuxed.
void RequestDemuxSamples(TrackType aTrack);
// Handle demuxed samples by the input behavior.
void HandleDemuxedSamples(TrackType aTrack,
FrameStatistics::AutoNotifyDecoded& aA);
// Decode any pending already demuxed samples.
void DecodeDemuxedSamples(TrackType aTrack, MediaRawData* aSample);
struct InternalSeekTarget {
InternalSeekTarget(const media::TimeInterval& aTime, bool aDropTarget)
: mTime(aTime),
mHasSeeked(false) {}
media::TimeUnit Time() const { return mTime.mStart; }
media::TimeUnit EndTime() const { return mTime.mEnd; }
bool Contains(const media::TimeUnit& aTime) const {
return mTime.Contains(aTime);
media::TimeInterval mTime;
bool mDropTarget;
bool mWaiting;
bool mHasSeeked;
// Perform an internal seek to aTime. If aDropTarget is true then
// the first sample past the target will be dropped.
void InternalSeek(TrackType aTrack, const InternalSeekTarget& aTarget);
// Return the end time of the internal seek target if it exists. Otherwise,
// return infinity.
media::TimeUnit GetInternalSeekTargetEndTime() const;
// Drain the current decoder.
void DrainDecoder(TrackType aTrack);
void NotifyNewOutput(TrackType aTrack,
MediaDataDecoder::DecodedData&& aResults);
void NotifyError(TrackType aTrack, const MediaResult& aError);
void NotifyWaitingForData(TrackType aTrack);
void NotifyWaitingForKey(TrackType aTrack);
void NotifyEndOfStream(TrackType aTrack);
void ExtractCryptoInitData(nsTArray<uint8_t>& aInitData);
// Initializes mLayersBackendType if possible.
void InitLayersBackendType();
void Reset(TrackType aTrack);
void DropDecodedSamples(TrackType aTrack);
// Return a target timeunit which the reader should skip to, this would be
// either the timethreshold we pass, or the time of the next keyframe. Return
// nothing if we don't need to skip.
// @param aTimeThreshold
// The time that we expect the time of next video frame should be or go beyond
// @param aRequestNextVideoKeyFrame
// If true and the next keyframe's time is larger than aTimeThreshold, skip to
// the next keyframe time instead of aTimeThreshold.
Maybe<media::TimeUnit> ShouldSkip(media::TimeUnit aTimeThreshold,
bool aRequestNextVideoKeyFrame);
void SetVideoDecodeThreshold();
size_t SizeOfQueue(TrackType aTrack);
// Fire a new OnStoreDecoderBenchmark event that will create new
// storage of the decoder benchmark.
// This is called only on TaskQueue.
void NotifyDecoderBenchmarkStore();
void NotifyTrackInfoUpdated();
enum class DrainState {
class SharedShutdownPromiseHolder : public MozPromiseHolder<ShutdownPromise> {
~SharedShutdownPromiseHolder() = default;
struct DecoderData {
DecoderData(MediaFormatReader* aOwner, MediaData::Type aType,
uint32_t aNumOfMaxError)
: mOwner(aOwner),
mHardwareDecodingDisabled(false) {
~DecoderData() {
MediaFormatReader* mOwner;
// Disambiguate Audio vs Video.
MediaData::Type mType;
RefPtr<MediaTrackDemuxer> mTrackDemuxer;
// TaskQueue on which decoder can choose to decode.
// Only non-null up until the decoder is created.
RefPtr<TaskQueue> mTaskQueue;
// Mutex protecting mDescription, mDecoder, mTrackDemuxer, mWorkingInfo,
// mProcessName and mCodecName as those can be read outside the TaskQueue.
// They are only written on the TaskQueue however, as such mMutex doesn't
// need to be held when those members are read on the TaskQueue.
// The platform decoder.
RefPtr<MediaDataDecoder> mDecoder;
nsCString mDescription;
nsCString mProcessName;
nsCString mCodecName;
void ShutdownDecoder();
// Only accessed from reader's task queue.
bool mUpdateScheduled;
bool mDemuxEOS;
bool mWaitingForData;
bool mWaitingForKey;
bool mReceivedNewData;
// Pending seek.
MozPromiseRequestHolder<MediaTrackDemuxer::SeekPromise> mSeekRequest;
// Queued demux samples waiting to be decoded.
nsTArray<RefPtr<MediaRawData>> mQueuedSamples;
MozPromiseRequestHolder<MediaTrackDemuxer::SamplesPromise> mDemuxRequest;
// A WaitingPromise is pending if the demuxer is waiting for data or
// if the decoder is waiting for a key.
MozPromiseHolder<WaitForDataPromise> mWaitingPromise;
bool HasWaitingPromise() const {
return !mWaitingPromise.IsEmpty();
bool IsWaitingForData() const {
return mWaitingForData;
bool IsWaitingForKey() const {
return mWaitingForKey && mDecodeRequest.Exists();
// MediaDataDecoder handler's variables.
MozPromiseRequestHolder<MediaDataDecoder::DecodePromise> mDecodeRequest;
bool mFlushing; // True if flush is in action.
// Set to true if the last operation run on the decoder was a flush.
bool mFlushed;
RefPtr<SharedShutdownPromiseHolder> mShutdownPromise;
MozPromiseRequestHolder<MediaDataDecoder::DecodePromise> mDrainRequest;
DrainState mDrainState;
bool HasPendingDrain() const { return mDrainState != DrainState::None; }
bool HasCompletedDrain() const {
return mDrainState == DrainState::DrainCompleted ||
mDrainState == DrainState::DrainAborted;
void RequestDrain() {
MOZ_RELEASE_ASSERT(mDrainState == DrainState::None);
mDrainState = DrainState::DrainRequested;
// Track decoding error and fail when we hit the limit.
uint32_t mNumOfConsecutiveDecodingError;
uint32_t mMaxConsecutiveDecodingError;
// Track RDD or GPU process crashes and fail when we hit the limit.
uint32_t mNumOfConsecutiveRDDOrGPUCrashes;
uint32_t mMaxConsecutiveRDDOrGPUCrashes;
// Track Utility process crashes and fail when we hit the limit.
uint32_t mNumOfConsecutiveUtilityCrashes;
uint32_t mMaxConsecutiveUtilityCrashes;
// Set when we haven't yet decoded the first frame.
// Cleared once the first frame has been decoded.
// This is used to determine, upon error, if we should try again to decode
// the frame, or skip to the next keyframe.
Maybe<media::TimeUnit> mFirstFrameTime;
Maybe<MediaResult> mError;
bool HasFatalError() const {
if (!mError.isSome()) {
return false;
if (mError.ref() == NS_ERROR_DOM_MEDIA_DECODE_ERR) {
// Allow decode errors to be non-fatal, but give up
// if we have too many, or if warnings should be treated as errors.
return mNumOfConsecutiveDecodingError > mMaxConsecutiveDecodingError ||
// If the caller asked for a new decoder we shouldn't treat
// it as fatal.
return false;
if (mError.ref() ==
// Allow RDD crashes to be non-fatal, but give up
// if we have too many, or if warnings should be treated as errors.
return mNumOfConsecutiveRDDOrGPUCrashes >
mMaxConsecutiveRDDOrGPUCrashes ||
if (mError.ref() ==
bool tooManyConsecutiveCrashes =
mNumOfConsecutiveUtilityCrashes > mMaxConsecutiveUtilityCrashes;
// TODO: Telemetry?
return tooManyConsecutiveCrashes ||
if (mError.ref() ==
return false;
// All other error types are fatal
return true;
// If set, all decoded samples prior mTimeThreshold will be dropped.
// Used for internal seeking when a change of stream is detected or when
// encountering data discontinuity.
Maybe<InternalSeekTarget> mTimeThreshold;
// Time of last decoded sample returned.
Maybe<media::TimeInterval> mLastDecodedSampleTime;
// Decoded samples returned my mDecoder awaiting being returned to
// state machine upon request.
nsTArray<RefPtr<MediaData>> mOutput;
uint64_t mNumSamplesInput;
uint64_t mNumSamplesOutput;
uint64_t mNumSamplesOutputTotal;
uint64_t mNumSamplesSkippedTotal;
// These get overridden in the templated concrete class.
// Indicate if we have a pending promise for decoded frame.
// Rejecting the promise will stop the reader from decoding ahead.
virtual bool HasPromise() const = 0;
virtual void RejectPromise(const MediaResult& aError,
const char* aMethodName) = 0;
// Clear track demuxer related data.
void ResetDemuxer() {
// Flush the decoder if present and reset decoding related data.
// Following a flush, the decoder is ready to accept any new data.
void Flush();
bool CancelWaitingForKey() {
if (!mWaitingForKey) {
return false;
mWaitingForKey = false;
if (IsWaitingForData() || !HasWaitingPromise()) {
return false;
mWaitingPromise.Resolve(mType, __func__);
return true;
// Reset the state of the DecoderData, clearing all queued frames
// (pending demuxed and decoded).
// The track demuxer is *not* reset.
void ResetState() {
mDemuxEOS = false;
mWaitingForData = false;
mDrainState = DrainState::None;
mNumSamplesInput = 0;
mNumSamplesOutput = 0;
mSizeOfQueue = 0;
if (!HasFatalError()) {
bool HasInternalSeekPending() const {
return mTimeThreshold && !mTimeThreshold.ref().mHasSeeked;
// Return the current TrackInfo in the stream. If the stream content never
// changed since AsyncReadMetadata was called then the TrackInfo used is
// mOriginalInfo, other it will be mInfo. The later case is only ever true
// with MSE or the WebMDemuxer.
const TrackInfo* GetCurrentInfo() const {
if (mInfo) {
return *mInfo;
return mOriginalInfo.get();
// Return the current TrackInfo updated as per the decoder output.
// Typically for audio, the number of channels and/or sampling rate can vary
// between what was found in the metadata and what the decoder returned.
const TrackInfo* GetWorkingInfo() const { return mWorkingInfo.get(); }
bool IsEncrypted() const { return GetCurrentInfo()->mCrypto.IsEncrypted(); }
// Used by the MDSM for logging purposes.
Atomic<size_t> mSizeOfQueue;
// Used by the MDSM to determine if video decoding is hardware accelerated.
// This value is updated after a frame is successfully decoded.
Atomic<bool> mIsHardwareAccelerated;
// Sample format monitoring.
uint32_t mLastStreamSourceID;
Maybe<uint32_t> mNextStreamSourceID;
media::TimeIntervals mTimeRanges;
Maybe<media::TimeUnit> mLastTimeRangesEnd;
// TrackInfo as first discovered during ReadMetadata.
UniquePtr<TrackInfo> mOriginalInfo;
// Written exclusively on the TaskQueue, can be read on MDSM's TaskQueue.
// Must be read with parent's mutex held.
UniquePtr<TrackInfo> mWorkingInfo;
RefPtr<TrackInfoSharedPtr> mInfo;
Maybe<media::TimeUnit> mFirstDemuxedSampleTime;
// Use NullDecoderModule or not.
bool mIsNullDecode;
bool mHardwareDecodingDisabled;
// Whether we have reported hardware decoding support for video. Used only
// on reader's task queue,
bool mHasReportedVideoHardwareSupportTelemtry = false;
class {
float Mean() const { return mMean; }
void Update(const media::TimeUnit& aValue) {
if (aValue == media::TimeUnit::Zero()) {
mMean += static_cast<float>((1.0f / aValue.ToSeconds() - mMean) /
void Reset() {
mMean = 0;
mCount = 0;
float mMean = 0;
uint64_t mCount = 0;
} mMeanRate;
template <typename Type>
class DecoderDataWithPromise : public DecoderData {
DecoderDataWithPromise(MediaFormatReader* aOwner, MediaData::Type aType,
uint32_t aNumOfMaxError)
: DecoderData(aOwner, aType, aNumOfMaxError), mHasPromise(false) {
"MediaFormatReader::DecoderDataWithPromise", this,
static_cast<const MediaFormatReader::DecoderData*>(this));
~DecoderDataWithPromise() {
"MediaFormatReader::DecoderDataWithPromise", this);
bool HasPromise() const override { return mHasPromise; }
RefPtr<DataPromise<Type>> EnsurePromise(const char* aMethodName) {
mHasPromise = true;
return mPromise.Ensure(aMethodName);
void ResolvePromise(Type* aData, const char* aMethodName) {
mPromise.Resolve(aData, aMethodName);
mHasPromise = false;
void RejectPromise(const MediaResult& aError,
const char* aMethodName) override {
mPromise.Reject(aError, aMethodName);
mHasPromise = false;
MozPromiseHolder<DataPromise<Type>> mPromise;
Atomic<bool> mHasPromise;
// Decode task queue.
RefPtr<TaskQueue> mTaskQueue;
DecoderDataWithPromise<AudioData> mAudio;
DecoderDataWithPromise<VideoData> mVideo;
Watchable<bool> mWorkingInfoChanged;
WatchManager<MediaFormatReader> mWatchManager;
bool mIsWatchingWorkingInfo;
// Returns true when the decoder for this track needs input.
bool NeedInput(DecoderData& aDecoder);
DecoderData& GetDecoderData(TrackType aTrack);
// Demuxer objects.
class DemuxerProxy;
UniquePtr<DemuxerProxy> mDemuxer;
bool mDemuxerInitDone;
void OnDemuxerInitDone(const MediaResult& aResult);
void OnDemuxerInitFailed(const MediaResult& aError);
MozPromiseRequestHolder<MediaDataDemuxer::InitPromise> mDemuxerInitRequest;
MozPromiseRequestHolder<NotifyDataArrivedPromise> mNotifyDataArrivedPromise;
bool mPendingNotifyDataArrived;
void OnDemuxFailed(TrackType aTrack, const MediaResult& aError);
void DoDemuxVideo();
void OnVideoDemuxCompleted(
const RefPtr<MediaTrackDemuxer::SamplesHolder>& aSamples);
void OnVideoDemuxFailed(const MediaResult& aError) {
OnDemuxFailed(TrackType::kVideoTrack, aError);
void DoDemuxAudio();
void OnAudioDemuxCompleted(
const RefPtr<MediaTrackDemuxer::SamplesHolder>& aSamples);
void OnAudioDemuxFailed(const MediaResult& aError) {
OnDemuxFailed(TrackType::kAudioTrack, aError);
void SkipVideoDemuxToNextKeyFrame(media::TimeUnit aTimeThreshold);
void VideoSkipReset(uint32_t aSkipped);
void OnVideoSkipCompleted(uint32_t aSkipped);
void OnVideoSkipFailed(MediaTrackDemuxer::SkipFailureHolder aFailure);
// The last number of decoded output frames that we've reported to
// MediaDecoder::NotifyDecoded(). We diff the number of output video
// frames every time that DecodeVideoData() is called, and report the
// delta there.
uint64_t mLastReportedNumDecodedFrames;
// Timestamp of the previous decoded keyframe, in microseconds.
int64_t mPreviousDecodedKeyframeTime_us;
// Default mLastDecodedKeyframeTime_us value, must be bigger than anything.
static const int64_t sNoPreviousDecodedKeyframe = INT64_MAX;
RefPtr<layers::KnowsCompositor> mKnowsCompositor;
// Metadata objects
// True if we've read the streams' metadata.
bool mInitDone;
MozPromiseHolder<MetadataPromise> mMetadataPromise;
bool IsEncrypted() const;
// Set to true if any of our track buffers may be blocking.
bool mTrackDemuxersMayBlock;
// Seeking objects.
void SetSeekTarget(const SeekTarget& aTarget);
bool IsSeeking() const { return mPendingSeekTime.isSome(); }
bool IsVideoOnlySeeking() const {
return IsSeeking() && mOriginalSeekTarget.IsVideoOnly();
bool IsAudioOnlySeeking() const {
return IsSeeking() && mOriginalSeekTarget.IsAudioOnly();
void ScheduleSeek();
void AttemptSeek();
void OnSeekFailed(TrackType aTrack, const MediaResult& aError);
void DoVideoSeek();
void OnVideoSeekCompleted(media::TimeUnit aTime);
void OnVideoSeekFailed(const MediaResult& aError);
bool mSeekScheduled;
void DoAudioSeek();
void OnAudioSeekCompleted(media::TimeUnit aTime);
void OnAudioSeekFailed(const MediaResult& aError);
// The SeekTarget that was last given to Seek()
SeekTarget mOriginalSeekTarget;
// Temporary seek information while we wait for the data
Maybe<media::TimeUnit> mFallbackSeekTime;
Maybe<media::TimeUnit> mPendingSeekTime;
MozPromiseHolder<SeekPromise> mSeekPromise;
RefPtr<VideoFrameContainer> mVideoFrameContainer;
layers::ImageContainer* GetImageContainer();
RefPtr<CDMProxy> mCDMProxy;
RefPtr<GMPCrashHelper> mCrashHelper;
void SetNullDecode(TrackType aTrack, bool aIsNullDecode);
class DecoderFactory;
UniquePtr<DecoderFactory> mDecoderFactory;
class ShutdownPromisePool;
UniquePtr<ShutdownPromisePool> mShutdownPromisePool;
MediaEventListener mOnTrackWaitingForKeyListener;
void OnFirstDemuxCompleted(
TrackInfo::TrackType aType,
const RefPtr<MediaTrackDemuxer::SamplesHolder>& aSamples);
void OnFirstDemuxFailed(TrackInfo::TrackType aType,
const MediaResult& aError);
void MaybeResolveMetadataPromise();
// Stores presentation info required for playback.
MediaInfo mInfo;
UniquePtr<MetadataTags> mTags;
// A flag indicating if the start time is known or not.
bool mHasStartTime = false;
void ShutdownDecoder(TrackType aTrack);
RefPtr<ShutdownPromise> TearDownDecoders();
bool mShutdown = false;
// Buffered range.
Canonical<media::TimeIntervals> mBuffered;
// Used to send TimedMetadata to the listener.
TimedMetadataEventProducer mTimedMetadataEvent;
// Notify if this media is not seekable.
MediaEventProducer<void> mOnMediaNotSeekable;
// Notify if we are waiting for a decryption key.
MediaEventProducer<TrackInfo::TrackType> mOnTrackWaitingForKey;
MediaEventProducer<nsTArray<uint8_t>, nsString> mOnEncrypted;
MediaEventProducer<void> mOnWaitingForKey;
MediaEventProducer<MediaResult> mOnDecodeWarning;
MediaEventProducer<VideoInfo> mOnStoreDecoderBenchmark;
MediaEventProducer<VideoInfo, AudioInfo> mTrackInfoUpdatedEvent;
RefPtr<FrameStatistics> mFrameStats;
// Used in bug 1393399 for telemetry.
const MediaDecoderOwnerID mMediaDecoderOwnerID;
bool ResolveSetCDMPromiseIfDone(TrackType aTrack);
void PrepareToSetCDMForTrack(TrackType aTrack);
MozPromiseHolder<SetCDMPromise> mSetCDMPromise;
TrackSet mSetCDMForTracks{};
bool IsDecoderWaitingForCDM(TrackType aTrack);
void GetDebugInfo(dom::MediaFormatReaderDebugInfo& aInfo);
// Only be used on Windows when the media engine playback is enabled.
Maybe<uint64_t> mMediaEngineId;
const Maybe<TrackingId> mTrackingId;
} // namespace mozilla