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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 */
#ifndef WebMDemuxer_h_
#define WebMDemuxer_h_
#include "nsTArray.h"
#include "MediaDataDemuxer.h"
#include "MediaResource.h"
#include "NesteggPacketHolder.h"
#include <deque>
#include <stdint.h>
#include <utility>
typedef struct nestegg nestegg;
namespace mozilla {
class WebMBufferedState;
// Queue for holding MediaRawData samples
class MediaRawDataQueue {
typedef std::deque<RefPtr<MediaRawData>> ContainerType;
uint32_t GetSize() { return mQueue.size(); }
void Push(MediaRawData* aItem) { mQueue.push_back(aItem); }
void Push(already_AddRefed<MediaRawData>&& aItem) {
void PushFront(MediaRawData* aItem) { mQueue.push_front(aItem); }
void PushFront(already_AddRefed<MediaRawData>&& aItem) {
void PushFront(MediaRawDataQueue&& aOther) {
while (!aOther.mQueue.empty()) {
already_AddRefed<MediaRawData> PopFront() {
RefPtr<MediaRawData> result = std::move(mQueue.front());
return result.forget();
already_AddRefed<MediaRawData> Pop() {
RefPtr<MediaRawData> result = std::move(mQueue.back());
return result.forget();
void Reset() {
while (!mQueue.empty()) {
MediaRawDataQueue& operator=(const MediaRawDataQueue& aOther) = delete;
const RefPtr<MediaRawData>& First() const { return mQueue.front(); }
const RefPtr<MediaRawData>& Last() const { return mQueue.back(); }
// Methods for range-based for loops.
ContainerType::iterator begin() { return mQueue.begin(); }
ContainerType::const_iterator begin() const { return mQueue.begin(); }
ContainerType::iterator end() { return mQueue.end(); }
ContainerType::const_iterator end() const { return mQueue.end(); }
ContainerType mQueue;
class WebMTrackDemuxer;
DDLoggedTypeDeclNameAndBase(WebMDemuxer, MediaDataDemuxer);
DDLoggedTypeNameAndBase(WebMTrackDemuxer, MediaTrackDemuxer);
class WebMDemuxer : public MediaDataDemuxer,
public DecoderDoctorLifeLogger<WebMDemuxer> {
explicit WebMDemuxer(MediaResource* aResource);
// Indicate if the WebMDemuxer is to be used with MediaSource. In which
// case the demuxer will stop reads to the last known complete block.
WebMDemuxer(MediaResource* aResource, bool aIsMediaSource);
RefPtr<InitPromise> Init() override;
uint32_t GetNumberTracks(TrackInfo::TrackType aType) const override;
UniquePtr<TrackInfo> GetTrackInfo(TrackInfo::TrackType aType,
size_t aTrackNumber) const;
already_AddRefed<MediaTrackDemuxer> GetTrackDemuxer(
TrackInfo::TrackType aType, uint32_t aTrackNumber) override;
bool IsSeekable() const override;
bool IsSeekableOnlyInBufferedRanges() const override;
UniquePtr<EncryptionInfo> GetCrypto() override;
bool GetOffsetForTime(uint64_t aTime, int64_t* aOffset);
// Demux next WebM packet and append samples to MediaRawDataQueue
nsresult GetNextPacket(TrackInfo::TrackType aType,
MediaRawDataQueue* aSamples);
void Reset(TrackInfo::TrackType aType);
// Pushes a packet to the front of the audio packet queue.
void PushAudioPacket(NesteggPacketHolder* aItem);
// Pushes a packet to the front of the video packet queue.
void PushVideoPacket(NesteggPacketHolder* aItem);
// Public accessor for nestegg callbacks
bool IsMediaSource() const { return mIsMediaSource; }
int64_t LastWebMBlockOffset() const { return mLastWebMBlockOffset; }
struct NestEggContext {
NestEggContext(WebMDemuxer* aParent, MediaResource* aResource)
: mParent(aParent), mResource(aResource), mContext(nullptr) {}
int Init();
// Public accessor for nestegg callbacks
bool IsMediaSource() const { return mParent->IsMediaSource(); }
MediaResourceIndex* GetResource() { return &mResource; }
int64_t GetEndDataOffset() const {
return (!mParent->IsMediaSource() || mParent->LastWebMBlockOffset() < 0)
? mResource.GetLength()
: mParent->LastWebMBlockOffset();
WebMDemuxer* mParent;
MediaResourceIndex mResource;
nestegg* mContext;
friend class WebMTrackDemuxer;
void InitBufferedState();
nsresult ReadMetadata();
void NotifyDataArrived() override;
void NotifyDataRemoved() override;
void EnsureUpToDateIndex();
media::TimeIntervals GetBuffered();
nsresult SeekInternal(TrackInfo::TrackType aType,
const media::TimeUnit& aTarget);
CryptoTrack GetTrackCrypto(TrackInfo::TrackType aType, size_t aTrackNumber);
// Read a packet from the nestegg file. Returns nullptr if all packets for
// the particular track have been read. Pass TrackInfo::kVideoTrack or
// TrackInfo::kVideoTrack to indicate the type of the packet we want to read.
nsresult NextPacket(TrackInfo::TrackType aType,
RefPtr<NesteggPacketHolder>& aPacket);
// Internal method that demuxes the next packet from the stream. The caller
// is responsible for making sure it doesn't get lost.
nsresult DemuxPacket(TrackInfo::TrackType aType,
RefPtr<NesteggPacketHolder>& aPacket);
// libnestegg audio and video context for webm container.
// Access on reader's thread only.
NestEggContext mVideoContext;
NestEggContext mAudioContext;
MediaResourceIndex& Resource(TrackInfo::TrackType aType) {
return aType == TrackInfo::kVideoTrack ? mVideoContext.mResource
: mAudioContext.mResource;
nestegg* Context(TrackInfo::TrackType aType) const {
return aType == TrackInfo::kVideoTrack ? mVideoContext.mContext
: mAudioContext.mContext;
MediaInfo mInfo;
nsTArray<RefPtr<WebMTrackDemuxer>> mDemuxers;
// Parser state and computed offset-time mappings. Shared by multiple
// readers when decoder has been cloned. Main thread only.
RefPtr<WebMBufferedState> mBufferedState;
RefPtr<MediaByteBuffer> mInitData;
// Queue of video and audio packets that have been read but not decoded.
WebMPacketQueue mVideoPackets;
WebMPacketQueue mAudioPackets;
// Index of video and audio track to play
uint32_t mVideoTrack;
uint32_t mAudioTrack;
// Nanoseconds to discard after seeking.
uint64_t mSeekPreroll;
// Calculate the frame duration from the last decodeable frame using the
// previous frame's timestamp. In NS.
Maybe<int64_t> mLastAudioFrameTime;
Maybe<int64_t> mLastVideoFrameTime;
// Codec ID of audio track
int mAudioCodec;
// Codec ID of video track
int mVideoCodec;
// Booleans to indicate if we have audio and/or video data
bool mHasVideo;
bool mHasAudio;
bool mNeedReIndex;
// The last complete block parsed by the WebMBufferedState. -1 if not set.
// We cache those values rather than retrieving them for performance reasons
// as nestegg only performs 1-byte read at a time.
int64_t mLastWebMBlockOffset;
const bool mIsMediaSource;
EncryptionInfo mCrypto;
class WebMTrackDemuxer : public MediaTrackDemuxer,
public DecoderDoctorLifeLogger<WebMTrackDemuxer> {
WebMTrackDemuxer(WebMDemuxer* aParent, TrackInfo::TrackType aType,
uint32_t aTrackNumber);
UniquePtr<TrackInfo> GetInfo() const override;
RefPtr<SeekPromise> Seek(const media::TimeUnit& aTime) override;
RefPtr<SamplesPromise> GetSamples(int32_t aNumSamples = 1) override;
void Reset() override;
nsresult GetNextRandomAccessPoint(media::TimeUnit* aTime) override;
RefPtr<SkipAccessPointPromise> SkipToNextRandomAccessPoint(
const media::TimeUnit& aTimeThreshold) override;
media::TimeIntervals GetBuffered() override;
int64_t GetEvictionOffset(const media::TimeUnit& aTime) override;
void BreakCycles() override;
friend class WebMDemuxer;
void UpdateSamples(const nsTArray<RefPtr<MediaRawData>>& aSamples);
void SetNextKeyFrameTime();
nsresult NextSample(RefPtr<MediaRawData>& aData);
RefPtr<WebMDemuxer> mParent;
TrackInfo::TrackType mType;
UniquePtr<TrackInfo> mInfo;
Maybe<media::TimeUnit> mNextKeyframeTime;
bool mNeedKeyframe;
// Queued samples extracted by the demuxer, but not yet returned.
MediaRawDataQueue mSamples;
} // namespace mozilla