DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (56e7b9127e89)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169
/* -*- 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 http://mozilla.org/MPL/2.0/. */

#if !defined(MediaSourceDemuxer_h_)
#define MediaSourceDemuxer_h_

#include "MediaDataDemuxer.h"
#include "MediaResource.h"
#include "MediaSource.h"
#include "TrackBuffersManager.h"
#include "mozilla/Atomics.h"
#include "mozilla/Maybe.h"
#include "mozilla/Monitor.h"
#include "mozilla/TaskQueue.h"


namespace mozilla {

class AbstractThread;
class MediaResult;
class MediaSourceTrackDemuxer;

DDLoggedTypeDeclNameAndBase(MediaSourceDemuxer, MediaDataDemuxer);
DDLoggedTypeNameAndBase(MediaSourceTrackDemuxer, MediaTrackDemuxer);

class MediaSourceDemuxer
  : public MediaDataDemuxer
  , public DecoderDoctorLifeLogger<MediaSourceDemuxer>
{
public:
  explicit MediaSourceDemuxer(AbstractThread* aAbstractMainThread);

  RefPtr<InitPromise> Init() override;

  uint32_t GetNumberTracks(TrackInfo::TrackType aType) const override;

  already_AddRefed<MediaTrackDemuxer>
  GetTrackDemuxer(TrackInfo::TrackType aType, uint32_t aTrackNumber) override;

  bool IsSeekable() const override;

  UniquePtr<EncryptionInfo> GetCrypto() override;

  bool ShouldComputeStartTime() const override { return false; }

  /* interface for TrackBuffersManager */
  void AttachSourceBuffer(RefPtr<TrackBuffersManager>& aSourceBuffer);
  void DetachSourceBuffer(RefPtr<TrackBuffersManager>& aSourceBuffer);
  TaskQueue* GetTaskQueue() { return mTaskQueue; }
  void NotifyInitDataArrived();

  // Returns a string describing the state of the MediaSource internal
  // buffered data. Used for debugging purposes.
  void GetMozDebugReaderData(nsACString& aString);

  void AddSizeOfResources(MediaSourceDecoder::ResourceSizes* aSizes);

  // Gap allowed between frames.
  // Due to inaccuracies in determining buffer end
  // frames (Bug 1065207). This value is based on videos seen in the wild.
  static constexpr media::TimeUnit EOS_FUZZ =
    media::TimeUnit::FromMicroseconds(500000);

private:
  ~MediaSourceDemuxer();
  friend class MediaSourceTrackDemuxer;
  // Scan source buffers and update information.
  bool ScanSourceBuffersForContent();
  RefPtr<TrackBuffersManager> GetManager(TrackInfo::TrackType aType);
  TrackInfo* GetTrackInfo(TrackInfo::TrackType);
  void DoAttachSourceBuffer(RefPtr<TrackBuffersManager>&& aSourceBuffer);
  void DoDetachSourceBuffer(RefPtr<TrackBuffersManager>&& aSourceBuffer);
  bool OnTaskQueue()
  {
    return !GetTaskQueue() || GetTaskQueue()->IsCurrentThreadIn();
  }

  RefPtr<TaskQueue> mTaskQueue;
  nsTArray<RefPtr<MediaSourceTrackDemuxer>> mDemuxers;

  nsTArray<RefPtr<TrackBuffersManager>> mSourceBuffers;

  MozPromiseHolder<InitPromise> mInitPromise;

  // Monitor to protect members below across multiple threads.
  mutable Monitor mMonitor;
  RefPtr<TrackBuffersManager> mAudioTrack;
  RefPtr<TrackBuffersManager> mVideoTrack;
  MediaInfo mInfo;
};

class MediaSourceTrackDemuxer
  : public MediaTrackDemuxer
  , public DecoderDoctorLifeLogger<MediaSourceTrackDemuxer>
{
public:
  MediaSourceTrackDemuxer(MediaSourceDemuxer* aParent,
                          TrackInfo::TrackType aType,
                          TrackBuffersManager* aManager);

  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;

  void BreakCycles() override;

  bool GetSamplesMayBlock() const override
  {
    return false;
  }

  bool HasManager(TrackBuffersManager* aManager) const;
  void DetachManager();

private:

  bool OnTaskQueue() const
  {
    MOZ_ASSERT(mParent);
    auto taskQueue = mParent->GetTaskQueue();
    MOZ_ASSERT(taskQueue);
    return taskQueue->IsCurrentThreadIn();
  }

  RefPtr<SeekPromise> DoSeek(const media::TimeUnit& aTime);
  RefPtr<SamplesPromise> DoGetSamples(int32_t aNumSamples);
  RefPtr<SkipAccessPointPromise> DoSkipToNextRandomAccessPoint(
    const media::TimeUnit& aTimeThreadshold);
  already_AddRefed<MediaRawData> GetSample(MediaResult& aError);
  // Return the timestamp of the next keyframe after mLastSampleIndex.
  media::TimeUnit GetNextRandomAccessPoint();

  RefPtr<MediaSourceDemuxer> mParent;
  TrackInfo::TrackType mType;
  // Monitor protecting members below accessed from multiple threads.
  Monitor mMonitor;
  media::TimeUnit mNextRandomAccessPoint;
  // Would be accessed in MFR's demuxer proxy task queue and TaskQueue, and
  // only be set on the TaskQueue. It can be accessed while on TaskQueue without
  // the need for the lock.
  RefPtr<TrackBuffersManager> mManager;

  Maybe<RefPtr<MediaRawData>> mNextSample;
  // Set to true following a reset. Ensure that the next sample demuxed
  // is available at position 0.
  bool mReset;

  // Amount of pre-roll time when seeking.
  // Set to 80ms if track is Opus.
  const media::TimeUnit mPreRoll;
};

} // namespace mozilla

#endif