tor-browser

The Tor Browser
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SeekTarget.h (2574B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef SEEK_TARGET_H
      8 #define SEEK_TARGET_H
      9 
     10 #include "TimeUnits.h"
     11 #include "mozilla/DefineEnum.h"
     12 
     13 namespace mozilla {
     14 
     15 enum class MediaDecoderEventVisibility : int8_t { Observable, Suppressed };
     16 
     17 // Stores the seek target. It includes (1) the time to seek to (2) type of seek
     18 // (accurate, previous keyframe, next keyframe) (3) the type of track needs to
     19 // performs seeking.
     20 struct SeekTarget {
     21  enum Type {
     22    Invalid,
     23    PrevSyncPoint,
     24    Accurate,
     25    NextFrame,
     26  };
     27  MOZ_DEFINE_ENUM_WITH_TOSTRING_AT_CLASS_SCOPE(Track,
     28                                               (All, AudioOnly, VideoOnly));
     29  SeekTarget()
     30      : mTime(media::TimeUnit::Invalid()),
     31        mType(SeekTarget::Invalid),
     32        mTargetTrack(Track::All) {}
     33  SeekTarget(const media::TimeUnit& aTime, Type aType,
     34             Track aTrack = Track::All)
     35      : mTime(aTime), mType(aType), mTargetTrack(aTrack) {
     36    MOZ_ASSERT(mTime.IsValid());
     37  }
     38  SeekTarget(const SeekTarget& aOther)
     39      : mTime(aOther.mTime),
     40        mType(aOther.mType),
     41        mTargetTrack(aOther.mTargetTrack) {
     42    MOZ_ASSERT(mTime.IsValid());
     43  }
     44  media::TimeUnit GetTime() const {
     45    MOZ_ASSERT(mTime.IsValid(), "Invalid SeekTarget");
     46    return mTime;
     47  }
     48  void SetTime(const media::TimeUnit& aTime) {
     49    MOZ_ASSERT(aTime.IsValid(), "Invalid SeekTarget destination");
     50    mTime = aTime;
     51  }
     52  void SetType(Type aType) { mType = aType; }
     53  bool IsFast() const { return mType == SeekTarget::Type::PrevSyncPoint; }
     54  bool IsAccurate() const { return mType == SeekTarget::Type::Accurate; }
     55  bool IsNextFrame() const { return mType == SeekTarget::Type::NextFrame; }
     56  bool IsVideoOnly() const { return mTargetTrack == Track::VideoOnly; }
     57  bool IsAudioOnly() const { return mTargetTrack == Track::AudioOnly; }
     58  bool IsAllTracks() const { return mTargetTrack == Track::All; }
     59  Type GetType() const { return mType; }
     60  Track GetTrack() const { return mTargetTrack; }
     61 
     62 private:
     63  // Seek target time.
     64  media::TimeUnit mTime;
     65  // Whether we should seek "Fast", or "Accurate".
     66  // "Fast" seeks to the seek point preceding mTime, whereas
     67  // "Accurate" seeks as close as possible to mTime.
     68  Type mType;
     69  Track mTargetTrack;
     70 };
     71 
     72 }  // namespace mozilla
     73 
     74 #endif /* SEEK_TARGET_H */