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The Tor Browser
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SourceBufferAttributes.h (4006B)

      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 mozilla_SourceBufferAttributes_h_
      8 #define mozilla_SourceBufferAttributes_h_
      9 
     10 #include "TimeUnits.h"
     11 #include "mozilla/DefineEnum.h"
     12 #include "mozilla/Maybe.h"
     13 #include "mozilla/dom/SourceBufferBinding.h"
     14 
     15 namespace mozilla {
     16 
     17 class SourceBufferAttributes {
     18 public:
     19  // Current state as per Segment Parser Loop Algorithm
     20  // http://w3c.github.io/media-source/index.html#sourcebuffer-segment-parser-loop
     21  MOZ_DEFINE_ENUM_CLASS_WITH_TOSTRING_AT_CLASS_SCOPE(AppendState,
     22                                                     (WAITING_FOR_SEGMENT,
     23                                                      PARSING_INIT_SEGMENT,
     24                                                      PARSING_MEDIA_SEGMENT));
     25 
     26  explicit SourceBufferAttributes(bool aGenerateTimestamp)
     27      : mGenerateTimestamps(aGenerateTimestamp),
     28        mAppendWindowStart(0),
     29        mAppendWindowEnd(PositiveInfinity<double>()),
     30        mAppendMode(dom::SourceBufferAppendMode::Segments),
     31        mApparentTimestampOffset(0),
     32        mAppendState(AppendState::WAITING_FOR_SEGMENT) {}
     33 
     34  SourceBufferAttributes(const SourceBufferAttributes& aOther) = default;
     35 
     36  double GetAppendWindowStart() const { return mAppendWindowStart; }
     37 
     38  double GetAppendWindowEnd() const { return mAppendWindowEnd; }
     39 
     40  void SetAppendWindowStart(double aWindowStart) {
     41    mAppendWindowStart = aWindowStart;
     42  }
     43 
     44  void SetAppendWindowEnd(double aWindowEnd) { mAppendWindowEnd = aWindowEnd; }
     45 
     46  double GetApparentTimestampOffset() const { return mApparentTimestampOffset; }
     47 
     48  void SetApparentTimestampOffset(double aTimestampOffset) {
     49    mApparentTimestampOffset = aTimestampOffset;
     50    mTimestampOffset = media::TimeUnit::FromSeconds(aTimestampOffset);
     51  }
     52 
     53  media::TimeUnit GetTimestampOffset() const { return mTimestampOffset; }
     54 
     55  void SetTimestampOffset(const media::TimeUnit& aTimestampOffset) {
     56    mTimestampOffset = aTimestampOffset;
     57    mApparentTimestampOffset = aTimestampOffset.ToSeconds();
     58  }
     59 
     60  dom::SourceBufferAppendMode GetAppendMode() const { return mAppendMode; }
     61 
     62  void SetAppendMode(dom::SourceBufferAppendMode aAppendMode) {
     63    mAppendMode = aAppendMode;
     64  }
     65 
     66  void SetGroupStartTimestamp(const media::TimeUnit& aGroupStartTimestamp) {
     67    mGroupStartTimestamp = Some(aGroupStartTimestamp);
     68  }
     69 
     70  media::TimeUnit GetGroupStartTimestamp() const {
     71    return mGroupStartTimestamp.ref();
     72  }
     73 
     74  bool HaveGroupStartTimestamp() const { return mGroupStartTimestamp.isSome(); }
     75 
     76  void ResetGroupStartTimestamp() { mGroupStartTimestamp.reset(); }
     77 
     78  void RestartGroupStartTimestamp() {
     79    mGroupStartTimestamp = Some(mGroupEndTimestamp);
     80  }
     81 
     82  media::TimeUnit GetGroupEndTimestamp() const { return mGroupEndTimestamp; }
     83 
     84  void SetGroupEndTimestamp(const media::TimeUnit& aGroupEndTimestamp) {
     85    mGroupEndTimestamp = aGroupEndTimestamp;
     86  }
     87 
     88  AppendState GetAppendState() const { return mAppendState; }
     89 
     90  void SetAppendState(AppendState aState) { mAppendState = aState; }
     91 
     92  // mGenerateTimestamp isn't mutable once the source buffer has been
     93  // constructed
     94  bool mGenerateTimestamps;
     95 
     96  SourceBufferAttributes& operator=(const SourceBufferAttributes& aOther) =
     97      default;
     98 
     99 private:
    100  SourceBufferAttributes() = delete;
    101 
    102  double mAppendWindowStart;
    103  double mAppendWindowEnd;
    104  dom::SourceBufferAppendMode mAppendMode;
    105  double mApparentTimestampOffset;
    106  media::TimeUnit mTimestampOffset;
    107  Maybe<media::TimeUnit> mGroupStartTimestamp;
    108  media::TimeUnit mGroupEndTimestamp;
    109  // The current append state as per
    110  // https://w3c.github.io/media-source/#sourcebuffer-append-state
    111  AppendState mAppendState;
    112 };
    113 
    114 }  // end namespace mozilla
    115 
    116 #endif /* mozilla_SourceBufferAttributes_h_ */