dom/media/VideoStreamTrack.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   4  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "VideoStreamTrack.h"
   7
   8 #include "MediaTrackGraph.h"
   9 #include "MediaTrackListener.h"
  10 #include "nsContentUtils.h"
  11 #include "nsGlobalWindowInner.h"
  12 #include "VideoOutput.h"
  13
  14 namespace mozilla::dom {
  15
  16 VideoStreamTrack::VideoStreamTrack(nsPIDOMWindowInner* aWindow,
  17                                    mozilla::MediaTrack* aInputTrack,
  18                                    MediaStreamTrackSource* aSource,
  19                                    MediaStreamTrackState aReadyState,
  20                                    bool aMuted,
  21                                    const MediaTrackConstraints& aConstraints)
  22     : MediaStreamTrack(aWindow, aInputTrack, aSource, aReadyState, aMuted,
  23                        aConstraints) {}
  24
  25 void VideoStreamTrack::Destroy() {
  26   mVideoOutputs.Clear();
  27   MediaStreamTrack::Destroy();
  28 }
  29
  30 void VideoStreamTrack::AddVideoOutput(VideoFrameContainer* aSink) {
  31   if (Ended()) {
  32     return;
  33   }
  34   auto output = MakeRefPtr<VideoOutput>(aSink, AbstractThread::MainThread());
  35   AddVideoOutput(output);
  36 }
  37
  38 void VideoStreamTrack::AddVideoOutput(VideoOutput* aOutput) {
  39   if (Ended()) {
  40     return;
  41   }
  42   for (const auto& output : mVideoOutputs) {
  43     if (output == aOutput) {
  44       MOZ_ASSERT_UNREACHABLE("A VideoOutput was already added");
  45       return;
  46     }
  47   }
  48   mVideoOutputs.AppendElement(aOutput);
  49   AddDirectListener(aOutput);
  50   AddListener(aOutput);
  51 }
  52
  53 void VideoStreamTrack::RemoveVideoOutput(VideoFrameContainer* aSink) {
  54   for (const auto& output : mVideoOutputs.Clone()) {
  55     if (output->mVideoFrameContainer == aSink) {
  56       mVideoOutputs.RemoveElement(output);
  57       RemoveDirectListener(output);
  58       RemoveListener(output);
  59     }
  60   }
  61 }
  62
  63 void VideoStreamTrack::RemoveVideoOutput(VideoOutput* aOutput) {
  64   for (const auto& output : mVideoOutputs.Clone()) {
  65     if (output == aOutput) {
  66       mVideoOutputs.RemoveElement(aOutput);
  67       RemoveDirectListener(aOutput);
  68       RemoveListener(aOutput);
  69     }
  70   }
  71 }
  72
  73 void VideoStreamTrack::GetLabel(nsAString& aLabel, CallerType aCallerType) {
  74   nsIGlobalObject* global =
  75       GetParentObject() ? GetParentObject()->AsGlobal() : nullptr;
  76   if (nsContentUtils::ShouldResistFingerprinting(aCallerType, global,
  77                                                  RFPTarget::StreamTrackLabel)) {
  78     aLabel.AssignLiteral("Internal Camera");
  79     return;
  80   }
  81   MediaStreamTrack::GetLabel(aLabel, aCallerType);
  82 }
  83
  84 already_AddRefed<MediaStreamTrack> VideoStreamTrack::CloneInternal() {
  85   return do_AddRef(new VideoStreamTrack(mWindow, mInputTrack, mSource,
  86                                         ReadyState(), Muted(), mConstraints));
  87 }
  88
  89 }  // namespace mozilla::dom