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>(
  35       aSink, nsGlobalWindowInner::Cast(GetParentObject())
  36                  ->AbstractMainThreadFor(TaskCategory::Other));
  37   AddVideoOutput(output);
  38 }
  39
  40 void VideoStreamTrack::AddVideoOutput(VideoOutput* aOutput) {
  41   if (Ended()) {
  42     return;
  43   }
  44   for (const auto& output : mVideoOutputs) {
  45     if (output == aOutput) {
  46       MOZ_ASSERT_UNREACHABLE("A VideoOutput was already added");
  47       return;
  48     }
  49   }
  50   mVideoOutputs.AppendElement(aOutput);
  51   AddDirectListener(aOutput);
  52   AddListener(aOutput);
  53 }
  54
  55 void VideoStreamTrack::RemoveVideoOutput(VideoFrameContainer* aSink) {
  56   for (const auto& output : mVideoOutputs.Clone()) {
  57     if (output->mVideoFrameContainer == aSink) {
  58       mVideoOutputs.RemoveElement(output);
  59       RemoveDirectListener(output);
  60       RemoveListener(output);
  61     }
  62   }
  63 }
  64
  65 void VideoStreamTrack::RemoveVideoOutput(VideoOutput* aOutput) {
  66   for (const auto& output : mVideoOutputs.Clone()) {
  67     if (output == aOutput) {
  68       mVideoOutputs.RemoveElement(aOutput);
  69       RemoveDirectListener(aOutput);
  70       RemoveListener(aOutput);
  71     }
  72   }
  73 }
  74
  75 void VideoStreamTrack::GetLabel(nsAString& aLabel, CallerType aCallerType) {
  76   nsIGlobalObject* global =
  77       GetParentObject() ? GetParentObject()->AsGlobal() : nullptr;
  78   if (nsContentUtils::ShouldResistFingerprinting(aCallerType, global,
  79                                                  RFPTarget::StreamTrackLabel)) {
  80     aLabel.AssignLiteral("Internal Camera");
  81     return;
  82   }
  83   MediaStreamTrack::GetLabel(aLabel, aCallerType);
  84 }
  85
  86 already_AddRefed<MediaStreamTrack> VideoStreamTrack::CloneInternal() {
  87   return do_AddRef(new VideoStreamTrack(mWindow, mInputTrack, mSource,
  88                                         ReadyState(), Muted(), mConstraints));
  89 }
  90
  91 }  // namespace mozilla::dom