tor-browser

The Tor Browser
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RTCRtpScriptTransform.cpp (3600B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=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 https://mozilla.org/MPL/2.0/. */
      6 
      7 #include "RTCRtpScriptTransform.h"
      8 
      9 #include "ErrorList.h"
     10 #include "js/RootingAPI.h"
     11 #include "jsapi/RTCTransformEventRunnable.h"
     12 #include "libwebrtcglue/FrameTransformerProxy.h"
     13 #include "mozilla/AlreadyAddRefed.h"
     14 #include "mozilla/Logging.h"
     15 #include "mozilla/RefPtr.h"
     16 #include "mozilla/dom/MessagePortBinding.h"
     17 #include "mozilla/dom/Promise.h"
     18 #include "mozilla/dom/RTCRtpScriptTransformBinding.h"
     19 #include "mozilla/dom/Worker.h"
     20 #include "nsCOMPtr.h"
     21 #include "nsContentUtils.h"
     22 #include "nsCycleCollectionParticipant.h"
     23 #include "nsDebug.h"
     24 #include "nsISupports.h"
     25 #include "nsPIDOMWindow.h"
     26 #include "nsWrapperCache.h"
     27 
     28 namespace mozilla::dom {
     29 
     30 LazyLogModule gScriptTransformLog("RTCRtpScriptTransform");
     31 
     32 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(RTCRtpScriptTransform, mWindow)
     33 NS_IMPL_CYCLE_COLLECTING_ADDREF(RTCRtpScriptTransform)
     34 NS_IMPL_CYCLE_COLLECTING_RELEASE(RTCRtpScriptTransform)
     35 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(RTCRtpScriptTransform)
     36  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
     37  NS_INTERFACE_MAP_ENTRY(nsISupports)
     38 NS_INTERFACE_MAP_END
     39 
     40 already_AddRefed<RTCRtpScriptTransform> RTCRtpScriptTransform::Constructor(
     41    const GlobalObject& aGlobal, Worker& aWorker,
     42    JS::Handle<JS::Value> aOptions,
     43    const Optional<Sequence<JSObject*>>& aTransfer, ErrorResult& aRv) {
     44  nsCOMPtr<nsPIDOMWindowInner> ownerWindow =
     45      do_QueryInterface(aGlobal.GetAsSupports());
     46  if (NS_WARN_IF(!ownerWindow)) {
     47    aRv.Throw(NS_ERROR_FAILURE);
     48    return nullptr;
     49  }
     50 
     51  // The spec currently fails to describe what to do when the worker is closing
     52  // or closed; the following placeholder text can be found in the spec at:
     53  // https://w3c.github.io/webrtc-encoded-transform/#dom-rtcrtpscripttransform-rtcrtpscripttransform
     54  //
     55  // > FIXME: Describe error handling (worker closing flag true at
     56  // > RTCRtpScriptTransform creation time. And worker being terminated while
     57  // > transform is processing data).
     58  //
     59  // Because our worker runnables do not like to be pointed at a nonexistant
     60  // worker, we throw in this case.
     61  if (!aWorker.IsEligibleForMessaging()) {
     62    aRv.Throw(NS_ERROR_FAILURE);
     63    return nullptr;
     64  }
     65 
     66  auto newTransform = MakeRefPtr<RTCRtpScriptTransform>(ownerWindow);
     67  RefPtr<RTCTransformEventRunnable> runnable =
     68      new RTCTransformEventRunnable(aWorker, &newTransform->GetProxy());
     69 
     70  if (aTransfer.WasPassed()) {
     71    aWorker.PostEventWithOptions(aGlobal.Context(), aOptions, aTransfer.Value(),
     72                                 runnable, aRv);
     73  } else {
     74    StructuredSerializeOptions transferOptions;
     75    aWorker.PostEventWithOptions(aGlobal.Context(), aOptions,
     76                                 transferOptions.mTransfer, runnable, aRv);
     77  }
     78 
     79  if (NS_WARN_IF(aRv.Failed())) {
     80    return nullptr;
     81  }
     82 
     83  return newTransform.forget();
     84 }
     85 
     86 RTCRtpScriptTransform::RTCRtpScriptTransform(nsPIDOMWindowInner* aWindow)
     87    : mWindow(aWindow), mProxy(new FrameTransformerProxy) {}
     88 
     89 RTCRtpScriptTransform::~RTCRtpScriptTransform() {
     90  mProxy->ReleaseScriptTransformer();
     91 }
     92 
     93 JSObject* RTCRtpScriptTransform::WrapObject(JSContext* aCx,
     94                                            JS::Handle<JSObject*> aGivenProto) {
     95  return RTCRtpScriptTransform_Binding::Wrap(aCx, this, aGivenProto);
     96 }
     97 
     98 }  // namespace mozilla::dom
     99 
    100 #undef LOGTAG