tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

RTCEncodedFrameBase.cpp (3367B)

      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 "jsapi/RTCEncodedFrameBase.h"
      8 
      9 #include "api/frame_transformer_interface.h"
     10 #include "js/ArrayBuffer.h"
     11 #include "js/GCAPI.h"
     12 #include "mozilla/dom/ScriptSettings.h"
     13 #include "nsIGlobalObject.h"
     14 
     15 namespace mozilla::dom {
     16 
     17 NS_IMPL_CYCLE_COLLECTION_CLASS(RTCEncodedFrameBase)
     18 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(RTCEncodedFrameBase)
     19  using ::ImplCycleCollectionUnlink;
     20  tmp->DetachData();
     21  NS_IMPL_CYCLE_COLLECTION_UNLINK(mGlobal)
     22  NS_IMPL_CYCLE_COLLECTION_UNLINK(mData)
     23 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
     24 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(RTCEncodedFrameBase)
     25  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mGlobal)
     26 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
     27 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(RTCEncodedFrameBase)
     28  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBERS(mData)
     29 NS_IMPL_CYCLE_COLLECTION_TRACE_END
     30 
     31 NS_IMPL_CYCLE_COLLECTING_ADDREF(RTCEncodedFrameBase)
     32 NS_IMPL_CYCLE_COLLECTING_RELEASE(RTCEncodedFrameBase)
     33 
     34 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(RTCEncodedFrameBase)
     35  NS_INTERFACE_MAP_ENTRY(nsISupports)
     36 NS_INTERFACE_MAP_END
     37 
     38 RTCEncodedFrameBase::RTCEncodedFrameBase(nsIGlobalObject* aGlobal,
     39                                         RTCEncodedFrameState& aState)
     40    : mGlobal(aGlobal), mState(aState), mData(nullptr) {
     41  mState.mTimestamp = mState.mFrame->GetTimestamp();
     42  AutoJSAPI jsapi;
     43  if (NS_WARN_IF(!jsapi.Init(mGlobal))) {
     44    return;
     45  }
     46 
     47  // Avoid a copy
     48  mData = JS::NewArrayBufferWithUserOwnedContents(
     49      jsapi.cx(), mState.mFrame->GetData().size(),
     50      (void*)(mState.mFrame->GetData().data()));
     51 }
     52 
     53 RTCEncodedFrameState::RTCEncodedFrameState(
     54    std::unique_ptr<webrtc::TransformableFrameInterface> aFrame,
     55    uint64_t aCounter, unsigned long aTimestamp)
     56    : mFrame(std::move(aFrame)), mCounter(aCounter), mTimestamp(aTimestamp) {}
     57 
     58 RTCEncodedFrameBase::~RTCEncodedFrameBase() { DetachData(); }
     59 
     60 void RTCEncodedFrameBase::DetachData() {
     61  // We might have handled this in unlink already
     62  if (mGlobal) {
     63    AutoJSAPI jsapi;
     64    if (NS_WARN_IF(!jsapi.Init(mGlobal))) {
     65      return;
     66    }
     67 
     68    JS::Rooted<JSObject*> rootedData(jsapi.cx(), mData);
     69    if (rootedData) {
     70      JS::DetachArrayBuffer(jsapi.cx(), rootedData);
     71    }
     72  }
     73 }
     74 
     75 unsigned long RTCEncodedFrameBase::Timestamp() const {
     76  return mState.mTimestamp;
     77 }
     78 
     79 void RTCEncodedFrameBase::SetData(const ArrayBuffer& aData) {
     80  DetachData();
     81  mData.set(aData.Obj());
     82  if (mState.mFrame) {
     83    aData.ProcessData([&](const Span<uint8_t>& aData, JS::AutoCheckCannotGC&&) {
     84      mState.mFrame->SetData(
     85          webrtc::ArrayView<const uint8_t>(aData.Elements(), aData.Length()));
     86    });
     87  }
     88 }
     89 
     90 void RTCEncodedFrameBase::GetData(JSContext* aCx,
     91                                  JS::Rooted<JSObject*>* aObj) const {
     92  aObj->set(mData);
     93 }
     94 
     95 uint64_t RTCEncodedFrameBase::GetCounter() const { return mState.mCounter; }
     96 
     97 std::unique_ptr<webrtc::TransformableFrameInterface>
     98 RTCEncodedFrameBase::TakeFrame() {
     99  DetachData();
    100  return std::move(mState.mFrame);
    101 }
    102 
    103 RTCEncodedFrameState::~RTCEncodedFrameState() = default;
    104 
    105 }  // namespace mozilla::dom