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-rw-r--r--dom/media/webaudio/MediaElementAudioSourceNode.cpp105
1 files changed, 105 insertions, 0 deletions
diff --git a/dom/media/webaudio/MediaElementAudioSourceNode.cpp b/dom/media/webaudio/MediaElementAudioSourceNode.cpp
new file mode 100644
index 0000000000..d02ef2f4de
--- /dev/null
+++ b/dom/media/webaudio/MediaElementAudioSourceNode.cpp
@@ -0,0 +1,105 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "MediaElementAudioSourceNode.h"
+#include "mozilla/dom/MediaElementAudioSourceNodeBinding.h"
+#include "AudioDestinationNode.h"
+#include "AudioNodeTrack.h"
+#include "MediaStreamTrack.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(MediaElementAudioSourceNode)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(MediaElementAudioSourceNode)
+ tmp->Destroy();
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mElement)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(AudioNode)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(MediaElementAudioSourceNode,
+ MediaStreamAudioSourceNode)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaElementAudioSourceNode)
+NS_INTERFACE_MAP_END_INHERITING(MediaStreamAudioSourceNode)
+
+NS_IMPL_ADDREF_INHERITED(MediaElementAudioSourceNode,
+ MediaStreamAudioSourceNode)
+NS_IMPL_RELEASE_INHERITED(MediaElementAudioSourceNode,
+ MediaStreamAudioSourceNode)
+
+MediaElementAudioSourceNode::MediaElementAudioSourceNode(
+ AudioContext* aContext, HTMLMediaElement* aElement)
+ : MediaStreamAudioSourceNode(aContext, TrackChangeBehavior::FollowChanges),
+ mElement(aElement) {
+ MOZ_ASSERT(aElement);
+}
+
+/* static */
+already_AddRefed<MediaElementAudioSourceNode>
+MediaElementAudioSourceNode::Create(
+ AudioContext& aAudioContext, const MediaElementAudioSourceOptions& aOptions,
+ ErrorResult& aRv) {
+ // The spec has a pointless check here. See
+ // https://github.com/WebAudio/web-audio-api/issues/2149
+ MOZ_RELEASE_ASSERT(!aAudioContext.IsOffline(), "Bindings messed up?");
+
+ RefPtr<MediaElementAudioSourceNode> node =
+ new MediaElementAudioSourceNode(&aAudioContext, aOptions.mMediaElement);
+
+ RefPtr<DOMMediaStream> stream = aOptions.mMediaElement->CaptureAudio(
+ aRv, aAudioContext.Destination()->Track()->Graph());
+ if (aRv.Failed()) {
+ return nullptr;
+ }
+ MOZ_ASSERT(stream, "CaptureAudio should report failure via aRv!");
+
+ node->Init(*stream, aRv);
+ if (aRv.Failed()) {
+ return nullptr;
+ }
+
+ node->ListenForAllowedToPlay(aOptions);
+ return node.forget();
+}
+
+JSObject* MediaElementAudioSourceNode::WrapObject(
+ JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+ return MediaElementAudioSourceNode_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void MediaElementAudioSourceNode::ListenForAllowedToPlay(
+ const MediaElementAudioSourceOptions& aOptions) {
+ if (!GetAbstractMainThread()) {
+ // The AudioContext must have been closed. It won't be able to start anyway.
+ return;
+ }
+
+ aOptions.mMediaElement->GetAllowedToPlayPromise()
+ ->Then(
+ GetAbstractMainThread(), __func__,
+ // Capture by reference to bypass the mozilla-refcounted-inside-lambda
+ // static analysis. We capture a non-owning reference so as to allow
+ // cycle collection of the node. The reference is cleared via
+ // DisconnectIfExists() from Destroy() when the node is collected.
+ [&self = *this]() {
+ self.Context()->StartBlockedAudioContextIfAllowed();
+ self.mAllowedToPlayRequest.Complete();
+ })
+ ->Track(mAllowedToPlayRequest);
+}
+
+void MediaElementAudioSourceNode::Destroy() {
+ mAllowedToPlayRequest.DisconnectIfExists();
+ MediaStreamAudioSourceNode::Destroy();
+}
+
+HTMLMediaElement* MediaElementAudioSourceNode::MediaElement() {
+ return mElement;
+}
+
+} // namespace mozilla::dom