1 files changed, 84 insertions, 0 deletions
diff --git a/dom/html/PlayPromise.cpp b/dom/html/PlayPromise.cpp
new file mode 100644
index 0000000000..ee33b3ad68
--- /dev/null
+++ b/dom/html/PlayPromise.cpp
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "mozilla/dom/PlayPromise.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Telemetry.h"
+
+extern mozilla::LazyLogModule gMediaElementLog;
+
+#define PLAY_PROMISE_LOG(msg, ...) \
+  MOZ_LOG(gMediaElementLog, LogLevel::Debug, (msg, ##__VA_ARGS__))
+
+namespace mozilla::dom {
+
+PlayPromise::PlayPromise(nsIGlobalObject* aGlobal) : Promise(aGlobal) {}
+
+PlayPromise::~PlayPromise() {
+  if (!mFulfilled && PromiseObj()) {
+    MaybeReject(NS_ERROR_DOM_ABORT_ERR);
+  }
+}
+
+/* static */
+already_AddRefed<PlayPromise> PlayPromise::Create(nsIGlobalObject* aGlobal,
+                                                  ErrorResult& aRv) {
+  RefPtr<PlayPromise> promise = new PlayPromise(aGlobal);
+  promise->CreateWrapper(aRv);
+  return aRv.Failed() ? nullptr : promise.forget();
+}
+
+/* static */
+void PlayPromise::ResolvePromisesWithUndefined(
+    const PlayPromiseArr& aPromises) {
+  for (const auto& promise : aPromises) {
+    promise->MaybeResolveWithUndefined();
+  }
+}
+
+/* static */
+void PlayPromise::RejectPromises(const PlayPromiseArr& aPromises,
+                                 nsresult aError) {
+  for (const auto& promise : aPromises) {
+    promise->MaybeReject(aError);
+  }
+}
+
+void PlayPromise::MaybeResolveWithUndefined() {
+  if (mFulfilled) {
+    return;
+  }
+  mFulfilled = true;
+  PLAY_PROMISE_LOG("PlayPromise %p resolved with undefined", this);
+  Promise::MaybeResolveWithUndefined();
+}
+
+static const char* ToPlayResultStr(nsresult aReason) {
+  switch (aReason) {
+    case NS_ERROR_DOM_MEDIA_NOT_ALLOWED_ERR:
+      return "NotAllowedErr";
+    case NS_ERROR_DOM_MEDIA_NOT_SUPPORTED_ERR:
+      return "SrcNotSupportedErr";
+    case NS_ERROR_DOM_MEDIA_ABORT_ERR:
+      return "PauseAbortErr";
+    case NS_ERROR_DOM_ABORT_ERR:
+      return "AbortErr";
+    default:
+      return "UnknownErr";
+  }
+}
+
+void PlayPromise::MaybeReject(nsresult aReason) {
+  if (mFulfilled) {
+    return;
+  }
+  mFulfilled = true;
+  PLAY_PROMISE_LOG("PlayPromise %p rejected with 0x%x (%s)", this,
+                   static_cast<uint32_t>(aReason), ToPlayResultStr(aReason));
+  Promise::MaybeReject(aReason);
+}
+
+}  // namespace mozilla::dom