author alwu <>
Fri, 11 Jan 2019 20:43:01 +0000
changeset 453532 c34e287f2f7c
parent 452368 6a89226d8c15
permissions -rw-r--r--
Bug 1513733 - part2 : try to start AudioContext when media element which is as a source for web audio starts r=cpearce,karlt If media element is used as a source for AudioContext, we would try to start AudioContext which was not allowed to start when media element starts playing. Differential Revision:

/* -*- 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 */

#ifndef MediaElementAudioSourceNode_h_
#define MediaElementAudioSourceNode_h_

#include "MediaStreamAudioSourceNode.h"

namespace mozilla {
namespace dom {

class AudioContext;
struct MediaElementAudioSourceOptions;

class MediaElementAudioSourceNode final : public MediaStreamAudioSourceNode {
  static already_AddRefed<MediaElementAudioSourceNode> Create(
      AudioContext& aAudioContext,
      const MediaElementAudioSourceOptions& aOptions, ErrorResult& aRv);

  static already_AddRefed<MediaElementAudioSourceNode> Constructor(
      const GlobalObject& aGlobal, AudioContext& aAudioContext,
      const MediaElementAudioSourceOptions& aOptions, ErrorResult& aRv) {
    return Create(aAudioContext, aOptions, aRv);

  JSObject* WrapObject(JSContext* aCx,
                       JS::Handle<JSObject*> aGivenProto) override;

  const char* NodeType() const override {
    return "MediaElementAudioSourceNode";

  const char* CrossOriginErrorString() const override {
    return "MediaElementAudioSourceNodeCrossOrigin";

  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);

  explicit MediaElementAudioSourceNode(AudioContext* aContext);

  void Destroy() override;

  // If AudioContext was not allowed to start, we would try to start it when
  // source starts.
  void ListenForAllowedToPlay(const MediaElementAudioSourceOptions& aOptions);

  MozPromiseRequestHolder<GenericNonExclusivePromise> mAllowedToPlayRequest;

}  // namespace dom
}  // namespace mozilla