dom/media/webaudio/MediaStreamAudioSourceNode.h
author Mike Hommey <mh+mozilla@glandium.org>
Fri, 11 Jan 2019 16:01:15 +0000
changeset 453570 daf50f25895db073e44d50fecf2e4f6fe873865d
parent 453532 c34e287f2f7ca98ad1945804c2a20f61249b36af
child 457646 a04946ac4b3cdcd957b6636dd0212c96c6362e18
permissions -rw-r--r--
Bug 1519307 - Add a new project to build useful parts of breakpad independently. r=froydnj With `ac_add_options --enable-project=tools/crashreporter` in a mozconfig, `./mach build` builds minidump_stackwalk, dump_syms and fileid. One caveat is that due to limitation in how the build system works currently, it's cumbersome to keep dump_syms as a host program for Gecko, and to make it a target program for this project. For now, keep it as a host program. We're not going to use it on automation, but it's still convenient to have for quick local builds (I've had to resort to awful hacks downstream). Differential Revision: https://phabricator.services.mozilla.com/D16299

/* -*- 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/. */

#ifndef MediaStreamAudioSourceNode_h_
#define MediaStreamAudioSourceNode_h_

#include "AudioNode.h"
#include "DOMMediaStream.h"
#include "AudioNodeEngine.h"

namespace mozilla {

namespace dom {

class AudioContext;
struct MediaStreamAudioSourceOptions;

class MediaStreamAudioSourceNodeEngine final : public AudioNodeEngine {
 public:
  explicit MediaStreamAudioSourceNodeEngine(AudioNode* aNode)
      : AudioNodeEngine(aNode), mEnabled(false) {}

  bool IsEnabled() const { return mEnabled; }
  enum Parameters { ENABLE };
  void SetInt32Parameter(uint32_t aIndex, int32_t aValue) override {
    switch (aIndex) {
      case ENABLE:
        mEnabled = !!aValue;
        break;
      default:
        NS_ERROR("MediaStreamAudioSourceNodeEngine bad parameter index");
    }
  }

 private:
  bool mEnabled;
};

class MediaStreamAudioSourceNode
    : public AudioNode,
      public DOMMediaStream::TrackListener,
      public PrincipalChangeObserver<MediaStreamTrack> {
 public:
  static already_AddRefed<MediaStreamAudioSourceNode> Create(
      AudioContext& aContext, const MediaStreamAudioSourceOptions& aOptions,
      ErrorResult& aRv);

  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MediaStreamAudioSourceNode,
                                           AudioNode)

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

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

  void DestroyMediaStream() override;

  uint16_t NumberOfInputs() const override { return 0; }

  const char* NodeType() const override { return "MediaStreamAudioSourceNode"; }

  virtual const char* CrossOriginErrorString() const {
    return "MediaStreamAudioSourceNodeCrossOrigin";
  }

  size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override;
  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override;

  // Attaches to aTrack so that its audio content will be used as input.
  void AttachToTrack(const RefPtr<MediaStreamTrack>& aTrack);

  // Detaches from the currently attached track if there is one.
  void DetachFromTrack();

  // Attaches to the first available audio track in aMediaStream.
  void AttachToFirstTrack(const RefPtr<DOMMediaStream>& aMediaStream);

  // From DOMMediaStream::TrackListener.
  void NotifyTrackAdded(const RefPtr<MediaStreamTrack>& aTrack) override;
  void NotifyTrackRemoved(const RefPtr<MediaStreamTrack>& aTrack) override;

  // From PrincipalChangeObserver<MediaStreamTrack>.
  void PrincipalChanged(MediaStreamTrack* aMediaStreamTrack) override;

 protected:
  explicit MediaStreamAudioSourceNode(AudioContext* aContext);
  void Init(DOMMediaStream* aMediaStream, ErrorResult& aRv);
  virtual void Destroy();
  virtual ~MediaStreamAudioSourceNode();

 private:
  RefPtr<MediaInputPort> mInputPort;
  RefPtr<DOMMediaStream> mInputStream;

  // On construction we set this to the first audio track of mInputStream.
  RefPtr<MediaStreamTrack> mInputTrack;
};

}  // namespace dom
}  // namespace mozilla

#endif