dom/media/webaudio/AudioDestinationNode.h
author Mike Hommey <mh+mozilla@glandium.org>
Fri, 11 Jan 2019 16:01:15 +0000
changeset 453570 daf50f25895db073e44d50fecf2e4f6fe873865d
parent 446960 0ceae9db9ec0be18daa1a279511ad305723185d4
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 AudioDestinationNode_h_
#define AudioDestinationNode_h_

#include "AudioChannelService.h"
#include "AudioNode.h"
#include "nsIAudioChannelAgent.h"
#include "mozilla/TimeStamp.h"

namespace mozilla {
namespace dom {

class AudioContext;

class AudioDestinationNode final : public AudioNode,
                                   public nsIAudioChannelAgentCallback,
                                   public MainThreadMediaStreamListener {
 public:
  // This node type knows what MediaStreamGraph to use based on
  // whether it's in offline mode.
  AudioDestinationNode(AudioContext* aContext, bool aIsOffline,
                       bool aAllowedToStart, uint32_t aNumberOfChannels,
                       uint32_t aLength);

  void DestroyMediaStream() override;

  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AudioDestinationNode, AudioNode)
  NS_DECL_NSIAUDIOCHANNELAGENTCALLBACK

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

  uint16_t NumberOfOutputs() const final { return 0; }

  uint32_t MaxChannelCount() const;
  void SetChannelCount(uint32_t aChannelCount, ErrorResult& aRv) override;

  // Returns the stream or null after unlink.
  AudioNodeStream* Stream();

  void Mute();
  void Unmute();

  void Suspend();
  void Resume();

  void StartRendering(Promise* aPromise);

  void OfflineShutdown();

  void NotifyMainThreadStreamFinished() override;
  void FireOfflineCompletionEvent();

  nsresult CreateAudioChannelAgent();
  void DestroyAudioChannelAgent();

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

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

  void NotifyAudibleStateChanged(bool aAudible);
  void ResolvePromise(AudioBuffer* aRenderedBuffer);

  unsigned long Length() {
    MOZ_ASSERT(mIsOffline);
    return mFramesToProduce;
  }

 protected:
  virtual ~AudioDestinationNode();

 private:
  SelfReference<AudioDestinationNode> mOfflineRenderingRef;
  uint32_t mFramesToProduce;

  nsCOMPtr<nsIAudioChannelAgent> mAudioChannelAgent;
  RefPtr<MediaInputPort> mCaptureStreamPort;

  RefPtr<Promise> mOfflineRenderingPromise;

  bool mIsOffline;
  bool mAudioChannelSuspended;

  bool mCaptured;
  AudioChannelService::AudibleState mAudible;

  // These varaibles are used to know how long AudioContext would become audible
  // since it was created.
  TimeStamp mCreatedTime;
  TimeDuration mDurationBeforeFirstTimeAudible;
};

}  // namespace dom
}  // namespace mozilla

#endif