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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2016-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "BaseAudioContext.h"
#include "DefaultAudioDestinationNode.h"
#include "MediaCanStartListener.h"
#include "MediaProducer.h"
#include "MediaUniqueIdentifier.h"
#include "PlatformMediaSession.h"
#include <wtf/UniqueRef.h>
namespace WebCore {
class LocalDOMWindow;
class HTMLMediaElement;
class MediaStream;
class MediaStreamAudioDestinationNode;
class MediaStreamAudioSourceNode;
struct AudioContextOptions;
struct AudioTimestamp;
class AudioContext final
: public BaseAudioContext
, public MediaProducer
, public MediaCanStartListener
, private PlatformMediaSessionClient {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(AudioContext);
public:
// Create an AudioContext for rendering to the audio hardware.
static ExceptionOr<Ref<AudioContext>> create(Document&, AudioContextOptions&&);
~AudioContext();
void ref() const final { ThreadSafeRefCounted::ref(); }
void deref() const final { ThreadSafeRefCounted::deref(); }
WEBCORE_EXPORT static void setDefaultSampleRateForTesting(std::optional<float>);
void close(DOMPromiseDeferred<void>&&);
DefaultAudioDestinationNode& destination() final { return m_destinationNode.get(); }
const DefaultAudioDestinationNode& destination() const final { return m_destinationNode.get(); }
double baseLatency();
double outputLatency();
AudioTimestamp getOutputTimestamp();
#if ENABLE(VIDEO)
ExceptionOr<Ref<MediaElementAudioSourceNode>> createMediaElementSource(HTMLMediaElement&);
#endif
#if ENABLE(MEDIA_STREAM)
ExceptionOr<Ref<MediaStreamAudioSourceNode>> createMediaStreamSource(MediaStream&);
ExceptionOr<Ref<MediaStreamAudioDestinationNode>> createMediaStreamDestination();
#endif
void suspendRendering(DOMPromiseDeferred<void>&&);
void resumeRendering(DOMPromiseDeferred<void>&&);
void sourceNodeWillBeginPlayback(AudioNode&) final;
void lazyInitialize() final;
void startRendering();
void isPlayingAudioDidChange();
// Restrictions to change default behaviors.
enum BehaviorRestrictionFlags {
NoRestrictions = 0,
RequireUserGestureForAudioStartRestriction = 1 << 0,
RequirePageConsentForAudioStartRestriction = 1 << 1,
};
typedef unsigned BehaviorRestrictions;
BehaviorRestrictions behaviorRestrictions() const { return m_restrictions; }
void addBehaviorRestriction(BehaviorRestrictions restriction) { m_restrictions |= restriction; }
void removeBehaviorRestriction(BehaviorRestrictions restriction) { m_restrictions &= ~restriction; }
void defaultDestinationWillBecomeConnected();
private:
AudioContext(Document&, const AudioContextOptions&);
bool willBeginPlayback();
#if !RELEASE_LOG_DISABLED
const Logger& logger() const final;
uint64_t logIdentifier() const final { return BaseAudioContext::logIdentifier(); }
#endif
void constructCommon();
bool userGestureRequiredForAudioStart() const { return m_restrictions & RequireUserGestureForAudioStartRestriction; }
bool pageConsentRequiredForAudioStart() const { return m_restrictions & RequirePageConsentForAudioStartRestriction; }
bool willPausePlayback();
void uninitialize() final;
bool isOfflineContext() const final { return false; }
// MediaProducer
MediaProducerMediaStateFlags mediaState() const final;
void pageMutedStateDidChange() final;
// PlatformMediaSessionClient
PlatformMediaSession::MediaType mediaType() const final { return isSuspended() || isStopped() ? PlatformMediaSession::MediaType::None : PlatformMediaSession::MediaType::WebAudio; }
PlatformMediaSession::MediaType presentationType() const final { return PlatformMediaSession::MediaType::WebAudio; }
void mayResumePlayback(bool shouldResume) final;
void suspendPlayback() final;
bool canReceiveRemoteControlCommands() const final;
void didReceiveRemoteControlCommand(PlatformMediaSession::RemoteControlCommandType, const PlatformMediaSession::RemoteCommandArgument&) final;
bool supportsSeeking() const final { return false; }
bool shouldOverrideBackgroundPlaybackRestriction(PlatformMediaSession::InterruptionType) const final;
bool canProduceAudio() const final { return true; }
bool isSuspended() const final;
bool isPlaying() const final;
bool isAudible() const final;
std::optional<MediaSessionGroupIdentifier> mediaSessionGroupIdentifier() const final;
bool isNowPlayingEligible() const final;
std::optional<NowPlayingInfo> nowPlayingInfo() const final;
WeakPtr<PlatformMediaSession> selectBestMediaSession(const Vector<WeakPtr<PlatformMediaSession>>&, PlatformMediaSession::PlaybackControlsPurpose) final;
void isActiveNowPlayingSessionChanged() final;
ProcessID presentingApplicationPID() const final;
// MediaCanStartListener.
void mediaCanStart(Document&) final;
// ActiveDOMObject
void suspend(ReasonForSuspension) final;
void resume() final;
bool virtualHasPendingActivity() const final;
UniqueRef<DefaultAudioDestinationNode> m_destinationNode;
std::unique_ptr<PlatformMediaSession> m_mediaSession;
MediaUniqueIdentifier m_currentIdentifier;
BehaviorRestrictions m_restrictions { NoRestrictions };
// [[suspended by user]] flag in the specification:
// https://www.w3.org/TR/webaudio/#dom-audiocontext-suspended-by-user-slot
bool m_wasSuspendedByScript { false };
bool m_canOverrideBackgroundPlaybackRestriction { true };
};
} // WebCore
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::AudioContext)
static bool isType(const WebCore::BaseAudioContext& context) { return !context.isOfflineContext(); }
SPECIALIZE_TYPE_TRAITS_END()
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