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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2011 Ericsson AB. 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_MEDIA_STREAM_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_MEDIA_STREAM_H_
#include "third_party/blink/renderer/bindings/core/v8/active_script_wrappable.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/modules/event_target_modules.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_track.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_set.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_descriptor.h"
#include "third_party/blink/renderer/platform/timer.h"
namespace blink {
class ExceptionState;
class ExecutionContext;
class ScriptState;
class TransferredMediaStreamTrack;
class MODULES_EXPORT MediaStreamObserver : public GarbageCollectedMixin {
public:
virtual ~MediaStreamObserver() = default;
// Invoked when |MediaStream::addTrack| is called.
virtual void OnStreamAddTrack(MediaStream*,
MediaStreamTrack*,
ExceptionState& exception_state) = 0;
// Invoked when |MediaStream::removeTrack| is called.
virtual void OnStreamRemoveTrack(MediaStream*,
MediaStreamTrack*,
ExceptionState& exception_state) = 0;
void Trace(Visitor* visitor) const override {}
};
class MODULES_EXPORT MediaStream final
: public EventTarget,
public ExecutionContextClient,
public ActiveScriptWrappable<MediaStream>,
public MediaStreamDescriptorClient {
DEFINE_WRAPPERTYPEINFO();
public:
static MediaStream* Create(ExecutionContext*);
static MediaStream* Create(ExecutionContext*, MediaStream*);
static MediaStream* Create(ExecutionContext*, const MediaStreamTrackVector&);
// Creates a MediaStream matching the MediaStreamDescriptor. MediaStreamTracks
// are created for any MediaStreamComponents attached to the descriptor.
static MediaStream* Create(ExecutionContext*, MediaStreamDescriptor*);
// Creates a MediaStream matching the MediaStreamDescriptor. MediaStreamTracks
// are created for any MediaStreamComponents attached to the descriptor. If
// TransferredMediaStreamTrack != nullptr, exactly one track is expected in
// the MediaStreamDescriptor, and the created track will be used as the
// underlying implementation of this track. The stream is returned via
// callback.
static void Create(ExecutionContext*,
MediaStreamDescriptor*,
TransferredMediaStreamTrack*,
base::OnceCallback<void(MediaStream*)> callback);
// Creates a MediaStream with the specified MediaStreamDescriptor and
// MediaStreamTracks. The tracks must match the MediaStreamComponents attached
// to the descriptor (or else a DCHECK fails). This allows you to create
// multiple streams from descriptors containing the same components without
// creating duplicate MediaStreamTracks for those components, provided the
// caller knows about existing tracks.
// This is motivated by WebRTC, where remote streams can be created for tracks
// that already exist in Blink (e.g. multiple remote streams containing the
// same track).
static MediaStream* Create(ExecutionContext*,
MediaStreamDescriptor*,
const MediaStreamTrackVector& audio_tracks,
const MediaStreamTrackVector& video_tracks);
MediaStream(ExecutionContext*,
MediaStreamDescriptor*,
TransferredMediaStreamTrack*,
base::OnceCallback<void(MediaStream*)> callback);
MediaStream(ExecutionContext*,
MediaStreamDescriptor*,
const MediaStreamTrackVector& audio_tracks,
const MediaStreamTrackVector& video_tracks);
MediaStream(ExecutionContext*,
const MediaStreamTrackVector& audio_tracks,
const MediaStreamTrackVector& video_tracks);
~MediaStream() override;
String id() const { return descriptor_->Id(); }
// Adds the track, this may cause "onactive" to fire but it won't cause
// "onaddtrack" because the track was added explicitly by the JavaScript
// application.
void addTrack(MediaStreamTrack*, ExceptionState&);
void removeTrack(MediaStreamTrack*, ExceptionState&);
MediaStreamTrack* getTrackById(String);
MediaStream* clone(ScriptState*);
MediaStreamTrackVector getAudioTracks() const { return audio_tracks_; }
MediaStreamTrackVector getVideoTracks() const { return video_tracks_; }
MediaStreamTrackVector getTracks();
bool active() const { return descriptor_->Active(); }
DEFINE_ATTRIBUTE_EVENT_LISTENER(active, kActive)
DEFINE_ATTRIBUTE_EVENT_LISTENER(inactive, kInactive)
DEFINE_ATTRIBUTE_EVENT_LISTENER(addtrack, kAddtrack)
DEFINE_ATTRIBUTE_EVENT_LISTENER(removetrack, kRemovetrack)
void TrackEnded();
void RegisterObserver(MediaStreamObserver*);
void UnregisterObserver(MediaStreamObserver*);
void StreamEnded();
void NotifyEnabledStateChangeForWebRtcAudio(bool enabled);
// MediaStreamDescriptorClient implementation
void AddTrackByComponentAndFireEvents(MediaStreamComponent*,
DispatchEventTiming) override;
void RemoveTrackByComponentAndFireEvents(MediaStreamComponent*,
DispatchEventTiming) override;
// Adds the track and, unlike JavaScript-invoked addTrack(), fires related
// events like "onaddtrack" either synchronously or in a scheduled event.
void AddTrackAndFireEvents(MediaStreamTrack*, DispatchEventTiming);
void RemoveTrackAndFireEvents(MediaStreamTrack*, DispatchEventTiming);
void AddRemoteTrack(MediaStreamTrack*);
void RemoveRemoteTrack(MediaStreamTrack*);
MediaStreamDescriptor* Descriptor() const { return descriptor_.Get(); }
// EventTarget
const AtomicString& InterfaceName() const override;
ExecutionContext* GetExecutionContext() const override {
return ExecutionContextClient::GetExecutionContext();
}
// ActiveScriptWrappable
bool HasPendingActivity() const override;
void Trace(Visitor*) const override;
protected:
bool AddEventListenerInternal(
const AtomicString& event_type,
EventListener*,
const AddEventListenerOptionsResolved*) override;
private:
bool EmptyOrOnlyEndedTracks();
bool TracksMatchDescriptor();
void ScheduleDispatchEvent(Event*);
void ScheduledEventTimerFired(TimerBase*);
void OnMediaStreamTrackInitialized();
MediaStreamTrackVector audio_tracks_;
MediaStreamTrackVector video_tracks_;
Member<MediaStreamDescriptor> descriptor_;
// Observers are informed when |addTrack| and |removeTrack| are called.
HeapHashSet<WeakMember<MediaStreamObserver>> observers_;
// The callback to be called when the media stream is fully initialized,
// including image capture for video tracks.
base::OnceCallback<void(MediaStream*)> media_stream_initialized_callback_;
HeapTaskRunnerTimer<MediaStream> scheduled_event_timer_;
HeapVector<Member<Event>> scheduled_events_;
uint32_t number_of_video_tracks_initialized_ = 0;
};
using MediaStreamVector = HeapVector<Member<MediaStream>>;
MediaStream* ToMediaStream(MediaStreamDescriptor*);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_MEDIA_STREAM_H_
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