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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SAME_THREAD_MEDIA_SOURCE_ATTACHMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SAME_THREAD_MEDIA_SOURCE_ATTACHMENT_H_
#include <memory>
#include "base/util/type_safety/pass_key.h"
#include "third_party/blink/public/platform/web_time_range.h"
#include "third_party/blink/renderer/core/html/track/audio_track.h"
#include "third_party/blink/renderer/core/html/track/audio_track_list.h"
#include "third_party/blink/renderer/core/html/track/video_track.h"
#include "third_party/blink/renderer/core/html/track/video_track_list.h"
#include "third_party/blink/renderer/modules/mediasource/media_source.h"
#include "third_party/blink/renderer/modules/mediasource/media_source_attachment_supplement.h"
#include "third_party/blink/renderer/modules/mediasource/url_media_source.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
namespace blink {
// Concrete attachment that supports operation only on the main thread.
class SameThreadMediaSourceAttachment final
: public MediaSourceAttachmentSupplement {
public:
// The only intended caller of this constructor is
// URLMediaSource::createObjectUrl, made more clear by using the PassKey. The
// raw pointer is then adopted into a scoped_refptr in
// MediaSourceRegistryImpl::RegisterURL.
SameThreadMediaSourceAttachment(MediaSource* media_source,
util::PassKey<URLMediaSource>);
// MediaSourceAttachmentSupplement
void NotifyDurationChanged(MediaSourceTracer* tracer, double duration) final;
double GetRecentMediaTime(MediaSourceTracer* tracer) final;
bool GetElementError(MediaSourceTracer* tracer) final;
AudioTrackList* CreateAudioTrackList(MediaSourceTracer* tracer) final;
VideoTrackList* CreateVideoTrackList(MediaSourceTracer* tracer) final;
void AddAudioTrackToMediaElement(MediaSourceTracer* tracer,
AudioTrack* track) final;
void AddVideoTrackToMediaElement(MediaSourceTracer* tracer,
VideoTrack* track) final;
void RemoveAudioTracksFromMediaElement(MediaSourceTracer* tracer,
Vector<String> audio_ids,
bool enqueue_change_event) final;
void RemoveVideoTracksFromMediaElement(MediaSourceTracer* tracer,
Vector<String> video_ids,
bool enqueue_change_event) final;
void OnMediaSourceContextDestroyed() final;
// MediaSourceAttachment
void Unregister() final;
MediaSourceTracer* StartAttachingToMediaElement(HTMLMediaElement*,
bool* success) final;
void CompleteAttachingToMediaElement(MediaSourceTracer* tracer,
std::unique_ptr<WebMediaSource>) final;
void Close(MediaSourceTracer* tracer) final;
WebTimeRanges BufferedInternal(MediaSourceTracer* tracer) const final;
WebTimeRanges SeekableInternal(MediaSourceTracer* tracer) const final;
void OnTrackChanged(MediaSourceTracer* tracer, TrackBase*) final;
void OnElementTimeUpdate(double time) final;
void OnElementError() final;
void OnElementContextDestroyed() final;
private:
~SameThreadMediaSourceAttachment() override;
// In this same thread implementation, if the media element context is
// destroyed, then so should be the Media Source's context. This method
// this precondition in debug mode.
void VerifyCalledWhileContextsAliveForDebugging() const;
// Cache of the registered MediaSource. Retains strong reference from
// construction of this object until Unregister() is called.
Persistent<MediaSource> registered_media_source_;
// These are mostly used to verify correct behavior of the media element and
// media source state pumping in debug builds. In a cross-thread attachment
// implementation, state like this will be relied upon for servicing the
// MediaSource API.
double recent_element_time_; // See OnElementTimeUpdate().
bool element_has_error_; // See OnElementError().
bool element_context_destroyed_; // See OnElementContextDestroyed().
bool media_source_context_destroyed_; // See OnMediaSourceContextDestroyed().
DISALLOW_COPY_AND_ASSIGN(SameThreadMediaSourceAttachment);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SAME_THREAD_MEDIA_SOURCE_ATTACHMENT_H_
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