third_party/WebKit/Source/modules/mediasource/MediaSource.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef MediaSource_h
#define MediaSource_h

#include <memory>
#include "bindings/core/v8/ActiveScriptWrappable.h"
#include "core/dom/ContextLifecycleObserver.h"
#include "core/dom/ExceptionCode.h"
#include "core/fileapi/URLRegistry.h"
#include "core/html/TimeRanges.h"
#include "core/html/media/HTMLMediaSource.h"
#include "modules/EventTargetModules.h"
#include "modules/mediasource/SourceBuffer.h"
#include "modules/mediasource/SourceBufferList.h"
#include "public/platform/WebMediaSource.h"

namespace blink {

class ExceptionState;
class MediaElementEventQueue;
class WebSourceBuffer;

class MediaSource final : public EventTargetWithInlineData,
                          public HTMLMediaSource,
                          public ActiveScriptWrappable<MediaSource>,
                          public ContextLifecycleObserver {
  DEFINE_WRAPPERTYPEINFO();
  USING_GARBAGE_COLLECTED_MIXIN(MediaSource);

 public:
  static const AtomicString& OpenKeyword();
  static const AtomicString& ClosedKeyword();
  static const AtomicString& EndedKeyword();

  static MediaSource* Create(ExecutionContext*);
  ~MediaSource() override;

  static void LogAndThrowDOMException(ExceptionState&,
                                      ExceptionCode error,
                                      const String& message);
  static void LogAndThrowTypeError(ExceptionState&, const String&);

  // MediaSource.idl methods
  SourceBufferList* sourceBuffers() { return source_buffers_.Get(); }
  SourceBufferList* activeSourceBuffers() {
    return active_source_buffers_.Get();
  }
  SourceBuffer* addSourceBuffer(const String& type, ExceptionState&);
  void removeSourceBuffer(SourceBuffer*, ExceptionState&);
  void setDuration(double, ExceptionState&);

  DEFINE_ATTRIBUTE_EVENT_LISTENER(sourceopen);
  DEFINE_ATTRIBUTE_EVENT_LISTENER(sourceended);
  DEFINE_ATTRIBUTE_EVENT_LISTENER(sourceclose);

  const AtomicString& readyState() const { return ready_state_; }
  void endOfStream(const AtomicString& error, ExceptionState&);
  void endOfStream(ExceptionState&);
  void setLiveSeekableRange(double start, double end, ExceptionState&);
  void clearLiveSeekableRange(ExceptionState&);

  static bool isTypeSupported(const String& type);

  // HTMLMediaSource
  bool AttachToElement(HTMLMediaElement*) override;
  void SetWebMediaSourceAndOpen(std::unique_ptr<WebMediaSource>) override;
  void Close() override;
  bool IsClosed() const override;
  double duration() const override;
  TimeRanges* Buffered() const override;
  TimeRanges* Seekable() const override;
  void OnTrackChanged(TrackBase*) override;

  // EventTarget interface
  const AtomicString& InterfaceName() const override;
  ExecutionContext* GetExecutionContext() const override;

  // ScriptWrappable
  bool HasPendingActivity() const final;

  // ContextLifecycleObserver interface
  void ContextDestroyed(ExecutionContext*) override;

  // URLRegistrable interface
  URLRegistry& Registry() const override;

  // Used by SourceBuffer.
  void OpenIfInEndedState();
  bool IsOpen() const;
  void SetSourceBufferActive(SourceBuffer*, bool);
  HTMLMediaElement* MediaElement() const;
  void EndOfStreamAlgorithm(const WebMediaSource::EndOfStreamStatus);

  // Used by MediaSourceRegistry.
  void AddedToRegistry();
  void RemovedFromRegistry();

  virtual void Trace(blink::Visitor*);

 private:
  explicit MediaSource(ExecutionContext*);

  void SetReadyState(const AtomicString&);
  void OnReadyStateChange(const AtomicString&, const AtomicString&);

  bool IsUpdating() const;

  std::unique_ptr<WebSourceBuffer> CreateWebSourceBuffer(const String& type,
                                                         const String& codecs,
                                                         ExceptionState&);
  void ScheduleEvent(const AtomicString& event_name);

  // Implements the duration change algorithm.
  // http://w3c.github.io/media-source/#duration-change-algorithm
  void DurationChangeAlgorithm(double new_duration, ExceptionState&);

  std::unique_ptr<WebMediaSource> web_media_source_;
  AtomicString ready_state_;
  Member<MediaElementEventQueue> async_event_queue_;
  WeakMember<HTMLMediaElement> attached_element_;

  Member<SourceBufferList> source_buffers_;
  Member<SourceBufferList> active_source_buffers_;

  Member<TimeRanges> live_seekable_range_;

  int added_to_registry_counter_;
};

}  // namespace blink

#endif  // MediaSource_h