cef/include/cef_media_router.h

// Copyright (c) 2020 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
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// ---------------------------------------------------------------------------
//
// The contents of this file must follow a specific format in order to
// support the CEF translator tool. See the translator.README.txt file in the
// tools directory for more information.
//

#ifndef CEF_INCLUDE_CEF_MEDIA_ROUTER_H_
#define CEF_INCLUDE_CEF_MEDIA_ROUTER_H_
#pragma once

#include <vector>
#include "include/cef_base.h"
#include "include/cef_registration.h"

class CefMediaObserver;
class CefMediaRoute;
class CefMediaRouteCreateCallback;
class CefMediaSink;
class CefMediaSource;

///
// Supports discovery of and communication with media devices on the local
// network via the Cast and DIAL protocols. The methods of this class may be
// called on any browser process thread unless otherwise indicated.
///
/*--cef(source=library)--*/
class CefMediaRouter : public virtual CefBaseRefCounted {
 public:
  ///
  // Returns the MediaRouter object associated with the global request context.
  // Equivalent to calling
  // CefRequestContext::GetGlobalContext()->GetMediaRouter().
  ///
  /*--cef()--*/
  static CefRefPtr<CefMediaRouter> GetGlobalMediaRouter();

  ///
  // Add an observer for MediaRouter events. The observer will remain registered
  // until the returned Registration object is destroyed.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefRegistration> AddObserver(
      CefRefPtr<CefMediaObserver> observer) = 0;

  ///
  // Returns a MediaSource object for the specified media source URN. Supported
  // URN schemes include "cast:" and "dial:", and will be already known by the
  // client application (e.g. "cast:<appId>?clientId=<clientId>").
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefMediaSource> GetSource(const CefString& urn) = 0;

  ///
  // Trigger an asynchronous call to CefMediaObserver::OnSinks on all
  // registered observers.
  ///
  /*--cef()--*/
  virtual void NotifyCurrentSinks() = 0;

  ///
  // Create a new route between |source| and |sink|. Source and sink must be
  // valid, compatible (as reported by CefMediaSink::IsCompatibleWith), and a
  // route between them must not already exist. |callback| will be executed
  // on success or failure. If route creation succeeds it will also trigger an
  // asynchronous call to CefMediaObserver::OnRoutes on all registered
  // observers.
  ///
  /*--cef()--*/
  virtual void CreateRoute(CefRefPtr<CefMediaSource> source,
                           CefRefPtr<CefMediaSink> sink,
                           CefRefPtr<CefMediaRouteCreateCallback> callback) = 0;

  ///
  // Trigger an asynchronous call to CefMediaObserver::OnRoutes on all
  // registered observers.
  ///
  /*--cef()--*/
  virtual void NotifyCurrentRoutes() = 0;
};

///
// Implemented by the client to observe MediaRouter events and registered via
// CefMediaRouter::AddObserver. The methods of this class will be called on the
// browser process UI thread.
///
/*--cef(source=client)--*/
class CefMediaObserver : public virtual CefBaseRefCounted {
 public:
  typedef cef_media_route_connection_state_t ConnectionState;

  ///
  // The list of available media sinks has changed or
  // CefMediaRouter::NotifyCurrentSinks was called.
  ///
  /*--cef()--*/
  virtual void OnSinks(const std::vector<CefRefPtr<CefMediaSink>>& sinks) = 0;

  ///
  // The list of available media routes has changed or
  // CefMediaRouter::NotifyCurrentRoutes was called.
  ///
  /*--cef()--*/
  virtual void OnRoutes(
      const std::vector<CefRefPtr<CefMediaRoute>>& routes) = 0;

  ///
  // The connection state of |route| has changed.
  ///
  /*--cef()--*/
  virtual void OnRouteStateChanged(CefRefPtr<CefMediaRoute> route,
                                   ConnectionState state) = 0;

  ///
  // A message was recieved over |route|. |message| is only valid for
  // the scope of this callback and should be copied if necessary.
  ///
  /*--cef()--*/
  virtual void OnRouteMessageReceived(CefRefPtr<CefMediaRoute> route,
                                      const void* message,
                                      size_t message_size) = 0;
};

///
// Represents the route between a media source and sink. Instances of this
// object are created via CefMediaRouter::CreateRoute and retrieved via
// CefMediaObserver::OnRoutes. Contains the status and metadata of a
// routing operation. The methods of this class may be called on any browser
// process thread unless otherwise indicated.
///
/*--cef(source=library)--*/
class CefMediaRoute : public virtual CefBaseRefCounted {
 public:
  ///
  // Returns the ID for this route.
  ///
  /*--cef()--*/
  virtual CefString GetId() = 0;

  ///
  // Returns the source associated with this route.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefMediaSource> GetSource() = 0;

  ///
  // Returns the sink associated with this route.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefMediaSink> GetSink() = 0;

  ///
  // Send a message over this route. |message| will be copied if necessary.
  ///
  /*--cef()--*/
  virtual void SendRouteMessage(const void* message, size_t message_size) = 0;

  ///
  // Terminate this route. Will result in an asynchronous call to
  // CefMediaObserver::OnRoutes on all registered observers.
  ///
  /*--cef()--*/
  virtual void Terminate() = 0;
};

///
// Callback interface for CefMediaRouter::CreateRoute. The methods of this
// class will be called on the browser process UI thread.
///
/*--cef(source=client)--*/
class CefMediaRouteCreateCallback : public virtual CefBaseRefCounted {
 public:
  typedef cef_media_route_create_result_t RouteCreateResult;

  ///
  // Method that will be executed when the route creation has finished. |result|
  // will be CEF_MRCR_OK if the route creation succeeded. |error| will be a
  // description of the error if the route creation failed. |route| is the
  // resulting route, or empty if the route creation failed.
  ///
  /*--cef(optional_param=error,optional_param=route)--*/
  virtual void OnMediaRouteCreateFinished(RouteCreateResult result,
                                          const CefString& error,
                                          CefRefPtr<CefMediaRoute> route) = 0;
};

///
// Represents a sink to which media can be routed. Instances of this object are
// retrieved via CefMediaObserver::OnSinks. The methods of this class may
// be called on any browser process thread unless otherwise indicated.
///
/*--cef(source=library)--*/
class CefMediaSink : public virtual CefBaseRefCounted {
 public:
  ///
  // Returns the ID for this sink.
  ///
  /*--cef()--*/
  virtual CefString GetId() = 0;

  ///
  // Returns true if this sink is valid.
  ///
  /*--cef()--*/
  virtual bool IsValid() = 0;

  ///
  // Returns the name of this sink.
  ///
  /*--cef()--*/
  virtual CefString GetName() = 0;

  ///
  // Returns the description of this sink.
  ///
  /*--cef()--*/
  virtual CefString GetDescription() = 0;

  ///
  // Returns true if this sink accepts content via Cast.
  ///
  /*--cef()--*/
  virtual bool IsCastSink() = 0;

  ///
  // Returns true if this sink accepts content via DIAL.
  ///
  /*--cef()--*/
  virtual bool IsDialSink() = 0;

  ///
  // Returns true if this sink is compatible with |source|.
  ///
  /*--cef()--*/
  virtual bool IsCompatibleWith(CefRefPtr<CefMediaSource> source) = 0;
};

///
// Represents a source from which media can be routed. Instances of this object
// are retrieved via CefMediaRouter::GetSource. The methods of this class may be
// called on any browser process thread unless otherwise indicated.
///
/*--cef(source=library)--*/
class CefMediaSource : public virtual CefBaseRefCounted {
 public:
  ///
  // Returns the ID (media source URN or URL) for this source.
  ///
  /*--cef()--*/
  virtual CefString GetId() = 0;

  ///
  // Returns true if this source is valid.
  ///
  /*--cef()--*/
  virtual bool IsValid() = 0;

  ///
  // Returns true if this source outputs its content via Cast.
  ///
  /*--cef()--*/
  virtual bool IsCastSource() = 0;

  ///
  // Returns true if this source outputs its content via DIAL.
  ///
  /*--cef()--*/
  virtual bool IsDialSource() = 0;
};

#endif  // CEF_INCLUDE_CEF_MEDIA_ROUTER_H_