Media Remoting: Add remoting control logic for encrypted contents.

media/remoting/remoting_controller.h

-// Copyright 2016 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 MEDIA_REMOTING_REMOTING_CONTROLLER_H_
-#define MEDIA_REMOTING_REMOTING_CONTROLLER_H_
-
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-#include "media/base/media_observer.h"
-#include "media/mojo/interfaces/remoting.mojom.h"
-#include "mojo/public/cpp/bindings/binding.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-// This class does the following:
-// 1) Sends/Receives messages from/to Remoter;
-// 2) Monitors player events as a MediaObserver;
-// 3) May trigger the switch of the media renderer between local playback
-// and remoting.
-//
-namespace media {
-
-namespace remoting {
-class RpcBroker;
-}
-
-class RemotingController final : public MediaObserver,
-                                 public mojom::RemotingSource {
- public:
-  RemotingController(mojom::RemotingSourceRequest source_request,
-                     mojom::RemoterPtr remoter);
-  ~RemotingController() override;
-
-  using DataPipeStartCallback =
-      base::Callback<void(mojom::RemotingDataStreamSenderPtrInfo audio,
-                          mojom::RemotingDataStreamSenderPtrInfo video,
-                          mojo::ScopedDataPipeProducerHandle audio_handle,
-                          mojo::ScopedDataPipeProducerHandle video_handle)>;
-  void StartDataPipe(std::unique_ptr<mojo::DataPipe> audio_data_pipe,
-                     std::unique_ptr<mojo::DataPipe> video_data_pipe,
-                     const DataPipeStartCallback& done_callback);
-
-  // RemotingSource implementations.
-  void OnSinkAvailable() override;
-  void OnSinkGone() override;
-  void OnStarted() override;
-  void OnStartFailed(mojom::RemotingStartFailReason reason) override;
-  void OnMessageFromSink(const std::vector<uint8_t>& message) override;
-  void OnStopped(mojom::RemotingStopReason reason) override;
-
-  // MediaObserver implementations.
-  // This is called when the video element or its ancestor enters full screen.
-  // We currently use this as an indicator for immersive playback. May add other
-  // criteria (e.g. the actual display width/height of the video element) in
-  // future.
-  void OnEnteredFullscreen() override;
-  void OnExitedFullscreen() override;
-  void OnSetCdm(CdmContext* cdm_context) override;
-  void OnMetadataChanged(const PipelineMetadata& metadata) override;
-
-  using SwitchRendererCallback = base::Callback<void()>;
-  void SetSwitchRendererCallback(const SwitchRendererCallback& cb);
-
-  // Tells which renderer should be used.
-  bool is_remoting() const {
-    DCHECK(task_runner_->BelongsToCurrentThread());
-    return is_remoting_;
-  }
-
-  base::WeakPtr<RemotingController> GetWeakPtr() {
-    return weak_factory_.GetWeakPtr();
-  }
-
-  base::WeakPtr<remoting::RpcBroker> GetRpcBroker() const;
-
- private:
-  bool IsVideoCodecSupported();
-  bool IsAudioCodecSupported();
-
-  // Helper to decide whether to enter or leave Remoting mode.
-  bool ShouldBeRemoting();
-
-  // Determines whether to enter or leave Remoting mode and switches if
-  // necessary.
-  void UpdateAndMaybeSwitch();
-
-  // Callback from RpcBroker when sending message to remote sink.
-  void OnSendMessageToSink(std::unique_ptr<std::vector<uint8_t>> message);
-
-  // Handle incomging and outgoing RPC message.
-  std::unique_ptr<remoting::RpcBroker> rpc_broker_;
-
-  // Indicates if this media element or its ancestor enters full screen.
-  bool is_fullscreen_ = false;
-
-  // Indicates the remoting sink availablity.
-  bool is_sink_available_ = false;
-
-  // Indicates if remoting is started.
-  bool is_remoting_ = false;
-
-  // Indicates whether audio or video is encrypted.
-  bool is_encrypted_ = false;
-
-  // Current audio/video config.
-  VideoDecoderConfig video_decoder_config_;
-  AudioDecoderConfig audio_decoder_config_;
-  bool has_audio_ = false;
-  bool has_video_ = false;
-
-  // The callback to switch the media renderer.
-  SwitchRendererCallback switch_renderer_cb_;
-
-  mojo::Binding<mojom::RemotingSource> binding_;
-  mojom::RemoterPtr remoter_;
-
-  // TODO(xjz): Add a media thread task runner for the received RPC messages for
-  // remoting media renderer in the up-coming change.
-  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-
-  base::WeakPtrFactory<RemotingController> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(RemotingController);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_REMOTING_REMOTING_CONTROLLER_H_