[Chromoting] Refactoring DesktopEnvironment and moving screen/audio recorders to ClientSession.

remoting/host/client_session.cc

 // Copyright (c) 2012 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.
 
 #include "remoting/host/client_session.h"
 
 #include <algorithm>
 
 #include "base/message_loop_proxy.h"
+#include "remoting/base/encoder.h"
+#include "remoting/base/encoder_row_based.h"
+#include "remoting/base/encoder_vp8.h"
+#include "remoting/codec/audio_encoder.h"
+#include "remoting/codec/audio_encoder_verbatim.h"
+#include "remoting/host/audio_capturer.h"
+#include "remoting/host/audio_scheduler.h"
+#include "remoting/host/desktop_environment.h"
+#include "remoting/host/event_executor.h"
+#include "remoting/host/screen_recorder.h"
 #include "remoting/host/video_frame_capturer.h"
 #include "remoting/proto/control.pb.h"
 #include "remoting/proto/event.pb.h"
 #include "remoting/protocol/client_stub.h"
 #include "remoting/protocol/clipboard_thread_proxy.h"
 
 namespace remoting {
 
 ClientSession::ClientSession(
     EventHandler* event_handler,
+    scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
     scoped_ptr<protocol::ConnectionToClient> connection,
-    protocol::ClipboardStub* host_clipboard_stub,
-    protocol::InputStub* host_input_stub,
-    VideoFrameCapturer* capturer,
+    scoped_ptr<DesktopEnvironment> desktop_environment,
     const base::TimeDelta& max_duration)
     : event_handler_(event_handler),
       connection_(connection.Pass()),
+      desktop_environment_(desktop_environment.Pass()),
       client_jid_(connection_->session()->jid()),
       is_authenticated_(false),
-      host_clipboard_stub_(host_clipboard_stub),
-      host_input_stub_(host_input_stub),
+      host_clipboard_stub_(desktop_environment_->event_executor()),
+      host_input_stub_(desktop_environment_->event_executor()),
       input_tracker_(host_input_stub_),
       remote_input_filter_(&input_tracker_),
       mouse_input_filter_(&remote_input_filter_),
       client_clipboard_factory_(clipboard_echo_filter_.client_filter()),
-      capturer_(capturer),
-      max_duration_(max_duration) {
+      capturer_(desktop_environment_->video_capturer()),
+      max_duration_(max_duration),
+      capture_task_runner_(capture_task_runner),
+      encode_task_runner_(encode_task_runner),
+      network_task_runner_(network_task_runner),
+      active_recorders_(0) {
   connection_->SetEventHandler(this);
 
   // TODO(sergeyu): Currently ConnectionToClient expects stubs to be
   // set before channels are connected. Make it possible to set stubs
   // later and set them only when connection is authenticated.
   connection_->set_clipboard_stub(&auth_clipboard_filter_);
   connection_->set_host_stub(this);
   connection_->set_input_stub(this);
   clipboard_echo_filter_.set_host_stub(host_clipboard_stub_);
 }
 
 ClientSession::~ClientSession() {
+  DCHECK(desktop_environment_.get() == NULL);
 }
 
 void ClientSession::InjectKeyEvent(const protocol::KeyEvent& event) {
   DCHECK(CalledOnValidThread());
   auth_input_filter_.InjectKeyEvent(event);
 }
 
 void ClientSession::InjectMouseEvent(const protocol::MouseEvent& event) {
   DCHECK(CalledOnValidThread());
 
@@ skipping 41 matching lines @@
   }
 
   event_handler_->OnSessionAuthenticated(this);
 }
 
 void ClientSession::OnConnectionChannelsConnected(
     protocol::ConnectionToClient* connection) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(connection_.get(), connection);
   SetDisableInputs(false);
+
+  // Then we create a ScreenRecorder passing the message loops that

[Wez, 2012/08/31 18:18:02]

nit: Drop "Then we".

[alexeypa (please no reviews), 2012/08/31 23:13:30]

Done.

+  // it should run on.
+  Encoder* encoder = CreateEncoder(connection_->session()->config());
+  video_recorder_ = new ScreenRecorder(
+      capture_task_runner_,
+      encode_task_runner_,
+      network_task_runner_,
+      desktop_environment_->video_capturer(),
+      encoder);
+  ++active_recorders_;
+
+  if (connection_->session()->config().is_audio_enabled()) {
+    scoped_ptr<AudioEncoder> audio_encoder =
+        CreateAudioEncoder(connection_->session()->config());
+    audio_scheduler_ = new AudioScheduler(
+        capture_task_runner_,
+        network_task_runner_,
+        desktop_environment_->audio_capturer(),
+        audio_encoder.Pass(),
+        connection_->audio_stub());
+    ++active_recorders_;
+  }
+
+  // Immediately add the connection and start the session.

[Wez, 2012/08/31 18:18:02]

nit: Suggest just "Start the session."

[alexeypa (please no reviews), 2012/08/31 23:13:30]

Done.

+  video_recorder_->AddConnection(connection_.get());
+  video_recorder_->Start();
+  desktop_environment_->Start(CreateClipboardProxy());
+
   event_handler_->OnSessionChannelsConnected(this);
 }
 
 void ClientSession::OnConnectionClosed(
     protocol::ConnectionToClient* connection,
     protocol::ErrorCode error) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(connection_.get(), connection);
   if (!is_authenticated_)
     event_handler_->OnSessionAuthenticationFailed(this);
   auth_input_filter_.set_input_stub(NULL);
   auth_clipboard_filter_.set_clipboard_stub(NULL);
 
   // Ensure that any pressed keys or buttons are released.
   input_tracker_.ReleaseAll();
 
   // TODO(sergeyu): Log failure reason?
   event_handler_->OnSessionClosed(this);
 }
 
 void ClientSession::OnSequenceNumberUpdated(
     protocol::ConnectionToClient* connection, int64 sequence_number) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(connection_.get(), connection);
+
+  if (video_recorder_.get())
+    video_recorder_->UpdateSequenceNumber(sequence_number);
+
   event_handler_->OnSessionSequenceNumber(this, sequence_number);
 }
 
 void ClientSession::OnRouteChange(
     protocol::ConnectionToClient* connection,
     const std::string& channel_name,
     const protocol::TransportRoute& route) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(connection_.get(), connection);
   event_handler_->OnSessionRouteChange(this, channel_name, route);
 }
 
 void ClientSession::Disconnect() {
   DCHECK(CalledOnValidThread());
   DCHECK(connection_.get());
 
   max_duration_timer_.Stop();
   // This triggers OnConnectionClosed(), and the session may be destroyed
   // as the result, so this call must be the last in this method.
   connection_->Disconnect();
 }
 
+void ClientSession::StopAndDelete() {
+  DCHECK(CalledOnValidThread());
+
+  if (audio_scheduler_.get()) {
+    audio_scheduler_->OnClientDisconnected();
+    StopAudioScheduler();
+  }
+
+  if (video_recorder_.get()) {
+    video_recorder_->RemoveConnection(connection_.get());
+    StopScreenRecorder();
+  }
+
+  if (!active_recorders_) {
+    desktop_environment_.release()->StopAndDelete();
+    delete this;
+  }
+}
+
 void ClientSession::LocalMouseMoved(const SkIPoint& mouse_pos) {
   DCHECK(CalledOnValidThread());
   remote_input_filter_.LocalMouseMoved(mouse_pos);
 }
 
 void ClientSession::SetDisableInputs(bool disable_inputs) {
   DCHECK(CalledOnValidThread());
 
   if (disable_inputs) {
     disable_input_filter_.set_input_stub(NULL);
     disable_clipboard_filter_.set_clipboard_stub(NULL);
     input_tracker_.ReleaseAll();
   } else {
     disable_input_filter_.set_input_stub(&mouse_input_filter_);
     disable_clipboard_filter_.set_clipboard_stub(
         clipboard_echo_filter_.host_filter());
   }
 }
 
 scoped_ptr<protocol::ClipboardStub> ClientSession::CreateClipboardProxy() {
   DCHECK(CalledOnValidThread());
 
   return scoped_ptr<protocol::ClipboardStub>(
       new protocol::ClipboardThreadProxy(
           client_clipboard_factory_.GetWeakPtr(),
           base::MessageLoopProxy::current()));
 }
 
+// TODO(sergeyu): Move this to SessionManager?
+// static
+Encoder* ClientSession::CreateEncoder(const protocol::SessionConfig& config) {
+  const protocol::ChannelConfig& video_config = config.video_config();
+
+  if (video_config.codec == protocol::ChannelConfig::CODEC_VERBATIM) {
+    return EncoderRowBased::CreateVerbatimEncoder();
+  } else if (video_config.codec == protocol::ChannelConfig::CODEC_ZIP) {
+    return EncoderRowBased::CreateZlibEncoder();
+  } else if (video_config.codec == protocol::ChannelConfig::CODEC_VP8) {
+    return new remoting::EncoderVp8();
+  }
+
+  return NULL;
+}
+
+// static
+scoped_ptr<AudioEncoder> ClientSession::CreateAudioEncoder(
+    const protocol::SessionConfig& config) {
+  const protocol::ChannelConfig& audio_config = config.audio_config();
+
+  if (audio_config.codec == protocol::ChannelConfig::CODEC_VERBATIM) {
+    return scoped_ptr<AudioEncoder>(new AudioEncoderVerbatim());
+  }
+
+  NOTIMPLEMENTED();
+  return scoped_ptr<AudioEncoder>(NULL);
+}
+
+void ClientSession::OnRecorderStopped() {
+  if (!network_task_runner_->BelongsToCurrentThread()) {
+    network_task_runner_->PostTask(
+        FROM_HERE, base::Bind(&ClientSession::OnRecorderStopped,
+        base::Unretained(this)));
+    return;
+  }
+
+  --active_recorders_;
+  DCHECK_GE(active_recorders_, 0);
+
+  StopAndDelete();
+}
+
+void ClientSession::StopAudioScheduler() {
+  DCHECK(CalledOnValidThread());
+  DCHECK(audio_scheduler_.get());
+
+  scoped_refptr<AudioScheduler> audio_scheduler = audio_scheduler_;
+  audio_scheduler_ = NULL;
+  audio_scheduler->Stop(base::Bind(&ClientSession::OnRecorderStopped,
+                                   base::Unretained(this)));
+}
+
+void ClientSession::StopScreenRecorder() {
+  DCHECK(CalledOnValidThread());
+  DCHECK(video_recorder_.get());
+
+  scoped_refptr<ScreenRecorder> video_recorder = video_recorder_;
+  video_recorder_ = NULL;
+  video_recorder->Stop(base::Bind(&ClientSession::OnRecorderStopped,
+                                  base::Unretained(this)));
+}
+
 }  // namespace remoting