Media Remoting: Add remoting control logic for encrypted contents.

media/remoting/remoting_cdm_controller.cc

+// 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.
+
+#include "media/remoting/remoting_cdm_controller.h"
+
+#include "base/bind.h"
+#include "base/callback_helpers.h"
+#include "base/logging.h"
+#include "base/threading/thread_checker.h"
+
+namespace media {
+
+RemotingCdmController::RemotingCdmController(
+    scoped_refptr<RemotingSourceImpl> remoting_source)
+    : remoting_source_(std::move(remoting_source)) {
+  remoting_source_->AddClient(this);
+}
+
+RemotingCdmController::~RemotingCdmController() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  remoting_source_->RemoveClient(this);
+}
+
+void RemotingCdmController::OnStarted(bool success) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  DCHECK(!cdm_check_cb_.is_null());
+  is_remoting_ = success;
+  base::ResetAndReturn(&cdm_check_cb_).Run(success);
+}
+
+void RemotingCdmController::OnSessionStateChanged() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  if (is_remoting_ &&
+      remoting_source_->state() == RemotingSessionState::SESSION_STOPPING) {
+    remoting_source_->Shutdown();
+    is_remoting_ = false;
+  }
+}
+
+void RemotingCdmController::ShouldCreateRemotingCdm(
+    const CdmCheckCallback& cb) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK(!cb.is_null());
+
+  if (is_remoting_) {
+    cb.Run(true);
+    return;
+  }
+
+  DCHECK(cdm_check_cb_.is_null());
+  cdm_check_cb_ = cb;
+  remoting_source_->StartRemoting(this);
+}
+
+}  // namespace media