Implement GpuArcVideoService for arc video accelerator

content/browser/gpu/gpu_arc_video_service_host.cc

+// Copyright 2015 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 "content/browser/gpu/gpu_arc_video_service_host.h"
+
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "content/browser/gpu/gpu_process_host.h"
+#include "content/common/gpu/gpu_messages.h"
+#include "content/public/browser/arc_video_service.h"
+#include "content/public/browser/browser_thread.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+#include "third_party/mojo/src/mojo/edk/embedder/embedder.h"
+
+namespace content {
+
+namespace {
+void CreateChannelOnIOThread(
+    const GpuProcessHost::CreateArcVideoAcceleratorChannelCallback& callback) {
+  GpuProcessHost* gpu_process_host =
+      GpuProcessHost::Get(GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
+                          CAUSE_FOR_GPU_LAUNCH_ARCVIDEOACCELERATOR);
+  gpu_process_host->CreateArcVideoAcceleratorChannel(callback);
+}
+}
+
+scoped_ptr<arc::ArcVideoService> CreateArcVideoService() {
+  return make_scoped_ptr(new GpuArcVideoServiceHost());
+}
+
+GpuArcVideoServiceHost::GpuArcVideoServiceHost()
+    : io_task_runner_(content::BrowserThread::GetMessageLoopProxyForThread(
+          content::BrowserThread::IO)),
+      binding_(this),
+      weak_factory_(this) {}
+
+GpuArcVideoServiceHost::~GpuArcVideoServiceHost() {
+  DCHECK(CalledOnValidThread());
+
+  arc::ArcBridgeService* bridge_service = arc::ArcBridgeService::Get();
+  if (bridge_service) {
+    bridge_service->RemoveObserver(this);
+  }
+}
+
+void GpuArcVideoServiceHost::Initialize() {
+  DCHECK(CalledOnValidThread());
+
+  arc::ArcBridgeService* bridge_service = arc::ArcBridgeService::Get();
+  DCHECK(bridge_service);
+  bridge_service->AddObserver(this);
+  if (bridge_service->video_instance())

[Owen Lin, 2015/12/29 05:31:42]

Please add comment to explain the two cases.

[kcwu, 2015/12/29 13:24:43]

Done.

+    OnVideoInstanceReady();
+}
+
+void GpuArcVideoServiceHost::OnStateChanged(
+    arc::ArcBridgeService::State state) {
+  DCHECK(CalledOnValidThread());
+  switch (state) {
+    case arc::ArcBridgeService::State::STOPPING:
+      Shutdown();
+      break;
+    default:
+      break;
+  }
+}
+
+void GpuArcVideoServiceHost::OnVideoInstanceReady() {
+  DCHECK(CalledOnValidThread());
+  arc::ArcBridgeService* bridge_service = arc::ArcBridgeService::Get();
+  DCHECK(bridge_service);
+
+  arc::VideoHostPtr host;
+  binding_.Bind(mojo::GetProxy(&host));
+  bridge_service->video_instance()->Init(std::move(host));
+}
+
+void GpuArcVideoServiceHost::OnRequestArcVideoAcceleratorChannel(
+    const OnRequestArcVideoAcceleratorChannelCallback& callback) {
+  DCHECK(CalledOnValidThread());
+
+  io_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&CreateChannelOnIOThread,
+                 base::Bind(&GpuArcVideoServiceHost::HandleChannelCreatedReply,
+                            weak_factory_.GetWeakPtr(), callback)));
+}
+
+void GpuArcVideoServiceHost::Shutdown() {
+  GpuProcessHost::SendOnIO(GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
+                           CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
+                           new GpuMsg_ShutdownArcVideoService());
+}
+
+void GpuArcVideoServiceHost::HandleChannelCreatedReply(
+    const OnRequestArcVideoAcceleratorChannelCallback& callback,
+    const IPC::ChannelHandle& handle) {
+  DCHECK(CalledOnValidThread());
+
+  MojoHandle wrapped_handle;
+  MojoResult wrap_result = mojo::embedder::CreatePlatformHandleWrapper(
+      mojo::embedder::ScopedPlatformHandle(
+          mojo::embedder::PlatformHandle(handle.socket.fd)),
+      &wrapped_handle);
+  if (wrap_result != MOJO_RESULT_OK) {
+    LOG(WARNING) << "Pipe failed to wrap handles. Closing: " << wrap_result;
+    callback.Run(mojo::ScopedHandle());
+    return;
+  }
+  callback.Run(mojo::ScopedHandle(mojo::Handle(wrapped_handle)));
+}
+
+}  // namespace content