Implement GpuArcVideoService for arc video accelerator

content/common/gpu/media/gpu_arc_video_service.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/common/gpu/media/gpu_arc_video_service.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/single_thread_task_runner.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/thread_task_runner_handle.h"
+#include "content/common/gpu/gpu_messages.h"
+#include "ipc/ipc_listener.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_sync_channel.h"
+
+namespace content {
+
+// AcceleratorStub's all methods are running on arc thread.
+// TODO(kcwu) implement ArcVideoAccelerator::Client.
+class GpuArcVideoService::AcceleratorStub : public IPC::Listener,
+                                            public IPC::Sender,
+                                            public base::NonThreadSafe {
+ public:
+  // |owner| outlives AcceleratorStub.
+  AcceleratorStub(GpuArcVideoService* owner)
+      : owner_(owner), arc_task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
+
+  ~AcceleratorStub() override {
+    DCHECK(CalledOnValidThread());
+    channel_->Close();
+  }
+
+  IPC::ChannelHandle CreateChannel(
+      base::WaitableEvent* shutdown_event,
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner) {
+    IPC::ChannelHandle handle =
+        IPC::Channel::GenerateVerifiedChannelID("arc-video");
+    channel_ = IPC::SyncChannel::Create(handle, IPC::Channel::MODE_SERVER, this,
+                                        io_task_runner, false, shutdown_event);
+#if defined(OS_POSIX)
+    base::ScopedFD client_fd = channel_->TakeClientFileDescriptor();
+    DCHECK(client_fd.is_valid());
+    handle.socket = base::FileDescriptor(std::move(client_fd));
+#endif
+    return handle;
+  }
+
+  // IPC::Sender implementation:
+  bool Send(IPC::Message* msg) override {
+    DCHECK(msg);
+    return channel_->Send(msg);
+  }
+
+  // IPC::Listener implementation:
+  void OnChannelError() override {
+    DCHECK(CalledOnValidThread());
+    // RemoveClientOnArcThread will delete |this|.
+    owner_->RemoveClientOnArcThread(this);
+  }
+
+  // IPC::Listener implementation:
+  bool OnMessageReceived(const IPC::Message& msg) override {
+    DCHECK(CalledOnValidThread());
+
+    // TODO(kcwu) Add handlers here.
+    return false;
+  }
+
+ private:
+  GpuArcVideoService* owner_;
+  scoped_ptr<IPC::SyncChannel> channel_;
+  const scoped_refptr<base::SingleThreadTaskRunner> arc_task_runner_;
+};
+
+GpuArcVideoService::GpuArcVideoService(
+    base::WaitableEvent* shutdown_event,
+    const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner)
+    : shutdown_event_(shutdown_event),
+      io_task_runner_(io_task_runner),
+      task_runner_(base::ThreadTaskRunnerHandle::Get()),
+      arc_video_accelerator_thread_("ArcVideoAcceleratorThread") {}
+
+GpuArcVideoService::~GpuArcVideoService() {
+  DCHECK(CalledOnValidThread());
+
+  if (!arc_video_accelerator_thread_.IsRunning())
+    return;
+
+  base::WaitableEvent done(false, false);
+  arc_task_runner_->PostTask(
+      FROM_HERE, base::Bind(&GpuArcVideoService::RemoveAllClientsOnArcThread,
+                            base::Unretained(this), base::Unretained(&done)));
+  done.Wait();
+
+  arc_video_accelerator_thread_.Stop();
+}
+
+void GpuArcVideoService::Initialize() {
+  DCHECK(CalledOnValidThread());
+
+  arc_video_accelerator_thread_.Start();
+  arc_task_runner_ = arc_video_accelerator_thread_.task_runner();
+}
+
+void GpuArcVideoService::CreateChannel(const CreateChannelCallback& callback) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(arc_task_runner_);
+
+  // It's safe to Unretained |this| because the thread is owned by |this|.
+  arc_task_runner_->PostTask(
+      FROM_HERE, base::Bind(&GpuArcVideoService::CreateClientOnArcThread,
+                            base::Unretained(this), callback));
+}
+
+void GpuArcVideoService::CreateClientOnArcThread(
+    const CreateChannelCallback& callback) {
+  DCHECK(arc_task_runner_->BelongsToCurrentThread());
+  scoped_ptr<AcceleratorStub> stub(new AcceleratorStub(this));
+
+  IPC::ChannelHandle handle =
+      stub->CreateChannel(shutdown_event_, io_task_runner_);
+  accelerator_stubs_[stub.get()] = std::move(stub);
+
+  task_runner_->PostTask(FROM_HERE, base::Bind(callback, handle));
+}
+
+void GpuArcVideoService::RemoveClientOnArcThread(AcceleratorStub* stub) {
+  DCHECK(arc_task_runner_->BelongsToCurrentThread());
+  accelerator_stubs_.erase(stub);
+}
+
+void GpuArcVideoService::RemoveAllClientsOnArcThread(
+    base::WaitableEvent* done) {
+  DCHECK(arc_task_runner_->BelongsToCurrentThread());
+  accelerator_stubs_.clear();
+  done->Signal();
+}
+
+}  // namespace content