media: add video capture device for ARC++ camera HAL v3

media/capture/video/chromeos/video_capture_device_arc_chromeos.cc

+// Copyright 2017 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/capture/video/chromeos/video_capture_device_arc_chromeos.h"
+
+#include "base/bind_helpers.h"
+#include "base/threading/platform_thread.h"
+#include "media/capture/video/chromeos/camera_device_delegate.h"
+#include "media/capture/video/chromeos/camera_hal_delegate.h"
+#include "ui/display/display.h"
+#include "ui/display/display_observer.h"
+#include "ui/display/screen.h"
+
+namespace media {
+
+VideoCaptureDeviceArcChromeOS::VideoCaptureDeviceArcChromeOS(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner_for_screen_observer,
+    const VideoCaptureDeviceDescriptor& device_descriptor,
+    scoped_refptr<CameraHalDelegate> camera_hal_delegate)
+    : device_descriptor_(device_descriptor),
+      camera_hal_delegate_(std::move(camera_hal_delegate)),
+      capture_task_runner_(base::ThreadTaskRunnerHandle::Get()),
+      camera_device_ipc_thread_(std::string("CameraDeviceIpcThread") +
+                                device_descriptor.device_id),
+      screen_observer_delegate_(new ScreenObserverDelegate(
+          this,
+          std::move(task_runner_for_screen_observer))),
+      lens_facing_(device_descriptor.facing),
+      camera_orientation_(0),
+      // External cameras have lens_facing as MEDIA_VIDEO_FACING_NONE.
+      // We don't want to rotate the frame even if the device rotates.
+      rotates_with_device_(lens_facing_ !=
+                           VideoFacingMode::MEDIA_VIDEO_FACING_NONE),
+      rotation_(0) {}
+
+VideoCaptureDeviceArcChromeOS::~VideoCaptureDeviceArcChromeOS() {
+  DCHECK(capture_task_runner_->BelongsToCurrentThread());
+  DCHECK(!camera_device_ipc_thread_.IsRunning());
+  screen_observer_delegate_->RemoveObserver();
+}
+
+// VideoCaptureDevice implementation.
+void VideoCaptureDeviceArcChromeOS::AllocateAndStart(
+    const VideoCaptureParams& params,
+    std::unique_ptr<Client> client) {
+  DCHECK(capture_task_runner_->BelongsToCurrentThread());
+  DCHECK(!camera_device_delegate_);
+
+  if (!camera_device_ipc_thread_.Start()) {
+    std::string error_msg = "Failed to start device thread";
+    LOG(ERROR) << error_msg;
+    client->OnError(FROM_HERE, error_msg);
+    return;
+  }
+  camera_device_delegate_ =
+      new CameraDeviceDelegate(device_descriptor_, camera_hal_delegate_,
+                               camera_device_ipc_thread_.task_runner());
+  camera_device_ipc_thread_.task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&CameraDeviceDelegate::AllocateAndStart,
+                 camera_device_delegate_, params, base::Passed(&client)));
+  camera_device_ipc_thread_.task_runner()->PostTask(
+      FROM_HERE, base::Bind(&CameraDeviceDelegate::SetRotation,
+                            camera_device_delegate_, rotation_));
+}
+
+void VideoCaptureDeviceArcChromeOS::StopAndDeAllocate() {
+  DCHECK(capture_task_runner_->BelongsToCurrentThread());
+
+  if (!camera_device_delegate_) {
+    return;
+  }
+  camera_device_ipc_thread_.task_runner()->PostTask(
+      FROM_HERE, base::Bind(&CameraDeviceDelegate::StopAndDeAllocate,
+                            camera_device_delegate_));
+  // Wait until all other references to |camera_device_delegate_| are dropped to
+  // make sure all the IPC calls are done.  This is best-effort as the camera
+  // HAL may never return, say, due to a deadlock, in which case the loop simply
+  // times out and we destroy everything.
+  const int kWaitTimeoutSecs = 3;
+  base::TimeTicks wait_until =
+      base::TimeTicks() + base::TimeDelta::FromSeconds(kWaitTimeoutSecs);
+  while (!camera_device_delegate_->HasOneRef()) {
+    if (base::TimeTicks() >= wait_until) {
+      LOG(ERROR) << "Timed out waiting capture device to stop";
+      break;
+    }
+    base::PlatformThread::YieldCurrentThread();
+  }
+  camera_device_ipc_thread_.Stop();
+  camera_device_delegate_ = nullptr;
+}
+
+void VideoCaptureDeviceArcChromeOS::TakePhoto(TakePhotoCallback callback) {
+  DCHECK(capture_task_runner_->BelongsToCurrentThread());
+  DCHECK(camera_device_delegate_);
+  camera_device_ipc_thread_.task_runner()->PostTask(
+      FROM_HERE, base::Bind(&CameraDeviceDelegate::TakePhoto,
+                            camera_device_delegate_, base::Passed(&callback)));
+}
+
+void VideoCaptureDeviceArcChromeOS::GetPhotoState(
+    GetPhotoStateCallback callback) {
+  DCHECK(capture_task_runner_->BelongsToCurrentThread());
+  camera_device_ipc_thread_.task_runner()->PostTask(
+      FROM_HERE, base::Bind(&CameraDeviceDelegate::GetPhotoState,
+                            camera_device_delegate_, base::Passed(&callback)));
+}
+
+void VideoCaptureDeviceArcChromeOS::SetPhotoOptions(
+    mojom::PhotoSettingsPtr settings,
+    SetPhotoOptionsCallback callback) {
+  DCHECK(capture_task_runner_->BelongsToCurrentThread());
+  camera_device_ipc_thread_.task_runner()->PostTask(
+      FROM_HERE, base::Bind(&CameraDeviceDelegate::SetPhotoOptions,
+                            camera_device_delegate_, base::Passed(&settings),
+                            base::Passed(&callback)));
+}
+
+void VideoCaptureDeviceArcChromeOS::SetDisplayRotation(
+    const display::Display& display) {
+  DCHECK(capture_task_runner_->BelongsToCurrentThread());
+  if (display.IsInternal())
+    SetRotation(display.rotation() * 90);
+}
+
+void VideoCaptureDeviceArcChromeOS::SetRotation(int rotation) {
+  DCHECK(capture_task_runner_->BelongsToCurrentThread());
+  if (!rotates_with_device_) {
+    rotation = 0;
+  } else if (lens_facing_ == VideoFacingMode::MEDIA_VIDEO_FACING_ENVIRONMENT) {
+    // Original frame when |rotation| = 0
+    // -----------------------
+    // |          *          |
+    // |         * *         |
+    // |        *   *        |
+    // |       *******       |
+    // |      *       *      |
+    // |     *         *     |
+    // -----------------------
+    //
+    // |rotation| = 90, this is what back camera sees
+    // -----------------------
+    // |    ********         |
+    // |       *   ****      |
+    // |       *      ***    |
+    // |       *      ***    |
+    // |       *   ****      |
+    // |    ********         |
+    // -----------------------
+    //
+    // |rotation| = 90, this is what front camera sees
+    // -----------------------
+    // |         ********    |
+    // |      ****   *       |
+    // |    ***      *       |
+    // |    ***      *       |
+    // |      ****   *       |
+    // |         ********    |
+    // -----------------------
+    //
+    // Therefore, for back camera, we need to rotate (360 - |rotation|).
+    rotation = (360 - rotation) % 360;
+  }
+  // Take into account camera orientation w.r.t. the display. External cameras
+  // would have camera_orientation_ as 0.
+  rotation_ = (rotation + camera_orientation_) % 360;
+  if (camera_device_ipc_thread_.IsRunning()) {
+    camera_device_ipc_thread_.task_runner()->PostTask(
+        FROM_HERE, base::Bind(&CameraDeviceDelegate::SetRotation,
+                              camera_device_delegate_, rotation_));
+  }
+}
+
+}  // namespace media