content/browser/media/capture/desktop_capture_device_aura.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/media/capture/desktop_capture_device_aura.h"
   6
   7 #include "base/logging.h"
   8 #include "base/metrics/histogram.h"
   9 #include "base/timer/timer.h"
  10 #include "cc/output/copy_output_request.h"
  11 #include "cc/output/copy_output_result.h"
  12 #include "content/browser/compositor/image_transport_factory.h"
  13 #include "content/browser/media/capture/content_video_capture_device_core.h"
  14 #include "content/browser/media/capture/desktop_capture_device_uma_types.h"
  15 #include "content/common/gpu/client/gl_helper.h"
  16 #include "content/public/browser/browser_thread.h"
  17 #include "media/base/bind_to_current_loop.h"
  18 #include "media/base/video_util.h"
  19 #include "media/video/capture/video_capture_types.h"
  20 #include "skia/ext/image_operations.h"
  21 #include "third_party/skia/include/core/SkBitmap.h"
  22 #include "ui/aura/client/screen_position_client.h"
  23 #include "ui/aura/env.h"
  24 #include "ui/aura/window.h"
  25 #include "ui/aura/window_observer.h"
  26 #include "ui/aura/window_tree_host.h"
  27 #include "ui/base/cursor/cursors_aura.h"
  28 #include "ui/compositor/compositor.h"
  29 #include "ui/compositor/dip_util.h"
  30 #include "ui/compositor/layer.h"
  31 #include "ui/gfx/screen.h"
  32
  33 namespace content {
  34
  35 namespace {
  36
  37 int clip_byte(int x) {
  38   return std::max(0, std::min(x, 255));
  39 }
  40
  41 int alpha_blend(int alpha, int src, int dst) {
  42   return (src * alpha + dst * (255 - alpha)) / 255;
  43 }
  44
  45 // Helper function to composite a cursor bitmap on a YUV420 video frame.
  46 void RenderCursorOnVideoFrame(
  47     const scoped_refptr<media::VideoFrame>& target,
  48     const SkBitmap& cursor_bitmap,
  49     const gfx::Point& cursor_position) {
  50   DCHECK(target);
  51   DCHECK(!cursor_bitmap.isNull());
  52
  53   gfx::Rect rect = gfx::IntersectRects(
  54       gfx::Rect(cursor_bitmap.width(), cursor_bitmap.height()) +
  55           gfx::Vector2d(cursor_position.x(), cursor_position.y()),
  56       target->visible_rect());
  57
  58   cursor_bitmap.lockPixels();
  59   for (int y = rect.y(); y < rect.bottom(); ++y) {
  60     int cursor_y = y - cursor_position.y();
  61     uint8* yplane = target->data(media::VideoFrame::kYPlane) +
  62         y * target->row_bytes(media::VideoFrame::kYPlane);
  63     uint8* uplane = target->data(media::VideoFrame::kUPlane) +
  64         (y / 2) * target->row_bytes(media::VideoFrame::kUPlane);
  65     uint8* vplane = target->data(media::VideoFrame::kVPlane) +
  66         (y / 2) * target->row_bytes(media::VideoFrame::kVPlane);
  67     for (int x = rect.x(); x < rect.right(); ++x) {
  68       int cursor_x = x - cursor_position.x();
  69       SkColor color = cursor_bitmap.getColor(cursor_x, cursor_y);
  70       int alpha = SkColorGetA(color);
  71       int color_r = SkColorGetR(color);
  72       int color_g = SkColorGetG(color);
  73       int color_b = SkColorGetB(color);
  74       int color_y = clip_byte(((color_r * 66 + color_g * 129 + color_b * 25 +
  75                                 128) >> 8) + 16);
  76       yplane[x] = alpha_blend(alpha, color_y, yplane[x]);
  77
  78       // Only sample U and V at even coordinates.
  79       if ((x % 2 == 0) && (y % 2 == 0)) {
  80         int color_u = clip_byte(((color_r * -38 + color_g * -74 +
  81                                   color_b * 112 + 128) >> 8) + 128);
  82         int color_v = clip_byte(((color_r * 112 + color_g * -94 +
  83                                   color_b * -18 + 128) >> 8) + 128);
  84         uplane[x / 2] = alpha_blend(alpha, color_u, uplane[x / 2]);
  85         vplane[x / 2] = alpha_blend(alpha, color_v, vplane[x / 2]);
  86       }
  87     }
  88   }
  89   cursor_bitmap.unlockPixels();
  90 }
  91
  92 class DesktopVideoCaptureMachine
  93     : public VideoCaptureMachine,
  94       public aura::WindowObserver,
  95       public ui::CompositorObserver,
  96       public base::SupportsWeakPtr<DesktopVideoCaptureMachine> {
  97  public:
  98   DesktopVideoCaptureMachine(const DesktopMediaID& source);
  99   virtual ~DesktopVideoCaptureMachine();
 100
 101   // VideoCaptureFrameSource overrides.
 102   virtual bool Start(const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
 103                      const media::VideoCaptureParams& params) OVERRIDE;
 104   virtual void Stop(const base::Closure& callback) OVERRIDE;
 105
 106   // Implements aura::WindowObserver.
 107   virtual void OnWindowBoundsChanged(aura::Window* window,
 108                                      const gfx::Rect& old_bounds,
 109                                      const gfx::Rect& new_bounds) OVERRIDE;
 110   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
 111   virtual void OnWindowAddedToRootWindow(aura::Window* window) OVERRIDE;
 112   virtual void OnWindowRemovingFromRootWindow(aura::Window* window,
 113                                               aura::Window* new_root) OVERRIDE;
 114
 115   // Implements ui::CompositorObserver.
 116   virtual void OnCompositingDidCommit(ui::Compositor* compositor) OVERRIDE {}
 117   virtual void OnCompositingStarted(ui::Compositor* compositor,
 118                                     base::TimeTicks start_time) OVERRIDE {}
 119   virtual void OnCompositingEnded(ui::Compositor* compositor) OVERRIDE;
 120   virtual void OnCompositingAborted(ui::Compositor* compositor) OVERRIDE {}
 121   virtual void OnCompositingLockStateChanged(
 122       ui::Compositor* compositor) OVERRIDE {}
 123
 124  private:
 125   // Captures a frame.
 126   // |dirty| is false for timer polls and true for compositor updates.
 127   void Capture(bool dirty);
 128
 129   // Update capture size. Must be called on the UI thread.
 130   void UpdateCaptureSize();
 131
 132   // Response callback for cc::Layer::RequestCopyOfOutput().
 133   void DidCopyOutput(
 134       scoped_refptr<media::VideoFrame> video_frame,
 135       base::TimeTicks start_time,
 136       const ThreadSafeCaptureOracle::CaptureFrameCallback& capture_frame_cb,
 137       scoped_ptr<cc::CopyOutputResult> result);
 138
 139   // A helper which does the real work for DidCopyOutput. Returns true if
 140   // succeeded.
 141   bool ProcessCopyOutputResponse(
 142       scoped_refptr<media::VideoFrame> video_frame,
 143       base::TimeTicks start_time,
 144       const ThreadSafeCaptureOracle::CaptureFrameCallback& capture_frame_cb,
 145       scoped_ptr<cc::CopyOutputResult> result);
 146
 147   // Helper function to update cursor state.
 148   // |region_in_frame| defines the desktop bound in the captured frame.
 149   // Returns the current cursor position in captured frame.
 150   gfx::Point UpdateCursorState(const gfx::Rect& region_in_frame);
 151
 152   // Clears cursor state.
 153   void ClearCursorState();
 154
 155   // The window associated with the desktop.
 156   aura::Window* desktop_window_;
 157
 158   // The timer that kicks off period captures.
 159   base::Timer timer_;
 160
 161   // The id of the window being captured.
 162   DesktopMediaID window_id_;
 163
 164   // Makes all the decisions about which frames to copy, and how.
 165   scoped_refptr<ThreadSafeCaptureOracle> oracle_proxy_;
 166
 167   // The capture parameters for this capture.
 168   media::VideoCaptureParams capture_params_;
 169
 170   // YUV readback pipeline.
 171   scoped_ptr<content::ReadbackYUVInterface> yuv_readback_pipeline_;
 172
 173   // Cursor state.
 174   ui::Cursor last_cursor_;
 175   gfx::Point cursor_hot_point_;
 176   SkBitmap scaled_cursor_bitmap_;
 177
 178   DISALLOW_COPY_AND_ASSIGN(DesktopVideoCaptureMachine);
 179 };
 180
 181 DesktopVideoCaptureMachine::DesktopVideoCaptureMachine(
 182     const DesktopMediaID& source)
 183     : desktop_window_(NULL),
 184       timer_(true, true),
 185       window_id_(source) {}
 186
 187 DesktopVideoCaptureMachine::~DesktopVideoCaptureMachine() {}
 188
 189 bool DesktopVideoCaptureMachine::Start(
 190     const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
 191     const media::VideoCaptureParams& params) {
 192   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 193
 194   desktop_window_ = content::DesktopMediaID::GetAuraWindowById(window_id_);
 195   if (!desktop_window_)
 196     return false;
 197
 198   // If the associated layer is already destroyed then return failure.
 199   ui::Layer* layer = desktop_window_->layer();
 200   if (!layer)
 201     return false;
 202
 203   DCHECK(oracle_proxy.get());
 204   oracle_proxy_ = oracle_proxy;
 205   capture_params_ = params;
 206
 207   // Update capture size.
 208   UpdateCaptureSize();
 209
 210   // Start observing window events.
 211   desktop_window_->AddObserver(this);
 212
 213   // Start observing compositor updates.
 214   if (desktop_window_->GetHost())
 215     desktop_window_->GetHost()->compositor()->AddObserver(this);
 216
 217   // Starts timer.
 218   timer_.Start(FROM_HERE, oracle_proxy_->capture_period(),
 219                base::Bind(&DesktopVideoCaptureMachine::Capture, AsWeakPtr(),
 220                           false));
 221
 222   started_ = true;
 223   return true;
 224 }
 225
 226 void DesktopVideoCaptureMachine::Stop(const base::Closure& callback) {
 227   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 228
 229   // Stop observing compositor and window events.
 230   if (desktop_window_) {
 231     if (desktop_window_->GetHost())
 232       desktop_window_->GetHost()->compositor()->RemoveObserver(this);
 233     desktop_window_->RemoveObserver(this);
 234     desktop_window_ = NULL;
 235   }
 236
 237   // Stop timer.
 238   timer_.Stop();
 239
 240   started_ = false;
 241
 242   callback.Run();
 243 }
 244
 245 void DesktopVideoCaptureMachine::UpdateCaptureSize() {
 246   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 247   if (oracle_proxy_ && desktop_window_) {
 248     ui::Layer* layer = desktop_window_->layer();
 249     oracle_proxy_->UpdateCaptureSize(ui::ConvertSizeToPixel(
 250         layer, layer->bounds().size()));
 251   }
 252   ClearCursorState();
 253 }
 254
 255 void DesktopVideoCaptureMachine::Capture(bool dirty) {
 256   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 257
 258   // Do not capture if the desktop window is already destroyed.
 259   if (!desktop_window_)
 260     return;
 261
 262   scoped_refptr<media::VideoFrame> frame;
 263   ThreadSafeCaptureOracle::CaptureFrameCallback capture_frame_cb;
 264
 265   const base::TimeTicks start_time = base::TimeTicks::Now();
 266   const VideoCaptureOracle::Event event =
 267       dirty ? VideoCaptureOracle::kCompositorUpdate
 268             : VideoCaptureOracle::kTimerPoll;
 269   if (oracle_proxy_->ObserveEventAndDecideCapture(
 270       event, start_time, &frame, &capture_frame_cb)) {
 271     scoped_ptr<cc::CopyOutputRequest> request =
 272         cc::CopyOutputRequest::CreateRequest(
 273             base::Bind(&DesktopVideoCaptureMachine::DidCopyOutput,
 274                        AsWeakPtr(), frame, start_time, capture_frame_cb));
 275     gfx::Rect window_rect =
 276         ui::ConvertRectToPixel(desktop_window_->layer(),
 277                                gfx::Rect(desktop_window_->bounds().width(),
 278                                          desktop_window_->bounds().height()));
 279     request->set_area(window_rect);
 280     desktop_window_->layer()->RequestCopyOfOutput(request.Pass());
 281   }
 282 }
 283
 284 void CopyOutputFinishedForVideo(
 285     base::TimeTicks start_time,
 286     const ThreadSafeCaptureOracle::CaptureFrameCallback& capture_frame_cb,
 287     const scoped_refptr<media::VideoFrame>& target,
 288     const SkBitmap& cursor_bitmap,
 289     const gfx::Point& cursor_position,
 290     scoped_ptr<cc::SingleReleaseCallback> release_callback,
 291     bool result) {
 292   if (!cursor_bitmap.isNull())
 293     RenderCursorOnVideoFrame(target, cursor_bitmap, cursor_position);
 294   release_callback->Run(0, false);
 295   capture_frame_cb.Run(target, start_time, result);
 296 }
 297
 298 void RunSingleReleaseCallback(scoped_ptr<cc::SingleReleaseCallback> cb,
 299                               const std::vector<uint32>& sync_points) {
 300   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 301   GLHelper* gl_helper = ImageTransportFactory::GetInstance()->GetGLHelper();
 302   DCHECK(gl_helper);
 303   for (unsigned i = 0; i < sync_points.size(); i++)
 304     gl_helper->WaitSyncPoint(sync_points[i]);
 305   uint32 new_sync_point = gl_helper->InsertSyncPoint();
 306   cb->Run(new_sync_point, false);
 307 }
 308
 309 void DesktopVideoCaptureMachine::DidCopyOutput(
 310     scoped_refptr<media::VideoFrame> video_frame,
 311     base::TimeTicks start_time,
 312     const ThreadSafeCaptureOracle::CaptureFrameCallback& capture_frame_cb,
 313     scoped_ptr<cc::CopyOutputResult> result) {
 314   static bool first_call = true;
 315
 316   bool succeeded = ProcessCopyOutputResponse(
 317       video_frame, start_time, capture_frame_cb, result.Pass());
 318
 319   base::TimeDelta capture_time = base::TimeTicks::Now() - start_time;
 320   UMA_HISTOGRAM_TIMES(
 321       window_id_.type == DesktopMediaID::TYPE_SCREEN ? kUmaScreenCaptureTime
 322                                                      : kUmaWindowCaptureTime,
 323       capture_time);
 324
 325   if (first_call) {
 326     first_call = false;
 327     if (window_id_.type == DesktopMediaID::TYPE_SCREEN) {
 328       IncrementDesktopCaptureCounter(succeeded ? FIRST_SCREEN_CAPTURE_SUCCEEDED
 329                                                : FIRST_SCREEN_CAPTURE_FAILED);
 330     } else {
 331       IncrementDesktopCaptureCounter(succeeded
 332                                          ? FIRST_WINDOW_CAPTURE_SUCCEEDED
 333                                          : FIRST_WINDOW_CAPTURE_FAILED);
 334     }
 335   }
 336 }
 337
 338 bool DesktopVideoCaptureMachine::ProcessCopyOutputResponse(
 339     scoped_refptr<media::VideoFrame> video_frame,
 340     base::TimeTicks start_time,
 341     const ThreadSafeCaptureOracle::CaptureFrameCallback& capture_frame_cb,
 342     scoped_ptr<cc::CopyOutputResult> result) {
 343   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 344   if (result->IsEmpty() || result->size().IsEmpty() || !desktop_window_)
 345     return false;
 346
 347   if (capture_params_.requested_format.pixel_format ==
 348       media::PIXEL_FORMAT_TEXTURE) {
 349     DCHECK(!video_frame);
 350     cc::TextureMailbox texture_mailbox;
 351     scoped_ptr<cc::SingleReleaseCallback> release_callback;
 352     result->TakeTexture(&texture_mailbox, &release_callback);
 353     DCHECK(texture_mailbox.IsTexture());
 354     if (!texture_mailbox.IsTexture())
 355       return false;
 356     video_frame = media::VideoFrame::WrapNativeTexture(
 357         make_scoped_ptr(new gpu::MailboxHolder(texture_mailbox.mailbox(),
 358                                                texture_mailbox.target(),
 359                                                texture_mailbox.sync_point())),
 360         media::BindToCurrentLoop(base::Bind(&RunSingleReleaseCallback,
 361                                             base::Passed(&release_callback))),
 362         result->size(),
 363         gfx::Rect(result->size()),
 364         result->size(),
 365         base::TimeDelta(),
 366         media::VideoFrame::ReadPixelsCB());
 367     capture_frame_cb.Run(video_frame, start_time, true);
 368     return true;
 369   }
 370
 371   // Compute the dest size we want after the letterboxing resize. Make the
 372   // coordinates and sizes even because we letterbox in YUV space
 373   // (see CopyRGBToVideoFrame). They need to be even for the UV samples to
 374   // line up correctly.
 375   // The video frame's coded_size() and the result's size() are both physical
 376   // pixels.
 377   gfx::Rect region_in_frame =
 378       media::ComputeLetterboxRegion(gfx::Rect(video_frame->coded_size()),
 379                                     result->size());
 380   region_in_frame = gfx::Rect(region_in_frame.x() & ~1,
 381                               region_in_frame.y() & ~1,
 382                               region_in_frame.width() & ~1,
 383                               region_in_frame.height() & ~1);
 384   if (region_in_frame.IsEmpty())
 385     return false;
 386
 387   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
 388   GLHelper* gl_helper = factory->GetGLHelper();
 389   if (!gl_helper)
 390     return false;
 391
 392   cc::TextureMailbox texture_mailbox;
 393   scoped_ptr<cc::SingleReleaseCallback> release_callback;
 394   result->TakeTexture(&texture_mailbox, &release_callback);
 395   DCHECK(texture_mailbox.IsTexture());
 396   if (!texture_mailbox.IsTexture())
 397     return false;
 398
 399   gfx::Rect result_rect(result->size());
 400   if (!yuv_readback_pipeline_ ||
 401       yuv_readback_pipeline_->scaler()->SrcSize() != result_rect.size() ||
 402       yuv_readback_pipeline_->scaler()->SrcSubrect() != result_rect ||
 403       yuv_readback_pipeline_->scaler()->DstSize() != region_in_frame.size()) {
 404     yuv_readback_pipeline_.reset(
 405         gl_helper->CreateReadbackPipelineYUV(GLHelper::SCALER_QUALITY_FAST,
 406                                              result_rect.size(),
 407                                              result_rect,
 408                                              video_frame->coded_size(),
 409                                              region_in_frame,
 410                                              true,
 411                                              true));
 412   }
 413
 414   gfx::Point cursor_position_in_frame = UpdateCursorState(region_in_frame);
 415   yuv_readback_pipeline_->ReadbackYUV(
 416       texture_mailbox.mailbox(),
 417       texture_mailbox.sync_point(),
 418       video_frame.get(),
 419       base::Bind(&CopyOutputFinishedForVideo,
 420                  start_time,
 421                  capture_frame_cb,
 422                  video_frame,
 423                  scaled_cursor_bitmap_,
 424                  cursor_position_in_frame,
 425                  base::Passed(&release_callback)));
 426   return true;
 427 }
 428
 429 gfx::Point DesktopVideoCaptureMachine::UpdateCursorState(
 430     const gfx::Rect& region_in_frame) {
 431   const gfx::Rect desktop_bounds = desktop_window_->layer()->bounds();
 432   gfx::NativeCursor cursor =
 433       desktop_window_->GetHost()->last_cursor();
 434   if (last_cursor_ != cursor) {
 435     SkBitmap cursor_bitmap;
 436     if (ui::GetCursorBitmap(cursor, &cursor_bitmap, &cursor_hot_point_)) {
 437       scaled_cursor_bitmap_ = skia::ImageOperations::Resize(
 438           cursor_bitmap,
 439           skia::ImageOperations::RESIZE_BEST,
 440           cursor_bitmap.width() * region_in_frame.width() /
 441               desktop_bounds.width(),
 442           cursor_bitmap.height() * region_in_frame.height() /
 443               desktop_bounds.height());
 444       last_cursor_ = cursor;
 445     } else {
 446       // Clear cursor state if ui::GetCursorBitmap failed so that we do not
 447       // render cursor on the captured frame.
 448       ClearCursorState();
 449     }
 450   }
 451
 452   gfx::Point cursor_position = aura::Env::GetInstance()->last_mouse_location();
 453   aura::client::GetScreenPositionClient(desktop_window_->GetRootWindow())->
 454       ConvertPointFromScreen(desktop_window_, &cursor_position);
 455   const gfx::Point hot_point_in_dip = ui::ConvertPointToDIP(
 456       desktop_window_->layer(), cursor_hot_point_);
 457   cursor_position.Offset(-desktop_bounds.x() - hot_point_in_dip.x(),
 458                          -desktop_bounds.y() - hot_point_in_dip.y());
 459   return gfx::Point(
 460       region_in_frame.x() + cursor_position.x() * region_in_frame.width() /
 461           desktop_bounds.width(),
 462       region_in_frame.y() + cursor_position.y() * region_in_frame.height() /
 463           desktop_bounds.height());
 464 }
 465
 466 void DesktopVideoCaptureMachine::ClearCursorState() {
 467   last_cursor_ = ui::Cursor();
 468   cursor_hot_point_ = gfx::Point();
 469   scaled_cursor_bitmap_.reset();
 470 }
 471
 472 void DesktopVideoCaptureMachine::OnWindowBoundsChanged(
 473     aura::Window* window,
 474     const gfx::Rect& old_bounds,
 475     const gfx::Rect& new_bounds) {
 476   DCHECK(desktop_window_ && window == desktop_window_);
 477
 478   // Post task to update capture size on UI thread.
 479   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
 480       &DesktopVideoCaptureMachine::UpdateCaptureSize, AsWeakPtr()));
 481 }
 482
 483 void DesktopVideoCaptureMachine::OnWindowDestroyed(aura::Window* window) {
 484   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 485
 486   Stop(base::Bind(&base::DoNothing));
 487
 488   oracle_proxy_->ReportError("OnWindowDestroyed()");
 489 }
 490
 491 void DesktopVideoCaptureMachine::OnWindowAddedToRootWindow(
 492     aura::Window* window) {
 493   DCHECK(window == desktop_window_);
 494   window->GetHost()->compositor()->AddObserver(this);
 495 }
 496
 497 void DesktopVideoCaptureMachine::OnWindowRemovingFromRootWindow(
 498     aura::Window* window,
 499     aura::Window* new_root) {
 500   DCHECK(window == desktop_window_);
 501   window->GetHost()->compositor()->RemoveObserver(this);
 502 }
 503
 504 void DesktopVideoCaptureMachine::OnCompositingEnded(
 505     ui::Compositor* compositor) {
 506   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
 507       &DesktopVideoCaptureMachine::Capture, AsWeakPtr(), true));
 508 }
 509
 510 }  // namespace
 511
 512 DesktopCaptureDeviceAura::DesktopCaptureDeviceAura(
 513     const DesktopMediaID& source)
 514     : core_(new ContentVideoCaptureDeviceCore(scoped_ptr<VideoCaptureMachine>(
 515         new DesktopVideoCaptureMachine(source)))) {}
 516
 517 DesktopCaptureDeviceAura::~DesktopCaptureDeviceAura() {
 518   DVLOG(2) << "DesktopCaptureDeviceAura@" << this << " destroying.";
 519 }
 520
 521 // static
 522 media::VideoCaptureDevice* DesktopCaptureDeviceAura::Create(
 523     const DesktopMediaID& source) {
 524   IncrementDesktopCaptureCounter(source.type == DesktopMediaID::TYPE_SCREEN
 525                                      ? SCREEN_CAPTURER_CREATED
 526                                      : WINDOW_CAPTURER_CREATED);
 527   return new DesktopCaptureDeviceAura(source);
 528 }
 529
 530 void DesktopCaptureDeviceAura::AllocateAndStart(
 531     const media::VideoCaptureParams& params,
 532     scoped_ptr<Client> client) {
 533   DVLOG(1) << "Allocating " << params.requested_format.frame_size.ToString();
 534   core_->AllocateAndStart(params, client.Pass());
 535 }
 536
 537 void DesktopCaptureDeviceAura::StopAndDeAllocate() {
 538   core_->StopAndDeAllocate();
 539 }
 540
 541 }  // namespace content