Use texture-backed VideoFrame pipeline for Aura desktop capturing.

content/browser/media/capture/web_contents_video_capture_device.cc

 // Copyright (c) 2012 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.
 //
 // Implementation notes: This needs to work on a variety of hardware
 // configurations where the speed of the CPU and GPU greatly affect overall
 // performance. Spanning several threads, the process of capturing has been
 // split up into four conceptual stages:
 //
 //   1. Reserve Buffer: Before a frame can be captured, a slot in the client's
@@ skipping 76 matching lines @@
 
 // Compute a letterbox region, aligned to even coordinates.
 gfx::Rect ComputeYV12LetterboxRegion(const gfx::Size& frame_size,
                                      const gfx::Size& content_size) {
 
   gfx::Rect result = media::ComputeLetterboxRegion(gfx::Rect(frame_size),
                                                    content_size);
 
   result.set_x(MakeEven(result.x()));
   result.set_y(MakeEven(result.y()));
-  result.set_width(std::max(kMinFrameWidth, MakeEven(result.width())));
-  result.set_height(std::max(kMinFrameHeight, MakeEven(result.height())));
 
   return result;
 }
 
-// Wrapper function to invoke ThreadSafeCaptureOracle::CaptureFrameCallback, is
-// compatible with RenderWidgetHostViewFrameSubscriber::DeliverFrameCallback.
-void InvokeCaptureFrameCallback(
-    const ThreadSafeCaptureOracle::CaptureFrameCallback& capture_frame_cb,
-    base::TimeTicks timestamp,
-    bool frame_captured) {
-  capture_frame_cb.Run(timestamp, frame_captured);
-}
-
 void DeleteOnWorkerThread(scoped_ptr<base::Thread> render_thread,
                           const base::Closure& callback) {
   render_thread.reset();
 
   // After thread join call the callback on UI thread.
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, callback);
 }
 
 // Responsible for logging the effective frame rate.
 class VideoFrameDeliveryLog {
@@ skipping 109 matching lines @@
 // notification would get posted back to the UI thread and processed later, and
 // this seems disadvantageous.
 class WebContentsCaptureMachine
     : public VideoCaptureMachine,
       public WebContentsObserver {
  public:
   WebContentsCaptureMachine(int render_process_id, int render_view_id);
   virtual ~WebContentsCaptureMachine();
 
   // VideoCaptureMachine overrides.
-  virtual bool Start(
-      const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy) OVERRIDE;
+  virtual bool Start(const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
+                     const media::VideoCaptureParams& params) OVERRIDE;
   virtual void Stop(const base::Closure& callback) OVERRIDE;
 
   // Starts a copy from the backing store or the composited surface. Must be run
   // on the UI BrowserThread. |deliver_frame_cb| will be run when the operation
   // completes. The copy will occur to |target|.
   //
   // This may be used as a ContentCaptureSubscription::CaptureCallback.
   void Capture(const base::TimeTicks& start_time,
                const scoped_refptr<media::VideoFrame>& target,
                const RenderWidgetHostViewFrameSubscriber::DeliverFrameCallback&
@@ skipping 59 matching lines @@
   const int initial_render_process_id_;
   const int initial_render_view_id_;
 
   // A dedicated worker thread on which SkBitmap->VideoFrame conversion will
   // occur. Only used when this activity cannot be done on the GPU.
   scoped_ptr<base::Thread> render_thread_;
 
   // Makes all the decisions about which frames to copy, and how.
   scoped_refptr<ThreadSafeCaptureOracle> oracle_proxy_;
 
+  // Video capture parameters that this machine is started with.
+  media::VideoCaptureParams capture_params_;
+
   // Routing ID of any active fullscreen render widget or MSG_ROUTING_NONE
   // otherwise.
   int fullscreen_widget_id_;
 
   // Last known RenderView size.
   gfx::Size last_view_size_;
 
   // Responsible for forwarding events from the active RenderWidgetHost to the
   // oracle, and initiating captures accordingly.
   scoped_ptr<ContentCaptureSubscription> subscription_;
 
   // Weak pointer factory used to invalidate callbacks.
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<WebContentsCaptureMachine> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsCaptureMachine);
 };
 
 bool FrameSubscriber::ShouldCaptureFrame(
     base::TimeTicks present_time,
     scoped_refptr<media::VideoFrame>* storage,
     DeliverFrameCallback* deliver_frame_cb) {
   TRACE_EVENT1("mirroring", "FrameSubscriber::ShouldCaptureFrame",
                "instance", this);
 
   ThreadSafeCaptureOracle::CaptureFrameCallback capture_frame_cb;
   bool oracle_decision = oracle_proxy_->ObserveEventAndDecideCapture(
       event_type_, present_time, storage, &capture_frame_cb);
 
-  *deliver_frame_cb = base::Bind(&InvokeCaptureFrameCallback, capture_frame_cb);
+  if (!capture_frame_cb.is_null())
+    *deliver_frame_cb = base::Bind(capture_frame_cb, *storage);
   if (oracle_decision)
     delivery_log_->ChronicleFrameDelivery(present_time);
   return oracle_decision;
 }
 
 ContentCaptureSubscription::ContentCaptureSubscription(
     const RenderWidgetHost& source,
     const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
     const CaptureCallback& capture_callback)
     : render_process_id_(source.GetProcess()->GetID()),
@@ skipping 209 matching lines @@
       weak_ptr_factory_(this) {}
 
 WebContentsCaptureMachine::~WebContentsCaptureMachine() {
   BrowserThread::PostBlockingPoolTask(
       FROM_HERE,
       base::Bind(&DeleteOnWorkerThread, base::Passed(&render_thread_),
                  base::Bind(&base::DoNothing)));
 }
 
 bool WebContentsCaptureMachine::Start(
-    const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy) {
+    const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
+    const media::VideoCaptureParams& params) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!started_);
 
   DCHECK(oracle_proxy.get());
   oracle_proxy_ = oracle_proxy;
+  capture_params_ = params;
 
   render_thread_.reset(new base::Thread("WebContentsVideo_RenderThread"));
   if (!render_thread_->Start()) {
     DVLOG(1) << "Failed to spawn render thread.";
     render_thread_.reset();
     return false;
   }
 
   if (!StartObservingWebContents()) {
     DVLOG(1) << "Failed to observe web contents.";
@@ skipping 221 matching lines @@
     scoped_ptr<Client> client) {
   DVLOG(1) << "Allocating " << params.requested_format.frame_size.ToString();
   core_->AllocateAndStart(params, client.Pass());
 }
 
 void WebContentsVideoCaptureDevice::StopAndDeAllocate() {
   core_->StopAndDeAllocate();
 }
 
 }  // namespace content