[Mojo Video Capture] Split OnIncomingCapturedVideoFrame() to OnNewBuffer() and OnFrameReadyInBuffer(

content/browser/renderer_host/media/video_capture_controller.h

Index: content/browser/renderer_host/media/video_capture_controller.h
diff --git a/content/browser/renderer_host/media/video_capture_controller.h b/content/browser/renderer_host/media/video_capture_controller.h
index d54e26fd9b1b809879c7a041cea297739a27c9eb..2f7d25beb78ba70cdc35df2e8db561b577e479b2 100644
--- a/content/browser/renderer_host/media/video_capture_controller.h
+++ b/content/browser/renderer_host/media/video_capture_controller.h
@@ -1,41 +1,6 @@
 // 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.
-//
-// VideoCaptureController is the glue between a VideoCaptureDevice and all
-// VideoCaptureHosts that have connected to it. A controller exists on behalf of
-// one (and only one) VideoCaptureDevice; both are owned by the
-// VideoCaptureManager.
-//
-// The VideoCaptureController is responsible for:
-//
-//   * Allocating and keeping track of shared memory buffers, and filling them
-//     with I420 video frames for IPC communication between VideoCaptureHost (in
-//     the browser process) and VideoCaptureMessageFilter (in the renderer
-//     process).
-//   * Broadcasting the events from a single VideoCaptureDevice, fanning them
-//     out to multiple clients.
-//   * Keeping track of the clients on behalf of the VideoCaptureManager, making
-//     it possible for the Manager to delete the Controller and its Device when
-//     there are no clients left.
-//
-// Interactions between VideoCaptureController and other classes:
-//
-//   * VideoCaptureController indirectly observes a VideoCaptureDevice
-//     by means of its proxy, VideoCaptureDeviceClient, which implements
-//     the VideoCaptureDevice::Client interface. The proxy forwards
-//     observed events to the VideoCaptureController on the IO thread.
-//   * A VideoCaptureController interacts with its clients (VideoCaptureHosts)
-//     via the VideoCaptureControllerEventHandler interface.
-//   * Conversely, a VideoCaptureControllerEventHandler (typically,
-//     VideoCaptureHost) will interact directly with VideoCaptureController to
-//     return leased buffers by means of the ReturnBuffer() public method of
-//     VCC.
-//   * VideoCaptureManager (which owns the VCC) interacts directly with
-//     VideoCaptureController through its public methods, to add and remove
-//     clients.
-//
-// VideoCaptureController is not thread safe and operates on the IO thread only.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_H_
@@ -54,12 +19,10 @@
 #include "media/capture/video/video_frame_receiver.h"
 #include "media/capture/video_capture_types.h"
 
-namespace media {
-class FrameBufferPool;
-}
-
 namespace content {
 
+// Implementation of media::VideoFrameReceiver that distributes received frames
+// to potentially multiple connected clients.
 class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
  public:
   VideoCaptureController();
@@ -67,11 +30,6 @@ class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
 
   base::WeakPtr<VideoCaptureController> GetWeakPtrForIOThread();
 
-  // A FrameBufferPool may optionally be set in order to receive notifications
-  // when a frame is starting to get consumed and has finished getting consumed.
-  void SetFrameBufferPool(
-      std::unique_ptr<media::FrameBufferPool> frame_buffer_pool);
-
   // Factory code creating instances of VideoCaptureController may optionally
   // set a VideoFrameConsumerFeedbackObserver. Setting the observer is done in
   // this method separate from the constructor to allow clients to create and
@@ -129,12 +87,20 @@ class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
   bool has_received_frames() const { return has_received_frames_; }
 
   // Implementation of media::VideoFrameReceiver interface:
-  void OnIncomingCapturedVideoFrame(
-      media::VideoCaptureDevice::Client::Buffer buffer,
-      scoped_refptr<media::VideoFrame> frame) override;
+  void OnNewBufferHandle(
+      int buffer_id,
+      std::unique_ptr<media::VideoCaptureDevice::Client::Buffer::HandleProvider>
+          handle_provider) override;
+  void OnFrameReadyInBuffer(
+      int buffer_id,
+      int frame_feedback_id,
+      std::unique_ptr<
+          media::VideoCaptureDevice::Client::Buffer::ScopedAccessPermission>
+          buffer_read_permission,
+      media::mojom::VideoFrameInfoPtr frame_info) override;
+  void OnBufferRetired(int buffer_id) override;
   void OnError() override;
   void OnLog(const std::string& message) override;
-  void OnBufferRetired(int buffer_id) override;
 
  private:
   struct ControllerClient;
@@ -146,10 +112,10 @@ class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
         int buffer_context_id,
         int buffer_id,
         media::VideoFrameConsumerFeedbackObserver* consumer_feedback_observer,
-        media::FrameBufferPool* frame_buffer_pool);
+        mojo::ScopedSharedBufferHandle handle);
     ~BufferContext();
-    BufferContext(const BufferContext& other);
-    BufferContext& operator=(const BufferContext& other);
+    BufferContext(BufferContext&& other);
+    BufferContext& operator=(BufferContext&& other);
     int buffer_context_id() const { return buffer_context_id_; }
     int buffer_id() const { return buffer_id_; }
     bool is_retired() const { return is_retired_; }
@@ -159,13 +125,17 @@ class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
         media::VideoFrameConsumerFeedbackObserver* consumer_feedback_observer) {
       consumer_feedback_observer_ = consumer_feedback_observer;
     }
-    void set_frame_buffer_pool(media::FrameBufferPool* frame_buffer_pool) {
-      frame_buffer_pool_ = frame_buffer_pool;
+    void set_read_permission(
+        std::unique_ptr<
+            media::VideoCaptureDevice::Client::Buffer::ScopedAccessPermission>
+            buffer_read_permission) {
+      buffer_read_permission_ = std::move(buffer_read_permission);
     }
     void RecordConsumerUtilization(double utilization);
     void IncreaseConsumerCount();
     void DecreaseConsumerCount();
-    bool HasZeroConsumerHoldCount();
+    bool HasConsumers() const { return consumer_hold_count_ > 0; }
+    mojo::ScopedSharedBufferHandle CloneHandle();
 
    private:
     int buffer_context_id_;
@@ -173,9 +143,12 @@ class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
     bool is_retired_;
     int frame_feedback_id_;
     media::VideoFrameConsumerFeedbackObserver* consumer_feedback_observer_;
-    media::FrameBufferPool* frame_buffer_pool_;
+    mojo::ScopedSharedBufferHandle buffer_handle_;
     double max_consumer_utilization_;
     int consumer_hold_count_;
+    std::unique_ptr<
+        media::VideoCaptureDevice::Client::Buffer::ScopedAccessPermission>
+        buffer_read_permission_;
   };
 
   // Find a client of |id| and |handler| in |clients|.
@@ -198,8 +171,6 @@ class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
   void ReleaseBufferContext(
       const std::vector<BufferContext>::iterator& buffer_state_iter);
 
-  std::unique_ptr<media::FrameBufferPool> frame_buffer_pool_;
-
   std::unique_ptr<media::VideoFrameConsumerFeedbackObserver>
       consumer_feedback_observer_;