cc/layers/video_frame_provider_client_impl.h

   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 #ifndef CC_LAYERS_VIDEO_FRAME_PROVIDER_CLIENT_IMPL_H_
   6 #define CC_LAYERS_VIDEO_FRAME_PROVIDER_CLIENT_IMPL_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/synchronization/lock.h"
  10 #include "base/threading/thread_checker.h"
  11 #include "cc/base/cc_export.h"
  12 #include "cc/layers/video_frame_provider.h"
  13 #include "cc/scheduler/video_frame_controller.h"
  14 #include "ui/gfx/transform.h"
  15
  16 namespace media { class VideoFrame; }
  17
  18 namespace cc {
  19 class VideoLayerImpl;
  20
  21 // VideoFrameProviderClientImpl liasons with the VideoFrameProvider and the
  22 // VideoLayer. It receives updates from the provider and updates the layer as a
  23 // result. It also allows the layer to access the video frame that the provider
  24 // has.
  25 class CC_EXPORT VideoFrameProviderClientImpl
  26     : public VideoFrameProvider::Client,
  27       public VideoFrameController,
  28       public base::RefCounted<VideoFrameProviderClientImpl> {
  29  public:
  30   // Must be created on the impl thread while the main thread is blocked.
  31   static scoped_refptr<VideoFrameProviderClientImpl> Create(
  32       VideoFrameProvider* provider,
  33       VideoFrameControllerClient* client);
  34
  35   VideoLayerImpl* ActiveVideoLayer() const;
  36   void SetActiveVideoLayer(VideoLayerImpl* video_layer);
  37
  38   bool Stopped() const;
  39   // Must be called on the impl thread while the main thread is blocked.
  40   void Stop();
  41
  42   scoped_refptr<media::VideoFrame> AcquireLockAndCurrentFrame();
  43   void PutCurrentFrame();
  44   void ReleaseLock();
  45   bool HasCurrentFrame();
  46
  47   const gfx::Transform& StreamTextureMatrix() const;
  48
  49   // VideoFrameController implementation.
  50   void OnBeginFrame(const BeginFrameArgs& args) override;
  51
  52   // VideoFrameProvider::Client implementation.
  53   // Called on the main thread.
  54   void StopUsingProvider() override;
  55   // Called on the impl thread.
  56   void StartRendering() override;
  57   void StopRendering() override;
  58   void DidReceiveFrame() override;
  59   void DidUpdateMatrix(const float* matrix) override;
  60
  61  private:
  62   friend class base::RefCounted<VideoFrameProviderClientImpl>;
  63
  64   VideoFrameProviderClientImpl(VideoFrameProvider* provider,
  65                                VideoFrameControllerClient* client);
  66   ~VideoFrameProviderClientImpl() override;
  67
  68   VideoFrameProvider* provider_;
  69   VideoFrameControllerClient* client_;
  70   VideoLayerImpl* active_video_layer_;
  71   bool stopped_;
  72   bool rendering_;
  73
  74   // Since the provider lives on another thread, it can be destroyed while the
  75   // frame controller are accessing its frame. Before being destroyed the
  76   // provider calls StopUsingProvider. provider_lock_ blocks StopUsingProvider
  77   // from returning until the frame controller is done using the frame.
  78   base::Lock provider_lock_;
  79   base::ThreadChecker thread_checker_;
  80
  81   gfx::Transform stream_texture_matrix_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(VideoFrameProviderClientImpl);
  84 };
  85
  86 }  // namespace cc
  87
  88 #endif  // CC_LAYERS_VIDEO_FRAME_PROVIDER_CLIENT_IMPL_H_