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