remoting/client/software_video_renderer.h

   1 // Copyright 2014 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 REMOTING_CLIENT_SOFTWARE_VIDEO_RENDERER_H_
   6 #define REMOTING_CLIENT_SOFTWARE_VIDEO_RENDERER_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "remoting/client/chromoting_stats.h"
  11 #include "remoting/client/frame_consumer_proxy.h"
  12 #include "remoting/client/frame_producer.h"
  13 #include "remoting/client/video_renderer.h"
  14 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
  15
  16 namespace base {
  17 class SingleThreadTaskRunner;
  18 }  // namespace base
  19
  20 namespace remoting {
  21
  22 class ChromotingStats;
  23
  24 // Implementation of VideoRenderer interface that decodes frame on CPU (on a
  25 // decode thread) and then passes decoded frames to a FrameConsumer.
  26 // FrameProducer methods can be called on any thread. All other methods must be
  27 // called on the main thread. Owned must ensure that this class outlives
  28 // FrameConsumer (which calls FrameProducer interface).
  29 class SoftwareVideoRenderer : public VideoRenderer,
  30                               public FrameProducer,
  31                               public base::NonThreadSafe {
  32  public:
  33   // Creates an update decoder on |main_task_runner_| and |decode_task_runner_|,
  34   // outputting to |consumer|. The |main_task_runner_| is responsible for
  35   // receiving and queueing packets. The |decode_task_runner_| is responsible
  36   // for decoding the video packets.
  37   // TODO(wez): Replace the ref-counted proxy with an owned FrameConsumer.
  38   SoftwareVideoRenderer(
  39       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
  40       scoped_refptr<base::SingleThreadTaskRunner> decode_task_runner,
  41       scoped_refptr<FrameConsumerProxy> consumer);
  42   ~SoftwareVideoRenderer() override;
  43
  44   // VideoRenderer implementation.
  45   void Initialize(const protocol::SessionConfig& config) override;
  46   ChromotingStats* GetStats() override;
  47   void ProcessVideoPacket(scoped_ptr<VideoPacket> packet,
  48                           const base::Closure& done) override;
  49
  50   // FrameProducer implementation. These methods may be called before we are
  51   // Initialize()d, or we know the source screen size. These methods may be
  52   // called on any thread.
  53   //
  54   // TODO(sergeyu): On Android a separate display thread is used for drawing.
  55   // FrameConsumer calls FrameProducer on that thread. Can we avoid having a
  56   // separate display thread? E.g. can we do everything on the decode thread?
  57   void DrawBuffer(webrtc::DesktopFrame* buffer) override;
  58   void InvalidateRegion(const webrtc::DesktopRegion& region) override;
  59   void RequestReturnBuffers(const base::Closure& done) override;
  60   void SetOutputSizeAndClip(const webrtc::DesktopSize& view_size,
  61                             const webrtc::DesktopRect& clip_area) override;
  62
  63  private:
  64   class Core;
  65
  66   // Callback method when a VideoPacket is processed. |decode_start| contains
  67   // the timestamp when the packet will start to be processed.
  68   void OnPacketDone(base::Time decode_start, const base::Closure& done);
  69
  70   scoped_refptr<base::SingleThreadTaskRunner> decode_task_runner_;
  71   scoped_ptr<Core> core_;
  72
  73   ChromotingStats stats_;
  74
  75   // Keep track of the most recent sequence number bounced back from the host.
  76   int64 latest_sequence_number_;
  77
  78   base::WeakPtrFactory<SoftwareVideoRenderer> weak_factory_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(SoftwareVideoRenderer);
  81 };
  82
  83 }  // namespace remoting
  84
  85 #endif  // REMOTING_CLIENT_SOFTWARE_VIDEO_RENDERER_H_