content/renderer/pepper/pepper_video_source_host.h

   1 // Copyright (c) 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 CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_SOURCE_HOST_H_
   6 #define CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_SOURCE_HOST_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/threading/thread_checker.h"
  13 #include "content/common/content_export.h"
  14 #include "content/renderer/media/video_source_handler.h"
  15 #include "ppapi/c/pp_time.h"
  16 #include "ppapi/host/host_message_context.h"
  17 #include "ppapi/host/resource_host.h"
  18
  19 struct PP_ImageDataDesc;
  20
  21 namespace content {
  22
  23 class RendererPpapiHost;
  24
  25 class CONTENT_EXPORT PepperVideoSourceHost : public ppapi::host::ResourceHost {
  26  public:
  27   PepperVideoSourceHost(RendererPpapiHost* host,
  28                         PP_Instance instance,
  29                         PP_Resource resource);
  30
  31   ~PepperVideoSourceHost() override;
  32
  33   int32_t OnResourceMessageReceived(
  34       const IPC::Message& msg,
  35       ppapi::host::HostMessageContext* context) override;
  36
  37  private:
  38   // This helper object receives frames on a video worker thread and passes
  39   // them on to us.
  40   class FrameReceiver : public FrameReaderInterface,
  41                         public base::RefCountedThreadSafe<FrameReceiver> {
  42    public:
  43     explicit FrameReceiver(const base::WeakPtr<PepperVideoSourceHost>& host);
  44
  45     // FrameReaderInterface implementation.
  46     void GotFrame(const scoped_refptr<media::VideoFrame>& frame) override;
  47
  48    private:
  49     friend class base::RefCountedThreadSafe<FrameReceiver>;
  50     ~FrameReceiver() override;
  51
  52     base::WeakPtr<PepperVideoSourceHost> host_;
  53     // |thread_checker_| is bound to the main render thread.
  54     base::ThreadChecker thread_checker_;
  55   };
  56
  57   friend class FrameReceiver;
  58
  59   int32_t OnHostMsgOpen(ppapi::host::HostMessageContext* context,
  60                         const std::string& stream_url);
  61   int32_t OnHostMsgGetFrame(ppapi::host::HostMessageContext* context);
  62   int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context);
  63
  64   // Sends the reply to a GetFrame message from the plugin. A reply is always
  65   // sent and last_frame_, reply_context_, and get_frame_pending_ are all reset.
  66   void SendGetFrameReply();
  67   // Sends the reply to a GetFrame message from the plugin in case of an error.
  68   void SendGetFrameErrorReply(int32_t error);
  69
  70   void Close();
  71
  72   RendererPpapiHost* renderer_ppapi_host_;
  73
  74   ppapi::host::ReplyMessageContext reply_context_;
  75
  76   scoped_ptr<VideoSourceHandler> source_handler_;
  77   scoped_refptr<FrameReceiver> frame_receiver_;
  78   std::string stream_url_;
  79   scoped_refptr<media::VideoFrame> last_frame_;
  80   bool get_frame_pending_;
  81
  82   base::WeakPtrFactory<PepperVideoSourceHost> weak_factory_;
  83
  84   DISALLOW_COPY_AND_ASSIGN(PepperVideoSourceHost);
  85 };
  86
  87 }  // namespace content
  88
  89 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_SOURCE_HOST_H_