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      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 "content/common/content_export.h"
     13 #include "content/renderer/media/video_source_handler.h"
     14 #include "ppapi/c/pp_time.h"
     15 #include "ppapi/host/host_message_context.h"
     16 #include "ppapi/host/resource_host.h"
     17 
     18 struct PP_ImageDataDesc;
     19 
     20 namespace content {
     21 
     22 class RendererPpapiHost;
     23 
     24 class CONTENT_EXPORT PepperVideoSourceHost : public ppapi::host::ResourceHost {
     25  public:
     26   PepperVideoSourceHost(RendererPpapiHost* host,
     27                         PP_Instance instance,
     28                         PP_Resource resource);
     29 
     30   virtual ~PepperVideoSourceHost();
     31 
     32   virtual int32_t OnResourceMessageReceived(
     33       const IPC::Message& msg,
     34       ppapi::host::HostMessageContext* context) OVERRIDE;
     35 
     36  private:
     37   // This helper object receives frames on a video worker thread and passes
     38   // them on to us.
     39   class FrameReceiver : public FrameReaderInterface,
     40                         public base::RefCountedThreadSafe<FrameReceiver> {
     41    public:
     42     explicit FrameReceiver(const base::WeakPtr<PepperVideoSourceHost>& host);
     43 
     44     // FrameReaderInterface implementation.
     45     virtual bool GotFrame(cricket::VideoFrame* frame) OVERRIDE;
     46 
     47     void OnGotFrame(scoped_ptr<cricket::VideoFrame> frame);
     48 
     49    private:
     50     friend class base::RefCountedThreadSafe<FrameReceiver>;
     51     virtual ~FrameReceiver();
     52 
     53     base::WeakPtr<PepperVideoSourceHost> host_;
     54     scoped_refptr<base::MessageLoopProxy> main_message_loop_proxy_;
     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_ptr<cricket::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_
     90