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 "ppapi/c/pp_time.h"
  15 #include "ppapi/c/ppb_image_data.h"
  16 #include "ppapi/host/host_message_context.h"
  17 #include "ppapi/host/resource_host.h"
  18
  19 struct PP_ImageDataDesc;
  20
  21 namespace media {
  22 class VideoFrame;
  23 }  // namespace media
  24
  25 namespace content {
  26
  27 class PPB_ImageData_Impl;
  28 class RendererPpapiHost;
  29 class VideoTrackToPepperAdapter;
  30
  31 class CONTENT_EXPORT PepperVideoSourceHost : public ppapi::host::ResourceHost {
  32  public:
  33   PepperVideoSourceHost(RendererPpapiHost* host,
  34                         PP_Instance instance,
  35                         PP_Resource resource);
  36
  37   ~PepperVideoSourceHost() override;
  38
  39   int32_t OnResourceMessageReceived(
  40       const IPC::Message& msg,
  41       ppapi::host::HostMessageContext* context) override;
  42
  43  private:
  44   // Helper object to receive frames on a video worker thread and pass them on
  45   // to us.
  46   class FrameReceiver;
  47
  48   int32_t OnHostMsgOpen(ppapi::host::HostMessageContext* context,
  49                         const std::string& stream_url);
  50   int32_t OnHostMsgGetFrame(ppapi::host::HostMessageContext* context);
  51   int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context);
  52
  53   // Sends the reply to a GetFrame message from the plugin. A reply is always
  54   // sent and last_frame_, reply_context_, and get_frame_pending_ are all reset.
  55   void SendGetFrameReply();
  56   // Sends the reply to a GetFrame message from the plugin in case of an error.
  57   void SendGetFrameErrorReply(int32_t error);
  58
  59   void Close();
  60
  61   ppapi::host::ReplyMessageContext reply_context_;
  62
  63   scoped_ptr<VideoTrackToPepperAdapter> frame_source_;
  64   scoped_refptr<FrameReceiver> frame_receiver_;
  65   std::string stream_url_;
  66   scoped_refptr<media::VideoFrame> last_frame_;
  67   // An internal frame buffer to avoid reallocations. It is only allocated if
  68   // scaling is needed.
  69   scoped_refptr<media::VideoFrame> scaled_frame_;
  70   bool get_frame_pending_;
  71   // We use only one ImageData resource in order to avoid allocating
  72   // shared memory repeatedly. We send the same one each time the plugin
  73   // requests a frame. For this to work, the plugin must finish using
  74   // the ImageData it receives prior to calling GetFrame, and not access
  75   // the ImageData until it gets its next callback to GetFrame.
  76   scoped_refptr<PPB_ImageData_Impl> shared_image_;
  77   PP_ImageDataDesc shared_image_desc_;
  78
  79   base::WeakPtrFactory<PepperVideoSourceHost> weak_factory_;
  80
  81   DISALLOW_COPY_AND_ASSIGN(PepperVideoSourceHost);
  82 };
  83
  84 }  // namespace content
  85
  86 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_SOURCE_HOST_H_