content/renderer/pepper/pepper_video_capture_host.h

   1 // Copyright (c) 2012 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_CAPTURE_HOST_H_
   6 #define CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_CAPTURE_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 "content/common/media/video_capture.h"
  12 #include "content/public/renderer/renderer_ppapi_host.h"
  13 #include "content/renderer/pepper/pepper_device_enumeration_host_helper.h"
  14 #include "content/renderer/pepper/ppb_buffer_impl.h"
  15 #include "media/video/capture/video_capture_types.h"
  16 #include "ppapi/c/dev/ppp_video_capture_dev.h"
  17 #include "ppapi/host/host_message_context.h"
  18 #include "ppapi/host/resource_host.h"
  19
  20 namespace media {
  21 class VideoFrame;
  22 }  // namespace media
  23
  24 namespace content {
  25 class PepperPlatformVideoCapture;
  26 class RendererPpapiHostImpl;
  27
  28 class PepperVideoCaptureHost : public ppapi::host::ResourceHost {
  29  public:
  30   PepperVideoCaptureHost(RendererPpapiHostImpl* host,
  31                          PP_Instance instance,
  32                          PP_Resource resource);
  33
  34   virtual ~PepperVideoCaptureHost();
  35
  36   bool Init();
  37
  38   virtual int32_t OnResourceMessageReceived(
  39       const IPC::Message& msg,
  40       ppapi::host::HostMessageContext* context) OVERRIDE;
  41
  42   // These methods are called by PepperPlatformVideoCapture only.
  43
  44   // Called when video capture is initialized. We can start
  45   // video capture if |succeeded| is true.
  46   void OnInitialized(bool succeeded);
  47
  48   // Called when video capture has started successfully.
  49   void OnStarted();
  50
  51   // Called when video capture has stopped. There will be no more
  52   // frames delivered.
  53   void OnStopped();
  54
  55   // Called when video capture has paused.
  56   void OnPaused();
  57
  58   // Called when video capture cannot be started because of an error.
  59   void OnError();
  60
  61   // Called when a video frame is ready.
  62   void OnFrameReady(const scoped_refptr<media::VideoFrame>& frame,
  63                     media::VideoCaptureFormat format);
  64
  65  private:
  66   int32_t OnOpen(ppapi::host::HostMessageContext* context,
  67                  const std::string& device_id,
  68                  const PP_VideoCaptureDeviceInfo_Dev& requested_info,
  69                  uint32_t buffer_count);
  70   int32_t OnStartCapture(ppapi::host::HostMessageContext* context);
  71   int32_t OnReuseBuffer(ppapi::host::HostMessageContext* context,
  72                         uint32_t buffer);
  73   int32_t OnStopCapture(ppapi::host::HostMessageContext* context);
  74   int32_t OnClose(ppapi::host::HostMessageContext* context);
  75
  76   int32_t StopCapture();
  77   int32_t Close();
  78   void PostErrorReply();
  79   void AllocBuffers(const gfx::Size& resolution, int frame_rate);
  80   void ReleaseBuffers();
  81   void SendStatus();
  82
  83   void SetRequestedInfo(const PP_VideoCaptureDeviceInfo_Dev& device_info,
  84                         uint32_t buffer_count);
  85
  86   void DetachPlatformVideoCapture();
  87
  88   bool SetStatus(PP_VideoCaptureStatus_Dev status, bool forced);
  89
  90   scoped_ptr<PepperPlatformVideoCapture> platform_video_capture_;
  91
  92   // Buffers of video frame.
  93   struct BufferInfo {
  94     BufferInfo();
  95     ~BufferInfo();
  96
  97     bool in_use;
  98     void* data;
  99     scoped_refptr<PPB_Buffer_Impl> buffer;
 100   };
 101
 102   RendererPpapiHostImpl* renderer_ppapi_host_;
 103
 104   gfx::Size alloc_size_;
 105   std::vector<BufferInfo> buffers_;
 106   size_t buffer_count_hint_;
 107
 108   media::VideoCaptureParams video_capture_params_;
 109
 110   PP_VideoCaptureStatus_Dev status_;
 111
 112   ppapi::host::ReplyMessageContext open_reply_context_;
 113
 114   PepperDeviceEnumerationHostHelper enumeration_helper_;
 115
 116   DISALLOW_COPY_AND_ASSIGN(PepperVideoCaptureHost);
 117 };
 118
 119 }  // namespace content
 120
 121 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_CAPTURE_HOST_H_