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      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_
    122