Add VideoCaptureImpl

content/renderer/media/video_capture_impl.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// VideoCaptureImpl represents a capture device in renderer process. It provides
+// interfaces for clients to Start/Stop capture. It also communicates to clients
+// when buffer is ready, state of capture device is changed.
+
+#ifndef CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
+#define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
+
+#include <list>
+#include <map>
+
+#include "content/renderer/video_capture_message_filter.h"
+#include "media/base/callback.h"
+#include "media/video/capture/video_capture.h"
+#include "ui/gfx/surface/transport_dib.h"
+
+namespace base {
+class MessageLoopProxy;
+}
+
+class VideoCaptureImpl
+    : public media::VideoCapture,
+      public VideoCaptureMessageFilter::Delegate {
+ public:
+  // media::VideoCapture interface.
+  virtual void StartCapture(media::VideoCapture::EventHandler* handler,
+                            const VideoCaptureCapability& capability);
+  virtual void StopCapture(media::VideoCapture::EventHandler* handler);
+  virtual bool CaptureStarted();
+  virtual int CaptureWidth();
+  virtual int CaptureHeight();
+  virtual int CaptureFrameRate();
+
+  // VideoCaptureMessageFilter::Delegate interface.
+  virtual void OnBufferReceived(TransportDIB::Handle handle,
+                                base::Time timestamp);
+  virtual void OnStateChanged(const media::VideoCapture::State& state);
+  virtual void OnDeviceInfoReceived(
+      const media::VideoCaptureParams& device_info);
+  virtual void OnDelegateAdded(int32 device_id);
+
+  bool pending_start() {
+    return (new_width_ > 0 && new_height_ > 0);
+  }
+
+ private:
+  friend class VideoCaptureImplManager;
+  friend class VideoCaptureImplTest;
+
+  enum State {
+    kStarted,
+    kStopping,
+    kStopped
+  };
+
+  struct DIBBuffer {
+   public:
+    DIBBuffer(TransportDIB* d, media::VideoCapture::VideoFrameBuffer* ptr);
+    ~DIBBuffer();
+
+    TransportDIB* dib;
+    scoped_refptr<media::VideoCapture::VideoFrameBuffer> mapped_memory;
+  };
+
+  VideoCaptureImpl(media::VideoCaptureSessionId id,
+                   scoped_refptr<base::MessageLoopProxy> ml_proxy,
+                   VideoCaptureMessageFilter* filter);
+  virtual ~VideoCaptureImpl();
+
+  void Init();
+  void DeInit(Task* task);
+  void StopDevice();
+  void RestartCapture();
+  void StartCaptureInternal();
+  void AddDelegateOnIOThread();
+  void RemoveDelegateOnIOThread(Task* task);
+
+  scoped_refptr<VideoCaptureMessageFilter> message_filter_;
+  media::VideoCaptureSessionId session_id_;
+  scoped_refptr<base::MessageLoopProxy> ml_proxy_;
+  int device_id_;
+
+  // Pool of DIBs.
+  typedef std::list<DIBBuffer*> CachedDIB;
+  CachedDIB cached_dibs_;
+
+  typedef std::map<media::VideoCapture::EventHandler*, VideoCaptureCapability>
+      ClientInfo;
+  ClientInfo clients_;
+  std::list<media::VideoCapture::EventHandler*> master_clients_;
+
+  ClientInfo pending_clients_;
+
+  int width_;
+  int height_;
+  int frame_rate_;
+  media::VideoFrame::Format video_type_;
+
+  int new_width_;
+  int new_height_;
+  State state_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoCaptureImpl);
+};
+
+DISABLE_RUNNABLE_METHOD_REFCOUNT(VideoCaptureImpl);
+
+#endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_