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_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_ 6 #define CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_ 7 8 #include <string> 9 10 #include "base/memory/scoped_ptr.h" 11 #include "content/common/content_export.h" 12 #include "media/video/capture/video_capture_device.h" 13 14 namespace content { 15 16 class ContentVideoCaptureDeviceCore; 17 18 // A virtualized VideoCaptureDevice that mirrors the displayed contents of a 19 // WebContents (i.e., the composition of an entire render frame tree), producing 20 // a stream of video frames. 21 // 22 // An instance is created by providing a device_id. The device_id contains 23 // information necessary for finding a WebContents instance. From then on, 24 // WebContentsVideoCaptureDevice will capture from the RenderWidgetHost that 25 // encompasses the currently active RenderFrameHost tree for that that 26 // WebContents instance. As the RenderFrameHost tree mutates (e.g., due to page 27 // navigations, or crashes/reloads), capture will continue without interruption. 28 class CONTENT_EXPORT WebContentsVideoCaptureDevice 29 : public media::VideoCaptureDevice { 30 public: 31 // Create a WebContentsVideoCaptureDevice instance from the given 32 // |device_id|. Returns NULL if |device_id| is invalid. 33 static media::VideoCaptureDevice* Create(const std::string& device_id); 34 35 virtual ~WebContentsVideoCaptureDevice(); 36 37 // VideoCaptureDevice implementation. 38 virtual void AllocateAndStart(const media::VideoCaptureParams& params, 39 scoped_ptr<Client> client) OVERRIDE; 40 virtual void StopAndDeAllocate() OVERRIDE; 41 42 private: 43 WebContentsVideoCaptureDevice( 44 int render_process_id, int main_render_frame_id); 45 46 const scoped_ptr<ContentVideoCaptureDeviceCore> core_; 47 48 DISALLOW_COPY_AND_ASSIGN(WebContentsVideoCaptureDevice); 49 }; 50 51 52 } // namespace content 53 54 #endif // CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_ 55
