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 // VideoCaptureHost serves video capture related messages from 6 // VideoCaptureMessageFilter which lives inside the render process. 7 // 8 // This class is owned by BrowserRenderProcessHost, and instantiated on UI 9 // thread, but all other operations and method calls happen on IO thread. 10 // 11 // Here's an example of a typical IPC dialog for video capture: 12 // 13 // Renderer VideoCaptureHost 14 // | | 15 // | VideoCaptureHostMsg_Start > | 16 // | < VideoCaptureMsg_DeviceInfo | 17 // | | 18 // | < VideoCaptureMsg_StateChanged | 19 // | (kStarted) | 20 // | < VideoCaptureMsg_BufferReady | 21 // | ... | 22 // | < VideoCaptureMsg_BufferReady | 23 // | ... | 24 // | VideoCaptureHostMsg_BufferReady > | 25 // | VideoCaptureHostMsg_BufferReady > | 26 // | | 27 // | ... | 28 // | | 29 // | < VideoCaptureMsg_BufferReady | 30 // | VideoCaptureHostMsg_Stop > | 31 // | VideoCaptureHostMsg_BufferReady > | 32 // | < VideoCaptureMsg_StateChanged | 33 // | (kStopped) | 34 // v v 35 36 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_HOST_H_ 37 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_HOST_H_ 38 39 #include <map> 40 41 #include "base/memory/ref_counted.h" 42 #include "base/sequenced_task_runner_helpers.h" 43 #include "content/browser/renderer_host/media/video_capture_controller.h" 44 #include "content/common/content_export.h" 45 #include "content/public/browser/browser_message_filter.h" 46 #include "ipc/ipc_message.h" 47 48 namespace media { 49 struct VideoCaptureCapability; 50 } 51 52 namespace content { 53 class MediaStreamManager; 54 55 class CONTENT_EXPORT VideoCaptureHost 56 : public BrowserMessageFilter, 57 public VideoCaptureControllerEventHandler { 58 public: 59 explicit VideoCaptureHost(MediaStreamManager* media_stream_manager); 60 61 // BrowserMessageFilter implementation. 62 virtual void OnChannelClosing() OVERRIDE; 63 virtual void OnDestruct() const OVERRIDE; 64 virtual bool OnMessageReceived(const IPC::Message& message, 65 bool* message_was_ok) OVERRIDE; 66 67 // VideoCaptureControllerEventHandler implementation. 68 virtual void OnError(const VideoCaptureControllerID& id) OVERRIDE; 69 virtual void OnBufferCreated(const VideoCaptureControllerID& id, 70 base::SharedMemoryHandle handle, 71 int length, int buffer_id) OVERRIDE; 72 virtual void OnBufferReady(const VideoCaptureControllerID& id, 73 int buffer_id, 74 base::Time timestamp) OVERRIDE; 75 virtual void OnFrameInfo( 76 const VideoCaptureControllerID& id, 77 const media::VideoCaptureCapability& format) OVERRIDE; 78 virtual void OnFrameInfoChanged(const VideoCaptureControllerID& id, 79 int width, 80 int height, 81 int frame_per_second) OVERRIDE; 82 virtual void OnEnded(const VideoCaptureControllerID& id) OVERRIDE; 83 84 private: 85 friend class BrowserThread; 86 friend class base::DeleteHelper<VideoCaptureHost>; 87 friend class MockVideoCaptureHost; 88 friend class VideoCaptureHostTest; 89 90 virtual ~VideoCaptureHost(); 91 92 // IPC message: Start capture on the VideoCaptureDevice referenced by 93 // VideoCaptureParams::session_id. |device_id| is an id created by 94 // VideoCaptureMessageFilter to identify a session 95 // between a VideoCaptureMessageFilter and a VideoCaptureHost. 96 void OnStartCapture(int device_id, 97 const media::VideoCaptureParams& params); 98 void OnControllerAdded( 99 int device_id, const media::VideoCaptureParams& params, 100 VideoCaptureController* controller); 101 void DoControllerAddedOnIOThread( 102 int device_id, const media::VideoCaptureParams params, 103 VideoCaptureController* controller); 104 105 // IPC message: Stop capture on device referenced by |device_id|. 106 void OnStopCapture(int device_id); 107 108 // IPC message: Pause capture on device referenced by |device_id|. 109 void OnPauseCapture(int device_id); 110 111 // IPC message: Receive an empty buffer from renderer. Send it to device 112 // referenced by |device_id|. 113 void OnReceiveEmptyBuffer(int device_id, int buffer_id); 114 115 // Send a newly created buffer to the VideoCaptureMessageFilter. 116 void DoSendNewBufferOnIOThread( 117 const VideoCaptureControllerID& controller_id, 118 base::SharedMemoryHandle handle, 119 int length, 120 int buffer_id); 121 122 // Send a filled buffer to the VideoCaptureMessageFilter. 123 void DoSendFilledBufferOnIOThread( 124 const VideoCaptureControllerID& controller_id, 125 int buffer_id, 126 base::Time timestamp); 127 128 // Send information about the capture parameters (resolution, frame rate etc) 129 // to the VideoCaptureMessageFilter. 130 void DoSendFrameInfoOnIOThread(const VideoCaptureControllerID& controller_id, 131 const media::VideoCaptureCapability& format); 132 133 // Send newly changed information about frame resolution and frame rate 134 // to the VideoCaptureMessageFilter. 135 void DoSendFrameInfoChangedOnIOThread( 136 const VideoCaptureControllerID& controller_id, 137 int width, 138 int height, 139 int frame_per_second); 140 141 // Handle error coming from VideoCaptureDevice. 142 void DoHandleErrorOnIOThread(const VideoCaptureControllerID& controller_id); 143 144 void DoEndedOnIOThread(const VideoCaptureControllerID& controller_id); 145 146 void DeleteVideoCaptureControllerOnIOThread( 147 const VideoCaptureControllerID& controller_id); 148 149 MediaStreamManager* media_stream_manager_; 150 151 struct Entry; 152 typedef std::map<VideoCaptureControllerID, Entry*> EntryMap; 153 // A map of VideoCaptureControllerID to its state and VideoCaptureController. 154 EntryMap entries_; 155 156 DISALLOW_COPY_AND_ASSIGN(VideoCaptureHost); 157 }; 158 159 } // namespace content 160 161 #endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_HOST_H_ 162
