content/browser/renderer_host/media/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 // VideoCaptureHost serves video capture related messages from
   6 // VideoCaptureMessageFilter which lives inside the render process.
   7 //
   8 // This class is owned by RenderProcessHostImpl, 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_StateChanged         |
  17 //      |        (VIDEO_CAPTURE_STATE_STARTED)   |
  18 //      | < VideoCaptureMsg_NewBuffer(1)         |
  19 //      | < VideoCaptureMsg_NewBuffer(2)         |
  20 //      | < VideoCaptureMsg_NewBuffer(3)         |
  21 //      |                                        |
  22 //      | < VideoCaptureMsg_BufferReady(1)       |
  23 //      | < VideoCaptureMsg_BufferReady(2)       |
  24 //      | VideoCaptureHostMsg_BufferReady(1) >   |
  25 //      | < VideoCaptureMsg_BufferReady(3)       |
  26 //      | VideoCaptureHostMsg_BufferReady(2) >   |
  27 //      | < VideoCaptureMsg_BufferReady(1)       |
  28 //      | VideoCaptureHostMsg_BufferReady(3) >   |
  29 //      | < VideoCaptureMsg_BufferReady(2)       |
  30 //      | VideoCaptureHostMsg_BufferReady(1) >   |
  31 //      |             ...                        |
  32 //      | < VideoCaptureMsg_BufferReady(3)       |
  33 //      |                                        |
  34 //      |             ... (resolution change)    |
  35 //      | < VideoCaptureMsg_FreeBuffer(1)        |  Buffers are re-allocated
  36 //      | < VideoCaptureMsg_NewBuffer(4)         |  at a larger size, as
  37 //      | < VideoCaptureMsg_BufferReady(4)       |  needed.
  38 //      | VideoCaptureHostMsg_BufferReady(2) >   |
  39 //      | < VideoCaptureMsg_FreeBuffer(2)        |
  40 //      | < VideoCaptureMsg_NewBuffer(5)         |
  41 //      | < VideoCaptureMsg_BufferReady(5)       |
  42 //      |             ...                        |
  43 //      |                                        |
  44 //      | < VideoCaptureMsg_BufferReady          |
  45 //      | VideoCaptureHostMsg_Stop >             |
  46 //      | VideoCaptureHostMsg_BufferReady >      |
  47 //      | < VideoCaptureMsg_StateChanged         |
  48 //      |         (VIDEO_CAPTURE_STATE_STOPPED)  |
  49 //      v                                        v
  50
  51 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_HOST_H_
  52 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_HOST_H_
  53
  54 #include <map>
  55
  56 #include "base/memory/ref_counted.h"
  57 #include "base/memory/weak_ptr.h"
  58 #include "base/sequenced_task_runner_helpers.h"
  59 #include "content/browser/renderer_host/media/video_capture_controller.h"
  60 #include "content/common/content_export.h"
  61 #include "content/public/browser/browser_message_filter.h"
  62 #include "ipc/ipc_message.h"
  63
  64 namespace content {
  65 class MediaStreamManager;
  66
  67 class CONTENT_EXPORT VideoCaptureHost
  68     : public BrowserMessageFilter,
  69       public VideoCaptureControllerEventHandler {
  70  public:
  71   explicit VideoCaptureHost(MediaStreamManager* media_stream_manager);
  72
  73   // BrowserMessageFilter implementation.
  74   virtual void OnChannelClosing() OVERRIDE;
  75   virtual void OnDestruct() const OVERRIDE;
  76   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  77
  78   // VideoCaptureControllerEventHandler implementation.
  79   virtual void OnError(const VideoCaptureControllerID& id) OVERRIDE;
  80   virtual void OnBufferCreated(const VideoCaptureControllerID& id,
  81                                base::SharedMemoryHandle handle,
  82                                int length,
  83                                int buffer_id) OVERRIDE;
  84   virtual void OnBufferDestroyed(const VideoCaptureControllerID& id,
  85                                  int buffer_id) OVERRIDE;
  86   virtual void OnBufferReady(const VideoCaptureControllerID& id,
  87                              int buffer_id,
  88                              const media::VideoCaptureFormat& format,
  89                              base::TimeTicks timestamp) OVERRIDE;
  90   virtual void OnMailboxBufferReady(const VideoCaptureControllerID& id,
  91                                     int buffer_id,
  92                                     const gpu::MailboxHolder& mailbox_holder,
  93                                     const media::VideoCaptureFormat& format,
  94                                     base::TimeTicks timestamp) OVERRIDE;
  95   virtual void OnEnded(const VideoCaptureControllerID& id) OVERRIDE;
  96
  97  private:
  98   friend class BrowserThread;
  99   friend class base::DeleteHelper<VideoCaptureHost>;
 100   friend class MockVideoCaptureHost;
 101   friend class VideoCaptureHostTest;
 102
 103   virtual ~VideoCaptureHost();
 104
 105   // IPC message: Start capture on the VideoCaptureDevice referenced by
 106   // |session_id|. |device_id| is an id created by VideoCaptureMessageFilter
 107   // to identify a session between a VideoCaptureMessageFilter and a
 108   // VideoCaptureHost.
 109   void OnStartCapture(int device_id,
 110                       media::VideoCaptureSessionId session_id,
 111                       const media::VideoCaptureParams& params);
 112   void OnControllerAdded(
 113       int device_id,
 114       const base::WeakPtr<VideoCaptureController>& controller);
 115   void DoControllerAddedOnIOThread(
 116       int device_id,
 117       const base::WeakPtr<VideoCaptureController>& controller);
 118
 119   // IPC message: Stop capture on device referenced by |device_id|.
 120   void OnStopCapture(int device_id);
 121
 122   // IPC message: Pause capture on device referenced by |device_id|.
 123   void OnPauseCapture(int device_id);
 124
 125   // IPC message: Receive an empty buffer from renderer. Send it to device
 126   // referenced by |device_id|.
 127   void OnReceiveEmptyBuffer(int device_id, int buffer_id, uint32 sync_point);
 128
 129   // IPC message: Get supported formats referenced by |capture_session_id|.
 130   // |device_id| is needed for message back-routing purposes.
 131   void OnGetDeviceSupportedFormats(
 132       int device_id,
 133       media::VideoCaptureSessionId capture_session_id);
 134
 135   // IPC message: Get a device's currently in use format(s), referenced by
 136   // |capture_session_id|. |device_id| is needed for message back-routing
 137   // purposes.
 138   void OnGetDeviceFormatsInUse(
 139       int device_id,
 140       media::VideoCaptureSessionId capture_session_id);
 141
 142   // Sends a newly created buffer to the VideoCaptureMessageFilter.
 143   void DoSendNewBufferOnIOThread(
 144       const VideoCaptureControllerID& controller_id,
 145       base::SharedMemoryHandle handle,
 146       int length,
 147       int buffer_id);
 148
 149   void DoSendFreeBufferOnIOThread(
 150       const VideoCaptureControllerID& controller_id,
 151       int buffer_id);
 152
 153   // Sends a filled buffer to the VideoCaptureMessageFilter.
 154   void DoSendFilledBufferOnIOThread(
 155       const VideoCaptureControllerID& controller_id,
 156       int buffer_id,
 157       const media::VideoCaptureFormat& format,
 158       base::TimeTicks timestamp);
 159
 160   // Sends a filled texture mailbox buffer to the VideoCaptureMessageFilter.
 161   void DoSendFilledMailboxBufferOnIOThread(
 162       const VideoCaptureControllerID& controller_id,
 163       int buffer_id,
 164       const gpu::MailboxHolder& mailbox_holder,
 165       const media::VideoCaptureFormat& format,
 166       base::TimeTicks timestamp);
 167
 168   // Handles error coming from VideoCaptureDevice.
 169   void DoHandleErrorOnIOThread(const VideoCaptureControllerID& controller_id);
 170
 171   void DoEndedOnIOThread(const VideoCaptureControllerID& controller_id);
 172
 173   // Deletes the controller and notifies the VideoCaptureManager. |on_error| is
 174   // true if this is triggered by VideoCaptureControllerEventHandler::OnError.
 175   void DeleteVideoCaptureControllerOnIOThread(
 176       const VideoCaptureControllerID& controller_id, bool on_error);
 177
 178   MediaStreamManager* media_stream_manager_;
 179
 180   typedef std::map<VideoCaptureControllerID,
 181                    base::WeakPtr<VideoCaptureController> > EntryMap;
 182
 183   // A map of VideoCaptureControllerID to the VideoCaptureController to which it
 184   // is connected. An entry in this map holds a null controller while it is in
 185   // the process of starting.
 186   EntryMap entries_;
 187
 188   DISALLOW_COPY_AND_ASSIGN(VideoCaptureHost);
 189 };
 190
 191 }  // namespace content
 192
 193 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_HOST_H_