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)         |  with 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/browser/renderer_host/media/video_capture_controller_event_handler.h"
  61 #include "content/common/content_export.h"
  62 #include "content/public/browser/browser_message_filter.h"
  63 #include "ipc/ipc_message.h"
  64
  65 namespace content {
  66 class MediaStreamManager;
  67
  68 class CONTENT_EXPORT VideoCaptureHost
  69     : public BrowserMessageFilter,
  70       public VideoCaptureControllerEventHandler {
  71  public:
  72   explicit VideoCaptureHost(MediaStreamManager* media_stream_manager);
  73
  74   // BrowserMessageFilter implementation.
  75   void OnChannelClosing() override;
  76   void OnDestruct() const override;
  77   bool OnMessageReceived(const IPC::Message& message) override;
  78
  79   // VideoCaptureControllerEventHandler implementation.
  80   void OnError(VideoCaptureControllerID id) override;
  81   void OnBufferCreated(VideoCaptureControllerID id,
  82                        base::SharedMemoryHandle handle,
  83                        int length,
  84                        int buffer_id) override;
  85   void OnBufferDestroyed(VideoCaptureControllerID id,
  86                          int buffer_id) override;
  87   void OnBufferReady(VideoCaptureControllerID id,
  88                      int buffer_id,
  89                      const gfx::Size& coded_size,
  90                      const gfx::Rect& visible_rect,
  91                      const base::TimeTicks& timestamp,
  92                      scoped_ptr<base::DictionaryValue> metadata) override;
  93   void OnMailboxBufferReady(
  94       VideoCaptureControllerID id,
  95       int buffer_id,
  96       const gpu::MailboxHolder& mailbox_holder,
  97       const gfx::Size& packed_frame_size,
  98       const base::TimeTicks& timestamp,
  99       scoped_ptr<base::DictionaryValue> metadata) override;
 100   void OnEnded(VideoCaptureControllerID id) override;
 101
 102  private:
 103   friend class BrowserThread;
 104   friend class base::DeleteHelper<VideoCaptureHost>;
 105   friend class MockVideoCaptureHost;
 106   friend class VideoCaptureHostTest;
 107
 108   void DoError(VideoCaptureControllerID id);
 109   void DoEnded(VideoCaptureControllerID id);
 110
 111   ~VideoCaptureHost() override;
 112
 113   // IPC message: Start capture on the VideoCaptureDevice referenced by
 114   // |device_id|. |session_id| is an id created by VideoCaptureMessageFilter
 115   // to identify a session between a VideoCaptureMessageFilter and a
 116   // VideoCaptureHost.
 117   void OnStartCapture(int device_id,
 118                       media::VideoCaptureSessionId session_id,
 119                       const media::VideoCaptureParams& params);
 120   void OnControllerAdded(
 121       int device_id,
 122       const base::WeakPtr<VideoCaptureController>& controller);
 123
 124   // IPC message: Stop capture on device referenced by |device_id|.
 125   void OnStopCapture(int device_id);
 126
 127   // IPC message: Pause capture on device referenced by |device_id|.
 128   void OnPauseCapture(int device_id);
 129
 130   void OnResumeCapture(int device_id,
 131                        media::VideoCaptureSessionId session_id,
 132                        const media::VideoCaptureParams& params);
 133
 134   // IPC message: Receive an empty buffer from renderer. Send it to device
 135   // referenced by |device_id|.
 136   void OnReceiveEmptyBuffer(int device_id, int buffer_id, uint32 sync_point);
 137
 138   // IPC message: Get supported formats referenced by |capture_session_id|.
 139   // |device_id| is needed for message back-routing purposes.
 140   void OnGetDeviceSupportedFormats(
 141       int device_id,
 142       media::VideoCaptureSessionId capture_session_id);
 143
 144   // IPC message: Get a device's currently in use format(s), referenced by
 145   // |capture_session_id|. |device_id| is needed for message back-routing
 146   // purposes.
 147   void OnGetDeviceFormatsInUse(int device_id,
 148                                media::VideoCaptureSessionId capture_session_id);
 149
 150   // Deletes the controller and notifies the VideoCaptureManager. |on_error| is
 151   // true if this is triggered by VideoCaptureControllerEventHandler::OnError.
 152   void DeleteVideoCaptureController(VideoCaptureControllerID controller_id,
 153                                     bool on_error);
 154
 155   MediaStreamManager* const media_stream_manager_;
 156
 157   typedef std::map<VideoCaptureControllerID,
 158                    base::WeakPtr<VideoCaptureController>> EntryMap;
 159
 160   // A map of VideoCaptureControllerID to the VideoCaptureController to which it
 161   // is connected. An entry in this map holds a null controller while it is in
 162   // the process of starting.
 163   EntryMap entries_;
 164
 165   DISALLOW_COPY_AND_ASSIGN(VideoCaptureHost);
 166 };
 167
 168 }  // namespace content
 169
 170 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_HOST_H_