Release the camera when WebRTC is not visible in Android

content/browser/renderer_host/media/video_capture_host.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/renderer_host/media/video_capture_host.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
@@ skipping 184 matching lines @@
   DeleteVideoCaptureControllerOnIOThread(controller_id, false);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // IPC Messages handler.
 bool VideoCaptureHost::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(VideoCaptureHost, message)
     IPC_MESSAGE_HANDLER(VideoCaptureHostMsg_Start, OnStartCapture)
     IPC_MESSAGE_HANDLER(VideoCaptureHostMsg_Pause, OnPauseCapture)
+    IPC_MESSAGE_HANDLER(VideoCaptureHostMsg_Resume, OnResumeCapture)
     IPC_MESSAGE_HANDLER(VideoCaptureHostMsg_Stop, OnStopCapture)
     IPC_MESSAGE_HANDLER(VideoCaptureHostMsg_BufferReady, OnReceiveEmptyBuffer)
     IPC_MESSAGE_HANDLER(VideoCaptureHostMsg_GetDeviceSupportedFormats,
                         OnGetDeviceSupportedFormats)
     IPC_MESSAGE_HANDLER(VideoCaptureHostMsg_GetDeviceFormatsInUse,
                         OnGetDeviceFormatsInUse)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled;
@@ skipping 73 matching lines @@
   VideoCaptureControllerID controller_id(device_id);
 
   Send(new VideoCaptureMsg_StateChanged(device_id,
                                         VIDEO_CAPTURE_STATE_STOPPED));
   DeleteVideoCaptureControllerOnIOThread(controller_id, false);
 }
 
 void VideoCaptureHost::OnPauseCapture(int device_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DVLOG(1) << "VideoCaptureHost::OnPauseCapture, device_id " << device_id;
-  // Not used.
-  Send(new VideoCaptureMsg_StateChanged(device_id, VIDEO_CAPTURE_STATE_ERROR));
+
+  VideoCaptureControllerID controller_id(device_id);
+  EntryMap::iterator it = entries_.find(controller_id);
+  if (it == entries_.end())
+    return;
+
+  if (it->second) {
+    media_stream_manager_->video_capture_manager()->PauseCaptureForClient(
+        it->second.get(), controller_id, this);
+  }
+}
+
+void VideoCaptureHost::OnResumeCapture(
+    int device_id,
+    media::VideoCaptureSessionId session_id,
+    const media::VideoCaptureParams& params) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DVLOG(1) << "VideoCaptureHost::OnResumeCapture, device_id " << device_id;
+
+  VideoCaptureControllerID controller_id(device_id);
+  EntryMap::iterator it = entries_.find(controller_id);
+  if (it == entries_.end())
+    return;
+
+  if (it->second) {
+    media_stream_manager_->video_capture_manager()->ResumeCaptureForClient(
+        session_id, params, it->second.get(), controller_id, this);
+  }
 }
 
 void VideoCaptureHost::OnReceiveEmptyBuffer(int device_id,
                                             int buffer_id,
                                             uint32 sync_point) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   VideoCaptureControllerID controller_id(device_id);
   EntryMap::iterator it = entries_.find(controller_id);
   if (it != entries_.end()) {
@@ skipping 46 matching lines @@
     return;
 
   if (it->second) {
     media_stream_manager_->video_capture_manager()->StopCaptureForClient(
         it->second.get(), controller_id, this, on_error);
   }
   entries_.erase(it);
 }
 
 }  // namespace content