Refactor MediaStreamManager to never output real device id. It now always output sourceId in the fo…

content/browser/renderer_host/media/media_stream_manager.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/media_stream_manager.h"
 
 #include <list>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/rand_util.h"
+#include "base/run_loop.h"
 #include "base/threading/thread.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
 #include "content/browser/renderer_host/media/device_request_message_filter.h"
 #include "content/browser/renderer_host/media/media_stream_requester.h"
 #include "content/browser/renderer_host/media/media_stream_ui_proxy.h"
 #include "content/browser/renderer_host/media/video_capture_manager.h"
 #include "content/browser/renderer_host/media/web_contents_capture_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/media_device_id.h"
@@ skipping 149 matching lines @@
     InitializeDeviceManagersOnIOThread();
   } else {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&MediaStreamManager::InitializeDeviceManagersOnIOThread,
                    base::Unretained(this)));
   }
 }
 
 MediaStreamManager::~MediaStreamManager() {
+  DVLOG(1) << "~MediaStreamManager";
   DCHECK(requests_.empty());
   DCHECK(!device_thread_.get());
 }
 
 VideoCaptureManager* MediaStreamManager::video_capture_manager() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(video_capture_manager_.get());
   return video_capture_manager_.get();
 }
 
 AudioInputDeviceManager* MediaStreamManager::audio_input_device_manager() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(audio_input_device_manager_.get());
   return audio_input_device_manager_.get();
 }
 
 std::string MediaStreamManager::MakeMediaAccessRequest(
     int render_process_id,
     int render_view_id,
     int page_request_id,
     const StreamOptions& options,
     const GURL& security_origin,
     const MediaRequestResponseCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   // Create a new request based on options.
   MediaStreamRequest stream_request(
-      render_process_id, render_view_id, page_request_id, std::string(),
+      render_process_id, render_view_id, page_request_id,
       security_origin, MEDIA_DEVICE_ACCESS, std::string(), std::string(),
       options.audio_type, options.video_type);
   DeviceRequest* request = new DeviceRequest(NULL, stream_request,
                                              render_process_id, render_view_id);
   const std::string& label = AddRequest(request);
 
   request->callback = callback;
-
-  HandleRequest(label);
-
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&MediaStreamManager::HandleRequest,
+                 base::Unretained(this), label));
   return label;
 }
 
 std::string MediaStreamManager::GenerateStream(
     MediaStreamRequester* requester,
     int render_process_id,
     int render_view_id,
     int page_request_id,
     const StreamOptions& options,
     const GURL& security_origin) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kUseFakeDeviceForMediaStream)) {
     UseFakeDevice();
   }
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kUseFakeUIForMediaStream)) {
     UseFakeUI(scoped_ptr<FakeMediaStreamUIProxy>());
   }
 
-  int target_render_process_id = render_process_id;
-  int target_render_view_id = render_view_id;
-  std::string tab_capture_device_id;
-
-  // Customize options for a WebContents based capture.
-  if (options.audio_type == MEDIA_TAB_AUDIO_CAPTURE ||
-      options.video_type == MEDIA_TAB_VIDEO_CAPTURE) {
-    // TODO(justinlin): Can't plumb audio mirroring using stream type right
-    // now, so plumbing by device_id. Will revisit once it's refactored.
-    // http://crbug.com/163100
-    tab_capture_device_id =
-        WebContentsCaptureUtil::AppendWebContentsDeviceScheme(
-            !options.video_device_id.empty() ?
-            options.video_device_id : options.audio_device_id);
-
-    bool has_valid_device_id = WebContentsCaptureUtil::ExtractTabCaptureTarget(
-        tab_capture_device_id, &target_render_process_id,
-        &target_render_view_id);
-    if (!has_valid_device_id ||
-        (options.audio_type != MEDIA_TAB_AUDIO_CAPTURE &&
-         options.audio_type != MEDIA_NO_SERVICE) ||
-        (options.video_type != MEDIA_TAB_VIDEO_CAPTURE &&
-         options.video_type != MEDIA_NO_SERVICE)) {
-      LOG(ERROR) << "Invalid request.";
-      return std::string();
-    }
-  }
-
-  std::string translated_audio_device_id;
-  std::string translated_video_device_id;
-  if (options.audio_type == MEDIA_DEVICE_AUDIO_CAPTURE) {
-    bool found_match = TranslateGUIDToRawId(
-        MEDIA_DEVICE_AUDIO_CAPTURE, security_origin, options.audio_device_id,
-        &translated_audio_device_id);
-    DCHECK(found_match || translated_audio_device_id.empty());
-  }
-
-  if (options.video_type == MEDIA_DEVICE_VIDEO_CAPTURE) {
-    bool found_match = TranslateGUIDToRawId(
-        MEDIA_DEVICE_VIDEO_CAPTURE, security_origin, options.video_device_id,
-        &translated_video_device_id);
-    DCHECK(found_match || translated_video_device_id.empty());
-  }
-
-  if (options.video_type == MEDIA_DESKTOP_VIDEO_CAPTURE ||
-      options.audio_type == MEDIA_LOOPBACK_AUDIO_CAPTURE) {
-    // For screen capture we only support two valid combinations:
-    // (1) screen video capture only, or
-    // (2) screen video capture with loopback audio capture.
-    if (options.video_type != MEDIA_DESKTOP_VIDEO_CAPTURE ||
-        (options.audio_type != MEDIA_NO_SERVICE &&
-         options.audio_type != MEDIA_LOOPBACK_AUDIO_CAPTURE)) {
-      // TODO(sergeyu): Surface error message to the calling JS code.
-      LOG(ERROR) << "Invalid screen capture request.";
-      return std::string();
-    }
-    translated_video_device_id = options.video_device_id;
-  }
-
   // Create a new request based on options.
   MediaStreamRequest stream_request(
-      target_render_process_id, target_render_view_id, page_request_id,
-      tab_capture_device_id, security_origin, MEDIA_GENERATE_STREAM,
-      translated_audio_device_id, translated_video_device_id,
+      render_process_id, render_view_id, page_request_id,
+      security_origin, MEDIA_GENERATE_STREAM,
+      options.audio_device_id, options.video_device_id,
       options.audio_type, options.video_type);
   DeviceRequest* request = new DeviceRequest(requester, stream_request,
                                              render_process_id,
                                              render_view_id);
   const std::string& label = AddRequest(request);
-  HandleRequest(label);
+
+  // Need to post a task since the requester won't have label till
+  // this function returns.
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&MediaStreamManager::HandleRequest,
+                 base::Unretained(this), label));
   return label;
 }
 
 void MediaStreamManager::CancelRequest(const std::string& label) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
-  DeviceRequests::iterator request_it = requests_.find(label);
-  if (request_it == requests_.end()) {
-    NOTREACHED();
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&MediaStreamManager::DoCancelRequest,
+                 base::Unretained(this), label));
+}
+
+void MediaStreamManager::DoCancelRequest(const std::string& label) {
+  DVLOG(1) << "DoCancelRequest({label = " << label <<  "})";
+
+  DeviceRequest* request = FindRequest(label);
+  if (!request) {
+    // This can happen if the request completes before DoCancelRequest is
+    // executed or if a client call cancel request on a stream that has failed.
     return;
   }
-  scoped_ptr<DeviceRequest> request(request_it->second);
-  RemoveRequest(request_it);
-
   if (request->request.request_type == MEDIA_ENUMERATE_DEVICES) {
+    DeleteRequest(label);
     return;
   }
 
   // This is a request for opening one or more devices.
   for (StreamDeviceInfoArray::iterator device_it = request->devices.begin();
       device_it != request->devices.end(); ++device_it) {
     // If we have not yet requested the device to be opened - just ignore it.
     if (request->state(device_it->device.type) != MEDIA_REQUEST_STATE_OPENING
         &&
         request->state(device_it->device.type) != MEDIA_REQUEST_STATE_DONE) {
       continue;
     }
     // Stop the opening/opened devices of the requests.
     StopDevice(*device_it);
   }
 
   // Cancel the request if still pending at UI side.
   request->SetState(NUM_MEDIA_TYPES, MEDIA_REQUEST_STATE_CLOSING);
+  DeleteRequest(label);
 }
 
 void MediaStreamManager::CancelAllRequests(int render_process_id) {
   DeviceRequests::iterator request_it = requests_.begin();
   while (request_it != requests_.end()) {
     if (request_it->second->requesting_process_id != render_process_id) {
       ++request_it;
       continue;
     }
 
     std::string label = request_it->first;
     ++request_it;
-    CancelRequest(label);
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&MediaStreamManager::DoCancelRequest,
+                   base::Unretained(this), label));
   }
 }
 
 void MediaStreamManager::StopStreamDevice(int render_process_id,
                                           int render_view_id,
                                           const std::string& device_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DVLOG(1) << "StopStreamDevice({render_view_id = " << render_view_id <<  "} "
            << ", {device_id = " << device_id << "})";
+  BrowserThread::PostTask(
+         BrowserThread::IO, FROM_HERE,
+         base::Bind(&MediaStreamManager::DoStopStreamDevice,
+                    base::Unretained(this), render_process_id, render_view_id,
+                    device_id));
+}
 
+void MediaStreamManager::DoStopStreamDevice(int render_process_id,
+                                            int render_view_id,
+                                            const std::string& device_id) {
   // Find all requests for this |render_process_id| and |render_view_id| of type
   // MEDIA_GENERATE_STREAM that has requested to use |device_id|.
   DeviceRequests::iterator request_it = requests_.begin();
   while (request_it  != requests_.end()) {
     DeviceRequest* request = request_it->second;
     const MediaStreamRequest& ms_request = request->request;
     if (request->requesting_process_id != render_process_id ||
         request->requesting_view_id != render_view_id ||
         ms_request.request_type != MEDIA_GENERATE_STREAM) {
       ++request_it;
       continue;
     }
 
     StreamDeviceInfoArray* devices = &request->devices;
     StreamDeviceInfoArray::iterator device_it = devices->begin();
     while (device_it != devices->end()) {
       MediaStreamType device_type = device_it->device.type;
       if (device_it->device.id == device_id) {
         if (request->state(device_type) == MEDIA_REQUEST_STATE_DONE) {
           StopDevice(*device_it);
         }
         device_it = devices->erase(device_it);
       } else {
         ++device_it;
       }
     }
 
     // If this request doesn't have any active devices, remove the request.
     if (devices->empty()) {
-      DeviceRequests::iterator del_itor(request_it);
+      std::string label = request_it->first;
       ++request_it;
-      scoped_ptr<DeviceRequest> request(del_itor->second);
-      RemoveRequest(del_itor);
+      DeleteRequest(label);
     } else {
       ++request_it;
     }
   }
 }
 
 void MediaStreamManager::StopDevice(const StreamDeviceInfo& device_info) {
   DVLOG(1) << "StopDevice("
            << "{device_info.session_id = " << device_info.session_id <<  "} "
            << "{device_id = " << device_info.device.id << "})";
@@ skipping 30 matching lines @@
   // starts monitoring devices.
   if (!requester) {
     if (!monitoring_started_)
       StartMonitoring();
 
     return std::string();
   }
 
   // Create a new request.
   StreamOptions options;
-  EnumerationCache* cache = NULL;
   if (type == MEDIA_DEVICE_AUDIO_CAPTURE) {
     options.audio_type = type;
-    cache = &audio_enumeration_cache_;
   } else if (type == MEDIA_DEVICE_VIDEO_CAPTURE) {
     options.video_type = type;
-    cache = &video_enumeration_cache_;
   } else {
     NOTREACHED();
     return std::string();
   }
 
   MediaStreamRequest stream_request(
-      render_process_id, render_view_id, page_request_id, std::string(),
+      render_process_id, render_view_id, page_request_id,
       security_origin, MEDIA_ENUMERATE_DEVICES, std::string(), std::string(),
       options.audio_type, options.video_type);
   DeviceRequest* request = new DeviceRequest(requester, stream_request,
                                              render_process_id,
                                              render_view_id);
   const std::string& label = AddRequest(request);
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&MediaStreamManager::DoEnumerateDevices,
+                 base::Unretained(this), label));
+
+  return label;
+}
+
+void MediaStreamManager::DoEnumerateDevices(const std::string& label) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DeviceRequest* request = FindRequest(label);;
+
+  MediaStreamType type;
+  EnumerationCache* cache;
+  if (request->request.audio_type == MEDIA_DEVICE_AUDIO_CAPTURE) {
+    DCHECK(request->request.video_type == MEDIA_NO_SERVICE);
+    type = MEDIA_DEVICE_AUDIO_CAPTURE;
+    cache = &audio_enumeration_cache_;
+  } else {
+    DCHECK(request->request.video_type == MEDIA_DEVICE_VIDEO_CAPTURE);
+    type = MEDIA_DEVICE_VIDEO_CAPTURE;
+    cache = &video_enumeration_cache_;
+  }
 
   if (cache->valid) {
     // Cached device list of this type exists. Just send it out.
     request->SetState(type, MEDIA_REQUEST_STATE_REQUESTED);
-
-    // Need to post a task since the requester won't have label till
-    // this function returns.
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
-        base::Bind(&MediaStreamManager::SendCachedDeviceList,
-                   base::Unretained(this), cache, label));
+    request->devices = cache->devices;
+    FinalizeEnumerateDevices(label, request);
   } else {
     StartEnumeration(request);
   }
-
-  return label;
 }
 
 std::string MediaStreamManager::OpenDevice(
     MediaStreamRequester* requester,
     int render_process_id,
     int render_view_id,
     int page_request_id,
     const std::string& device_id,
     MediaStreamType type,
     const GURL& security_origin) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(type == MEDIA_DEVICE_AUDIO_CAPTURE ||
          type == MEDIA_DEVICE_VIDEO_CAPTURE);
 
   // Create a new request.
   StreamOptions options;
   if (IsAudioMediaType(type)) {
     options.audio_type = type;
     options.audio_device_id = device_id;
   } else if (IsVideoMediaType(type)) {
     options.video_type = type;
     options.video_device_id = device_id;
   } else {
     NOTREACHED();
     return std::string();
   }
 
   MediaStreamRequest stream_request(
-      render_process_id, render_view_id, page_request_id, std::string(),
+      render_process_id, render_view_id, page_request_id,
       security_origin, MEDIA_OPEN_DEVICE, options.audio_device_id,
       options.video_device_id, options.audio_type, options.video_type);
   DeviceRequest* request = new DeviceRequest(requester, stream_request,
                                              render_process_id,
                                              render_view_id);
   const std::string& label = AddRequest(request);
-  StartEnumeration(request);
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&MediaStreamManager::HandleRequest,
+                 base::Unretained(this), label));
 
   return label;
 }
 
-void MediaStreamManager::SendCachedDeviceList(
-    EnumerationCache* cache,
-    const std::string& label) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  if (cache->valid) {
-    DeviceRequests::iterator it = requests_.find(label);
-    if (it != requests_.end()) {
-      it->second->requester->DevicesEnumerated(label, cache->devices);
-    }
-  }
-}
-
 void MediaStreamManager::StartMonitoring() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (!base::SystemMonitor::Get())
     return;
 
   if (!monitoring_started_) {
     monitoring_started_ = true;
     base::SystemMonitor::Get()->AddDevicesChangedObserver(this);
 
     // Enumerate both the audio and video devices to cache the device lists
     // and send them to media observer.
     ++active_enumeration_ref_count_[MEDIA_DEVICE_AUDIO_CAPTURE];
     audio_input_device_manager_->EnumerateDevices(MEDIA_DEVICE_AUDIO_CAPTURE);
     ++active_enumeration_ref_count_[MEDIA_DEVICE_VIDEO_CAPTURE];
     video_capture_manager_->EnumerateDevices(MEDIA_DEVICE_VIDEO_CAPTURE);
   }
 }
 
 void MediaStreamManager::StopMonitoring() {
   DCHECK_EQ(base::MessageLoop::current(), io_loop_);
   if (monitoring_started_) {
     base::SystemMonitor::Get()->RemoveDevicesChangedObserver(this);
     monitoring_started_ = false;
     ClearEnumerationCache(&audio_enumeration_cache_);
     ClearEnumerationCache(&video_enumeration_cache_);
   }
 }
 
-bool MediaStreamManager::TranslateGUIDToRawId(MediaStreamType stream_type,
-                                              const GURL& security_origin,
-                                              const std::string& device_guid,
-                                              std::string* raw_device_id) {
+bool MediaStreamManager::TranslateRequestedSourceIdToDeviceId(
+    MediaStreamRequest* request) {
+  // If a specific device has been requested we need to find the real device id.
+  if (request->audio_type == MEDIA_DEVICE_AUDIO_CAPTURE &&
+      !request->requested_audio_device_id.empty()) {
+    if (!TranslateSourceIdToDeviceId(MEDIA_DEVICE_AUDIO_CAPTURE,
+                                     request->security_origin,
+                                     request->requested_audio_device_id,
+                                     &request->requested_audio_device_id)) {
+      // TODO(perkj): gUM should support mandatory and optional constraints.
+      // Ie - if the sourceId is optional but it does not match - gUM should
+      // not fail. For now we treat sourceId as a mandatory constraint.
+      LOG(ERROR) << "Requested device does not exist.";
+      return false;
+    }
+  }
+
+  if (request->video_type == MEDIA_DEVICE_VIDEO_CAPTURE &&
+      !request->requested_video_device_id.empty()) {
+    if (!TranslateSourceIdToDeviceId(MEDIA_DEVICE_VIDEO_CAPTURE,
+                                     request->security_origin,
+                                     request->requested_video_device_id,
+                                     &request->requested_video_device_id)) {
+      // TODO(perkj): guM should support mandatory and optional constraints.
+      // Ie - if the sourceId is optional but it does not match - guM should
+      // not fail. For now we treat sourceId as a mandatory constraint.
+      return false;
+    }
+  }
+  DVLOG(3) << "Requested audio device " << request->requested_audio_device_id
+           << "Requested video device " << request->requested_video_device_id;
+  return true;
+}
+
+void MediaStreamManager::TranslateDeviceIdToSourceId(
+    const MediaStreamRequest& request,
+    MediaStreamDevice* device) {
+  if (request.audio_type == MEDIA_DEVICE_AUDIO_CAPTURE ||
+      request.video_type == MEDIA_DEVICE_VIDEO_CAPTURE) {
+    device->id = content::GetHMACForMediaDeviceID(
+        request.security_origin,
+        device->id);
+    return;
+  }
+  return;
+}
+
+bool MediaStreamManager::TranslateSourceIdToDeviceId(
+    MediaStreamType stream_type,
+    const GURL& security_origin,
+    const std::string& source_id,
+    std::string* device_id) {
   DCHECK(stream_type == MEDIA_DEVICE_AUDIO_CAPTURE ||
          stream_type == MEDIA_DEVICE_VIDEO_CAPTURE);
-  if (device_guid.empty())
-    return false;
+  DCHECK(!source_id.empty());
 
   EnumerationCache* cache =
       stream_type == MEDIA_DEVICE_AUDIO_CAPTURE ?
       &audio_enumeration_cache_ : &video_enumeration_cache_;
 
   // If device monitoring hasn't started, the |device_guid| is not valid.
   if (!cache->valid)
     return false;
 
   for (StreamDeviceInfoArray::const_iterator it = cache->devices.begin();
        it != cache->devices.end();
        ++it) {
-    if (content::DoesMediaDeviceIDMatchHMAC(
-            security_origin, device_guid, it->device.id)) {
-      *raw_device_id = it->device.id;
+    if (content::DoesMediaDeviceIDMatchHMAC(security_origin, source_id,
+                                            it->device.id)) {
+      *device_id = it->device.id;
       return true;
     }
   }
   return false;
 }
 
 void MediaStreamManager::ClearEnumerationCache(EnumerationCache* cache) {
   DCHECK_EQ(base::MessageLoop::current(), io_loop_);
   cache->valid = false;
 }
@@ skipping 27 matching lines @@
   std::string unique_label;
   do {
     unique_label = RandomLabel();
   } while (requests_.find(unique_label) != requests_.end());
 
   requests_.insert(std::make_pair(unique_label, request));
 
   return unique_label;
 }
 
-void MediaStreamManager::RemoveRequest(DeviceRequests::iterator it) {
+MediaStreamManager::DeviceRequest*
+MediaStreamManager::FindRequest(const std::string& label) {
+  DeviceRequests::iterator request_it = requests_.find(label);
+  return request_it == requests_.end() ? NULL : request_it->second;
+}
+
+void MediaStreamManager::DeleteRequest(const std::string& label) {
+  DeviceRequests::iterator it = requests_.find(label);
+  scoped_ptr<DeviceRequest> request(it->second);
   requests_.erase(it);
 }
 
 void MediaStreamManager::PostRequestToUI(const std::string& label) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DeviceRequest* request = requests_[label];
+  DeviceRequest* request = FindRequest(label);
 
   if (use_fake_ui_) {
     if (!fake_ui_)
       fake_ui_.reset(new FakeMediaStreamUIProxy());
 
     MediaStreamDevices devices;
     if (audio_enumeration_cache_.valid) {
       for (StreamDeviceInfoArray::const_iterator it =
                audio_enumeration_cache_.devices.begin();
            it != audio_enumeration_cache_.devices.end(); ++it) {
@@ skipping 16 matching lines @@
   }
 
   request->ui_proxy->RequestAccess(
       request->request,
       base::Bind(&MediaStreamManager::HandleAccessRequestResponse,
                  base::Unretained(this), label));
 }
 
 void MediaStreamManager::HandleRequest(const std::string& label) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DeviceRequest* request = requests_[label];
+  DeviceRequest* request = FindRequest(label);
 
   const MediaStreamType audio_type = request->request.audio_type;
   const MediaStreamType video_type = request->request.video_type;
 
   bool is_web_contents_capture =
       audio_type == MEDIA_TAB_AUDIO_CAPTURE ||
       video_type == MEDIA_TAB_VIDEO_CAPTURE;
+  if (is_web_contents_capture && !SetupTabCaptureRequest(request)) {
+    FinalizeRequestFailed(label, request);
+    return;
+  }
 
   bool is_screen_capture =
       video_type == MEDIA_DESKTOP_VIDEO_CAPTURE;
+  if (is_screen_capture && !SetupScreenCaptureRequest(request)) {
+    FinalizeRequestFailed(label, request);
+    return;
+  }
 
   if (!is_web_contents_capture &&
       !is_screen_capture &&
       ((IsAudioMediaType(audio_type) && !audio_enumeration_cache_.valid) ||
        (IsVideoMediaType(video_type) && !video_enumeration_cache_.valid))) {
     // Enumerate the devices if there is no valid device lists to be used.
     StartEnumeration(request);
     return;
   }
 
+  // If a specific device has been requested we need to find the real device id.
+  if (!TranslateRequestedSourceIdToDeviceId(&request->request)) {
+    FinalizeRequestFailed(label, request);
+    return;
+  }
+
   // No need to do new device enumerations, post the request to UI
   // immediately.
   if (IsAudioMediaType(audio_type))
     request->SetState(audio_type, MEDIA_REQUEST_STATE_PENDING_APPROVAL);
   if (IsVideoMediaType(video_type))
     request->SetState(video_type, MEDIA_REQUEST_STATE_PENDING_APPROVAL);
 
   PostRequestToUI(label);
 }
 
+bool MediaStreamManager::SetupTabCaptureRequest(DeviceRequest* request) {
+  DCHECK(request->request.audio_type == MEDIA_TAB_AUDIO_CAPTURE ||
+         request->request.video_type == MEDIA_TAB_VIDEO_CAPTURE);
+
+  MediaStreamRequest* ms_request = &request->request;
+  // Customize options for a WebContents based capture.
+  int target_render_process_id = 0;
+  int target_render_view_id = 0;
+
+  // TODO(justinlin): Can't plumb audio mirroring using stream type right
+  // now, so plumbing by device_id. Will revisit once it's refactored.
+  // http://crbug.com/163100
+  std::string tab_capture_device_id =
+        WebContentsCaptureUtil::AppendWebContentsDeviceScheme(
+            !ms_request->requested_video_device_id.empty() ?
+             ms_request->requested_video_device_id :
+             ms_request->requested_audio_device_id);
+
+  bool has_valid_device_id = WebContentsCaptureUtil::ExtractTabCaptureTarget(
+      tab_capture_device_id, &target_render_process_id,
+      &target_render_view_id);
+  if (!has_valid_device_id ||
+      (ms_request->audio_type != MEDIA_TAB_AUDIO_CAPTURE &&
+       ms_request->audio_type != MEDIA_NO_SERVICE) ||
+      (ms_request->video_type != MEDIA_TAB_VIDEO_CAPTURE &&
+       ms_request->video_type != MEDIA_NO_SERVICE)) {
+    return false;
+  }
+  ms_request->tab_capture_device_id = tab_capture_device_id;
+  ms_request->render_process_id = target_render_process_id;
+  ms_request->render_view_id = target_render_view_id;
+  DVLOG(3) << "SetupTabCaptureRequest "
+           << ", {tab_capture_device_id = " << tab_capture_device_id <<  "}"
+           << ", {target_render_process_id = " << target_render_process_id
+           << "}"
+           << ", {target_render_view_id = " << target_render_view_id << "}";
+  return true;
+}
+
+bool MediaStreamManager::SetupScreenCaptureRequest(DeviceRequest* request) {
+  DCHECK(request->request.audio_type ==  MEDIA_LOOPBACK_AUDIO_CAPTURE ||
+         request->request.video_type == MEDIA_DESKTOP_VIDEO_CAPTURE);
+  const MediaStreamRequest& ms_request = request->request;
+
+  // For screen capture we only support two valid combinations:
+  // (1) screen video capture only, or
+  // (2) screen video capture with loopback audio capture.
+  if (ms_request.video_type != MEDIA_DESKTOP_VIDEO_CAPTURE ||
+      (ms_request.audio_type != MEDIA_NO_SERVICE &&
+       ms_request.audio_type != MEDIA_LOOPBACK_AUDIO_CAPTURE)) {
+    // TODO(sergeyu): Surface error message to the calling JS code.
+    LOG(ERROR) << "Invalid screen capture request.";
+    return false;
+  }
+  return true;
+}
+
+const StreamDeviceInfo* MediaStreamManager::FindRequestedDeviceInfoForTest(
+    const std::string& source_id,
+    int render_process_id,
+    int render_view_id,
+    MediaStreamRequestType type) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  for (DeviceRequests::const_iterator it = requests_.begin();
+       it != requests_.end() ; ++it) {
+    const DeviceRequest* request = it->second;
+    if (request->request.render_process_id == render_process_id &&
+        request->request.render_view_id == render_view_id &&
+        request->request.request_type == type) {
+      for (StreamDeviceInfoArray::const_iterator device_it =
+               request->devices.begin();
+           device_it != request->devices.end(); ++device_it) {
+        if (source_id == device_it->device.id) {
+          return &*device_it;
+        }
+      }
+    }
+  }
+  return NULL;
+}
+
 bool MediaStreamManager::FindExistingRequestedDeviceInfo(
     int render_process_id,
     int render_view_id,
+    const GURL& security_origin,
     MediaStreamRequestType type,
     const std::string& device_id,
+    MediaStreamType device_type,
     StreamDeviceInfo* device_info,
     MediaRequestState* request_state) const {
   DCHECK(device_info);
   DCHECK(request_state);
+
+  std::string source_id = content::GetHMACForMediaDeviceID(
+      security_origin,
+      device_id);
+
   for (DeviceRequests::const_iterator it = requests_.begin();
        it != requests_.end() ; ++it) {
     const DeviceRequest* request = it->second;
-    if (request->requesting_process_id ==render_process_id &&
+    if (request->requesting_process_id == render_process_id &&
         request->requesting_view_id == render_view_id &&
         request->request.request_type == type) {
       for (StreamDeviceInfoArray::const_iterator device_it =
                request->devices.begin();
            device_it != request->devices.end(); ++device_it) {
-        if (device_it->device.id == device_id) {
+        if (device_it->device.id == source_id &&
+            device_it->device.type == device_type) {
             *device_info = *device_it;
             *request_state = request->state(device_it->device.type);
           return true;
         }
       }
     }
   }
   return false;
 }
 
+void MediaStreamManager::FinalizeGenerateStream(const std::string& label,
+                                                DeviceRequest* request) {
+  const StreamDeviceInfoArray& requested_devices = request->devices;
+
+  // Partition the array of devices into audio vs video.
+  StreamDeviceInfoArray audio_devices, video_devices;
+  for (StreamDeviceInfoArray::const_iterator device_it =
+           requested_devices.begin();
+       device_it != requested_devices.end(); ++device_it) {
+    if (IsAudioMediaType(device_it->device.type)) {
+      audio_devices.push_back(*device_it);
+    } else if (IsVideoMediaType(device_it->device.type)) {
+      video_devices.push_back(*device_it);
+    } else {
+      NOTREACHED();
+    }
+  }
+
+  request->requester->StreamGenerated(label, audio_devices, video_devices);
+}
+
+void MediaStreamManager::FinalizeRequestFailed(
+    const std::string& label,
+    DeviceRequest* request) {
+  if (request->requester)
+    request->requester->StreamGenerationFailed(label);
+
+  if (request->request.request_type == MEDIA_DEVICE_ACCESS &&
+      !request->callback.is_null()) {
+    request->callback.Run(MediaStreamDevices(), request->ui_proxy.Pass());
+  }
+
+  DeleteRequest(label);
+}
+
+void MediaStreamManager::FinalizeOpenDevice(const std::string& label,
+                                            DeviceRequest* request) {
+  const StreamDeviceInfoArray& requested_devices = request->devices;
+  request->requester->DeviceOpened(label, requested_devices.front());
+}
+
+void MediaStreamManager::FinalizeEnumerateDevices(const std::string& label,
+                                                  DeviceRequest* request) {
+  for (StreamDeviceInfoArray::iterator it = request->devices.begin();
+       it != request->devices.end(); ++it) {
+    TranslateDeviceIdToSourceId(request->request, &it->device);
+  }
+  request->requester->DevicesEnumerated(label, request->devices);
+}
+
+void MediaStreamManager::FinalizeMediaAccessRequest(
+    const std::string& label,
+    DeviceRequest* request,
+    const MediaStreamDevices& devices) {
+  if (!request->callback.is_null())
+    request->callback.Run(devices, request->ui_proxy.Pass());
+
+  // Delete the request since it is done.
+  DeleteRequest(label);
+}
+
 void MediaStreamManager::InitializeDeviceManagersOnIOThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (device_thread_)
     return;
 
   device_thread_.reset(new base::Thread("MediaStreamDeviceThread"));
 #if defined(OS_WIN)
   device_thread_->init_com_with_mta(true);
 #endif
   CHECK(device_thread_->Start());
@@ skipping 34 matching lines @@
         request->SetState(device_it->device.type, MEDIA_REQUEST_STATE_DONE);
 
         if (IsAudioMediaType(device_it->device.type)) {
           // Store the native audio parameters in the device struct.
           // TODO(xians): Handle the tab capture sample rate/channel layout
           // in AudioInputDeviceManager::Open().
           if (device_it->device.type != content::MEDIA_TAB_AUDIO_CAPTURE) {
             const StreamDeviceInfo* info =
                 audio_input_device_manager_->GetOpenedDeviceInfoById(
                     device_it->session_id);
-            DCHECK_EQ(info->device.id, device_it->device.id);
             device_it->device.input = info->device.input;
             device_it->device.matched_output = info->device.matched_output;
           }
         }
         if (RequestDone(*request))
           HandleRequestDone(label, request);
         break;
       }
     }
   }
 }
 
 void MediaStreamManager::HandleRequestDone(const std::string& label,
                                            DeviceRequest* request) {
   DCHECK(RequestDone(*request));
   DVLOG(1) << "HandleRequestDone("
            << ", {label = " << label <<  "})";
 
-  const StreamDeviceInfoArray& requested_devices = request->devices;
   switch (request->request.request_type) {
     case MEDIA_OPEN_DEVICE:
-      request->requester->DeviceOpened(label, requested_devices.front());
+      FinalizeOpenDevice(label, request);
       break;
     case MEDIA_GENERATE_STREAM: {
-      // Partition the array of devices into audio vs video.
-      StreamDeviceInfoArray audio_devices, video_devices;
-      for (StreamDeviceInfoArray::const_iterator device_it =
-               requested_devices.begin();
-           device_it != requested_devices.end(); ++device_it) {
-        if (IsAudioMediaType(device_it->device.type)) {
-          audio_devices.push_back(*device_it);
-        } else if (IsVideoMediaType(device_it->device.type)) {
-          video_devices.push_back(*device_it);
-        } else {
-          NOTREACHED();
-        }
-      }
-
-      request->requester->StreamGenerated(label, audio_devices, video_devices);
+      FinalizeGenerateStream(label, request);
       break;
     }
     default:
       NOTREACHED();
       break;
   }
 
   if (request->ui_proxy.get()) {
     request->ui_proxy->OnStarted(
         base::Bind(&MediaStreamManager::StopStreamFromUI,
                    base::Unretained(this), label));
   }
 }
 
 void MediaStreamManager::Closed(MediaStreamType stream_type,
                                 int capture_session_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 }
 
 void MediaStreamManager::DevicesEnumerated(
     MediaStreamType stream_type, const StreamDeviceInfoArray& devices) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DVLOG(1) << "DevicesEnumerated";
 
   // Only cache the device list when the device list has been changed.
   bool need_update_clients = false;
   EnumerationCache* cache =
       stream_type == MEDIA_DEVICE_AUDIO_CAPTURE ?
       &audio_enumeration_cache_ : &video_enumeration_cache_;
   if (!cache->valid ||
       devices.size() != cache->devices.size() ||
       !std::equal(devices.begin(), devices.end(), cache->devices.begin(),
                   StreamDeviceInfo::IsEqual)) {
@@ skipping 14 matching lines @@
        ++it) {
     if (it->second->state(stream_type) == MEDIA_REQUEST_STATE_REQUESTED &&
         Requested(it->second->request, stream_type)) {
       if (it->second->request.request_type != MEDIA_ENUMERATE_DEVICES)
         it->second->SetState(stream_type, MEDIA_REQUEST_STATE_PENDING_APPROVAL);
       label_list.push_back(it->first);
     }
   }
   for (std::list<std::string>::iterator it = label_list.begin();
        it != label_list.end(); ++it) {
-    DeviceRequest* request = requests_[*it];
+    DeviceRequest* request = FindRequest(*it);
     switch (request->request.request_type) {
       case MEDIA_ENUMERATE_DEVICES:
-        if (need_update_clients && request->requester)
-          request->requester->DevicesEnumerated(*it, devices);
+        if (need_update_clients && request->requester) {
+          request->devices = devices;
+          FinalizeEnumerateDevices(*it, request);
+        }
         break;
       default:
         if (request->state(request->request.audio_type) ==
                 MEDIA_REQUEST_STATE_REQUESTED ||
             request->state(request->request.video_type) ==
                 MEDIA_REQUEST_STATE_REQUESTED) {
           // We are doing enumeration for other type of media, wait until it is
           // all done before posting the request to UI because UI needs
           // the device lists to handle the request.
           break;
         }
 
-        // Post the request to UI for permission approval.
-        PostRequestToUI(*it);
+        // Continue to handle the request.
+        HandleRequest(*it);
         break;
     }
   }
   label_list.clear();
   --active_enumeration_ref_count_[stream_type];
   DCHECK_GE(active_enumeration_ref_count_[stream_type], 0);
 }
 
-void MediaStreamManager::Error(MediaStreamType stream_type,
-                               int capture_session_id,
-                               MediaStreamProviderError error) {
-  // Find the device for the error call.
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DVLOG(1) << "Error("
-           << "{stream_type = " << stream_type << "} ,"
-           << "{capture_session_id = " << capture_session_id <<  "})";
-
-
-  for (DeviceRequests::iterator it = requests_.begin(); it != requests_.end();
-       ++it) {
-    StreamDeviceInfoArray& devices = it->second->devices;
-
-    // TODO(miu): BUG.  It's possible for the audio (or video) device array in
-    // the "requester" to become out-of-sync with the order of devices we have
-    // here.  See http://crbug.com/147650
-    int audio_device_idx = -1;
-    int video_device_idx = -1;
-    for (StreamDeviceInfoArray::iterator device_it = devices.begin();
-         device_it != devices.end(); ++device_it) {
-      if (IsAudioMediaType(device_it->device.type)) {
-        ++audio_device_idx;
-      } else if (IsVideoMediaType(device_it->device.type)) {
-        ++video_device_idx;
-      } else {
-        NOTREACHED();
-        continue;
-      }
-      if (device_it->device.type != stream_type ||
-          device_it->session_id != capture_session_id) {
-        continue;
-      }
-      // We've found the failing device. Find the error case:
-      // An error should only be reported to the MediaStreamManager if
-      // the request has not been fulfilled yet.
-      DCHECK(it->second->state(stream_type) != MEDIA_REQUEST_STATE_DONE);
-      if (it->second->state(stream_type) != MEDIA_REQUEST_STATE_DONE) {
-        // Request is not done, devices are not opened in this case.
-        if (devices.size() <= 1) {
-          scoped_ptr<DeviceRequest> request(it->second);
-          // 1. Device not opened and no other devices for this request ->
-          //    signal stream error and remove the request.
-          if (request->requester)
-            request->requester->StreamGenerationFailed(it->first);
-
-          RemoveRequest(it);
-        } else {
-          // 2. Not opened but other devices exists for this request -> remove
-          //    device from list, but don't signal an error.
-          devices.erase(device_it);  // NOTE: This invalidates device_it!
-          it->second->SetState(stream_type, MEDIA_REQUEST_STATE_ERROR);
-          DVLOG(1) << "Error("
-                   << ", {capture_session_id = " << capture_session_id <<  "})";
-        }
-      }
-      if (RequestDone(*it->second))
-        HandleRequestDone(it->first, it->second);
-      break;
-    }
-  }
-}
-
 void MediaStreamManager::HandleAccessRequestResponse(
     const std::string& label,
     const MediaStreamDevices& devices) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DVLOG(1) << "HandleAccessRequestResponse("
            << ", {label = " << label <<  "})";
 
-  DeviceRequests::iterator request_it = requests_.find(label);
-  if (request_it == requests_.end()) {
+  DeviceRequest* request = FindRequest(label);
+  if (!request) {
+    // The request has been canceled before the UI returns.
+    return;
+  }
+
+  if (request->request.request_type == MEDIA_DEVICE_ACCESS) {
+    FinalizeMediaAccessRequest(label, request, devices);
     return;
   }
 
   // Handle the case when the request was denied.
   if (devices.empty()) {
-    // Notify the users about the request result.
-    scoped_ptr<DeviceRequest> request(request_it->second);
-    if (request->requester)
-      request->requester->StreamGenerationFailed(label);
-
-    if (request->request.request_type == MEDIA_DEVICE_ACCESS &&
-        !request->callback.is_null()) {
-      request->callback.Run(MediaStreamDevices(), request->ui_proxy.Pass());
-    }
-
-    RemoveRequest(request_it);
-    return;
-  }
-
-  if (request_it->second->request.request_type == MEDIA_DEVICE_ACCESS) {
-    scoped_ptr<DeviceRequest> request(request_it->second);
-    if (!request->callback.is_null())
-      request->callback.Run(devices, request->ui_proxy.Pass());
-
-    // Delete the request since it is done.
-    RemoveRequest(request_it);
+    FinalizeRequestFailed(label, request);
     return;
   }
 
   // Process all newly-accepted devices for this request.
-  DeviceRequest* request = request_it->second;
   bool found_audio = false;
   bool found_video = false;
   for (MediaStreamDevices::const_iterator device_it = devices.begin();
        device_it != devices.end(); ++device_it) {
     StreamDeviceInfo device_info;
     device_info.device = *device_it;
 
     // TODO(justinlin): Nicer way to do this?
     // Re-append the device's id since we lost it when posting request to UI.
     if (device_info.device.type == content::MEDIA_TAB_VIDEO_CAPTURE ||
@@ skipping 20 matching lines @@
     if (device_info.device.type == request->request.audio_type) {
       found_audio = true;
     } else if (device_info.device.type == request->request.video_type) {
       found_video = true;
     }
 
     // If this is request for a new MediaStream, a device is only opened once
     // per render view. This is so that the permission to use a device can be
     // revoked by a single call to StopStreamDevice regardless of how many
     // MediaStreams it is being used in.
-
     if (request->request.request_type == MEDIA_GENERATE_STREAM) {
       MediaRequestState state;
       if (FindExistingRequestedDeviceInfo(request->requesting_process_id,
                                           request->requesting_view_id,
+                                          request->request.security_origin,
                                           request->request.request_type,
-                                          device_it->id,
+                                          device_info.device.id,
+                                          device_info.device.type,
                                           &device_info,
                                           &state)) {
         request->devices.push_back(device_info);
         request->SetState(device_info.device.type, state);
         DVLOG(1) << "HandleAccessRequestResponse - device already opened "
             << ", {label = " << label <<  "}"
             << ", device_id = " << device_it->id << "}";
         continue;
       }
     }
     device_info.session_id =
         GetDeviceManager(device_info.device.type)->Open(device_info);
+    TranslateDeviceIdToSourceId(request->request, &device_info.device);
     request->devices.push_back(device_info);
+
     request->SetState(device_info.device.type, MEDIA_REQUEST_STATE_OPENING);
     DVLOG(1) << "HandleAccessRequestResponse - opening device "
              << ", {label = " << label <<  "}"
-             << ", {device_id = " << device_it->id << "}"
+             << ", {device_id = " << device_info.device.id << "}"
              << ", {session_id = " << device_info.session_id << "}";
   }
 
   // Check whether we've received all stream types requested.
   if (!found_audio && IsAudioMediaType(request->request.audio_type)) {
     request->SetState(request->request.audio_type, MEDIA_REQUEST_STATE_ERROR);
     DVLOG(1) << "Set no audio found label " << label;
   }
 
   if (!found_video && IsVideoMediaType(request->request.video_type))
     request->SetState(request->request.video_type, MEDIA_REQUEST_STATE_ERROR);
 
   if (RequestDone(*request))
     HandleRequestDone(label, request);
 }
 
 void MediaStreamManager::StopStreamFromUI(const std::string& label) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
-  DeviceRequests::iterator it = requests_.find(label);
-  if (it == requests_.end())
+  DeviceRequest* request = FindRequest(label);
+  if (!request)
     return;
 
   // Notify renderers that the stream has been stopped.
-  if (it->second->requester)
-    it->second->requester->StopGeneratedStream(
-        it->second->request.render_view_id,
-        label);
+  if (request->requester) {
+    request->requester->StopGeneratedStream(request->request.render_view_id,
+                                            label);
+  }
 
   CancelRequest(label);
 }
 
 void MediaStreamManager::UseFakeDevice() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   video_capture_manager()->UseFakeDevice();
   audio_input_device_manager()->UseFakeDevice();
 }
 
 void MediaStreamManager::UseFakeUI(scoped_ptr<FakeMediaStreamUIProxy> fake_ui) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   use_fake_ui_ = true;
   fake_ui_ = fake_ui.Pass();
 }
 
 void MediaStreamManager::WillDestroyCurrentMessageLoop() {
+  DVLOG(3) << "MediaStreamManager::WillDestroyCurrentMessageLoop()";
   DCHECK_EQ(base::MessageLoop::current(), io_loop_);
   DCHECK(requests_.empty());
   if (device_thread_) {
     StopMonitoring();
 
     video_capture_manager_->Unregister();
     audio_input_device_manager_->Unregister();
     device_thread_.reset();
   }
 
@@ skipping 81 matching lines @@
   }
 
   // Always do enumeration even though some enumeration is in progress,
   // because those enumeration commands could be sent before these devices
   // change.
   ++active_enumeration_ref_count_[stream_type];
   GetDeviceManager(stream_type)->EnumerateDevices(stream_type);
 }
 
 }  // namespace content