Report default input and communication device names on Windows

This CL adds to AudioManagerWin implementations of the following
methods:
* GetDefaultInputDeviceID
* GetCommunicationsInputDeviceID
* GetCommunicationsOutputDeviceID

Bug: 780492
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I22c71f79695de8930ccb0d9c3d7ed2ba56ebdf23
Reviewed-on: https://chromium-review.googlesource.com/811184Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523731}

media/audio/audio_manager_base.cc

@@ -161,7 +161,7 @@ void AudioManagerBase::GetAudioDeviceDescriptions(
   for (const auto& name : device_names) {
     if (name.unique_id == real_default_device_id)
       real_default_name = name.device_name;
-    else if (name.unique_id == real_communications_device_id)
+    if (name.unique_id == real_communications_device_id)
       real_communications_name = name.device_name;
   }
 

media/audio/win/audio_manager_win.cc

@@ -252,10 +252,22 @@ AudioInputStream* AudioManagerWin::MakeLowLatencyInputStream(
   return new WASAPIAudioInputStream(this, params, device_id, log_callback);
 }
 
+std::string AudioManagerWin::GetDefaultInputDeviceID() {
+  return CoreAudioUtil::GetDefaultInputDeviceID();
+}
+
 std::string AudioManagerWin::GetDefaultOutputDeviceID() {
   return CoreAudioUtil::GetDefaultOutputDeviceID();
 }
 
+std::string AudioManagerWin::GetCommunicationsInputDeviceID() {
+  return CoreAudioUtil::GetCommunicationsInputDeviceID();
+}
+
+std::string AudioManagerWin::GetCommunicationsOutputDeviceID() {
+  return CoreAudioUtil::GetCommunicationsOutputDeviceID();
+}
+
 AudioParameters AudioManagerWin::GetPreferredOutputStreamParameters(
     const std::string& output_device_id,
     const AudioParameters& input_params) {

media/audio/win/audio_manager_win.h

@@ -51,7 +51,10 @@ class MEDIA_EXPORT AudioManagerWin : public AudioManagerBase {
       const AudioParameters& params,
       const std::string& device_id,
       const LogCallback& log_callback) override;
+  std::string GetDefaultInputDeviceID() override;
   std::string GetDefaultOutputDeviceID() override;
+  std::string GetCommunicationsInputDeviceID() override;
+  std::string GetCommunicationsOutputDeviceID() override;
 
  protected:
   void ShutdownOnAudioThread() override;

media/audio/win/core_audio_util_win.cc

@@ -477,12 +477,30 @@ ComPtr<IMMDeviceEnumerator> CoreAudioUtil::CreateDeviceEnumerator() {
                                         base::BindRepeating(&LogUMAEmptyCb));
 }
 
+std::string CoreAudioUtil::GetDefaultInputDeviceID() {
+  ComPtr<IMMDevice> device(CreateDevice(
+      AudioDeviceDescription::kDefaultDeviceId, eCapture, eConsole));
+  return device.Get() ? GetDeviceID(device.Get()) : std::string();
+}
+
 std::string CoreAudioUtil::GetDefaultOutputDeviceID() {
   ComPtr<IMMDevice> device(CreateDevice(
       AudioDeviceDescription::kDefaultDeviceId, eRender, eConsole));
   return device.Get() ? GetDeviceID(device.Get()) : std::string();
 }
 
+std::string CoreAudioUtil::GetCommunicationsInputDeviceID() {
+  ComPtr<IMMDevice> device(
+      CreateDevice(std::string(), eCapture, eCommunications));
+  return device.Get() ? GetDeviceID(device.Get()) : std::string();
+}
+
+std::string CoreAudioUtil::GetCommunicationsOutputDeviceID() {
+  ComPtr<IMMDevice> device(
+      CreateDevice(std::string(), eRender, eCommunications));
+  return device.Get() ? GetDeviceID(device.Get()) : std::string();
+}
+
 HRESULT CoreAudioUtil::GetDeviceName(IMMDevice* device, AudioDeviceName* name) {
   // Retrieve unique name of endpoint device.
   // Example: "{0.0.1.00000000}.{8db6020f-18e3-4f25-b6f5-7726c9122574}".

media/audio/win/core_audio_util_win.h

@@ -67,9 +67,13 @@ class MEDIA_EXPORT CoreAudioUtil {
   static Microsoft::WRL::ComPtr<IMMDevice>
   CreateDevice(const std::string& device_id, EDataFlow data_flow, ERole role);
 
-  // Returns the device id of the default output device or an empty string
-  // if no such device exists or if the default device has been disabled.
+  // These functions return the device id of the default or communications
+  // input/output device, or an empty string if no such device exists or if the
+  // device has been disabled.
+  static std::string GetDefaultInputDeviceID();
   static std::string GetDefaultOutputDeviceID();
+  static std::string GetCommunicationsInputDeviceID();
+  static std::string GetCommunicationsOutputDeviceID();
 
   // Returns the unique ID and user-friendly name of a given endpoint device.
   // Example: "{0.0.1.00000000}.{8db6020f-18e3-4f25-b6f5-7726c9122574}", and