Adds Core Audio Utility methods for Windows

media/audio/win/core_audio_util_win.cc

Index: media/audio/win/core_audio_util_win.cc
diff --git a/media/audio/win/core_audio_util_win.cc b/media/audio/win/core_audio_util_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4ff164251be965f13700d7df5cce1a5dcecb4955
--- /dev/null
+++ b/media/audio/win/core_audio_util_win.cc
@@ -0,0 +1,236 @@
+// 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 "media/audio/win/core_audio_util_win.h"
+
+#include <Audioclient.h>
+#include <Functiondiscoverykeys_devpkey.h>
+
+#include "base/logging.h"
+#include "base/stringprintf.h"
+#include "base/utf_string_conversions.h"
+#include "base/win/scoped_co_mem.h"
+#include "base/win/windows_version.h"
+
+using base::win::ScopedCoMem;
+
+namespace media {
+namespace win {
+
+#define PRINT(sz, ...) wprintf(sz L"\n", __VA_ARGS__);
+
+class ScopedPropertyVariant {
+ public:
+  ScopedPropertyVariant() {
+    PropVariantInit(&prop_);
+  }
+  ~ScopedPropertyVariant() {
+    PropVariantClear(&prop_);
+  }
+
+  PROPVARIANT* Get() {
+    return &prop_;
+  }
+
+ private:
+  PROPVARIANT prop_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedPropertyVariant);
+};
+
+bool CoreAudioIsSupported() {
+  // Note that Windows Server 2003 does not support Windows Core Audio.
+  return (base::win::GetVersion() >= base::win::VERSION_VISTA);
+}
+
+int NumberOfActiveAudioDevices(EDataFlow data_flow) {
+  // Create the IMMDeviceEnumerator interface.
+  ScopedComPtr<IMMDeviceEnumerator> device_enumerator =
+      CreateDeviceEnumerator();
+  if (!device_enumerator)
+    return 0;
+
+  // Generate a collection of active (present and not disabled) audio endpoint
+  // devices for the specified data-flow direction.
+  // This method will succeed even if all devices are disabled.
+  ScopedComPtr<IMMDeviceCollection> collection;
+  HRESULT hr = device_enumerator->EnumAudioEndpoints(data_flow,
+                                                     DEVICE_STATE_ACTIVE,
+                                                     collection.Receive());
+  if (FAILED(hr)) {
+    LOG(ERROR) << "IMMDeviceCollection::EnumAudioEndpoints: " << std::hex << hr;
+    return 0;
+  }
+
+  // Retrieve the number of active audio devices for the specified direction
+  UINT number_of_active_devices = 0;
+  collection->GetCount(&number_of_active_devices);
+  std::string flow = (data_flow == eCapture) ? "[in ] " : "[out] ";
+  DVLOG(1) << flow << "number of devices: " << number_of_active_devices;
+
+  return static_cast<int>(number_of_active_devices);
+}
+
+ScopedComPtr<IMMDeviceEnumerator> CreateDeviceEnumerator() {
+  ScopedComPtr<IMMDeviceEnumerator> device_enumerator;
+  HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator),
+                                NULL,
+                                CLSCTX_INPROC_SERVER,
+                                __uuidof(IMMDeviceEnumerator),
+                                device_enumerator.ReceiveVoid());
+  LOG_IF(ERROR, FAILED(hr)) << "CoCreateInstance(IMMDeviceEnumerator): "
+                            << std::hex << hr;
+  return device_enumerator;
+}
+
+ScopedComPtr<IMMDevice> CreateDefaultAudioDevice(EDataFlow data_flow,
+                                                 ERole role) {
+  ScopedComPtr<IMMDevice> endpoint_device;
+
+  // Create the IMMDeviceEnumerator interface.
+  ScopedComPtr<IMMDeviceEnumerator> device_enumerator =
+      CreateDeviceEnumerator();
+  if (!device_enumerator)
+    return endpoint_device;
+
+  // Retrieve the default audio endpoint for the specified data-flow
+  // direction and role.
+  HRESULT hr = device_enumerator->GetDefaultAudioEndpoint(
+      data_flow, role, endpoint_device.Receive());
+
+  if (FAILED(hr)) {
+    LOG(ERROR) << "IMMDeviceEnumerator::GetDefaultAudioEndpoint: "
+               << std::hex << hr;
+    return endpoint_device;
+  }
+
+  // Verify that the audio endpoint device is active, i.e., that the audio
+  // adapter that connects to the endpoint device is present and enabled.
+  DWORD state = DEVICE_STATE_DISABLED;
+  hr = endpoint_device->GetState(&state);
+  if (SUCCEEDED(hr)) {
+    if (!(state & DEVICE_STATE_ACTIVE)) {
+      LOG(ERROR) << "Selected endpoint device is not active";
+      endpoint_device.Release();
+    }
+  }
+  return endpoint_device;
+}
+
+ScopedComPtr<IMMDevice> CreateAudioDevice(const std::string& device_id) {
+  ScopedComPtr<IMMDevice> endpoint_device;
+
+  // Create the IMMDeviceEnumerator interface.
+  ScopedComPtr<IMMDeviceEnumerator> device_enumerator =
+      CreateDeviceEnumerator();
+  if (!device_enumerator)
+    return endpoint_device;
+
+  // Retrieve an audio device specified by an endpoint device-identification
+  // string.
+  HRESULT hr = device_enumerator->GetDevice(UTF8ToUTF16(device_id).c_str(),
+                                            endpoint_device.Receive());
+  LOG_IF(ERROR, FAILED(hr)) << "IMMDeviceEnumerator::GetDevice: "
+                            << std::hex << hr;
+  return endpoint_device;
+}
+
+HRESULT GetAudioDeviceName(IMMDevice* device, AudioDeviceName* name) {
+  DCHECK(device);
+  AudioDeviceName device_name;
+
+  // Retrieve unique name of endpoint device.
+  // Example: "{0.0.1.00000000}.{8db6020f-18e3-4f25-b6f5-7726c9122574}".
+  ScopedCoMem<WCHAR> endpoint_device_id;
+  HRESULT hr = device->GetId(&endpoint_device_id);
+  if (FAILED(hr))
+    return hr;
+  device_name.unique_id = WideToUTF8(static_cast<WCHAR*>(endpoint_device_id));
+
+  // Retrieve user-friendly name of endpoint device.
+  // Example: "Microphone (Realtek High Definition Audio)".
+  ScopedComPtr<IPropertyStore> properties;
+  hr = device->OpenPropertyStore(STGM_READ, properties.Receive());
+  if (FAILED(hr))
+    return hr;
+  PROPVARIANT friendly_name;
+  PropVariantInit(&friendly_name);
+  hr = properties->GetValue(PKEY_Device_FriendlyName, &friendly_name);
+  if (FAILED(hr))
+    return hr;
+  if (friendly_name.vt == VT_LPWSTR && friendly_name.pwszVal) {
+    device_name.device_name = WideToUTF8(friendly_name.pwszVal);
+  }
+  PropVariantClear(&friendly_name);
+
+  *name = device_name;
+  DVLOG(1) << "friendly name: " << device_name.device_name;
+  DVLOG(1) << "unique id    : " << device_name.unique_id;
+  return hr;
+}
+
+std::string GetFriendlyName(const std::string& device_id) {
+  std::string name;
+
+  ScopedComPtr<IMMDevice> audio_device = CreateAudioDevice(device_id);
+  if (!audio_device)
+    return name;
+
+  AudioDeviceName device_name;
+  HRESULT hr = GetAudioDeviceName(audio_device, &device_name);
+  if (FAILED(hr))
+    return name;
+
+  name = device_name.device_name;
+  return name;
+}
+
+bool IsDeviceDefault(EDataFlow flow, ERole role, std::string device_id) {
+  ScopedComPtr<IMMDevice> device = CreateDefaultAudioDevice(flow, role);
+  if (!device)
+    return false;
+
+  ScopedCoMem<WCHAR> default_device_id;
+  HRESULT hr = device->GetId(&default_device_id);
+  if (FAILED(hr))
+    return false;
+
+  std::string str_default = WideToUTF8(static_cast<WCHAR*>(default_device_id));
+  if (device_id.compare(str_default) != 0) {
+    return false;
+  }
+  return true;
+}
+
+EDataFlow GetDataFlow(IMMDevice* device) {
+  if (!device)
+    return eAll;
+
+  ScopedComPtr<IMMEndpoint> endpoint;
+  device->QueryInterface(endpoint.Receive());
+
+  EDataFlow data_flow;
+  HRESULT hr = endpoint->GetDataFlow(&data_flow);
+  if (FAILED(hr)) {
+    LOG(ERROR) << "IMMEndpoint::GetDataFlow: " << std::hex << hr;
+    return eAll;
+  }
+  return data_flow;
+}
+
+ScopedComPtr<IAudioClient> CreateAudioClient(IMMDevice* audio_device) {
+  ScopedComPtr<IAudioClient> audio_client;
+
+  // Creates and activates an IAudioClient COM object given the selected
+  // endpoint device.
+  HRESULT hr = audio_device->Activate(__uuidof(IAudioClient),
+                                      CLSCTX_INPROC_SERVER,
+                                      NULL,
+                                      audio_client.ReceiveVoid());
+  LOG_IF(ERROR, FAILED(hr)) << "IMMDevice::Activate: " << std::hex << hr;
+  return audio_client;
+}
+
+}  // namespace win
+}  // namespace media