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// Copyright (c) 2011 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 <MMDeviceAPI.h>
#include <mmsystem.h>
#include <Functiondiscoverykeys_devpkey.h> // MMDeviceAPI.h must come first
#include "media/audio/win/audio_manager_win.h"
#include "base/logging.h"
#include "base/utf_string_conversions.h"
#include "base/win/scoped_co_mem.h"
#include "base/win/scoped_comptr.h"
using media::AudioDeviceNames;
using base::win::ScopedComPtr;
using base::win::ScopedCoMem;
bool GetInputDeviceNamesWin(AudioDeviceNames* device_names) {
// It is assumed that this method is called from a COM thread, i.e.,
// CoInitializeEx() is not called here again to avoid STA/MTA conflicts.
ScopedComPtr<IMMDeviceEnumerator> enumerator;
HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator),
NULL,
CLSCTX_INPROC_SERVER,
__uuidof(IMMDeviceEnumerator),
enumerator.ReceiveVoid());
if (FAILED(hr)) {
LOG(WARNING) << "Failed to create IMMDeviceEnumerator: " << std::hex << hr;
return false;
}
// Generate a collection of active audio capture endpoint devices.
// This method will succeed even if all devices are disabled.
ScopedComPtr<IMMDeviceCollection> collection;
hr = enumerator->EnumAudioEndpoints(eCapture,
DEVICE_STATE_ACTIVE,
collection.Receive());
if (FAILED(hr))
return false;
// Retrieve the number of active capture devices.
UINT number_of_active_devices = 0;
collection->GetCount(&number_of_active_devices);
if (number_of_active_devices == 0)
return true;
media::AudioDeviceName device;
// Loop over all active capture devices and add friendly name and
// unique ID to the |device_names| list.
for (UINT i = 0; i < number_of_active_devices; ++i) {
// Retrieve unique name of endpoint device.
// Example: "{0.0.1.00000000}.{8db6020f-18e3-4f25-b6f5-7726c9122574}".
ScopedComPtr<IMMDevice> audio_device;
ScopedCoMem<WCHAR> endpoint_device_id;
hr = collection->Item(i, audio_device.Receive());
if (FAILED(hr))
continue;
audio_device->GetId(&endpoint_device_id);
// Store the unique name.
device.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 = audio_device->OpenPropertyStore(STGM_READ, properties.Receive());
if (SUCCEEDED(hr)) {
PROPVARIANT friendly_name;
PropVariantInit(&friendly_name);
hr = properties->GetValue(PKEY_Device_FriendlyName, &friendly_name);
// Store the user-friendly name.
if (SUCCEEDED(hr) &&
friendly_name.vt == VT_LPWSTR && friendly_name.pwszVal) {
device.device_name = WideToUTF8(friendly_name.pwszVal);
}
PropVariantClear(&friendly_name);
}
// Add combination of user-friendly and unique name to the output list.
device_names->push_back(device);
}
return true;
}
bool GetInputDeviceNamesWinXP(AudioDeviceNames* device_names) {
// Retrieve the number of active waveform input devices.
UINT number_of_active_devices = waveInGetNumDevs();
if (number_of_active_devices == 0)
return true;
media::AudioDeviceName device;
WAVEINCAPS capabilities;
MMRESULT err = MMSYSERR_NOERROR;
// Loop over all active capture devices and add friendly name and
// unique ID to the |device_names| list. Note that, for Wave on XP,
// the "unique" name will simply be a copy of the friendly name since
// there is no safe method to retrieve a unique device name on XP.
for (UINT i = 0; i < number_of_active_devices; ++i) {
// Retrieve the capabilities of the specified waveform-audio input device.
err = waveInGetDevCaps(i, &capabilities, sizeof(capabilities));
if (err != MMSYSERR_NOERROR)
continue;
if (capabilities.szPname != NULL) {
// Store the user-friendly name. Max length is MAXPNAMELEN(=32)
// characters and the name cane be truncated on XP.
// Example: "Microphone (Realtek High Defini".
device.device_name = WideToUTF8(capabilities.szPname);
// Store the "unique" name (we use same as friendly name on Windows XP).
device.unique_id = WideToUTF8(capabilities.szPname);
// Add combination of user-friendly and unique name to the output list.
device_names->push_back(device);
}
}
return true;
}
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