1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include <MMDeviceAPI.h>
7 #include <Functiondiscoverykeys_devpkey.h> // MMDeviceAPI.h must come first
9 #include "media/audio/win/audio_manager_win.h"
11 #include "base/basictypes.h"
12 #include "base/logging.h"
13 #include "base/strings/utf_string_conversions.h"
14 #include "base/win/scoped_co_mem.h"
15 #include "base/win/scoped_comptr.h"
16 #include "base/win/scoped_propvariant.h"
18 using base::win::ScopedComPtr;
19 using base::win::ScopedCoMem;
21 // Taken from Mmddk.h.
22 #define DRV_RESERVED 0x0800
23 #define DRV_QUERYFUNCTIONINSTANCEID (DRV_RESERVED + 17)
24 #define DRV_QUERYFUNCTIONINSTANCEIDSIZE (DRV_RESERVED + 18)
28 static bool GetDeviceNamesWinImpl(EDataFlow data_flow,
29 AudioDeviceNames* device_names) {
30 // It is assumed that this method is called from a COM thread, i.e.,
31 // CoInitializeEx() is not called here again to avoid STA/MTA conflicts.
32 ScopedComPtr<IMMDeviceEnumerator> enumerator;
33 HRESULT hr = enumerator.CreateInstance(__uuidof(MMDeviceEnumerator), NULL,
34 CLSCTX_INPROC_SERVER);
35 DCHECK_NE(CO_E_NOTINITIALIZED, hr);
37 LOG(WARNING) << "Failed to create IMMDeviceEnumerator: " << std::hex << hr;
41 // Generate a collection of active audio endpoint devices.
42 // This method will succeed even if all devices are disabled.
43 ScopedComPtr<IMMDeviceCollection> collection;
44 hr = enumerator->EnumAudioEndpoints(data_flow,
46 collection.Receive());
50 // Retrieve the number of active devices.
51 UINT number_of_active_devices = 0;
52 collection->GetCount(&number_of_active_devices);
53 if (number_of_active_devices == 0)
56 AudioDeviceName device;
58 // Loop over all active devices and add friendly name and
59 // unique ID to the |device_names| list.
60 for (UINT i = 0; i < number_of_active_devices; ++i) {
61 // Retrieve unique name of endpoint device.
62 // Example: "{0.0.1.00000000}.{8db6020f-18e3-4f25-b6f5-7726c9122574}".
63 ScopedComPtr<IMMDevice> audio_device;
64 hr = collection->Item(i, audio_device.Receive());
68 // Store the unique name.
69 ScopedCoMem<WCHAR> endpoint_device_id;
70 audio_device->GetId(&endpoint_device_id);
71 device.unique_id = WideToUTF8(static_cast<WCHAR*>(endpoint_device_id));
73 // Retrieve user-friendly name of endpoint device.
74 // Example: "Microphone (Realtek High Definition Audio)".
75 ScopedComPtr<IPropertyStore> properties;
76 hr = audio_device->OpenPropertyStore(STGM_READ, properties.Receive());
78 base::win::ScopedPropVariant friendly_name;
79 hr = properties->GetValue(PKEY_Device_FriendlyName,
80 friendly_name.Receive());
82 // Store the user-friendly name.
84 friendly_name.get().vt == VT_LPWSTR && friendly_name.get().pwszVal) {
85 device.device_name = WideToUTF8(friendly_name.get().pwszVal);
89 // Add combination of user-friendly and unique name to the output list.
90 device_names->push_back(device);
96 // The waveform API is weird in that it has completely separate but
97 // almost identical functions and structs for input devices vs. output
98 // devices. We deal with this by implementing the logic as a templated
99 // function that takes the functions and struct type to use as
100 // template parameters.
101 template <UINT (__stdcall *NumDevsFunc)(),
103 MMRESULT (__stdcall *DevCapsFunc)(UINT_PTR, CAPSSTRUCT*, UINT)>
104 static bool GetDeviceNamesWinXPImpl(AudioDeviceNames* device_names) {
105 // Retrieve the number of active waveform input devices.
106 UINT number_of_active_devices = NumDevsFunc();
107 if (number_of_active_devices == 0)
110 AudioDeviceName device;
111 CAPSSTRUCT capabilities;
112 MMRESULT err = MMSYSERR_NOERROR;
114 // Loop over all active capture devices and add friendly name and
115 // unique ID to the |device_names| list. Note that, for Wave on XP,
116 // the "unique" name will simply be a copy of the friendly name since
117 // there is no safe method to retrieve a unique device name on XP.
118 for (UINT i = 0; i < number_of_active_devices; ++i) {
119 // Retrieve the capabilities of the specified waveform-audio input device.
120 err = DevCapsFunc(i, &capabilities, sizeof(capabilities));
121 if (err != MMSYSERR_NOERROR)
124 // Store the user-friendly name. Max length is MAXPNAMELEN(=32)
125 // characters and the name cane be truncated on XP.
126 // Example: "Microphone (Realtek High Defini".
127 device.device_name = WideToUTF8(capabilities.szPname);
129 // Store the "unique" name (we use same as friendly name on Windows XP).
130 device.unique_id = device.device_name;
132 // Add combination of user-friendly and unique name to the output list.
133 device_names->push_back(device);
139 bool GetInputDeviceNamesWin(AudioDeviceNames* device_names) {
140 return GetDeviceNamesWinImpl(eCapture, device_names);
143 bool GetOutputDeviceNamesWin(AudioDeviceNames* device_names) {
144 return GetDeviceNamesWinImpl(eRender, device_names);
147 bool GetInputDeviceNamesWinXP(AudioDeviceNames* device_names) {
148 return GetDeviceNamesWinXPImpl<
149 waveInGetNumDevs, WAVEINCAPSW, waveInGetDevCapsW>(device_names);
152 bool GetOutputDeviceNamesWinXP(AudioDeviceNames* device_names) {
153 return GetDeviceNamesWinXPImpl<
154 waveOutGetNumDevs, WAVEOUTCAPSW, waveOutGetDevCapsW>(device_names);
157 std::string ConvertToWinXPInputDeviceId(const std::string& device_id) {
158 UINT number_of_active_devices = waveInGetNumDevs();
159 MMRESULT result = MMSYSERR_NOERROR;
162 for (; i < number_of_active_devices; ++i) {
164 // Get the size (including the terminating NULL) of the endpoint ID of the
166 result = waveInMessage(reinterpret_cast<HWAVEIN>(i),
167 DRV_QUERYFUNCTIONINSTANCEIDSIZE,
168 reinterpret_cast<DWORD_PTR>(&size), NULL);
169 if (result != MMSYSERR_NOERROR)
172 ScopedCoMem<WCHAR> id;
173 id.Reset(static_cast<WCHAR*>(CoTaskMemAlloc(size)));
177 // Get the endpoint ID string for this waveIn device.
178 result = waveInMessage(
179 reinterpret_cast<HWAVEIN>(i), DRV_QUERYFUNCTIONINSTANCEID,
180 reinterpret_cast<DWORD_PTR>(static_cast<WCHAR*>(id)), size);
181 if (result != MMSYSERR_NOERROR)
184 std::string utf8_id = WideToUTF8(static_cast<WCHAR*>(id));
185 // Check whether the endpoint ID string of this waveIn device matches that
186 // of the audio endpoint device.
187 if (device_id == utf8_id)
191 // If a matching waveIn device was found, convert the unique endpoint ID
192 // string to a standard friendly name with max 32 characters.
193 if (i < number_of_active_devices) {
194 WAVEINCAPS capabilities;
196 result = waveInGetDevCaps(i, &capabilities, sizeof(capabilities));
197 if (result == MMSYSERR_NOERROR)
198 return WideToUTF8(capabilities.szPname);
201 return std::string();