如何以编程方式为应用程序设置默认的输入和输出音频设备? [英] How can I programmatically set the default input and output audio device for an application?
问题描述
如果我转到Windows 10(1803)计算机上的设置"，则可以访问页面(应用程序音量和设备首选项")，该页面可以让我为正在运行的应用程序设置默认的输入和输出设备.
If I go to Settings on a Windows 10 (1803) computer, I have access to a page ("App Volume and Device Preferences") that lets me set the default input and output device for a running application.
如何通过编程方式设置这些选项?
How can I set these options programmatically?
相关:
- 设置特定应用程序的音频终结点设备(通过编程)
似乎是指一个更具体的问题，并且没有答案. - 控制应用音量和设备偏好设置""菜单，可使用python 3.6或任何语言(Windows)从设置中进行设置.自动切换App音频设备
网站范围太广，位置错误. -
IAudioSessionControl2及相关家族
允许阅读设备并设置音量和静音，但似乎不允许更改设备 - SoundSwitch的GitHub问题页面也在寻找API
Implies API没有经过设计证明(默认设备由用户控制)
推荐答案
在这里您可以枚举所有播放设备
Here you can enumerate all the playback devices
#include <windows.h>
#include <mmsystem.h>
#include <iostream>
using namespace std;
#pragma comment(lib, "Winmm.lib")
int main()
{
int nSoundCardCount = waveOutGetNumDevs();
for (int i = 0; i < nSoundCardCount; i++)
{
WAVEOUTCAPS woc;
waveOutGetDevCaps(i, &woc, sizeof(woc));
cout << woc.szPname << endl;
}
system("pause");
return 0;
}
在这里，您需要使用PolicyConfig.h和SetDefaultAudioPlaybackDevice来添加.h文件和接口.请参考此项目
1.添加头文件 PolicyConfig.h
2.添加头文件和界面.
2.Add the head file and interface.
#include "Mmdeviceapi.h"
#include "PolicyConfig.h"
#include "Propidl.h"
#include "Functiondiscoverykeys_devpkey.h"
HRESULT SetDefaultAudioPlaybackDevice( LPCWSTR devID )
{
IPolicyConfigVista *pPolicyConfig;
ERole reserved = eConsole;
HRESULT hr = CoCreateInstance(__uuidof(CPolicyConfigVistaClient),
NULL, CLSCTX_ALL, __uuidof(IPolicyConfigVista), (LPVOID *)&pPolicyConfig);
if (SUCCEEDED(hr))
{
hr = pPolicyConfig->SetDefaultEndpoint(devID, reserved);
pPolicyConfig->Release();
}
return hr;
}
3.使用上面的界面编写用于设置默认输出设备的函数.
3.Use the above interface to write a function to set the default output device.
这是MFC项目.也许你需要改变.
It's MFC Project. Maybe you need to change.
需要设置哪个输出设备，您可以自己修改宏的内容.我使用 waveOutGetDevCaps()
Which output device needs to be set, you can modify the content of the macro yourself.
I get the name of output device using waveOutGetDevCaps()
//Set the default audio playback device
#define DEF_AUDIO_NAME _T("Speakers (2- Logitech USB Heads") //modify it, my device is Speakers (2- Logitech USB Heads
void InitDefaultAudioDevice()
{
HRESULT hr = CoInitialize(NULL);
if (SUCCEEDED(hr))
{
IMMDeviceEnumerator *pEnum = NULL;
// Create a multimedia device enumerator.
hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL,
CLSCTX_ALL, __uuidof(IMMDeviceEnumerator), (void**)&pEnum);
if (SUCCEEDED(hr))
{
//Determine if it is the default audio device
bool bExit = false;
IMMDevice *pDefDevice = NULL;
hr = pEnum->GetDefaultAudioEndpoint(eRender, eMultimedia,&pDefDevice);
if (SUCCEEDED(hr))
{
IPropertyStore *pStore;
hr = pDefDevice->OpenPropertyStore(STGM_READ, &pStore);
if (SUCCEEDED(hr))
{
PROPVARIANT friendlyName;
PropVariantInit(&friendlyName);
hr = pStore->GetValue(PKEY_Device_FriendlyName, &friendlyName);
if (SUCCEEDED(hr))
{
CString strTmp = friendlyName.pwszVal;
if (strTmp.Find(DEF_AUDIO_NAME) != -1)
{
bExit = true;
}
PropVariantClear(&friendlyName);
}
pStore->Release();
}
pDefDevice->Release();
}
if (bExit)
{
pEnum->Release();
return;
}
IMMDeviceCollection *pDevices;
// Enumerate the output devices.
hr = pEnum->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &pDevices);
if (SUCCEEDED(hr))
{
UINT count;
pDevices->GetCount(&count);
if (SUCCEEDED(hr))
{
for (int i = 0; i < count; i++)
{
bool bFind = false;
IMMDevice *pDevice;
hr = pDevices->Item(i, &pDevice);
if (SUCCEEDED(hr))
{
LPWSTR wstrID = NULL;
hr = pDevice->GetId(&wstrID);
if (SUCCEEDED(hr))
{
IPropertyStore *pStore;
hr = pDevice->OpenPropertyStore(STGM_READ, &pStore);
if (SUCCEEDED(hr))
{
PROPVARIANT friendlyName;
PropVariantInit(&friendlyName);
hr = pStore->GetValue(PKEY_Device_FriendlyName, &friendlyName);
if (SUCCEEDED(hr))
{
// if no options, print the device
// otherwise, find the selected device and set it to be default
CString strTmp = friendlyName.pwszVal;
if (strTmp.Find(DEF_AUDIO_NAME) != -1)
{
SetDefaultAudioPlaybackDevice(wstrID);
bFind = true;
}
PropVariantClear(&friendlyName);
}
pStore->Release();
}
}
pDevice->Release();
}
if (bFind)
{
break;
}
}
}
pDevices->Release();
}
pEnum->Release();
}
}
CoUninitialize();
}
此样本只能更改主音量的输出.我不知道它是否可以满足您的要求?如果您需要更改其他应用程序，则必须探索一段时间.
This sample can only change the output of Master volume. I don't know whether it can meet your requirements? If you need to change other apps, you have to explore for a while.
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