c++ - 如何检查麦克风和扬声器是否来自同一声卡？

Question

我的问题是如何检查麦克风和扬声器是否来自 Windows 平台上的同一个声卡。如果它们来自不同的卡，那么处理时间的逻辑就会不同。我同时使用 DSound 和 WMME API。

Answer 1

WMI 确实提供了一些有关声卡的信息。我还没有发现的是它的付出是否足够。以下脚本使用“ WMI Code Creator ”列出了Win32_SoundDevice对象存储的所有内容：

strComputer = "." 
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\CIMV2") 
Set colItems = objWMIService.ExecQuery( _
    "SELECT * FROM Win32_SoundDevice",,48) 
For Each objItem in colItems 
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Win32_SoundDevice instance"
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Availability: " & objItem.Availability
    Wscript.Echo "Caption: " & objItem.Caption
    Wscript.Echo "ConfigManagerErrorCode: " & objItem.ConfigManagerErrorCode
    Wscript.Echo "ConfigManagerUserConfig: " & objItem.ConfigManagerUserConfig
    Wscript.Echo "CreationClassName: " & objItem.CreationClassName
    Wscript.Echo "Description: " & objItem.Description
    Wscript.Echo "DeviceID: " & objItem.DeviceID
    Wscript.Echo "DMABufferSize: " & objItem.DMABufferSize
    Wscript.Echo "ErrorCleared: " & objItem.ErrorCleared
    Wscript.Echo "ErrorDescription: " & objItem.ErrorDescription
    Wscript.Echo "InstallDate: " & objItem.InstallDate
    Wscript.Echo "LastErrorCode: " & objItem.LastErrorCode
    Wscript.Echo "Manufacturer: " & objItem.Manufacturer
    Wscript.Echo "MPU401Address: " & objItem.MPU401Address
    Wscript.Echo "Name: " & objItem.Name
    Wscript.Echo "PNPDeviceID: " & objItem.PNPDeviceID
    If isNull(objItem.PowerManagementCapabilities) Then
    Wscript.Echo "PowerManagementCapabilities: "
    Else
    Wscript.Echo "PowerManagementCapabilities: " & Join(objItem.PowerManagementCapabilities, ",")
    End If
    Wscript.Echo "PowerManagementSupported: " & objItem.PowerManagementSupported
    Wscript.Echo "ProductName: " & objItem.ProductName
    Wscript.Echo "Status: " & objItem.Status
    Wscript.Echo "StatusInfo: " & objItem.StatusInfo
    Wscript.Echo "SystemCreationClassName: " & objItem.SystemCreationClassName
    Wscript.Echo "SystemName: " & objItem.SystemName
Next

在我的笔记本电脑上运行它会给

-----------------------------------
Win32_SoundDevice instance
-----------------------------------
Availability: 
Caption: ATI Function Driver for High Definition Audio - ATI AA01
ConfigManagerErrorCode: 0
ConfigManagerUserConfig: False
CreationClassName: Win32_SoundDevice
Description: ATI Function Driver for High Definition Audio - ATI AA01
DeviceID: HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1000\5&BB7E0F3&0&0001
DMABufferSize: 
ErrorCleared: 
ErrorDescription: 
InstallDate: 
LastErrorCode: 
Manufacturer: ATI
MPU401Address: 
Name: ATI Function Driver for High Definition Audio - ATI AA01
PNPDeviceID: HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1000\5&BB7E0F3&0&0001
PowerManagementCapabilities: 
PowerManagementSupported: False
ProductName: ATI Function Driver for High Definition Audio - ATI AA01
Status: OK
StatusInfo: 3
SystemCreationClassName: Win32_ComputerSystem
SystemName: BABEL
-----------------------------------
Win32_SoundDevice instance
-----------------------------------
Availability: 
Caption: Conexant High Definition SmartAudio 221
ConfigManagerErrorCode: 0
ConfigManagerUserConfig: False
CreationClassName: Win32_SoundDevice
Description: Conexant High Definition SmartAudio 221
DeviceID: HDAUDIO\FUNC_01&VEN_14F1&DEV_5051&SUBSYS_1179FF5B&REV_1000\4&2DBDAC14&0&0001
DMABufferSize: 
ErrorCleared: 
ErrorDescription: 
InstallDate: 
LastErrorCode: 
Manufacturer: Conexant
MPU401Address: 
Name: Conexant High Definition SmartAudio 221
PNPDeviceID: HDAUDIO\FUNC_01&VEN_14F1&DEV_5051&SUBSYS_1179FF5B&REV_1000\4&2DBDAC14&0&0001
PowerManagementCapabilities: 
PowerManagementSupported: False
ProductName: Conexant High Definition SmartAudio 221
Status: OK
StatusInfo: 3
SystemCreationClassName: Win32_ComputerSystem
SystemName: BABEL

不知道里面有没有什么有用的。这是一个棘手的问题。

Answer 2

假设您有输入和输出设备的 ID，您可以使用类似以下的内容来获取相应的混音器 ID。如果两者相同，则它们都连接到同一个混音器，并且很可能属于同一个物理硬件。

    /// <summary>
    /// Get the ID of the mixer associated with the given input device ID
    /// Returns -1 if no such mixer can be found
    /// </summary>
    static public int GetMixerIdInput(int inputId)
    {
        int mixerId = -1;
        int result = MmeMixerApi.mixerGetID(inputId, ref mixerId, MIXER_OBJECTFLAG.WAVEIN);
        if (((MMError)result != MMError.MMSYSERR_NOERROR) &&
            ((MMError)result != MMError.MMSYSERR_NODRIVER))
        {
            throw new MmeException((MMError)result);
        }
        return mixerId;
    }

    /// <summary>
    /// Get the ID of the mixer associated with the given output device ID
    /// Returns -1 if no such mixer can be found
    /// </summary>
    static public int GetMixerIdOutput(int outputId)
    {
        int mixerId = -1;
        int result = MmeMixerApi.mixerGetID(outputId, ref mixerId, MIXER_OBJECTFLAG.WAVEOUT);
        if (((MMError)result != MMError.MMSYSERR_NOERROR) &&
            ((MMError)result != MMError.MMSYSERR_NODRIVER))
        {
            throw new MmeException((MMError)result);
        }
        return mixerId;
    }

如果您只有输入设备的名称，则可以使用类似以下内容来查找设备 ID：

    /// <summary>
    /// Find the ID of the input device given a name
    /// </summary>
    static public int GetWaveInputId(string name)
    {
        int id = MmeWaveApi.WAVE_MAPPER;
        int devCount = MmeWaveApi.waveInGetNumDevs();
        WAVEINCAPS caps = new WAVEINCAPS();
        for (int dev = 0; (dev < devCount) && (id == MmeWaveApi.WAVE_MAPPER); dev++)
        {
            int result = MmeWaveApi.waveInGetDevCaps(dev, ref caps, Marshal.SizeOf(caps));
            if ((MMError)result == MMError.MMSYSERR_NOERROR)
            {
                if (string.Compare(name, 0, caps.szPname, 0, Math.Min(name.Length, caps.szPname.Length)) == 0)
                {
                    id = dev;
                }
            }
        }
        return id;
    }

Answer 3

永远不要使用 WMI（这里什么都不做） 使用 MM apis。