USB音频设备注册表HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaCategories下GUID分析

windows系统下的注册表：

计算机\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaCategories

在很多的GUID,从MediaCategories来看，是多媒体设备的目录分类，所以以下的GUID应与多媒体设备相关。

该目录下，后缀符合以下格式的GUID即为音频设备：

{xxxxxxxx-xxxx-xxxx-a72f-a5bf64c86eba}

其内容解释为：

#define INIT_USBAUDIO_PRODUCT_NAME    (         guid,
     vid,
     pid,
     strIndex 
)        
Value:
{\
    (guid)->Data1 = 0XFC575048 + (USHORT)(vid);\
    (guid)->Data2 = 0x2E08     + (USHORT)(pid);\
    (guid)->Data3 = 0x463B     + (USHORT)(strIndex);\
    (guid)->Data4[0] = 0xA7;\
    (guid)->Data4[1] = 0x2F;\
    (guid)->Data4[2] = 0xA5;\
    (guid)->Data4[3] = 0xBF;\
    (guid)->Data4[4] = 0x64;\
    (guid)->Data4[5] = 0xC8;\
    (guid)->Data4[6] = 0x6E;\
    (guid)->Data4[7] = 0xBA;\
}

该GUID下一般有一键名为Name的REG_SZ类型的字符串，其值内容为USB设备描述符字符串iProduct对应的字符串。

根据REACTOS源代码，另外几个宏如下：

VID

#define INIT_USBAUDIO_MID(guid, id )        
{\
    (guid)->Data1 = 0x4e1cecd2 + (USHORT)(id);\
    (guid)->Data2 = 0x1679;\
    (guid)->Data3 = 0x463b;\
    (guid)->Data4[0] = 0xa7;\
    (guid)->Data4[1] = 0x2f;\
    (guid)->Data4[2] = 0xa5;\
    (guid)->Data4[3] = 0xbf;\
    (guid)->Data4[4] = 0x64;\
    (guid)->Data4[5] = 0xc8;\
    (guid)->Data4[6] = 0x6e;\
    (guid)->Data4[7] = 0xba;\
}

PID

#define INIT_USBAUDIO_PID    (         guid,    id )        
{\
    (guid)->Data1 = 0xabcc5a5e + (USHORT)(id);\
    (guid)->Data2 = 0xc263;\
    (guid)->Data3 = 0x463b;\
    (guid)->Data4[0] = 0xa7;\
    (guid)->Data4[1] = 0x2f;\
    (guid)->Data4[2] = 0xa5;\
    (guid)->Data4[3] = 0xbf;\
    (guid)->Data4[4] = 0x64;\
    (guid)->Data4[5] = 0xc8;\
    (guid)->Data4[6] = 0x6e;\
    (guid)->Data4[7] = 0xba;\
}

idProduct

INIT_USBAUDIO_PRODUCT_NAME
#define INIT_USBAUDIO_PRODUCT_NAME    (guid,    vid,    pid,     strIndex)        
{\
    (guid)->Data1 = 0XFC575048 + (USHORT)(vid);\
    (guid)->Data2 = 0x2E08     + (USHORT)(pid);\
    (guid)->Data3 = 0x463B     + (USHORT)(strIndex);\
    (guid)->Data4[0] = 0xA7;\
    (guid)->Data4[1] = 0x2F;\
    (guid)->Data4[2] = 0xA5;\
    (guid)->Data4[3] = 0xBF;\
    (guid)->Data4[4] = 0x64;\
    (guid)->Data4[5] = 0xC8;\
    (guid)->Data4[6] = 0x6E;\
    (guid)->Data4[7] = 0xBA;\
}

参考文章:https://learn.microsoft.com/zh-cn/windows-hardware/drivers/audio/friendly-names-for-audio-endpoint-devices