> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# GetXmaChannelMaskFromStandardMask

> GetXmaChannelMaskFromStandardMask

# GetXmaChannelMaskFromStandardMask

在 `WAVEFORMATEXTENSIBLE` 通道掩码（*audiodef.h* 文件中定义的 `SPEAKER_xxx` 标志的组合）与 XBOX Media Audio (XMA) 通道掩码之间进行转换，仅限于八个可能的扬声器位置。

## 语法

```cpp theme={null}
BYTE GetXmaChannelMaskFromStandardMask(  
         DWORD dwStandardMask  
)  
```

### 参数

*dwStandardMask*   \
类型：DWORD

标准掩码。

### 返回值

类型：BYTE

字节掩码。

## 备注

此函数用于在 `WAVEFORMATEXTENSIBLE` 通道掩码（*audiodefs.h* 文件中定义的 `SPEAKER_xxx` 标志的组合）与 XMA 通道掩码之间进行转换，仅限于八个可能的扬声器位置。

如下方代码示例所示，这些扬声器位置包括左、右、中央、低频、侧左、侧右、后左和后右。

```cpp theme={null}
__inline BYTE GetXmaChannelMaskFromStandardMask(DWORD dwStandardMask)
{
    BYTE bXmaMask = 0;

    if (dwStandardMask & SPEAKER_FRONT_LEFT)    bXmaMask |= XMA_SPEAKER_LEFT;
    if (dwStandardMask & SPEAKER_FRONT_RIGHT)   bXmaMask |= XMA_SPEAKER_RIGHT;
    if (dwStandardMask & SPEAKER_FRONT_CENTER)  bXmaMask |= XMA_SPEAKER_CENTER;
    if (dwStandardMask & SPEAKER_LOW_FREQUENCY) bXmaMask |= XMA_SPEAKER_LFE;
    if (dwStandardMask & SPEAKER_SIDE_LEFT)     bXmaMask |= XMA_SPEAKER_LEFT_SURROUND;
    if (dwStandardMask & SPEAKER_SIDE_RIGHT)    bXmaMask |= XMA_SPEAKER_RIGHT_SURROUND;
    if (dwStandardMask & SPEAKER_BACK_LEFT)     bXmaMask |= XMA_SPEAKER_LEFT_BACK;
    if (dwStandardMask & SPEAKER_BACK_RIGHT)    bXmaMask |= XMA_SPEAKER_RIGHT_BACK;

    return bXmaMask;
}
```

有关 XMA2 的详细信息，请参阅 [XMA2 概述](https://docs.xbox.com/zh-CN/build/console-features/audio/overviews/xma2-overview.md)。有关 XBOX One 音频架构的概述，请参阅**未来之声**：[XBOX One 中的音频架构](https://docs.xbox.com/zh-CN/build/console-features/audio/overviews/xbox-one-audio-architecture.md)。

## 要求

**头文件：** xma2defs.h

**支持的平台：** XBOX One 系列主机和 XBOX Series 主机

## 另请参阅

[GetStandardChannelMaskFromXmaMask](https://docs.xbox.com/zh-CN/reference/audio/xma2defs/functions/getstandardchannelmaskfromxmamask.md)\
[xma2defs](https://docs.xbox.com/zh-CN/reference/audio/xma2defs/xma2defs_members.md)


## Related topics

- [GetStandardChannelMaskFromXmaMask](https://docs.xbox.com/zh-CN/reference/audio/xma2defs/functions/getstandardchannelmaskfromxmamask.md)
- [XMA2Defs](https://docs.xbox.com/zh-CN/reference/audio/xma2defs/xma2defs_members.md)
- [XMA2STREAMFORMAT](https://docs.xbox.com/zh-CN/reference/audio/xma2defs/structs/xma2streamformat.md)
- [get_thread_affinity_mask](https://docs.xbox.com/zh-CN/reference/chat/gamechat2/classes/chat_manager/methods/chat_manager_get_thread_affinity_mask.md)
- [ACP_COMMAND_UPDATE_XMA_CONTEXT](https://docs.xbox.com/zh-CN/reference/audio/acphal/structs/acp_command_update_xma_context.md)