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# GetShapeFiltVolInputHeadroom

> GetShapeFiltVolInputHeadroom

# GetShapeFiltVolInputHeadroom

获取输入余量(headroom)。

## 语法

```cpp theme={null}
SHAPE_FILTER_HEADROOM GetShapeFiltVolInputHeadroom(  
         const SHAPE_FILTVOL_CONTEXT* context  
)  
```

### 参数

*context*   \_In\_\
类型:[SHAPE\_FILTVOL\_CONTEXT](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/structs/shape_filtvol_context.md)\*

指向 [SHAPE\_FILTVOL\_CONTEXT](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/structs/shape_filtvol_context.md) 对象的指针。

### 返回值

类型:SHAPE\_FILTER\_HEADROOM

[SHAPE\_FILTER\_HEADROOM](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/enums/shape_filter_headroom.md) 枚举的一个成员。

## 注解

状态变量滤波器的本质使其可能产生共振,导致中间值超过 1.0(或 -1.0)。为缓解中间值饱和带来的问题,FLTVOL 模块具备可编程的余量缩放,该缩放会应用于输入信号,并在输出时进行补偿。

有关详细信息,请参阅 [SHAPE 概述](https://docs.xbox.com/zh-CN/build/console-features/audio/overviews/shape-overview.md) 的 [滤波器/音量模块 (FLTVOL)](https://docs.xbox.com/zh-CN/build/console-features/audio/overviews/shape-overview.md#ID4EBH) 部分。

## 要求

**头文件:** shapefiltvolcontext.h

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

## 另请参阅

[SetShapeFiltVolInputHeadroom](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/functions/setshapefiltvolinputheadroom.md)\
[ShapeFiltVolContext](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/shapefiltvolcontext_members.md)


## Related topics

- [SetShapeFiltVolInputHeadroom](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/functions/setshapefiltvolinputheadroom.md)
- [SHAPE_FILTER_HEADROOM](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/enums/shape_filter_headroom.md)
- [ShapeFiltVolContext](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/shapefiltvolcontext_members.md)
- [GetShapeFiltVolInternalSaturate](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/functions/getshapefiltvolinternalsaturate.md)
- [GetShapeFiltVolQ](https://docs.xbox.com/zh-CN/reference/audio/shapefiltvolcontext/functions/getshapefiltvolq.md)