> ## Documentation Index
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# SHAPE_MIXBUFFER_ATTENUATION

> SHAPE_MIXBUFFER_ATTENUATION

# SHAPE\_MIXBUFFER\_ATTENUATION

分配混音缓冲区时应用的衰减。

## 语法

```cpp theme={null}
enum SHAPE_MIXBUFFER_ATTENUATION    
{  
    SHAPE_MIXBUFFER_ATTENUATION_0_DB,  
    SHAPE_MIXBUFFER_ATTENUATION_6_DB,  
    SHAPE_MIXBUFFER_ATTENUATION_12_DB,  
    SHAPE_MIXBUFFER_ATTENUATION_18_DB,  
    SHAPE_MIXBUFFER_ATTENUATION_24_DB,  
    SHAPE_MIXBUFFER_ATTENUATION_30_DB,  
    SHAPE_MIXBUFFER_ATTENUATION_36_DB,  
    SHAPE_MIXBUFFER_ATTENUATION_42_DB  
}  
```

## 常量

| 常量                                    | 说明        |
| ------------------------------------- | --------- |
| SHAPE\_MIXBUFFER\_ATTENUATION\_0\_DB  | 无衰减。      |
| SHAPE\_MIXBUFFER\_ATTENUATION\_6\_DB  | 6 dB 衰减。  |
| SHAPE\_MIXBUFFER\_ATTENUATION\_12\_DB | 12 dB 衰减。 |
| SHAPE\_MIXBUFFER\_ATTENUATION\_18\_DB | 18 dB 衰减。 |
| SHAPE\_MIXBUFFER\_ATTENUATION\_24\_DB | 24 dB 衰减。 |
| SHAPE\_MIXBUFFER\_ATTENUATION\_30\_DB | 30 dB 衰减。 |
| SHAPE\_MIXBUFFER\_ATTENUATION\_36\_DB | 36 dB 衰减。 |
| SHAPE\_MIXBUFFER\_ATTENUATION\_42\_DB | 42 dB 衰减。 |

## 注解

此枚举由 `SetCommand`、`GetAttenuationText`、`SetProperty` 和 `ConvertAttenuation` 等函数使用。有关用于引导音频控制处理器的流图的详细信息,请参阅 [ACP 概述](/build/console-features/audio/overviews/acp-overview)。有关可扩展硬件音频处理引擎功能的详细信息,请参阅 [SHAPE 概述](/build/console-features/audio/overviews/shape-overview)。

## 要求

**头文件:** shapeflowgraph.h

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

## 另请参阅

[XAudio2](/build/console-features/audio/overviews/xaudio2-overview)

[shapeflowgraph](/reference/audio/shapeflowgraph/shapeflowgraph_members)


## Related topics

- [ShapeFlowGraph](/zh-CN/reference/audio/shapeflowgraph/shapeflowgraph_members.md)
- [SetShapeAllocMixBufferCommand](/zh-CN/reference/audio/shapeflowgraph/functions/setshapeallocmixbuffercommand.md)
- [SHAPE_FLOWGRAPH_ALLOC_MIXBUFFER_COMMAND](/zh-CN/reference/audio/shapeflowgraph/structs/shape_flowgraph_alloc_mixbuffer_command.md)
- [SHAPE_FLOWGRAPH_COMMAND](/zh-CN/reference/audio/shapeflowgraph/structs/shape_flowgraph_command.md)
- [SHAPE_FLOWGRAPH_COMMAND_TYPE](/zh-CN/reference/audio/shapeflowgraph/enums/shape_flowgraph_command_type.md)