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

# ACP_COMMAND_UPDATE_FILTVOL_CONTEXT_ENTRY

> ACP_COMMAND_UPDATE_FILTVOL_CONTEXT_ENTRY

# ACP\_COMMAND\_UPDATE\_FILTVOL\_CONTEXT\_ENTRY

用于更新 `SHAPE_FILTVOL_CONTEXT` 的条目。

## 语法

```cpp theme={null}
typedef struct ACP_COMMAND_UPDATE_FILTVOL_CONTEXT_ENTRY {  
    UINT32 contextIndex;  
    UINT32 gainTarget;  
    UINT32 qRecipTarget;  
    UINT32 fcTarget;  
} ACP_COMMAND_UPDATE_FILTVOL_CONTEXT_ENTRY  
```

### 成员

*contextIndex*\
类型:UINT32

范围为 0 至 `ACP_MAX_NUM_FILTVOL_CONTEXTS` 的索引。

*gainTarget*\
类型:UINT32

替换 `SHAPE_FILTVOL_CONTEXT::gainTarget` 的现有值。

*qRecipTarget*\
类型:UINT32

替换 `SHAPE_FILTVOL_CONTEXT::qRecipTarget` 的现有值。

*fcTarget*\
类型:UINT32

替换 `SHAPE_FILTVOL_CONTEXT::fcTarget` 的现有值。

## 备注

此结构体由 `ACP_COMMAND_UPDATE_CONTEXTS` 和 `ACP_COMMAND_UPDATE_ALL_CONTEXTS` 命令使用以更新单个 Filter/Volume 上下文。请仅在每个音频帧内使用该命令更新少量上下文;更新大量上下文的效率不高。有关更多详细信息,请参阅 [ACP 概述中的"渲染音频"部分](/build/console-features/audio/overviews/acp-overview#ID4E6C)。

此结构体还包含内联方法:

```cpp theme={null}
inline void SetOutputGainTarget(float outputGainTarget) // Output gain target [-2.0, 2.00] amplitude, not dB
{
    gainTarget = (UINT32)((INT32)(outputGainTarget * SHAPE_Q14)) & 0x0000ffff;
}

inline void SetQTarget(float qTarget) // Bandwidth target
{
    qRecipTarget = (UINT32)((INT32)((1.0f / qTarget) * SHAPE_Q23)) & 0x00ffffff;
}

inline void SetFrequencyTarget(float frequencyTarget) // Frequency target [0, 8000] Hz
{
    fcTarget = (UINT32)((INT32)(2.0f * (float)sin(M_PI * frequencyTarget / SHAPE_SAMPLE_RATE) * SHAPE_Q24)) & 0x00ffffff;
}  
```

## 要求

**头文件:** acphal.h

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

## 另请参阅

[ACP\_COMMAND\_TYPE](/reference/audio/acphal/enums/acp_command_type)\
[SubmitCommand](/reference/audio/acphal/interfaces/IAcpHal/methods/iacphal_submitcommand)\
[AcpHal](/reference/audio/acphal/acphal_members)


## Related topics

- [AcpHal](/zh-CN/reference/audio/acphal/acphal_members.md)
- [ACP_COMMAND_UPDATE_FILTVOL_CONTEXT](/zh-CN/reference/audio/acphal/structs/acp_command_update_filtvol_context.md)
- [ACP_COMMAND_UPDATE_CONTEXTS](/zh-CN/reference/audio/acphal/structs/acp_command_update_contexts.md)
- [ACP_COMMAND_UPDATE_EQCOMP_CONTEXT_ENTRY](/zh-CN/reference/audio/acphal/structs/acp_command_update_eqcomp_context_entry.md)
- [ACP_COMMAND_UPDATE_PCM_CONTEXT_ENTRY](/zh-CN/reference/audio/acphal/structs/acp_command_update_pcm_context_entry.md)