这需要一个插件。由于这个问题是针对Windows的,所以你可以使用IAudioEndpointVolume https://msdn.microsoft.com/en-us/library/aa964574.aspx建立一个C++ 插件 https://stackoverflow.com/questions/49793560/build-c-plugin-for-unity/49795660?s=1%7C47.3947#49795660然后从 C# 调用它。This https://blogs.msdn.microsoft.com/larryosterman/2007/03/06/how-do-i-change-the-master-volume-in-windows-vista/帖子有一个有效的 C++ 示例,说明如何使用以下命令更改音量IAudioEndpointVolume
您可以使用它作为创建 C++ 插件的基础源。
我已经清理了该代码,然后将其转换为 dll 插件,并将 DLL 放置在 Assets/Plugins 文件夹中。您可以看到如何构建 C++ 插件here https://stackoverflow.com/questions/49793560/build-c-plugin-for-unity/49795660?s=1%7C47.3947#49795660.
C++代码:
#include "stdafx.h"
#include <windows.h>
#include <mmdeviceapi.h>
#include <endpointvolume.h>
#define DLLExport __declspec(dllexport)
extern "C"
{
enum class VolumeUnit {
Decibel,
Scalar
};
//Gets volume
DLLExport float GetSystemVolume(VolumeUnit vUnit) {
HRESULT hr;
// -------------------------
CoInitialize(NULL);
IMMDeviceEnumerator *deviceEnumerator = NULL;
hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);
IMMDevice *defaultDevice = NULL;
hr = deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &defaultDevice);
deviceEnumerator->Release();
deviceEnumerator = NULL;
IAudioEndpointVolume *endpointVolume = NULL;
hr = defaultDevice->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
defaultDevice->Release();
defaultDevice = NULL;
float currentVolume = 0;
if (vUnit == VolumeUnit::Decibel) {
//Current volume in dB
hr = endpointVolume->GetMasterVolumeLevel(¤tVolume);
}
else if (vUnit == VolumeUnit::Scalar) {
//Current volume as a scalar
hr = endpointVolume->GetMasterVolumeLevelScalar(¤tVolume);
}
endpointVolume->Release();
CoUninitialize();
return currentVolume;
}
//Sets volume
DLLExport void SetSystemVolume(double newVolume, VolumeUnit vUnit) {
HRESULT hr;
// -------------------------
CoInitialize(NULL);
IMMDeviceEnumerator *deviceEnumerator = NULL;
hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);
IMMDevice *defaultDevice = NULL;
hr = deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &defaultDevice);
deviceEnumerator->Release();
deviceEnumerator = NULL;
IAudioEndpointVolume *endpointVolume = NULL;
hr = defaultDevice->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
defaultDevice->Release();
defaultDevice = NULL;
if (vUnit == VolumeUnit::Decibel)
hr = endpointVolume->SetMasterVolumeLevel((float)newVolume, NULL);
else if (vUnit == VolumeUnit::Scalar)
hr = endpointVolume->SetMasterVolumeLevelScalar((float)newVolume, NULL);
endpointVolume->Release();
CoUninitialize();
}
}
C# 代码:
using System.Runtime.InteropServices;
using UnityEngine;
public class VolumeManager : MonoBehaviour
{
//The Unit to use when getting and setting the volume
public enum VolumeUnit
{
//Perform volume action in decibels</param>
Decibel,
//Perform volume action in scalar
Scalar
}
/// <summary>
/// Gets the current volume
/// </summary>
/// <param name="vUnit">The unit to report the current volume in</param>
[DllImport("ChangeVolumeWindows")]
public static extern float GetSystemVolume(VolumeUnit vUnit);
/// <summary>
/// sets the current volume
/// </summary>
/// <param name="newVolume">The new volume to set</param>
/// <param name="vUnit">The unit to set the current volume in</param>
[DllImport("ChangeVolumeWindows")]
public static extern void SetSystemVolume(double newVolume, VolumeUnit vUnit);
// Use this for initialization
void Start()
{
//Get volume in Decibel
float volumeDecibel = GetSystemVolume(VolumeUnit.Decibel);
Debug.Log("Volume in Decibel: " + volumeDecibel);
//Get volume in Scalar
float volumeScalar = GetSystemVolume(VolumeUnit.Scalar);
Debug.Log("Volume in Scalar: " + volumeScalar);
//Set volume in Decibel
SetSystemVolume(-16f, VolumeUnit.Decibel);
//Set volume in Scalar
SetSystemVolume(0.70f, VolumeUnit.Scalar);
}
}
The GetSystemVolume
函数用于获取当前音量和SetSystemVolume
用于设置它。这个问题适用于 Windows,但您可以使用其他平台的 API 执行类似的操作。
要将其设置为70%
当按下 A 键时:
void Update()
{
if (Input.GetKeyDown(KeyCode.A))
{
//Set Windows Volume 70%
SetSystemVolume(0.70f, VolumeUnit.Scalar);
}
}