管理访问麦克风输入和系统卷 [英] Managed access to microphone input and system volume

问题描述

我希望做三件事情：

访问数据。真的所有我想知道的是由设备感知的声音的总音量。

Access data from the microphone. Really all I want to know is the overall volume of the sound sensed by the device.

设置麦克风增益。

设置系统音量。

我所有的Windows开发人员的经验是C＃/ WPF，所以我想留管理。我并不需要极高的性能和实时处理或任何东西。

All of my windows dev experience is C#/WPF, so I'd like to stay managed. I do not need exceptionally high performance or realtime processing or anything.

我环顾四周，似乎像SlimDX可能是一个很好的包装，但即使没有我不知道从哪里开始。

I've looked around and it seems like SlimDX might be a good wrapper for this, but even there I'm not sure where to start.

当然，它不可能是那么难？

Surely it can't be that hard?

推荐答案

下面是一个链接，显示了如何从C＃访问混音器在Windows：

Here's a link that shows how to access the audio mixer in Windows from C#:

<一个href=\"http://www.$c$cguru.com/csharp/csharp/cs%5Fgraphics/sound/article.php/c10931\">http://www.$c$cguru.com/csharp/csharp/cs_graphics/sound/article.php/c10931

这将让您设定麦克风增益和系统音量。第一部分是有点复杂，但。基本上，你需要开始记录输入（使用的DirectSound或waveInXXXX API [我个人最喜欢的]）。由于每个缓冲区被充满音频，可以计算出均方根为缓冲区，并以此来估算量。

This will let you set the microphone gain and the system volume. The first part is a little more complicated, though. Basically, you need to start recording the input (using DirectSound or the waveInXXXX API [my personal favorite]). As each buffer gets filled with audio, you can calculate the Root Mean Square for the buffer and use this to estimate volume.

修改：这里有一个项目的链接（我已经使用并修改成功，所以我知道它的工作原理）展示了如何使用API​​ waveInXXXX录制音频：

Edit: here's a link to a project (that I've used and modified successfully, so I know it works) that shows how to record audio using the waveInXXXX API:

<一个href=\"http://www.$c$cproject.com/KB/audio-video/cswavrec.aspx?df=90&fid=16677&mpp=25&noise=3&sort=Position&view=Quick&select=3005817\">http://www.$c$cproject.com/KB/audio-video/cswavrec.aspx?df=90&fid=16677&mpp=25&noise=3&sort=Position&view=Quick&select=3005817

编辑2 ：既然我已经厌倦了张贴的联系，这里的计算音频缓冲区的均方根（这里的类型是浮动[]，但它可以是一个实际的公式易于修改以处理短期[]，这是你通常从waveInXXXX获得）：

Edit 2: and since I'm tired of posting links, here's an actual formula for calculating the Root Mean Square of an audio buffer (the type here is float[], but it can be easily modified to handle short[], which is what you'd normally get from waveInXXXX):

public static float RootMeanSquared(ref float[] audio)
{
    double sumOfSquared = 0;
    for (int i = 0; i < audio.Length; i++)
    {
        sumOfSquared += audio[i] * audio[i];
    }
    return (float)Math.Sqrt(sumOfSquared / (double)audio.Length);
}

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