在Windows 7中錄製時獲取麥克風聲音級別

Question

我正在實現一個簡單的記錄，播放可以播放和錄製WAV文件的應用程序。
的要求如下：

1）Windows 7中的Visual Studio 2010（或2012），C＃
2）錄製，播放與規範信息的Wav文件：採樣率22050，單聲道，bitspersample 16
3）同時記錄

隨着1）和2可以顯示微聲級），我可以用lib（WINMM.DLL）和mciSendString（）如下

[DllImport("winmm.dll")] 
private static extern long mciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback); 

// Open file to play 
public void open(string file) 
{ 
    string command = "open \"" + file + "\" type waveaudio alias MyWav"; 
    mciSendString(command, null, 0, 0); 
} 

// Start playing 
public void play() 
{ 
    string command = "play MyWav"; 
    mciSendString(command, null, 0, 0); 
} 

// Stop playing 
public void stop() 
{ 
    string command = "stop MyWav"; 
    mciSendString(command, null, 0, 0); 

    command = "close MyWav"; 
    mciSendString(command, null, 0, 0); 
} 

// Start recording 
public void record() 
{ 
    string command = "open new Type waveaudio Alias MyRec"; 
    mciSendString(command, "", 0, 0); 

    command = "set capture time format ms bitspersample 16 channels 1 samplespersec 22050 alignment 4"; 
    mciSendString(command, "", 0, 0); 

    command = "record MyRec"; 
    mciSendString(command, "", 0, 0); 
} 

// Stop recording 
public void stoprec() 
{ 
    string fileName = @"""D:\Rec1.wav"""; 

    string command = "stop MyRec"; 
    mciSendString(command, "", 0, 0); 

    command = @"save MyRec " + fileName; 

    Debug.WriteLine(command); 
    mciSendString(command, "", 0, 0); 

    command = "close MyRec"; 
    mciSendString(command, "", 0, 0); 
} 

隨着3），I也希望使用mciSendString。我發現以下命令（狀態）：

string command = "status MyRec level "; 
long mci_ret = mciSendString(command, "", 0, 0); 

但我不知道從上面的命令獲取音量，任何人都可以告訴我的方式？

參考：從mciSendString狀態命令（）在微軟的文檔中發現： http://msdn.microsoft.com/en-us/library/windows/desktop/dd798683%28v=vs.85%29.aspx
它說： 級別：返回當前PCM音頻採樣值。

Answer 1

我通過打開兩個設備（一個用於錄製/播放（track1）和一個獲取關卡（waveLevel）來監視關卡。下面是在foxpro。

* OPEN WAVE DEVICE FOR LEVEL READINGS 
= mciSendString("open new type waveaudio alias waveLevel", '0&', 0, 0) 

* START RECORDING 
= mciSendString("open new type waveaudio alias track1", '0&', 0, 0) 

然後拿到TRACK1的水平我用的是waveLevel設備

= mciSendString("status waveLevel level", @cBuff, LEN(cBuff) ,0)