处理“动态”音频（C＃，WP7）

有没有办法，在C＃中，在.NET上，“在运行中”处理音频？ 例如，如果我想在录制时评估音频AT的平均强度（为此，我将需要最后几毫秒）。

Answer 1

麦克风的初始化和录制的声音处理：

private void Initialize() { Microphone microphone = Microphone.Default; // 100 ms is a minimum buffer duration microphone.BufferDuration = TimeSpan.FromMilliseconds(100); DispatcherTimer updateTimer = new DispatcherTimer() { Interval = TimeSpan.FromMilliseconds(0.1) }; updateTimer.Tick += (s, e) => { FrameworkDispatcher.Update(); }; updateTimer.Start(); byte[] microphoneSignal = new byte[microphone.GetSampleSizeInBytes(microphone.BufferDuration)]; microphone.BufferReady += (s, e) => { int microphoneDataSize = microphone.GetData(microphoneSignal); double amplitude = GetSignalAmplitude(microphoneSignal); // do your stuff with amplitude here }; microphone.Start(); } 

整体信号的幅度。 您可以找到不在所有字节数组中的平均值，但在较小的窗口中可以获得幅度曲线：

 private double GetSignalAmplitude(byte[] signal) { int BytesInSample = 2; int signalSize = signal.Length / BytesInSample; double Sum = 0.0; for (int i = 0; i < signalSize; i++) { int sample = Math.Abs(BitConverter.ToInt16(signal, i * BytesInSample)); Sum += sample; } double amplitude = Sum / signalSize; return amplitude; } 

其他用于生成声音的东西可能会帮助您将来：

 DynamicSoundEffectInstance generatedSound = new DynamicSoundEffectInstance(SampleRate, AudioChannels.Mono); generatedSound.SubmitBuffer(buffer); private void Int16ToTwoBytes(byte[] output, Int16 value, int offset) { output[offset + 1] = (byte)(value >> 8); output[offset] = (byte)(value & 0x00FF); }