C# 使用微软aec回音消除

以下是一个使用C#实现微软AEC（回音消除）的示例代码：

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;

class AEC
{
    [DllImport("ms_aec.dll", CallingConvention = CallingConvention.Cdecl)]
    private static extern int Initialize(int sampleRate, int numChannels);

    [DllImport("ms_aec.dll", CallingConvention = CallingConvention.Cdecl)]
    private static extern int Process(IntPtr inputBuffer, int numSamples, IntPtr outputBuffer);

    [DllImport("ms_aec.dll", CallingConvention = CallingConvention.Cdecl)]
    private static extern int Terminate();

    static void Main(string[] args)
    {
        // 初始化AEC
        int sampleRate = 16000;
        int numChannels = 1;
        int result = Initialize(sampleRate, numChannels);
        if (result != 0)
        {
            Console.WriteLine("Failed to initialize AEC");
            return;
        }

        // 读取音频文件
        string inputFile = "input.wav";
        byte[] audioData = File.ReadAllBytes(inputFile);

        // 转换为16位有符号整数数组
        short[] inputBuffer = new short[audioData.Length / 2];
        Buffer.BlockCopy(audioData, 0, inputBuffer, 0, audioData.Length);

        // 处理音频数据
        int numSamples = inputBuffer.Length;
        short[] outputBuffer = new short[numSamples];
        GCHandle inputHandle = GCHandle.Alloc(inputBuffer, GCHandleType.Pinned);
        GCHandle outputHandle = GCHandle.Alloc(outputBuffer, GCHandleType.Pinned);
        IntPtr inputPtr = inputHandle.AddrOfPinnedObject();
        IntPtr outputPtr = outputHandle.AddrOfPinnedObject();
        result = Process(inputPtr, numSamples, outputPtr);
        if (result != 0)
        {
            Console.WriteLine("Failed to process audio with AEC");
            return;
        }

        // 保存处理后的音频文件
        byte[] outputData = new byte[numSamples * 2];
        Buffer.BlockCopy(outputBuffer, 0, outputData, 0, outputData.Length);
        string outputFile = "output.wav";
        File.WriteAllBytes(outputFile, outputData);

        // 终止AEC
        result = Terminate();
        if (result != 0)
        {
            Console.WriteLine("Failed to terminate AEC");
            return;
        }

        Console.WriteLine("AEC processing completed successfully");
    }
}

请确保将 `ms_aec.dll` 文件放在与代码相同的目录下。另外，您还需要将输入音频文件 `input.wav` 替换为您自己的音频文件路径。

这段代码通过调用微软的AEC DLL来实现回声消除。它使用C#的P/Invoke功能与非托管的C++代码进行交互。在运行代码之前，请确保已正确安装所需的依赖项，