DirectSound:“值不在预期范围内”.初始化Notify时

本文关键字：范围内 初始化 Notify DirectSound | 更新日期: 2023-09-27 18:09:01

当我尝试运行一个简单的DirectSound程序时，我得到了这个异常。下面是代码:

using System;
using System.Runtime.InteropServices;
using System.Threading;
using Microsoft.DirectX.DirectSound;
namespace AudioDemo
{
    class Program
    {
        [DllImport("user32.dll")]
        private static extern IntPtr GetDesktopWindow();
        static void Main(string[] args)
        {
            // output device
            var device = new Device();
            device.SetCooperativeLevel(GetDesktopWindow(), CooperativeLevel.Normal);
            // format description
            var format = new WaveFormat
            {
                BitsPerSample = 8,
                Channels = 1,
                FormatTag = WaveFormatTag.Pcm,
                SamplesPerSecond = 8000
            };
            format.BlockAlign = (short)(format.BitsPerSample / 8 * format.Channels);
            format.AverageBytesPerSecond = format.SamplesPerSecond * format.BlockAlign;
            var outputLatency = 20;
            var frameSize = format.AverageBytesPerSecond * outputLatency / 1000;
            // buffer 
            var description = new BufferDescription
            {
                BufferBytes = frameSize,
                Format = format,
                DeferLocation = true,
                GlobalFocus = true
            };
            var outputBuffer = new SecondaryBuffer(description, device);
            // buffer notifications
            var notify = new Notify(outputBuffer);
            // ...
        }
    }
}

我在最后一行(var notify = new Notify(outputBuffer);)得到异常。

不知道哪里出错了。缓冲区初始化正确

DirectSound:“值不在预期范围内”.初始化Notify时

我不清楚你想用outputLatency和frameSize变量做什么，或者用BufferBytes属性，但我的猜测是你的问题在哪里。

"如果其BufferDescription.ControlPositionNotify设置为true，则SecondaryBuffer对象将仅支持通知事件。"

(https://msdn.microsoft.com/en-us/library/windows/desktop/ms812460.aspx)

那么试试这个:

        var description = new BufferDescription
        {
            BufferBytes = frameSize,
            Format = format,
            DeferLocation = true,
            GlobalFocus = true,
            ControlPositionNotify = true
        };

我遇到过同样的异常，但这解决了问题!

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