c# - 使用 SlimDX 和 DirectSound (C#) 播放声音

Question

(抱歉，如果这是重复的......我发布了但没有看到它确实进入论坛的证据)

我一直在努力让 SlimDX DirectSound 正常工作。这是我的代码。它从 wav 文件填充辅助缓冲区，然后在线程循环中交替填充缓冲区的下半部分或上半部分。

它很好地播放了缓冲区的第一次加载。 AutoResetEvents 在它们应该触发的时候触发，然后填充缓冲区的下半部分和上半部分(使用调试语句验证)。但是在第一次加载缓冲区后播放不会继续。因此，缓冲区的重新填充以某种方式无法正常工作。

想法？

(我正在使用 DirectSound，因为这是我发现的设置我想使用的音频设备 GUID 的唯一方法。我对其他 .NET 友好的方法持开放态度。)

private void PlaySound(Guid soundCardGuid, string audioFile) {
        DirectSound ds = new DirectSound(soundCardGuid);

        ds.SetCooperativeLevel(this.Handle, CooperativeLevel.Priority);

        WaveFormat format = new WaveFormat();
        format.BitsPerSample = 16;
        format.BlockAlignment = 4;
        format.Channels = 2;
        format.FormatTag = WaveFormatTag.Pcm;
        format.SamplesPerSecond = 44100;
        format.AverageBytesPerSecond = format.SamplesPerSecond * format.BlockAlignment;

        SoundBufferDescription desc = new SoundBufferDescription();
        desc.Format = format;
        desc.Flags = BufferFlags.GlobalFocus;
        desc.SizeInBytes = 8 * format.AverageBytesPerSecond; 

        PrimarySoundBuffer pBuffer = new PrimarySoundBuffer(ds, desc);

        SoundBufferDescription desc2 = new SoundBufferDescription();
        desc2.Format = format;
        desc2.Flags = BufferFlags.GlobalFocus | BufferFlags.ControlPositionNotify | BufferFlags.GetCurrentPosition2;
        desc2.SizeInBytes = 8 * format.AverageBytesPerSecond;

        SecondarySoundBuffer sBuffer1 = new SecondarySoundBuffer(ds, desc2);

        NotificationPosition[] notifications = new NotificationPosition[2];
        notifications[0].Offset = desc2.SizeInBytes / 2 + 1;
        notifications[1].Offset = desc2.SizeInBytes - 1; ;

        notifications[0].Event = new AutoResetEvent(false);
        notifications[1].Event = new AutoResetEvent(false);
        sBuffer1.SetNotificationPositions(notifications);

        byte[] bytes1 = new byte[desc2.SizeInBytes / 2];
        byte[] bytes2 = new byte[desc2.SizeInBytes];

        Stream stream = File.Open(audioFile, FileMode.Open);

        Thread fillBuffer = new Thread(() => {
            int readNumber = 1;
            int bytesRead;

            bytesRead = stream.Read(bytes2, 0, desc2.SizeInBytes);
            sBuffer1.Write<byte>(bytes2, 0, LockFlags.None);
            sBuffer1.Play(0, PlayFlags.None); 
            while (true) {
                if (bytesRead == 0) { break; }
                notifications[0].Event.WaitOne();
                bytesRead = stream.Read(bytes1, 0, bytes1.Length);
                sBuffer1.Write<byte>(bytes1, 0, LockFlags.None);

                if (bytesRead == 0) { break; }
                notifications[1].Event.WaitOne();
                bytesRead = stream.Read(bytes1, 0, bytes1.Length);
                sBuffer1.Write<byte>(bytes1, desc2.SizeInBytes / 2, LockFlags.None); 
            }
            stream.Close();
            stream.Dispose();
        });
        fillBuffer.Start();
    }
}

Answer 1

您还没有将其设置为在播放缓冲区上循环播放。将您的代码更改为:

sBuffer1.Play(0, PlayFlags.Looping);