NAudio - ASIO 播放到设备(仅限静态)

Question

我正在尝试将ASIO音频路由到我的播放设备，但是，我听到的只是静态的。

ASIO 设置

BIT_PER_SAMPLE = 24

SAMPLE_RATE = 48000

目前，尝试将1个通道放入1个称为"Line 1"的播放设备进行测试。声音的播放是静态的。

编辑：下面的代码已更新。 它将需要 64 个通道的 ASIO 输入，并将它们一次路由到波形输出设备中(我正在使用虚拟音频电缆来创建它们(

private static AsioOut asioOut;
private static AsioInputPatcher inputPatcher;
private static readonly int BIT_PER_SAMPLE = 16;
private static readonly int SAMPLE_RATE = 48000;
private static readonly int NUMBER_OF_CHANNELS = 64;
private static BufferedWaveProvider[] bufferedWaveProviders = new BufferedWaveProvider[NUMBER_OF_CHANNELS];
private static WaveOut[] waveouts = new WaveOut[NUMBER_OF_CHANNELS];
[STAThread]
static void Main(string[] args)
{
InitDevices();
Record();
while (true)
{
Console.WriteLine("Recording...press any key to Exit.");
Console.ReadKey(true);
break;
}
asioOut.Stop();
asioOut.Dispose();
asioOut = null;
}
private static void Record()
{
inputPatcher = new AsioInputPatcher(SAMPLE_RATE, NUMBER_OF_CHANNELS, NUMBER_OF_CHANNELS);
asioOut = new AsioOut(AsioOut.GetDriverNames()[0]);
asioOut.InitRecordAndPlayback(new SampleToWaveProvider(inputPatcher),
NUMBER_OF_CHANNELS, 0);
asioOut.AudioAvailable += OnAsioOutAudioAvailable;
asioOut.Play();
}
private static void InitDevices()
{
for (int n = -1; n < WaveOut.DeviceCount; n++)
{
WaveOutCapabilities caps = WaveOut.GetCapabilities(n);
if (caps.ProductName.StartsWith("Line"))
{
int _number = int.Parse(caps.ProductName.Split(' ')[1]);
if (_number <= NUMBER_OF_CHANNELS)
{
waveouts[_number - 1] = new WaveOut() { DeviceNumber = n };
bufferedWaveProviders[_number - 1] = new BufferedWaveProvider(new WaveFormat(SAMPLE_RATE, BIT_PER_SAMPLE, 2));
waveouts[_number - 1].Init(bufferedWaveProviders[_number - 1]);
waveouts[_number - 1].Play();
}
}
}
}
static void OnAsioOutAudioAvailable(object sender, AsioAudioAvailableEventArgs e)
{
inputPatcher.ProcessBuffer(e.InputBuffers, e.OutputBuffers,
e.SamplesPerBuffer, e.AsioSampleType);
for (int outputChannel = 0; outputChannel < e.OutputBuffers.Length; outputChannel++)
{
byte[] buf = new byte[e.SamplesPerBuffer * (BIT_PER_SAMPLE / 8)];
Marshal.Copy(e.OutputBuffers[outputChannel], buf, 0, e.SamplesPerBuffer * (BIT_PER_SAMPLE / 8));
bufferedWaveProviders[outputChannel].AddSamples(buf, 0, buf.Length);
}
e.WrittenToOutputBuffers = true;
}

Answer 1

您的代码有两个主要问题。首先，InputBuffers是每个通道一个，而不是采样。其次，当你设定e.WrittenToOutputBuffers = true时，你是在说你已经写信给e.OutputBuffers而你没有。因此，它们将只包含未初始化的数据。

如果您想查看 ASIO 缓冲区的低级操作示例，请查看我的 ASIO 跳线架示例项目。