我正在使用 NAudio 库,并希望对 WaveStream 执行快速傅立叶变换。我看到 NAudio 已经内置了 FFT 但我该如何使用它呢?
我听说我必须使用 SampleAggregator 类。
您需要阅读整篇博客文章,以最好地理解我提取的以下代码示例,以确保即使文章没有保留该示例:
using (WaveFileReader reader = new WaveFileReader(fileToProcess))
{
IWaveProvider stream32 = new Wave16toFloatProvider(reader);
IWaveProvider streamEffect = new AutoTuneWaveProvider(stream32, autotuneSettings);
IWaveProvider stream16 = new WaveFloatTo16Provider(streamEffect);
using (WaveFileWriter converted = new WaveFileWriter(tempFile, stream16.WaveFormat))
{
// buffer length needs to be a power of 2 for FFT to work nicely
// however, make the buffer too long and pitches aren't detected fast enough
// successful buffer sizes: 8192, 4096, 2048, 1024
// (some pitch detection algorithms need at least 2048)
byte[] buffer = new byte[8192];
int bytesRead;
do
{
bytesRead = stream16.Read(buffer, 0, buffer.Length);
converted.WriteData(buffer, 0, bytesRead);
} while (bytesRead != 0 && converted.Length < reader.Length);
}
}
但简而言之,如果您创建了 WAV 文件,您可以使用该示例将其转换为 FFT。