AudioHelper.cs
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using NAudio.Wave;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
/// <summary>
/// audio processing
/// Copyright (c) 2023 by manyeyes
/// </summary>
public class AudioHelper
{
public static float[] GetFileSamples(string wavFilePath, ref TimeSpan duration)
{
if (!File.Exists(wavFilePath))
{
Trace.Assert(File.Exists(wavFilePath), "file does not exist:" + wavFilePath);
return new float[1];
}
AudioFileReader _audioFileReader = new AudioFileReader(wavFilePath);
byte[] datas = new byte[_audioFileReader.Length];
_audioFileReader.Read(datas, 0, datas.Length);
duration = _audioFileReader.TotalTime;
float[] wavdata = new float[datas.Length / sizeof(float)];
Buffer.BlockCopy(datas, 0, wavdata, 0, datas.Length);
return wavdata;
}
public static List<float[]> GetChunkSamplesList(string wavFilePath, ref TimeSpan duration)
{
List<float[]> wavdatas = new List<float[]>();
if (!File.Exists(wavFilePath))
{
Trace.Assert(File.Exists(wavFilePath), "file does not exist:" + wavFilePath);
wavdatas.Add(new float[1]);
return wavdatas;
}
AudioFileReader _audioFileReader = new AudioFileReader(wavFilePath);
byte[] datas = new byte[_audioFileReader.Length];
int chunkSize = 16000;// datas.Length / sizeof(float);
int chunkNum = (int)Math.Ceiling((double)datas.Length / chunkSize);
for (int i = 0; i < chunkNum; i++)
{
int offset = 0;
int dataCount = 0;
if (Math.Abs(datas.Length - i * chunkSize) > chunkSize)
{
offset = i * chunkSize;
dataCount = chunkSize;
}
else
{
offset = i * chunkSize;
dataCount = datas.Length - i * chunkSize;
}
_audioFileReader.Read(datas, offset, dataCount);
duration += _audioFileReader.TotalTime;
float[] wavdata = new float[chunkSize / sizeof(float)];
Buffer.BlockCopy(datas, offset, wavdata, 0, dataCount);
wavdatas.Add(wavdata);
}
return wavdatas;
}
}