这篇文章主要讲解了“C#基于NAudio怎么实现对Wav音频文件剪切”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“C#基于NAudio怎么实现对Wav音频文件剪切”吧！
C#基于NAudio工具对Wav音频文件进行剪切，将一个音频文件剪切成多个音频文件
注：调用方法前需要导入NAudio.dll或者在NuGet程序管理器搜索NAudio并安装
本文是按时间剪切
计算
安全
数据库
网络和加速
企业服务
using NAudio.Wave;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace XXX.util
{
public static class WavFileUtils
{
/// <summary>
/// 基于NAudio工具对Wav音频文件剪切（限PCM格式）
/// </summary>
/// <param name="inPath">目标文件</param>
/// <param name="outPath">输出文件</param>
/// <param name="cutFromStart">开始时间</param>
/// <param name="cutFromEnd">结束时间</param>
public static void TrimWavFile(string inPath, string outPath, TimeSpan cutFromStart, TimeSpan cutFromEnd)
{
using (WaveFileReader reader = new WaveFileReader(inPath))
{
int fileLength = (int)reader.Length;using (WaveFileWriter writer = new WaveFileWriter(outPath, reader.WaveFormat))
{
float bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000f;
int startPos = (int)Math.Round(cutFromStart.TotalMilliseconds * bytesPerMillisecond);
startPos = startPos - startPos % reader.WaveFormat.BlockAlign;
int endPos = (int)Math.Round(cutFromEnd.TotalMilliseconds * bytesPerMillisecond);
endPos = endPos - endPos % reader.WaveFormat.BlockAlign;
//判断结束位置是否越界
endPos = endPos > fileLength ? fileLength : endPos;
TrimWavFile(reader, writer, startPos, endPos);
}
}
}
/// <summary>
/// 重新合并wav文件
/// </summary>
/// <param name="reader">读取流</param>
/// <param name="writer">写入流</param>
/// <param name="startPos">开始流</param>
/// <param name="endPos">结束流</param>
private static void TrimWavFile(WaveFileReader reader, WaveFileWriter writer, int startPos, int endPos)
{
reader.Position = startPos;
byte[] buffer = new byte[1024];
while (reader.Position < endPos)
{
int bytesRequired = (int)(endPos - reader.Position);
if (bytesRequired > 0)
{
int bytesToRead = Math.Min(bytesRequired, buffer.Length);
int bytesRead = reader.Read(buffer, 0, bytesToRead);
if (bytesRead > 0)
{
writer.Write(buffer, 0, bytesRead);
}
}
}
}
}
}调用：
string filePath = "D:\\wav\\test.wav";//需要切割的文件路径
int cutTimeSpan = 20;//切割的时间片段时间（秒）
FileInfo fi = new FileInfo(filePath);
//获取录音文件时长（秒）
int fileTime = (int)Util.Cover(Util.GetVoiceTime(filePath)) / 1000;
//计算文件需要切割多少等份
decimal fileNum = Math.Ceiling((decimal)fileTime / cutTimeSpan);
int i = 0;
while (i < fileNum)
{
string nowTime = Util.GetTimeStamp();//当前时间戳
//切割后保存的文件绝对地址
var outputPath = System.IO.Path.Combine(fi.Directory.FullName, string.Format("{0}_{1}{2}", fi.Name.Replace(fi.Extension, ""), nowTime, fi.Extension));
//切割的开始时间
TimeSpan cutFromStart = TimeSpan.FromSeconds(i * cutTimeSpan);
//切割的结束时间
TimeSpan cutFromEnd = cutFromStart + TimeSpan.FromSeconds(cutTimeSpan);
//音频切割
WavFileUtils.TrimWavFile(recordFile.FilePath, outputPath, cutFromStart, cutFromEnd);
i++;
}Util 类：
using Shell32;
using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text.RegularExpressions;
using System.Threading;
using System.Windows.Forms;
namespace XXX.util
{
class Util
{
/// <summary>
/// 获取时间戳
/// </summary>
/// <returns></returns>
public static string GetTimeStamp()
{
TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
return Convert.ToInt64(ts.TotalMilliseconds).ToString();
}
/// <summary>
/// 返回音频时长
/// </summary>
/// <param name="SongPath">音频文件路径</param>
/// <returns></returns>
public static string GetVoiceTime(string SongPath)
{
string dirName = Path.GetDirectoryName(SongPath);
string SongName = Path.GetFileName(SongPath);
ShellClass sh = new ShellClass();
Folder dir = sh.NameSpace(dirName);
FolderItem item = dir.ParseName(SongName);
string SongTime = Regex.Match(dir.GetDetailsOf(item, -1), "\\d:\\d{2}:\\d{2}").Value;//返回音频时长
return SongTime;
}
/// <summary>
/// 时间格式转毫秒值
/// </summary>
/// <param name="time">时间字符串</param>
/// <returns></returns>
public static long Cover(string time)
{
string[] a = time.Split(':');
if (long.Parse(a[0]) == 0 && long.Parse(a[1]) == 0)
{
return long.Parse(a[2]) * 1000;
}
else if (long.Parse(a[0]) == 0 && long.Parse(a[1]) != 0)
{
return (long.Parse(a[1]) * 60 + long.Parse(a[2])) * 1000;
}
else if (long.Parse(a[0]) != 0 && long.Parse(a[1]) == 0)
{
return ((long.Parse(a[0]) * 60 * 60) + long.Parse(a[2])) * 1000;
}
else if (long.Parse(a[0]) != 0 && long.Parse(a[1]) != 0)
{
return (((long.Parse(a[0]) * 60) + long.Parse(a[1])) * 60) * 1000;
}
return 0;
}
}
}
感谢各位的阅读，以上就是“C#基于NAudio怎么实现对Wav音频文件剪切”的内容了，经过本文的学习后，相信大家对C#基于NAudio怎么实现对Wav音频文件剪切这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是亿速云，小编将为大家推送更多相关知识点的文章，欢迎关注！
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