C#基于NAudio怎么实现对Wav音频文件剪切

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前言

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

实现代码

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    {        /// 
        /// 基于NAudio工具对Wav音频文件剪切（限PCM格式）        /// 
        /// 目标文件        /// 输出文件        /// 开始时间        /// 结束时间        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);                }            }        }        /// 
        /// 重新合并wav文件        /// 
        /// 读取流        /// 写入流        /// 开始流        /// 结束流        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    {        /// 
        /// 获取时间戳        /// 
        ///         public static string GetTimeStamp()        {            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);            return Convert.ToInt64(ts.TotalMilliseconds).ToString();        }        /// 
        /// 返回音频时长        /// 
        /// 音频文件路径        ///         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;        }　　　   /// 
        /// 时间格式转毫秒值        /// 
        /// 时间字符串        ///         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;        }    }}

效果图

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