How to cut Wav Audio File based on NAudio

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Preface

C# cuts Wav audio files based on NAudio tools, cutting one audio file into multiple audio files

Note: before calling the method, you need to import NAudio.dll or search the NuGet program manager for NAudio and install it.

This article is cut by time.

Implementation code 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 {/ cut Wav audio files based on NAudio tool (PCM format only) / object file / output file / start time / end time 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; / / determine whether the end position is out of bounds endPos = endPos > fileLength? FileLength: endPos; TrimWavFile (reader, writer, startPos, endPos) } / remerge wav files / read stream / / write stream / / start stream / end stream 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) }}}

Call:

String filePath = "D:\\ wav\\ test.wav"; / / the path to the file to be cut int cutTimeSpan = 20ram / the time segment time to be cut (seconds) FileInfo fi = new FileInfo (filePath); / / the length of time to get the recording file (seconds) int fileTime = (int) Util.Cover (Util.GetVoiceTime (filePath)) / 1000X hand / calculate the number of equal pieces of the file to be cut decimal fileNum = Math.Ceiling ((decimal) fileTime / cutTimeSpan); int I = 0 While (I < fileNum) {string nowTime = Util.GetTimeStamp (); / / current timestamp / / absolute address of files saved after cutting var outputPath = System.IO.Path.Combine (fi.Directory.FullName, string.Format ("{0} _ {1} {2}", fi.Name.Replace (fi.Extension, "), nowTime, fi.Extension); / / start time of cutting TimeSpan cutFromStart = TimeSpan.FromSeconds (I * cutTimeSpan) / / end time of cutting TimeSpan cutFromEnd = cutFromStart + TimeSpan.FromSeconds (cutTimeSpan); / / Audio cutting WavFileUtils.TrimWavFile (recordFile.FilePath, outputPath, cutFromStart, cutFromEnd); iTunes;}

Util class:

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 {/ public static string GetTimeStamp () {TimeSpan ts = DateTime.UtcNow-new DateTime (1970, 1, 1, 0, 0, 0, 0); return Convert.ToInt64 (ts.TotalMilliseconds). ToString () } / return audio duration / public static string GetVoiceTime file path / 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;// returns audio duration return SongTime } / time format to millisecond value / 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;} effect

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