C#基于NAudio工具對Wav音頻檔案進行剪切，將一個音頻檔案剪切成多個音頻檔案
注：呼叫方法前需要匯入NAudio.dll或者在NuGet程式管理器搜索NAudio并安裝
本文是按時間剪切，直接擼代碼：
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工具對Wav音頻檔案剪切（限PCM格式） /// </summary> /// <param name="inPath">目標檔案</param> /// <param name="outPath">輸出檔案</param> /// <param name="cutFromStart">開始時間</param> /// <param name="cutFromEnd">結束時間</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; //判斷結束位置是否越界 endPos = endPos > fileLength ? fileLength : endPos; TrimWavFile(reader, writer, startPos, endPos); } } } /// <summary> /// 重新合并wav檔案 /// </summary> /// <param name="reader">讀取流</param> /// <param name="writer">寫入流</param> /// <param name="startPos">開始流</param> /// <param name="endPos">結束流</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); } } } } /// <summary> /// 基于NAudio工具對MP3音頻檔案剪切指定片段（補充） /// </summary> /// <param name="inputPath">目標檔案路徑</param> /// <param name="outputPath">輸出檔案路徑</param> /// <param name="begin">開始時間</param> /// <param name="end">結束時間</param> public static void TrimMp3File(string inputPath, string outputPath, TimeSpan? begin, TimeSpan? end) { if (begin.HasValue && end.HasValue && begin > end) throw new ArgumentOutOfRangeException("end", "end should be greater than begin"); using (var reader = new Mp3FileReader(inputPath)) using (var writer = File.Create(outputPath)) { Mp3Frame frame; while ((frame = reader.ReadNextFrame()) != null) if (reader.CurrentTime >= begin || !begin.HasValue) { if (reader.CurrentTime <= end || !end.HasValue) writer.Write(frame.RawData, 0, frame.RawData.Length); else break; } } } } }
呼叫：
string filePath = "D:\\wav\\test.wav";//需要切割的檔案路徑 int cutTimeSpan = 20;//切割的時間片段時間（秒） FileInfo fi = new FileInfo(filePath); //獲取錄音檔案時長（秒） int fileTime = (int)Util.Cover(Util.GetVoiceTime(filePath)) / 1000; //計算檔案需要切割多少等份 decimal fileNum = Math.Ceiling((decimal)fileTime / cutTimeSpan); int i = 0; while (i < fileNum) { string nowTime = Util.GetTimeStamp();//當前時間戳 //切割后保存的檔案絕對地址 var outputPath = System.IO.Path.Combine(fi.Directory.FullName, string.Format("{0}_{1}{2}", fi.Name.Replace(fi.Extension, ""), nowTime, fi.Extension)); //切割的開始時間 TimeSpan cutFromStart = TimeSpan.FromSeconds(i * cutTimeSpan); //切割的結束時間 TimeSpan cutFromEnd = cutFromStart + TimeSpan.FromSeconds(cutTimeSpan); //音頻切割 WavFileUtils.TrimWavFile(recordFile.FilePath, outputPath, cutFromStart, cutFromEnd); i++; }
Util 類：
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> /// 獲取時間戳 /// </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> /// 回傳音頻時長 /// </summary> /// <param name="SongPath">音頻檔案路徑</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;//回傳音頻時長 return SongTime; } /// <summary> /// 時間格式轉毫秒值 /// </summary> /// <param name="time">時間字串</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; } } }
效果圖：
參考：
https://github.com/naudio/NAudio
https://stackoverflow.com/questions/42170640/trim-a-wav-file
https://markheath.net/post/trimming-wav-file-using-naudio
總結：實踐是檢驗真理的唯一標準，
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標籤：C#