Wav音频文件剪切指定片段（限PCM格式）

  /// <summary>
        /// 读取wav文件然后剪切
        /// </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  void TrimWavFile(string inPath, string outPath, TimeSpan cutFromStart, TimeSpan cutFromEnd)
        {
            using (WaveFileReader reader = new WaveFileReader(inPath))
            {
                using (WaveFileWriter writer = new WaveFileWriter(outPath, reader.WaveFormat))
                {
                    int bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000;

                    int startPos = (int)cutFromStart.TotalMilliseconds * bytesPerMillisecond;
                    startPos = startPos - startPos % reader.WaveFormat.BlockAlign;

                    int endBytes = (int)cutFromEnd.TotalMilliseconds * bytesPerMillisecond;
                    endBytes = endBytes - endBytes % reader.WaveFormat.BlockAlign;
                    //int endPos = (int)reader.Length - endBytes;

                    TrimWavFile(reader, writer, startPos, endBytes);
                }
            }
        }

        /// <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.WriteData(buffer, 0, bytesRead);
                    }
                }
            }
        }

导入NAudio.dll 

下载https://download.csdn.net/download/qq_33670936/10548691