.net 使用ffmpeg.exe进行音频转码

        #region 音频转换
private int AudioIntervalTime = 100, iAudio = 0;
private string strPath = "D:\\web\\XXXX\\voice\\";
/// <summary>
/// 线程委托
/// </summary>
private delegate void DelegateAudio();
/// <summary>
/// 定时器
/// </summary>
System.Threading.Timer timeAudio;
/// <summary>
/// 定义线程
/// </summary>
private void TimeThreadAudio()
{
Thread thread = new Thread(ThreadAudio);
thread.Name = "Audio";
thread.IsBackground = true;
thread.Start();
}
/// <summary>
/// 线程委托
/// </summary>
private void ThreadAudio()
{
DelegateAudio dp = new DelegateAudio(ThreadAudioFunction);
dp.BeginInvoke(null, null);
}
/// <summary>
/// 线程定时调整
/// </summary>
private void ThreadAudioFunction()
{
timeAudio = new System.Threading.Timer(new System.Threading.TimerCallback(AudioFunction), null, 0, 0);
}
/// <summary>
/// 线程工作方法体
/// </summary>
/// <param name="sender"></param>
private void AudioFunction(object sender)
{
timeAudio.Change(System.Threading.Timeout.Infinite, System.Threading.Timeout.Infinite);
try
{
Dictionary<string, string> list = new RedisTool().GetAllEntriesFromHash(SysConst.str_H_Rd_AudioConvert);
foreach (var item in list)
{
string fileName = strPath + item.Key;
string targetFileName = strPath + item.Key.Replace("amr","mp3"); ;
WavConvertToAmrHelp toamr = new WavConvertToAmrHelp();
toamr.ConvertToAmr(System.Windows.Forms.Application.StartupPath, fileName, targetFileName);
ShowContent(string.Format("当前时间:{0};音频文件:{1};转换成功;\r\n", DateTime.Now.ToString(), item.Key), rtbAudioContent, iAudio++);
new RedisTool().RemoveEntryFromHash(SysConst.str_H_Rd_AudioConvert, item.Key);
}
}
catch (Exception ex)
{
LogHelper.Save(ex);
ShowContent(DateTime.Now.ToString() + "\r\n" + ex.ToString() + "\r\n", rtbAudioContent, iAudio);
}
timeAudio.Change(AudioIntervalTime, AudioIntervalTime);
}
#endregion

  

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text; namespace SZ.Company.Common
{
/// <summary>
/// 音频转换工具类
/// </summary>
public class WavConvertToAmrHelp
{
/// <summary>
/// 将Wav音频转成Amr手机音频
/// </summary>
/// <param name="applicationPath">ffmeg.exe文件路径</param>
/// <param name="fileName">WAV文件的路径(带文件名)</param>
/// <param name="targetFilName">生成目前amr文件路径(带文件名)</param>
public void ConvertToAmr(string applicationPath, string fileName, string targetFilName)
{
string c = applicationPath + @"\ffmpeg.exe -y -i " + fileName + " -ar 8000 -ab 12.2k -ac 1 " + targetFilName;
Cmd(c);
} /// <summary>
/// 执行Cmd命令
/// </summary>
private void Cmd(string c)
{
try
{
System.Diagnostics.Process process = new System.Diagnostics.Process();
process.StartInfo.FileName = "cmd.exe";
process.StartInfo.UseShellExecute = false;
process.StartInfo.CreateNoWindow = true;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.RedirectStandardInput = true;
process.Start(); process.StandardInput.WriteLine(c);
process.StandardInput.AutoFlush = true;
process.StandardInput.WriteLine("exit"); StreamReader reader = process.StandardOutput;//截取输出流 process.WaitForExit();
}
catch
{ }
} /// <summary>
/// 获取文件的byte[]
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public byte[] GetFileByte(string fileName)
{
FileStream pFileStream = null;
byte[] pReadByte = new byte[];
try
{
pFileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader(pFileStream);
r.BaseStream.Seek(, SeekOrigin.Begin); //将文件指针设置到文件开
pReadByte = r.ReadBytes((int)r.BaseStream.Length);
return pReadByte;
}
catch
{
return pReadByte;
}
finally
{
if (pFileStream != null)
pFileStream.Close();
}
} /// <summary>
/// 将文件的byte[]生成文件
/// </summary>
/// <param name="pReadByte"></param>
/// <param name="fileName"></param>
/// <returns></returns>
public bool writeFile(byte[] pReadByte, string fileName)
{
FileStream pFileStream = null;
try
{
pFileStream = new FileStream(fileName, FileMode.OpenOrCreate);
pFileStream.Write(pReadByte, , pReadByte.Length);
}
catch
{
return false;
}
finally
{
if (pFileStream != null)
pFileStream.Close();
}
return true; }
}
}
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