C# 使用ffmpeg.exe进行音频转换完整demo
今天在处理微信的开发接口时候，发现微信多媒体上传接口中返回的音频格式是amr。坑人的是现在大部分的web 播放器，不支持amr的格式播放。试了很多方法都不行。
没办法，只要找一个妥协的解决方案：将amr转换成mp3再进行播放。
于是，我在网上找了不少的音频转换方案，其中有DIrectshow和 ffmpeg。DIrectshow使用起来比较复杂，我就采用ffmpeg。通过调用ffmpeg.exe传递命令参数的方式，进行音频格式的转换。
该程序，主要是封装了调用ffmpeg.exe，并执行命令参数的功能。
核心代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace WavConvertAmr
{
public class WavConvertToAmr
{
/// <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[0];
try
{
pFileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader(pFileStream);
r.BaseStream.Seek(0, 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, 0, pReadByte.Length);
}
catch
{
return false;
}
finally
{
if (pFileStream != null)
pFileStream.Close();
}
return true;
}
}
}
调用代码：
private void button3_Click(object sender, EventArgs e)
{
OpenFileDialog open = new OpenFileDialog();
if (open.ShowDialog() == DialogResult.OK)
{
string fileName = open.FileName;
string targetFileName = "C:\\2222.mp3";
WavConvertAmr.WavConvertToAmr toamr = new WavConvertAmr.WavConvertToAmr();
toamr.ConvertToAmr(System.Windows.Forms.Application.StartupPath, fileName, targetFileName);
MessageBox.Show("转换成功");
}
}
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