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：
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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：
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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"); } } |
示例下载：
链接：http://pan.baidu.com/s/1jGxa4M6 密码：bnqw