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:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
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:
1
2
3
4
5
6
7
8
9
10
11
12
|
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