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