public static int GetAudioDuration(String audioFileName)
{
MepgInfo mepgInfo = new MepgInfo();
GetMepgInfo(audioFileName, ref mepgInfo);
return(mepgInfo.Duration);
}
public static Boolean GetMepgInfo(String audioFileName, ref MepgInfo mepgInfo)
{
if (File.Exists(audioFileName))
{
FileStream mepgFileStream = null;
try
{
mepgFileStream = File.Open(audioFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
}
catch
{
return(false);
}
try
{
mepgInfo.FileSize = mepgFileStream.Length;
Byte[] headerBuffer = new Byte[32];
int byteRead = mepgFileStream.Read(headerBuffer, 0, 4);
if (byteRead == 4)
{
mepgInfo.FileIsMPEG = IsMepg(headerBuffer[0], headerBuffer[1], headerBuffer[2], headerBuffer[3]);
if (!mepgInfo.FileIsMPEG)
{
return(false);
}
mepgInfo.Layer = GetLayer(headerBuffer[1]);
mepgInfo.BitRate = GetBitRate(mepgInfo.Layer, headerBuffer[2]);
mepgInfo.SamplingFreq = GetSampleFreq(headerBuffer[1], headerBuffer[2]);
mepgInfo.FrameSize = GetFrameSize(mepgInfo.Layer, mepgInfo.BitRate, mepgInfo.SamplingFreq);
mepgInfo.Duration = GetDuration(mepgInfo.FileSize, mepgInfo.FrameSize, mepgInfo.SamplingFreq);
return(true);
}
else
{
return(false);
}
}
finally
{
mepgFileStream.Close();
}
}
else
{
return(false);
}
}