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|
// This method allows calculate file bitrate :
public static double CalculateBitRate(string _sFileName)
{
//Create FTP request
FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(ReturnURI(_sFileName));
reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
reqFTP.Credentials = new NetworkCredential(StreamMediaInfo.sFTPServerUser, StreamMediaInfo.FTPServerPassword);
reqFTP.UseBinary = true;
reqFTP.UsePassive = false;
reqFTP.KeepAlive = true;
int _iBufferSize = (int)reqFTP.GetResponse().ContentLength;
//Now get the actual data
reqFTP = (FtpWebRequest)FtpWebRequest.Create(ReturnURI(_sFileName));
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.Credentials = new NetworkCredential(StreamMediaInfo.sFTPServerUser, StreamMediaInfo.FTPServerPassword);
reqFTP.UseBinary = true;
reqFTP.UsePassive = false;
reqFTP.KeepAlive = false;
//Stream
FtpWebResponse _FtpWebResponse = (FtpWebResponse)reqFTP.GetResponse();
Stream reader = _FtpWebResponse.GetResponseStream();
MemoryStream memStream = new MemoryStream();
// Calculate Bitrate
byte[] acPacket = new byte[Constants.TS_PACKET_SIZE];
int nPID = 0;
int nBytesRead = 0;
int nPCRExtension1 = 0;
int nPCRExtension2 = 0;
int nPCRPID = 0;
ulong nNumPackets = 0;
ulong nLength = 0;
ulong nIndex = 0;
ulong nNum = 0;
ulong nDen = 0;
double dBitRateVideo = -1;
ulong nPCR1 = 0;
ulong nPCR2 = 0;
ulong nPCR1D = 0;
ulong nPCR2D = 0;
ulong nPacket1 = 0;
ulong nPacket2 = 0;
long nPCRBase1 = 0;
long nPCRBase2 = 0;
bool bPCRCalculation = false;
byte[] buffer = new byte[Constants.TS_PACKET_SIZE];
nLength = (ulong)_iBufferSize;
nNumPackets =nLength / Constants.TS_PACKET_SIZE;
nPCRPID = StreamMediaInfo.CalculatePCRPID(_sFileName);
if (nPCRPID < 0)
{
return -1;
}
int i = 0;
while (true)
{
//Try to read the data
int bytesRead = reader.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
{
break;
}
else if(bytesRead==188)
{
if (nIndex < nNumPackets)
{
//Write the downloaded data
memStream.Write(buffer, 0, bytesRead);
memStream.Seek(0, SeekOrigin.Begin);
acPacket = memStream.ToArray();
nBytesRead = acPacket.Length;
if (nBytesRead != Constants.TS_PACKET_SIZE)
{
//STR_INVALID_PCR_PID_ERROR
reader.Close();
memStream.Close();
_FtpWebResponse.Close();
}
nPID = 0xFF & acPacket[2];
nPID = nPID | ((acPacket[1] & 0x1F) << 8);
// dBitRateVideo = nPID;
if (nPID == nPCRPID)
{
if (((acPacket[3] & 0x30) == 0x20) || ((acPacket[3] & 0x30) == 0x30))
{
//It has adaption field
if (acPacket[4] != 0x00)
{
//adaption_field_length != 0
if ((acPacket[5] & 0x10) == 0x10)
{
//PCR_flag = 1
if (bPCRCalculation == false)
{
nPCRBase1 = 0;
nPCRBase1 = nPCRBase1 | (0xFF & acPacket[9]);
nPCRBase1 = nPCRBase1 | ((0xFF & acPacket[8]) << 8);
nPCRBase1 = nPCRBase1 | ((0xFF & acPacket[7]) << 16);
nPCRBase1 = nPCRBase1 | (0xFF000000 & ((0xFF & acPacket[6]) << 24));
nPCRBase1 = nPCRBase1 << 1;
nPCRBase1 = nPCRBase1 | ((acPacket[10] >> 7) & 0x01);
bPCRCalculation = true;
nPacket1 = nIndex;
nPCRExtension1 = 0;
nPCRExtension1 = nPCRExtension1 | (0xFF & acPacket[11]);
nPCRExtension1 = nPCRExtension1 | ((0x01 & acPacket[10]) << 8);
nPCR1 = (ulong)(nPCRBase1 * Constants.TIME_UNIT_BASE_PCR + nPCRExtension1 * Constants.TIME_UNIT_EXT_PCR);
nPCR1D = (ulong)(nPCRBase1 * 300 + nPCRExtension1);
}
else
{
nPCRBase2 = 0;
nPCRBase2 = nPCRBase2 | (0xFF & acPacket[9]);
nPCRBase2 = nPCRBase2 | ((0xFF & acPacket[8]) << 8);
nPCRBase2 = nPCRBase2 | ((0xFF & acPacket[7]) << 16);
nPCRBase2 = nPCRBase2 | (0xFF000000 & ((0xFF & acPacket[6]) << 24));
nPCRBase2 = nPCRBase2 << 1;
nPCRBase2 = nPCRBase2 | ((acPacket[10] >> 7) & 0x01);
nPacket2 = nIndex;
nPCRExtension2 = 0;
nPCRExtension2 = nPCRExtension2 | (0xFF & acPacket[11]);
nPCRExtension2 = nPCRExtension2 | ((0x01 & acPacket[10]) << 8);
nPCR2 = (ulong)(nPCRBase2 * Constants.TIME_UNIT_BASE_PCR + nPCRExtension2 * Constants.TIME_UNIT_EXT_PCR);
nPCR2D = (ulong)(nPCRBase2 * 300 + nPCRExtension2);
nNum = (nPacket2 - nPacket1) * Constants.TS_PACKET_SIZE * 8;
nDen = nPCR2 - nPCR1;
if (nDen < 100)
{
//dBitRateVideo = (double)(nNum / nDen);
nDen = nPCR2D - nPCR1D;
dBitRateVideo = ((double)nNum / (double)nDen) * Constants.SYSTEM_CLOCK_FREQUENCY;
continue;
}
break;
}
}
}
}
}
}
}
else if (bytesRead < 188)
{
i++;
}
nIndex++;
}
reader.Close();
memStream.Close();
_FtpWebResponse.Close();
return dBitRateVideo;
}
// This method allows calculate video duration
public static double CalculateVideoDurationS(string _sFileName)
{
//Create FTP request
FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(ReturnURI(_sFileName));
reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
reqFTP.Credentials = new NetworkCredential(StreamMediaInfo.sFTPServerUser, StreamMediaInfo.FTPServerPassword);
reqFTP.UseBinary = true;
reqFTP.UsePassive = false;
reqFTP.KeepAlive = true;
int _iBufferSize = (int)reqFTP.GetResponse().ContentLength;
// Calculate VideoDuration
ulong dLength = 0;
double dDuration = -1;
dLength = (ulong)_iBufferSize;
double _dBitrate = StreamMediaInfo.CalculateBitRate(_sFileName);
if (_dBitrate == -1)
{
return -1;
}
dDuration = dLength * 8 / _dBitrate;
return dDuration;
} |
Calculer le Bitrate d'un video (format .TS) stocké dans un serveur FTP
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