public override int Read(byte[] buffer, int offset, int count)
{
int bytesRead = 0;
long internalBufferPos;
if (_readBuffer.Length - _readBuffer.Position >= count)
{
return _readBuffer.Read(buffer, offset, count);
}
byte[] packetBuffer = new byte[_asfConfig.AsfPacketSize];
internalBufferPos = _readBuffer.Position;
_readBuffer.Seek(0, SeekOrigin.End);
while (_readBuffer.Length - internalBufferPos < count)
{
//fill buffer
if (!_isHeaderStreamed && StreamType != AsfStreamType.asfUnaltered)
{
byte[] headerData = _asfFile.GetStreamingHeader();
_readBuffer.Write(headerData, 0, headerData.Length);
_isHeaderStreamed = true;
}
else
{
bytesRead = _asfFile.Read(packetBuffer, 0, (int)_asfConfig.AsfPacketSize);
if (bytesRead == _asfConfig.AsfPacketSize)
{
AsfPacket currentPacket = new AsfPacket(_asfConfig, packetBuffer);
if (_isFirstPacket)
{
_streamInfo.ResetMediaObjects();
_streamInfo.StartSendTime = currentPacket.SendTime;
currentPacket.SetStart(Configuration, _streamInfo);
_isFirstPacket = false;
}
currentPacket.SetFollowup(Configuration, _streamInfo);
_readBuffer.Write(packetBuffer, 0, bytesRead);
}
else
break;
}
}
//the memory buffer now contains enough bytes to satisfy the request
_readBuffer.Seek(internalBufferPos, SeekOrigin.Begin);
bytesRead = _readBuffer.Read(buffer, offset, count);
if (_readBuffer.Length > _maxInternalBufferLength)
{
int bytesLeft = (int)(_readBuffer.Length - _readBuffer.Position);
byte[] tempStreamBuffer = new byte[bytesLeft];
_readBuffer.Read(tempStreamBuffer, 0, bytesLeft);
_readBuffer = new MemoryStream();
_readBuffer.Write(tempStreamBuffer, 0, bytesLeft);
_readBuffer.Seek(0, SeekOrigin.Begin);
_allowSeekBack = false;
}
return bytesRead;
}
public void TryCreateInvalidPacket()
{
AsfFile asfFile = new AsfFile(testVideoFileName);
long offsetFirstPacket = asfFile.PacketConfiguration.AsfHeaderSize;
using (FileStream fs = new FileStream(testVideoFileName, FileMode.Open, FileAccess.Read))
{
fs.Seek(offsetFirstPacket, SeekOrigin.Begin);
byte[] packetData = new byte[asfFile.PacketConfiguration.AsfPacketSize];
fs.Read(packetData, 0, (int)asfFile.PacketConfiguration.AsfPacketSize);
packetData[0] = 1;
packetData[1] = 1;
AsfPacket packet = new AsfPacket(asfFile.PacketConfiguration, packetData);
}
}
public void CompareFirstDataPacket()
{
AsfFile asfFile = new AsfFile(testVideoFileName);
long offsetFirstPacket = asfFile.PacketConfiguration.AsfHeaderSize;
using (FileStream fs = new FileStream(testVideoFileName, FileMode.Open, FileAccess.Read))
{
fs.Seek(offsetFirstPacket, SeekOrigin.Begin);
byte[] packetData = new byte[asfFile.PacketConfiguration.AsfPacketSize];
fs.Read(packetData, 0, (int)asfFile.PacketConfiguration.AsfPacketSize);
AsfPacket packet = new AsfPacket(asfFile.PacketConfiguration, packetData);
Assert.AreEqual(packet.SendTime, asfFile.PacketConfiguration.Packets[0].SendTime);
Assert.AreEqual(packet.Payload.Count, asfFile.PacketConfiguration.Packets[0].Payload.Count);
for(int i=0;i< packet.Payload.Count;i++)
{
Assert.AreEqual(packet.Payload[i].PresentationTimeOffset, asfFile.PacketConfiguration.Packets[0].Payload[i].PresentationTimeOffset);
Assert.AreEqual(packet.Payload[i].PresentationTime, asfFile.PacketConfiguration.Packets[0].Payload[i].PresentationTime);
Assert.AreEqual(packet.Payload[i].StreamIDOffset, asfFile.PacketConfiguration.Packets[0].Payload[i].StreamIDOffset);
Assert.AreEqual(packet.Payload[i].StreamId, asfFile.PacketConfiguration.Packets[0].Payload[i].StreamId);
}
}
}
public override int Read(byte[] buffer, int offset, int count)
{
int bytesRead = 0;
long internalBufferPos;
if (_readBuffer.Length - _readBuffer.Position >= count)
{
return(_readBuffer.Read(buffer, offset, count));
}
byte[] packetBuffer = new byte[_asfConfig.AsfPacketSize];
internalBufferPos = _readBuffer.Position;
_readBuffer.Seek(0, SeekOrigin.End);
while (_readBuffer.Length - internalBufferPos < count)
{
//fill buffer
if (!_isHeaderStreamed && StreamType != AsfStreamType.asfUnaltered)
{
byte[] headerData = _asfFile.GetStreamingHeader();
_readBuffer.Write(headerData, 0, headerData.Length);
_isHeaderStreamed = true;
}
else
{
bytesRead = _asfFile.Read(packetBuffer, 0, (int)_asfConfig.AsfPacketSize);
if (bytesRead == _asfConfig.AsfPacketSize)
{
AsfPacket currentPacket = new AsfPacket(_asfConfig, packetBuffer);
if (_isFirstPacket)
{
_streamInfo.ResetMediaObjects();
_streamInfo.StartSendTime = currentPacket.SendTime;
currentPacket.SetStart(Configuration, _streamInfo);
_isFirstPacket = false;
}
currentPacket.SetFollowup(Configuration, _streamInfo);
_readBuffer.Write(packetBuffer, 0, bytesRead);
}
else
{
break;
}
}
}
//the memory buffer now contains enough bytes to satisfy the request
_readBuffer.Seek(internalBufferPos, SeekOrigin.Begin);
bytesRead = _readBuffer.Read(buffer, offset, count);
if (_readBuffer.Length > _maxInternalBufferLength)
{
int bytesLeft = (int)(_readBuffer.Length - _readBuffer.Position);
byte[] tempStreamBuffer = new byte[bytesLeft];
_readBuffer.Read(tempStreamBuffer, 0, bytesLeft);
_readBuffer = new MemoryStream();
_readBuffer.Write(tempStreamBuffer, 0, bytesLeft);
_readBuffer.Seek(0, SeekOrigin.Begin);
_allowSeekBack = false;
}
return(bytesRead);
}
