private void OpenEtlFile()
{
// Retained the delegate objects to avoid GC.
EventRecordCallbackRetainer = new EventRecordCallback(EventRecordCallback);
BufferCallbackRetainer = new BufferCallback(BufferCallback);
// Open the ETL log file.
EVENT_TRACE_LOGFILE traceLogFile = new EVENT_TRACE_LOGFILE
{
LogFileName = EtlFilePath,
ProcessTraceMode = EventTracingApi.PROCESS_TRACE_MODE_EVENT_RECORD,
BufferCallback = BufferCallbackRetainer,
EventCallback = EventRecordCallbackRetainer,
};
TraceHandle = EventTracingApi.OpenTrace(ref traceLogFile);
if (EventTracingApi.IsInvalidProcessTraceHandle(TraceHandle))
{
var win32ErrorCode = Marshal.GetLastWin32Error();
string exceptionMessage;
if (win32ErrorCode == Win32ErrorCode.ERROR_FILE_CORRUPT)
{
exceptionMessage = string.Format("OpenTrace function failed. The file '{0}' is corrupted.", EtlFilePath);
}
else
{
exceptionMessage = string.Format("OpenTrace function failed. The file tried to open was '{0}'.", EtlFilePath);
}
throw new Win32Exception(win32ErrorCode, exceptionMessage);
}
}
long _forcedPicDuration = 3 * ONE_SECOND; // change this to 0 to encode each frame normally
#endregion Fields
#region Constructors
public MpegManager(String fileName, int format, int sourceWidth, int sourceHeight)
{
// Reset the start position
_curPicStart = 0;
// sourceWidth and sourceHeight is the expected size of the bitmaps
// If they do not match, they will be resized to that size
_expectedWidth = sourceWidth;
_expectedHeight = sourceHeight;
// Open the output mpeg file. The data is sent in the callback at the
// end of this file
_fileStream = File.Create(fileName);
_binaryWriter = new BinaryWriter(_fileStream);
// Initialize the encoder
StandardMpegEncoderDll.MediaFileInitialize();
cb = new BufferCallback(MpegBufferCallback);
// Select the format (mpeg-1, etc)
SelectFormat(format);
// Set the registration code
RegisterLibrary();
// Set the source width and height
StandardMpegEncoderDll.MediaFileSetParameter("nInputX", sourceWidth.ToString());
StandardMpegEncoderDll.MediaFileSetParameter("nInputY", sourceHeight.ToString());
// switch off audio
StandardMpegEncoderDll.MediaFileSetParameter("bWriteAudioStream", "0");
// Set the MPEG data callback function. If you wish, pass your
// user specific data as the first parameter
IntPtr myData = (IntPtr)0;
StandardMpegEncoderDll.MediaFileSetBufferCallback(myData, cb);
// Create the file
StandardMpegEncoderDll.MediaFileCreate();
}
/// <summary>
/// Begins buffering read-buffer.
/// </summary>
/// <param name="async">If true then this method can complete asynchronously. If false, this method completed always syncronously.</param>
/// <param name="asyncCallback">The callback that is executed when asynchronous operation completes.
/// If operation completes synchronously, no callback called.</param>
/// <returns>
/// Returns true if the I/O operation is pending. The BufferReadAsyncEventArgs.Completed event on the context parameter will be raised upon completion of the operation.
/// Returns false if the I/O operation completed synchronously. The BufferReadAsyncEventArgs.Completed event on the context parameter will not be raised and the context object passed as a parameter may be examined immediately after the method call returns to retrieve the result of the operation.
/// </returns>
/// <exception cref="InvalidOperationException">Is raised when there is data in read buffer and this method is called.</exception>
private bool BufferRead(bool async, BufferCallback asyncCallback)
{
if (BytesInReadBuffer != 0)
{
throw new InvalidOperationException("There is already data in read buffer.");
}
m_ReadBufferOffset = 0;
m_ReadBufferCount = 0;
m_pReadBufferOP.ReleaseEvents();
m_pReadBufferOP.Completed += delegate(object s, EventArgs<BufferReadAsyncOP> e)
{
if (e.Value.Error != null)
{
if (asyncCallback != null)
{
asyncCallback(e.Value.Error);
}
}
else
{
m_ReadBufferOffset = 0;
m_ReadBufferCount = e.Value.BytesInBuffer;
m_BytesReaded += e.Value.BytesInBuffer;
m_LastActivity = DateTime.Now;
if (asyncCallback != null)
{
asyncCallback(null);
}
}
};
if (async)
{
//Console.WriteLine(new StackTrace().ToString());
}
if (!m_pReadBufferOP.Start(async, m_pReadBuffer, m_pReadBuffer.Length))
{
return true;
}
else
{
if (m_pReadBufferOP.Error != null)
{
throw m_pReadBufferOP.Error;
}
else
{
m_ReadBufferOffset = 0;
m_ReadBufferCount = m_pReadBufferOP.BytesInBuffer;
m_BytesReaded += m_pReadBufferOP.BytesInBuffer;
m_LastActivity = DateTime.Now;
}
return false;
}
/* REMOVE ME:
if(!m_pReadBufferOP.Start(m_pReadBuffer,m_pReadBuffer.Length)){
if(async == false){
// Wait while async operation completes.
while(!m_pReadBufferOP.IsCompleted){
Thread.Sleep(1);
}
return false;
}
else{
return true;
}
}
else{
if(m_pReadBufferOP.Error != null){
throw m_pReadBufferOP.Error;
}
else{
m_ReadBufferOffset = 0;
m_ReadBufferCount = m_pReadBufferOP.BytesInBuffer;
m_BytesReaded += m_pReadBufferOP.BytesInBuffer;
m_LastActivity = DateTime.Now;
}
return false;
} */
}
/// <summary>
/// Begins buffering read-buffer.
/// </summary>
/// <param name="async">If true then this method can complete asynchronously. If false, this method completed always syncronously.</param>
/// <param name="asyncCallback">The callback that is executed when asynchronous operation completes.
/// If operation completes synchronously, no callback called.</param>
/// <returns>
/// Returns true if the I/O operation is pending. The BufferReadAsyncEventArgs.Completed event on the context parameter will be raised upon completion of the operation.
/// Returns false if the I/O operation completed synchronously. The BufferReadAsyncEventArgs.Completed event on the context parameter will not be raised and the context object passed as a parameter may be examined immediately after the method call returns to retrieve the result of the operation.
/// </returns>
/// <exception cref="InvalidOperationException">Is raised when there is data in read buffer and this method is called.</exception>
private bool BufferRead(bool async,BufferCallback asyncCallback)
{
if(this.BytesInReadBuffer != 0){
throw new InvalidOperationException("There is already data in read buffer.");
}
m_ReadBufferOffset = 0;
m_ReadBufferCount = 0;
#region async
if(async){
m_pReadBufferOP.ReleaseEvents();
m_pReadBufferOP.Completed += new EventHandler<EventArgs<BufferReadAsyncOP>>(delegate(object s,EventArgs<BufferReadAsyncOP> e){
if(e.Value.Error != null){
if(asyncCallback != null){
asyncCallback(e.Value.Error);
}
}
else{
m_ReadBufferOffset = 0;
m_ReadBufferCount = e.Value.BytesInBuffer;
m_BytesReaded += e.Value.BytesInBuffer;
m_LastActivity = DateTime.Now;
if(asyncCallback != null){
asyncCallback(null);
}
}
});
if(!m_pReadBufferOP.Start(async,m_pReadBuffer,m_pReadBuffer.Length)){
return true;
}
else{
if(m_pReadBufferOP.Error != null){
throw m_pReadBufferOP.Error;
}
else{
m_ReadBufferOffset = 0;
m_ReadBufferCount = m_pReadBufferOP.BytesInBuffer;
m_BytesReaded += m_pReadBufferOP.BytesInBuffer;
m_LastActivity = DateTime.Now;
}
return false;
}
}
#endregion
#region sync
else{
int countReaded = m_pStream.Read(m_pReadBuffer,0,m_pReadBuffer.Length);
m_ReadBufferCount = countReaded;
m_BytesReaded += countReaded;
m_LastActivity = DateTime.Now;
return false;
}
#endregion
}
public static extern int MediaFileSetBufferCallback(IntPtr pUserData, BufferCallback callbackFunc);
public static extern IntPtr SCL_CreateMonitorCaptureConfiguration(BufferCallback callback);
public static extern int MediaFileSetBufferCallback(IntPtr pUserData, BufferCallback callbackFunc);
