/// <summary>
/// (Virtual) Controls information about how input buffers are formatted
/// </summary>
/// <param name="dwInputStreamIndex">Input stream number</param>
/// <param name="pdwFlags">Flags specifying how input buffers need to be formatted</param>
/// <returns>S_OK for successful completion</returns>
/// <remarks>
/// Allows the implementor to specify flags controlling the format of input buffers. The default
/// implementation return FixedSampleSize | SingleSamplePerBuffer | WholeSamples
/// </remarks>
protected virtual int InternalGetInputStreamInfo(int dwInputStreamIndex, out DMOInputStreamInfo pdwFlags)
{
pdwFlags = DMOInputStreamInfo.FixedSampleSize |
DMOInputStreamInfo.SingleSamplePerBuffer |
DMOInputStreamInfo.WholeSamples;
return S_OK;
}
/// <summary>
/// COM entry point for IMediaObject.GetInputStreamInfo
/// </summary>
/// <remarks>
/// There should be no need to modify or override this method. It will call the
/// abstract and virtual methods to perform its work.
/// </remarks>
public int GetInputStreamInfo(int ulStreamIndex, out DMOInputStreamInfo pdwFlags)
{
int hr;
try
{
// Avoid multi-threaded access issues
lock(this)
{
pdwFlags = 0;
m_Log.Write("GetInputStreamInfo");
// Validate the stream number
if (ulStreamIndex < m_NumInputs && ulStreamIndex >= 0)
{
// Call the internal function to get the value
hr = InternalGetInputStreamInfo(ulStreamIndex, out pdwFlags);
// Validate the value returned by the internal function
Debug.Assert(0 == (pdwFlags & ~(DMOInputStreamInfo.WholeSamples |
DMOInputStreamInfo.SingleSamplePerBuffer |
DMOInputStreamInfo.FixedSampleSize |
DMOInputStreamInfo.HoldsBuffers)));
}
else
{
hr = DMOResults.E_InvalidStreamIndex;
}
m_Log.WriteNoTS(string.Format(": {0}\r\n", hr));
}
}
catch (Exception e)
{
// Generic handling of all exceptions. While .NET will turn exceptions into
// HRESULTS "automatically", I prefer to have some place I can set a breakpoint.
hr = CatFail(e);
// Have to have this to make the compiler happy.
pdwFlags = 0;
}
return hr;
}
/// <summary>
/// COM entry point for IMediaObject.GetInputStreamInfo
/// </summary>
/// <param name="streamIndex">The index of the stream.</param>
/// <param name="pflags">A <see cref="DMOInputStreamInfo"/>
/// with the stream flags.</param>
/// <returns>A HRESULT value.</returns>
/// <remarks>
/// There should be no need to modify or override this method. It will call the
/// abstract and virtual methods to perform its work.
/// </remarks>
public int GetInputStreamInfo(int streamIndex, out DMOInputStreamInfo pflags)
{
int hr;
try
{
// Avoid multi-threaded access issues
lock (this)
{
pflags = 0;
// Validate the stream number
if (streamIndex < this.numInputs && streamIndex >= 0)
{
// Call the internal function to get the value
hr = this.InternalGetInputStreamInfo(streamIndex, out pflags);
// Validate the value returned by the internal function
Debug.Assert(
0 == (pflags & ~(DMOInputStreamInfo.WholeSamples |
DMOInputStreamInfo.SingleSamplePerBuffer |
DMOInputStreamInfo.FixedSampleSize |
DMOInputStreamInfo.HoldsBuffers)),
"Wrong value");
}
else
{
hr = DMOResults.E_InvalidStreamIndex;
}
}
}
catch (Exception e)
{
// Generic handling of all exceptions. While .NET will turn exceptions into
// HRESULTS "automatically", I prefer to have some place I can set a breakpoint.
hr = this.CatFail(e);
// Have to have this to make the compiler happy.
pflags = 0;
}
return hr;
}
