//------------------------------------------------------------------------------
// Name: Open()
// Desc: Creates the reader and opens the file.
//------------------------------------------------------------------------------
public void Open(string ptszFile)
{
Close();
m_hrAsync = 0;
//
// Open input file
//
m_pStream.Open(ptszFile);
//
// initial state is "not set".
//
m_hEvent.Reset();
//
// Open the stream
//
m_pReader2.OpenStream(m_pStream, this, IntPtr.Zero);
//
// Wait for the open to finish
//
m_hEvent.WaitOne(-1, false);
int i;
m_pReader.GetOutputCount(out i);
m_SampleCount = new int[i];
// Turn on the user clock. This will send samples to IWMReaderCallback::OnSample as fast
// as it can. If you comment this line out, samples will be sent at the rate specified
// in the file (ie a 47 second clip will take 47 seconds to process).
m_pReader2.SetUserProvidedClock(true);
//
// Check open operation result
//
if (m_hrAsync < 0)
{
throw new COMException("Open failed", m_hrAsync);
}
}
private void TestOutput()
{
int iCount, IFCount;
IWMOutputMediaProps pProp;
m_read.GetOutputCount(out iCount);
Debug.Assert(iCount != 0);
m_read.GetOutputProps(0, out pProp);
Debug.Assert(pProp != null);
m_read.SetOutputProps(0, pProp);
m_read.GetOutputFormatCount(0, out IFCount);
Debug.Assert(IFCount != 0);
pProp = null;
m_read.GetOutputFormat(0, 0, out pProp);
Debug.Assert(pProp != null);
}
private void GetAudioOutput()
{
int cOutputs = 0;
short i;
IWMOutputMediaProps pProps = null;
AMMediaType pMediaType = null;
int cbType = 0;
//
// Sanity check
//
if (IsDisposed())
{
throw new COMException("Instance has been Disposed", E_Unexpected);
}
//
// Find out the output count
//
m_pReader.GetOutputCount(out cOutputs);
//
// Find one audio output.
// Note: This sample only shows how to handle one audio output.
// If there is more than one audio output, the first one will be picked.
//
StringBuilder sName = null;
for (i = 0; i < cOutputs; i++)
{
m_pReader.GetOutputProps(i, out pProps);
try
{
//
// Find out the space needed for pMediaType
//
cbType = 0;
pMediaType = null;
pProps.GetMediaType(pMediaType, ref cbType);
// Get the name of the output we'll be using
sName = null;
short iName = 0;
pProps.GetConnectionName(sName, ref iName);
sName = new StringBuilder(iName);
pProps.GetConnectionName(sName, ref iName);
pMediaType = new AMMediaType();
pMediaType.formatSize = cbType - Marshal.SizeOf(typeof(AMMediaType));
//
// Get the value for MediaType
//
pProps.GetMediaType(pMediaType, ref cbType);
try
{
if (MediaType.Audio == pMediaType.majorType)
{
m_pWfx = new WaveFormatEx();
Marshal.PtrToStructure(pMediaType.formatPtr, m_pWfx);
break;
}
}
finally
{
WMUtils.FreeWMMediaType(pMediaType);
}
}
finally
{
Marshal.ReleaseComObject(pProps);
}
}
if (i == cOutputs)
{
throw new COMException("Could not find an audio stream in the specified file", E_Unexpected);
}
m_dwAudioOutputNum = i;
// Only deliver samples for the single output
SetStreams(sName.ToString());
}
