A few weeks ago I posted a bug report on DX MIDI in thread.
Now Stephan found a beautiful solution with clone deleting technique, where
here is another
upgrade to that idea. The code below doesn't lend in the bug zone no matter what
size the data is (well from 1 to 44 bytes of data can be send in single
streamPointer).
So thanks Stephan.
Peace
Waldemar
pStreamPointer = KsPinGetLeadingEdgeStreamPointer(
pin,
KSSTREAM_POINTER_STATE_LOCKED
);
//Set and send data to DX driver.
if ( SUCCESS( Status ) )
{
//DX driver uses DMUS_EVENTHEADER.
//
//typedef struct _DMUS_EVENTHEADER
//{
// DWORD cbEvent; Unrounded bytes in event
// DWORD dwChannelGroup; Channel group of event
// REFERENCE_TIME rtDelta; Delta from start time of entire
buffer
// DWORD dwFlags; Flags DMUS_EVENT_xxx
//} DMUS_EVENTHEADER;
//
//Initialize.
pData = (DMUS_EVENTHEADER*)pStreamPointer_clone->OffsetOut.Data;
pData_midi = (BYTE*)( pData + 1 );
byteCount = pMidiCommand->offsetInData;
//Set dataUsed and DMUS_EVENTHEADER.
pStreamPointer_clone->StreamHeader->DataUsed = DMUS_EVENT_SIZE( byteCount );
pData->cbEvent = byteCount;
pData->dwChannelGroup = 0;
pData->rtDelta = 0;
if ( byteCount > 3 )
{
pData->dwFlags = 0; //no order (DMUS_EVENT_STRUCTURED)
}
else
{
pData->dwFlags = DMUS_EVENT_STRUCTURED;
}
//Set data.
RtlCopyBytes( pData_midi, &pMidiCommand->data, byteCount );
//Set the streamPointer.
pStreamPointer_clone->StreamHeader->PresentationTime.Time =
pMidiCommand->timeStamp;
pStreamPointer_clone->StreamHeader->PresentationTime.Denominator = 1;
pStreamPointer_clone->StreamHeader->PresentationTime.Numerator = 1;
pStreamPointer_clone->StreamHeader->OptionsFlags |=
KSSTREAM_HEADER_OPTIONSF_TIMEVALID;
//Advance streamPointer and unlock it (the brute force way).
KsStreamPointerAdvanceOffsetsAndUnlock(
pStreamPointer,
0,
0,
TRUE
);
}
return;
}
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.de/
