[directmusic] Re: ReferenceToMusicTime returns music time = 0
- From: Abhijit Patait <abhijit_patait@xxxxxxxxx>
- To: directmusic@xxxxxxxxxxxxx
- Date: Thu, 15 Jul 2004 13:01:34 -0700 (PDT)
I found the cause of the problem, and am posting it here for the benefit of
others. I was passing a difference of two REFERENCE_TIME variables to
ReferenceToMusicTime(...). Apparently, ReferenceToMusicTime(...) does not like
that. It seems to require absolute REFERENCE_TIME. I was passing the difference
because I wanted to have the time relative to a pre-determined event (first
MIDI message captured).
The work-around was to convert each REFERENCE_TIME to MUSIC_TIME separately,
and then take the difference of the MUSIC_TIME variables. That works!!
-Abhijit
Abhijit Patait <abhijit_patait@xxxxxxxxx> wrote:
I am having problems calling the function
IDirectMusicPerformance8::ReferenceToMusicTime(...) on a properly initialized
performance interface. The music time returned is zero. Here is the code:
// Assume that pPerf is the pointer to the IDirectMusicPerformance8 interface
pPerf->ReferenceToMusicTime(rt, &startTime);
I have verified that rt is valid when the above function is called.
Somewhere before calling this function, I am setting the performance's master
tempo via the following call
// Assume that ratio contains proper ratio for the desired tempo
pPerf->SetGlobalParam(GUID_PerfMasterTempo, (void *) &ratio, sizeof(float))))
What could be wrong here? Does the performance object need to be initialized in
any other way (other than InitAudio) before calling ReferenceToMusicTime(...)?
Thank you
Abhijit
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