[directmusic] Playing multiple MIDI segments, aligned
- From: Abhijit Patait <abhijit_patait@xxxxxxxxx>
- To: directmusic@xxxxxxxxxxxxx
- Date: Tue, 11 May 2004 17:43:39 -0700 (PDT)
I am writing an application where I want to play multiple MIDI files
simultaneously. In order to play these files, I load each file into a segment,
and call PlaySegmentEx(...) on each of the segments (actually, I am using the
class CSegment from Todor Fay's book "DirectX 9 Audio Exposed"). I want the
segments to be aligned to the beginning, and therefore, I play the first
segment as primary segment and all others as secondary segments with the
appropriate alignment flags. Here is the code snippet that achieves the above.
BOOL bFirstSegment = TRUE;
// Assume that CString filename[] contains names of the MIDI files to be played
for (i = 0; i < 2; i++)
{
WCHAR wzFileName[DMUS_MAX_FILENAME];
mbstowcs(wzFileName, filename[i].GetBuffer(DMUS_MAX_FILENAME),
DMUS_MAX_FILENAME);
CSegment *pSegment = pAudio->LoadSegment(wzFileName);
// Use default flags for first segment
if (!bFirstSegment)
pSegment->SetFlags(DMUS_SEGF_SECONDARY | DMUS_SEGF_SEGMENTEND |
DMUS_SEGF_ALIGN | DMUS_SEGF_VALID_START_BEAT);
bFirstSegment = FALSE;
}
The first segment loads and starts playing, but as soon as the second segment
starts playing, the first gets muted, even though the two segments are aligned
as expected. However, I don't understand why the first segment gets muted.
I have tried the experiment with the same two MIDI files, with "Segment Jones"
application provided with the above-mentioned book, and have seen the same
results (secondary segment muting the primary segment).
How can I play both segments simultaneously?
I would really appreciate someone helping me on this.
Thank you in advance.
-Abhijit
PS: If needed, I can send additional code snippets and/or the MIDI files that I
am using for this experiment. The test MIDI files contain a sequence of about
20 note on/off messages. Both midi files have the same length and same note
on/off sequence, but on different channels with different patches (instruments).
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