Hi,
Have recently completed a test app using portmidi to send sysex
messages to some hardware we are working on. Using a USB analyzer it
became clear that there was an error in the library (portmidi28aug06) we
tracked this down to the winmm_end_sysex() function, here is the
offending code.
I don't have an explanation for this just that it now works.
static PmError winmm_end_sysex(PmInternal *midi, PmTimestamp timestamp)
{
midiwinmm_type m = (midiwinmm_type) midi->descriptor;
PmError rslt = pmNoError;
assert(m);
if (midi->latency == 0) {
/* Not using the stream interface. The entire sysex message is
in m->hdr, and we send it using midiOutLongMsg.
*/
// Here are the changes... this,
// m->hdr->dwBytesRecorded = m->sysex_byte_count;
// becomes this.
m->hdr->dwBytesRecorded = 0;
m->hdr->dwBufferLength = m->sysex_byte_count;
/*
{ int i; int len = m->hdr->dwBytesRecorded;
printf("OutLongMsg %d ", len);
for (i = 0; i < len; i++) {
printf("%2x ", msg_buffer[i]);
}
}
*/
m->error = midiOutLongMsg(m->handle.out, m->hdr,
sizeof(MIDIHDR));
if (m->error) rslt = pmHostError;
} else if (m->hdr) {
/* Using stream interface. There are accumulated bytes in m->hdr
to send using midiStreamOut
*/
/* add bytes recorded to MIDIEVENT length, but don't
count the MIDIEVENT data (3 longs) */
MIDIEVENT *evt = (MIDIEVENT *) m->hdr->lpData;
evt->dwEvent += m->hdr->dwBytesRecorded - 3 * sizeof(long);
/* round up BytesRecorded to multiple of 4 */
m->hdr->dwBytesRecorded = (m->hdr->dwBytesRecorded + 3) & ~3;
m->error = midiStreamOut(m->handle.stream, m->hdr,
sizeof(MIDIHDR));
if (m->error) {
rslt = pmHostError;
}
}
m->hdr = NULL; /* make sure we don't send it again */
return rslt;
}
Nigel
--
Nigel Brown, nbrown(at)akaitech(dot)com
Akai Digital Technology Group, Cambridge
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