[PD-dev] Midi overflow, when receiving Song Position Pointer (os x)

[Miller Puckette]

Hmm... just looking at the code in s_midi_pm.c I can't understand how
it could ever have worked for sysex or 'system' messages.  I'll see if
I can get MIDI running on a MAC so I can try to fix it.

cheers
Miller

On Wed, Jun 05, 2013 at 01:59:45PM +0200, Jan Baumgart wrote:
> I've found the bad guy: it's the old version of the PortMidi
> Library, that's packaged with pd's source. After replacing it with a
> newer version (131) and recompiling, the midi overflow bug is gone.
> I couldn't get the latest version of portmidi compiled on os x
> 10.6.8 (probably a cmake issue).
> 
> Now that all midi messages are coming in, I've noticed that pd
> handles some midi system messages incorrectly. Seems like Pd
> assumes, that system messages always carry three data bytes (like
> sysex messages). But there are messages like Midi Time Code or Song
> Position Pointer, which have one or two data bytes.
> 
> cheers,
> Jan
> 
> 
> 
> On 3.6.13 17:07 , Jan Baumgart wrote:
> >Seems like [midirealtimein] is working under os x (although there's an
> >obsolete error "message midirealtimein: works under MSW only").
> >
> >But when receiving a realtime messages (248, 250 or 252) [midiin] and
> >[notein] output 0.
> >Maybe this is related to the fifo overflow.
> >
> >Correction: the status byte for the song position pointer is 242 (dec -
> >not hex)
> >
> >On 3.6.13 15:18 , Jan Baumgart wrote:
> >>Hi there,
> >>
> >>I'm experiencing a severe bug, when sending a Song Position Pointer
> >>message (0x242 0 0) to pd.
> >>
> >>After sending just one SPP message to pd, the status window says:
> >>"warning: MIDI timing FIFO overflowed".
> >>
> >>When looking at the output of [midiin] I see "242 0 0 0" repeated
> >>endlessly.
> >>
> >>The Song Position Pointer message belongs to the System Common Messages
> >>and has two data bytes. Pd seems to get confused with this message.
> >>Where is the third data byte coming from?
> >>
> >>I'm running precompiled vanilla pd-0.44-3 from puckette's site on 32-bit
> >>intel mac (os x 10.6.8).
> >>
> >>
> >>I have a related second question: Is there any way to receive midi
> >>realtime messages with pd on os x? I'm trying to receive Midi Beat
> >>Clock...
> >>
> >>
> >>cheers,
> >>Jan
> 
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