On Friday 14 February 2003 16:18, Steve Harris wrote: > On Fri, Feb 14, 2003 at 03:54:35 +0100, Roger Larsson wrote: > > On Friday 14 February 2003 15:02, Steve Harris wrote: > > > Hi all, > > > > > > I'm trying to hack up a quick app that sends MIDI clock pulses in sync > > > with a ringbuffer playback. > > > > > > I've got it reading MIDI (thanks to Matthias' great exmaple code), but I > > > cant figure out how to send MIDI clock pulses explicitly. The ALSA seq > > > interface lets me set it up to go automatically, but I want to send a > > > clock pulse every 1/24th of the buffer, so the sync is correct. > > > > > > > How about dividing the buffer in 24 frames. And send one MIDI event each > > frame? Doable? > > That's exactly what I'm trying to do, but I can't figure out how to > construct the midi clock event. >
Run with 24 frames and a frame size of (needed buffer / 24). Run this with sched fifo, etc... Output 24 frames of silence. Write some more silent frames (it wont be accepted before one is free), send MIDI event for each. [Gives the MIDI device time to sync] Write a frame of real data. Send MIDI event. Repeat. This would give you some jitter but the MIDI device should filter that. /RogerL -- Roger Larsson Skellefte� Sweden
