Messages in this thread | | | Date | Mon, 27 Feb 2006 22:52:22 +0900 | From | Junichi Uekawa <> | Subject | Re: [Alsa-devel] [BUG] 2.6.16-rc4 git, ALSA USB-MIDI does not give NOTEOFF event for M-Audio Keystation 88es, but NOTEON with velocity=0 |
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Hi,
> > I'm seeing that USB MIDI keyboard (M-Audio Keystation 88es) is > > generating note-on events on both note-on and note-off. The difference > > being that note-off is generating an note-on event with velocity '0'. > > > > The following code in seq_midi_emul.c(snd_midi_process_event) looks > > suspiciously like what's needed for this device: > > > > /* Make sure that we don't have a note on that should really be > > * a note off */ > > if (ev->type == SNDRV_SEQ_EVENT_NOTEON && ev->data.note.velocity == 0) > > ev->type = SNDRV_SEQ_EVENT_NOTEOFF; > > This code is irrelevant. This is for MIDI emulation like emu10k1 > WaveTable, not for the real MIDI device. > > Basically the given behavior is not a bug. The sequencer handles > note-on with velocity 0 as it is. As a strict definition, note-off > and note-on with zero velocity are different although they are used > widely as identical in order to save bytes.
Thanks; I've looked into MIDI specs, and it was documented everywhere; it was just not obvious when I was looking into ALSA docs.
regards, junichi -- dancer@{debian.org,netfort.gr.jp} Debian Project - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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