Messages in this thread | | | Date | Mon, 27 Feb 2006 13:13:19 +0100 | From | Takashi Iwai <> | 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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At Mon, 27 Feb 2006 00:42:38 +0900, Junichi Uekawa wrote: > > 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.
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