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;
I'm not sure if this is something hardware-specific or not.
$ uname -a
Linux dancer64 2.6.16-rc4dancer-g9e956c2d-dirty #1 Thu Feb 23 22:06:47 JST 2006 x86_64 GNU/Linux
$ ./seqdump.c # this program is attached the end of the mail.
noteon 0 3c 4e
noteon 0 3c 0
noteon 0 3e 4d
noteon 0 3e 0
noteon 0 40 54
noteon 0 40 0
noteon 0 41 4f
noteon 0 41 0
noteon 0 45 4c
noteon 0 45 0
noteon 0 43 4f
noteon 0 43 0
noteon 0 41 56
noteon 0 41 0
noteon 0 40 4f
noteon 0 40 0
noteon 0 3e 4c
noteon 0 3e 0
$ lsusb -s3:7 -v
Bus 003 Device 007: ID 0763:0192 Midiman
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0763 Midiman
idProduct 0x0192
bcdDevice 1.25
iManufacturer 1 M-Audio
iProduct 2 USB Keystation 88es
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 101
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 3 Audio Class
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 9
bInCollection 1
baInterfaceNr( 0) 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 3 MIDI Streaming
bInterfaceProtocol 0
iInterface 0
MIDIStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 65
MIDIStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (MIDI_IN_JACK)
bJackType 1 Embedded
bJackID 1
iJack 0
MIDIStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (MIDI_IN_JACK)
bJackType 2 External
bJackID 2
iJack 0
MIDIStreaming Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (MIDI_OUT_JACK)
bJackType 1 Embedded
bJackID 3
bNrInputPins 1
baSourceID( 0) 2
BaSourcePin( 0) 1
iJack 0
MIDIStreaming Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (MIDI_OUT_JACK)
bJackType 2 External
bJackID 4
bNrInputPins 1
baSourceID( 0) 1
BaSourcePin( 0) 1
iJack 0
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
bRefresh 0
bSynchAddress 0
MIDIStreaming Endpoint Descriptor:
bLength 5
bDescriptorType 37
bDescriptorSubtype 1 (GENERAL)
bNumEmbMIDIJack 1
baAssocJackID( 0) 3
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
bRefresh 0
bSynchAddress 0
MIDIStreaming Endpoint Descriptor:
bLength 5
bDescriptorType 37
bDescriptorSubtype 1 (GENERAL)
bNumEmbMIDIJack 1
baAssocJackID( 0) 1
Device Status: 0x0000
(Bus Powered)
$ lsmod
Module Size Used by
snd_usb_audio 89280 0
snd_usb_lib 17856 1 snd_usb_audio
snd_hwdep 11720 1 snd_usb_audio
snd_seq_dummy 4484 0
snd_seq_oss 36260 0
snd_seq_midi 9920 0
snd_rawmidi 28768 2 snd_usb_lib,snd_seq_midi
snd_seq_midi_event 8384 2 snd_seq_oss,snd_seq_midi
snd_seq 56600 9 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_seq_device 10320 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
ipt_recent 11736 2
ip_nat_irc 3200 0
ip_nat_ftp 4352 0
ip_conntrack_irc 7840 1 ip_nat_irc
ip_conntrack_ftp 8872 1 ip_nat_ftp
xt_state 2560 3
ipt_MASQUERADE 3904 1
ipt_LOG 7296 7
iptable_mangle 3392 0
ipt_TCPMSS 4800 0
xt_tcpmss 3072 0
xt_tcpudp 3968 2
iptable_filter 3584 1
iptable_nat 9412 1
ip_nat 19576 4 ip_nat_irc,ip_nat_ftp,ipt_MASQUERADE,iptable_nat
ip_tables 13728 3 iptable_mangle,iptable_filter,iptable_nat
ip_conntrack 55368 8 ip_nat_irc,ip_nat_ftp,ip_conntrack_irc,ip_conntrack_ftp,xt_state,ipt_MASQUERADE,iptable_nat,ip_nat
x_tables 15176 9 ipt_recent,xt_state,ipt_MASQUERADE,ipt_LOG,ipt_TCPMSS,xt_tcpmss,xt_tcpudp,iptable_nat,ip_tables
pppoe 15936 2
pppox 4432 1 pppoe
af_packet 23756 4
tsdev 9280 0
pcspkr 3848 0
tuner 57644 0
bttv 207164 0
video_buf 25156 1 bttv
compat_ioctl32 9856 1 bttv
v4l2_common 9984 3 tuner,bttv,compat_ioctl32
btcx_risc 5768 1 bttv
ir_common 11076 1 bttv
tveeprom 18064 1 bttv
videodev 12096 1 bttv
snd_atiixp 21592 0
snd_ac97_codec 108668 1 snd_atiixp
snd_ac97_bus 2944 1 snd_ac97_codec
snd_pcm_oss 57056 0
snd_mixer_oss 19328 1 snd_pcm_oss
snd_pcm 98060 4 snd_usb_audio,snd_atiixp,snd_ac97_codec,snd_pcm_oss
snd_timer 25736 2 snd_seq,snd_pcm
snd 64384 15 snd_usb_audio,snd_usb_lib,snd_hwdep,snd_seq_dummy,snd_seq_oss,snd_rawmidi,snd_seq,snd_seq_device,snd_atiixp,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
snd_page_alloc 12240 2 snd_atiixp,snd_pcm
generic 5764 0 [permanent]
shpchp 49216 0
pci_hotplug 12548 1 shpchp
ide_scsi 18244 0
psmouse 42376 0
rtc 14392 0
unix 31096 419
regards,
junichi
--
dancer@{debian.org,netfort.gr.jp} Debian Project
===File ~/cvscheckout/whole/danceraudiotools/seqmidi/seqdump.c===
/*BINFMTC: -lasound
Connects to ALSA sequencer port and dumps NOTE ON and NOTE OFF events.
*/
#include <stdio.h>
#include <alsa/asoundlib.h>
int main(int argc, char **argv)
{
snd_seq_t *seq;
int err;
int port;
snd_seq_event_t *ev;
err=snd_seq_open(&seq, "default", SND_SEQ_OPEN_INPUT, 0);
if (err < 0)
{
fprintf(stderr, "Cannot open default sequencer port\n");
return 1;
}
snd_seq_set_client_name(seq, "Dancer Midi Seqdump");
port = snd_seq_create_simple_port(seq, "input port1",
SND_SEQ_PORT_CAP_WRITE|SND_SEQ_PORT_CAP_SUBS_WRITE,
SND_SEQ_PORT_TYPE_APPLICATION);
if (port < 0)
{
fprintf(stderr, "Cannot open port\n");
return 1;
}
while (snd_seq_event_input(seq, &ev) >= 0)
{
switch (ev->type)
{
case SND_SEQ_EVENT_NOTEON:
printf("noteon %x %x %x\n", ev->data.note.channel, ev->data.note.note, ev->data.note.velocity);
break;
case SND_SEQ_EVENT_NOTEOFF:
printf("noteoff %x %x %x\n", ev->data.note.channel, ev->data.note.note, ev->data.note.velocity);
break;
}
}
}
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