[Jack-Devel] Dispersing MIDI messages: one to multiple
Hello all,
I have following question:
I have developed JACK MIDI client, which grabs midi messages from MIDI
keyboard on one port, and disperses it according to:
* if message is controlled message (functional button was pressed on MIDI
keyboard), it's changed to "volume control" and to certain channel and
transmited
* if message is "key up" or "key down", it's dispersed to channels from 1
to 4.
It works, but if I am using it, totaly at random sound output "hangs" for
like 10th of second.
I suspect my code is the problem. I would just like someone to examine it -
perhaps I am doiung something wrong here.
Or is there a better way to "disperse" one MIDI message to several channels?
I tried to find more detailed description of API than official docs (which
is... basic, I'd say), but no luck.
Thanks for any help or assistance in advanced!
Following is my processing callback:
static int process(jack_nframes_t nframes, void *arg)
{
int res = 0;
int i;
int j;
//unsigned char* buffer;
unsigned char jbuffer[3];
void* port_buf = jack_port_get_buffer(output_port, nframes);
//get events
void* in_port_buf = jack_port_get_buffer(input_port, nframes);
jack_nframes_t n = jack_midi_get_event_count(in_port_buf);
jack_midi_clear_buffer(port_buf);
if(n==0)
return 0;
jack_midi_event_t jev;
if(verb == 1)
printf("%i: Data arrived!\n", cnt);
for(i = 0;i<n;i++){
res = jack_midi_event_get(&jev,in_port_buf,i);
if(res == 0){
if(verb == 1){
printf("Got event, %i bytes!\n",(int) jev.size);
for(j=0;j<jev.size;j++)
printf("%i: %i\n",j,jev.buffer[j]);
}
} else{
if(verb == 1)
printf("ERROR getting event!\n");
return 0;
}
//transmit data
cnt++;
//buffer = jack_midi_event_reserve(port_buf, i, 3);
//controll to MIDI channel 1!
if(jev.buffer[0] == 176 && jev.buffer[1] == 97){
if(verb == 1)
printf("MUTE CONTROL CH1 sent\n");
//first button: set mute register on channel 1
//buffer[0] = 176;
//buffer[1] = 7;
//buffer[2] = jev.buffer[2];
jbuffer[0] = 176;
jbuffer[1] = 7;
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
else if(jev.buffer[0] == 176 && jev.buffer[1] == 96){
if(verb == 1)
printf("MUTE CONTROL to CH2 sent\n");
//second button: set mute register on channel 2
//buffer[0] = 177;
//buffer[1] = 7;
//buffer[2] = jev.buffer[2];
jbuffer[0] = 177;
jbuffer[1] = 7;
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
else if(jev.buffer[0] == 176 && jev.buffer[1] == 66){
if(verb == 1)
printf("MUTE CONTROL CH3 sent\n");
//third button: set mute register on channel 3
//buffer[0] = 176;
//buffer[1] = 7;
//buffer[2] = jev.buffer[2];
jbuffer[0] = 178;
jbuffer[1] = 7;
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
else if(jev.buffer[0] == 176 && jev.buffer[1] == 67){
if(verb == 1)
printf("MUTE CONTROL to CH4 sent\n");
//fourth button: set mute register on channel 4
//buffer[0] = 177;
//buffer[1] = 7;
//buffer[2] = jev.buffer[2];
jbuffer[0] = 179;
jbuffer[1] = 7;
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
else if(jev.buffer[0] == 176 && jev.buffer[1] == 64){
if(verb == 1)
printf("MUTE CONTROL to CH5 sent\n");
//fifth button: set mute register on channel 5
//buffer[0] = 177;
//buffer[1] = 7;
//buffer[2] = jev.buffer[2];
jbuffer[0] = 180;
jbuffer[1] = 7;
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
else if(jev.buffer[0] == 176 && jev.buffer[1] == 65){
if(verb == 1)
printf("MUTE CONTROL to CH6 sent\n");
//sixth button: set mute register on channel 6
//buffer[0] = 177;
//buffer[1] = 7;
//buffer[2] = jev.buffer[2];
jbuffer[0] = 181;
jbuffer[1] = 7;
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
else if(jev.buffer[0] == 176 && jev.buffer[1] == 7){
if(verb == 1)
printf("MUTE CONTROL to CH7 sent\n");
//seventh button: set mute register on channel 7
//buffer[0] = 177;
//buffer[1] = 7;
//buffer[2] = jev.buffer[2];
jbuffer[0] = 182;
jbuffer[1] = 7;
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
else if(jev.buffer[0] == 176 && jev.buffer[1] == 10){
if(verb == 1)
printf("MUTE CONTROL to CH8 sent\n");
//eighth button: set mute register on channel 8
//buffer[0] = 177;
//buffer[1] = 7;
//buffer[2] = jev.buffer[2];
jbuffer[0] = 183;
jbuffer[1] = 7;
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
else if((jev.buffer[0]& 0xF0) == 128 || (jev.buffer[0]& 0xF0) ==
144){
//note key, pass through
if(verb == 1)
printf("SOUND PASSED-THROUGH\n");
//notes; let them pass
//buffer[0] = jev.buffer[0];
//buffer[1] = jev.buffer[1];
//buffer[2] = jev.buffer[2];
jbuffer[0] = jev.buffer[0]; //CH1
jbuffer[1] = jev.buffer[1];
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time , jbuffer, 3);
jbuffer[0] = jev.buffer[0] + 1; //CH2
jbuffer[1] = jev.buffer[1];
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time , jbuffer, 3);
jbuffer[0] = jev.buffer[0] + 2; //CH3
jbuffer[1] = jev.buffer[1];
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time , jbuffer, 3);
jbuffer[0] = jev.buffer[0] + 3; //CH4
jbuffer[1] = jev.buffer[1];
jbuffer[2] = jev.buffer[2];
res = jack_midi_event_write(port_buf, jev.time , jbuffer, 3);
}
//res = jack_midi_event_write(port_buf, i, jev.buffer, 3);
//res = jack_midi_event_write(port_buf, jev.time, jbuffer, 3);
}
return 0;
}
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