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/*
* VST instrument support
*
* Derived from code that was marked:
* Copyright (C) Kjetil S. Matheussen 2004 (k.s.matheussen@notam02.no)
* Alsa-seq midi-code made by looking at the jack-rack source made by Bob Ham.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: vsti.c,v 1.2 2004/04/07 01:56:23 pauld Exp $
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <memory.h>
#include <fcntl.h>
#include <stdbool.h>
#include <jackvst.h>
#include <vestige/aeffectx.h>
#include <pthread.h>
#include <sched.h>
snd_seq_t *
create_sequencer (const char* client_name, bool isinput)
{
snd_seq_t * seq;
int err;
if ((err = snd_seq_open (&seq, "default", SND_SEQ_OPEN_DUPLEX, 0)) != 0) {
fst_error ("Could not open ALSA sequencer, aborting\n\n%s\n\n"
"Make sure you have configure ALSA properly and that\n"
"/proc/asound/seq/clients exists and contains relevant\n"
"devices (%s).",
snd_strerror (err));
return NULL;
}
snd_seq_set_client_name (seq, client_name);
if ((err = snd_seq_create_simple_port (seq, isinput? "Input" : "Output",
(isinput? SND_SEQ_PORT_CAP_WRITE: SND_SEQ_PORT_CAP_READ)| SND_SEQ_PORT_CAP_DUPLEX |
SND_SEQ_PORT_CAP_SUBS_READ|SND_SEQ_PORT_CAP_SUBS_WRITE,
SND_SEQ_PORT_TYPE_APPLICATION|SND_SEQ_PORT_TYPE_SPECIFIC)) != 0) {
fst_error ("Could not create ALSA port: %s", snd_strerror (err));
snd_seq_close(seq);
return NULL;
}
return seq;
}
static void
queue_midi (JackVST *jvst, int val1, int val2, int val3)
{
struct VstMidiEvent *pevent;
jack_ringbuffer_data_t vec[2];
jack_ringbuffer_get_write_vector (jvst->event_queue, vec);
if (vec[0].len < sizeof (struct VstMidiEvent)) {
fst_error ("event queue has no write space");
return;
}
pevent = (struct VstMidiEvent *) vec[0].buf;
// printf("note: %d\n",note);
pevent->type = kVstMidiType;
pevent->byteSize = 24;
pevent->deltaFrames = 0;
pevent->flags = 0;
pevent->detune = 0;
pevent->noteLength = 0;
pevent->noteOffset = 0;
pevent->reserved1 = 0;
pevent->reserved2 = 0;
pevent->noteOffVelocity = 0;
pevent->midiData[0] = val1;
pevent->midiData[1] = val2;
pevent->midiData[2] = val3;
pevent->midiData[3] = 0;
//printf("Sending: %x %x %x\n",val1,val2,val3);
jack_ringbuffer_write_advance (jvst->event_queue, sizeof (struct VstMidiEvent));
}
void *midireceiver(void *arg)
{
snd_seq_event_t *event;
JackVST *jvst = (JackVST* )arg;
int val;
struct sched_param scp;
scp.sched_priority = 50;
// Try to set fifo priority...
// this works, if we are root or newe sched-cap manegment is used...
pthread_setschedparam( pthread_self(), SCHED_FIFO, &scp );
while (1) {
snd_seq_event_input (jvst->seq, &event);
if (jvst->midiquit) {
break;
}
switch(event->type){
case SND_SEQ_EVENT_NOTEON:
queue_midi(jvst,0x90+event->data.note.channel,event->data.note.note,event->data.note.velocity);
//printf("Noteon, channel: %d note: %d vol: %d\n",event->data.note.channel,event->data.note.note,event->data.note.velocity);
break;
case SND_SEQ_EVENT_NOTEOFF:
queue_midi(jvst,0x80+event->data.note.channel,event->data.note.note,0);
//printf("Noteoff, channel: %d note: %d vol: %d\n",event->data.note.channel,event->data.note.note,event->data.note.velocity);
break;
case SND_SEQ_EVENT_KEYPRESS:
//printf("Keypress, channel: %d note: %d vol: %d\n",event->data.note.channel,event->data.note.note,event->data.note.velocity);
queue_midi(jvst,0xa0+event->data.note.channel,event->data.note.note,event->data.note.velocity);
break;
case SND_SEQ_EVENT_CONTROLLER:
queue_midi(jvst,0xb0+event->data.control.channel,event->data.control.param,event->data.control.value);
//printf("Control: %d %d %d\n",event->data.control.channel,event->data.control.param,event->data.control.value);
break;
case SND_SEQ_EVENT_PITCHBEND:
val=event->data.control.value + 0x2000;
queue_midi(jvst,0xe0+event->data.control.channel,val&127,val>>7);
//printf("Pitch: %d %d %d\n",event->data.control.channel,event->data.control.param,event->data.control.value);
break;
case SND_SEQ_EVENT_CHANPRESS:
//printf("chanpress: %d %d %d\n",event->data.control.channel,event->data.control.param,event->data.control.value);
queue_midi(jvst,0xd0+event->data.control.channel,event->data.control.value,0);
break;
case SND_SEQ_EVENT_PGMCHANGE:
//printf("pgmchange: %d %d %d\n",event->data.control.channel,event->data.control.param,event->data.control.value);
queue_midi(jvst,0xc0+event->data.control.channel,event->data.control.value,0);
break;
default:
//printf("Unknown type: %d\n",event->type);
break;
}
}
return NULL;
}
void stop_midireceiver (JackVST *jvst)
{
int err;
snd_seq_event_t event;
snd_seq_t *seq2 = create_sequencer ("jfstquit", true);
jvst->midiquit = 1;
snd_seq_connect_to (seq2, 0, snd_seq_client_id (jvst->seq),0);
snd_seq_ev_clear (&event);
snd_seq_ev_set_direct (&event);
snd_seq_ev_set_subs (&event);
snd_seq_ev_set_source (&event, 0);
snd_seq_ev_set_controller (&event,1,0x80,50);
if ((err = snd_seq_event_output (seq2, &event)) < 0) {
fst_error ("cannot send stop event to midi thread: %s\n",
snd_strerror (err));
}
snd_seq_drain_output (seq2);
snd_seq_close (seq2);
pthread_join (jvst->midi_thread,NULL);
snd_seq_close (jvst->seq);
}
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