libs/fst/vsti.c

   1 /*
   2  *   VST instrument support
   3  *
   4  *   Derived from code that was marked:
   5  *   Copyright (C) Kjetil S. Matheussen 2004 (k.s.matheussen@notam02.no)
   6  *   Alsa-seq midi-code made by looking at the jack-rack source made by Bob Ham.
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *   $Id: vsti.c,v 1.2 2004/04/07 01:56:23 pauld Exp $
  23  */
  24
  25 #include <stdio.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include <memory.h>
  30 #include <fcntl.h>
  31 #include <stdbool.h>
  32 #include <jackvst.h>
  33 #include <vestige/aeffectx.h>
  34 #include <pthread.h>
  35 #include <sched.h>
  36
  37 snd_seq_t *
  38 create_sequencer (const char* client_name, bool isinput)
  39 {
  40         snd_seq_t * seq;
  41         int err;
  42
  43         if ((err = snd_seq_open (&seq, "default", SND_SEQ_OPEN_DUPLEX, 0)) != 0) {
  44                 fst_error ("Could not open ALSA sequencer, aborting\n\n%s\n\n"
  45                            "Make sure you have configure ALSA properly and that\n"
  46                            "/proc/asound/seq/clients exists and contains relevant\n"
  47                            "devices (%s).",
  48                            snd_strerror (err));
  49                 return NULL;
  50         }
  51
  52         snd_seq_set_client_name (seq, client_name);
  53
  54         if ((err = snd_seq_create_simple_port (seq, isinput? "Input" : "Output",
  55                                                (isinput? SND_SEQ_PORT_CAP_WRITE: SND_SEQ_PORT_CAP_READ)| SND_SEQ_PORT_CAP_DUPLEX |
  56                                                SND_SEQ_PORT_CAP_SUBS_READ|SND_SEQ_PORT_CAP_SUBS_WRITE,
  57                                                SND_SEQ_PORT_TYPE_APPLICATION|SND_SEQ_PORT_TYPE_SPECIFIC)) != 0) {
  58                 fst_error ("Could not create ALSA port: %s", snd_strerror (err));
  59                 snd_seq_close(seq);
  60                 return NULL;
  61         }
  62
  63         return seq;
  64 }
  65
  66 static void
  67 queue_midi (JackVST *jvst, int val1, int val2, int val3)
  68 {
  69         struct VstMidiEvent *pevent;
  70         jack_ringbuffer_data_t vec[2];
  71
  72         jack_ringbuffer_get_write_vector (jvst->event_queue, vec);
  73
  74         if (vec[0].len < sizeof (struct VstMidiEvent)) {
  75                 fst_error ("event queue has no write space");
  76                 return;
  77         }
  78
  79         pevent = (struct VstMidiEvent *) vec[0].buf;
  80
  81         //  printf("note: %d\n",note);
  82
  83         pevent->type = kVstMidiType;
  84         pevent->byteSize = 24;
  85         pevent->deltaFrames = 0;
  86         pevent->flags = 0;
  87         pevent->detune = 0;
  88         pevent->noteLength = 0;
  89         pevent->noteOffset = 0;
  90         pevent->reserved1 = 0;
  91         pevent->reserved2 = 0;
  92         pevent->noteOffVelocity = 0;
  93         pevent->midiData[0] = val1;
  94         pevent->midiData[1] = val2;
  95         pevent->midiData[2] = val3;
  96         pevent->midiData[3] = 0;
  97
  98         //printf("Sending: %x %x %x\n",val1,val2,val3);
  99
 100         jack_ringbuffer_write_advance (jvst->event_queue, sizeof (struct VstMidiEvent));
 101 }
 102
 103 void *midireceiver(void *arg)
 104 {
 105         snd_seq_event_t *event;
 106         JackVST *jvst = (JackVST* )arg;
 107         int val;
 108
 109         struct sched_param scp;
 110         scp.sched_priority = 50;
 111
 112         // Try to set fifo priority...
 113         // this works, if we are root or newe sched-cap manegment is used...
 114         pthread_setschedparam( pthread_self(), SCHED_FIFO, &scp );
 115
 116         while (1) {
 117
 118                 snd_seq_event_input (jvst->seq, &event);
 119
 120                 if (jvst->midiquit) {
 121                         break;
 122                 }
 123
 124                 switch(event->type){
 125                 case SND_SEQ_EVENT_NOTEON:
 126                         queue_midi(jvst,0x90+event->data.note.channel,event->data.note.note,event->data.note.velocity);
 127                         //printf("Noteon, channel: %d note: %d vol: %d\n",event->data.note.channel,event->data.note.note,event->data.note.velocity);
 128                         break;
 129                 case SND_SEQ_EVENT_NOTEOFF:
 130                         queue_midi(jvst,0x80+event->data.note.channel,event->data.note.note,0);
 131                         //printf("Noteoff, channel: %d note: %d vol: %d\n",event->data.note.channel,event->data.note.note,event->data.note.velocity);
 132                         break;
 133                 case SND_SEQ_EVENT_KEYPRESS:
 134                         //printf("Keypress, channel: %d note: %d vol: %d\n",event->data.note.channel,event->data.note.note,event->data.note.velocity);
 135                         queue_midi(jvst,0xa0+event->data.note.channel,event->data.note.note,event->data.note.velocity);
 136                         break;
 137                 case SND_SEQ_EVENT_CONTROLLER:
 138                         queue_midi(jvst,0xb0+event->data.control.channel,event->data.control.param,event->data.control.value);
 139                         //printf("Control: %d %d %d\n",event->data.control.channel,event->data.control.param,event->data.control.value);
 140                         break;
 141                 case SND_SEQ_EVENT_PITCHBEND:
 142                         val=event->data.control.value + 0x2000;
 143                         queue_midi(jvst,0xe0+event->data.control.channel,val&127,val>>7);
 144                         //printf("Pitch: %d %d %d\n",event->data.control.channel,event->data.control.param,event->data.control.value);
 145                         break;
 146                 case SND_SEQ_EVENT_CHANPRESS:
 147                         //printf("chanpress: %d %d %d\n",event->data.control.channel,event->data.control.param,event->data.control.value);
 148                         queue_midi(jvst,0xd0+event->data.control.channel,event->data.control.value,0);
 149                         break;
 150                 case SND_SEQ_EVENT_PGMCHANGE:
 151                         //printf("pgmchange: %d %d %d\n",event->data.control.channel,event->data.control.param,event->data.control.value);
 152                         queue_midi(jvst,0xc0+event->data.control.channel,event->data.control.value,0);
 153                         break;
 154                 default:
 155                         //printf("Unknown type: %d\n",event->type);
 156                         break;
 157                 }
 158         }
 159
 160         return NULL;
 161 }
 162
 163 void stop_midireceiver (JackVST *jvst)
 164 {
 165         int err;
 166         snd_seq_event_t event;
 167         snd_seq_t *seq2 = create_sequencer ("jfstquit", true);
 168
 169         jvst->midiquit = 1;
 170
 171         snd_seq_connect_to (seq2, 0, snd_seq_client_id (jvst->seq),0);
 172         snd_seq_ev_clear      (&event);
 173         snd_seq_ev_set_direct (&event);
 174         snd_seq_ev_set_subs   (&event);
 175         snd_seq_ev_set_source (&event, 0);
 176         snd_seq_ev_set_controller (&event,1,0x80,50);
 177
 178         if ((err = snd_seq_event_output (seq2, &event)) < 0) {
 179                 fst_error ("cannot send stop event to midi thread: %s\n",
 180                            snd_strerror (err));
 181         }
 182
 183         snd_seq_drain_output (seq2);
 184         snd_seq_close (seq2);
 185         pthread_join (jvst->midi_thread,NULL);
 186         snd_seq_close (jvst->seq);
 187 }
 188
 189
 190