plugins/libmidievt_note_decode.c

   1 /* gAlan - Graphical Audio Language
   2  * Copyright (C) 1999 Tony Garnock-Jones
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <stddef.h>
  23
  24 #include <gdk/gdk.h>
  25 #include <gtk/gtk.h>
  26 #include <gmodule.h>
  27
  28 #include "global.h"
  29 #include "generator.h"
  30 #include "comp.h"
  31 #include "control.h"
  32 #include "gencomp.h"
  33
  34 #define GENERATOR_CLASS_NAME    "midievt_note_decode"
  35 #define GENERATOR_CLASS_PATH    "MIDI Events/Note Decoder"
  36
  37 #define EVT_MIDI_IN             0
  38 #define EVT_CHANNEL             1
  39 #define NUM_EVENT_INPUTS        2
  40
  41 #define EVT_NOTEON              0
  42 #define EVT_NOTEOFF             1
  43 #define EVT_NOTEVEL             2
  44 #define NUM_EVENT_OUTPUTS       3
  45
  46 typedef struct Data {
  47     int channel;
  48 } Data;
  49
  50 PRIVATE int init_instance(Generator *g) {
  51   Data *data = safe_malloc(sizeof(Data));
  52   g->data = data;
  53
  54   data->channel = 0;
  55
  56   return 1;
  57 }
  58
  59 PRIVATE void destroy_instance(Generator *g) {
  60   free(g->data);
  61 }
  62
  63 PRIVATE void unpickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
  64   Data *data = safe_malloc(sizeof(Data));
  65
  66   g->data = data;
  67
  68   data->channel = objectstore_item_get_double(item, "channel", 0);
  69 }
  70
  71 PRIVATE void pickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
  72   Data *data = g->data;
  73
  74   objectstore_item_set_double(item, "channel", data->channel);
  75 }
  76
  77 PRIVATE void evt_midi_handler(Generator *g, AEvent *event) {
  78     Data *data = g->data;
  79
  80     switch( event->kind ) {
  81         case AE_MIDIEVENT:
  82             if( (event->d.midiev.midistring[0] & 0xf0) == 0x90 ) {
  83                 int note = event->d.midiev.midistring[1];
  84                 int channel = event->d.midiev.midistring[0] & 0x0f;
  85                 int vel  = (double)event->d.midiev.midistring[2];
  86
  87                 if( channel == data->channel ) {
  88                     event->kind = AE_NUMBER;
  89                     event->d.number = note;
  90                     gen_send_events( g, EVT_NOTEON , -1, event );
  91                     event->d.number = vel;
  92                     gen_send_events( g, EVT_NOTEVEL , -1, event );
  93                 }
  94             }
  95
  96             if( (event->d.midiev.midistring[0] & 0xf0) == 0x80 ) {
  97                 int note = event->d.midiev.midistring[1];
  98                 int channel = event->d.midiev.midistring[0] & 0x0f;
  99                 int vel  = (double)event->d.midiev.midistring[2];
 100
 101                 if( channel == data->channel ) {
 102                     event->kind = AE_NUMBER;
 103                     event->d.number = note;
 104                     gen_send_events( g, EVT_NOTEOFF , -1, event );
 105                     event->d.number = vel;
 106                     gen_send_events( g, EVT_NOTEVEL , -1, event );
 107                 }
 108             }
 109             break;
 110         default:
 111             g_warning( "midi_note_demultiplex does not know this eventkind\n" );
 112             break;
 113     }
 114 }
 115
 116 PRIVATE void evt_channel_handler(Generator *g, AEvent *event) {
 117     Data *data = g->data;
 118     data->channel = event->d.number;
 119     gen_update_controls( g, -1 );
 120 }
 121
 122
 123 PRIVATE ControlDescriptor controls[] = {
 124     /* { kind, name, min,max,step,page, size,editable, is_dst,queue_number,
 125        init,destroy,refresh,refresh_data }, */
 126       { CONTROL_KIND_KNOB, "channel", 0,15,1,1, 0,TRUE, TRUE, EVT_CHANNEL,
 127         NULL,NULL, control_int32_updater, (gpointer) offsetof(Data, channel) },
 128     { CONTROL_KIND_NONE, }
 129 };
 130
 131 PRIVATE void setup_class(void) {
 132     GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE,
 133             NUM_EVENT_INPUTS, NUM_EVENT_OUTPUTS,
 134             NULL, NULL, controls,
 135             init_instance, destroy_instance,
 136             unpickle_instance, pickle_instance);
 137
 138     gen_configure_event_input(k, EVT_MIDI_IN, "midi-in", evt_midi_handler );
 139     gen_configure_event_input(k, EVT_CHANNEL, "channel", evt_channel_handler );
 140     gen_configure_event_output(k, EVT_NOTEON, "note-on");
 141     gen_configure_event_output(k, EVT_NOTEOFF, "note-off");
 142     gen_configure_event_output(k, EVT_NOTEVEL, "velocity");
 143
 144     gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH,
 145             NULL,
 146             NULL);
 147 }
 148
 149 PUBLIC void init_plugin(void) {
 150     setup_class();
 151 }