plugins/libmidiclock.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 <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28
  29 #include <linux/joystick.h>
  30
  31 #include <gdk/gdk.h>
  32 #include <gtk/gtk.h>
  33
  34 #include "global.h"
  35 #include "generator.h"
  36 #include "comp.h"
  37 #include "control.h"
  38 #include "gencomp.h"
  39 #include "msgbox.h"
  40
  41 #define GENERATOR_CLASS_NAME    "midiclock"
  42 #define GENERATOR_CLASS_PATH    "Misc/MIDI Clock"
  43
  44
  45
  46 /*
  47  * Here is the Data....
  48  *
  49  */
  50
  51 enum EVT_INPUTS {
  52     NUM_EVENT_INPUTS = 0
  53 };
  54
  55 enum EVT_OUTPUTS {
  56     EVT_CLOCK = 0,
  57     EVT_START,
  58     NUM_EVENT_OUTPUTS
  59 };
  60
  61 typedef struct Data {
  62   gint fd;
  63   gint input_tag;
  64 } Data;
  65
  66
  67 /*
  68  * This is the input callback....
  69  * Seems to bo ok for now..
  70  *
  71  * now with the buttons its ok...
  72  * (??? Is sending the number ok with evtcomp)
  73  *
  74  */
  75
  76
  77 PRIVATE void input_callback( Generator *g, gint source, GdkInputCondition condition ) {
  78
  79   unsigned char midibyte;
  80   AEvent event;
  81
  82   read( source, &midibyte, 1 );
  83
  84   if( midibyte == 0xf8 ) {
  85
  86       gen_init_aevent(&event, AE_NUMBER, NULL, 0, NULL, 0, gen_get_sampletime() );
  87       event.d.number = 1;
  88       gen_send_events(g, EVT_CLOCK, -1, &event);
  89   }
  90   if( midibyte == 0xfa ) {
  91
  92       gen_init_aevent(&event, AE_NUMBER, NULL, 0, NULL, 0, gen_get_sampletime() );
  93       event.d.number = 1;
  94       gen_send_events(g, EVT_START, -1, &event);
  95   }
  96 }
  97
  98
  99
 100 /*
 101  * Constuctor and Destructor
 102  *
 103  * I have to add a global-property to get /dev/input/js0 from config.
 104  * Of course make it configurable in plugin-properties.
 105  *
 106  * then i need asserts... But hey it works now :-)
 107  * Instance can be added even if configured for js1 and only js0
 108  * available (??? confusing having non working component  )
 109  *
 110  */
 111
 112 PRIVATE int init_instance(Generator *g) {
 113   Data *data = safe_malloc(sizeof(Data));
 114   g->data = data;
 115
 116   data->fd = open( "/dev/midi00", O_RDONLY | O_NONBLOCK );
 117   data->input_tag = gdk_input_add( data->fd, GDK_INPUT_READ, (GdkInputFunction)  input_callback, (gpointer) g );
 118   return 1;
 119 }
 120
 121 PRIVATE void destroy_instance(Generator *g) {
 122   Data *data = g->data;
 123
 124   gdk_input_remove( data->input_tag );
 125   close( data->fd );
 126
 127   free(g->data);
 128 }
 129
 130
 131 /*
 132  * pickle and unpickle
 133  *
 134  * are straight forward....
 135  *
 136  */
 137
 138 PRIVATE void unpickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
 139   Data *data = safe_malloc(sizeof(Data));
 140   g->data = data;
 141
 142   data->fd = open( "/dev/midi00", O_RDONLY );
 143   data->input_tag = gdk_input_add( data->fd, GDK_INPUT_READ, (GdkInputFunction) input_callback, g );
 144 }
 145
 146 PRIVATE void pickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
 147   //Data *data = g->data;
 148 }
 149
 150 /*
 151  * controls....
 152  *
 153  * Shall there ever be controls ???
 154  * i am a control :-)
 155  *
 156  */
 157
 158 PRIVATE ControlDescriptor controls[] = {
 159   /* { kind, name, min,max,step,page, size,editable, is_dst,queue_number,
 160        init,destroy,refresh,refresh_data }, */
 161      { CONTROL_KIND_NONE, }
 162 };
 163
 164
 165 /*
 166  * setup Class
 167  *
 168  * much TODO here....
 169  *
 170  * check how many buttons and axes we have...
 171  * can i change this dynamicly ???
 172  *
 173  */
 174
 175 PRIVATE void setup_class(void) {
 176   GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE, NUM_EVENT_INPUTS, NUM_EVENT_OUTPUTS,
 177                                              NULL, NULL, controls,
 178                                              init_instance, destroy_instance,
 179                                              unpickle_instance, pickle_instance);
 180
 181   gen_configure_event_output(k, EVT_CLOCK,   "Clock");
 182   gen_configure_event_output(k, EVT_START,   "Start");
 183   gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH, NULL, NULL);
 184 }
 185
 186 PUBLIC void init_plugin(void) {
 187   setup_class();
 188 }
 189
 190