linux/alsa/midi_pack.h

   1 /*
   2  * Copyright (c) 2006,2007 Dmitry S. Baikov
   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 #ifndef __jack_midi_pack_h__
  20 #define __jack_midi_pack_h__
  21
  22 typedef struct
  23 {
  24     int running_status;
  25 }
  26 midi_pack_t;
  27
  28 static inline
  29 void midi_pack_reset(midi_pack_t *p)
  30 {
  31     p->running_status = 0;
  32 }
  33
  34 static
  35 void midi_pack_event(midi_pack_t *p, jack_midi_event_t *e)
  36 {
  37     if (e->buffer[0] >= 0x80 && e->buffer[0] < 0xF0) { // Voice Message
  38         if (e->buffer[0] == p->running_status) {
  39             e->buffer++;
  40             e->size--;
  41         } else
  42             p->running_status = e->buffer[0];
  43     } else if (e->buffer[0] < 0xF8) { // not System Realtime
  44         p->running_status = 0;
  45     }
  46 }
  47
  48 #endif /* __jack_midi_pack_h__ */