path: root/pd/src/s_midi.c

/* Copyright (c) 1997-1999 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

/* Clock functions (which should move, but where?) and MIDI queueing */

#include "m_pd.h"
#include "s_stuff.h"
#include "m_imp.h"
#ifdef UNISTD
#include <unistd.h>
#include <sys/time.h>
#ifdef HAVE_BSTRING_H
#include <bstring.h>
#endif
#endif
#ifdef MSW
#include <winsock.h>
#include <sys/types.h>
#include <sys/timeb.h> 
#include <wtypes.h>
#endif
#include <string.h>
#include <stdio.h>
#include <signal.h>

typedef struct _midiqelem
{
    double q_time;
    int q_portno;
    unsigned char q_onebyte;
    unsigned char q_byte1;
    unsigned char q_byte2;
    unsigned char q_byte3;
} t_midiqelem;

#define MIDIQSIZE 1024

t_midiqelem midi_outqueue[MIDIQSIZE];
int midi_outhead, midi_outtail;
t_midiqelem midi_inqueue[MIDIQSIZE];
int midi_inhead, midi_intail;
static double sys_midiinittime;

int sys_midiapi = API_DEFAULT;

    /* this is our current estimate for at what "system" real time the
    current logical time's output should occur. */
static double sys_dactimeminusrealtime;
    /* same for input, should be schduler advance earlier. */
static double sys_adctimeminusrealtime;

static double sys_newdactimeminusrealtime = -1e20;
static double sys_newadctimeminusrealtime = -1e20;
static double sys_whenupdate;

void sys_initmidiqueue( void)
{
    sys_midiinittime = clock_getlogicaltime();
    sys_dactimeminusrealtime = sys_adctimeminusrealtime = 0;
}

    /* this is called from the OS dependent code from time to time when we
    think we know the delay (outbuftime) in seconds, at which the last-output
    audio sample will go out the door. */
void sys_setmiditimediff(double inbuftime, double outbuftime)
{
    double dactimeminusrealtime =
        .001 * clock_gettimesince(sys_midiinittime)
            - outbuftime - sys_getrealtime();
    double adctimeminusrealtime =
        .001 * clock_gettimesince(sys_midiinittime)
            + inbuftime - sys_getrealtime();
    if (dactimeminusrealtime > sys_newdactimeminusrealtime)
        sys_newdactimeminusrealtime = dactimeminusrealtime;
    if (adctimeminusrealtime > sys_newadctimeminusrealtime)
        sys_newadctimeminusrealtime = adctimeminusrealtime;
    if (sys_getrealtime() > sys_whenupdate)
    {
        sys_dactimeminusrealtime = sys_newdactimeminusrealtime;
        sys_adctimeminusrealtime = sys_newadctimeminusrealtime;
        sys_newdactimeminusrealtime = -1e20;
        sys_newadctimeminusrealtime = -1e20;
        sys_whenupdate = sys_getrealtime() + 1;
    }
}

    /* return the logical time of the DAC sample we believe is currently
    going out, based on how much "system time" has elapsed since the
    last time sys_setmiditimediff got called. */
static double sys_getmidioutrealtime( void)
{
    return (sys_getrealtime() + sys_dactimeminusrealtime);
}

static double sys_getmidiinrealtime( void)
{
    return (sys_getrealtime() + sys_adctimeminusrealtime);
}

static void sys_putnext( void)
{
    int portno = midi_outqueue[midi_outtail].q_portno;
#ifdef USEAPI_ALSA
    if (sys_midiapi == API_ALSA)
      {
        if (midi_outqueue[midi_outtail].q_onebyte)
          sys_alsa_putmidibyte(portno, midi_outqueue[midi_outtail].q_byte1);
        else sys_alsa_putmidimess(portno, midi_outqueue[midi_outtail].q_byte1,
                             midi_outqueue[midi_outtail].q_byte2,
                             midi_outqueue[midi_outtail].q_byte3);
      }
    else
#endif /* ALSA */
      {
        if (midi_outqueue[midi_outtail].q_onebyte)
          sys_putmidibyte(portno, midi_outqueue[midi_outtail].q_byte1);
        else sys_putmidimess(portno, midi_outqueue[midi_outtail].q_byte1,
                             midi_outqueue[midi_outtail].q_byte2,
                             midi_outqueue[midi_outtail].q_byte3);
      }
    midi_outtail  = (midi_outtail + 1 == MIDIQSIZE ? 0 : midi_outtail + 1);
}

/*  #define TEST_DEJITTER */

void sys_pollmidioutqueue( void)
{
#ifdef TEST_DEJITTER
    static int db = 0;
#endif
    double midirealtime = sys_getmidioutrealtime();
#ifdef TEST_DEJITTER
    if (midi_outhead == midi_outtail)
        db = 0;
#endif
    while (midi_outhead != midi_outtail)
    {
#ifdef TEST_DEJITTER
        if (!db)
        {
            post("out: del %f, midiRT %f logicaltime %f, RT %f dacminusRT %f",
                (midi_outqueue[midi_outtail].q_time - midirealtime),
                    midirealtime, .001 * clock_gettimesince(sys_midiinittime),
                        sys_getrealtime(), sys_dactimeminusrealtime);
            db = 1;
        }
#endif
        if (midi_outqueue[midi_outtail].q_time <= midirealtime)
            sys_putnext();
        else break;
    }
}

static void sys_queuemidimess(int portno, int onebyte, int a, int b, int c)
{
    t_midiqelem *midiqelem;
    int newhead = midi_outhead +1;
    if (newhead == MIDIQSIZE)
        newhead = 0;
            /* if FIFO is full flush an element to make room */
    if (newhead == midi_outtail)
        sys_putnext();
    midi_outqueue[midi_outhead].q_portno = portno;
    midi_outqueue[midi_outhead].q_onebyte = onebyte;
    midi_outqueue[midi_outhead].q_byte1 = a;
    midi_outqueue[midi_outhead].q_byte2 = b;
    midi_outqueue[midi_outhead].q_byte3 = c;
    midi_outqueue[midi_outhead].q_time =
        .001 * clock_gettimesince(sys_midiinittime);
    midi_outhead = newhead;
    sys_pollmidioutqueue();
}

#define MIDI_NOTEON 144
#define MIDI_POLYAFTERTOUCH 160
#define MIDI_CONTROLCHANGE 176
#define MIDI_PROGRAMCHANGE 192
#define MIDI_AFTERTOUCH 208
#define MIDI_PITCHBEND 224

void outmidi_noteon(int portno, int channel, int pitch, int velo)
{
    if (pitch < 0) pitch = 0;
    else if (pitch > 127) pitch = 127;
    if (velo < 0) velo = 0;
    else if (velo > 127) velo = 127;
    sys_queuemidimess(portno, 0, MIDI_NOTEON + (channel & 0xf), pitch, velo);
}

void outmidi_controlchange(int portno, int channel, int ctl, int value)
{
    if (ctl < 0) ctl = 0;
    else if (ctl > 127) ctl = 127;
    if (value < 0) value = 0;
    else if (value > 127) value = 127;
    sys_queuemidimess(portno, 0, MIDI_CONTROLCHANGE + (channel & 0xf),
        ctl, value);
}

void outmidi_programchange(int portno, int channel, int value)
{
    if (value < 0) value = 0;
    else if (value > 127) value = 127;
    sys_queuemidimess(portno, 0,
        MIDI_PROGRAMCHANGE + (channel & 0xf), value, 0);
}

void outmidi_pitchbend(int portno, int channel, int value)
{
    if (value < 0) value = 0;
    else if (value > 16383) value = 16383;
    sys_queuemidimess(portno, 0, MIDI_PITCHBEND + (channel & 0xf),
        (value & 127), ((value>>7) & 127));
}

void outmidi_aftertouch(int portno, int channel, int value)
{
    if (value < 0) value = 0;
    else if (value > 127) value = 127;
    sys_queuemidimess(portno, 0, MIDI_AFTERTOUCH + (channel & 0xf), value, 0);
}

void outmidi_polyaftertouch(int portno, int channel, int pitch, int value)
{
    if (pitch < 0) pitch = 0;
    else if (pitch > 127) pitch = 127;
    if (value < 0) value = 0;
    else if (value > 127) value = 127;
    sys_queuemidimess(portno, 0, MIDI_POLYAFTERTOUCH + (channel & 0xf),
        pitch, value);
}

void outmidi_mclk(int portno)
{
   sys_queuemidimess(portno, 1, 0xf8, 0,0);
}

void outmidi_byte(int portno, int value)
{
#ifdef USEAPI_ALSA
  if (sys_midiapi == API_ALSA)
    {
      sys_alsa_putmidibyte(portno, value);
    }
  else
#endif
    {
      sys_putmidibyte(portno, value);
    }
}

/* ------------------------- MIDI input queue handling ------------------ */
typedef struct midiparser
{
    int mp_status;
    int mp_gotbyte1;
    int mp_byte1;
} t_midiparser;

#define MIDINOTEOFF       0x80  /* 2 following 'data bytes' */
#define MIDINOTEON        0x90  /* 2 */
#define MIDIPOLYTOUCH     0xa0  /* 2 */
#define MIDICONTROLCHANGE 0xb0  /* 2 */
#define MIDIPROGRAMCHANGE 0xc0  /* 1 */
#define MIDICHANNELTOUCH  0xd0  /* 1 */
#define MIDIPITCHBEND     0xe0  /* 2 */
#define MIDISTARTSYSEX    0xf0  /* (until F7) */
#define MIDITIMECODE      0xf1  /* 1 */
#define MIDISONGPOS       0xf2  /* 2 */
#define MIDISONGSELECT    0xf3  /* 1 */
#define MIDIRESERVED1     0xf4  /* ? */
#define MIDIRESERVED2     0xf5  /* ? */
#define MIDITUNEREQUEST   0xf6  /* 0 */
#define MIDIENDSYSEX      0xf7  /* 0 */
#define MIDICLOCK         0xf8  /* 0 */
#define MIDITICK          0xf9  /* 0 */
#define MIDISTART         0xfa  /* 0 */
#define MIDICONT          0xfb  /* 0 */
#define MIDISTOP          0xfc  /* 0 */
#define MIDIACTIVESENSE   0xfe  /* 0 */
#define MIDIRESET         0xff  /* 0 */

    /* functions in x_midi.c */
void inmidi_realtimein(int portno, int cmd);
void inmidi_byte(int portno, int byte);
void inmidi_sysex(int portno, int byte);
void inmidi_noteon(int portno, int channel, int pitch, int velo);
void inmidi_controlchange(int portno, int channel, int ctlnumber, int value);
void inmidi_programchange(int portno, int channel, int value);
void inmidi_pitchbend(int portno, int channel, int value);
void inmidi_aftertouch(int portno, int channel, int value);
void inmidi_polyaftertouch(int portno, int channel, int pitch, int value);

static void sys_dispatchnextmidiin( void)
{
    static t_midiparser parser[MAXMIDIINDEV], *parserp;
    int portno = midi_inqueue[midi_intail].q_portno,
        byte = midi_inqueue[midi_intail].q_byte1;
    if (!midi_inqueue[midi_intail].q_onebyte)
        bug("sys_dispatchnextmidiin");
    if (portno < 0 || portno >= MAXMIDIINDEV)
        bug("sys_dispatchnextmidiin 2");
    parserp = parser + portno;
    outlet_setstacklim();
    
    if (byte >= 0xf8)
        inmidi_realtimein(portno, byte);
    else
    {
        inmidi_byte(portno, byte);
        if (byte & 0x80)
        {
            if (byte == MIDITUNEREQUEST || byte == MIDIRESERVED1 ||
                byte == MIDIRESERVED2)
                    parserp->mp_status = 0;
            else if (byte == MIDISTARTSYSEX)
            {
                inmidi_sysex(portno, byte);
                parserp->mp_status = byte;
            }
            else if (byte == MIDIENDSYSEX)
            {
                inmidi_sysex(portno, byte);
                parserp->mp_status = 0;
            }
            else
            {
                parserp->mp_status = byte;
            }
            parserp->mp_gotbyte1 = 0;
        }
        else
        {
            int cmd = (parserp->mp_status >= 0xf0 ? parserp->mp_status :
                (parserp->mp_status & 0xf0));
            int chan = (parserp->mp_status & 0xf);
            int byte1 = parserp->mp_byte1, gotbyte1 = parserp->mp_gotbyte1;
            switch (cmd)
            {
            case MIDINOTEOFF:
                if (gotbyte1)
                    inmidi_noteon(portno, chan, byte1, 0),
                        parserp->mp_gotbyte1 = 0;
                else parserp->mp_byte1 = byte, parserp->mp_gotbyte1 = 1;
                break;
            case MIDINOTEON:
                if (gotbyte1)
                    inmidi_noteon(portno, chan, byte1, byte),
                        parserp->mp_gotbyte1 = 0;
                else parserp->mp_byte1 = byte, parserp->mp_gotbyte1 = 1;
                break;
            case MIDIPOLYTOUCH:
                if (gotbyte1)
                    inmidi_polyaftertouch(portno, chan, byte1, byte),
                        parserp->mp_gotbyte1 = 0;
                else parserp->mp_byte1 = byte, parserp->mp_gotbyte1 = 1;
                break;
            case MIDICONTROLCHANGE:
                if (gotbyte1)
                    inmidi_controlchange(portno, chan, byte1, byte),
                        parserp->mp_gotbyte1 = 0;
                else parserp->mp_byte1 = byte, parserp->mp_gotbyte1 = 1;
                break;
            case MIDIPROGRAMCHANGE:
                inmidi_programchange(portno, chan, byte);
                break;
            case MIDICHANNELTOUCH:
                inmidi_aftertouch(portno, chan, byte);
                break;
            case MIDIPITCHBEND:
                if (gotbyte1)
                    inmidi_pitchbend(portno, chan, ((byte << 7) + byte1)),
                        parserp->mp_gotbyte1 = 0;
                else parserp->mp_byte1 = byte, parserp->mp_gotbyte1 = 1;
                break;
            case MIDISTARTSYSEX:
                inmidi_sysex(portno, byte);
                break;
                
                /* other kinds of messages are just dropped here.  We'll
                need another status byte before we start letting MIDI in
                again (no running status across "system" messages). */
            case MIDITIMECODE:     /* 1 data byte*/
                break;
            case MIDISONGPOS:       /* 2 */
                break;
            case MIDISONGSELECT:    /* 1 */
                break;
            }
        }
    }  
    midi_intail  = (midi_intail + 1 == MIDIQSIZE ? 0 : midi_intail + 1);
}

void sys_pollmidiinqueue( void)
{
#ifdef TEST_DEJITTER
    static int db = 0;
#endif
    double logicaltime = .001 * clock_gettimesince(sys_midiinittime);
#ifdef TEST_DEJITTER
    if (midi_inhead == midi_intail)
        db = 0;
#endif
    while (midi_inhead != midi_intail)
    {
#ifdef TEST_DEJITTER
        if (!db)
        {
            post("in del %f, logicaltime %f, RT %f adcminusRT %f",
                (midi_inqueue[midi_intail].q_time - logicaltime),
                    logicaltime, sys_getrealtime(), sys_adctimeminusrealtime);
            db = 1;
        }
#endif
#if 0
        if (midi_inqueue[midi_intail].q_time <= logicaltime - 0.007)
            post("late %f",
                1000 * (logicaltime - midi_inqueue[midi_intail].q_time));
#endif
        if (midi_inqueue[midi_intail].q_time <= logicaltime)
        {
#if 0
            post("diff %f",
                1000* (logicaltime - midi_inqueue[midi_intail].q_time));
#endif
            sys_dispatchnextmidiin();
        }
        else break;
    }
}

    /* this should be called from the system dependent MIDI code when a byte
    comes in, as a result of our calling sys_poll_midi.  We stick it on a
    timetag queue and dispatch it at the appropriate logical time. */


void sys_midibytein(int portno, int byte)
{
    static int warned = 0;
    t_midiqelem *midiqelem;
    int newhead = midi_inhead +1;
    if (newhead == MIDIQSIZE)
        newhead = 0;
            /* if FIFO is full flush an element to make room */
    if (newhead == midi_intail)
    {
        if (!warned)
        {
            post("warning: MIDI timing FIFO overflowed");
            warned = 1;
        }
        sys_dispatchnextmidiin();
    }
    midi_inqueue[midi_inhead].q_portno = portno;
    midi_inqueue[midi_inhead].q_onebyte = 1;
    midi_inqueue[midi_inhead].q_byte1 = byte;
    midi_inqueue[midi_inhead].q_time = sys_getmidiinrealtime();
    midi_inhead = newhead;
    sys_pollmidiinqueue();
}

void sys_pollmidiqueue( void)
{
#if 0
    static double lasttime;
    double newtime = sys_getrealtime();
    if (newtime - lasttime > 0.007)
        post("delay %d", (int)(1000 * (newtime - lasttime)));
    lasttime = newtime;
#endif
#ifdef USEAPI_ALSA
      if (sys_midiapi == API_ALSA)
        sys_alsa_poll_midi();
      else
#endif /* ALSA */
    sys_poll_midi();    /* OS dependent poll for MIDI input */
    sys_pollmidioutqueue();
    sys_pollmidiinqueue();
}

/******************** dialog window and device listing ********************/

#ifdef USEAPI_ALSA
void midi_alsa_init( void);
#endif
#ifdef USEAPI_OSS
void midi_oss_init( void);
#endif

    /* last requested parameters */
static int midi_nmidiindev;
static int midi_midiindev[MAXMIDIINDEV];
static int midi_nmidioutdev;
static int midi_midioutdev[MAXMIDIOUTDEV];


void sys_get_midi_apis(char *buf)
{
    int n = 0;
    strcpy(buf, "{ ");
    sprintf(buf + strlen(buf), "{default-MIDI %d} ", API_DEFAULT); n++;
#ifdef USEAPI_ALSA
    sprintf(buf + strlen(buf), "{ALSA-MIDI %d} ", API_ALSA); n++;
#endif
    strcat(buf, "}");
        /* then again, if only one API (or none) we don't offer any choice. */
    if (n < 2)
        strcpy(buf, "{}");
    
}
void sys_get_midi_params(int *pnmidiindev, int *pmidiindev,
    int *pnmidioutdev, int *pmidioutdev)
{
    int i;
    *pnmidiindev = midi_nmidiindev;
    for (i = 0; i < MAXMIDIINDEV; i++)
        pmidiindev[i] = midi_midiindev[i]; 
    *pnmidioutdev = midi_nmidioutdev;
    for (i = 0; i < MAXMIDIOUTDEV; i++)
        pmidioutdev[i] = midi_midioutdev[i]; 
}

static void sys_save_midi_params(
    int nmidiindev, int *midiindev,
    int nmidioutdev, int *midioutdev)
{
    int i;
    midi_nmidiindev = nmidiindev;
    for (i = 0; i < MAXMIDIINDEV; i++)
        midi_midiindev[i] = midiindev[i]; 
    midi_nmidioutdev = nmidioutdev;
    for (i = 0; i < MAXMIDIOUTDEV; i++)
        midi_midioutdev[i] = midioutdev[i]; 
}

void sys_open_midi(int nmidiindev, int *midiindev,
    int nmidioutdev, int *midioutdev, int enable)
{
#ifdef USEAPI_ALSA
  midi_alsa_init();
#endif
#ifdef USEAPI_OSS
    midi_oss_init();
#endif
    if (enable)
#ifdef USEAPI_ALSA
      if (sys_midiapi == API_ALSA)
        sys_alsa_do_open_midi(nmidiindev, midiindev, nmidioutdev, midioutdev);
      else
#endif /* ALSA */
        sys_do_open_midi(nmidiindev, midiindev, nmidioutdev, midioutdev);
    sys_save_midi_params(nmidiindev, midiindev,
        nmidioutdev, midioutdev);

    sys_vgui("set pd_whichmidiapi %d\n", sys_midiapi);

}

    /* open midi using whatever parameters were last used */
void sys_reopen_midi( void)
{
    int nmidiindev, midiindev[MAXMIDIINDEV];
    int nmidioutdev, midioutdev[MAXMIDIOUTDEV];
    sys_get_midi_params(&nmidiindev, midiindev, &nmidioutdev, midioutdev);
    sys_open_midi(nmidiindev, midiindev, nmidioutdev, midioutdev, 1);
}

#define MAXNDEV 20
#define DEVDESCSIZE 80

#define DEVONSET 1  /* To agree with command line flags, normally start at 1 */

void sys_listmididevs(void )
{
    char indevlist[MAXNDEV*DEVDESCSIZE], outdevlist[MAXNDEV*DEVDESCSIZE];
    int nindevs = 0, noutdevs = 0, i;

#ifdef USEAPI_ALSA
    if (sys_midiapi == API_ALSA)
      midi_alsa_getdevs(indevlist, &nindevs, outdevlist, &noutdevs,
        MAXNDEV, DEVDESCSIZE);
    else
#endif /* ALSA */
    midi_getdevs(indevlist, &nindevs, outdevlist, &noutdevs,
        MAXNDEV, DEVDESCSIZE);

    if (!nindevs)
        post("no midi input devices found");
    else
    {
        post("MIDI input devices:");
        for (i = 0; i < nindevs; i++)
            post("%d. %s", i+1, indevlist + i * DEVDESCSIZE);
    }
    if (!noutdevs)
        post("no midi output devices found");
    else
    {
        post("MIDI output devices:");
        for (i = 0; i < noutdevs; i++)
            post("%d. %s", i+DEVONSET, outdevlist + i * DEVDESCSIZE);
    }
}

void sys_set_midi_api(int which)
{
     sys_midiapi = which;
     if (sys_verbose)
        post("sys_midiapi %d", sys_midiapi);
}

void glob_midi_properties(t_pd *dummy, t_floatarg flongform);

void glob_midi_setapi(void *dummy, t_floatarg f)
{
    int newapi = f;
    if (newapi)
    {
        if (newapi == sys_midiapi)
        {
          //if (!midi_isopen())
          //  s_reopen_midi();
        }
        else
        {
#ifdef USEAPI_ALSA
          if (sys_midiapi == API_ALSA)
              sys_alsa_close_midi();
          else
#endif
            sys_close_midi();
          sys_midiapi = newapi;
          /* bash device params back to default */
          midi_nmidiindev = midi_nmidioutdev = 1;
          //midi_midiindev[0] = midi_midioutdev[0] = DEFAULTMIDIDEV;
          //midi_midichindev[0] = midi_midichoutdev[0] = SYS_DEFAULTCH;
          sys_reopen_midi();
        }

        glob_midi_properties(0, 0);
    }
    else //if (midi_isopen())
    {
        sys_close_midi();
        //midi_state = 0;
    }
}

extern t_class *glob_pdobject;

    /* start an midi settings dialog window */
void glob_midi_properties(t_pd *dummy, t_floatarg flongform)
{
    char buf[1024 + 2 * MAXNDEV*(DEVDESCSIZE+4)];
        /* these are the devices you're using: */
    int nindev, midiindev[MAXMIDIINDEV];
    int noutdev, midioutdev[MAXMIDIOUTDEV];
    int midiindev1, midiindev2, midiindev3, midiindev4,
        midioutdev1, midioutdev2, midioutdev3, midioutdev4;

        /* these are all the devices on your system: */
    char indevlist[MAXNDEV*DEVDESCSIZE], outdevlist[MAXNDEV*DEVDESCSIZE];
    int nindevs = 0, noutdevs = 0, i;

    midi_getdevs(indevlist, &nindevs, outdevlist, &noutdevs,
        MAXNDEV, DEVDESCSIZE);

    sys_gui("global midi_indevlist; set midi_indevlist {none}\n");
    for (i = 0; i < nindevs; i++)
        sys_vgui("lappend midi_indevlist {%s}\n",
            indevlist + i * DEVDESCSIZE);

    sys_gui("global midi_outdevlist; set midi_outdevlist {none}\n");
    for (i = 0; i < noutdevs; i++)
        sys_vgui("lappend midi_outdevlist {%s}\n",
            outdevlist + i * DEVDESCSIZE);

    sys_get_midi_params(&nindev, midiindev, &noutdev, midioutdev);

    if (nindev > 1 || noutdev > 1)
        flongform = 1;

    midiindev1 = (nindev > 0 &&  midiindev[0]>= 0 ? midiindev[0]+1 : 0);
    midiindev2 = (nindev > 1 &&  midiindev[1]>= 0 ? midiindev[1]+1 : 0);
    midiindev3 = (nindev > 2 &&  midiindev[2]>= 0 ? midiindev[2]+1 : 0);
    midiindev4 = (nindev > 3 &&  midiindev[3]>= 0 ? midiindev[3]+1 : 0);
    midioutdev1 = (noutdev > 0 && midioutdev[0]>=0 ? midioutdev[0]+1 : 0);  
    midioutdev2 = (noutdev > 1 && midioutdev[1]>=0 ? midioutdev[1]+1 : 0);  
    midioutdev3 = (noutdev > 2 && midioutdev[2]>=0 ? midioutdev[2]+1 : 0);  
    midioutdev4 = (noutdev > 3 && midioutdev[3]>=0 ? midioutdev[3]+1 : 0);  

#ifdef USEAPI_ALSA
      if (sys_midiapi == API_ALSA)
    sprintf(buf,
"pdtk_alsa_midi_dialog %%s \
%d %d %d %d %d %d %d %d \
%d 1\n",
        midiindev1, midiindev2, midiindev3, midiindev4, 
        midioutdev1, midioutdev2, midioutdev3, midioutdev4,
        (flongform != 0));
      else
#endif
    sprintf(buf,
"pdtk_midi_dialog %%s \
%d %d %d %d %d %d %d %d \
%d\n",
        midiindev1, midiindev2, midiindev3, midiindev4, 
        midioutdev1, midioutdev2, midioutdev3, midioutdev4,
        (flongform != 0));

    gfxstub_deleteforkey(0);
    gfxstub_new(&glob_pdobject, (void *)glob_midi_properties, buf);
}

    /* new values from dialog window */
void glob_midi_dialog(t_pd *dummy, t_symbol *s, int argc, t_atom *argv)
{
    int nmidiindev, midiindev[MAXMIDIINDEV];
    int nmidioutdev, midioutdev[MAXMIDIOUTDEV];
    int i, nindev, noutdev;
    int newmidiindev[4], newmidioutdev[4];
    int alsadevin, alsadevout;

    for (i = 0; i < 4; i++)
    {
        newmidiindev[i] = atom_getintarg(i, argc, argv);
        newmidioutdev[i] = atom_getintarg(i+4, argc, argv);
    }

    for (i = 0, nindev = 0; i < 4; i++)
    {
        if (newmidiindev[i] > 0)
        {
            newmidiindev[nindev] = newmidiindev[i]-1;
            nindev++;
        }
    }
    for (i = 0, noutdev = 0; i < 4; i++)
    {
        if (newmidioutdev[i] > 0)
        {
            newmidioutdev[noutdev] = newmidioutdev[i]-1;
            noutdev++;
        }
    }
    alsadevin = atom_getintarg(8, argc, argv);
    alsadevout = atom_getintarg(9, argc, argv);
        
#ifdef USEAPI_ALSA
    if (sys_midiapi == API_ALSA)
      {
        sys_alsa_close_midi();
        sys_open_midi(alsadevin, newmidiindev, alsadevout, newmidioutdev, 1);
      }
    else
#endif
      {
        sys_close_midi();
        sys_open_midi(nindev, newmidiindev, noutdev, newmidioutdev, 1);
      }

}