* Re: example of sending note on/off to MIDI port (Timidity's virtual sequencer)
2005-10-20 23:17 ` Lee Revell
@ 2005-10-21 3:19 ` Brolin Empey
0 siblings, 0 replies; 3+ messages in thread
From: Brolin Empey @ 2005-10-21 3:19 UTC (permalink / raw)
To: alsa-devel
Lee Revell wrote:
> On Thu, 2005-10-20 at 14:05 -0700, Brolin Empey wrote:
>> Hello,
>>
>> I want to add ALSA support to a MIDI program I wrote (in C) which
>> currently supports only the Win32 API (using midiOutShortMsg). More
>> specifically, I want to do this using Timidity's virtual sequencer for
>> playback of the output MIDI messages. I can use playmidi (which uses
>> the OSS API) or pmidi (which uses ALSA's API) to play MIDI files using
>> Timidity's port (128:0). After studying both of these application's
>> sources, I tried without success to put together a minimal test program
>> to simply send a note on and subsequent note off message using
>> Timidity's port.
>>
>> Does anyone have a simple example of how to do this? It can use either
>> the OSS API (e.g. /dev/sequencer interface) or ALSA's library. I tried
>> the rawmidi example, but could not get it to play anything using
>> Timidity's port.
>
> You forgot to include a link to your code.
>
> Lee
I don't think this will be too helpful since I used a bunch of functions
from the pmidi source. I was asking if anyone had a working example
because I wanted something simple that worked and that I could build
upon. I was under the impression that what I wanted to do seemed to be
quite complex, especially compared to using the Win32 API to do the same
thing. This impression may be quite wrong though, since I haven't
studied the documentation too much and was hoping to just piece
something together from pmidi.
=======================================================================
#define HAVE_ALSA_ASOUNDLIB_H 1
#include "glib.h"
#include "elements.h"
#include "except.h"
#include "intl.h"
#include "seqlib.h"
#include "md.h"
#include "midi.h"
#include <alsa/asoundlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
int
main(int argc, char **argv)
{
static char optstring[] = "p:";
static struct option longopts[] = {
{ "port", required_argument, 0, 'p' },
{ 0, 0, 0, 0 },
};
int ex=0, ch=0, client=0, port=0, i=0, j=0, k=0, l=0;
char *cp;
//char n[3];
seq_context_t *ctxp;
snd_seq_event_t ev;
/*
for (i=0; i<sizeof(n)/sizeof(n[0]); i++)
{
n[i] = 0;
}
*/
//memset(n, 0, sizeof(n)/sizeof(n[0]));
while ( (ex == 0) && ( (ch = getopt_long(argc, argv, optstring,
longopts, NULL)) != EOF) )
{
switch (ch)
{
case 'p':
if (!optarg)
{
exit(1);
}
/*
cp = strchr(optarg, ':');
printf("optarg start = %d, : = %d\n", &optarg, &cp[0]);
printf("client = %s\n", cp);
*/
for (i=0; i<strlen(optarg); i++)
{
if (optarg[i] == ':')
{
j = i;
break;
}
}
// printf("':' at %d chars from start.\n", j);
if (j > 0)
{
cp = calloc(j+1, sizeof(optarg[0]));
for (i=0; i<j; i++)
{
cp[i] = optarg[i];
}
//printf("client (as string) = %s\n", cp);
client = atoi(cp);
//printf("client (as int) = %d\n", client);
free(cp);
k = strlen(optarg)-(j+1);
//printf("k = %d\n", k);
if (k>0)
{
cp = calloc(k, sizeof(optarg[0]));
//printf("strlen(optarg)-(j+1) = %d\n", strlen(optarg)-(j+1));
//printf("j = %d\n", j);
l = j+1;
for (i=0; i<k; i++)
{
//printf("i = %d\n", i);
cp[i] = optarg[l];
l++;
}
//printf("port (as string) = %s\n", cp);
port = atoi(cp);
//printf("port (as int) = %d\n", port);
free(cp);
}
}
break;
default:
ex = 1;
break;
}
}
if (ex)
{
return ex;
}
ctxp = seq_create_context();
if (seq_connect_add(ctxp, client, port) < 0)
{
fprintf(stderr, "Could not connect to port %d:%d\n", client, port);
return 1;
}
seq_midi_event_init(ctxp, &ev, 1000, 0);
seq_init_tempo(ctxp, 8, 120, 1);
seq_start_timer(ctxp);
seq_midi_program(ctxp, &ev, 0, 0);
seq_midi_note(ctxp, &ev, 0, 60, 127, 1000);
sleep(5);
seq_free_context(ctxp);
return ex;
}
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