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#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <sys/asoundlib.h>
#include <string.h>
#include <signal.h>
static void usage(void)
{
fprintf(stderr, "Usage: midiloop [options]\n");
fprintf(stderr, " options:\n");
fprintf(stderr, " -v: verbose mode\n");
fprintf(stderr, " -i [ card-id device-id ] : test input device\n");
fprintf(stderr, " -o [ card-id device-id ] : test output device\n");
}
int stop = 0;
void sighandler(int dummy ATTRIBUTE_UNUSED)
{
stop=1;
}
long long timediff(struct timeval t1, struct timeval t2)
{
signed long l;
t1.tv_sec -= t2.tv_sec;
l = (signed long) t1.tv_usec - (signed long) t2.tv_usec;
if (l < 0) {
t1.tv_sec--;
l = -l;
l %= 1000000;
}
return ((long long)t1.tv_sec * (long long)1000000) + (long long)l;
}
int writepattern(snd_rawmidi_t *handle_out, unsigned char *obuf)
{
int patsize, i;
patsize = 0;
for (i = 0; i < 15; i++) {
obuf[patsize++] = 0x90 + i;
obuf[patsize++] = 0x40;
obuf[patsize++] = 0x3f;
obuf[patsize++] = 0xb0 + i;
obuf[patsize++] = 0x2e;
obuf[patsize++] = 0x7a;
obuf[patsize++] = 0x80 + i;
obuf[patsize++] = 0x23;
obuf[patsize++] = 0x24;
obuf[patsize++] = 0x25;
obuf[patsize++] = 0x26;
}
i = snd_rawmidi_write(handle_out, obuf, patsize);
if (i != patsize) {
printf("Written only %i bytes from %i bytes\n", i, patsize);
exit(EXIT_FAILURE);
}
return patsize;
}
int main(int argc, char** argv)
{
int i, j, k, opos, ipos, patsize;
int err;
int verbose = 0;
int card_in = -1, device_in = 0;
int card_out = -1, device_out = 0;
snd_rawmidi_t *handle_in = NULL, *handle_out = NULL;
unsigned char ibuf[512], obuf[512];
struct timeval start, end;
long long diff;
snd_rawmidi_status_t istat, ostat;
if (argc == 1) {
usage();
exit(EXIT_SUCCESS);
}
for (i = 1 ; i<argc ; i++) {
if (argv[i][0]=='-') {
switch (argv[i][1]) {
case 'h':
usage();
break;
case 'v':
verbose = 1;
break;
case 'i':
card_in = atoi(argv[i+1]);
if (isdigit(argv[i+2][0])) {
device_in = atoi(argv[i+2]);
} else {
fprintf(stderr,"Error: -i with card_id, but missing device id\n");
exit(-1);
}
i+=2;
break;
case 'o':
card_out = atoi(argv[i+1]);
if (isdigit(argv[i+2][0])) {
device_out = atoi(argv[i+2]);
}else{
fprintf(stderr,"Error: -i with card_id, but missing device id\n");
exit(EXIT_FAILURE);
}
break;
}
}
}
if (card_in == -1 && card_out == -1) {
fprintf(stderr, "specify at least one device\n");
exit(EXIT_FAILURE);
}
if (card_in == -1)
card_in = card_out;
if (card_out == -1)
card_out = card_in;
if (verbose) {
fprintf(stderr, "Using: \n");
fprintf(stderr, " Input: ");
fprintf(stderr, "card %d, device %d\n", card_in, device_in);
fprintf(stderr, " Output: ");
fprintf(stderr, "card %d, device %d\n", card_out, device_out);
}
err = snd_rawmidi_open(&handle_in, card_in, device_in, SND_RAWMIDI_OPEN_INPUT | SND_RAWMIDI_OPEN_NONBLOCK);
if (err) {
fprintf(stderr,"snd_rawmidi_open %d %d failed: %d\n",card_in,device_in,err);
exit(EXIT_FAILURE);
}
err = snd_rawmidi_open(&handle_out, card_out, device_out, SND_RAWMIDI_OPEN_OUTPUT);
if (err) {
fprintf(stderr,"snd_rawmidi_open %d %d failed: %d\n",card_out,device_out,err);
exit(EXIT_FAILURE);
}
signal(SIGINT, sighandler);
i = snd_rawmidi_read(handle_in, ibuf, sizeof(ibuf));
if (i > 0) {
printf("Read ahead: %i\n", i);
for (j = 0; j < i; j++)
printf("%02x:", ibuf[j]);
printf("\n");
exit(EXIT_FAILURE);
}
patsize = writepattern(handle_out, obuf);
gettimeofday(&start, NULL);
patsize = writepattern(handle_out, obuf);
k = ipos = opos = err = 0;
while (!stop) {
i = snd_rawmidi_read(handle_in, ibuf, sizeof(ibuf));
for (j = 0; j < i; j++, ipos++)
if (obuf[k] != ibuf[j]) {
printf("ipos = %i, i[0x%x] != o[0x%x]\n", ipos, ibuf[j], obuf[k]);
if (opos > 0)
stop = 1;
} else {
printf("match success: ipos = %i, opos = %i [%i:0x%x]\n", ipos, opos, k, obuf[k]);
k++; opos++;
if (k >= patsize) {
patsize = writepattern(handle_out, obuf);
k = 0;
}
}
}
gettimeofday(&end, NULL);
printf("End...\n");
bzero(&istat, sizeof(istat));
bzero(&ostat, sizeof(ostat));
istat.stream = SND_RAWMIDI_STREAM_INPUT;
ostat.stream = SND_RAWMIDI_STREAM_OUTPUT;
err = snd_rawmidi_stream_status(handle_in, &istat);
if (err < 0)
fprintf(stderr, "input stream status error: %d\n", err);
err = snd_rawmidi_stream_status(handle_out, &ostat);
if (err < 0)
fprintf(stderr, "output stream status error: %d\n", err);
printf("input.status.queue = %li\n", istat.queue);
printf("input.status.overrun = %li\n", istat.overrun);
printf("output.status.queue = %li\n", ostat.queue);
printf("output.status.overrun = %li\n", ostat.overrun);
diff = timediff(end, start);
printf("Time diff: %Liusec (%Li bytes/sec)\n", diff, ((long long)opos * 1000000) / diff);
if (verbose) {
fprintf(stderr,"Closing\n");
}
snd_rawmidi_input_drain(handle_in);
snd_rawmidi_close(handle_in);
snd_rawmidi_output_drain(handle_out);
snd_rawmidi_close(handle_out);
return 0;
}
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