ALSA project - the C library reference: /test/rawmidi.c

ALSA project - the C library reference

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/test/rawmidi.c

Shows open and read/write rawmidi operations.

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "../include/asoundlib.h"
#include <signal.h>
static void usage(void)
{
fprintf(stderr, "usage: rawmidi [options]\n");
fprintf(stderr, " options:\n");
fprintf(stderr, " -v: verbose mode\n");
fprintf(stderr, " -i device-id : test ALSA input device\n");
fprintf(stderr, " -o device-id : test ALSA output device\n");
fprintf(stderr, " -I node : test input node\n");
fprintf(stderr, " -O node : test output node\n");
fprintf(stderr, " -c clock : kernel clock type (0=none, 1=realtime, 2=monotonic, 3=monotonic raw)\n");
fprintf(stderr, " -t: test midi thru\n");
fprintf(stderr, " example:\n");
fprintf(stderr, " rawmidi -i hw:0,0 -O /dev/midi1\n");
fprintf(stderr, " tests input for card 0, device 0, using snd_rawmidi API\n");
fprintf(stderr, " and /dev/midi1 using file descriptors\n");
}
int stop=0;
void sighandler(int dum)
{
stop=1;
}
int main(int argc,char** argv)
{
int i;
int err;
int thru=0;
int verbose = 0;
char *device_in = NULL;
char *device_out = NULL;
char *node_in = NULL;
char *node_out = NULL;
int clock_type = -1;
int fd_in = -1,fd_out = -1;
snd_rawmidi_t *handle_in = 0,*handle_out = 0;
if (argc==1) {
usage();
exit(0);
}
for (i = 1 ; i<argc ; i++) {
if (argv[i][0]=='-') {
switch (argv[i][1]) {
case 'h':
usage();
break;
case 'v':
verbose = 1;
break;
case 't':
thru = 1;
break;
case 'c':
if (i + 1 < argc)
clock_type = atoi(argv[++i]);
break;
case 'i':
if (i + 1 < argc)
device_in = argv[++i];
break;
case 'I':
if (i + 1 < argc)
node_in = argv[++i];
break;
case 'o':
if (i + 1 < argc)
device_out = argv[++i];
break;
case 'O':
if (i + 1 < argc)
node_out = argv[++i];
break;
}
}
}
if (verbose) {
fprintf(stderr,"Using: \n");
fprintf(stderr,"Input: ");
if (device_in) {
fprintf(stderr,"device %s\n",device_in);
}else if (node_in){
fprintf(stderr,"%s\n",node_in);
}else{
fprintf(stderr,"NONE\n");
}
fprintf(stderr,"Output: ");
if (device_out) {
fprintf(stderr,"device %s\n",device_out);
}else if (node_out){
fprintf(stderr,"%s\n",node_out);
}else{
fprintf(stderr,"NONE\n");
}
}
if (device_in) {
err = snd_rawmidi_open(&handle_in,NULL,device_in,0);
if (err) {
fprintf(stderr,"snd_rawmidi_open %s failed: %d\n",device_in,err);
}
}
if (node_in && (!node_out || strcmp(node_out,node_in))) {
fd_in = open(node_in,O_RDONLY);
if (fd_in<0) {
fprintf(stderr,"open %s for input failed\n",node_in);
}
}
signal(SIGINT,sighandler);
if (device_out) {
err = snd_rawmidi_open(NULL,&handle_out,device_out,0);
if (err) {
fprintf(stderr,"snd_rawmidi_open %s failed: %d\n",device_out,err);
}
}
if (node_out && (!node_in || strcmp(node_out,node_in))) {
fd_out = open(node_out,O_WRONLY);
if (fd_out<0) {
fprintf(stderr,"open %s for output failed\n",node_out);
}
}
if (node_in && node_out && strcmp(node_out,node_in)==0) {
fd_in = fd_out = open(node_out,O_RDWR);
if (fd_out<0) {
fprintf(stderr,"open %s for input and output failed\n",node_out);
}
}
if (!thru) {
if (handle_in || fd_in!=-1) {
if (clock_type != -1) {
snd_rawmidi_params_t *params;
snd_rawmidi_params_malloc(&params);
if (!handle_in) {
fprintf(stderr, "-c only usable with -i");
clock_type = -1;
}
if (clock_type != -1) {
fprintf(stderr, "Enable kernel clock type %d\n", clock_type);
snd_rawmidi_params_current(handle_in, params);
err = snd_rawmidi_params_set_read_mode(handle_in, params, SND_RAWMIDI_READ_TSTAMP);
if (err) {
fprintf(stderr,"snd_rawmidi_params_set_read_mode failed: %d\n", err);
clock_type = -1;
}
}
if (clock_type != -1) {
err = snd_rawmidi_params_set_clock_type(handle_in, params, clock_type);
if (err) {
fprintf(stderr, "snd_rawmidi_params_set_clock_type failed: %d\n", err);
clock_type = -1;
}
}
if (clock_type != -1) {
err = snd_rawmidi_params(handle_in, params);
if (err) {
fprintf(stderr, "snd_rawmidi_params failed: %d\n", err);
clock_type = -1;
}
}
snd_rawmidi_params_free(params);
}
fprintf(stderr,"Read midi in\n");
fprintf(stderr,"Press ctrl-c to stop\n");
}
if (handle_in) {
unsigned char buf[1024];
ssize_t ret;
while (!stop) {
if (clock_type != -1) {
struct timespec tstamp;
ret = snd_rawmidi_tread(handle_in, &tstamp, buf, sizeof(buf));
if (ret < 0)
fprintf(stderr, "read timestamp error: %d - %s\n", (int)ret, snd_strerror(ret));
if (ret > 0 && verbose) {
fprintf(stderr, "read [%lld:%09lld]", (long long)tstamp.tv_sec, (long long)tstamp.tv_nsec);
for (i = 0; i < ret; i++)
fprintf(stderr, " %02x", buf[i]);
fprintf(stderr, "\n");
}
} else {
ret = snd_rawmidi_read(handle_in, buf, sizeof(buf));
if (ret < 0)
fprintf(stderr, "read error: %d - %s\n", (int)ret, snd_strerror(ret));
if (ret > 0 && verbose)
for (i = 0; i < ret; i++)
fprintf(stderr,"read %02x\n",buf[i]);
}
}
}
if (fd_in!=-1) {
unsigned char ch;
while (!stop) {
read(fd_in,&ch,1);
if (verbose) {
fprintf(stderr,"read %02x\n",ch);
}
}
}
if (handle_out || fd_out!=-1) {
fprintf(stderr,"Writing note on / note off\n");
}
if (handle_out) {
unsigned char ch;
ch=0x90; snd_rawmidi_write(handle_out,&ch,1);
ch=60; snd_rawmidi_write(handle_out,&ch,1);
ch=100; snd_rawmidi_write(handle_out,&ch,1);
snd_rawmidi_drain(handle_out);
sleep(1);
ch=0x90; snd_rawmidi_write(handle_out,&ch,1);
ch=60; snd_rawmidi_write(handle_out,&ch,1);
ch=0; snd_rawmidi_write(handle_out,&ch,1);
snd_rawmidi_drain(handle_out);
}
if (fd_out!=-1) {
unsigned char ch;
ch=0x90; write(fd_out,&ch,1);
ch=60; write(fd_out,&ch,1);
ch=100; write(fd_out,&ch,1);
sleep(1);
ch=0x90; write(fd_out,&ch,1);
ch=60; write(fd_out,&ch,1);
ch=0; write(fd_out,&ch,1);
}
} else {
if ((handle_in || fd_in!=-1) && (handle_out || fd_out!=-1)) {
if (verbose) {
fprintf(stderr,"Testing midi thru in\n");
}
while (!stop) {
unsigned char ch;
if (handle_in) {
snd_rawmidi_read(handle_in,&ch,1);
}
if (fd_in!=-1) {
read(fd_in,&ch,1);
}
if (verbose) {
fprintf(stderr,"thru: %02x\n",ch);
}
if (handle_out) {
snd_rawmidi_write(handle_out,&ch,1);
snd_rawmidi_drain(handle_out);
}
if (fd_out!=-1) {
write(fd_out,&ch,1);
}
}
}else{
fprintf(stderr,"Testing midi thru needs both input and output\n");
exit(-1);
}
}
if (verbose) {
fprintf(stderr,"Closing\n");
}
if (handle_in) {
snd_rawmidi_drain(handle_in);
snd_rawmidi_close(handle_in);
}
if (handle_out) {
snd_rawmidi_drain(handle_out);
snd_rawmidi_close(handle_out);
}
if (fd_in!=-1) {
close(fd_in);
}
if (fd_out!=-1) {
close(fd_out);
}
return 0;
}
snd_strerror
const char * snd_strerror(int errnum)
Returns the message for an error code.
Definition error.c:51
snd_rawmidi_write
ssize_t snd_rawmidi_write(snd_rawmidi_t *rmidi, const void *buffer, size_t size)
write MIDI bytes to MIDI stream
Definition rawmidi.c:1080
snd_rawmidi_open
int snd_rawmidi_open(snd_rawmidi_t **in_rmidi, snd_rawmidi_t **out_rmidi, const char *name, int mode)
Opens a new connection to the RawMidi interface.
Definition rawmidi.c:312
snd_rawmidi_params
int snd_rawmidi_params(snd_rawmidi_t *rmidi, snd_rawmidi_params_t *params)
set parameters about rawmidi stream
Definition rawmidi.c:921
snd_rawmidi_tread
ssize_t snd_rawmidi_tread(snd_rawmidi_t *rmidi, struct timespec *tstamp, void *buffer, size_t size)
read MIDI bytes from MIDI stream with timestamp
Definition rawmidi.c:1113
snd_rawmidi_params_set_read_mode
int snd_rawmidi_params_set_read_mode(const snd_rawmidi_t *rawmidi, snd_rawmidi_params_t *params, snd_rawmidi_read_mode_t val)
set read mode
Definition rawmidi.c:838
snd_rawmidi_params_current
int snd_rawmidi_params_current(snd_rawmidi_t *rmidi, snd_rawmidi_params_t *params)
get current parameters about rawmidi stream
Definition rawmidi.c:942
snd_rawmidi_params_set_clock_type
int snd_rawmidi_params_set_clock_type(const snd_rawmidi_t *rawmidi, snd_rawmidi_params_t *params, snd_rawmidi_clock_t val)
sets clock type for tstamp type framing
Definition rawmidi.c:891
snd_rawmidi_params_t
struct _snd_rawmidi_params snd_rawmidi_params_t
Definition rawmidi.h:47
snd_rawmidi_read
ssize_t snd_rawmidi_read(snd_rawmidi_t *rmidi, void *buffer, size_t size)
read MIDI bytes from MIDI stream
Definition rawmidi.c:1095
snd_rawmidi_t
struct _snd_rawmidi snd_rawmidi_t
Definition rawmidi.h:68
snd_rawmidi_close
int snd_rawmidi_close(snd_rawmidi_t *rmidi)
close RawMidi handle
Definition rawmidi.c:360
snd_rawmidi_drain
int snd_rawmidi_drain(snd_rawmidi_t *rmidi)
drain all bytes in the rawmidi I/O ring buffer
Definition rawmidi.c:1068
snd_rawmidi_params_free
void snd_rawmidi_params_free(snd_rawmidi_params_t *obj)
frees the snd_rawmidi_params_t structure
Definition rawmidi.c:721
snd_rawmidi_params_malloc
int snd_rawmidi_params_malloc(snd_rawmidi_params_t **ptr)
allocate the snd_rawmidi_params_t structure
Definition rawmidi.c:705