/test/rawmidi.c

#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, "    -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 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 '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) {
            fprintf(stderr,"Read midi in\n");
            fprintf(stderr,"Press ctrl-c to stop\n");
        }

        if (handle_in) {
            unsigned char ch;
            while (!stop) {
                snd_rawmidi_read(handle_in,&ch,1);
                if (verbose) {
                    fprintf(stderr,"read %02x\n",ch);
                }
            }
        }
        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;
}