gistfile1.c

#include "ruby.h"
#include "edflib.h"

static VALUE EdfConverter;

char *path;
/* edf file description */
struct edf_hdr_struct hdr;
/* a handle (identifier) used to distinguish the different files */
int hdl;
/* buffer for seeking signals */
double *buf;

void output(){
    printf("number of datarecords in the file: %lli\n", hdr.datarecords_in_file);
    printf("signalcount is: %d\n", hdr.edfsignals);
    for (int i=0; i<hdr.edfsignals; i++){
        printf("Signal %d\n", i);
        printf("label: %s\n", hdr.signalparam[i].label);
        printf("samples in file: %lli\n", hdr.signalparam[i].smp_in_file);
        printf("samples in datarecord: %i\n", hdr.signalparam[i].smp_in_datarecord);
        printf("physical maximum: %f\n", hdr.signalparam[i].phys_max);
        printf("physical minimum: %f\n", hdr.signalparam[i].phys_min);
        printf("digital maximum: %i\n", hdr.signalparam[i].dig_max);
        printf("digital minimum: %i\n", hdr.signalparam[i].dig_min);
        printf("physical dimension: %s\n", hdr.signalparam[i].physdimension);
        printf("samplefrequency: %f\n\n", ((double)hdr.signalparam[i].smp_in_datarecord / (double)hdr.datarecord_duration) * EDFLIB_TIME_DIMENSION);
    }
}

void setVariables(){
    path = (char *)"ecg_2_10_sec.edf"; /* init with default path*/
}

int openFile(){
    if(edfopen_file_readonly(path, &hdr, EDFLIB_READ_ALL_ANNOTATIONS)){
        switch(hdr.filetype){
            case EDFLIB_MALLOC_ERROR                : printf("\nmalloc error\n\n");
            break;
            case EDFLIB_NO_SUCH_FILE_OR_DIRECTORY   : printf("\ncan not open file, no such file or directory\n\n");
            break;
            case EDFLIB_FILE_CONTAINS_FORMAT_ERRORS : printf("\nthe file is not EDF(+) or BDF(+) compliant\n"
                "(it contains format errors)\n\n");
            break;
            case EDFLIB_MAXFILES_REACHED            : printf("\nto many files opened\n\n");
            break;
            case EDFLIB_FILE_READ_ERROR             : printf("\na read error occurred\n\n");
            break;
            case EDFLIB_FILE_ALREADY_OPENED         : printf("\nfile has already been opened\n\n");
            break;
            default                                 : printf("\nunknown error\n\n");
            break;
        }
        return(1);
    }else return (0);
}

VALUE run_output(VALUE rb_self){
    setVariables();
    if(openFile()){
        /* ERROR */
    }else{
        output();
    }
    return rb_self;
}

void Init_edfconverter(){
        EdfConverter = rb_define_class("EdfConverter", rb_cObject);
        rb_define_method(EdfConverter, "run", run_output, 0);
}