data pre-processing from EDF to mat

[famousgrouse]

Hi Ziyu Jia,

Could you please upload the EDF processing code or tools as well?

BW
Ben

[ziyujia]

Thanks for your attention,

In order to convert .edf files to other formats, one method is to use the "edflib" library (https://www.teuniz.net/edflib/index.html) to read the edf file.

The following is a brief C/C++ code that can read the data in the edf file into the memory.

#include "stdio.h"  
#include "edflib.h"  
  
#define num_channel 26      // number of channels  
#define max_timepoint 7950005 // max sampling time points  
  
double data[num_channel][max_timepoint]; // data matrix  
edf_annotation_struct annot[1000];      // label (annotation)  
  
int main() {  
    int i;  
    char path[200] = "XXXX.edf"; // edf file path  
  
    edf_hdr_struct hdr; // edf header  
    edfopen_file_readonly(path, &hdr, 2); // open the edf file, header info->hdr  
  
    // Read labels (annotations) ->annot  
    for (i = 0; i < hdr.annotations_in_file; i++)  
        edf_get_annotation(0, i, &annot[i]);  
  
    // Read data matrix ->data  
    for (i = 0; i < num_channel; i++)  
        edfread_physical_samples(0, i, hdr.file_duration / hdr.datarecord_duration * hdr.signalparam[i].smp_in_datarecord, data[i]);  
    edfclose_file(0);  
  
    /* 
    You can use any method (txt, mat...) to save the data matrix and labels here. 
    Note：The timepoint of some channels may not use the pre-allocated maximum length. 
    */  
  
    return 0;  
}  

Of course, this is just a demo, and you need to carefully adjust the code for specific use.
In addition, tools such as EDFbrowser and mne may also be helpful to you.

Best Regards.