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#include <lsl_c.h>
#include <stdio.h>
/**
* Example program that demonstrates how to resolve a specific stream on the lab network and how to
* connect to it in order to receive data.
*/
#define NCHANS 8
int main(int argc, char *argv[]) {
unsigned k, t; /* channel index */
lsl_streaminfo info; /* the streaminfo returned by the resolve call */
lsl_inlet inlet; /* a stream inlet to get samples from */
int errcode; /* error code (lsl_lost_error or timeouts) */
float cursample[NCHANS]; /* array to hold our current sample */
double timestamp; /* time stamp of the current sample (in sender time) */
/* resolve the stream of interest (result array: info, array capacity: 1 element, type shall be
* EEG, resolve at least 1 stream, wait forever if necessary) */
printf("Now waiting for an EEG stream...\n");
lsl_resolve_byprop(&info, 1, "type", "EEG", 1, LSL_FOREVER);
/* These next two variables aren't used for anything in this example.
* They simply demonstrate how to use streaminfo getters. */
lsl_channel_format_t fmt = lsl_get_channel_format(info);
double srate = lsl_get_nominal_srate(info);
/* make an inlet to read data from the stream (buffer max. 300 seconds of data, no preference
* regarding chunking, automatic recovery enabled) */
inlet = lsl_create_inlet(info, 300, LSL_NO_PREFERENCE, 1);
/* subscribe to the stream (automatically done by push, but a nice way of checking early on that
* we can connect successfully) */
lsl_open_stream(inlet, LSL_FOREVER, &errcode);
if (errcode != 0) return errcode;
printf("Displaying data...\n");
for (t = 0; t < 100000000; t++) {
/* get the next sample form the inlet (read into cursample, 8 values, wait forever if
* necessary) and return the timestamp if we got something */
timestamp = lsl_pull_sample_f(inlet, cursample, NCHANS, LSL_FOREVER, &errcode);
/* print the data */
printf("%.2f", timestamp);
for (k = 0; k < 8; ++k) printf("\t%.2f", cursample[k]);
printf("\n");
}
/* we never get here, but anyway */
lsl_destroy_inlet(inlet);
return 0;
}
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