EGD_GET_NUMCH(3) EEGDEV library manual EGD_GET_NUMCH(3)NAME
egd_get_numch - Get the number of channels sampled by type
SYNOPSIS
#include <eegdev.h>
int egd_get_numch(const struct eegdev* dev, int stype);
DESCRIPTION
egd_get_numch() returns the number of channels of type stype sampled by the recording device referenced by dev. stype must be one of the
values returned by egd_sensor_type(3).
RETURN VALUE
In case of success, the function returns a non negative value corresponding to the number of channels of type stype (possibly 0 if the
device does not sample this type of data). Otherwise, -1 is returned and errno is set accordingly.
ERRORS
egd_get_numch() will fail if:
EINVAL dev is NULL or stype is not valid value.
SEE ALSO egd_get_cap(3), egd_sensor_type(3)EPFL 2011 EGD_GET_NUMCH(3)
Check Out this Related Man Page
EGD_SENSOR_TYPE(3) EEGDEV library manual EGD_SENSOR_TYPE(3)NAME
egd_sensor_type, egd_sensor_name - Get the id or name of a sensor type
SYNOPSIS
#include <eegdev.h>
int egd_sensor_type(const char* sname);
const char* egd_sensor_name(int stype);
DESCRIPTION
egd_sensor_type() returns the identifier code of the sensor type named sname. egd_sensor_name() is the reverse process: it retrieves the
name of the sensor type identified by stype.
Depending on which acquisition devices have been accessed by the library, the sensor type identifier for a given name may be different from
a previous program execution. However once a association has been established it is ensured that it will remain the same until the process
termination. Additionally, the sensor types named "eeg", "trigger" and "undefined" are always associated respectively to 0, 1 and 2.
RETURN VALUE
In case of success, egd_sensor_type() returns a non negative value corresponding to the identifier of the sensor type called name. Other-
wise it returns -1.
In case of success, egd_sensor_name() returns the name of the sensor type identified by stype. Otherwise, NULL is returned and errno is set
accordingly.
ERRORS
egd_sensor_type() or egd_sensor_name() will fail if:
EINVAL sname is NULL or refers to an unknown sensor type or if stype is not a known sensor type identifier.
SEE ALSO egd_get_numch(3)egd_get_cap(3)EPFL 2011 EGD_SENSOR_TYPE(3)
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