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FiffTime

Namespace: FIFFLIB  ·  Library: FIFF Library

#include <fiff/fiff_time.h>

class FIFFLIB::FiffTime

FIFF time stamp: Unix seconds plus a microsecond fraction matching the on-disk fiffTimeRec record.

Layout is two 32-bit fields (secs, usecs) — the exact representation used by FIFF_MEAS_DATE and the per-buffer timestamps embedded in raw data blocks, so an instance can be streamed in and out without per-field marshalling.

src/examples/ex_fiff_structure/main.cpp
QFile structureFile(rawPath);
FiffStream::SPtr stream(new FiffStream(&structureFile));
ok &= stream->open();
const QList<FiffDirEntry::SPtr>& directory = stream->dir(); // every tag (kind, type, size, position) + a kind -1 end
const FiffTime created = stream->id().time;                 // seconds and microseconds since 1970
stream->close();

Public Methods​

FiffTime()​

Default constructor.

Initializes both fields to zero.

FiffTime(p_secs, p_usecs)​

Parameterized constructor.

Parameters:

  • p_secs : qint32 GMT time in seconds since epoch.

  • p_usecs : qint32 Fraction of seconds in microseconds.

~FiffTime()​

Destroys the FiffTime.

Static Methods​

storageSize()​

Size of the old struct (fiffTimeRec) 2int = 24 = 8.

Returns:

  • qint32 — the size of the old struct fiffTimeRec.

Example​

Used in examples​

ex_fiff_structure​

FIFF library: fixed-length epochs, CTF compensation, the file directory and raw buffers, and handing.

src/examples/ex_fiff_structure/main.cpp, line 121
FiffStream::SPtr stream(new FiffStream(&structureFile));
ok &= stream->open();
const QList<FiffDirEntry::SPtr>& directory = stream->dir(); // every tag (kind, type, size, position) + a kind -1 end
const FiffTime created = stream->id().time;                 // seconds and microseconds since 1970
stream->close();
// mne fiff_open: 640 entries; file_id secs 1411146352, usecs 0
ok &= expect(directory.size() == 641 && directory.last()->kind == -1 && created.secs == 1411146352 && created.usecs == 0 && FiffTime::storageSize() == 8 && FiffDirEntry::storageSize() == 16,
             "FiffDirEntry/FiffTime: the 640 tags of mne fiff_open plus the end entry; the file id was written at 1411146352 s");

Authors of this file​