1 #ifndef _DISK_SPACE_ESTIMATOR_H
2 #define _DISK_SPACE_ESTIMATOR_H
4 // A class responsible for measuring how much disk there is left when we
5 // store our video to disk, and how much recording time that equates to.
6 // It gets callbacks from the Mux writing the stream to disk (which also
7 // knows which filesystem the file is going to), makes its calculations,
8 // and calls back to the MainWindow, which shows it to the user.
10 // The bitrate is measured over a simple 30-second sliding window.
18 #include <sys/types.h>
20 class DiskSpaceEstimator {
22 typedef std::function<void(off_t free_bytes, double estimated_seconds_left)> callback_t;
23 DiskSpaceEstimator(callback_t callback);
25 // Report that a video frame with the given pts has just been written
26 // to the given file, so the estimator should stat the file and see
27 // by big it is. (The file is assumed to hold only that single frame,
28 // unlike in Nageru, where it is a growing file.)
30 // If the filename changed since last time, the estimation is reset.
31 // <pts> is taken to be in TIMEBASE units (see timebase.h).
32 void report_write(const std::string &filename, uint64_t pts);
35 static constexpr int64_t window_length = 30 * TIMEBASE;
43 std::deque<MeasurePoint> measure_points;
44 uint64_t last_pts_reported = 0;
48 extern DiskSpaceEstimator *global_disk_space_estimator;
50 #endif // !defined(_DISK_SPACE_ESTIMATOR_H)