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.
20 class DiskSpaceEstimator
23 typedef std::function<void(off_t free_bytes, double estimated_seconds_left)> callback_t;
24 DiskSpaceEstimator(callback_t callback);
26 // Report that a video frame with the given pts has just been written
27 // to the given file, so the estimator should stat the file and see
28 // by how much it grew since last time. Called by the Mux object
29 // responsible for writing to the stream on disk.
31 // If the filename changed since last time, the estimation is reset.
32 // <pts> is taken to be in TIMEBASE units (see timebase.h).
33 void report_write(const std::string &filename, uint64_t pts);
36 static constexpr int64_t window_length = 30 * TIMEBASE;
39 std::string last_filename;
45 std::deque<MeasurePoint> measure_points;
48 extern DiskSpaceEstimator *global_disk_space_estimator;
50 #endif // !defined(_DISK_SPACE_ESTIMATOR_H)