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44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
#ifndef SC_CLOCK_H
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#define SC_CLOCK_H
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#include "common.h"
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#include "util/tick.h"
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struct sc_clock_point {
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sc_tick system;
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sc_tick stream;
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};
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/**
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* The clock aims to estimate the affine relation between the stream (device)
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* time and the system time:
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*
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* f(stream) = slope * stream + offset
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*
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* Theoretically, the slope encodes the drift between the device clock and the
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* computer clock. It is expected to be very close to 1.
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*
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* Since the clock is used to estimate very close points in the future (which
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* are reestimated on every clock update, see delay_buffer), the error caused
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* by clock drift is totally negligible, so it is better to assume that the
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* slope is 1 than to estimate it (the estimation error would be larger).
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*
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* Therefore, only the offset is estimated.
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*/
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struct sc_clock {
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unsigned range;
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sc_tick offset;
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};
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void
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sc_clock_init(struct sc_clock *clock);
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void
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sc_clock_update(struct sc_clock *clock, sc_tick system, sc_tick stream);
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sc_tick
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sc_clock_to_system_time(struct sc_clock *clock, sc_tick stream);
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#endif
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