diff options
Diffstat (limited to 'src/sub_time.cc')
| -rw-r--r-- | src/sub_time.cc | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/sub_time.cc b/src/sub_time.cc index 68dac19..c4e00ba 100644 --- a/src/sub_time.cc +++ b/src/sub_time.cc @@ -18,6 +18,7 @@ */ #include "sub_time.h" +#include "sub_assert.h" #include "exceptions.h" #include <cmath> #include <iomanip> @@ -154,8 +155,54 @@ Time::from_hms (int h, int m, int s, int ms) return Time (h * 3600 + m * 60 + s, ms, Rational (1000, 1)); } +/** Create a Time from a number of frames. + * rate must be integer. + */ +Time +Time::from_frames (int f, Rational rate) +{ + SUB_ASSERT (rate.denominator != 0); + SUB_ASSERT (rate.integer ()); + return Time (f / rate.integer_fraction(), f % rate.integer_fraction(), rate); +} + double Time::all_as_seconds () const { return _seconds + double(milliseconds ()) / 1000; } + +/** Add a time to this one. This time must have an integer _rate + * and t must have the same rate. + */ +void +Time::add (Time t) +{ + SUB_ASSERT (_rate); + + _seconds += t._seconds; + _frames += t._frames; + + SUB_ASSERT (_rate.get().denominator != 0); + SUB_ASSERT (_rate.get().integer ()); + + if (_frames >= _rate.get().integer_fraction()) { + _frames -= _rate.get().integer_fraction(); + ++_seconds; + } +} + +void +Time::scale (float f) +{ + SUB_ASSERT (_rate); + SUB_ASSERT (_rate->denominator != 0); + SUB_ASSERT (_rate->integer ()); + + _seconds = rint (_seconds * f); + _frames = rint (_frames * f); + if (_frames >= _rate->integer_fraction()) { + _frames -= _rate->integer_fraction (); + ++_seconds; + } +} |