/*
- Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2014-2018 Carl Hetherington <cth@carlh.net>
- This program is free software; you can redistribute it and/or modify
+ This file is part of DCP-o-matic.
+
+ DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
- This program is distributed in the hope that it will be useful,
+ DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#define DCPOMATIC_TIME_H
#include "frame_rate_change.h"
-#include "safe_stringstream.h"
#include "dcpomatic_assert.h"
+#include <boost/optional.hpp>
#include <stdint.h>
#include <cmath>
#include <ostream>
-#include <sstream>
#include <iomanip>
+#include <cstdio>
+
+struct dcpomatic_time_ceil_test;
+struct dcpomatic_time_floor_test;
-class dcpomatic_round_up_test;
+namespace dcpomatic {
/** A time in seconds, expressed as a number scaled up by Time::HZ. We want two different
- * versions of this class, ContentTime and DCPTime, and we want it to be impossible to
+ * versions of this class, dcpomatic::ContentTime and dcpomatic::DCPTime, and we want it to be impossible to
* convert implicitly between the two. Hence there's this template hack. I'm not
* sure if it's the best way to do it.
*
return *this;
}
+ Time<S, O> operator/ (int o) const {
+ return Time<S, O> (_t / o);
+ }
+
/** Round up to the nearest sampling interval
* at some sampling rate.
* @param r Sampling rate.
*/
- Time<S, O> round_up (float r) {
- Type const n = rint (HZ / r);
- Type const a = _t + n - 1;
- return Time<S, O> (a - (a % n));
+ Time<S, O> ceil (double r) const {
+ return Time<S, O> (llrint (HZ * frames_ceil(r) / r));
+ }
+
+ Time<S, O> floor (double r) const {
+ return Time<S, O> (llrint (HZ * frames_floor(r) / r));
+ }
+
+ Time<S, O> round (double r) const {
+ return Time<S, O> (llrint (HZ * frames_round(r) / r));
}
double seconds () const {
}
template <typename T>
- int64_t frames (T r) const {
- return floor (_t * r / HZ);
+ int64_t frames_round (T r) const {
+ /* We must cast to double here otherwise if T is integer
+ the calculation will round down before we get the chance
+ to llrint().
+ */
+ return llrint (_t * double(r) / HZ);
+ }
+
+ template <typename T>
+ int64_t frames_floor (T r) const {
+ return ::floor (_t * r / HZ);
+ }
+
+ template <typename T>
+ int64_t frames_ceil (T r) const {
+ /* We must cast to double here otherwise if T is integer
+ the calculation will round down before we get the chance
+ to ceil().
+ */
+ return ::ceil (_t * double(r) / HZ);
}
- /** @param r Frames per second */
+ /** Split a time into hours, minutes, seconds and frames.
+ * @param r Frames per second.
+ * @param h Returned hours.
+ * @param m Returned minutes.
+ * @param s Returned seconds.
+ * @param f Returned frames.
+ */
template <typename T>
void split (T r, int& h, int& m, int& s, int& f) const
{
/* Do this calculation with frames so that we can round
to a frame boundary at the start rather than the end.
*/
- int64_t ff = frames (r);
+ int64_t ff = frames_round (r);
h = ff / (3600 * r);
ff -= h * 3600 * r;
int f;
split (r, h, m, s, f);
- SafeStringStream o;
- o.width (2);
- o.fill ('0');
- o << std::setw(2) << std::setfill('0') << h << ":"
- << std::setw(2) << std::setfill('0') << m << ":"
- << std::setw(2) << std::setfill('0') << s << ":"
- << std::setw(2) << std::setfill('0') << f;
- return o.str ();
+ char buffer[128];
+ snprintf (buffer, sizeof (buffer), "%02d:%02d:%02d:%02d", h, m, s, f);
+ return buffer;
}
static Time<S, O> from_seconds (double s) {
- return Time<S, O> (rint (s * HZ));
+ return Time<S, O> (llrint (s * HZ));
}
template <class T>
return Time<S, O> (INT64_MAX);
}
+ static const int HZ = 96000;
+
private:
- friend struct dcptime_round_up_test;
+ friend struct ::dcpomatic_time_ceil_test;
+ friend struct ::dcpomatic_time_floor_test;
Type _t;
- static const int HZ = 96000;
};
class ContentTimeDifferentiator {};
/** Time relative to the start of the output DCP in its frame rate */
typedef Time<DCPTimeDifferentiator, ContentTimeDifferentiator> DCPTime;
-class ContentTimePeriod
+template <class T>
+class TimePeriod
{
public:
- ContentTimePeriod () {}
+ TimePeriod () {}
- ContentTimePeriod (ContentTime f, ContentTime t)
+ TimePeriod (T f, T t)
: from (f)
, to (t)
{}
- ContentTime from;
- ContentTime to;
+ /** start time of sampling interval that the period is from */
+ T from;
+ /** start time of next sampling interval after the period */
+ T to;
- ContentTimePeriod operator+ (ContentTime const & o) const {
- return ContentTimePeriod (from + o, to + o);
+ T duration () const {
+ return to - from;
}
- bool overlaps (ContentTimePeriod const & o) const;
- bool contains (ContentTime const & o) const;
+ TimePeriod<T> operator+ (T const & o) const {
+ return TimePeriod<T> (from + o, to + o);
+ }
+
+ boost::optional<TimePeriod<T> > overlap (TimePeriod<T> const & other) const {
+ T const max_from = std::max (from, other.from);
+ T const min_to = std::min (to, other.to);
+
+ if (max_from >= min_to) {
+ return boost::optional<TimePeriod<T> > ();
+ }
+
+ return TimePeriod<T> (max_from, min_to);
+ }
+
+ bool contains (T const & other) const {
+ return (from <= other && other < to);
+ }
+
+ bool operator< (TimePeriod<T> const & o) const {
+ if (from != o.from) {
+ return from < o.from;
+ }
+ return to < o.to;
+ }
+
+ bool operator== (TimePeriod<T> const & other) const {
+ return from == other.from && to == other.to;
+ }
+
+ bool operator!= (TimePeriod<T> const & other) const {
+ return !(*this == other);
+ }
};
+/** @param A Period which is subtracted from.
+ * @param B Periods to subtract from `A', must be in ascending order of start time and must not overlap.
+ */
+template <class T>
+std::list<TimePeriod<T> > subtract (TimePeriod<T> A, std::list<TimePeriod<T> > const & B)
+{
+ std::list<TimePeriod<T> > result;
+ result.push_back (A);
+
+ for (auto i: B) {
+ std::list<TimePeriod<T> > new_result;
+ for (auto j: result) {
+ boost::optional<TimePeriod<T> > ov = i.overlap (j);
+ if (ov) {
+ if (*ov == i) {
+ /* A contains all of B */
+ if (i.from != j.from) {
+ new_result.push_back (TimePeriod<T> (j.from, i.from));
+ }
+ if (i.to != j.to) {
+ new_result.push_back (TimePeriod<T> (i.to, j.to));
+ }
+ } else if (*ov == j) {
+ /* B contains all of A */
+ } else if (i.from < j.from) {
+ /* B overlaps start of A */
+ new_result.push_back (TimePeriod<T> (i.to, j.to));
+ } else if (i.to > j.to) {
+ /* B overlaps end of A */
+ new_result.push_back (TimePeriod<T> (j.from, i.from));
+ }
+ } else {
+ new_result.push_back (j);
+ }
+ }
+ result = new_result;
+ }
+
+ return result;
+}
+
+typedef TimePeriod<ContentTime> ContentTimePeriod;
+typedef TimePeriod<DCPTime> DCPTimePeriod;
+
DCPTime min (DCPTime a, DCPTime b);
DCPTime max (DCPTime a, DCPTime b);
ContentTime min (ContentTime a, ContentTime b);
ContentTime max (ContentTime a, ContentTime b);
-std::ostream& operator<< (std::ostream& s, ContentTime t);
-std::ostream& operator<< (std::ostream& s, DCPTime t);
+std::string to_string (ContentTime t);
+std::string to_string (DCPTime t);
+std::string to_string (DCPTimePeriod p);
+
+}
#endif