/*
- Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
*/
-#include <cmath>
#include "frame_rate_change.h"
+#include "types.h"
+#include "content.h"
+#include "film.h"
#include "compose.hpp"
+#include <cmath>
#include "i18n.h"
using std::string;
+using std::shared_ptr;
static bool
about_equal (double a, double b)
{
- /* A film of F seconds at f FPS will be Ff frames;
- Consider some delta FPS d, so if we run the same
- film at (f + d) FPS it will last F(f + d) seconds.
-
- Hence the difference in length over the length of the film will
- be F(f + d) - Ff frames
- = Ff + Fd - Ff frames
- = Fd frames
- = Fd/f seconds
-
- So if we accept a difference of 1 frame, ie 1/f seconds, we can
- say that
-
- 1/f = Fd/f
- ie 1 = Fd
- ie d = 1/F
+ return (fabs (a - b) < VIDEO_FRAME_RATE_EPSILON);
+}
- So for a 3hr film, ie F = 3 * 60 * 60 = 10800, the acceptable
- FPS error is 1/F ~= 0.0001 ~= 10-e4
- */
+FrameRateChange::FrameRateChange ()
+ : source (24)
+ , dcp (24)
+ , skip (false)
+ , repeat (1)
+ , change_speed (false)
+ , speed_up (1)
+{
- return (fabs (a - b) < 1e-4);
}
-
FrameRateChange::FrameRateChange (double source_, int dcp_)
- : source (source_)
- , dcp (dcp_)
- , skip (false)
+ : skip (false)
, repeat (1)
, change_speed (false)
{
+ construct (source_, dcp_);
+}
+
+void
+FrameRateChange::construct (double source_, int dcp_)
+{
+ source = source_;
+ dcp = dcp_;
+
if (fabs (source / 2.0 - dcp) < fabs (source - dcp)) {
/* The difference between source and DCP frame rate will be lower
(i.e. better) if we skip.
change_speed = !about_equal (speed_up, 1.0);
}
+FrameRateChange::FrameRateChange (shared_ptr<const Film> film, shared_ptr<const Content> content)
+ : skip (false)
+ , repeat (1)
+{
+ construct (content->active_video_frame_rate(film), film->video_frame_rate());
+}
+
+FrameRateChange::FrameRateChange (shared_ptr<const Film> film, Content const * content)
+ : skip (false)
+ , repeat (1)
+{
+ construct (content->active_video_frame_rate(film), film->video_frame_rate());
+}
+
string
FrameRateChange::description () const
{
if (change_speed) {
double const pc = dcp * 100 / (source * factor());
- description += String::compose (_("DCP will run at %1%% of the content speed.\n"), pc);
+ char buffer[256];
+ snprintf (buffer, sizeof(buffer), _("DCP will run at %.1f%% of the content speed.\n"), pc);
+ description += buffer;
}
}