X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fvideo_content.cc;h=d0eab4dbf93f870344b7c34228ed14d7813ad26d;hb=8053593f2ccff66287c43d20a8f28be9919bff75;hp=3478368555b8139944144170b05ab67198134d4b;hpb=8d31298c71df875d88e9f22061645d54309875eb;p=dcpomatic.git

diff --git a/src/lib/video_content.cc b/src/lib/video_content.cc
index 347836855..d0eab4dbf 100644
--- a/src/lib/video_content.cc
+++ b/src/lib/video_content.cc
@@ -26,6 +26,8 @@
 #include "compose.hpp"
 #include "config.h"
 #include "colour_conversion.h"
+#include "util.h"
+#include "film.h"
 
 #include "i18n.h"
 
@@ -289,3 +291,21 @@ VideoContent::video_size_after_crop () const
 {
 	return crop().apply (video_size_after_3d_split ());
 }
+
+/** @param t A time offset from the start of this piece of content.
+ *  @return Corresponding frame index.
+ */
+VideoContent::Frame
+VideoContent::time_to_content_video_frames (Time t) const
+{
+	shared_ptr<const Film> film = _film.lock ();
+	assert (film);
+	
+	FrameRateConversion frc (video_frame_rate(), film->video_frame_rate());
+
+	/* Here we are converting from time (in the DCP) to a frame number in the content.
+	   Hence we need to use the DCP's frame rate and the double/skip correction, not
+	   the source's rate.
+	*/
+	return t * film->video_frame_rate() / (frc.factor() * TIME_HZ);
+}