Seek past trim on setting up player pieces.

[dcpomatic.git] / src / lib / video_content.cc

diff --git a/src/lib/video_content.cc b/src/lib/video_content.cc
index 3478368555b8139944144170b05ab67198134d4b..d0eab4dbf93f870344b7c34228ed14d7813ad26d 100644 (file)
--- 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);
+}