- /** frames per second for the DCP */
- int frames_per_second;
- /** Skip every `skip' frames. e.g. if this is 1, we skip nothing;
- * if it's 2, we skip every other frame.
- */
- int skip;
- /** true if this DCP will run its video faster than the source
- * (e.g. if the source is 29.97fps and we will run the DCP at 30fps)
+ FrameRateConversion (float, int);
+
+ /** @return factor by which to multiply a source frame rate
+ to get the effective rate after any skip or repeat has happened.
+ */
+ float factor () const {
+ if (skip) {
+ return 0.5;
+ } else if (repeat) {
+ return 2;
+ }
+
+ return 1;
+ }
+
+ /** true to skip every other frame */
+ bool skip;
+ /** true to repeat every frame once */
+ bool repeat;
+ /** true if this DCP will run its video faster or slower than the source
+ * without taking into account `repeat' nor `skip'.
+ * (e.g. change_speed will be true if
+ * source is 29.97fps, DCP is 30fps
+ * source is 14.50fps, DCP is 30fps
+ * but not if
+ * source is 15.00fps, DCP is 30fps
+ * source is 12.50fps, DCP is 25fps)