Untested use of Frame for video/audio content lengths.

[dcpomatic.git] / doc / design / resampling.tex

diff --git a/doc/design/resampling.tex b/doc/design/resampling.tex
index cf9cfb1edc220bcdfa6f242b4aeee94427c2a0d5..cb7388eb89937a4589c134f0c8a5cbade1e0d285 100644 (file)
--- a/doc/design/resampling.tex
+++ b/doc/design/resampling.tex
@@ -53,4 +53,11 @@ and $C_A$, resample the audio to $R_A$ where
 R_A &= \frac{C_V F_A}{F_V}
 \end{align*}
 
+Once this is done, consider 1 second's worth of content samples ($C_A$
+samples).  We have turned them into $R_A$ samples which should still
+last 1 second.  These samples are then played back at $F_A$ samples
+per second, so they last $R_A / F_A$ seconds.  Hence there is a
+scaling between some content time and some DCP time of $R_A / F_A$
+i.e. $C_V / F_V$.
+
 \end{document}