Move / update some design docs.

4 files changed, 35 insertions, 2158 deletions

diff --git a/doc/design/audio_path.svg b/doc/design/audio_path.svg
deleted file mode 100644
index c75d505b4..000000000
--- a/doc/design/audio_path.svg
+++ /dev/null
@@ -1,408 +0,0 @@
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diff --git a/doc/design/dcpomatic.svg b/doc/design/dcpomatic.svg
deleted file mode 100644
index dc9cd9166..000000000
--- a/doc/design/dcpomatic.svg
+++ /dev/null
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-       y="241.20003"
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-       style="font-size:10px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#800000;fill-opacity:1;stroke:none;font-family:Latin Modern Roman;-inkscape-font-specification:Latin Modern Roman"
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-         sodipodi:role="line">e.g. frame rate, J2K bandwidth </tspan></text>
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-       y="95.214684"
-       x="1025.1324"
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-       id="text5979"
-       y="143.48494"
-       x="1242.3323"
-       style="font-size:10px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-indent:0;text-align:start;text-decoration:none;line-height:125%;letter-spacing:0px;word-spacing:0px;text-transform:none;direction:ltr;block-progression:tb;writing-mode:lr-tb;text-anchor:start;baseline-shift:baseline;color:#000000;fill:#800000;fill-opacity:1;fill-rule:nonzero;stroke:none;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate;font-family:Latin Modern Roman;-inkscape-font-specification:Latin Modern Roman"
-       xml:space="preserve"><tspan
-         y="143.48494"
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diff --git a/doc/design/decoder_structures.tex b/doc/design/decoder_structures.tex
index 64a7da752..594c66450 100644
--- a/doc/design/decoder_structures.tex
+++ b/doc/design/decoder_structures.tex
@@ -162,7 +162,7 @@ Questions:
 \begin{itemize}
 \item Add signals to \texttt{Player}.
   \begin{itemize}
-    \item \texttt{signal<void (shared\_ptr<PlayerVideo>), DCPTime> Video;}
+    \item \texttt{signal<void (shared\_ptr<PlayerVideo>), DCPTime)> Video;}
     \item \texttt{signal<void (shared\_ptr<AudioBuffers>, DCPTime)> Audio;}
     \item \texttt{signal<void (PlayerSubtitles, DCPTimePeriod)> Subtitle;}
   \end{itemize}
@@ -174,4 +174,38 @@ Questions:
   \item Remove \texttt{get} methods from \texttt{Player}; replace with \texttt{pass()} and \texttt{seek()}.
 \end{itemize}
 
+
+\section{Summary of work done in \texttt{back-to-pass}}
+
+The diff between \texttt{back-to-pass} and \texttt{master} as at 21/2/2017 can be summarised as:
+
+\begin{enumerate}
+\item Remove \texttt{AudioDecoderStream}; no more need to buffer, and resampling is done in \texttt{Player}.
+\item \texttt{AudioDecoder} is simple; basically counting frames.
+\item All subtitles-during stuff is gone; no need to know what happens in a particular period as we just wait and see.
+\item Pass reason stuff gone; not sure what it was for but seems to have been a contortion related to trying to find specific stuff.
+  \item \texttt{Player::pass} back, obviously.
+  \item \texttt{Player::get\_video}, \texttt{get\_audio} and
+    \texttt{get\_subtitle} more-or-less become \texttt{Player}'s
+    handlers for emissions from decoders; lots of buffering crap gone
+    in the process.
+  \item Add \texttt{Decoder::position} stuff so that we know what to \texttt{pass()} in \texttt{Player}.
+  \item Add \texttt{AudioMerger}; necessary as audio arrives at the
+    \texttt{Player} from different streams at different times.  The
+    \texttt{AudioMerger} just accepts data, mixes and spits it out
+    again.
+\item Obvious consumer changes: what was a loop over the playlist
+  length and calls to \texttt{get()} is now calls to \texttt{pass()}.
+  \item Maybe-seek stuff gone.
+  \item Some small \texttt{const}-correctness bits.
+\end{enumerate}
+
+Obvious things to do:
+
+\begin{enumerate}
+\item Ensure AudioMerger is being tested.
+\item Ensure hardest-case in video / audio is being tested.
+\item Look at symmetry of video/audio paths / APIs.
+\end{enumerate}
+
 \end{document}
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