Fix tests.

1 files changed, 645 insertions, 0 deletions

diff --git a/doc/design/timing.svg b/doc/design/timing.svg
new file mode 100644
index 000000000..30325e7db
--- /dev/null
+++ b/doc/design/timing.svg
@@ -0,0 +1,645 @@
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+
+<svg
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+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
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+   version="1.1"
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+   sodipodi:docname="timing.svg">
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+        <dc:title></dc:title>
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+    <text
+       xml:space="preserve"
+       style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:TeX Gyre Schola;-inkscape-font-specification:TeX Gyre Schola"
+       x="17"
+       y="22.094482"
+       id="text2985"
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+       transform="translate(0,308.2677)"><tspan
+         sodipodi:role="line"
+         id="tspan2987"
+         x="17"
+         y="22.094482">FFmpeg sources are by far the most complicated, so we consider those only.</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="37.094482"
+         id="tspan2989"></tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="52.094482"
+         id="tspan4675">Hardest video case:</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="67.094482"
+         id="tspan4584" /><tspan
+         sodipodi:role="line"
+         x="17"
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+         sodipodi:role="line"
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+         y="97.094482"
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+         sodipodi:role="line"
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+         id="tspan4590" /><tspan
+         sodipodi:role="line"
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+         y="127.09448"
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+         sodipodi:role="line"
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+         sodipodi:role="line"
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+         id="tspan4596" /><tspan
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+         y="172.09448"
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+         sodipodi:role="line"
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+         sodipodi:role="line"
+         x="17"
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+         id="tspan4602" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="217.09448"
+         id="tspan4604" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="232.09448"
+         id="tspan4606" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="247.09448"
+         id="tspan4608" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="262.09448"
+         id="tspan4610" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="277.09448"
+         id="tspan4612">Content frames arrive with ContentTime; this is converted to DCP time and checked for validity against</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="292.09448"
+         id="tspan4622">_video_position.  _video_position is incremented by one DCP frame period each time a frame is emitted.</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="307.09448"
+         id="tspan4657">Emission is timestamped with _video_position.</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="322.09448"
+         id="tspan4661" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="337.09448"
+         id="tspan4663">In general, the Decoded::dcp_time is used as a check against the actual position in the DCP (based</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="352.09448"
+         id="tspan4630">on what has been emitted).</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="367.09448"
+         id="tspan4671" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="382.09448"
+         id="tspan4673">Hardest audio case:</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="397.09448"
+         id="tspan4785" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="412.09448"
+         id="tspan4787" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="427.09448"
+         id="tspan4789" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="442.09448"
+         id="tspan4791" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="457.09448"
+         id="tspan4793" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="472.09448"
+         id="tspan4795" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="487.09448"
+         id="tspan4797" /><tspan
+         sodipodi:role="line"
+         x="17"
+         y="502.09448"
+         id="tspan4799">Timestamps are not sample-accurate, here B should be after A but its timestamp says different.  Things</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="517.09448"
+         id="tspan4801">are further complicated by resampling, which renders timestamps invalid.  The upshot is that audio</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="532.09448"
+         id="tspan4803">timestamps are basically useless.  However, since audio is (apparently) always continuous in content files</tspan><tspan
+         sodipodi:role="line"
+         x="17"
+         y="547.09448"
+         id="tspan4805">we can make our own timestamps.</tspan></text>
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