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Mechanical rename to more accurate plural form
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This removes the timer thread entirely in favor of a coordinated
delay loop directly within rmdGetFrame.
When there's an audio stream to synchronize with, avd is
maintained by the pcm buffer updates, and the fps-derived
frametimes synchronize with the audio that way.
When there's no audio stream (--no-sound), avd is now maintained
synthetically via clock_gettime(CLOCK_MONOTONIC) coordinating
with the clock instead.
There's been some reworking of frame sampling/reusing and cloning
logic, which may need some refinement. But for now the tests
seem to show promise.
The old timer approach just increased the non-determinism by
adding more scheduler latency and influence unnecessarily.
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This minimally switches all the ad-hoc image cache files handling
over to using CacheFile.
I left the audio cache alone for now as it seems to not be
compressed. It might make sense in the future to switch that
over as well, especially if I start adding features to CacheFile
like preallocating and async periodic fdatasync.
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Making things a bit more consistent
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Acquiring the new frame can take a potentially significant amount of
time, rather than letting any frames dropped during the acquire get
all taken by the next frame, update this one to include them.
It's both more accurate (the dropped frames occurred literally while
this was going on) and makes it more likely get_frame() will have
to wait on the upcoming cond_wait(time_cond) for the next tick.
If the upcoming cond_wait(time_cond) doesn't wait because a new
frame is already pending, it makes it more likely get_frame() will
snatch yuv_mutex before the encode/cache thread can wake up and
grab it. When that occurs it's effectively dropping frames because
the encode/cache thread gets blocked on yuv_mutex while the contents
get replaced, so the frames the previous contents were going to be
applied to will instead get the updated contents that belong to
the future sample's frames.
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This requires a bit of adjustment in the get_frame time_cond wait
loop so it still services the event loop when woken without advance
At least now get_frame has no explicit pause code, but it does
require the timer keep firing while paused so it signals time_cond.
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Vestigial broadcast, only a single waiter on this now.
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Maybe this made sense at some point in the original code, but the
way I have this setup currently get_frame() should strictly
capture a frame on every tick of the timer at the desired FPS to
the best of its ability.
The capture_frameno gets propagated to the encoder whenever a new
frame is acquired on that timer. When the encoder consumes it,
it should just dupe the frame to fill any gaps between the last
encoded frameno and the new one.
As-is, this avd value seems to drift permanently negative
eventually at which point get_frame() ceases ever waiting on the
timer. That's obviously broken, and devolves into a pinned CPU
with get_frame() attempting an infinitely high frame rate. Which
likely just makes things worse not better by starving the encoder
of CPU time.
I need to go check out the encoder now to make sure it fills
frameno gaps.
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rmdGetFrame() can't just block on pause_cond because it services the
event loop, which may be the very thing responsible for unpausing
when not triggered by an external signal.
The existing code handles this correctly but it spins on polling
the paused flag and running the event loop when paused.
This commit just adds a short delay to that cycle so the rmdGetFrame
thread doesn't pointlessly burn CPU while paused.
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Now users can easily differentiate which rmd subtasks are
busy by using top-like tools in show-threads mode.
Also aids in troubleshooting...
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This restores the recordmydesktop/ subdir as root from the mirror I
cloned by fork from.
I have no particular interest in the gtk/qt frontends and it doesn't
appear they were part of a single tree in the past. But I will
probably preserve backwards compatibility of the cli so they can
continue to work with this fork installed.
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