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Since the sound capture buffers all sound in newly allocated memory,
the "stream time" represented by those buffers can be accounted for
immediately upon reading into the buffer. Doing it later in the
different threads on the other side of the queue, especially after
encoding, is an unnecessary pile of variable capacitance that just
makes things less synchronized for zero gain.
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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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these concepts may return but not in this form
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This brings the !--on-the-fly-encoding mode up to speed.
The cached file header loses the total_frames counter, as the
capture_frameno already represents this.
Dropped frames are detected by simply looking at the difference
between the previous capture_frameno and the current one. This
simply gets passed to the encoder as a n_frames count so theora
can duplicate the frames as needed.
This was being done manually before by looking at the frameno and
total frames in each header and maintaining separate counts for
"extra frames" "missed frames" etc, and resubmitting entire
frames multiply for encoding dropped frames.
So a chunk of code has been thrown out from rmd_load_cache.c, and
some general cleanups have occurred there as well.
I also needed to add more locking around pdata->avd accesses.
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This is focused on keeping --on-the-fly-encoding in sync even
over long videos. The existing code inevitably would fall into a
permanently negative pdata->avd value letting things get
increasingly out of sync and never correcting.
Before removing the vestigial negative avd "don't wait" logic
from get_frame when this permanently negative avd state was
entered, get_frame would just start sampling at an unregulated
fps.
The timer thread which drives get_frame now consults avd on every
tick, Depending on which which half is ahead, the timer will
either cause get_frame to drop frames by advancing the frameno by
more than one, or it will adjust its sleep delay in proportion to
the delta.
See comments in rmd_timer.c for more details.
Note that in testing especially with a loaded system I observed
some surprisingly large deltas where multi-second sleeps occurred
to let the sound catch back up. I expect to revisit this issue
more in the future, but would just like to get things more
correct for now.
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When the encoder finds the encoded - captured frameno delta > 1
it needs to fill the gap somehow.
With how things are currently architected, the old yuv countents
are gone so there's only the current frame available for filling.
The newer theoraenc.h API exposes a theora_control() parameter
for this purpose, so I've also added a theoraenc.h include
implicitly bumping the libtheora dependency. But by now it
shouldn't matter, and the rest of rmd should probably get updated
to use the new theora API eventually anyways.
I'm still uncertain what role pdata->avd will play in the
long-run, but leaving its maintenance for now.
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avd accesses aren't serialized currently despite occurring from
concurrent threads. I'm reworking avd but this just introduces
and initializes a mutex for the existing variable.
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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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Name the timer and sound capture threads as well, and fixup the
rmd{Encode,Cache}Sounds names -> rmd{Encode,Cache}Sound
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Nothing changed, just syntactic sugar to make this
more readable
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usleep() is deprecated by posix in favor of nanosleep(), nanosleep
doesn't dick with signals so it's generally better anyways.
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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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