[pulseaudio-tickets] [Bug 81075] pa_simple_get_latency() doesnt consider the buffer used by pa_simple_read()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81075

--- Comment #8 from Tanu Kaskinen <tanuk at iki.fi> ---
I attached before/after output from the test program (both were about one
minute runs), as well as graphs generated from those outputs.

What does the test program do, and how to interpret the output files? The
program calls pa_simple_read() in an infinite loop, reading 10000 bytes at a
time. After each read, the program prints "x,y" to stdout, where x is usecs
since the first read (wall clock time) and y is the difference between x and
the cumulative amount of audio that has been read plus the current latency as
reported by pa_simple_get_latency(). I believe that if the latency reporting is
perfect, y should be constant (or change slowly and steadily if there's drift
between the wall clock and the sound card clock).

The patch seems to improve things, but the graph after patching is still far
from a straight line. I don't have time to dig in deeper at this time, so I
think it's best if I apply the patch to master and leave this bug open.

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