[Bug 28039] IAudioClock_GetPosition must ignore underruns (MacOS)

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=28039

--- Comment #5 from Jörg Höhle <hoehle at users.sourceforge.net> 2011-11-23 02:21:57 CST ---
Created attachment 37588
  --> http://bugs.winehq.org/attachment.cgi?id=37588
render.ok test output of my extended mmdevapi tests

My mmdevapi position tests now mostly pass, great.
What's striking is that position is generally equal to sum of written frames -
GetCurrentPadding.  This is not unlike native's exclusive mode.  Perhaps you
want to check for rounding errors because it's sometimes off by one as in:
render.c:1143: padding 17617 position 17420/17421 slept 550ms iteration 1
render.c:1143: padding 17622 position 30700/30701 slept 850ms iteration 4
Or is that simply an effect of time advancing between 2 calls?

I've yet to spend more time, but I've noticed that if you increase the big
sleep  prior to my rendering loop from 350 to 450ms, there's a test failure at
iteration 1 (normal after an underrun) but also at iteration 2:
render.c:1151: Test failed: Position delta 4933 not regular
That does not make GetPosition appear like a true speaker position. It should
not advance by more than 4454 frames in 101ms.

You may want to increase the sleep even more to see that it's a bit odd:
render.c:1090: data at 0x421dc000 for prefill 20671
render.c:1119: hpctime 551 after 550ms
render.c:1138: hpctime 651 pcpos 651
render.c:1143: padding 0 position 20671/20671 slept 650ms iteration 0
render.c:1172: data at 0x421dc000
render.c:1138: hpctime 752 pcpos 752
render.c:1143: padding 15086 position 26255/26256 slept 750ms iteration 1
render.c:1151: Test failed: Position delta 5584 not regular
After an underrun, GetPosition increases too fast (perhaps frames are silently
skipped when a buffer's start time lies in the past).

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