[Bug 28093] GetCurrentPadding must slowly decrease (MacOS)

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=28093

Jörg Höhle <hoehle at users.sourceforge.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major

--- Comment #1 from Jörg Höhle <hoehle at users.sourceforge.net> 2011-09-19 03:40:45 CDT ---
This is a major design bug that affects many winmm applications.

It explains why winecfg's test sound clicks several times and does not produce
the expected sound: underruns occur because winmm plays pong with a single
100ms buffer!

DSound apps seem not affected because they use very small writes w.r.t.
GetBufferSize, so several buffers are in use.

Solving this presumably mean the end to the current nice & (too) simple code in
winecoreaudio and require managing a buffer like in winealsa and wineoss.

Noteworthy: While winecfg's 44100Hz IMA_ADPCM test sound causes audible
underruns, another at 11025Hz does not. This means that the CoreAudio buffer
callbacks are invoked early enough for the underrun not to happen in the
11025Hz case, i.e. before the buffer's last sample is played to the speaker.
Presumably CoreAudio's resampler introduces sufficient latency and buffering to
prevent an audible underrun. Nevertheless, the gap is tiny: my log shows the
callback happens within the last 3ms of that 100ms buffer.

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