[Bug 29585] wineoss.drv audio renderer not on par with others

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=29585

--- Comment #8 from Andrew Eikum <aeikum at codeweavers.com> 2012-01-24 10:47:36 CST ---
Created attachment 38531
  --> http://bugs.winehq.org/attachment.cgi?id=38531
OSS playground (C source)

Here's a simple test program I put together to test how OSS behaves.

I found the following:

1 kHz -> SKIP -> 200 Hz
The rest of the 1 kHz buffer plays out, then the 200 Hz tone starts. No silence
at all. This seems no different if the SKIP is omitted.

1 kHz -> HALT -> 200 Hz
The 1 kHz tone stops immediately, then the 200 Hz tone starts. No silence at
all.

1 kHz -> SILENCE -> 200 Hz
The 1 kHz tone stops immediately, then silence for the length of the buffer,
then the 200 Hz tone starts.

1 kHz -> sleep(2) -> 200 Hz
The 1kHz tone stops during the sleep, then some silence, then the 200 Hz tone
plays with no delay.

At no point did I observe the buffer to "wrap" and re-play old frames. As the
last test above shows, OSS4 handles underrun in the same was as MMDevAPI; it
just stops the device and restarts it immediately when data is written. No
recovery is required.

So I believe HALT is the only interesting command (SKIP appears to do nothing
at all, and we probably have no interest in inserting a buffer's length of
SILENCE).

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