[Bug 39709] New: winmm:mci makes a buzzing sound

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39709

            Bug ID: 39709
           Summary: winmm:mci makes a buzzing sound
           Product: Wine
           Version: 1.8-rc2
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: winmm&mci
          Assignee: wine-bugs at winehq.org
          Reporter: fgouget at codeweavers.com
      Distribution: ---

Running winmm:mci makes a buzzing sound. The first line (of many) where this
happens is the line below from test_playWAVE():

    /* A second play caused Wine<1.1.33 to hang */
    err = mciSendStringA("play mysound from 500 to 220:5:0 wait", NULL, 0,
NULL);

This is because the test records sound to tempfile.wav before playing it back.
So if the recording levels are set a bit high tempfile.wav can record
electrical noise, the buzzing sound, and thus makes noise when playing it back.

This is confirmed by changing the recording level in the KDE mixer prior to
running the test:
 * Setting it all the way down avoids the buzzing sound.
 * Setting it even moderately high causes the buzzing sound.

Conformance tests are supposed to not make noises when not run in interactive
mode so this should be fixed. I see two ways for this:
 * Set and restore the recording level in test_recordWAVE().
 * Create tempfile.wav by hand instead of relying on the output of
test_recordWAVE().

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