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and add a missing one

Close #12753

Thanks to Ruito

The same caveats apply as for Windows legacy (and ALSA) outputs:
- Change latency is high and noticeable.
- Change between less than 100% and more than 100% occurs in two steps.
- Non-linear formats are not supported at all.
- Integer formats are prone to clipping/saturation.
- Floating formats may hit Windows peak protection, sounding awful.
In other words, it does not work properly and it never will. This will
be removed once minimum and maximum volumes are exposed properly.

As meager consolation, there are two advantages over endpoint volume:
- The code is much simpler.
- Other audio sessions are not affected.

This reverts commit c4d74ccf.
This caused interferences with other audio sessions and violated the
audio volume guidelines from Microsoft.

Conflicts:
	modules/audio_output/mmdevice.c

Regression from 3044105e.

Brion Vibber authored Nov 10, 2014 and Felix Paul Kühne committed Nov 11, 2014

This gets quoted later, so don't quote it first.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

Tristan Matthews authored Nov 10, 2014 and Tristan Matthews committed Nov 11, 2014

This makes it a little more obvious, instead of just saying that tools
are missing or too old.

Close #12744

Thanks to Ruito

Only start and stop media key support when needed (ressource-intensive).

close #12423

KO Myung-Hun authored Nov 05, 2014 and Jean-Baptiste Kempf committed Nov 10, 2014

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Sean McGovern authored Nov 10, 2014 and Tristan Matthews committed Nov 10, 2014

Signed-off-by: Tristan Matthews <tmatth@videolan.org>

And drop all unused and useless code

Gets rid of the checkless and expecting in-order data
read functions.