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audio: move replaygain control to top-level options

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af_volume is deprecated, and so are its replaygain sub-options. To make
it possible to use replaygain without deprecated options (and of course
to make it available at all after af_volume is dropped), reintroduce
them as top-level options.

This also means that they are easily changeable at runtime by using them
as properties. Change the "volume" property to use the new update
mechanism as well.

We don't actually bother sharing the implementation between new and
deprecated mechanisms, as the deprecated one will simply be deleted.

For the from_dB() functions, we mention anders' copyright, although I'm
not sure if a mere formula is copyrightable. This will have to be
determined later.

This whole change is mostly untested. Our distributed human CI will take
care of it.
This commit is contained in:
wm4
2017-04-26 21:45:50 +02:00
parent 010c7d4992
commit f1c4d20e65
8 changed files with 92 additions and 7 deletions
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DOCS/man/af.rst
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@@ -208,6 +208,9 @@ Available filters are:
best to use the *Master* volume control of your sound card or the volume
knob on your amplifier.
*WARNING*: This filter is deprecated. Use the top-level options like
``--volume`` and ``--replaygain...`` instead.
*NOTE*: This filter is not reentrant and can therefore only be enabled
once for every audio stream.