These were disabled by accident.

We'll have some code for it soon.

Hook for src_reset(), not yet used.

Move this sample rate fixup from the ALSA output plugin to PcmExport,
where it belongs.

DSD_U32 packs four bytes instead of one large "sample", thus the
sample rate is one quarter of the input sample rate.  This fixes a
rather critical DSD_U32 playback problem.

Prepare for DSD sample rate fixups.

https://bugs.musicpd.org/view.php?id=3876

Call SeekDone() to avoid the freeze bug.

libcurl's WRITEFUNCTION is pretty fragile; if we destroy the CURL*
instance or even unregister it using curl_multi_remove_handle(),
libcurl will crash instantly.  But still we need to be able to handle
exceptions from inside the WRITEFUNCTION, and call
CurlResponseHandler::OnError(), which may destroy the whole thing.  As
a workaround, I use DeferredMonitor to postpone the OnError() call
into a stack frame which is allowed to destroy the request.

Let the caller decide what to do with the exception.

When the request is done, only unregister the CURL* handle, but do not
delete it yet - it may still be needed for CURLINFO_RESPONSE_CODE.

Convert assertion to runtime check.  This is useful because this is a
public method, and the caller has no chance to check if the object is
still registered.

Fixes a crash that can occur due to recursion from InvalidateSockets()
to ReadInfo() to CurlRequest callbacks.

Move code from SongFilter.cxx.

Changed AlsaMixerPlugin to use the get and set normalized functions from volume_mapping of alsa-utils/alsamixer
Changed volume_mapping set volume to be for all channels and not per channel
added volume_mapping files to Makefile.am