This fork — macOS sleep/wake & stream-stall hardening

A fork of ralph-irving/squeezelite hardened for running as a background service on macOS (PortAudio/CoreAudio). It fixes a silent failure where the audio output stalls after the Mac sleeps/wakes or a USB DAC re-enumerates — the SlimProto control connection reconnects fine, but samples stop flowing, the player's playPoint freezes, and the server loops on nextChunk: Waiting for queue to drain until LMS itself becomes unresponsive.

Added (all isolated behind #if OSX / #if PORTAUDIO; ALSA/Linux and the SlimProto/sync paths are unchanged):

• Output stall watchdog — reopens the output device if no samples are written for a configurable timeout. New flag -k <seconds> (default 5, 0 disables).
• Native sleep/wake detection (IOKit) — proactively reopens the stream on wake.
• CoreAudio device-list handling — rebinds when the output device disappears/reappears.
• Loud, greppable recovery logging, plus kill -USR1 <pid> to force a reopen for testing.

Build on macOS (Homebrew)

The stock Makefile.osx / Makefile.m1 need bundled static libs and a full Xcode SDK. On a typical Mac, build against Homebrew libraries with Makefile.brew:

brew install portaudio flac libvorbis libogg opus opusfile mpg123 faad2 libsoxr ffmpeg openssl@3
make -f Makefile.brew          # -> ./squeezelite
make test                      # run the watchdog unit tests

Install those libraries explicitly (as above): brew autoremove will otherwise delete codec libs that are only present as orphaned dependencies and break the dynamically linked binary.

See CLAUDE.md for the full design, log-line reference, and the manual sleep/wake test procedure.

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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.

Additional permission under GNU GPL version 3 section 7

If you modify this program, or any covered work, by linking or combining it with OpenSSL (or a modified version of that library), containing parts covered by the terms of The OpenSSL Project, the licensors of this program grant you additional permission to convey the resulting work. {Corresponding source for a non-source form of such a combination shall include the source code for the parts of OpenSSL used as well as that of the covered work.}

Contains dsd2pcm library Copyright 2009, 2011 Sebastian Gesemann which
is subject to its own license.

Contains the Daphile Project full dsd patch Copyright 2013-2017 Daphile,
which is subject to its own license.

Option to allow server side upsampling for PCM streams (-W) from
squeezelite-R2 (c) Marco Curti 2015, marcoc1712@gmail.com.

This software uses libraries from the FFmpeg project under
the LGPLv2.1 and its source can be downloaded from
https://sourceforge.net/projects/lmsclients/files/source/