Removed alsa backend for now

INSTALL.md

@@ -40,12 +40,11 @@ __Notes__:
 apt-get install build-essential cmake libboost-program-options-dev libboost-system-dev libavutil-dev libavformat-dev libswresample-dev ffmpeg libconfig++-dev libstb-dev libtag-dev libpugixml-dev libgtest-dev libarchive-dev libxxhash-dev libssl-dev
 ```
 __Optional dependencies__:
-* libpam0g-dev, used to handle PAM authentication
-* libpulse-dev, used to output audio using PulseAudio
-* libasound2-dev, used to output audio using ALSA
+* `libpam0g-dev`: used to handle PAM authentication
+* `libpulse-dev`: used to output audio via PulseAudio in jukebox mode
 
 __Notes__:
-* libstb-dev can be replaced by libgraphicsmagick++1-dev (the latter will likely use more RAM)
+* `libstb-dev` can be replaced by `libgraphicsmagick++1-dev` (the latter will likely use more RAM)
 You also need _Wt4_, which is not packaged on _Debian_. See [installation instructions](https://www.webtoolkit.eu/wt/doc/reference/html/InstallationUnix.html).</br>
 ### Build
 Get the latest stable release and build it:

conf/lms.conf

@@ -145,5 +145,5 @@ ui-playqueue-max-entry-count = 1000;
 ui-allow-downloads = true;
 
 # Jukebox settings
-# Available backends are "alsa", "pulseaudio". You can also use "auto" to auto select and "none" to disable jukebox
+# Available backend is "pulseaudio". You can also use "auto" to auto select and "none" to disable jukebox
 jukebox-audio-backend = "auto";

src/libs/audio/impl/AudioOutput.cpp

@@ -37,8 +37,6 @@ namespace lms::audio
         case AudioOutputBackend::Auto:
 #if LMS_HAVE_PULSEAUDIO
             context = std::make_unique<pulseaudio::AudioOutputContext>(ioContext, name);
-#elif LMS_HAVE_ALSA
-            context = std::make_unique<alsa::AudioOutputContext>(ioContext, name);
 #endif
             break;
 

src/lms/main.cpp

@@ -100,8 +100,6 @@ namespace lms
         {
             std::string_view backend{ core::Service<core::IConfig>::get()->getString("jukebox-audio-backend", "auto") };
 
-            if (backend == "alsa")
-                return audio::AudioOutputBackend::ALSA;
             if (backend == "pulseaudio")
                 return audio::AudioOutputBackend::PulseAudio;
             if (backend == "auto")