[pipewire] Add support for pipewire as audio output

configure.ac

@@ -295,6 +295,11 @@ OWNTONE_ARG_WITH_CHECK([OWNTONE_OPTS], [Pulseaudio support], [pulseaudio], [LIBP
 	[AC_CHECK_FUNCS([pa_threaded_mainloop_set_name])])
 AM_CONDITIONAL([COND_PULSEAUDIO], [[test "x$with_pulseaudio" = "xyes"]])
 
+dnl PIPEWIRE
+OWNTONE_ARG_WITH_CHECK([OWNTONE_OPTS], [Pipewire support], [pipewire], [PIPEWIRE],
+        [libpipewire-0.3], [pw_stream_new], [pipewire/pipewire.h])
+AM_CONDITIONAL([COND_PIPEWIRE], [[test "x$with_pipewire" = "xyes"]])
+
 dnl Build with libwebsockets
 OWNTONE_ARG_WITH_CHECK([OWNTONE_OPTS], [libwebsockets support], [libwebsockets], [LIBWEBSOCKETS],
 	[libwebsockets >= 2.0.2])

src/Makefile.am

@@ -37,6 +37,10 @@ if COND_PULSEAUDIO
 PULSEAUDIO_SRC=outputs/pulse.c
 endif
 
+if COND_PIPEWIRE
+PIPEWIRE_SRC=outputs/pipewire.c
+endif
+
 if COND_AVAHI
 MDNS_SRC=mdns_avahi.c
 else
@@ -123,7 +127,7 @@ owntone_SOURCES = main.c \
 	outputs/airplay_events.c outputs/airplay_events.h \
 	outputs/streaming.c \
 	outputs/dummy.c outputs/fifo.c outputs/rcp.c \
-	$(ALSA_SRC) $(PULSEAUDIO_SRC) $(CHROMECAST_SRC) \
+    $(ALSA_SRC) $(PULSEAUDIO_SRC) $(PIPEWIRE_SRC) $(CHROMECAST_SRC) \
 	evrtsp/rtsp.c evrtsp/evrtsp.h evrtsp/rtsp-internal.h evrtsp/log.h \
 	evthr.c evthr.h \
 	$(SPOTIFY_SRC) \

src/outputs.c

@@ -52,6 +52,9 @@ extern struct output_definition output_alsa;
 #ifdef HAVE_LIBPULSE
 extern struct output_definition output_pulse;
 #endif
+#ifdef HAVE_PIPEWIRE
+extern struct output_definition output_pipewire;
+#endif
 #ifdef CHROMECAST
 extern struct output_definition output_cast;
 #endif
@@ -73,6 +76,9 @@ static struct output_definition *outputs[] = {
 #ifdef HAVE_LIBPULSE
     &output_pulse,
 #endif
+#ifdef HAVE_PIPEWIRE
+    &output_pipewire,
+#endif
 #ifdef CHROMECAST
     &output_cast,
 #endif

src/outputs.h

@@ -64,6 +64,9 @@ enum output_types
 #ifdef HAVE_LIBPULSE
   OUTPUT_TYPE_PULSE,
 #endif
+#ifdef HAVE_PIPEWIRE
+  OUTPUT_TYPE_PIPEWIRE,
+#endif
 #ifdef CHROMECAST
   OUTPUT_TYPE_CAST,
 #endif