[client 1/3] build-sys: Allow simultaneous support for Pulse and GStreamer audio

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Rather than GStreamer/PulseAudio backend being mutually exclusive at
compile-time, this commit allows to enable both at the same time.
PulseAudio will then be favoured, with a fallback to GStreamer if it's
not available.
Note that --with-audio is kept for backward compatibility.

Signed-off-by: Francois Gouget <fgouget@xxxxxxxxxxxxxxx>
---
 configure.ac      | 71 +++++++++++++++++++++++++++++--------------------------
 src/Makefile.am   |  4 ++--
 src/spice-audio.c | 11 +++++----
 3 files changed, 46 insertions(+), 40 deletions(-)

diff --git a/configure.ac b/configure.ac
index dea9a30..734b73c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -292,49 +292,53 @@ AS_IF([test "x$have_phodav" = "xyes"],
 AM_CONDITIONAL([WITH_PHODAV], [test "x$have_phodav" = "xyes"])
 
 AC_ARG_WITH([audio],
-  AS_HELP_STRING([--with-audio=@<:@gstreamer/pulse/auto/no@:>@], [Select audio backend @<:@default=auto@:>@]),
-  [],
-  [with_audio="auto"])
-
-case "$with_audio" in
-  gstreamer|pulse|auto*)
-    PKG_CHECK_MODULES(GSTAUDIO, gstreamer-1.0 gstreamer-base-1.0 gstreamer-app-1.0 gstreamer-audio-1.0, [have_gstaudio=yes], [have_gstaudio=no])
-    PKG_CHECK_MODULES(PULSE, libpulse libpulse-mainloop-glib, [have_pulse=yes], [have_pulse=no])
-    ;;
-  no*)
-    ;;
-  *) AC_MSG_ERROR(Unsupported audio backend)
-esac
-
-AS_IF([test "x$with_audio" = "xauto" && test "x$have_pulse" = "xyes"],
-      [with_audio=pulse])
-
-AS_IF([test "x$with_audio" = "xauto" && test "x$have_gstaudio" = "xyes"],
-      [with_audio=gstreamer])
-
-AS_IF([test "x$with_audio" = "xauto"],
-      [with_audio=no])
+  AS_HELP_STRING([--with-audio=@<:@gstreamer/pulse/auto/no@:>@], [For legacy compatibility only]),
+  [SPICE_WARNING([--with-audio is deprecated. Use --enable-pulse and/or --enable-gstaudio instead])
+   case "$with_audio" in
+   pulse)     enable_pulse="yes"; enable_gstaudio="no" ;;
+   gstreamer) enable_pulse="no";  enable_gstaudio="yes" ;;
+   no)        enable_pulse="no";  enable_gstaudio="no" ;;
+   esac
+])
 
-AS_IF([test "x$with_audio" = "xpulse"],
-      [AS_IF([test "x$have_pulse" = "xyes"],
-             [AC_DEFINE([WITH_PULSE], 1, [Have pulseaudio?])],
-             [AC_MSG_ERROR([PulseAudio requested but not found])
+AC_ARG_ENABLE([pulse],
+  AS_HELP_STRING([--enable-pulse=@<:@yes/auto/no@:>@], [Enable the PulseAudio backend @<:@default=auto@:>@]),
+  [],
+  [enable_pulse="auto"])
+AS_IF([test "x$enable_pulse" != "xno"],
+      [PKG_CHECK_MODULES(PULSE, [libpulse libpulse-mainloop-glib],
+         [AC_DEFINE([HAVE_PULSE], 1, [Have PulseAudio support?])
+          enable_pulse="yes"],
+         [AS_IF([test "x$enable_pulse" = "xyes"],
+                AC_MSG_ERROR([PulseAudio requested but not found]))
+          enable_pulse="no"
       ])
 ])
-AM_CONDITIONAL([WITH_PULSE], [test "x$have_pulse" = "xyes"])
+AM_CONDITIONAL([SUPPORT_PULSE], [test "x$enable_pulse" = "xyes"])
 AC_SUBST(PULSE_CFLAGS)
 AC_SUBST(PULSE_LIBS)
 
-AS_IF([test "x$with_audio" = "xgstreamer"],
-      [AS_IF([test "x$have_gstaudio" = "xyes"],
-             [AC_DEFINE([WITH_GSTAUDIO], 1, [Have GStreamer 1.0 audio?])],
-             [AC_MSG_ERROR([GStreamer 1.0 audio requested but not found])
+AC_ARG_ENABLE([gstaudio],
+  AS_HELP_STRING([--enable-gstaudio=@<:@yes/auto/no@:>@], [Enable the GStreamer 1.0 audio backend @<:@default=auto@:>@]),
+  [],
+  [enable_gstaudio="auto"])
+AS_IF([test "x$enable_gstaudio" != "xno"],
+      [PKG_CHECK_MODULES(GSTAUDIO, [gstreamer-1.0 gstreamer-base-1.0 gstreamer-app-1.0 gstreamer-audio-1.0],
+         [AC_DEFINE([HAVE_GSTAUDIO], 1, [Have GStreamer 1.0 audio support?])
+          enable_gstaudio="yes"],
+         [AS_IF([test "x$enable_gstaudio" = "xyes"],
+                AC_MSG_ERROR([GStreamer 1.0 audio requested but not found]))
+          enable_gstaudio="no"
       ])
 ])
-AM_CONDITIONAL([WITH_GSTAUDIO], [test "x$have_gstaudio" = "xyes"])
+AM_CONDITIONAL([SUPPORT_GSTAUDIO], [test "x$enable_gstaudio" = "xyes"])
 AC_SUBST(GSTAUDIO_CFLAGS)
 AC_SUBST(GSTAUDIO_LIBS)
 
+AS_IF([test "x$enable_pulse$enable_gstaudio" = "xnono"],
+      [SPICE_WARNING([No PulseAudio or GStreamer 1.0 audio decoder, audio will not be streamed])
+])
+
 AC_CHECK_LIB(jpeg, jpeg_destroy_decompress,
     AC_MSG_CHECKING([for jpeglib.h])
     AC_TRY_CPP(
@@ -741,7 +745,8 @@ AC_MSG_NOTICE([
 
         Gtk:                      ${with_gtk}
         Coroutine:                ${with_coroutine}
-        Audio:                    ${with_audio}
+        PulseAudio:               ${enable_pulse}
+        GStreamer Audio:          ${enable_gstaudio}
         SASL support:             ${enable_sasl}
         Smartcard support:        ${have_smartcard}
         USB redirection support:  ${have_usbredir} ${with_usbredir_hotplug}
diff --git a/src/Makefile.am b/src/Makefile.am
index 99a8a1f..af95562 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -330,14 +330,14 @@ dist_libspice_client_glibinclude_DATA =	\
 	spice-channel-enums.h		\
 	$(NULL)
 
-if WITH_PULSE
+if SUPPORT_PULSE
 libspice_client_glib_2_0_la_SOURCES +=	\
 	spice-pulse.c			\
 	spice-pulse.h			\
 	$(NULL)
 endif
 
-if WITH_GSTAUDIO
+if SUPPORT_GSTAUDIO
 libspice_client_glib_2_0_la_SOURCES +=	\
 	spice-gstaudio.c		\
 	spice-gstaudio.h		\
diff --git a/src/spice-audio.c b/src/spice-audio.c
index 75742d7..550d02a 100644
--- a/src/spice-audio.c
+++ b/src/spice-audio.c
@@ -42,10 +42,10 @@
 #include "spice-channel-priv.h"
 #include "spice-audio-priv.h"
 
-#ifdef WITH_PULSE
+#ifdef HAVE_PULSE
 #include "spice-pulse.h"
 #endif
-#if defined(WITH_GSTAUDIO)
+#ifdef HAVE_GST_AUDIO
 #include "spice-gstaudio.h"
 #endif
 
@@ -261,11 +261,12 @@ SpiceAudio *spice_audio_new(SpiceSession *session, GMainContext *context,
     if (name == NULL)
         name = g_get_application_name();
 
-#ifdef WITH_PULSE
+#ifdef HAVE_PULSE
     self = SPICE_AUDIO(spice_pulse_new(session, context, name));
 #endif
-#if defined(WITH_GSTAUDIO)
-    self = SPICE_AUDIO(spice_gstaudio_new(session, context, name));
+#ifdef HAVE_GST_AUDIO
+    if (!self)
+        self = SPICE_AUDIO(spice_gstaudio_new(session, context, name));
 #endif
     if (!self)
         return NULL;
-- 
2.6.2

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