Add support for pulseaudio backend

This work is done by Nikita Krupenko which sent a patch to
rdesktop in 2010 for version 1.6.0. I have now ported it
over to trunk and it seems to work as expected.

configure.ac

@@ -256,7 +256,7 @@ AC_DEFINE_UNQUOTED(EGD_SOCKET, "$EGD_SOCKET")
 
 sound="yes"
 AC_ARG_WITH(sound,
-    [  --with-sound            select sound system ("oss", "sgi", "sun", "alsa" or "libao") ],
+    [  --with-sound            select sound system ("oss", "sgi", "sun", "alsa", "pulse" or "libao") ],
     [ 
     sound="$withval" 
     ])
@@ -272,6 +272,7 @@ AC_ARG_ENABLE(static-libsamplerate,
 
 if test -n "$PKG_CONFIG"; then
     PKG_CHECK_MODULES(LIBAO, ao, [HAVE_LIBAO=1], [HAVE_LIBAO=0])
+    PKG_CHECK_MODULES(PULSE, libpulse, [HAVE_PULSE=1], [HAVE_PULSE=0])
     PKG_CHECK_MODULES(ALSA, alsa, [HAVE_ALSA=1], [HAVE_ALSA=0])
     PKG_CHECK_MODULES(LIBSAMPLERATE, samplerate, [HAVE_LIBSAMPLERATE=1], [HAVE_LIBSAMPLERATE=0])
     if test x"$HAVE_LIBSAMPLERATE" = "x1"; then
@@ -316,6 +317,13 @@ case $sound in
             AC_DEFINE(RDPSND_ALSA)
         fi
 
+        if test x"$HAVE_PULSE" = "x1"; then
+            SOUNDOBJ="$SOUNDOBJ rdpsnd_pulse.o"
+            CFLAGS="$CFLAGS $PULSE_CFLAGS"
+            LIBS="$LIBS $PULSE_LIBS"
+            AC_DEFINE(RDPSND_PULSE)
+        fi
+
         if test x"$HAVE_LIBAO" = "x1"; then
             SOUNDOBJ="$SOUNDOBJ rdpsnd_libao.o"
             CFLAGS="$CFLAGS $LIBAO_CFLAGS"
@@ -364,6 +372,17 @@ case $sound in
         fi
         ;;
 
+    pulse)
+        if test x"$HAVE_PULSE" = "x1"; then
+            SOUNDOBJ="$SOUNDOBJ rdpsnd_pulse.o"
+            CFLAGS="$CFLAGS $PULSE_CFLAGS"
+            LIBS="$LIBS $PULSE_LIBS"
+            AC_DEFINE(RDPSND_PULSE)
+        else
+            AC_MSG_ERROR([Selected sound system is not available.])
+        fi
+        ;;
+
     libao)
         if test x"$HAVE_LIBAO" = "x1"; then
             SOUNDOBJ="$SOUNDOBJ rdpsnd_libao.o"
@@ -380,7 +399,7 @@ case $sound in
 
     *)
         AC_MSG_WARN([sound support disabled])
-        AC_MSG_WARN([Currently supported systems are Open Sound System (oss), SGI AL (sgi), Sun/BSD (sun), ALSA (alsa) and libao])
+        AC_MSG_WARN([Currently supported systems are Open Sound System (oss), SGI AL (sgi), Sun/BSD (sun), ALSA (alsa), PulseAudio (pulse) and libao])
         ;;
 esac
 

rdpsnd.c

@@ -3,6 +3,7 @@
    Sound Channel Process Functions
    Copyright 2006-2010 Pierre Ossman <ossman@cendio.se> for Cendio AB
    Copyright 2009-2011 Peter Astrand <astrand@cendio.se> for Cendio AB
+   Copyright 2017 Henrik Andersson <hean01@cendio.se> for Cendio AB
    Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 2003-2008
    Copyright (C) GuoJunBo <guojunbo@ict.ac.cn> 2003
 
@@ -119,7 +120,7 @@ rdpsnd_auto_select(void)
 			       current_driver->name);
 			if (current_driver->wave_out_open())
 			{
-				logger(Sound, Debug, "rdpsnd_auto_select(), using driver '%s'",
+				logger(Sound, Verbose, "rdpsnd_auto_select(), using driver '%s'",
 				       current_driver->name);
 				current_driver->wave_out_close();
 				return True;
@@ -451,6 +452,11 @@ rdpsnd_register_drivers(char *options)
 	/* The order of registrations define the probe-order
 	   when opening the device for the first time */
 	reg = &drivers;
+#if defined(RDPSND_PULSE)
+	*reg = pulse_register(options);
+	assert(*reg);
+	reg = &((*reg)->next);
+#endif
 #if defined(RDPSND_ALSA)
 	*reg = alsa_register(options);
 	assert(*reg);

rdpsnd.h

@@ -52,6 +52,7 @@ struct audio_driver
 };
 
 /* Driver register functions */
+struct audio_driver *pulse_register(char *options);
 struct audio_driver *alsa_register(char *options);
 struct audio_driver *libao_register(char *options);
 struct audio_driver *oss_register(char *options);