output: new output plugin "ffado"

Using libffado, to play on firewire audio devices.

Warning: this plugin was not tested successfully.  I just couldn't
keep libffado2 from crashing.  Use at your own risk.

For details, see my Debian bug reports:

  http://bugs.debian.org/601657
  http://bugs.debian.org/601659

configure.ac

@@ -155,6 +155,10 @@ AC_ARG_ENABLE(documentation,
 		[build documentation (default: disable)]),,
 	[enable_documentation=no])
 
+AC_ARG_ENABLE(ffado,
+	AS_HELP_STRING([--enable-ffado], [enable libffado (FireWire) support]),,
+	[enable_ffado=auto])
+
 AC_ARG_ENABLE(ffmpeg,
 	AS_HELP_STRING([--enable-ffmpeg],
 		[enable FFMPEG support]),,
@@ -1205,6 +1209,17 @@ fi
 
 AM_CONDITIONAL(HAVE_ALSA, test x$enable_alsa = xyes)
 
+dnl ----------------------------------- FFADO ---------------------------------
+
+MPD_AUTO_PKG(ffado, FFADO, [libffado],
+	[libffado output plugin], [libffado not found])
+
+if test x$enable_ffado = xyes; then
+	AC_DEFINE(ENABLE_FFADO_OUTPUT, 1, [Define to enable the libffado output plugin])
+fi
+
+AM_CONDITIONAL(ENABLE_FFADO_OUTPUT, test x$enable_ffado = xyes)
+
 dnl ----------------------------------- FIFO ----------------------------------
 if test x$enable_fifo = xyes; then
 	AC_CHECK_FUNC([mkfifo],
@@ -1395,6 +1410,7 @@ dnl --------------------- Post Audio Output Plugins Tests ---------------------
 if
 	test x$enable_alsa = xno &&
 	test x$enable_ao = xno &&
+	test x$enable_ffado = xno &&
 	test x$enable_fifo = xno &&
 	test x$enable_httpd_output = xno &&
 	test x$enable_jack = xno &&
@@ -1529,6 +1545,7 @@ results(id3,[ID3])
 
 echo -en '\nPlayback support:\n\t'
 results(alsa,ALSA)
+results(ffado,FFADO)
 results(fifo,FIFO)
 results(recorder_output,[File Recorder])
 results(httpd_output,[HTTP Daemon])