OutputInit: allow "init" to throw exception

src/output/Internal.hxx

@@ -454,6 +454,9 @@ private:
  */
 extern struct notify audio_output_client_notify;
 
+/**
+ * Throws #std::runtime_error on error.
+ */
 AudioOutput *
 audio_output_new(EventLoop &event_loop, const ConfigBlock &block,
 		 MixerListener &mixer_listener,

src/output/MultipleOutputs.cxx

@@ -32,6 +32,8 @@
 #include "config/ConfigOption.hxx"
 #include "notify.hxx"
 
+#include <stdexcept>
+
 #include <assert.h>
 #include <string.h>
 
@@ -51,7 +53,7 @@ MultipleOutputs::~MultipleOutputs()
 static AudioOutput *
 LoadOutput(EventLoop &event_loop, MixerListener &mixer_listener,
 	   PlayerControl &pc, const ConfigBlock &block)
-{
+try {
 	Error error;
 	AudioOutput *output = audio_output_new(event_loop, block,
 					       mixer_listener,
@@ -66,6 +68,13 @@ LoadOutput(EventLoop &event_loop, MixerListener &mixer_listener,
 	}
 
 	return output;
+} catch (const std::runtime_error &e) {
+	if (block.line > 0)
+		FormatFatalError("line %i: %s",
+				 block.line,
+				 e.what());
+	else
+		FatalError(e.what());
 }
 
 void

src/output/OutputPlugin.hxx

@@ -50,6 +50,8 @@ struct AudioOutputPlugin {
 	 * Configure and initialize the device, but do not open it
 	 * yet.
 	 *
+	 * Throws #std::runtime_error on error.
+	 *
 	 * @param param the configuration section, or nullptr if there is
 	 * no configuration
 	 * @return nullptr on error, or an opaque pointer to the plugin's