output/Internal: add various trivial getter methods

src/mixer/MixerAll.cxx

@@ -45,7 +45,7 @@ output_mixer_get_volume(const AudioOutput &ao)
 	} catch (const std::runtime_error &e) {
 		FormatError(e,
 			    "Failed to read mixer for '%s'",
-			    ao.name);
+			    ao.GetName());
 		return -1;
 	}
 }
@@ -88,7 +88,7 @@ output_mixer_set_volume(AudioOutput &ao, unsigned volume)
 	} catch (const std::runtime_error &e) {
 		FormatError(e,
 			    "Failed to set mixer for '%s'",
-			    ao.name);
+			    ao.GetName());
 		return false;
 	}
 }

src/output/Finish.cxx

@@ -42,7 +42,7 @@ AudioOutput::~AudioOutput()
 void
 audio_output_free(AudioOutput *ao)
 {
-	assert(!ao->open);
+	assert(!ao->IsOpen());
 	assert(!ao->fail_timer.IsDefined());
 	assert(!ao->thread.IsDefined());
 

src/output/Internal.hxx

@@ -288,14 +288,38 @@ public:
 	void BeginDestroy();
 	void FinishDestroy();
 
+	const char *GetName() const {
+		return name;
+	}
+
+	/**
+	 * Caller must lock the mutex.
+	 */
+	bool IsEnabled() const {
+		return enabled;
+	}
+
+	/**
+	 * Caller must lock the mutex.
+	 */
 	bool IsOpen() const {
 		return open;
 	}
 
+	/**
+	 * Caller must lock the mutex.
+	 */
 	bool IsCommandFinished() const {
 		return command == Command::NONE;
 	}
 
+	/**
+	 * Caller must lock the mutex.
+	 */
+	const std::exception_ptr &GetLastError() const {
+		return last_error;
+	}
+
 	/**
 	 * Waits for command completion.
 	 *

src/output/MultipleOutputs.cxx

@@ -76,9 +76,9 @@ MultipleOutputs::Configure(EventLoop &event_loop,
 		auto output = LoadOutput(event_loop, replay_gain_config,
 					 mixer_listener,
 					 client, *param);
-		if (FindByName(output->name) != nullptr)
+		if (FindByName(output->GetName()) != nullptr)
 			throw FormatRuntimeError("output devices with identical "
-						 "names: %s", output->name);
+						 "names: %s", output->GetName());
 
 		outputs.push_back(output);
 	}
@@ -97,7 +97,7 @@ AudioOutput *
 MultipleOutputs::FindByName(const char *name) const
 {
 	for (auto i : outputs)
-		if (strcmp(i->name, name) == 0)
+		if (strcmp(i->GetName(), name) == 0)
 			return i;
 
 	return nullptr;
@@ -217,13 +217,13 @@ MultipleOutputs::Open(const AudioFormat audio_format,
 	for (auto ao : outputs) {
 		const ScopeLock lock(ao->mutex);
 
-		if (ao->enabled)
+		if (ao->IsEnabled())
 			enabled = true;
 
-		if (ao->open)
+		if (ao->IsOpen())
 			ret = true;
-		else if (ao->last_error && !first_error)
+		else if (!first_error)
-			first_error = ao->last_error;
+			first_error = ao->GetLastError();
 	}
 
 	if (!enabled) {
@@ -265,7 +265,7 @@ MultipleOutputs::ClearTailChunk(const MusicChunk *chunk,
 		/* this mutex will be unlocked by the caller when it's
 		   ready */
 		ao->mutex.lock();
-		locked[i] = ao->open;
+		locked[i] = ao->IsOpen();
 
 		if (!locked[i]) {
 			ao->mutex.unlock();

src/output/OutputPrint.cxx

@@ -37,6 +37,6 @@ printAudioDevices(Response &r, const MultipleOutputs &outputs)
 		r.Format("outputid: %i\n"
 			 "outputname: %s\n"
 			 "outputenabled: %i\n",
-			 i, ao.name, ao.enabled);
+			 i, ao.GetName(), ao.IsEnabled());
 	}
 }

src/output/OutputState.cxx

@@ -45,7 +45,8 @@ audio_output_state_save(BufferedOutputStream &os,
 		const AudioOutput &ao = outputs.Get(i);
 		const ScopeLock lock(ao.mutex);
 
-		os.Format(AUDIO_DEVICE_STATE "%d:%s\n", ao.enabled, ao.name);
+		os.Format(AUDIO_DEVICE_STATE "%d:%s\n",
+			  ao.IsEnabled(), ao.GetName());
 	}
 }