Output: Add more setup and format error checking

Add setup error checking and failure states, and also add a failure
state for format changes while the device is already running, in case it
returns a nil format structure.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

Audio/AudioPlayer.m

@@ -79,7 +79,9 @@
 	}
 	if(!output) {
 		output = [[OutputNode alloc] initWithController:self previous:nil];
-		[output setupWithInterval:resumeInterval];
+		if(![output setupWithInterval:resumeInterval]) {
+			return;
+		}
 	}
 	[output setVolume:volume];
 	@synchronized(chainQueue) {

Audio/Chain/OutputNode.h

@@ -45,8 +45,8 @@
 
 - (double)secondsBuffered;
 
-- (void)setup;
-- (void)setupWithInterval:(BOOL)resumeInterval;
+- (BOOL)setup;
+- (BOOL)setupWithInterval:(BOOL)resumeInterval;
 - (void)process;
 - (void)close;
 - (void)seek:(double)time;

Audio/Chain/OutputNode.m

@@ -33,11 +33,11 @@
 	VisualizationNode *visualizationNode;
 }
 
-- (void)setup {
-	[self setupWithInterval:NO];
+- (BOOL)setup {
+	return [self setupWithInterval:NO];
 }
 
-- (void)setupWithInterval:(BOOL)resumeInterval {
+- (BOOL)setupWithInterval:(BOOL)resumeInterval {
 	if(!resumeInterval) {
 		amountPlayed = 0.0;
 		amountPlayedInterval = 0.0;
@@ -49,23 +49,26 @@
 
 	output = [[OutputCoreAudio alloc] initWithController:self];
 
-	[output setup];
+	if(![output setup]) {
+		output = nil;
+		return NO;
+	}
 
 	if(!DSPsLaunched) {
 		rubberbandNode = [[DSPRubberbandNode alloc] initWithController:self previous:nil latency:0.1];
-		if(!rubberbandNode) return;
+		if(!rubberbandNode) return NO;
 		fsurroundNode = [[DSPFSurroundNode alloc] initWithController:self previous:rubberbandNode latency:0.03];
-		if(!fsurroundNode) return;
+		if(!fsurroundNode) return NO;
 		equalizerNode = [[DSPEqualizerNode alloc] initWithController:self previous:fsurroundNode latency:0.03];
-		if(!equalizerNode) return;
+		if(!equalizerNode) return NO;
 		hrtfNode = [[DSPHRTFNode alloc] initWithController:self previous:equalizerNode latency:0.03];
-		if(!hrtfNode) return;
+		if(!hrtfNode) return NO;
 		downmixNode = [[DSPDownmixNode alloc] initWithController:self previous:hrtfNode latency:0.03];
-		if(!downmixNode) return;
+		if(!downmixNode) return NO;
 
 		// Approximately double the chunk size for Vis at 44100Hz
 		visualizationNode = [[VisualizationNode alloc] initWithController:self previous:downmixNode latency:8192.0 / 44100.0];
-		if(!visualizationNode) return;
+		if(!visualizationNode) return NO;
 
 		[self setPreviousNode:visualizationNode];
 
@@ -75,6 +78,8 @@
 
 		previousInput = nil;
 	}
+
+	return YES;
 }
 
 - (void)seek:(double)time {

Audio/Output/OutputCoreAudio.m

@@ -223,8 +223,12 @@ current_device_listener(AudioObjectID inObjectID, UInt32 inNumberAddresses, cons
 	while(!stopping) {
 		@autoreleasepool {
 			if(outputdevicechanged) {
-				[self updateDeviceFormat];
-				outputdevicechanged = NO;
+				if([self updateDeviceFormat]) {
+					outputdevicechanged = NO;
+				} else {
+					usleep(2000);
+					continue;
+				}
 			}
 
 			if([outputController shouldReset]) {
@@ -474,6 +478,9 @@ current_device_listener(AudioObjectID inObjectID, UInt32 inNumberAddresses, cons
 
 - (BOOL)updateDeviceFormat {
 	AVAudioFormat *format = _au.outputBusses[0].format;
+	if(!format) {
+		return NO;
+	}
 
 	if(!_deviceFormat || ![_deviceFormat isEqual:format]) {
 		NSError *err;
@@ -805,7 +812,9 @@ current_device_listener(AudioObjectID inObjectID, UInt32 inNumberAddresses, cons
 
 		[_au allocateRenderResourcesAndReturnError:&err];
 
-		[self updateDeviceFormat];
+		if(![self updateDeviceFormat]) {
+			return NO;
+		}
 
 		visController = [VisualizationController sharedController];