[Audio Output] Fix serious deadlock issue

There was a serious deadlock issue. Now it is fixed. Whew.

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

Audio/AudioPlayer.m

@@ -62,6 +62,7 @@
 	[self waitUntilCallbacksExit];
 	if(output) {
 		[output setShouldContinue:NO];
+		[output close];
 	}
 	if(!output) {
 		output = [[OutputNode alloc] initWithController:self previous:nil];
@@ -136,6 +137,7 @@
 	}
 	if(output) {
 		[output setShouldContinue:NO];
+		[output close];
 	}
 	output = nil;
 }

Audio/Chain/OutputNode.m

@@ -156,10 +156,6 @@
 }
 
 - (void)setShouldContinue:(BOOL)s {
-	if(output && !s) {
-		[output stop];
-	}
-
 	[super setShouldContinue:s];
 
 	//	if (s == NO)

Audio/Output/OutputAVFoundation.m

@@ -301,7 +301,9 @@ current_device_listener(AudioObjectID inObjectID, UInt32 inNumberAddresses, cons
 }
 
 - (BOOL)signalEndOfStream:(double)latency {
+	stopped = YES;
 	BOOL ret = [outputController selectNextBuffer];
+	stopped = ret;
 	dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(NSEC_PER_SEC * latency)), dispatch_get_main_queue(), ^{
 		[self->outputController endOfInputPlayed];
 		[self->outputController resetAmountPlayed];
@@ -1009,9 +1011,7 @@ current_device_listener(AudioObjectID inObjectID, UInt32 inNumberAddresses, cons
 
 - (void)doStop {
 	if(stopInvoked) {
-		while(!stopCompleted) {
-			usleep(5000);
-		}
+		stopFlush = NO;
 		return;
 	}
 	@synchronized(self) {
@@ -1060,7 +1060,7 @@ current_device_listener(AudioObjectID inObjectID, UInt32 inNumberAddresses, cons
 						compareVal = CMTimeCompare(outputPts, currentPts);
 						[currentPtsLock unlock];
 						usleep(5000);
-					} while(compareVal > 0);
+					} while(stopFlush && compareVal > 0);
 				}
 				[self removeSynchronizerBlock];
 				[renderSynchronizer setRate:0];