From 5a808d789ac9901fce2d0651242138562bdad3fa Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Tue, 18 Oct 2016 22:21:34 -0400
Subject: [PATCH] Added an upper threshold that must be crossed before a lower
 threshold warning is communicated.

---
 OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m b/OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m
index 2e1ef29e1..a99fdf3b5 100644
--- a/OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m	
+++ b/OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m	
@@ -15,6 +15,7 @@
 {
 	AudioQueueRef _audioQueue;
 	size_t _queuedSamples;
+	BOOL _hasHad256;
 }
 
 #pragma mark - AudioQueue callbacks
@@ -22,7 +23,11 @@
 - (void)audioQueue:(AudioQueueRef)theAudioQueue didCallbackWithBuffer:(AudioQueueBufferRef)buffer
 {
 	size_t samplesInBuffer = (size_t)(buffer->mAudioDataByteSize / sizeof(int16_t));
-	if(_queuedSamples >= 128 && _queuedSamples  - samplesInBuffer < 128) [self.delegate audioQueueIsRunningDry:self];
+	if(_queuedSamples >= 128 && _queuedSamples  - samplesInBuffer < 128 && _hasHad256)
+	{
+		_hasHad256 = NO;
+		[self.delegate audioQueueIsRunningDry:self];
+	}
 	_queuedSamples -= samplesInBuffer;
 
 	AudioQueueFreeBuffer(_audioQueue, buffer);
@@ -102,6 +107,7 @@ static void audioOutputCallback(
 	AudioQueueBufferRef newBuffer;
 	size_t bufferBytes = lengthInSamples * sizeof(int16_t);
 	_queuedSamples += lengthInSamples;
+	_hasHad256 |= (_queuedSamples >= 256);
 
 	AudioQueueAllocateBuffer(_audioQueue, (UInt32)bufferBytes, &newBuffer);
 	memcpy(newBuffer->mAudioData, buffer, bufferBytes);