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Attempted to resolve risk of an audio callback being in progress when -dealloc is received.

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This commit is contained in:
Thomas Harte 2017-02-22 21:12:59 -05:00
parent 6120dae61a
commit 4c947ad553
1 changed files with 15 additions and 2 deletions
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17
OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m
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@ -12,6 +12,8 @@
#define AudioQueueBufferMaxLength 8192
#define NumberOfStoredAudioQueueBuffer 16
static NSLock *CSAudioQueueDeallocLock;
@implementation CSAudioQueue
{
AudioQueueRef _audioQueue;
@ -45,7 +47,11 @@ static void audioOutputCallback(
AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer)
{
[(__bridge CSAudioQueue *)inUserData audioQueue:inAQ didCallbackWithBuffer:inBuffer];
if([CSAudioQueueDeallocLock tryLock])
{
[(__bridge CSAudioQueue *)inUserData audioQueue:inAQ didCallbackWithBuffer:inBuffer];
[CSAudioQueueDeallocLock unlock];
}
}
#pragma mark - Standard object lifecycle
@ -56,6 +62,11 @@ static void audioOutputCallback(
if(self)
{
if(!CSAudioQueueDeallocLock)
{
CSAudioQueueDeallocLock = [[NSLock alloc] init];
}
_samplingRate = samplingRate;
// determine preferred buffer sizes
@ -104,7 +115,9 @@ static void audioOutputCallback(
- (void)dealloc
{
if(_audioQueue) AudioQueueDispose(_audioQueue, YES);
[CSAudioQueueDeallocLock lock];
if(_audioQueue) AudioQueueDispose(_audioQueue, true);
[CSAudioQueueDeallocLock unlock];
}
#pragma mark - Audio enqueuer