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Attempt to get a bit more rigorous in diagnosing queue stoppages.

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This commit is contained in:
Thomas Harte 2022-07-12 21:43:33 -04:00
parent 1c537a877e
commit b7ad94c676
1 changed files with 35 additions and 31 deletions
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66
OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m
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@ -12,44 +12,36 @@
#define AudioQueueBufferMaxLength 8192
#define OSSGuard(x) { \
const OSStatus status = x; \
assert(!status); \
(void)status; \
}
#define IsDry(x) (x) < 3
@implementation CSAudioQueue {
AudioQueueRef _audioQueue;
NSLock *_deallocLock;
NSLock *_queueLock;
atomic_int _enqueuedBuffers;
}
#pragma mark - AudioQueue callbacks
/*!
@returns @c YES if the queue is running dry; @c NO otherwise.
*/
- (BOOL)audioQueue:(AudioQueueRef)theAudioQueue didCallbackWithBuffer:(AudioQueueBufferRef)buffer {
const int buffers = atomic_fetch_add(&_enqueuedBuffers, -1);
// If that suggests the queue may be exhausted soon, re-enqueue whatever just came back in order to
// keep the queue going. AudioQueues seem to stop playing and never restart no matter how much
// encouragement if exhausted.
if(!buffers) {
AudioQueueEnqueueBuffer(theAudioQueue, buffer, 0, NULL);
atomic_fetch_add(&_enqueuedBuffers, 1);
} else {
AudioQueueFreeBuffer(_audioQueue, buffer);
}
return YES;
}
#pragma mark - Status
- (BOOL)isRunningDry {
return atomic_load_explicit(&_enqueuedBuffers, memory_order_relaxed) < 3;
return IsDry(atomic_load_explicit(&_enqueuedBuffers, memory_order_relaxed));
}
#pragma mark - Standard object lifecycle
#pragma mark - Object lifecycle
- (instancetype)initWithSamplingRate:(Float64)samplingRate isStereo:(BOOL)isStereo {
self = [super init];
if(self) {
_deallocLock = [[NSLock alloc] init];
_queueLock = [[NSLock alloc] init];
atomic_store_explicit(&_enqueuedBuffers, 0, memory_order_relaxed);
_samplingRate = samplingRate;
@ -87,13 +79,21 @@
}
if([queue->_deallocLock tryLock]) {
BOOL isRunningDry = NO;
isRunningDry = [queue audioQueue:inAQ didCallbackWithBuffer:inBuffer];
[queue->_queueLock lock];
OSSGuard(AudioQueueFreeBuffer(inAQ, inBuffer));
const int buffers = atomic_fetch_add(&queue->_enqueuedBuffers, -1) - 1;
// if(!buffers) {
// OSSGuard(AudioQueueStop(inAQ, true));
// }
[queue->_queueLock unlock];
id<CSAudioQueueDelegate> delegate = queue.delegate;
[queue->_deallocLock unlock];
if(isRunningDry) [delegate audioQueueIsRunningDry:queue];
if(IsDry(buffers)) [delegate audioQueueIsRunningDry:queue];
}
}
)
@ -108,7 +108,7 @@
- (void)dealloc {
[_deallocLock lock];
if(_audioQueue) {
AudioQueueDispose(_audioQueue, true);
OSSGuard(AudioQueueDispose(_audioQueue, true));
_audioQueue = NULL;
}
@ -125,23 +125,27 @@
size_t bufferBytes = lengthInSamples * sizeof(int16_t);
// Don't enqueue more than 4 buffers ahead of now, to ensure not too much latency accrues.
if(atomic_load_explicit(&_enqueuedBuffers, memory_order_relaxed) > 4) {
if(atomic_load_explicit(&_enqueuedBuffers, memory_order_relaxed) == 4) {
return;
}
const int enqueuedBuffers = atomic_fetch_add(&_enqueuedBuffers, 1);
const int enqueuedBuffers = atomic_fetch_add(&_enqueuedBuffers, 1) + 1;
[_queueLock lock];
AudioQueueBufferRef newBuffer;
AudioQueueAllocateBuffer(_audioQueue, (UInt32)bufferBytes * 2, &newBuffer);
OSSGuard(AudioQueueAllocateBuffer(_audioQueue, (UInt32)bufferBytes * 2, &newBuffer));
memcpy(newBuffer->mAudioData, buffer, bufferBytes);
newBuffer->mAudioDataByteSize = (UInt32)bufferBytes;
AudioQueueEnqueueBuffer(_audioQueue, newBuffer, 0, NULL);
OSSGuard(AudioQueueEnqueueBuffer(_audioQueue, newBuffer, 0, NULL));
// 'Start' the queue. This is documented to be a no-op if the queue is already started,
// and it's better to defer starting it until at least some data is available.
if(enqueuedBuffers > 2) {
AudioQueueStart(_audioQueue, NULL);
OSSGuard(AudioQueueStart(_audioQueue, NULL));
}
[_queueLock unlock];
}
#pragma mark - Sampling Rate getters