Allow larger queues on Teensy 3.5, 3.6, 4.0

https://forum.pjrc.com/threads/58477-extend-Queue-object-for-Teensy-4-0-to-more-blocks

play_queue.cpp

 
 	if (!userblock) return;
 	h = head + 1;
-	if (h >= 32) h = 0;
+	if (h >= max_buffers) h = 0;
 	while (tail == h) ; // wait until space in the queue
 	queue[h] = userblock;
 	head = h;
 
 	t = tail;
 	if (t != head) {
-		if (++t >= 32) t = 0;
+		if (++t >= max_buffers) t = 0;
 		block = queue[t];
 		tail = t;
 		transmit(block);

play_queue.h

 
 class AudioPlayQueue : public AudioStream
 {
+private:
+#if defined(__IMXRT1062__) || defined(__MK66FX1M0__) || defined(__MK64FX512__)
+	static const int max_buffers = 80;
+#else
+	static const int max_buffers = 32;
+#endif
 public:
 	AudioPlayQueue(void) : AudioStream(0, NULL),
 		userblock(NULL), head(0), tail(0) { }
 	//bool isPlaying(void) { return playing; }
 	virtual void update(void);
 private:
-	audio_block_t *queue[32];
+	audio_block_t *queue[max_buffers];
 	audio_block_t *userblock;
 	volatile uint8_t head, tail;
 };

record_queue.cpp

 	h = head;
 	t = tail;
 	if (h >= t) return h - t;
-	return 53 + h - t;
+	return max_buffers + h - t;
 }
 
 void AudioRecordQueue::clear(void)
 	}
 	t = tail;
 	while (t != head) {
-		if (++t >= 53) t = 0;
+		if (++t >= max_buffers) t = 0;
 		release(queue[t]);
 	}
 	tail = t;
 	if (userblock) return NULL;
 	t = tail;
 	if (t == head) return NULL;
-	if (++t >= 53) t = 0;
+	if (++t >= max_buffers) t = 0;
 	userblock = queue[t];
 	tail = t;
 	return userblock->data;
 		return;
 	}
 	h = head + 1;
-	if (h >= 53) h = 0;
+	if (h >= max_buffers) h = 0;
 	if (h == tail) {
 		release(block);
 	} else {

record_queue.h

 
 class AudioRecordQueue : public AudioStream
 {
+private:
+#if defined(__IMXRT1062__) || defined(__MK66FX1M0__) || defined(__MK64FX512__)
+	static const int max_buffers = 209;
+#else
+	static const int max_buffers = 53;
+#endif
 public:
 	AudioRecordQueue(void) : AudioStream(1, inputQueueArray),
 		userblock(NULL), head(0), tail(0), enabled(0) { }
 	virtual void update(void);
 private:
 	audio_block_t *inputQueueArray[1];
-	audio_block_t * volatile queue[53];
+	audio_block_t * volatile queue[max_buffers];
 	audio_block_t *userblock;
 	volatile uint8_t head, tail, enabled;
 };