hula::HulaRingBuffer Class Reference

HulaLoop wrapper class for PortAudio ring buffer. More...

#include <HulaRingBuffer.h>

Public Member Functions
	HulaRingBuffer (float maxDuration)
	Create a new ring buffer. More...
ring_buffer_size_t	read (SAMPLE *data, ring_buffer_size_t maxSamples)
	Read up to maxSamples from the ring buffer into the memory pointed to by data. More...
ring_buffer_size_t	directRead (ring_buffer_size_t maxSamples, void **dataPtr1, ring_buffer_size_t *size1, void **dataPtr2, ring_buffer_size_t *size2)
	Fetch direct pointers to memory within the ring buffer. More...
ring_buffer_size_t	write (const SAMPLE *data, ring_buffer_size_t maxSamples)
	Add data to the ring buffer. More...
	~HulaRingBuffer ()
	Destructor for the ring buffer. More...

Detailed Description

HulaLoop wrapper class for PortAudio ring buffer.

Constructor & Destructor Documentation

HulaRingBuffer::HulaRingBuffer

(

float

maxDuration

)

Create a new ring buffer.

The ring buffer's size is determined using the formula:

maxDuration * sampleRate * channelCount * sampleSize 

Parameters

maxDuration

The maximum length in seconds that the ring buffer should be capable of holding.

Member Function Documentation

ring_buffer_size_t HulaRingBuffer::directRead	(	ring_buffer_size_t	maxSamples,
		void **	dataPtr1,
		ring_buffer_size_t *	size1,
		void **	dataPtr2,
		ring_buffer_size_t *	size2
	)

Fetch direct pointers to memory within the ring buffer.

This can be used to avoid allocating a secondary container. The second pointer/size pair is for when the ring buffer has split data between its tail and head. If the requested maxBytes are continuous in the underlying memory, only the first pointer/size pair is used.

Parameters

maxSamples	Desired number of samples.
dataPtr1	The address where the first pointer should be stored.
size1	Number of elements available from dataPtr1.
dataPtr2	The address where the second pointer (if required) will be stored. NULL if not used.
size2	Number of elements available from dataPtr2.

Returns

Number of samples read.

ring_buffer_size_t HulaRingBuffer::read	(	SAMPLE *	data,
		ring_buffer_size_t	maxSamples
	)

Read up to maxSamples from the ring buffer into the memory pointed to by data.

Parameters

data	Pointer to allocated memory of at least maxSamples size.
maxSamples	Desired number of samples.

Returns

Number of samples read.

ring_buffer_size_t HulaRingBuffer::write	(	const SAMPLE *	data,
		ring_buffer_size_t	maxSamples
	)

Add data to the ring buffer.

Parameters

data	Array of samples to write to the ring buffer.
maxSamples	Number of samples contained in the array.

Returns

Number of samples written.

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The documentation for this class was generated from the following files:

• HulaRingBuffer.h
• HulaRingBuffer.cpp