QAudioRingBuffer Class Reference

#include <qaudio_mac_p.h>

Public Types
typedef QPair< char *, int >	Region

Public Functions
Region	acquireReadRegion (int size)
Region	acquireWriteRegion (int size)
int	free () const
	QAudioRingBuffer (int bufferSize)
void	releaseReadRegion (Region const &region)
void	releaseWriteRegion (Region const &region)
void	reset ()
int	size () const
int	used () const
	~QAudioRingBuffer ()

Properties
char *	m_buffer
int	m_bufferSize
QAtomicInt	m_bufferUsed
int	m_readPos
int	m_writePos

Detailed Description

Definition at line 76 of file qaudio_mac_p.h.

Typedefs

Region

typedef QPair<char*, int> QAudioRingBuffer::Region

Definition at line 79 of file qaudio_mac_p.h.

Constructors and Destructors

QAudioRingBuffer()

QAudioRingBuffer::QAudioRingBuffer

(

int

bufferSize

)

Definition at line 109 of file qaudio_mac.cpp.

                                                :
    m_bufferSize(bufferSize)
{
    m_buffer = new char[m_bufferSize];
    reset();
}

~QAudioRingBuffer()

QAudioRingBuffer::~QAudioRingBuffer

(

)

Definition at line 116 of file qaudio_mac.cpp.

{
    delete m_buffer;
}

Functions

acquireReadRegion()

Region QAudioRingBuffer::acquireReadRegion ( int  size )

inline

Definition at line 84 of file qaudio_mac_p.h.

Referenced by QtMultimediaInternal::QAudioOutputBuffer::readFrames().

    {
        const int used = m_bufferUsed.fetchAndAddAcquire(0);

        if (used > 0) {
            const int readSize = qMin(size, qMin(m_bufferSize - m_readPos, used));

            return readSize > 0 ? Region(m_buffer + m_readPos, readSize) : Region(0, 0);
        }

        return Region(0, 0);
    }

acquireWriteRegion()

Region QAudioRingBuffer::acquireWriteRegion ( int  size )

inline

Definition at line 104 of file qaudio_mac_p.h.

Referenced by QtMultimediaInternal::QAudioOutputBuffer::fillBuffer(), and QtMultimediaInternal::QAudioOutputBuffer::writeBytes().

    {
        const int free = m_bufferSize - m_bufferUsed.fetchAndAddAcquire(0);

        if (free > 0) {
            const int writeSize = qMin(size, qMin(m_bufferSize - m_writePos, free));

            return writeSize > 0 ? Region(m_buffer + m_writePos, writeSize) : Region(0, 0);
        }

        return Region(0, 0);
    }

free()

int QAudioRingBuffer::free

(

)

const

Definition at line 126 of file qaudio_mac.cpp.

Referenced by acquireWriteRegion(), QtMultimediaInternal::QAudioOutputBuffer::available(), QtMultimediaInternal::QAudioOutputBuffer::fillBuffer(), and releaseWriteRegion().

{
    return m_bufferSize - m_bufferUsed;
}

releaseReadRegion()

void QAudioRingBuffer::releaseReadRegion ( Region const &  region )

inline

Definition at line 97 of file qaudio_mac_p.h.

Referenced by QtMultimediaInternal::QAudioOutputBuffer::readFrames().

    {
        m_readPos = (m_readPos + region.second) % m_bufferSize;

        m_bufferUsed.fetchAndAddRelease(-region.second);
    }

releaseWriteRegion()

void QAudioRingBuffer::releaseWriteRegion ( Region const &  region )

inline

Definition at line 117 of file qaudio_mac_p.h.

Referenced by QtMultimediaInternal::QAudioOutputBuffer::fillBuffer(), and QtMultimediaInternal::QAudioOutputBuffer::writeBytes().

    {
        m_writePos = (m_writePos + region.second) % m_bufferSize;

        m_bufferUsed.fetchAndAddRelease(region.second);
    }

reset()

void QAudioRingBuffer::reset

(

)

Definition at line 136 of file qaudio_mac.cpp.

Referenced by QAudioRingBuffer(), releaseWriteRegion(), and QtMultimediaInternal::QAudioOutputBuffer::reset().

{
    m_readPos = 0;
    m_writePos = 0;
    m_bufferUsed = 0;
}

size()

int QAudioRingBuffer::size

(

)

const

Definition at line 131 of file qaudio_mac.cpp.

Referenced by releaseWriteRegion(), and QtMultimediaInternal::QAudioOutputBuffer::startFillTimer().

{
    return m_bufferSize;
}

used()

int QAudioRingBuffer::used

(

)

const

Definition at line 121 of file qaudio_mac.cpp.

Referenced by acquireReadRegion(), and releaseWriteRegion().

{
    return m_bufferUsed;
}

Properties

m_buffer

char* QAudioRingBuffer::m_buffer

private

Definition at line 134 of file qaudio_mac_p.h.

Referenced by acquireReadRegion(), acquireWriteRegion(), QAudioRingBuffer(), and ~QAudioRingBuffer().

m_bufferSize

int QAudioRingBuffer::m_bufferSize

private

Definition at line 131 of file qaudio_mac_p.h.

Referenced by acquireReadRegion(), acquireWriteRegion(), free(), QAudioRingBuffer(), releaseReadRegion(), releaseWriteRegion(), and size().

m_bufferUsed

QAtomicInt QAudioRingBuffer::m_bufferUsed

private

Definition at line 135 of file qaudio_mac_p.h.

Referenced by acquireReadRegion(), acquireWriteRegion(), free(), releaseReadRegion(), releaseWriteRegion(), reset(), and used().

m_readPos

int QAudioRingBuffer::m_readPos

private

Definition at line 132 of file qaudio_mac_p.h.

Referenced by acquireReadRegion(), releaseReadRegion(), and reset().

m_writePos

int QAudioRingBuffer::m_writePos

private

Definition at line 133 of file qaudio_mac_p.h.

Referenced by acquireWriteRegion(), releaseWriteRegion(), and reset().

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

• /src/multimedia/audio/qaudio_mac_p.h
• /src/multimedia/audio/qaudio_mac.cpp