AudioFifo Class Reference

#include <audiofifo.h>

Inherits QObject.

Public Member Functions
	AudioFifo ()
	AudioFifo (uint32_t numSamples)
	~AudioFifo ()
bool	setSize (uint32_t numSamples)
uint32_t	write (const quint8 *data, uint32_t numSamples)
uint32_t	read (quint8 *data, uint32_t numSamples)
uint32_t	drain (uint32_t numSamples)
void	clear ()
uint32_t	flush ()
uint32_t	fill () const
bool	isEmpty () const
bool	isFull () const
uint32_t	size () const

Private Member Functions
bool	create (uint32_t numSamples)

Private Attributes
QMutex	m_mutex
qint8 *	m_fifo
const uint32_t	m_sampleSize
uint32_t	m_size
uint32_t	m_fill
uint32_t	m_head
uint32_t	m_tail

Detailed Description

Definition at line 29 of file audiofifo.h.

Constructor & Destructor Documentation

AudioFifo() [1/2]

AudioFifo::AudioFifo

(

)

Definition at line 27 of file audiofifo.cpp.

References m_fill, m_head, m_size, and m_tail.

                     :
    m_fifo(0),
    m_sampleSize(sizeof(AudioSample))
{
    m_size = 0;
    m_fill = 0;
    m_head = 0;
    m_tail = 0;
}

AudioFifo() [2/2]

AudioFifo::AudioFifo

(

uint32_t

numSamples

)

Definition at line 37 of file audiofifo.cpp.

References create(), and m_mutex.

                                        :
    m_fifo(0),
    m_sampleSize(sizeof(AudioSample))
{
    QMutexLocker mutexLocker(&m_mutex);

    create(numSamples);
}

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~AudioFifo()

AudioFifo::~AudioFifo

(

)

Definition at line 46 of file audiofifo.cpp.

References m_fifo, m_mutex, and m_size.

{
    QMutexLocker mutexLocker(&m_mutex);

    if (m_fifo != 0)
    {
        delete[] m_fifo;
        m_fifo = 0;
    }

    m_size = 0;
}

Member Function Documentation

clear()

void AudioFifo::clear

(

)

Definition at line 156 of file audiofifo.cpp.

References m_fill, m_head, m_mutex, and m_tail.

Referenced by AMDemod::processOneSample(), AMMod::processOneSample(), NFMMod::processOneSample(), SSBMod::processOneSample(), AMDemod::start(), WFMDemod::start(), DSDDemod::start(), NFMDemod::start(), BFMDemod::start(), DATVDemod::start(), AMMod::start(), WFMMod::start(), NFMMod::start(), SSBMod::start(), and FreeDVMod::start().

{
    QMutexLocker mutexLocker(&m_mutex);

    m_fill = 0;
    m_head = 0;
    m_tail = 0;
}

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create()

bool AudioFifo::create ( uint32_t  numSamples )

private

Definition at line 165 of file audiofifo.cpp.

References m_fifo, m_fill, m_head, m_sampleSize, m_size, and m_tail.

Referenced by AudioFifo(), and setSize().

{
    if(m_fifo != 0)
    {
        delete[] m_fifo;
        m_fifo = 0;
    }

    m_fill = 0;
    m_head = 0;
    m_tail = 0;

    m_fifo = new qint8[numSamples * m_sampleSize];
    m_size = numSamples;

    return true;
}

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drain()

uint AudioFifo::drain

(

uint32_t

numSamples

)

Definition at line 141 of file audiofifo.cpp.

References m_fill, m_head, m_mutex, and m_size.

{
    QMutexLocker mutexLocker(&m_mutex);

    if(numSamples > m_fill)
    {
        numSamples = m_fill;
    }

    m_head = (m_head + numSamples) % m_size;
    m_fill -= numSamples;

    return numSamples;
}

fill()

uint32_t AudioFifo::fill ( ) const

inline

Definition at line 45 of file audiofifo.h.

{ return m_fill; }

flush()

uint32_t AudioFifo::flush ( )

inline

Definition at line 44 of file audiofifo.h.

{ return drain(m_fill); }

isEmpty()

bool AudioFifo::isEmpty ( ) const

inline

Definition at line 46 of file audiofifo.h.

Referenced by read().

{ return m_fill == 0; }

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isFull()

bool AudioFifo::isFull ( ) const

inline

Definition at line 47 of file audiofifo.h.

Referenced by write().

{ return m_fill == m_size; }

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read()

uint AudioFifo::read	(	quint8 *	data,
		uint32_t	numSamples
	)

Definition at line 103 of file audiofifo.cpp.

References isEmpty(), m_fifo, m_fill, m_head, m_mutex, m_sampleSize, m_size, and MIN.

Referenced by AMMod::pullAudio(), WFMMod::pullAudio(), NFMMod::pullAudio(), SSBMod::pullAudio(), FreeDVMod::pullAudio(), FCDProThread::work(), and FCDProPlusThread::work().

{
    uint32_t total;
    uint32_t remaining;
    uint32_t copyLen;

    if (m_fifo == 0) {
        return 0;
    }

    m_mutex.lock();

    total = MIN(numSamples, m_fill);
    remaining = total;

    while (remaining != 0)
    {
        if (isEmpty())
        {
            m_mutex.unlock();
            return total - remaining; // read so far
        }

        copyLen = MIN(remaining, m_fill);
        copyLen = MIN(copyLen, m_size - m_head);
        memcpy(data, m_fifo + (m_head * m_sampleSize), copyLen * m_sampleSize);

        m_head += copyLen;
        m_head %= m_size;
        m_fill -= copyLen;
        data += copyLen * m_sampleSize;
        remaining -= copyLen;
    }

    m_mutex.unlock();
    return total;
}

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setSize()

bool AudioFifo::setSize

(

uint32_t

numSamples

)

Definition at line 59 of file audiofifo.cpp.

References create(), and m_mutex.

Referenced by AMDemod::applyAudioSampleRate(), SSBDemod::applyAudioSampleRate(), and FreeDVDemod::applyAudioSampleRate().

{
    QMutexLocker mutexLocker(&m_mutex);

    return create(numSamples);
}

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size()

uint32_t AudioFifo::size ( ) const

inline

Definition at line 48 of file audiofifo.h.

{ return m_size; }

write()

uint AudioFifo::write	(	const quint8 *	data,
		uint32_t	numSamples
	)

Definition at line 66 of file audiofifo.cpp.

References isFull(), m_fifo, m_fill, m_mutex, m_sampleSize, m_size, m_tail, and MIN.

Referenced by UDPSink::audioReadyRead(), AMDemod::feed(), WFMDemod::feed(), DSDDemod::feed(), BFMDemod::feed(), FreeDVDemod::feed(), AMBEWorker::handleInputMessages(), AMDemod::processOneSample(), NFMDemod::processOneSample(), AMMod::processOneSample(), NFMMod::processOneSample(), SSBDemod::processOneSample(), SSBMod::processOneSample(), FreeDVDemod::pushSampleToAudio(), and DATVideoRender::RenderStream().

{
    uint32_t total;
    uint32_t remaining;
    uint32_t copyLen;

    if (m_fifo == 0) {
        return 0;
    }

    m_mutex.lock();

    total = MIN(numSamples, m_size - m_fill);
    remaining = total;

    while (remaining != 0)
    {
        if (isFull())
        {
            m_mutex.unlock();
            return total - remaining; // written so far
        }

        copyLen = MIN(remaining, m_size - m_fill);
        copyLen = MIN(copyLen, m_size - m_tail);
        memcpy(m_fifo + (m_tail * m_sampleSize), data, copyLen * m_sampleSize);
        m_tail += copyLen;
        m_tail %= m_size;
        m_fill += copyLen;
        data += copyLen * m_sampleSize;
        remaining -= copyLen;
    }

    m_mutex.unlock();
    return total;
}

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Member Data Documentation

m_fifo

qint8* AudioFifo::m_fifo

private

Definition at line 53 of file audiofifo.h.

Referenced by create(), read(), write(), and ~AudioFifo().

m_fill

uint32_t AudioFifo::m_fill

private

Definition at line 58 of file audiofifo.h.

Referenced by AudioFifo(), clear(), create(), drain(), read(), and write().

m_head

uint32_t AudioFifo::m_head

private

Definition at line 59 of file audiofifo.h.

Referenced by AudioFifo(), clear(), create(), drain(), and read().

m_mutex

QMutex AudioFifo::m_mutex

private

Definition at line 51 of file audiofifo.h.

Referenced by AudioFifo(), clear(), drain(), read(), setSize(), write(), and ~AudioFifo().

m_sampleSize

const uint32_t AudioFifo::m_sampleSize

private

Definition at line 55 of file audiofifo.h.

Referenced by create(), read(), and write().

m_size

uint32_t AudioFifo::m_size

private

Definition at line 57 of file audiofifo.h.

Referenced by AudioFifo(), create(), drain(), read(), write(), and ~AudioFifo().

m_tail

uint32_t AudioFifo::m_tail

private

Definition at line 60 of file audiofifo.h.

Referenced by AudioFifo(), clear(), create(), and write().

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

• sdrbase/audio/audiofifo.h
• sdrbase/audio/audiofifo.cpp