Kwave::Delay Class Reference

#include <Delay.h>

Inheritance diagram for Kwave::Delay:

Collaboration diagram for Kwave::Delay:

Public Slots
void	input (Kwave::SampleArray data)
void	setDelay (const QVariant &d)

Signals
void	output (Kwave::SampleArray data)
Signals inherited from Kwave::StreamObject
void	attributeChanged (const QVariant value)

Public Member Functions
	Delay ()
virtual	~Delay () Q_DECL_OVERRIDE
virtual void	goOn () Q_DECL_OVERRIDE
Public Member Functions inherited from Kwave::SampleSource
	SampleSource (QObject *parent=Q_NULLPTR)
virtual	~SampleSource ()
virtual bool	done () const
Public Member Functions inherited from Kwave::StreamObject
	StreamObject (QObject *parent=Q_NULLPTR)
virtual	~StreamObject ()
virtual unsigned int	tracks () const
virtual Kwave::StreamObject *	operator[] (unsigned int track)
virtual unsigned int	tracksOfPort (const char *port) const
virtual Kwave::StreamObject *	port (const char *port, unsigned int track)
virtual unsigned int	blockSize () const
void	setAttribute (const char *attribute, const QVariant &value)

Private Attributes
Kwave::SampleFIFO	m_fifo
Kwave::SampleArray	m_out_buffer
unsigned int	m_delay

Additional Inherited Members
Static Public Member Functions inherited from Kwave::StreamObject
static void	setInteractive (bool interactive)

Detailed Description

Definition at line 34 of file Delay.h.

Constructor & Destructor Documentation

Delay()

Kwave::Delay::Delay

(

)

Constructor

Definition at line 24 of file Delay.cpp.

    :Kwave::SampleSource(), m_fifo(), m_out_buffer(blockSize()), m_delay(0)
{
}

~Delay()

Kwave::Delay::~Delay ( )

virtual

Destructor

Definition at line 30 of file Delay.cpp.

{
}

Member Function Documentation

goOn()

void Kwave::Delay::goOn ( )

virtual

does the calculation

Implements Kwave::SampleSource.

Definition at line 35 of file Delay.cpp.

References Kwave::SampleFIFO::get(), m_fifo, m_out_buffer, and output().

{
    m_fifo.get(m_out_buffer);
    emit output(m_out_buffer);
}

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input

void Kwave::Delay::input ( Kwave::SampleArray  data )

slot

receives input data

Definition at line 42 of file Delay.cpp.

References m_fifo, and Kwave::SampleFIFO::put().

{
    m_fifo.put(data);
}

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output

void Kwave::Delay::output ( Kwave::SampleArray  data )

signal

emits a block with delayed wave data

Referenced by goOn().

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setDelay

void Kwave::Delay::setDelay ( const QVariant &  d )

slot

Sets the delay time, normed to samples. The default setting is zero.

Definition at line 48 of file Delay.cpp.

References Kwave::StreamObject::blockSize(), Kwave::SampleFIFO::flush(), m_delay, m_fifo, Kwave::SampleFIFO::put(), Kwave::SampleArray::resize(), and Kwave::SampleArray::size().

{
    unsigned int new_delay = QVariant(d).toUInt();
    if (new_delay == m_delay) return; // nothing to do

    // fill it with zeroes, up to the delay time
    m_fifo.flush();
    Kwave::SampleArray zeroes(blockSize());
    Q_ASSERT(zeroes.size() == blockSize());
    for (unsigned int pos=0; pos < blockSize(); ++pos)
        zeroes[pos] = 0;
    unsigned int rest = new_delay;
    while (rest) {
        bool ok = true;
        unsigned int len = blockSize();
        if (rest < len) {
            ok = zeroes.resize(rest);
            Q_ASSERT(ok);
        }
        if (ok) m_fifo.put(zeroes);
        rest -= zeroes.size();
    }
}

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Member Data Documentation

m_delay

unsigned int Kwave::Delay::m_delay

private

delay [samples]

Definition at line 71 of file Delay.h.

Referenced by setDelay().

m_fifo

Kwave::SampleFIFO Kwave::Delay::m_fifo

private

buffer for delaying data

Definition at line 65 of file Delay.h.

Referenced by goOn(), input(), and setDelay().

m_out_buffer

Kwave::SampleArray Kwave::Delay::m_out_buffer

private

buffer for output data

Definition at line 68 of file Delay.h.

Referenced by goOn().

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

• libkwave/modules/Delay.h
• libkwave/modules/Delay.cpp