#include <audioresampler.h>

Collaboration diagram for AudioResampler:

Public Member Functions
	AudioResampler ()

	~AudioResampler ()

void	setDecimation (uint32_t decimation)

uint32_t	getDecimation () const

void	setAudioFilters (int srHigh, int srLow, int fcLow, int fcHigh, float gain=1.0f)

bool	downSample (qint16 sampleIn, qint16 &sampleOut)

bool	upSample (qint16 sampleIn, qint16 &sampleOut)

Private Attributes
AudioFilter	m_audioFilter

uint32_t	m_decimation

uint32_t	m_decimationCount

Detailed Description

Definition at line 25 of file audioresampler.h.

Constructor & Destructor Documentation

◆ AudioResampler()

AudioResampler::AudioResampler ( )

Definition at line 21 of file audioresampler.cpp.

                                :
     m_decimation(1),
     m_decimationCount(0)
 {}

◆ ~AudioResampler()

AudioResampler::~AudioResampler ( )

Definition at line 26 of file audioresampler.cpp.

27 {}

Member Function Documentation

◆ downSample()

bool AudioResampler::downSample	(	qint16	sampleIn,
		qint16 &	sampleOut
	)

Definition at line 47 of file audioresampler.cpp.

References m_audioFilter, m_decimation, m_decimationCount, and AudioFilter::run().

Referenced by getDecimation(), and FreeDVMod::pullAF().

 {
     if (m_decimation == 1)
     {
         sampleOut = sampleIn;
         return true;
     }
 
     if (m_decimationCount >= m_decimation - 1)
     {
         float lpSample = m_audioFilter.run(sampleIn / 32768.0f);
         sampleOut = lpSample * 32768.0f;
         m_decimationCount = 0;
         return true;
     }
     else
     {
         m_decimationCount++;
         return false;
     }
 }

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◆ getDecimation()

uint32_t AudioResampler::getDecimation ( ) const

inline

Definition at line 32 of file audioresampler.h.

References downSample(), m_decimation, setAudioFilters(), and upSample().

Referenced by FreeDVDemod::pushSampleToDV().

32 { return m_decimation; }

AudioResampler::m_decimation

uint32_t m_decimation

Definition: audioresampler.h:39

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◆ setAudioFilters()

void AudioResampler::setAudioFilters	(	int	srHigh,
		int	srLow,
		int	fcLow,
		int	fcHigh,
		float	gain = `1.0f`
	)

Definition at line 34 of file audioresampler.cpp.

References m_audioFilter, and AudioFilter::setDecimFilters().

Referenced by FreeDVMod::applyAudioSampleRate(), FreeDVDemod::applyAudioSampleRate(), and getDecimation().

 {
     srHigh = (srHigh <= 100 ? 100 : srHigh);
     srLow = (srLow <= 0 ? 1 : srLow);
     srLow = srLow > srHigh - 50 ? srHigh - 50 : srLow;
 
     fcLow = fcLow < 0 ? 0 : fcLow;
     fcHigh = fcHigh < 100 ? 100 : fcHigh;
     fcLow = fcLow > fcHigh - 100 ? fcHigh - 100 : fcLow;
 
     m_audioFilter.setDecimFilters(srHigh, srLow, fcHigh, fcLow, gain);
 }

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◆ setDecimation()

void AudioResampler::setDecimation ( uint32_t decimation )

Definition at line 29 of file audioresampler.cpp.

References decimation(), and m_decimation.

Referenced by FreeDVMod::applyAudioSampleRate(), and FreeDVDemod::applyAudioSampleRate().

 {
     m_decimation = decimation == 0 ? 1 : decimation;
 }

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◆ upSample()

bool AudioResampler::upSample	(	qint16	sampleIn,
		qint16 &	sampleOut
	)

Definition at line 69 of file audioresampler.cpp.

References m_audioFilter, m_decimation, m_decimationCount, and AudioFilter::run().

Referenced by getDecimation(), and FreeDVDemod::pushSampleToDV().

 {
     float lpSample;
 
     if (m_decimation == 1)
     {
         sampleOut = sampleIn;
         return true;
     }
 
     if (m_decimationCount >= m_decimation - 1)
     {
         m_decimationCount = 0;
         lpSample = m_audioFilter.run(sampleIn / 32768.0f);
         sampleOut = lpSample * 32768.0f;
         return true;
     }
     else
     {
         m_decimationCount++;
         lpSample = m_audioFilter.run(0.0f);
         sampleOut = lpSample * 32768.0f;
         return false;
     }
 }