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FreeDV demod: implemented interpolator/decimator

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This commit is contained in:
f4exb 2019-06-09 19:04:32 +02:00
parent fb0ec4a680
commit 8d493a9d2d
2 changed files with 69 additions and 52 deletions
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62
plugins/channelrx/demodfreedv/freedvdemod.cpp
View File

@ -266,15 +266,51 @@ void FreeDVDemod::feed(const SampleVector::const_iterator& begin, const SampleVe
Complex c(it->real(), it->imag());
c *= m_nco.nextIQ();
if(m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
if (m_interpolatorDistance < 1.0f) // interpolate
{
n_out = SSBFilter->runSSB(ci, &sideband, true);
while (!m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci))
{
processOneSample(ci);
m_interpolatorDistanceRemain += m_interpolatorDistance;
}
}
else
{
n_out = 0;
if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
{
processOneSample(ci);
m_interpolatorDistanceRemain += m_interpolatorDistance;
}
}
}
uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill);
if (res != m_audioBufferFill)
{
qDebug("FreeDVDemod::feed: %u/%u tail samples written", res, m_audioBufferFill);
}
m_audioBufferFill = 0;
if (m_sampleSink != 0)
{
m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), true);
}
m_sampleBuffer.clear();
m_settingsMutex.unlock();
}
void FreeDVDemod::processOneSample(Complex &ci)
{
fftfilt::cmplx *sideband;
int n_out = 0;
int decim = 1<<(m_spanLog2 - 1);
unsigned char decim_mask = decim - 1; // counter LSB bit mask for decimation by 2^(m_scaleLog2 - 1)
n_out = SSBFilter->runSSB(ci, &sideband, true); // always USB side
for (int i = 0; i < n_out; i++)
{
@ -319,30 +355,10 @@ void FreeDVDemod::feed(const SampleVector::const_iterator& begin, const SampleVe
demod *= m_settings.m_volumeIn;
}
pushSampleToDV((qint16) demod);
}
}
uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill);
if (res != m_audioBufferFill)
{
qDebug("FreeDVDemod::feed: %u/%u tail samples written", res, m_audioBufferFill);
}
m_audioBufferFill = 0;
if (m_sampleSink != 0)
{
m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), true);
}
m_sampleBuffer.clear();
m_settingsMutex.unlock();
}
void FreeDVDemod::start()
{
applyChannelSettings(m_inputSampleRate, m_inputFrequencyOffset, true);

1
plugins/channelrx/demodfreedv/freedvdemod.h
View File

@ -417,6 +417,7 @@ private:
void applySettings(const FreeDVDemodSettings& settings, bool force = false);
void applyAudioSampleRate(int sampleRate);
void applyFreeDVMode(FreeDVDemodSettings::FreeDVMode mode);
void processOneSample(Complex &ci);
void webapiFormatChannelSettings(SWGSDRangel::SWGChannelSettings& response, const FreeDVDemodSettings& settings);
void webapiFormatChannelReport(SWGSDRangel::SWGChannelReport& response);
void webapiReverseSendSettings(QList<QString>& channelSettingsKeys, const FreeDVDemodSettings& settings, bool force);