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492 lines
16 KiB
C++
492 lines
16 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019-2022 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// Copyright (C) 2022 Jiří Pinkava <jiri.pinkava@rossum.ai> //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QDebug>
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#include "dsp/datafifo.h"
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#include "dsp/misc.h"
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#include "dsp/cwkeyer.h"
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#include "util/messagequeue.h"
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#include "maincore.h"
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#include "nfmmodsource.h"
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const int NFMModSource::m_levelNbSamples = 480; // every 10ms
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const float NFMModSource::m_preemphasis = 120.0e-6f; // 120us
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NFMModSource::NFMModSource() :
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m_preemphasisFilter(m_preemphasis*48000),
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m_audioFifo(12000),
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m_feedbackAudioFifo(48000)
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{
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m_audioFifo.setLabel("NFMModSource.m_audioFifo");
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m_feedbackAudioFifo.setLabel("NFMModSource.m_feedbackAudioFifo");
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m_audioBuffer.resize(24000);
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m_audioBufferFill = 0;
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m_audioReadBuffer.resize(24000);
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m_audioReadBufferFill = 0;
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m_feedbackAudioBuffer.resize(1<<14);
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m_feedbackAudioBufferFill = 0;
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m_demodBuffer.resize(1<<12);
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m_demodBufferFill = 0;
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m_magsq = 0.0;
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m_audioCompressor.initSimple(
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m_audioSampleRate,
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-8, // pregain (dB)
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-20, // threshold (dB)
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20, // knee (dB)
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15, // ratio (dB)
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0.003f,// attack (s)
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0.25 // release (s)
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);
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applySettings(m_settings, true);
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
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}
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NFMModSource::~NFMModSource() = default;
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void NFMModSource::pull(SampleVector::iterator begin, unsigned int nbSamples)
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{
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std::for_each(
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begin,
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begin + nbSamples,
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[this](Sample& s) {
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pullOne(s);
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}
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);
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}
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void NFMModSource::pullOne(Sample& sample)
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{
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if (m_settings.m_channelMute)
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{
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sample.m_real = 0.0f;
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sample.m_imag = 0.0f;
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return;
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}
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Complex ci;
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if (m_interpolatorDistance > 1.0f) // decimate
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{
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modulateSample();
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while (!m_interpolator.decimate(&m_interpolatorDistanceRemain, m_modSample, &ci))
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{
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modulateSample();
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}
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}
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else
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{
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if (m_interpolator.interpolate(&m_interpolatorDistanceRemain, m_modSample, &ci))
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{
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modulateSample();
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}
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}
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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ci *= m_carrierNco.nextIQ(); // shift to carrier frequency
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double magsq = ci.real() * ci.real() + ci.imag() * ci.imag();
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magsq /= (SDR_TX_SCALED*SDR_TX_SCALED);
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m_movingAverage(magsq);
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m_magsq = m_movingAverage.asDouble();
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sample.m_real = (FixReal) ci.real();
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sample.m_imag = (FixReal) ci.imag();
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}
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void NFMModSource::prefetch(unsigned int nbSamples)
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{
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unsigned int nbSamplesAudio = (nbSamples * (unsigned int) ((Real) m_audioSampleRate / (Real) m_channelSampleRate));
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pullAudio(nbSamplesAudio);
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}
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void NFMModSource::pullAudio(unsigned int nbSamplesAudio)
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{
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QMutexLocker mlock(&m_mutex);
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if (nbSamplesAudio > m_audioBuffer.size()) {
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m_audioBuffer.resize(nbSamplesAudio);
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}
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std::copy(&m_audioReadBuffer[0], &m_audioReadBuffer[nbSamplesAudio], &m_audioBuffer[0]);
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m_audioBufferFill = 0;
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if (m_audioReadBufferFill > nbSamplesAudio) // copy back remaining samples at the start of the read buffer
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{
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std::copy(&m_audioReadBuffer[nbSamplesAudio], &m_audioReadBuffer[m_audioReadBufferFill], &m_audioReadBuffer[0]);
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m_audioReadBufferFill = m_audioReadBufferFill - nbSamplesAudio; // adjust current read buffer fill pointer
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}
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}
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void NFMModSource::modulateSample()
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{
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Real t0 = 0.0f;
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Real t1 = 0.0f;
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Real t = 0.0f;
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pullAF(t0);
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if (m_settings.m_preEmphasisOn) {
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m_preemphasisFilter.process(t0, t);
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} else {
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t = t0;
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}
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if (m_settings.m_feedbackAudioEnable) {
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pushFeedback(t * m_settings.m_feedbackVolumeFactor * 16384.0f);
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}
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calculateLevel(t);
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if (m_settings.m_ctcssOn) {
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t1 = 0.85f * m_bandpass.filter(t) + 0.15f * 0.625f * m_ctcssNco.next();
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} else if (m_settings.m_dcsOn) {
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t1 = 0.9f * m_bandpass.filter(t) + 0.1f * 0.625f * (float) m_dcsMod.next();
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} else if (m_settings.m_bpfOn) {
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t1 = m_bandpass.filter(t);
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} else {
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t1 = m_lowpass.filter(t);
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}
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m_modPhasor += (float) ((M_PI * m_settings.m_fmDeviation / (float) m_audioSampleRate) * t1);
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// limit phasor range to ]-pi,pi]
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if (m_modPhasor > M_PI) {
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m_modPhasor -= (float) (2.0 * M_PI);
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}
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m_modSample.real((float) (cos(m_modPhasor) * 0.891235351562f * SDR_TX_SCALEF)); // -1 dB
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m_modSample.imag((float) (sin(m_modPhasor) * 0.891235351562f * SDR_TX_SCALEF));
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m_demodBuffer[m_demodBufferFill] = (qint16) (t1 * std::numeric_limits<int16_t>::max());
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++m_demodBufferFill;
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if (m_demodBufferFill >= m_demodBuffer.size())
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{
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QList<ObjectPipe*> dataPipes;
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MainCore::instance()->getDataPipes().getDataPipes(m_channel, "demod", dataPipes);
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if (!dataPipes.empty())
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{
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for (auto& dataPipe : dataPipes)
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{
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DataFifo *fifo = qobject_cast<DataFifo*>(dataPipe->m_element);
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if (fifo) {
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fifo->write((quint8*) &m_demodBuffer[0], m_demodBuffer.size() * sizeof(qint16), DataFifo::DataTypeI16);
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}
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}
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}
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m_demodBufferFill = 0;
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}
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}
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void NFMModSource::pullAF(Real& sample)
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{
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switch (m_settings.m_modAFInput)
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{
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case NFMModSettings::NFMModInputTone:
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sample = m_toneNco.next();
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break;
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case NFMModSettings::NFMModInputFile:
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if (m_ifstream && m_ifstream->is_open())
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{
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if (m_ifstream->eof() && m_settings.m_playLoop)
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{
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m_ifstream->clear();
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m_ifstream->seekg(0, std::ios::beg);
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}
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if (m_ifstream->eof())
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{
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sample = 0.0f;
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}
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else
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{
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m_ifstream->read(reinterpret_cast<char*>(&sample), sizeof(Real));
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sample *= m_settings.m_volumeFactor;
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}
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}
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else
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{
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sample = 0.0f;
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}
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break;
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case NFMModSettings::NFMModInputAudio:
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if (m_audioBufferFill < m_audioBuffer.size())
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{
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if (m_settings.m_compressorEnable)
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{
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sample = ((m_audioBuffer[m_audioBufferFill].l + m_audioBuffer[m_audioBufferFill].r) / 3276.8f);
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sample = clamp<float>(m_audioCompressor.compress(sample), -1.0f, 1.0f) * m_settings.m_volumeFactor * 3.0f;
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}
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else
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{
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sample = ((m_audioBuffer[m_audioBufferFill].l + m_audioBuffer[m_audioBufferFill].r) / 3276.8f) * m_settings.m_volumeFactor;
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}
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m_audioBufferFill++;
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}
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else
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{
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std::size_t size = m_audioBuffer.size();
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qDebug("NFMModSource::pullAF: starve audio samples: size: %lu", size);
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sample = ((m_audioBuffer[size-1].l + m_audioBuffer[size-1].r) / 65536.0f) * m_settings.m_volumeFactor;
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}
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break;
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case NFMModSettings::NFMModInputCWTone:
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Real fadeFactor;
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if (!m_cwKeyer) {
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break;
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}
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if (m_cwKeyer->getSample())
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{
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m_cwKeyer->getCWSmoother().getFadeSample(true, fadeFactor);
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sample = m_toneNco.next() * fadeFactor;
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}
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else
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{
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if (m_cwKeyer->getCWSmoother().getFadeSample(false, fadeFactor))
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{
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sample = m_toneNco.next() * fadeFactor;
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}
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else
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{
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sample = 0.0f;
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m_toneNco.setPhase(0);
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}
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}
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break;
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default:
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sample = 0.0f;
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break;
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}
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}
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void NFMModSource::pushFeedback(Real sample)
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{
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Complex c(sample, sample);
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Complex ci;
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if (m_feedbackInterpolatorDistance < 1.0f) // interpolate
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{
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while (!m_feedbackInterpolator.interpolate(&m_feedbackInterpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_feedbackInterpolatorDistanceRemain += m_feedbackInterpolatorDistance;
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}
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}
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else // decimate
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{
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if (m_feedbackInterpolator.decimate(&m_feedbackInterpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_feedbackInterpolatorDistanceRemain += m_feedbackInterpolatorDistance;
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}
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}
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}
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void NFMModSource::processOneSample(const Complex& ci)
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{
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m_feedbackAudioBuffer[m_feedbackAudioBufferFill].l = (qint16) ci.real();
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m_feedbackAudioBuffer[m_feedbackAudioBufferFill].r = (qint16) ci.imag();
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++m_feedbackAudioBufferFill;
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if (m_feedbackAudioBufferFill >= m_feedbackAudioBuffer.size())
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{
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uint res = m_feedbackAudioFifo.write((const quint8*)&m_feedbackAudioBuffer[0], m_feedbackAudioBufferFill);
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if (res != m_feedbackAudioBufferFill)
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{
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qDebug("NFMModSource::pushFeedback: %u/%u audio samples written m_feedbackInterpolatorDistance: %f",
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res, m_feedbackAudioBufferFill, m_feedbackInterpolatorDistance);
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m_feedbackAudioFifo.clear();
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}
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m_feedbackAudioBufferFill = 0;
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}
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}
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void NFMModSource::calculateLevel(const Real& sample)
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{
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if (m_levelCalcCount < m_levelNbSamples)
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{
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m_peakLevel = std::max(std::fabs(m_peakLevel), sample);
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m_levelSum += sample * sample;
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m_levelCalcCount++;
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}
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else
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{
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m_rmsLevel = sqrt(m_levelSum / m_levelNbSamples);
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m_peakLevelOut = m_peakLevel;
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m_peakLevel = 0.0f;
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m_levelSum = 0.0f;
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m_levelCalcCount = 0;
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}
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}
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void NFMModSource::applyAudioSampleRate(int sampleRate)
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{
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if (sampleRate < 0)
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{
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qWarning("NFMModSource::applyAudioSampleRate: invalid sample rate %d", sampleRate);
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return;
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}
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qDebug("NFMModSource::applyAudioSampleRate: %d", sampleRate);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorConsumed = false;
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m_interpolatorDistance = (Real) sampleRate / (Real) m_channelSampleRate;
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m_interpolator.create(48, sampleRate, m_settings.m_rfBandwidth / 2.2, 3.0);
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m_lowpass.create(301, sampleRate, m_settings.m_afBandwidth);
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m_bandpass.create(301, sampleRate, 300.0, m_settings.m_afBandwidth);
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m_toneNco.setFreq(m_settings.m_toneFrequency, (float) sampleRate);
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m_ctcssNco.setFreq(NFMModSettings::getCTCSSFreq(m_settings.m_ctcssIndex), (float) sampleRate);
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m_dcsMod.setSampleRate(sampleRate);
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if (m_cwKeyer)
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{
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m_cwKeyer->setSampleRate(sampleRate);
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m_cwKeyer->reset();
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}
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m_preemphasisFilter.configure(m_preemphasis * (float) sampleRate);
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m_audioCompressor.m_rate = (float) sampleRate;
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m_audioCompressor.initState();
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m_audioSampleRate = sampleRate;
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applyFeedbackAudioSampleRate(m_feedbackAudioSampleRate);
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QList<ObjectPipe*> pipes;
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MainCore::instance()->getMessagePipes().getMessagePipes(m_channel, "reportdemod", pipes);
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if (!pipes.empty())
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{
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for (const auto& pipe : pipes)
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{
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MessageQueue* messageQueue = qobject_cast<MessageQueue*>(pipe->m_element);
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MainCore::MsgChannelDemodReport *msg = MainCore::MsgChannelDemodReport::create(m_channel, sampleRate);
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messageQueue->push(msg);
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}
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}
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}
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void NFMModSource::applyFeedbackAudioSampleRate(int sampleRate)
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{
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if (sampleRate < 0)
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{
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qWarning("NFMModSource::applyFeedbackAudioSampleRate: invalid sample rate %d", sampleRate);
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return;
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}
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qDebug("NFMModSource::applyFeedbackAudioSampleRate: %d", sampleRate);
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m_feedbackInterpolatorDistanceRemain = 0;
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m_feedbackInterpolatorConsumed = false;
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m_feedbackInterpolatorDistance = (Real) sampleRate / (Real) m_audioSampleRate;
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Real cutoff = (float) std::min(sampleRate, m_audioSampleRate) / 2.2f;
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m_feedbackInterpolator.create(48, sampleRate, cutoff, 3.0);
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m_feedbackAudioSampleRate = sampleRate;
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}
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void NFMModSource::applySettings(const NFMModSettings& settings, bool force)
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{
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if ((settings.m_rfBandwidth != m_settings.m_rfBandwidth)
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|| (settings.m_afBandwidth != m_settings.m_afBandwidth) || force)
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{
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m_settings.m_rfBandwidth = settings.m_rfBandwidth;
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m_settings.m_afBandwidth = settings.m_afBandwidth;
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applyAudioSampleRate(m_audioSampleRate);
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}
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if ((settings.m_toneFrequency != m_settings.m_toneFrequency) || force) {
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m_toneNco.setFreq(settings.m_toneFrequency, (float) m_audioSampleRate);
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}
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if ((settings.m_ctcssIndex != m_settings.m_ctcssIndex) || force) {
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m_ctcssNco.setFreq(NFMModSettings::getCTCSSFreq(settings.m_ctcssIndex), (float) m_audioSampleRate);
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}
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if ((settings.m_dcsCode != m_settings.m_dcsCode) || force) {
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m_dcsMod.setDCS(settings.m_dcsCode);
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}
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if ((settings.m_dcsPositive != m_settings.m_dcsPositive) || force) {
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m_dcsMod.setPositive(settings.m_dcsPositive);
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}
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if ((settings.m_modAFInput != m_settings.m_modAFInput) || force)
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{
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if (settings.m_modAFInput == NFMModSettings::NFMModInputAudio) {
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connect(&m_audioFifo, SIGNAL(dataReady()), this, SLOT(handleAudio()));
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} else {
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disconnect(&m_audioFifo, SIGNAL(dataReady()), this, SLOT(handleAudio()));
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}
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}
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m_settings = settings;
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}
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void NFMModSource::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
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{
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qDebug() << "NFMModSource::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " channelFrequencyOffset: " << channelFrequencyOffset;
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if ((channelFrequencyOffset != m_channelFrequencyOffset)
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|| (channelSampleRate != m_channelSampleRate) || force)
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{
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m_carrierNco.setFreq((float) channelFrequencyOffset, (float) channelSampleRate);
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}
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if ((channelSampleRate != m_channelSampleRate) || force)
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{
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m_interpolatorDistanceRemain = 0;
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m_interpolatorConsumed = false;
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m_interpolatorDistance = (Real) m_audioSampleRate / (Real) channelSampleRate;
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m_interpolator.create(48, m_audioSampleRate, m_settings.m_rfBandwidth / 2.2, 3.0);
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}
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m_channelSampleRate = channelSampleRate;
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m_channelFrequencyOffset = channelFrequencyOffset;
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}
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void NFMModSource::handleAudio()
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{
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unsigned int nbRead;
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while ((nbRead = m_audioFifo.read(reinterpret_cast<quint8*>(&m_audioReadBuffer[m_audioReadBufferFill]), 4096)) != 0)
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{
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if (m_audioReadBufferFill + nbRead + 4096 < m_audioReadBuffer.size()) {
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m_audioReadBufferFill += nbRead;
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}
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}
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}
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