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sdrangel/plugins/channeltx/modwfm/wfmmod.cpp

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 Edouard Griffiths, F4EXB //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <QTime>
#include <QDebug>
#include <QMutexLocker>
#include <stdio.h>
#include <complex.h>
#include <algorithm>
#include <dsp/upchannelizer.h>
#include "dsp/dspengine.h"
#include "dsp/pidcontroller.h"
#include "wfmmod.h"
MESSAGE_CLASS_DEFINITION(WFMMod::MsgConfigureWFMMod, Message)
MESSAGE_CLASS_DEFINITION(WFMMod::MsgConfigureFileSourceName, Message)
MESSAGE_CLASS_DEFINITION(WFMMod::MsgConfigureFileSourceSeek, Message)
MESSAGE_CLASS_DEFINITION(WFMMod::MsgConfigureAFInput, Message)
MESSAGE_CLASS_DEFINITION(WFMMod::MsgConfigureFileSourceStreamTiming, Message)
MESSAGE_CLASS_DEFINITION(WFMMod::MsgReportFileSourceStreamData, Message)
MESSAGE_CLASS_DEFINITION(WFMMod::MsgReportFileSourceStreamTiming, Message)
const int WFMMod::m_levelNbSamples = 480; // every 10ms
const int WFMMod::m_rfFilterFFTLength = 1024;
WFMMod::WFMMod() :
m_modPhasor(0.0f),
m_audioFifo(4, 48000),
m_settingsMutex(QMutex::Recursive),
m_fileSize(0),
m_recordLength(0),
m_sampleRate(48000),
m_afInput(WFMModInputNone),
m_levelCalcCount(0),
m_peakLevel(0.0f),
m_levelSum(0.0f)
{
setObjectName("WFMod");
m_config.m_outputSampleRate = 384000;
m_config.m_inputFrequencyOffset = 0;
m_config.m_rfBandwidth = 125000;
m_config.m_afBandwidth = 8000;
m_config.m_fmDeviation = 50000.0f;
m_config.m_toneFrequency = 1000.0f;
m_config.m_audioSampleRate = DSPEngine::instance()->getAudioSampleRate();
m_rfFilter = new fftfilt(-62500.0 / 384000.0, 62500.0 / 384000.0, m_rfFilterFFTLength);
m_rfFilterBuffer = new Complex[m_rfFilterFFTLength];
memset(m_rfFilterBuffer, 0, sizeof(Complex)*(m_rfFilterFFTLength));
m_rfFilterBufferIndex = 0;
apply();
m_audioBuffer.resize(1<<14);
m_audioBufferFill = 0;
m_movingAverage.resize(16, 0);
m_volumeAGC.resize(4096, 0.003, 0);
m_magsq = 0.0;
m_toneNco.setFreq(1000.0, m_config.m_audioSampleRate);
m_toneNcoRF.setFreq(1000.0, m_config.m_outputSampleRate);
DSPEngine::instance()->addAudioSource(&m_audioFifo);
// CW keyer
m_cwKeyer.setSampleRate(m_config.m_outputSampleRate);
m_cwSmoother.setNbFadeSamples(m_config.m_outputSampleRate / 250); // 4 ms
m_cwKeyer.setWPM(13);
m_cwKeyer.setMode(CWKeyer::CWNone);
m_cwKeyer.reset();
}
WFMMod::~WFMMod()
{
delete m_rfFilter;
delete[] m_rfFilterBuffer;
DSPEngine::instance()->removeAudioSource(&m_audioFifo);
}
void WFMMod::configure(MessageQueue* messageQueue,
Real rfBandwidth,
Real afBandwidth,
float fmDeviation,
float toneFrequency,
float volumeFactor,
bool channelMute,
bool playLoop)
{
Message* cmd = MsgConfigureWFMMod::create(rfBandwidth, afBandwidth, fmDeviation, toneFrequency, volumeFactor, channelMute, playLoop);
messageQueue->push(cmd);
}
void WFMMod::pull(Sample& sample)
{
if (m_running.m_channelMute)
{
sample.m_real = 0.0f;
sample.m_imag = 0.0f;
return;
}
Complex ci, ri;
Real t;
fftfilt::cmplx *rf;
int rf_out;
m_settingsMutex.lock();
if ((m_afInput == WFMModInputFile) || (m_afInput == WFMModInputAudio))
{
if (m_interpolator.interpolate(&m_interpolatorDistanceRemain, m_modSample, &ri))
{
pullAF(m_modSample);
calculateLevel(m_modSample.real());
m_audioBufferFill++;
}
m_interpolatorDistanceRemain += m_interpolatorDistance;
}
else
{
pullAF(ri);
}
m_modPhasor += (m_running.m_fmDeviation / (float) m_running.m_outputSampleRate) * ri.real() * M_PI * 2.0f;
ci.real(cos(m_modPhasor) * 29204.0f); // -1 dB
ci.imag(sin(m_modPhasor) * 29204.0f);
// RF filtering
rf_out = m_rfFilter->runFilt(ci, &rf);
if (rf_out > 0)
{
memcpy((void *) m_rfFilterBuffer, (const void *) rf, rf_out*sizeof(Complex));
m_rfFilterBufferIndex = 0;
}
ci = m_rfFilterBuffer[m_rfFilterBufferIndex] * m_carrierNco.nextIQ(); // shift to carrier frequency
m_rfFilterBufferIndex++;
m_settingsMutex.unlock();
Real magsq = ci.real() * ci.real() + ci.imag() * ci.imag();
magsq /= (1<<30);
m_movingAverage.feed(magsq);
m_magsq = m_movingAverage.average();
sample.m_real = (FixReal) ci.real();
sample.m_imag = (FixReal) ci.imag();
}
void WFMMod::pullAudio(int nbSamples)
{
int nbSamplesAudio = nbSamples * m_interpolatorDistance;
if (nbSamplesAudio > m_audioBuffer.size())
{
m_audioBuffer.resize(nbSamplesAudio);
}
m_audioFifo.read(reinterpret_cast<quint8*>(&m_audioBuffer[0]), nbSamplesAudio, 10);
m_audioBufferFill = 0;
}
void WFMMod::pullAF(Complex& sample)
{
switch (m_afInput)
{
case WFMModInputTone:
sample.real(m_toneNcoRF.next() * m_running.m_volumeFactor);
sample.imag(0.0f);
break;
case WFMModInputFile:
// sox f4exb_call.wav --encoding float --endian little f4exb_call.raw
// ffplay -f f32le -ar 48k -ac 1 f4exb_call.raw
if (m_ifstream.is_open())
{
if (m_ifstream.eof())
{
if (m_running.m_playLoop)
{
m_ifstream.clear();
m_ifstream.seekg(0, std::ios::beg);
}
}
if (m_ifstream.eof())
{
sample.real(0.0f);
sample.imag(0.0f);
}
else
{
Real s;
m_ifstream.read(reinterpret_cast<char*>(&s), sizeof(Real));
sample.real(s * m_running.m_volumeFactor);
sample.imag(0.0f);
}
}
else
{
sample.real(0.0f);
sample.imag(0.0f);
}
break;
case WFMModInputAudio:
{
sample.real(((m_audioBuffer[m_audioBufferFill].l + m_audioBuffer[m_audioBufferFill].r) / 65536.0f) * m_running.m_volumeFactor);
sample.imag(0.0f);
}
break;
case WFMModInputCWTone:
Real fadeFactor;
if (m_cwKeyer.getSample())
{
m_cwSmoother.getFadeSample(true, fadeFactor);
sample.real(m_toneNcoRF.next() * m_running.m_volumeFactor * fadeFactor);
sample.imag(0.0f);
}
else
{
if (m_cwSmoother.getFadeSample(false, fadeFactor))
{
sample.real(m_toneNcoRF.next() * m_running.m_volumeFactor * fadeFactor);
sample.imag(0.0f);
}
else
{
sample.real(0.0f);
sample.imag(0.0f);
m_toneNcoRF.setPhase(0);
}
}
break;
case WFMModInputNone:
default:
sample.real(0.0f);
sample.imag(0.0f);
break;
}
}
void WFMMod::calculateLevel(const Real& sample)
{
if (m_levelCalcCount < m_levelNbSamples)
{
m_peakLevel = std::max(std::fabs(m_peakLevel), sample);
m_levelSum += sample * sample;
m_levelCalcCount++;
}
else
{
qreal rmsLevel = sqrt(m_levelSum / m_levelNbSamples);
//qDebug("WFMMod::calculateLevel: %f %f", rmsLevel, m_peakLevel);
emit levelChanged(rmsLevel, m_peakLevel, m_levelNbSamples);
m_peakLevel = 0.0f;
m_levelSum = 0.0f;
m_levelCalcCount = 0;
}
}
void WFMMod::start()
{
qDebug() << "WFMMod::start: m_outputSampleRate: " << m_config.m_outputSampleRate
<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
m_audioFifo.clear();
}
void WFMMod::stop()
{
}
bool WFMMod::handleMessage(const Message& cmd)
{
if (UpChannelizer::MsgChannelizerNotification::match(cmd))
{
UpChannelizer::MsgChannelizerNotification& notif = (UpChannelizer::MsgChannelizerNotification&) cmd;
m_config.m_outputSampleRate = notif.getSampleRate();
m_config.m_inputFrequencyOffset = notif.getFrequencyOffset();
apply();
qDebug() << "WFMMod::handleMessage: MsgChannelizerNotification:"
<< " m_outputSampleRate: " << m_config.m_outputSampleRate
<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
return true;
}
else if (MsgConfigureWFMMod::match(cmd))
{
MsgConfigureWFMMod& cfg = (MsgConfigureWFMMod&) cmd;
m_config.m_rfBandwidth = cfg.getRFBandwidth();
m_config.m_afBandwidth = cfg.getAFBandwidth();
m_config.m_fmDeviation = cfg.getFMDeviation();
m_config.m_toneFrequency = cfg.getToneFrequency();
m_config.m_volumeFactor = cfg.getVolumeFactor();
m_config.m_channelMute = cfg.getChannelMute();
m_config.m_playLoop = cfg.getPlayLoop();
apply();
qDebug() << "WFMMod::handleMessage: MsgConfigureWFMMod:"
<< " m_rfBandwidth: " << m_config.m_rfBandwidth
<< " m_afBandwidth: " << m_config.m_afBandwidth
<< " m_fmDeviation: " << m_config.m_fmDeviation
<< " m_toneFrequency: " << m_config.m_toneFrequency
<< " m_volumeFactor: " << m_config.m_volumeFactor
<< " m_channelMute: " << m_config.m_channelMute
<< " m_playLoop: " << m_config.m_playLoop;
return true;
}
else if (MsgConfigureFileSourceName::match(cmd))
{
MsgConfigureFileSourceName& conf = (MsgConfigureFileSourceName&) cmd;
m_fileName = conf.getFileName();
openFileStream();
return true;
}
else if (MsgConfigureFileSourceSeek::match(cmd))
{
MsgConfigureFileSourceSeek& conf = (MsgConfigureFileSourceSeek&) cmd;
int seekPercentage = conf.getPercentage();
seekFileStream(seekPercentage);
return true;
}
else if (MsgConfigureAFInput::match(cmd))
{
MsgConfigureAFInput& conf = (MsgConfigureAFInput&) cmd;
m_afInput = conf.getAFInput();
return true;
}
else if (MsgConfigureFileSourceStreamTiming::match(cmd))
{
std::size_t samplesCount;
if (m_ifstream.eof()) {
samplesCount = m_fileSize / sizeof(Real);
} else {
samplesCount = m_ifstream.tellg() / sizeof(Real);
}
MsgReportFileSourceStreamTiming *report;
report = MsgReportFileSourceStreamTiming::create(samplesCount);
getOutputMessageQueue()->push(report);
return true;
}
else
{
return false;
}
}
void WFMMod::apply()
{
if ((m_config.m_inputFrequencyOffset != m_running.m_inputFrequencyOffset) ||
(m_config.m_outputSampleRate != m_running.m_outputSampleRate))
{
m_settingsMutex.lock();
m_carrierNco.setFreq(m_config.m_inputFrequencyOffset, m_config.m_outputSampleRate);
m_settingsMutex.unlock();
}
if((m_config.m_outputSampleRate != m_running.m_outputSampleRate) ||
(m_config.m_audioSampleRate != m_running.m_audioSampleRate) ||
(m_config.m_afBandwidth != m_running.m_afBandwidth))
{
m_settingsMutex.lock();
m_interpolatorDistanceRemain = 0;
m_interpolatorConsumed = false;
m_interpolatorDistance = (Real) m_config.m_audioSampleRate / (Real) m_config.m_outputSampleRate;
m_interpolator.create(48, m_config.m_audioSampleRate, m_config.m_rfBandwidth / 2.2, 3.0);
m_settingsMutex.unlock();
}
if ((m_config.m_rfBandwidth != m_running.m_rfBandwidth) ||
(m_config.m_outputSampleRate != m_running.m_outputSampleRate))
{
m_settingsMutex.lock();
Real lowCut = -(m_config.m_rfBandwidth / 2.0) / m_config.m_outputSampleRate;
Real hiCut = (m_config.m_rfBandwidth / 2.0) / m_config.m_outputSampleRate;
m_rfFilter->create_filter(lowCut, hiCut);
m_settingsMutex.unlock();
}
if ((m_config.m_toneFrequency != m_running.m_toneFrequency) ||
(m_config.m_audioSampleRate != m_running.m_audioSampleRate))
{
m_settingsMutex.lock();
m_toneNco.setFreq(m_config.m_toneFrequency, m_config.m_audioSampleRate);
m_settingsMutex.unlock();
}
if ((m_config.m_toneFrequency != m_running.m_toneFrequency) ||
(m_config.m_outputSampleRate != m_running.m_outputSampleRate))
{
m_settingsMutex.lock();
m_toneNcoRF.setFreq(m_config.m_toneFrequency, m_config.m_outputSampleRate);
m_settingsMutex.unlock();
}
if (m_config.m_outputSampleRate != m_running.m_outputSampleRate)
{
m_cwKeyer.setSampleRate(m_config.m_outputSampleRate);
m_cwSmoother.setNbFadeSamples(m_config.m_outputSampleRate / 250); // 4 ms
m_cwKeyer.reset();
}
m_running.m_outputSampleRate = m_config.m_outputSampleRate;
m_running.m_inputFrequencyOffset = m_config.m_inputFrequencyOffset;
m_running.m_rfBandwidth = m_config.m_rfBandwidth;
m_running.m_afBandwidth = m_config.m_afBandwidth;
m_running.m_fmDeviation = m_config.m_fmDeviation;
m_running.m_volumeFactor = m_config.m_volumeFactor;
m_running.m_audioSampleRate = m_config.m_audioSampleRate;
m_running.m_channelMute = m_config.m_channelMute;
m_running.m_playLoop = m_config.m_playLoop;
}
void WFMMod::openFileStream()
{
if (m_ifstream.is_open()) {
m_ifstream.close();
}
m_ifstream.open(m_fileName.toStdString().c_str(), std::ios::binary | std::ios::ate);
m_fileSize = m_ifstream.tellg();
m_ifstream.seekg(0,std::ios_base::beg);
m_sampleRate = 48000; // fixed rate
m_recordLength = m_fileSize / (sizeof(Real) * m_sampleRate);
qDebug() << "WFMMod::openFileStream: " << m_fileName.toStdString().c_str()
<< " fileSize: " << m_fileSize << "bytes"
<< " length: " << m_recordLength << " seconds";
MsgReportFileSourceStreamData *report;
report = MsgReportFileSourceStreamData::create(m_sampleRate, m_recordLength);
getOutputMessageQueue()->push(report);
}
void WFMMod::seekFileStream(int seekPercentage)
{
QMutexLocker mutexLocker(&m_settingsMutex);
if (m_ifstream.is_open())
{
int seekPoint = ((m_recordLength * seekPercentage) / 100) * m_sampleRate;
seekPoint *= sizeof(Real);
m_ifstream.clear();
m_ifstream.seekg(seekPoint, std::ios::beg);
}
}
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