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sdrangel/plugins/channeltx/modam/ammod.cpp

203 lines
6.4 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// 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 "ammod.h"
#include <QTime>
#include <QDebug>
#include <QMutexLocker>
#include <stdio.h>
#include <complex.h>
#include <dsp/upchannelizer.h>
#include "dsp/dspengine.h"
#include "dsp/pidcontroller.h"
MESSAGE_CLASS_DEFINITION(AMMod::MsgConfigureAMMod, Message)
AMMod::AMMod() :
m_settingsMutex(QMutex::Recursive)
{
setObjectName("AMMod");
m_config.m_outputSampleRate = 48000;
m_config.m_inputFrequencyOffset = 0;
m_config.m_rfBandwidth = 12500;
m_config.m_afBandwidth = 3000;
m_config.m_modFactor = 20;
m_config.m_audioSampleRate = DSPEngine::instance()->getAudioSampleRate();
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);
}
AMMod::~AMMod()
{
}
void AMMod::configure(MessageQueue* messageQueue, Real rfBandwidth, Real afBandwidth, float modFactor, bool audioMute)
{
Message* cmd = MsgConfigureAMMod::create(rfBandwidth, afBandwidth, modFactor, audioMute);
messageQueue->push(cmd);
}
void AMMod::pull(Sample& sample)
{
Complex ci;
m_settingsMutex.lock();
if (m_interpolatorDistance > 1.0f) // decimate
{
Real t = m_toneNco.next();
m_modSample.real(((t+1.0f) * m_running.m_modFactor * 16384.0f)); // modulate and scale zero frequency carrier
m_modSample.imag(0.0f);
while (!m_interpolator.decimate(&m_interpolatorDistanceRemain, m_modSample, &ci))
{
Real t = m_toneNco.next();
m_modSample.real(((t+1.0f) * m_running.m_modFactor * 16384.0f)); // modulate and scale zero frequency carrier
m_modSample.imag(0.0f);
}
}
else
{
if (m_interpolator.interpolate(&m_interpolatorDistanceRemain, m_modSample, &ci))
{
Real t = m_toneNco.next();
m_modSample.real(((t+1.0f) * m_running.m_modFactor * 16384.0f)); // modulate and scale zero frequency carrier
m_modSample.imag(0.0f);
}
}
m_interpolatorDistanceRemain += m_interpolatorDistance;
ci *= m_carrierNco.nextIQ(); // shift to carrier frequency
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 AMMod::start()
{
qDebug() << "AMMod::start: m_outputSampleRate: " << m_config.m_outputSampleRate
<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
m_audioFifo.clear();
}
void AMMod::stop()
{
}
bool AMMod::handleMessage(const Message& cmd)
{
qDebug() << "AMMod::handleMessage";
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() << "AMMod::handleMessage: MsgChannelizerNotification:"
<< " m_outputSampleRate: " << m_config.m_outputSampleRate
<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
return true;
}
else if (MsgConfigureAMMod::match(cmd))
{
MsgConfigureAMMod& cfg = (MsgConfigureAMMod&) cmd;
m_config.m_rfBandwidth = cfg.getRFBandwidth();
m_config.m_afBandwidth = cfg.getAFBandwidth();
m_config.m_modFactor = cfg.getModFactor();
m_config.m_audioMute = cfg.getAudioMute();
apply();
qDebug() << "AMMod::handleMessage: MsgConfigureAMMod:"
<< " m_rfBandwidth: " << m_config.m_rfBandwidth
<< " m_afBandwidth: " << m_config.m_afBandwidth
<< " m_modFactor: " << m_config.m_modFactor
<< " m_audioMute: " << m_config.m_audioMute;
return true;
}
else
{
return false;
}
}
void AMMod::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_rfBandwidth != m_running.m_rfBandwidth))
{
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_outputSampleRate, m_config.m_rfBandwidth / 2.2, 3.0);
m_settingsMutex.unlock();
}
if((m_config.m_afBandwidth != m_running.m_afBandwidth) ||
(m_config.m_audioSampleRate != m_running.m_audioSampleRate))
{
m_settingsMutex.lock();
m_lowpass.create(21, m_config.m_audioSampleRate, m_config.m_afBandwidth);
m_settingsMutex.unlock();
}
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_modFactor = m_config.m_modFactor;
m_running.m_audioSampleRate = m_config.m_audioSampleRate;
m_running.m_audioMute = m_config.m_audioMute;
}