mirror of
https://github.com/f4exb/sdrangel.git
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183 lines
5.6 KiB
C++
183 lines
5.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016 Edouard Griffiths, F4EXB //
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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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// //
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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 "ammod.h"
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#include <QTime>
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#include <QDebug>
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#include <QMutexLocker>
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#include <stdio.h>
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#include <complex.h>
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#include <dsp/upchannelizer.h>
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#include "dsp/dspengine.h"
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#include "dsp/pidcontroller.h"
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MESSAGE_CLASS_DEFINITION(AMMod::MsgConfigureAMMod, Message)
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AMMod::AMMod() :
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m_settingsMutex(QMutex::Recursive)
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{
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setObjectName("AMMod");
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m_config.m_outputSampleRate = 48000;
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m_config.m_inputFrequencyOffset = 0;
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m_config.m_rfBandwidth = 12500;
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m_config.m_afBandwidth = 3000;
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m_config.m_modFactor = 20;
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m_config.m_audioSampleRate = DSPEngine::instance()->getAudioSampleRate();
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apply();
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m_audioBuffer.resize(1<<14);
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m_audioBufferFill = 0;
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m_movingAverage.resize(16, 0);
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m_volumeAGC.resize(4096, 0.003, 0);
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m_magsq = 0.0;
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m_toneNco.setFreq(1000.0, m_config.m_audioSampleRate);
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}
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AMMod::~AMMod()
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{
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}
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void AMMod::configure(MessageQueue* messageQueue, Real rfBandwidth, Real afBandwidth, float modFactor, bool audioMute)
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{
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Message* cmd = MsgConfigureAMMod::create(rfBandwidth, afBandwidth, modFactor, audioMute);
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messageQueue->push(cmd);
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}
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void AMMod::pull(Sample& sample)
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{
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Complex ci;
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if (m_interpolator.interpolate(&m_interpolatorDistanceRemain, m_modSample, &ci))
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{
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m_settingsMutex.lock();
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m_carrierNco.nextPhase();
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m_toneNco.nextPhase();
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m_settingsMutex.unlock();
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m_carrierNco.getIQ(m_modSample);
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Real t = m_toneNco.get();
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m_modSample *= (t+1.0f) * m_running.m_modFactor * 16384.0f; // modulate and scale carrier
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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Real magsq = ci.real() * ci.real() + ci.imag() * ci.imag();
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magsq /= (1<<30);
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m_movingAverage.feed(magsq);
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m_magsq = m_movingAverage.average();
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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 AMMod::start()
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{
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qDebug() << "AMMod::start: m_outputSampleRate: " << m_config.m_outputSampleRate
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<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
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m_audioFifo.clear();
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}
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void AMMod::stop()
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{
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}
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bool AMMod::handleMessage(const Message& cmd)
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{
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qDebug() << "AMMod::handleMessage";
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if (UpChannelizer::MsgChannelizerNotification::match(cmd))
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{
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UpChannelizer::MsgChannelizerNotification& notif = (UpChannelizer::MsgChannelizerNotification&) cmd;
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m_config.m_outputSampleRate = notif.getSampleRate();
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m_config.m_inputFrequencyOffset = notif.getFrequencyOffset();
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apply();
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qDebug() << "AMMod::handleMessage: MsgChannelizerNotification:"
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<< " m_outputSampleRate: " << m_config.m_outputSampleRate
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<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
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return true;
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}
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else if (MsgConfigureAMMod::match(cmd))
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{
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MsgConfigureAMMod& cfg = (MsgConfigureAMMod&) cmd;
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m_config.m_rfBandwidth = cfg.getRFBandwidth();
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m_config.m_afBandwidth = cfg.getAFBandwidth();
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m_config.m_modFactor = cfg.getModFactor();
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m_config.m_audioMute = cfg.getAudioMute();
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apply();
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qDebug() << "AMMod::handleMessage: MsgConfigureAMMod:"
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<< " m_rfBandwidth: " << m_config.m_rfBandwidth
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<< " m_afBandwidth: " << m_config.m_afBandwidth
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<< " m_modFactor: " << m_config.m_modFactor
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<< " m_audioMute: " << m_config.m_audioMute;
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return true;
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}
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else
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{
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return false;
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}
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}
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void AMMod::apply()
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{
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if(m_config.m_inputFrequencyOffset != m_running.m_inputFrequencyOffset)
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{
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m_carrierNco.setFreq(m_config.m_inputFrequencyOffset, m_config.m_audioSampleRate);
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}
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if((m_config.m_outputSampleRate != m_running.m_outputSampleRate) ||
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(m_config.m_rfBandwidth != m_running.m_rfBandwidth))
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{
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m_settingsMutex.lock();
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m_interpolator.create(16, m_config.m_outputSampleRate, m_config.m_rfBandwidth / 2.2);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) m_config.m_outputSampleRate / (Real) m_config.m_audioSampleRate;
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m_settingsMutex.unlock();
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}
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if((m_config.m_afBandwidth != m_running.m_afBandwidth) ||
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(m_config.m_audioSampleRate != m_running.m_audioSampleRate))
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{
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m_settingsMutex.lock();
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m_lowpass.create(21, m_config.m_audioSampleRate, m_config.m_afBandwidth);
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m_settingsMutex.unlock();
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}
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m_running.m_outputSampleRate = m_config.m_outputSampleRate;
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m_running.m_inputFrequencyOffset = m_config.m_inputFrequencyOffset;
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m_running.m_rfBandwidth = m_config.m_rfBandwidth;
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m_running.m_afBandwidth = m_config.m_afBandwidth;
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m_running.m_modFactor = m_config.m_modFactor;
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m_running.m_audioSampleRate = m_config.m_audioSampleRate;
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m_running.m_audioMute = m_config.m_audioMute;
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}
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