sdrangel/plugins/channelrx/demodadsb/adsbdemodbaseband.cpp

168 wiersze
5.7 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
// Copyright (C) 2020 Jon Beniston, M7RCE //
// //
// 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 //
// (at your option) any later version. //
// //
// 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 <QDebug>
#include "dsp/dspengine.h"
#include "dsp/dspcommands.h"
#include "dsp/downchannelizer.h"
#include "adsbdemodbaseband.h"
#include "adsb.h"
MESSAGE_CLASS_DEFINITION(ADSBDemodBaseband::MsgConfigureADSBDemodBaseband, Message)
ADSBDemodBaseband::ADSBDemodBaseband() :
m_mutex(QMutex::Recursive)
{
m_sampleFifo.setSize(SampleSinkFifo::getSizePolicy(8000000));
m_channelizer = new DownChannelizer(&m_sink);
qDebug("ADSBDemodBaseband::ADSBDemodBaseband");
QObject::connect(
&m_sampleFifo,
&SampleSinkFifo::dataReady,
this,
&ADSBDemodBaseband::handleData,
Qt::QueuedConnection
);
connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
}
ADSBDemodBaseband::~ADSBDemodBaseband()
{
delete m_channelizer;
}
void ADSBDemodBaseband::reset()
{
QMutexLocker mutexLocker(&m_mutex);
m_sampleFifo.reset();
}
void ADSBDemodBaseband::startWork()
{
m_sink.startWorker();
}
void ADSBDemodBaseband::stopWork()
{
m_sink.stopWorker();
}
void ADSBDemodBaseband::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
{
m_sampleFifo.write(begin, end);
}
void ADSBDemodBaseband::handleData()
{
QMutexLocker mutexLocker(&m_mutex);
while ((m_sampleFifo.fill() > 0) && (m_inputMessageQueue.size() == 0))
{
SampleVector::iterator part1begin;
SampleVector::iterator part1end;
SampleVector::iterator part2begin;
SampleVector::iterator part2end;
std::size_t count = m_sampleFifo.readBegin(m_sampleFifo.fill(), &part1begin, &part1end, &part2begin, &part2end);
// first part of FIFO data
if (part1begin != part1end) {
m_channelizer->feed(part1begin, part1end);
}
// second part of FIFO data (used when block wraps around)
if(part2begin != part2end) {
m_channelizer->feed(part2begin, part2end);
}
m_sampleFifo.readCommit((unsigned int) count);
}
}
void ADSBDemodBaseband::handleInputMessages()
{
Message* message;
while ((message = m_inputMessageQueue.pop()) != nullptr)
{
if (handleMessage(*message)) {
delete message;
}
}
}
bool ADSBDemodBaseband::handleMessage(const Message& cmd)
{
if (MsgConfigureADSBDemodBaseband::match(cmd))
{
QMutexLocker mutexLocker(&m_mutex);
MsgConfigureADSBDemodBaseband& cfg = (MsgConfigureADSBDemodBaseband&) cmd;
qDebug() << "ADSBDemodBaseband::handleMessage: MsgConfigureADSBDemodBaseband";
applySettings(cfg.getSettings(), cfg.getForce());
return true;
}
else if (DSPSignalNotification::match(cmd))
{
QMutexLocker mutexLocker(&m_mutex);
DSPSignalNotification& notif = (DSPSignalNotification&) cmd;
qDebug() << "ADSBDemodBaseband::handleMessage: DSPSignalNotification: basebandSampleRate: " << notif.getSampleRate();
m_sampleFifo.setSize(SampleSinkFifo::getSizePolicy(8*notif.getSampleRate())); // Need a large FIFO otherwise we get overflows - revist after better upsampling
m_channelizer->setBasebandSampleRate(notif.getSampleRate());
m_sink.applyChannelSettings(m_channelizer->getChannelSampleRate(), m_channelizer->getChannelFrequencyOffset());
return true;
}
else
{
return false;
}
}
void ADSBDemodBaseband::applySettings(const ADSBDemodSettings& settings, bool force)
{
if ((settings.m_inputFrequencyOffset != m_settings.m_inputFrequencyOffset)
|| (settings.m_samplesPerBit != m_settings.m_samplesPerBit) || force)
{
int requestedRate = ADS_B_BITS_PER_SECOND * settings.m_samplesPerBit;
m_channelizer->setChannelization(requestedRate, settings.m_inputFrequencyOffset);
m_sink.applyChannelSettings(m_channelizer->getChannelSampleRate(), m_channelizer->getChannelFrequencyOffset());
}
m_sink.applySettings(settings, force);
m_settings = settings;
}
int ADSBDemodBaseband::getChannelSampleRate() const
{
return m_channelizer->getChannelSampleRate();
}
void ADSBDemodBaseband::setBasebandSampleRate(int sampleRate)
{
m_channelizer->setBasebandSampleRate(sampleRate);
m_sink.applyChannelSettings(m_channelizer->getChannelSampleRate(), m_channelizer->getChannelFrequencyOffset());
}