mirror of https://github.com/f4exb/sdrangel.git
274 lines
7.8 KiB
C++
274 lines
7.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015 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 "amdemod.h"
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#include <QTime>
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#include <QDebug>
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#include <stdio.h>
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#include <complex.h>
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#include <dsp/downchannelizer.h>
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#include "audio/audiooutput.h"
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#include "dsp/dspengine.h"
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#include "dsp/pidcontroller.h"
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MESSAGE_CLASS_DEFINITION(AMDemod::MsgConfigureAMDemod, Message)
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AMDemod::AMDemod() :
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m_squelchOpen(false),
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m_audioFifo(4, 48000),
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m_settingsMutex(QMutex::Recursive)
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{
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setObjectName("AMDemod");
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m_config.m_inputSampleRate = 96000;
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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_squelch = -40.0;
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m_config.m_volume = 2.0;
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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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DSPEngine::instance()->addAudioSink(&m_audioFifo);
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}
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AMDemod::~AMDemod()
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{
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DSPEngine::instance()->removeAudioSink(&m_audioFifo);
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}
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void AMDemod::configure(MessageQueue* messageQueue, Real rfBandwidth, Real afBandwidth, Real volume, Real squelch, bool audioMute)
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{
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Message* cmd = MsgConfigureAMDemod::create(rfBandwidth, afBandwidth, volume, squelch, audioMute);
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messageQueue->push(cmd);
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}
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void AMDemod::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst)
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{
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Complex ci;
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m_settingsMutex.lock();
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for (SampleVector::const_iterator it = begin; it != end; ++it)
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{
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//Complex c(it->real() / 32768.0, it->imag() / 32768.0);
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Complex c(it->real(), it->imag());
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c *= m_nco.nextIQ();
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if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
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{
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//m_sampleBuffer.push_back(Sample(ci.real() * 32767.0, ci.imag() * 32767.0));
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m_sampleBuffer.push_back(Sample(ci.real(), ci.imag()));
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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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if (m_magsq >= m_squelchLevel)
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{
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if (m_squelchCount <= m_running.m_audioSampleRate / 10)
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{
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m_squelchCount++;
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}
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}
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else
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{
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if (m_squelchCount > 1)
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{
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m_squelchCount -= 2;
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}
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}
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qint16 sample;
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if ((m_squelchCount >= m_running.m_audioSampleRate / 20) && !m_running.m_audioMute)
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{
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Real demod = sqrt(magsq);
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demod = m_lowpass.filter(demod);
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if (demod < -1)
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{
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demod = -1;
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}
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else if (demod > 1)
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{
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demod = 1;
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}
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m_volumeAGC.feed(demod);
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Real attack = (m_squelchCount - (m_running.m_audioSampleRate / 20)) / (Real) (m_running.m_audioSampleRate / 20);
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demod *= ((0.003 * attack) / m_volumeAGC.getValue());
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demod *= m_running.m_volume;
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sample = demod * 32700 * 16;
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m_squelchOpen = true;
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}
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else
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{
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sample = 0;
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m_squelchOpen = false;
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}
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m_audioBuffer[m_audioBufferFill].l = sample;
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m_audioBuffer[m_audioBufferFill].r = sample;
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++m_audioBufferFill;
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if (m_audioBufferFill >= m_audioBuffer.size())
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{
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uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 10);
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if (res != m_audioBufferFill)
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{
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qDebug("AMDemod::feed: %u/%u audio samples written", res, m_audioBufferFill);
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}
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m_audioBufferFill = 0;
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}
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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if (m_audioBufferFill > 0)
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{
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uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 10);
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if (res != m_audioBufferFill)
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{
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qDebug("AMDemod::feed: %u/%u tail samples written", res, m_audioBufferFill);
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}
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m_audioBufferFill = 0;
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}
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m_sampleBuffer.clear();
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m_settingsMutex.unlock();
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}
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void AMDemod::start()
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{
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qDebug() << "AMDemod::start: m_inputSampleRate: " << m_config.m_inputSampleRate
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<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
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m_squelchCount = 0;
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m_audioFifo.clear();
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}
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void AMDemod::stop()
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{
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}
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bool AMDemod::handleMessage(const Message& cmd)
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{
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qDebug() << "AMDemod::handleMessage";
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if (DownChannelizer::MsgChannelizerNotification::match(cmd))
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{
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DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;
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m_config.m_inputSampleRate = notif.getSampleRate();
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m_config.m_inputFrequencyOffset = notif.getFrequencyOffset();
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apply();
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qDebug() << "AMDemod::handleMessage: MsgChannelizerNotification:"
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<< " m_inputSampleRate: " << m_config.m_inputSampleRate
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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 (MsgConfigureAMDemod::match(cmd))
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{
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MsgConfigureAMDemod& cfg = (MsgConfigureAMDemod&) 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_volume = cfg.getVolume();
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m_config.m_squelch = cfg.getSquelch();
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m_config.m_audioMute = cfg.getAudioMute();
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apply();
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qDebug() << "AMDemod::handleMessage: MsgConfigureAMDemod:"
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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_volume: " << m_config.m_volume
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<< " m_squelch: " << m_config.m_squelch
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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 AMDemod::apply()
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{
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if((m_config.m_inputFrequencyOffset != m_running.m_inputFrequencyOffset) ||
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(m_config.m_inputSampleRate != m_running.m_inputSampleRate))
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{
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m_nco.setFreq(-m_config.m_inputFrequencyOffset, m_config.m_inputSampleRate);
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}
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if((m_config.m_inputSampleRate != m_running.m_inputSampleRate) ||
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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_inputSampleRate, m_config.m_rfBandwidth / 2.2);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) m_config.m_inputSampleRate / (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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if(m_config.m_squelch != m_running.m_squelch)
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{
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m_squelchLevel = pow(10.0, m_config.m_squelch / 20.0);
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m_squelchLevel *= m_squelchLevel;
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}
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m_running.m_inputSampleRate = m_config.m_inputSampleRate;
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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_squelch = m_config.m_squelch;
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m_running.m_volume = m_config.m_volume;
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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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