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117 lines
4.3 KiB
C++
117 lines
4.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// (c) 2014 John Greb //
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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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 <QTime>
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#include <stdio.h>
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#include "wfmdemod.h"
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#include "audio/audiooutput.h"
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#include "dsp/dspcommands.h"
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MESSAGE_CLASS_DEFINITION(WFMDemod::MsgConfigureWFMDemod, Message)
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WFMDemod::WFMDemod(AudioFifo* audioFifo, SampleSink* sampleSink) :
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m_sampleSink(sampleSink),
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m_audioFifo(audioFifo)
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{
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m_volume = 2.0;
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m_sampleRate = 250000;
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m_frequency = 0;
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m_interpolator.create(16, m_sampleRate, 16000);
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m_sampleDistanceRemain = (Real)m_sampleRate / 48000.0;
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m_audioBuffer.resize(256);
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m_audioBufferFill = 0;
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m_scale = 0;
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}
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WFMDemod::~WFMDemod()
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{
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}
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void WFMDemod::configure(MessageQueue* messageQueue, Real afBandwidth, Real volume)
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{
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Message* cmd = MsgConfigureWFMDemod::create(afBandwidth, volume);
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cmd->submit(messageQueue, this);
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}
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void WFMDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
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{
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qint16 sample;
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Real x, y, demod;
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for(SampleVector::const_iterator it = begin; it < end; ++it) {
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x = it->real() * m_last.real() + it->imag() * m_last.imag();
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y = it->real() * m_last.imag() - it->imag() * m_last.real();
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m_last = Complex(it->real(), it->imag());
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demod = atan2(y, x);
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Complex e(demod, 0);
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Complex c;
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if(m_interpolator.interpolate(&m_sampleDistanceRemain, e, &c)) {
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sample = (qint16)(c.real() * 100 * m_volume * m_volume);
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m_sampleBuffer.push_back(Sample(sample, sample));
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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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uint res = m_audioFifo->write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 1);
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if(res != m_audioBufferFill)
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qDebug("lost %u samples", m_audioBufferFill - res);
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m_audioBufferFill = 0;
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}
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m_sampleDistanceRemain += (Real)m_sampleRate / 48000.0;
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}
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}
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if(m_audioFifo->write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 0) != m_audioBufferFill)
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qDebug("lost samples");
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m_audioBufferFill = 0;
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if(m_sampleSink != NULL)
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m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), true);
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m_sampleBuffer.clear();
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}
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void WFMDemod::start() {}
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void WFMDemod::stop() {}
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bool WFMDemod::handleMessage(Message* cmd)
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{
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if(DSPSignalNotification::match(cmd)) {
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DSPSignalNotification* signal = (DSPSignalNotification*)cmd;
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qDebug("%d samples/sec, %lld Hz offset", signal->getSampleRate(), signal->getFrequencyOffset());
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m_sampleRate = signal->getSampleRate();
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m_interpolator.create(16, m_sampleRate, m_afBandwidth);
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m_sampleDistanceRemain = m_sampleRate / 48000.0;
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cmd->completed();
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return true;
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} else if(MsgConfigureWFMDemod::match(cmd)) {
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MsgConfigureWFMDemod* cfg = (MsgConfigureWFMDemod*)cmd;
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m_afBandwidth = cfg->getAFBandwidth();
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m_interpolator.create(16, m_sampleRate, m_afBandwidth);
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m_volume = cfg->getVolume();
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cmd->completed();
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return true;
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} else {
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if(m_sampleSink != NULL)
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return m_sampleSink->handleMessage(cmd);
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else return false;
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}
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}
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