mirror of
https://github.com/f4exb/sdrangel.git
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259 lines
8.3 KiB
C++
259 lines
8.3 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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#ifndef INCLUDE_AMDEMOD_H
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#define INCLUDE_AMDEMOD_H
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#include <QMutex>
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#include <vector>
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#include "dsp/basebandsamplesink.h"
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#include "channel/channelsinkapi.h"
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#include "dsp/nco.h"
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#include "dsp/interpolator.h"
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#include "util/movingaverage.h"
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#include "dsp/agc.h"
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#include "dsp/bandpass.h"
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#include "audio/audiofifo.h"
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#include "util/message.h"
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#include "util/doublebufferfifo.h"
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#include "amdemodsettings.h"
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class DeviceSourceAPI;
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class DownChannelizer;
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class ThreadedBasebandSampleSink;
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class AMDemod : public BasebandSampleSink, public ChannelSinkAPI {
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Q_OBJECT
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public:
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class MsgConfigureAMDemod : public Message {
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MESSAGE_CLASS_DECLARATION
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public:
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const AMDemodSettings& getSettings() const { return m_settings; }
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bool getForce() const { return m_force; }
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static MsgConfigureAMDemod* create(const AMDemodSettings& settings, bool force)
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{
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return new MsgConfigureAMDemod(settings, force);
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}
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private:
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AMDemodSettings m_settings;
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bool m_force;
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MsgConfigureAMDemod(const AMDemodSettings& settings, bool force) :
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Message(),
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m_settings(settings),
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m_force(force)
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{ }
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};
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class MsgConfigureChannelizer : public Message {
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MESSAGE_CLASS_DECLARATION
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public:
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int getSampleRate() const { return m_sampleRate; }
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int getCenterFrequency() const { return m_centerFrequency; }
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static MsgConfigureChannelizer* create(int sampleRate, int centerFrequency)
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{
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return new MsgConfigureChannelizer(sampleRate, centerFrequency);
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}
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private:
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int m_sampleRate;
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int m_centerFrequency;
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MsgConfigureChannelizer(int sampleRate, int centerFrequency) :
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Message(),
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m_sampleRate(sampleRate),
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m_centerFrequency(centerFrequency)
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{ }
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};
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AMDemod(DeviceSourceAPI *deviceAPI);
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~AMDemod();
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virtual void destroy() { delete this; }
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool po);
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virtual void start();
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virtual void stop();
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virtual bool handleMessage(const Message& cmd);
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virtual void getIdentifier(QString& id) { id = objectName(); }
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virtual void getTitle(QString& title) { title = m_settings.m_title; }
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virtual qint64 getCenterFrequency() const { return m_settings.m_inputFrequencyOffset; }
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virtual QByteArray serialize() const;
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virtual bool deserialize(const QByteArray& data);
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virtual int webapiSettingsGet(
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SWGSDRangel::SWGChannelSettings& response,
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QString& errorMessage);
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virtual int webapiSettingsPutPatch(
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bool force,
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const QStringList& channelSettingsKeys,
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SWGSDRangel::SWGChannelSettings& response,
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QString& errorMessage);
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virtual int webapiReportGet(
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SWGSDRangel::SWGChannelReport& response,
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QString& errorMessage);
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uint32_t getAudioSampleRate() const { return m_audioSampleRate; }
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double getMagSq() const { return m_magsq; }
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bool getSquelchOpen() const { return m_squelchOpen; }
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void getMagSqLevels(double& avg, double& peak, int& nbSamples)
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{
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avg = m_magsqCount == 0 ? 1e-10 : m_magsqSum / m_magsqCount;
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peak = m_magsqPeak == 0.0 ? 1e-10 : m_magsqPeak;
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nbSamples = m_magsqCount == 0 ? 1 : m_magsqCount;
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m_magsqSum = 0.0f;
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m_magsqPeak = 0.0f;
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m_magsqCount = 0;
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}
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static const QString m_channelIdURI;
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static const QString m_channelId;
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private:
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enum RateState {
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RSInitialFill,
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RSRunning
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};
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DeviceSourceAPI *m_deviceAPI;
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ThreadedBasebandSampleSink* m_threadedChannelizer;
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DownChannelizer* m_channelizer;
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int m_inputSampleRate;
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int m_inputFrequencyOffset;
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AMDemodSettings m_settings;
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uint32_t m_audioSampleRate;
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bool m_running;
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NCO m_nco;
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Interpolator m_interpolator;
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Real m_interpolatorDistance;
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Real m_interpolatorDistanceRemain;
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Real m_squelchLevel;
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uint32_t m_squelchCount;
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bool m_squelchOpen;
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DoubleBufferFIFO<Real> m_squelchDelayLine;
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double m_magsq;
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double m_magsqSum;
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double m_magsqPeak;
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int m_magsqCount;
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MovingAverageUtil<Real, double, 16> m_movingAverage;
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SimpleAGC<4096> m_volumeAGC;
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Bandpass<Real> m_bandpass;
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AudioVector m_audioBuffer;
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uint32_t m_audioBufferFill;
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AudioFifo m_audioFifo;
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static const int m_udpBlockSize;
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QMutex m_settingsMutex;
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void applyChannelSettings(int inputSampleRate, int inputFrequencyOffset, bool force = false);
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void applySettings(const AMDemodSettings& settings, bool force = false);
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void applyAudioSampleRate(int sampleRate);
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void webapiFormatChannelSettings(SWGSDRangel::SWGChannelSettings& response, const AMDemodSettings& settings);
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void webapiFormatChannelReport(SWGSDRangel::SWGChannelReport& response);
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void processOneSample(Complex &ci)
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{
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Real re = ci.real() / SDR_RX_SCALEF;
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Real im = ci.imag() / SDR_RX_SCALEF;
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Real magsq = re*re + im*im;
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m_movingAverage(magsq);
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m_magsq = m_movingAverage.asDouble();
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m_magsqSum += magsq;
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if (magsq > m_magsqPeak)
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{
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m_magsqPeak = magsq;
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}
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m_magsqCount++;
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m_squelchDelayLine.write(magsq);
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if (m_magsq < m_squelchLevel)
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{
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if (m_squelchCount > 0) {
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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 < m_audioSampleRate / 10) {
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m_squelchCount++;
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}
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}
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qint16 sample;
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m_squelchOpen = (m_squelchCount >= m_audioSampleRate / 20);
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if (m_squelchOpen && !m_settings.m_audioMute)
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{
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Real demod = sqrt(m_squelchDelayLine.readBack(m_audioSampleRate/20));
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m_volumeAGC.feed(demod);
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demod = (demod - m_volumeAGC.getValue()) / m_volumeAGC.getValue();
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if (m_settings.m_bandpassEnable)
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{
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demod = m_bandpass.filter(demod);
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demod /= 301.0f;
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}
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Real attack = (m_squelchCount - 0.05f * m_audioSampleRate) / (0.05f * m_audioSampleRate);
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sample = demod * attack * (m_audioSampleRate/24) * m_settings.m_volume;
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}
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else
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{
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sample = 0;
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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::processOneSample: %u/%u audio samples written", res, m_audioBufferFill);
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m_audioFifo.clear();
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}
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m_audioBufferFill = 0;
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}
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}
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};
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#endif // INCLUDE_AMDEMOD_H
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