Rebase to master

plugins/samplesource/audioinput/CMakeLists.txt

@@ -0,0 +1,57 @@
+project(audioinput)
+
+set(audioinput_SOURCES
+    audioinput.cpp
+    audioinputplugin.cpp
+    audioinputsettings.cpp
+    audioinputwebapiadapter.cpp
+    audioinputthread.cpp
+)
+
+set(audioinput_HEADERS
+    audioinput.h
+    audioinputplugin.h
+    audioinputsettings.h
+    audioinputwebapiadapter.h
+    audioinputthread.h
+)
+
+include_directories(
+    ${CMAKE_SOURCE_DIR}/swagger/sdrangel/code/qt5/client
+)
+
+if(NOT SERVER_MODE)
+    set(audioinput_SOURCES
+        ${audioinput_SOURCES}
+        audioinputgui.cpp
+        audioinputgui.ui
+    )
+    set(audioinput_HEADERS
+        ${audioinput_HEADERS}
+        audioinputgui.h
+    )
+
+    set(TARGET_NAME inputaudio)
+    set(TARGET_LIB "Qt5::Widgets")
+    set(TARGET_LIB_GUI "sdrgui")
+    set(INSTALL_FOLDER ${INSTALL_PLUGINS_DIR})
+else()
+    set(TARGET_NAME inputaudiosrv)
+    set(TARGET_LIB "")
+    set(TARGET_LIB_GUI "")
+    set(INSTALL_FOLDER ${INSTALL_PLUGINSSRV_DIR})
+endif()
+
+add_library(${TARGET_NAME} SHARED
+    ${audioinput_SOURCES}
+)
+
+target_link_libraries(${TARGET_NAME}
+    Qt5::Core
+    ${TARGET_LIB}
+    sdrbase
+    ${TARGET_LIB_GUI}
+    swagger
+)
+
+install(TARGETS ${TARGET_NAME} DESTINATION ${INSTALL_FOLDER})

plugins/samplesource/audioinput/audioinput.cpp

@@ -0,0 +1,519 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015-2018 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 <string.h>
+#include <errno.h>
+
+#include <QDebug>
+#include <QNetworkReply>
+#include <QBuffer>
+
+#include "SWGDeviceSettings.h"
+#include "SWGDeviceState.h"
+
+#include "dsp/dspcommands.h"
+#include "dsp/dspengine.h"
+#include "device/deviceapi.h"
+
+#include "audioinput.h"
+#include "audioinputthread.h"
+
+MESSAGE_CLASS_DEFINITION(AudioInputSource::AudioInput::MsgConfigureAudioInput, Message)
+MESSAGE_CLASS_DEFINITION(AudioInputSource::AudioInput::MsgStartStop, Message)
+
+namespace AudioInputSource {
+
+AudioInput::AudioInput(DeviceAPI *deviceAPI) :
+    m_deviceAPI(deviceAPI),
+    m_settings(),
+    m_thread(nullptr),
+    m_deviceDescription("AudioInput"),
+    m_running(false)
+{
+    m_fifo.setSize(20*AudioInputThread::m_convBufSamples);
+    openDevice();
+    m_deviceAPI->setNbSourceStreams(1);
+    m_networkManager = new QNetworkAccessManager();
+    connect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
+}
+
+AudioInput::~AudioInput()
+{
+    disconnect(m_networkManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(networkManagerFinished(QNetworkReply*)));
+    delete m_networkManager;
+
+    if (m_running) {
+        stop();
+    }
+
+    closeDevice();
+}
+
+void AudioInput::destroy()
+{
+    delete this;
+}
+
+bool AudioInput::openDevice()
+{
+    if (!openAudioDevice(m_settings.m_deviceName, m_settings.m_sampleRate))
+    {
+        qCritical("AudioInput::openDevice: could not open audio source");
+        return false;
+    }
+    else
+        return true;
+}
+
+bool AudioInput::openAudioDevice(QString deviceName, qint32 sampleRate)
+{
+    AudioDeviceManager *audioDeviceManager = DSPEngine::instance()->getAudioDeviceManager();
+    const QList<QAudioDeviceInfo>& audioList = audioDeviceManager->getInputDevices();
+
+    for (const auto &itAudio : audioList)
+    {
+        if (AudioInputSettings::getFullDeviceName(itAudio) == deviceName)
+        {
+            // FIXME: getInputDeviceIndex needs a realm parameter (itAudio.realm()) - need to look on Linux to see if it uses default?
+            int deviceIndex = audioDeviceManager->getInputDeviceIndex(itAudio.deviceName());
+            m_audioInput.start(deviceIndex, sampleRate);
+            m_audioInput.addFifo(&m_fifo);
+            return true;
+        }
+    }
+    return false;
+}
+
+void AudioInput::init()
+{
+    applySettings(m_settings, true);
+}
+
+bool AudioInput::start()
+{
+    qDebug() << "AudioInput::start";
+
+    if (m_running) stop();
+
+    if(!m_sampleFifo.setSize(96000*4))
+    {
+        qCritical("Could not allocate SampleFifo");
+        return false;
+    }
+
+    m_thread = new AudioInputThread(&m_sampleFifo, &m_fifo);
+    m_thread->setLog2Decimation(m_settings.m_log2Decim);
+    m_thread->setIQMapping(m_settings.m_iqMapping);
+    m_thread->startWork();
+
+    applySettings(m_settings, true);
+
+    qDebug("AudioInput::started");
+    m_running = true;
+
+    return true;
+}
+
+void AudioInput::closeDevice()
+{
+    m_audioInput.removeFifo(&m_fifo);
+    m_audioInput.stop();
+}
+
+void AudioInput::stop()
+{
+    if (m_thread)
+    {
+        m_thread->stopWork();
+        // wait for thread to quit ?
+        delete m_thread;
+        m_thread = nullptr;
+    }
+
+    m_running = false;
+}
+
+QByteArray AudioInput::serialize() const
+{
+    return m_settings.serialize();
+}
+
+bool AudioInput::deserialize(const QByteArray& data)
+{
+    bool success = true;
+
+    if (!m_settings.deserialize(data))
+    {
+        m_settings.resetToDefaults();
+        success = false;
+    }
+
+    MsgConfigureAudioInput* message = MsgConfigureAudioInput::create(m_settings, true);
+    m_inputMessageQueue.push(message);
+
+    if (m_guiMessageQueue)
+    {
+        MsgConfigureAudioInput* messageToGUI = MsgConfigureAudioInput::create(m_settings, true);
+        m_guiMessageQueue->push(messageToGUI);
+    }
+
+    return success;
+}
+
+const QString& AudioInput::getDeviceDescription() const
+{
+    return m_deviceDescription;
+}
+
+int AudioInput::getSampleRate() const
+{
+    return m_settings.m_sampleRate/(1<<m_settings.m_log2Decim);
+}
+
+quint64 AudioInput::getCenterFrequency() const
+{
+    return 0;
+}
+
+void AudioInput::setCenterFrequency(qint64 centerFrequency)
+{
+}
+
+bool AudioInput::handleMessage(const Message& message)
+{
+    if(MsgConfigureAudioInput::match(message))
+    {
+        qDebug() << "AudioInput::handleMessage: MsgConfigureAudioInput";
+        MsgConfigureAudioInput& conf = (MsgConfigureAudioInput&) message;
+        applySettings(conf.getSettings(), conf.getForce());
+        return true;
+    }
+    else if (MsgStartStop::match(message))
+    {
+        MsgStartStop& cmd = (MsgStartStop&) message;
+        qDebug() << "AudioInput::handleMessage: MsgStartStop: " << (cmd.getStartStop() ? "start" : "stop");
+
+        if (cmd.getStartStop())
+        {
+            if (m_deviceAPI->initDeviceEngine())
+            {
+                m_deviceAPI->startDeviceEngine();
+            }
+        }
+        else
+        {
+            m_deviceAPI->stopDeviceEngine();
+        }
+
+        if (m_settings.m_useReverseAPI) {
+            webapiReverseSendStartStop(cmd.getStartStop());
+        }
+
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+void AudioInput::applySettings(const AudioInputSettings& settings, bool force)
+{
+    bool forwardChange = false;
+    QList<QString> reverseAPIKeys;
+
+    if ((m_settings.m_deviceName != settings.m_deviceName)
+        || (m_settings.m_sampleRate != settings.m_sampleRate) || force)
+    {
+        closeDevice();
+        if (openAudioDevice(settings.m_deviceName, settings.m_sampleRate))
+            qDebug() << "AudioInput::applySettings: opened device " << settings.m_deviceName << " with sample rate " << m_audioInput.getRate();
+        else
+            qCritical() << "AudioInput::applySettings: failed to open device " << settings.m_deviceName;
+    }
+
+    if ((m_settings.m_deviceName != settings.m_deviceName) || force)
+    {
+        //reverseAPIKeys.append("device");
+    }
+
+    if ((m_settings.m_sampleRate != settings.m_sampleRate) || force)
+    {
+        //reverseAPIKeys.append("sampleRate");
+        forwardChange = true;
+    }
+
+    if ((m_settings.m_volume != settings.m_volume) || force)
+    {
+        //reverseAPIKeys.append("volume");
+        m_audioInput.setVolume(settings.m_volume);
+        qDebug() << "AudioInput::applySettings: set volume to " << settings.m_volume;
+    }
+
+    if ((m_settings.m_log2Decim != settings.m_log2Decim) || force)
+    {
+        reverseAPIKeys.append("log2Decim");
+        forwardChange = true;
+
+        if (m_thread)
+        {
+            m_thread->setLog2Decimation(settings.m_log2Decim);
+            qDebug() << "AudioInput::applySettings: set decimation to " << (1<<settings.m_log2Decim);
+        }
+    }
+
+    if ((m_settings.m_iqMapping != settings.m_iqMapping) || force)
+    {
+        //reverseAPIKeys.append("iqMapping");
+        if (m_thread)
+            m_thread->setIQMapping(settings.m_iqMapping);
+    }
+
+    if (settings.m_useReverseAPI)
+    {
+        bool fullUpdate = ((m_settings.m_useReverseAPI != settings.m_useReverseAPI) && settings.m_useReverseAPI) ||
+                (m_settings.m_reverseAPIAddress != settings.m_reverseAPIAddress) ||
+                (m_settings.m_reverseAPIPort != settings.m_reverseAPIPort) ||
+                (m_settings.m_reverseAPIDeviceIndex != settings.m_reverseAPIDeviceIndex);
+        webapiReverseSendSettings(reverseAPIKeys, settings, fullUpdate || force);
+    }
+
+    m_settings = settings;
+
+    if (forwardChange)
+    {
+        DSPSignalNotification *notif = new DSPSignalNotification(m_settings.m_sampleRate/(1<<m_settings.m_log2Decim), 0);
+        m_deviceAPI->getDeviceEngineInputMessageQueue()->push(notif);
+    }
+}
+
+int AudioInput::webapiRunGet(
+        SWGSDRangel::SWGDeviceState& response,
+        QString& errorMessage)
+{
+    (void) errorMessage;
+    m_deviceAPI->getDeviceEngineStateStr(*response.getState());
+    return 200;
+}
+
+int AudioInput::webapiRun(
+        bool run,
+        SWGSDRangel::SWGDeviceState& response,
+        QString& errorMessage)
+{
+    (void) errorMessage;
+    m_deviceAPI->getDeviceEngineStateStr(*response.getState());
+    MsgStartStop *message = MsgStartStop::create(run);
+    m_inputMessageQueue.push(message);
+
+    if (m_guiMessageQueue) // forward to GUI if any
+    {
+        MsgStartStop *msgToGUI = MsgStartStop::create(run);
+        m_guiMessageQueue->push(msgToGUI);
+    }
+
+    return 200;
+}
+
+int AudioInput::webapiSettingsGet(
+                SWGSDRangel::SWGDeviceSettings& response,
+                QString& errorMessage)
+{
+    (void) errorMessage;
+    response.setAudioInputSettings(new SWGSDRangel::SWGAudioInputSettings());
+    response.getAudioInputSettings()->init();
+    webapiFormatDeviceSettings(response, m_settings);
+
+    return 200;
+}
+
+int AudioInput::webapiSettingsPutPatch(
+                bool force,
+                const QStringList& deviceSettingsKeys,
+                SWGSDRangel::SWGDeviceSettings& response, // query + response
+                QString& errorMessage)
+{
+    (void) errorMessage;
+    AudioInputSettings settings = m_settings;
+    webapiUpdateDeviceSettings(settings, deviceSettingsKeys, response);
+
+    MsgConfigureAudioInput *msg = MsgConfigureAudioInput::create(settings, force);
+    m_inputMessageQueue.push(msg);
+
+    if (m_guiMessageQueue) // forward to GUI if any
+    {
+        MsgConfigureAudioInput *msgToGUI = MsgConfigureAudioInput::create(settings, force);
+        m_guiMessageQueue->push(msgToGUI);
+    }
+
+    webapiFormatDeviceSettings(response, settings);
+    return 200;
+}
+
+void AudioInput::webapiUpdateDeviceSettings(
+        AudioInputSettings& settings,
+        const QStringList& deviceSettingsKeys,
+        SWGSDRangel::SWGDeviceSettings& response)
+{
+    if (deviceSettingsKeys.contains("device")) {
+        settings.m_deviceName = *response.getAudioInputSettings()->getDevice();
+    }
+    if (deviceSettingsKeys.contains("devSampleRate")) {
+        settings.m_sampleRate = response.getAudioInputSettings()->getDevSampleRate();
+    }
+    if (deviceSettingsKeys.contains("volume")) {
+        settings.m_volume = response.getAudioInputSettings()->getVolume();
+    }
+    if (deviceSettingsKeys.contains("log2Decim")) {
+        settings.m_log2Decim = response.getAudioInputSettings()->getLog2Decim();
+    }
+    if (deviceSettingsKeys.contains("iqMapping")) {
+        settings.m_iqMapping = (AudioInputSettings::IQMapping)response.getAudioInputSettings()->getIqMapping();
+    }
+    if (deviceSettingsKeys.contains("useReverseAPI")) {
+        settings.m_useReverseAPI = response.getAudioInputSettings()->getUseReverseApi() != 0;
+    }
+    if (deviceSettingsKeys.contains("reverseAPIAddress")) {
+        settings.m_reverseAPIAddress = *response.getAudioInputSettings()->getReverseApiAddress();
+    }
+    if (deviceSettingsKeys.contains("reverseAPIPort")) {
+        settings.m_reverseAPIPort = response.getAudioInputSettings()->getReverseApiPort();
+    }
+    if (deviceSettingsKeys.contains("reverseAPIDeviceIndex")) {
+        settings.m_reverseAPIDeviceIndex = response.getAudioInputSettings()->getReverseApiDeviceIndex();
+    }
+}
+
+void AudioInput::webapiFormatDeviceSettings(SWGSDRangel::SWGDeviceSettings& response, const AudioInputSettings& settings)
+{
+    response.getAudioInputSettings()->setDevice(new QString(settings.m_deviceName));
+    response.getAudioInputSettings()->setDevSampleRate(settings.m_sampleRate);
+    response.getAudioInputSettings()->setVolume(settings.m_volume);
+    response.getAudioInputSettings()->setLog2Decim(settings.m_log2Decim);
+    response.getAudioInputSettings()->setIqMapping((int)settings.m_iqMapping);
+
+    response.getAudioInputSettings()->setUseReverseApi(settings.m_useReverseAPI ? 1 : 0);
+
+    if (response.getAudioInputSettings()->getReverseApiAddress()) {
+        *response.getAudioInputSettings()->getReverseApiAddress() = settings.m_reverseAPIAddress;
+    } else {
+        response.getAudioInputSettings()->setReverseApiAddress(new QString(settings.m_reverseAPIAddress));
+    }
+
+    response.getAudioInputSettings()->setReverseApiPort(settings.m_reverseAPIPort);
+    response.getAudioInputSettings()->setReverseApiDeviceIndex(settings.m_reverseAPIDeviceIndex);
+}
+
+void AudioInput::webapiReverseSendSettings(QList<QString>& deviceSettingsKeys, const AudioInputSettings& settings, bool force)
+{
+    SWGSDRangel::SWGDeviceSettings *swgDeviceSettings = new SWGSDRangel::SWGDeviceSettings();
+    swgDeviceSettings->setDirection(0); // single Rx
+    swgDeviceSettings->setOriginatorIndex(m_deviceAPI->getDeviceSetIndex());
+    swgDeviceSettings->setDeviceHwType(new QString("AudioInput"));
+    swgDeviceSettings->setAudioInputSettings(new SWGSDRangel::SWGAudioInputSettings());
+    SWGSDRangel::SWGAudioInputSettings *swgAudioInputSettings = swgDeviceSettings->getAudioInputSettings();
+
+    // transfer data that has been modified. When force is on transfer all data except reverse API data
+
+    if (deviceSettingsKeys.contains("device") || force) {
+        swgAudioInputSettings->setDevice(new QString(settings.m_deviceName));
+    }
+    if (deviceSettingsKeys.contains("devSampleRate") || force) {
+        swgAudioInputSettings->setDevSampleRate(settings.m_sampleRate);
+    }
+    if (deviceSettingsKeys.contains("volume") || force) {
+        swgAudioInputSettings->setVolume(settings.m_volume);
+    }
+    if (deviceSettingsKeys.contains("log2Decim") || force) {
+        swgAudioInputSettings->setLog2Decim(settings.m_log2Decim);
+    }
+    if (deviceSettingsKeys.contains("iqMapping") || force) {
+        swgAudioInputSettings->setIqMapping(settings.m_iqMapping);
+    }
+
+    QString deviceSettingsURL = QString("http://%1:%2/sdrangel/deviceset/%3/device/settings")
+            .arg(settings.m_reverseAPIAddress)
+            .arg(settings.m_reverseAPIPort)
+            .arg(settings.m_reverseAPIDeviceIndex);
+    m_networkRequest.setUrl(QUrl(deviceSettingsURL));
+    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
+
+    QBuffer *buffer = new QBuffer();
+    buffer->open((QBuffer::ReadWrite));
+    buffer->write(swgDeviceSettings->asJson().toUtf8());
+    buffer->seek(0);
+
+    // Always use PATCH to avoid passing reverse API settings
+    QNetworkReply *reply = m_networkManager->sendCustomRequest(m_networkRequest, "PATCH", buffer);
+    buffer->setParent(reply);
+
+    delete swgDeviceSettings;
+}
+
+void AudioInput::webapiReverseSendStartStop(bool start)
+{
+    SWGSDRangel::SWGDeviceSettings *swgDeviceSettings = new SWGSDRangel::SWGDeviceSettings();
+    swgDeviceSettings->setDirection(0); // single Rx
+    swgDeviceSettings->setOriginatorIndex(m_deviceAPI->getDeviceSetIndex());
+    swgDeviceSettings->setDeviceHwType(new QString("AudioInput"));
+
+    QString deviceSettingsURL = QString("http://%1:%2/sdrangel/deviceset/%3/device/run")
+            .arg(m_settings.m_reverseAPIAddress)
+            .arg(m_settings.m_reverseAPIPort)
+            .arg(m_settings.m_reverseAPIDeviceIndex);
+    m_networkRequest.setUrl(QUrl(deviceSettingsURL));
+    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
+
+    QBuffer *buffer = new QBuffer();
+    buffer->open((QBuffer::ReadWrite));
+    buffer->write(swgDeviceSettings->asJson().toUtf8());
+    buffer->seek(0);
+    QNetworkReply *reply;
+
+    if (start) {
+        reply = m_networkManager->sendCustomRequest(m_networkRequest, "POST", buffer);
+    } else {
+        reply = m_networkManager->sendCustomRequest(m_networkRequest, "DELETE", buffer);
+    }
+
+    buffer->setParent(reply);
+    delete swgDeviceSettings;
+}
+
+void AudioInput::networkManagerFinished(QNetworkReply *reply)
+{
+    QNetworkReply::NetworkError replyError = reply->error();
+
+    if (replyError)
+    {
+        qWarning() << "AudioInput::networkManagerFinished:"
+                << " error(" << (int) replyError
+                << "): " << replyError
+                << ": " << reply->errorString();
+    }
+    else
+    {
+        QString answer = reply->readAll();
+        answer.chop(1); // remove last \n
+        qDebug("AudioInput::networkManagerFinished: reply:\n%s", answer.toStdString().c_str());
+    }
+
+    reply->deleteLater();
+}
+
+}

plugins/samplesource/audioinput/audioinput.h

@@ -0,0 +1,161 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015-2018 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/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDE_AUDIOINPUT_H
+#define INCLUDE_AUDIOINPUT_H
+
+#include <inttypes.h>
+
+#include <QString>
+#include <QByteArray>
+#include <QNetworkRequest>
+
+#include "dsp/devicesamplesource.h"
+#include "audio/audioinput.h"
+#include "audio/audiofifo.h"
+
+#include "audioinputsettings.h"
+
+class QNetworkAccessManager;
+class QNetworkReply;
+class DeviceAPI;
+class AudioInputThread;
+
+// AudioInput is used in sdrbase/audio/audioinput.h
+namespace AudioInputSource {
+
+class AudioInput : public DeviceSampleSource {
+    Q_OBJECT
+public:
+    class MsgConfigureAudioInput : public Message {
+        MESSAGE_CLASS_DECLARATION
+
+    public:
+        const AudioInputSettings& getSettings() const { return m_settings; }
+        bool getForce() const { return m_force; }
+
+        static MsgConfigureAudioInput* create(const AudioInputSettings& settings, bool force)
+        {
+            return new MsgConfigureAudioInput(settings, force);
+        }
+
+    private:
+        AudioInputSettings m_settings;
+        bool m_force;
+
+        MsgConfigureAudioInput(const AudioInputSettings& settings, bool force) :
+            Message(),
+            m_settings(settings),
+            m_force(force)
+        { }
+    };
+
+    class MsgStartStop : public Message {
+        MESSAGE_CLASS_DECLARATION
+
+    public:
+        bool getStartStop() const { return m_startStop; }
+
+        static MsgStartStop* create(bool startStop) {
+            return new MsgStartStop(startStop);
+        }
+
+    protected:
+        bool m_startStop;
+
+        MsgStartStop(bool startStop) :
+            Message(),
+            m_startStop(startStop)
+        { }
+    };
+
+    AudioInput(DeviceAPI *deviceAPI);
+    virtual ~AudioInput();
+    virtual void destroy();
+
+    virtual void init();
+    virtual bool start();
+    virtual void stop();
+
+    virtual QByteArray serialize() const;
+    virtual bool deserialize(const QByteArray& data);
+
+    virtual void setMessageQueueToGUI(MessageQueue *queue) { m_guiMessageQueue = queue; }
+    virtual const QString& getDeviceDescription() const;
+    virtual int getSampleRate() const;
+    virtual void setSampleRate(int sampleRate) { (void) sampleRate; }
+    virtual quint64 getCenterFrequency() const;
+    virtual void setCenterFrequency(qint64 centerFrequency);
+
+    virtual bool handleMessage(const Message& message);
+
+    virtual int webapiSettingsGet(
+                SWGSDRangel::SWGDeviceSettings& response,
+                QString& errorMessage);
+
+    virtual int webapiSettingsPutPatch(
+                bool force,
+                const QStringList& deviceSettingsKeys,
+                SWGSDRangel::SWGDeviceSettings& response, // query + response
+                QString& errorMessage);
+
+    virtual int webapiRunGet(
+            SWGSDRangel::SWGDeviceState& response,
+            QString& errorMessage);
+
+    virtual int webapiRun(
+            bool run,
+            SWGSDRangel::SWGDeviceState& response,
+            QString& errorMessage);
+
+    static void webapiFormatDeviceSettings(
+            SWGSDRangel::SWGDeviceSettings& response,
+            const AudioInputSettings& settings);
+
+    static void webapiUpdateDeviceSettings(
+            AudioInputSettings& settings,
+            const QStringList& deviceSettingsKeys,
+            SWGSDRangel::SWGDeviceSettings& response);
+
+private:
+    DeviceAPI *m_deviceAPI;
+    ::AudioInput m_audioInput;
+    AudioFifo m_fifo;
+    QMutex m_mutex;
+    AudioInputSettings m_settings;
+    AudioInputThread* m_thread;
+    QString m_deviceDescription;
+    bool m_running;
+    QNetworkAccessManager *m_networkManager;
+    QNetworkRequest m_networkRequest;
+
+    bool openDevice();
+    void closeDevice();
+    bool openAudioDevice(QString deviceName, int sampleRate);
+    void applySettings(const AudioInputSettings& settings, bool force);
+
+    void webapiReverseSendSettings(QList<QString>& deviceSettingsKeys, const AudioInputSettings& settings, bool force);
+    void webapiReverseSendStartStop(bool start);
+
+private slots:
+    void networkManagerFinished(QNetworkReply *reply);
+};
+
+}
+
+#endif // INCLUDE_AUDIOINPUT_H

plugins/samplesource/audioinput/audioinputgui.cpp

@@ -0,0 +1,304 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015 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 <QMessageBox>
+#include <QFileDialog>
+
+#include "ui_audioinputgui.h"
+#include "gui/colormapper.h"
+#include "gui/glspectrum.h"
+#include "gui/crightclickenabler.h"
+#include "gui/basicdevicesettingsdialog.h"
+#include "dsp/dspengine.h"
+#include "dsp/dspcommands.h"
+#include "audioinputgui.h"
+
+#include "device/deviceapi.h"
+#include "device/deviceuiset.h"
+
+AudioInputGui::AudioInputGui(DeviceUISet *deviceUISet, QWidget* parent) :
+    DeviceGUI(parent),
+    ui(new Ui::AudioInputGui),
+    m_deviceUISet(deviceUISet),
+    m_forceSettings(true),
+    m_settings(),
+    m_sampleSource(NULL)
+{
+    m_sampleSource = (AudioInputSource::AudioInput*) m_deviceUISet->m_deviceAPI->getSampleSource();
+
+    ui->setupUi(this);
+
+    connect(&m_updateTimer, SIGNAL(timeout()), this, SLOT(updateHardware()));
+
+    CRightClickEnabler *startStopRightClickEnabler = new CRightClickEnabler(ui->startStop);
+    connect(startStopRightClickEnabler, SIGNAL(rightClick(const QPoint &)), this, SLOT(openDeviceSettingsDialog(const QPoint &)));
+
+    displaySettings();
+
+    connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()), Qt::QueuedConnection);
+    m_sampleSource->setMessageQueueToGUI(&m_inputMessageQueue);
+}
+
+AudioInputGui::~AudioInputGui()
+{
+    delete ui;
+}
+
+void AudioInputGui::destroy()
+{
+    delete this;
+}
+
+void AudioInputGui::resetToDefaults()
+{
+    m_settings.resetToDefaults();
+    displaySettings();
+    sendSettings();
+}
+
+QByteArray AudioInputGui::serialize() const
+{
+    return m_settings.serialize();
+}
+
+bool AudioInputGui::deserialize(const QByteArray& data)
+{
+    if(m_settings.deserialize(data))
+    {
+        displaySettings();
+        m_forceSettings = true;
+        sendSettings();
+        return true;
+    }
+    else
+    {
+        resetToDefaults();
+        return false;
+    }
+}
+
+bool AudioInputGui::handleMessage(const Message& message)
+{
+    if (AudioInputSource::AudioInput::MsgConfigureAudioInput::match(message))
+    {
+        const AudioInputSource::AudioInput::MsgConfigureAudioInput& cfg = (AudioInputSource::AudioInput::MsgConfigureAudioInput&) message;
+        m_settings = cfg.getSettings();
+        blockApplySettings(true);
+        displaySettings();
+        blockApplySettings(false);
+        return true;
+    }
+    else if (AudioInputSource::AudioInput::MsgStartStop::match(message))
+    {
+        AudioInputSource::AudioInput::MsgStartStop& notif = (AudioInputSource::AudioInput::MsgStartStop&) message;
+        blockApplySettings(true);
+        ui->startStop->setChecked(notif.getStartStop());
+        blockApplySettings(false);
+
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+void AudioInputGui::handleInputMessages()
+{
+    Message* message;
+
+    while ((message = m_inputMessageQueue.pop()) != 0)
+    {
+        qDebug("AudioInputGui::handleInputMessages: message: %s", message->getIdentifier());
+
+        if (DSPSignalNotification::match(*message))
+        {
+            DSPSignalNotification* notif = (DSPSignalNotification*) message;
+            m_sampleRate = notif->getSampleRate();
+            qDebug("AudioInputGui::handleInputMessages: DSPSignalNotification: SampleRate: %d", notif->getSampleRate());
+            updateSampleRateAndFrequency();
+
+            delete message;
+        }
+        else
+        {
+            if (handleMessage(*message))
+            {
+                delete message;
+            }
+        }
+    }
+}
+
+void AudioInputGui::updateSampleRateAndFrequency()
+{
+/*
+    // Can't seem to get main spectrum to only display real part for mono/I-channel only
+    if (m_settings.m_iqMapping <= AudioInputSettings::IQMapping::R)
+    {
+        m_deviceUISet->getSpectrum()->setSampleRate(m_sampleRate / 2);
+        m_deviceUISet->getSpectrum()->setCenterFrequency(m_sampleRate / 4);
+        m_deviceUISet->getSpectrum()->setSsbSpectrum(true);
+        m_deviceUISet->getSpectrum()->setLsbDisplay(false);
+    }
+    else
+*/
+    {
+        m_deviceUISet->getSpectrum()->setSampleRate(m_sampleRate);
+        m_deviceUISet->getSpectrum()->setCenterFrequency(0);
+        m_deviceUISet->getSpectrum()->setSsbSpectrum(false);
+        m_deviceUISet->getSpectrum()->setLsbDisplay(false);
+    }
+    ui->deviceRateText->setText(tr("%1k").arg((float)m_sampleRate / 1000));
+}
+
+void AudioInputGui::refreshDeviceList()
+{
+    ui->device->blockSignals(true);
+    AudioDeviceManager *audioDeviceManager = DSPEngine::instance()->getAudioDeviceManager();
+    const QList<QAudioDeviceInfo>& audioList = audioDeviceManager->getInputDevices();
+
+    ui->device->clear();
+    for (const auto &itAudio : audioList)
+    {
+        ui->device->addItem(AudioInputSettings::getFullDeviceName(itAudio));
+    }
+    ui->device->blockSignals(false);
+}
+
+void AudioInputGui::refreshSampleRates(QString deviceName)
+{
+    ui->sampleRate->blockSignals(true);
+    ui->sampleRate->clear();
+    const auto deviceInfos = QAudioDeviceInfo::availableDevices(QAudio::AudioInput);
+    for (const QAudioDeviceInfo &deviceInfo : deviceInfos)
+    {
+        if (deviceName == AudioInputSettings::getFullDeviceName(deviceInfo))
+        {
+            QList<int> sampleRates = deviceInfo.supportedSampleRates();
+            for(int i = 0; i < sampleRates.size(); ++i)
+            {
+                ui->sampleRate->addItem(QString("%1").arg(sampleRates[i]));
+            }
+        }
+    }
+    ui->sampleRate->blockSignals(false);
+
+    int index = ui->sampleRate->findText(QString("%1").arg(m_settings.m_sampleRate));
+    if (index >= 0)
+        ui->sampleRate->setCurrentIndex(index);
+    else
+        ui->sampleRate->setCurrentIndex(0);
+}
+
+void AudioInputGui::displaySettings()
+{
+    refreshDeviceList();
+    int index = ui->device->findText(m_settings.m_deviceName);
+    if (index >= 0)
+        ui->device->setCurrentIndex(index);
+    else
+        ui->device->setCurrentIndex(0);
+    ui->decim->setCurrentIndex(m_settings.m_log2Decim);
+    ui->volume->setValue((int)(m_settings.m_volume*10.0f));
+    ui->volumeText->setText(QString("%1").arg(m_settings.m_volume, 3, 'f', 1));
+    ui->channels->setCurrentIndex((int)m_settings.m_iqMapping);
+    refreshSampleRates(ui->device->currentText());
+}
+
+void AudioInputGui::on_device_currentIndexChanged(int index)
+{
+    m_settings.m_deviceName = ui->device->currentText();
+    refreshSampleRates(m_settings.m_deviceName);
+    sendSettings();
+}
+
+void AudioInputGui::on_sampleRate_currentIndexChanged(int index)
+{
+    m_settings.m_sampleRate = ui->sampleRate->currentText().toInt();
+    sendSettings();
+}
+
+void AudioInputGui::on_decim_currentIndexChanged(int index)
+{
+    if ((index < 0) || (index > 6)) {
+        return;
+    }
+
+    m_settings.m_log2Decim = index;
+    sendSettings();
+}
+
+void AudioInputGui::on_volume_valueChanged(int value)
+{
+    m_settings.m_volume = value/10.0f;
+    ui->volumeText->setText(QString("%1").arg(m_settings.m_volume, 3, 'f', 1));
+    sendSettings();
+}
+
+void AudioInputGui::on_channels_currentIndexChanged(int index)
+{
+    m_settings.m_iqMapping = (AudioInputSettings::IQMapping)index;
+    updateSampleRateAndFrequency();
+    sendSettings();
+}
+
+void AudioInputGui::on_startStop_toggled(bool checked)
+{
+    if (m_doApplySettings)
+    {
+        AudioInputSource::AudioInput::MsgStartStop *message = AudioInputSource::AudioInput::MsgStartStop::create(checked);
+        m_sampleSource->getInputMessageQueue()->push(message);
+    }
+}
+
+void AudioInputGui::sendSettings()
+{
+    if(!m_updateTimer.isActive())
+        m_updateTimer.start(100);
+}
+
+void AudioInputGui::updateHardware()
+{
+    if (m_doApplySettings)
+    {
+        AudioInputSource::AudioInput::MsgConfigureAudioInput* message = AudioInputSource::AudioInput::MsgConfigureAudioInput::create(m_settings, m_forceSettings);
+        m_sampleSource->getInputMessageQueue()->push(message);
+        m_forceSettings = false;
+        m_updateTimer.stop();
+    }
+}
+
+void AudioInputGui::openDeviceSettingsDialog(const QPoint& p)
+{
+    BasicDeviceSettingsDialog dialog(this);
+    dialog.setUseReverseAPI(m_settings.m_useReverseAPI);
+    dialog.setReverseAPIAddress(m_settings.m_reverseAPIAddress);
+    dialog.setReverseAPIPort(m_settings.m_reverseAPIPort);
+    dialog.setReverseAPIDeviceIndex(m_settings.m_reverseAPIDeviceIndex);
+
+    dialog.move(p);
+    dialog.exec();
+
+    m_settings.m_useReverseAPI = dialog.useReverseAPI();
+    m_settings.m_reverseAPIAddress = dialog.getReverseAPIAddress();
+    m_settings.m_reverseAPIPort = dialog.getReverseAPIPort();
+    m_settings.m_reverseAPIDeviceIndex = dialog.getReverseAPIDeviceIndex();
+
+    sendSettings();
+}

plugins/samplesource/audioinput/audioinputgui.h

@@ -0,0 +1,83 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015 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/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDE_AUDIOINPUTGUI_H
+#define INCLUDE_AUDIOINPUTGUI_H
+
+#include <device/devicegui.h>
+#include <QTimer>
+#include <QWidget>
+
+#include "util/messagequeue.h"
+
+#include "audioinput.h"
+
+class QWidget;
+class DeviceUISet;
+
+namespace Ui {
+    class AudioInputGui;
+}
+
+class AudioInputGui : public DeviceGUI {
+    Q_OBJECT
+
+public:
+    explicit AudioInputGui(DeviceUISet *deviceUISet, QWidget* parent = 0);
+    virtual ~AudioInputGui();
+    virtual void destroy();
+
+    void resetToDefaults();
+    QByteArray serialize() const;
+    bool deserialize(const QByteArray& data);
+    virtual MessageQueue *getInputMessageQueue() { return &m_inputMessageQueue; }
+
+private:
+    Ui::AudioInputGui* ui;
+
+    DeviceUISet* m_deviceUISet;
+    bool m_doApplySettings;
+    bool m_forceSettings;
+    AudioInputSettings m_settings;
+    QTimer m_updateTimer;
+    DeviceSampleSource* m_sampleSource;
+    int m_sampleRate;
+
+    MessageQueue m_inputMessageQueue;
+
+    void blockApplySettings(bool block) { m_doApplySettings = !block; }
+    void refreshDeviceList();
+    void refreshSampleRates(QString deviceName);
+    void displaySettings();
+    void sendSettings();
+    void updateSampleRateAndFrequency();
+    bool handleMessage(const Message& message);
+
+private slots:
+    void handleInputMessages();
+    void on_device_currentIndexChanged(int index);
+    void on_sampleRate_currentIndexChanged(int index);
+    void on_decim_currentIndexChanged(int index);
+    void on_volume_valueChanged(int value);
+    void on_channels_currentIndexChanged(int index);
+    void on_startStop_toggled(bool checked);
+    void updateHardware();
+    void openDeviceSettingsDialog(const QPoint& p);
+};
+
+#endif // INCLUDE_AUDIOINPUTGUI_H

plugins/samplesource/audioinput/audioinputgui.ui

@@ -0,0 +1,391 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>AudioInputGui</class>
+ <widget class="QWidget" name="AudioInputGui">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>320</width>
+    <height>350</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="minimumSize">
+   <size>
+    <width>320</width>
+    <height>350</height>
+   </size>
+  </property>
+  <property name="font">
+   <font>
+    <family>Liberation Sans</family>
+    <pointsize>9</pointsize>
+   </font>
+  </property>
+  <property name="windowTitle">
+   <string>FunCubeDongle</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="spacing">
+    <number>3</number>
+   </property>
+   <property name="leftMargin">
+    <number>2</number>
+   </property>
+   <property name="topMargin">
+    <number>2</number>
+   </property>
+   <property name="rightMargin">
+    <number>2</number>
+   </property>
+   <property name="bottomMargin">
+    <number>2</number>
+   </property>
+   <item>
+    <layout class="QHBoxLayout" name="layoutFrequency">
+     <property name="topMargin">
+      <number>4</number>
+     </property>
+     <item>
+      <layout class="QVBoxLayout" name="deviceUILayout">
+       <item>
+        <layout class="QHBoxLayout" name="deviceButtonsLayout">
+         <item>
+          <widget class="ButtonSwitch" name="startStop">
+           <property name="toolTip">
+            <string>start/stop acquisition</string>
+           </property>
+           <property name="text">
+            <string/>
+           </property>
+           <property name="icon">
+            <iconset resource="../../../sdrgui/resources/res.qrc">
+             <normaloff>:/play.png</normaloff>
+             <normalon>:/stop.png</normalon>:/play.png</iconset>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <layout class="QHBoxLayout" name="deviceRateLayout">
+         <item>
+          <widget class="QLabel" name="deviceRateText">
+           <property name="toolTip">
+            <string>Baseband I/Q sample rate kS/s</string>
+           </property>
+           <property name="text">
+            <string>00000k</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+      </layout>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>0</width>
+         <height>0</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="Line" name="line_4">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_4">
+     <item>
+      <widget class="QLabel" name="deviceLabel">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Minimum" vsizetype="Preferred">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="text">
+        <string>Device</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="device">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="minimumSize">
+        <size>
+         <width>220</width>
+         <height>0</height>
+        </size>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QToolButton" name="refreshDevices">
+       <property name="toolTip">
+        <string>Refresh list of audio devices</string>
+       </property>
+       <property name="text">
+        <string>...</string>
+       </property>
+       <property name="icon">
+        <iconset resource="../../../sdrgui/resources/res.qrc">
+         <normaloff>:/recycle.png</normaloff>:/recycle.png</iconset>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="Line" name="line">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <item>
+      <widget class="QLabel" name="sampleRateLabel">
+       <property name="text">
+        <string>SR</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="sampleRate">
+       <property name="minimumSize">
+        <size>
+         <width>100</width>
+         <height>0</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Audio sample rate in Hz</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="sampleRateUnits">
+       <property name="text">
+        <string> Hz</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_4">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QComboBox" name="decim">
+       <property name="maximumSize">
+        <size>
+         <width>50</width>
+         <height>16777215</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Decimation factor</string>
+       </property>
+       <item>
+        <property name="text">
+         <string>1</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>2</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>4</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>8</string>
+        </property>
+       </item>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="decimLabel">
+       <property name="text">
+        <string>Dec</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="Line" name="line_2">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLabel" name="volumeLabel">
+       <property name="text">
+        <string>Volume</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QDial" name="volume">
+       <property name="minimumSize">
+        <size>
+         <width>24</width>
+         <height>0</height>
+        </size>
+       </property>
+       <property name="maximumSize">
+        <size>
+         <width>24</width>
+         <height>24</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Audio volume. Not supported by all devices</string>
+       </property>
+       <property name="maximum">
+        <number>10</number>
+       </property>
+       <property name="value">
+        <number>10</number>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="volumeText">
+       <property name="text">
+        <string>1.0</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_3">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Channel Map</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="channels">
+       <property name="minimumSize">
+        <size>
+         <width>80</width>
+         <height>0</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>How audio channels map to IQ data</string>
+       </property>
+       <property name="currentIndex">
+        <number>0</number>
+       </property>
+       <item>
+        <property name="text">
+         <string>I=L, Q=0</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>I=R, Q=0</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>I=L, Q=R</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>I=R, Q=L</string>
+        </property>
+       </item>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="padLayout">
+     <item>
+      <spacer name="verticalPadSpacer">
+       <property name="orientation">
+        <enum>Qt::Vertical</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>20</width>
+         <height>40</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ButtonSwitch</class>
+   <extends>QToolButton</extends>
+   <header>gui/buttonswitch.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources>
+  <include location="../../../sdrgui/resources/res.qrc"/>
+ </resources>
+ <connections/>
+</ui>

plugins/samplesource/audioinput/audioinputplugin.cpp

@@ -0,0 +1,151 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015 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 <QtPlugin>
+#include "plugin/pluginapi.h"
+#include "util/simpleserializer.h"
+#include "audioinputplugin.h"
+#include "audioinputwebapiadapter.h"
+
+#ifdef SERVER_MODE
+#include "audioinput.h"
+#else
+#include "audioinputgui.h"
+#endif
+
+const PluginDescriptor AudioInputPlugin::m_pluginDescriptor = {
+    QString("AudioInput"),
+    QString("Audio Input"),
+    QString("4.22.0"),
+    QString("(c) Jon Beniston, M7RCE and Edouard Griffiths, F4EXB"),
+    QString("https://github.com/f4exb/sdrangel"),
+    true,
+    QString("https://github.com/f4exb/sdrangel")
+};
+
+const QString AudioInputPlugin::m_hardwareID = "AudioInput";
+const QString AudioInputPlugin::m_deviceTypeID = AUDIOINPUT_DEVICE_TYPE_ID;
+
+AudioInputPlugin::AudioInputPlugin(QObject* parent) :
+    QObject(parent)
+{
+}
+
+const PluginDescriptor& AudioInputPlugin::getPluginDescriptor() const
+{
+    return m_pluginDescriptor;
+}
+
+void AudioInputPlugin::initPlugin(PluginAPI* pluginAPI)
+{
+    pluginAPI->registerSampleSource(m_deviceTypeID, this);
+}
+
+void AudioInputPlugin::enumOriginDevices(QStringList& listedHwIds, OriginDevices& originDevices)
+{
+    if (listedHwIds.contains(m_hardwareID)) { // check if it was done
+        return;
+    }
+
+    // We could list all input audio devices here separately
+    // but I thought it makes it simpler to switch between inputs
+    // if they are in the AudioInput GUI
+    originDevices.append(OriginDevice(
+        "Audio",
+        m_hardwareID,
+        "0",
+        0,
+        1, // nb Rx
+        0  // nb Tx
+    ));
+}
+
+PluginInterface::SamplingDevices AudioInputPlugin::enumSampleSources(const OriginDevices& originDevices)
+{
+    SamplingDevices result;
+
+    for (OriginDevices::const_iterator it = originDevices.begin(); it != originDevices.end(); ++it)
+    {
+        if (it->hardwareId == m_hardwareID)
+        {
+            for (unsigned int j = 0; j < it->nbRxStreams; j++)
+            {
+                result.append(SamplingDevice(
+                    it->displayableName,
+                    it->hardwareId,
+                    m_deviceTypeID,
+                    it->serial,
+                    it->sequence,
+                    PluginInterface::SamplingDevice::PhysicalDevice,
+                    PluginInterface::SamplingDevice::StreamSingleRx,
+                    it->nbRxStreams,
+                    j));
+            }
+        }
+    }
+
+    return result;
+}
+
+#ifdef SERVER_MODE
+DeviceGUI* AudioInputPlugin::createSampleSourcePluginInstanceGUI(
+        const QString& sourceId,
+        QWidget **widget,
+        DeviceUISet *deviceUISet)
+{
+    (void) sourceId;
+    (void) widget;
+    (void) deviceUISet;
+    return 0;
+}
+#else
+DeviceGUI* AudioInputPlugin::createSampleSourcePluginInstanceGUI(
+        const QString& sourceId,
+        QWidget **widget,
+        DeviceUISet *deviceUISet)
+{
+    if(sourceId == m_deviceTypeID)
+    {
+        AudioInputGui* gui = new AudioInputGui(deviceUISet);
+        *widget = gui;
+        return gui;
+    }
+    else
+    {
+        return 0;
+    }
+}
+#endif
+
+DeviceSampleSource *AudioInputPlugin::createSampleSourcePluginInstance(const QString& sourceId, DeviceAPI *deviceAPI)
+{
+    if (sourceId == m_deviceTypeID)
+    {
+        AudioInputSource::AudioInput* input = new AudioInputSource::AudioInput(deviceAPI);
+        return input;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+DeviceWebAPIAdapter *AudioInputPlugin::createDeviceWebAPIAdapter() const
+{
+    return new AudioInputWebAPIAdapter();
+}

plugins/samplesource/audioinput/audioinputplugin.h

@@ -0,0 +1,56 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015 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/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDE_AUDIOINPUTPLUGIN_H
+#define INCLUDE_AUDIOINPUTPLUGIN_H
+
+#include <QObject>
+#include "plugin/plugininterface.h"
+
+#define AUDIOINPUT_DEVICE_TYPE_ID "sdrangel.samplesource.audioinput"
+
+class PluginAPI;
+
+class AudioInputPlugin : public QObject, public PluginInterface {
+    Q_OBJECT
+    Q_INTERFACES(PluginInterface)
+    Q_PLUGIN_METADATA(IID AUDIOINPUT_DEVICE_TYPE_ID)
+
+public:
+    explicit AudioInputPlugin(QObject* parent = NULL);
+
+    const PluginDescriptor& getPluginDescriptor() const;
+    void initPlugin(PluginAPI* pluginAPI);
+
+    virtual void enumOriginDevices(QStringList& listedHwIds, OriginDevices& originDevices);
+    virtual SamplingDevices enumSampleSources(const OriginDevices& originDevices);
+    virtual DeviceGUI* createSampleSourcePluginInstanceGUI(
+            const QString& sourceId,
+            QWidget **widget,
+            DeviceUISet *deviceUISet);
+    virtual DeviceSampleSource* createSampleSourcePluginInstance(const QString& sourceId, DeviceAPI *deviceAPI);
+    virtual DeviceWebAPIAdapter* createDeviceWebAPIAdapter() const;
+
+    static const QString m_hardwareID;
+    static const QString m_deviceTypeID;
+
+private:
+    static const PluginDescriptor m_pluginDescriptor;
+};
+
+#endif // INCLUDE_AUDIOINPUTPLUGIN_H

plugins/samplesource/audioinput/audioinputsettings.cpp

@@ -0,0 +1,99 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015 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 <QtGlobal>
+#include "util/simpleserializer.h"
+#include "audioinputsettings.h"
+
+AudioInputSettings::AudioInputSettings()
+{
+    resetToDefaults();
+}
+
+void AudioInputSettings::resetToDefaults()
+{
+    m_deviceName = "";
+    m_sampleRate = 48000;
+    m_volume = 1.0f;
+    m_log2Decim = 0;
+    m_iqMapping = L;
+    m_useReverseAPI = false;
+    m_reverseAPIAddress = "127.0.0.1";
+    m_reverseAPIPort = 8888;
+    m_reverseAPIDeviceIndex = 0;
+}
+
+QByteArray AudioInputSettings::serialize() const
+{
+    SimpleSerializer s(1);
+
+    s.writeString(1, m_deviceName);
+    s.writeS32(2, m_sampleRate);
+    s.writeFloat(3, m_volume);
+    s.writeU32(4, m_log2Decim);
+    s.writeS32(5, (int)m_iqMapping);
+
+    s.writeBool(24, m_useReverseAPI);
+    s.writeString(25, m_reverseAPIAddress);
+    s.writeU32(26, m_reverseAPIPort);
+    s.writeU32(27, m_reverseAPIDeviceIndex);
+
+    return s.final();
+}
+
+bool AudioInputSettings::deserialize(const QByteArray& data)
+{
+    SimpleDeserializer d(data);
+
+    if (!d.isValid())
+    {
+        resetToDefaults();
+        return false;
+    }
+
+    if (d.getVersion() == 1)
+    {
+        uint32_t uintval;
+
+        d.readString(1, &m_deviceName, "");
+        d.readS32(2, &m_sampleRate, 48000);
+        d.readFloat(3, &m_volume, 1.0f);
+        d.readU32(4, &m_log2Decim, 0);
+        d.readS32(5, (int *)&m_iqMapping, IQMapping::L);
+
+        d.readBool(24, &m_useReverseAPI, false);
+        d.readString(25, &m_reverseAPIAddress, "127.0.0.1");
+        d.readU32(26, &uintval, 0);
+
+        if ((uintval > 1023) && (uintval < 65535)) {
+            m_reverseAPIPort = uintval;
+        } else {
+            m_reverseAPIPort = 8888;
+        }
+
+        d.readU32(27, &uintval, 0);
+        m_reverseAPIDeviceIndex = uintval > 99 ? 99 : uintval;
+
+        return true;
+    }
+    else
+    {
+        resetToDefaults();
+        return false;
+    }
+}

plugins/samplesource/audioinput/audioinputsettings.h

@@ -0,0 +1,64 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015 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/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef _AUDIOINPUT_AUDIOINPUTSETTINGS_H_
+#define _AUDIOINPUT_AUDIOINPUTSETTINGS_H_
+
+#include <QString>
+#include <QAudioDeviceInfo>
+
+struct AudioInputSettings {
+
+    QString m_deviceName;       // Including realm, as from getFullDeviceName below
+    int m_sampleRate;
+    float m_volume;
+    quint32 m_log2Decim;
+    enum IQMapping {
+        L,
+        R,
+        LR,
+        RL
+    } m_iqMapping;
+
+    bool     m_useReverseAPI;
+    QString  m_reverseAPIAddress;
+    uint16_t m_reverseAPIPort;
+    uint16_t m_reverseAPIDeviceIndex;
+
+    AudioInputSettings();
+    void resetToDefaults();
+    QByteArray serialize() const;
+    bool deserialize(const QByteArray& data);
+
+    // Append realm to device names, because there may be multiple devices with the same name on Windows
+    static QString getFullDeviceName(const QAudioDeviceInfo &deviceInfo)
+    {
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+        return deviceInfo.deviceName();
+#else
+        QString realm = deviceInfo.realm();
+        if (realm != "" && realm != "default")
+            return deviceInfo.deviceName() + " " + realm;
+        else
+            return deviceInfo.deviceName();
+#endif
+    }
+
+};
+
+#endif /* _AUDIOINPUT_AUDIOINPUTSETTINGS_H_ */

plugins/samplesource/audioinput/audioinputthread.cpp

@@ -0,0 +1,141 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
+// written by Christian Daniel                                                   //
+// 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 <stdio.h>
+#include <errno.h>
+#include <chrono>
+#include <thread>
+
+#include "dsp/samplesinkfifo.h"
+#include "audio/audiofifo.h"
+
+#include "audioinputthread.h"
+
+AudioInputThread::AudioInputThread(SampleSinkFifo* sampleFifo, AudioFifo *fifo, QObject* parent) :
+    QThread(parent),
+    m_fifo(fifo),
+    m_running(false),
+    m_log2Decim(0),
+    m_iqMapping(AudioInputSettings::IQMapping::L),
+    m_convertBuffer(m_convBufSamples),
+    m_sampleFifo(sampleFifo)
+{
+    start();
+}
+
+AudioInputThread::~AudioInputThread()
+{
+}
+
+void AudioInputThread::startWork()
+{
+    m_startWaitMutex.lock();
+
+    start();
+
+    while(!m_running)
+    {
+        m_startWaiter.wait(&m_startWaitMutex, 100);
+    }
+
+    m_startWaitMutex.unlock();
+}
+
+void AudioInputThread::stopWork()
+{
+    m_running = false;
+    wait();
+}
+
+void AudioInputThread::run()
+{
+    m_running = true;
+    qDebug("AudioInputThread::run: start running loop");
+
+    while (m_running)
+    {
+        workIQ(m_convBufSamples);
+    }
+
+    qDebug("AudioInputThread::run: running loop stopped");
+    m_running = false;
+}
+
+void AudioInputThread::workIQ(unsigned int samples)
+{
+    // Most of the time, this returns 0, because of the low sample rate.
+    // Could be more efficient in this case to have blocking wait?
+    uint32_t nbRead = m_fifo->read((unsigned char *) m_buf, samples);
+
+    // Map between left and right audio channels and IQ channels
+    if (m_iqMapping == AudioInputSettings::IQMapping::L)
+    {
+        for (uint32_t i = 0; i < nbRead; i++)
+            m_buf[i*2+1] = 0;
+    }
+    else if (m_iqMapping == AudioInputSettings::IQMapping::R)
+    {
+        for (uint32_t i = 0; i < nbRead; i++)
+        {
+            m_buf[i*2] = m_buf[i*2+1];
+            m_buf[i*2+1] = 0;
+        }
+    }
+    else if (m_iqMapping == AudioInputSettings::IQMapping::LR)
+    {
+        for (uint32_t i = 0; i < nbRead; i++)
+        {
+            qint16 t = m_buf[i*2];
+            m_buf[i*2] = m_buf[i*2+1];
+            m_buf[i*2+1] = t;
+        }
+    }
+
+    SampleVector::iterator it = m_convertBuffer.begin();
+
+    switch (m_log2Decim)
+    {
+    case 0:
+        m_decimatorsIQ.decimate1(&it, m_buf, 2*nbRead);
+        break;
+    case 1:
+        m_decimatorsIQ.decimate2_cen(&it, m_buf, 2*nbRead);
+        break;
+    case 2:
+        m_decimatorsIQ.decimate4_cen(&it, m_buf, 2*nbRead);
+        break;
+    case 3:
+        m_decimatorsIQ.decimate8_cen(&it, m_buf, 2*nbRead);
+        break;
+    case 4:
+        m_decimatorsIQ.decimate16_cen(&it, m_buf, 2*nbRead);
+        break;
+    case 5:
+        m_decimatorsIQ.decimate32_cen(&it, m_buf, 2*nbRead);
+        break;
+    case 6:
+        m_decimatorsIQ.decimate64_cen(&it, m_buf, 2*nbRead);
+        break;
+    default:
+        break;
+    }
+
+    m_sampleFifo->write(m_convertBuffer.begin(), it);
+}

plugins/samplesource/audioinput/audioinputthread.h

@@ -0,0 +1,63 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015-2018 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/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDE_AUDIOINPUTTHREAD_H
+#define INCLUDE_AUDIOINPUTTHREAD_H
+
+#include <QThread>
+#include <QMutex>
+#include <QWaitCondition>
+
+#include "dsp/samplesinkfifo.h"
+#include "dsp/decimators.h"
+#include "audioinputsettings.h"
+
+class AudioFifo;
+
+class AudioInputThread : public QThread {
+    Q_OBJECT
+
+public:
+    AudioInputThread(SampleSinkFifo* sampleFifo, AudioFifo *fifo, QObject* parent = nullptr);
+    ~AudioInputThread();
+
+    void startWork();
+    void stopWork();
+    void setLog2Decimation(unsigned int log2_decim) {m_log2Decim = log2_decim;}
+    void setIQMapping(AudioInputSettings::IQMapping iqMapping) {m_iqMapping = iqMapping;}
+
+    static const int m_convBufSamples = 4096;
+private:
+    AudioFifo* m_fifo;
+
+    QMutex m_startWaitMutex;
+    QWaitCondition m_startWaiter;
+    bool m_running;
+    unsigned int m_log2Decim;
+    AudioInputSettings::IQMapping m_iqMapping;
+
+    qint16 m_buf[m_convBufSamples*2]; // stereo (I, Q)
+    SampleVector m_convertBuffer;
+    SampleSinkFifo* m_sampleFifo;
+    Decimators<qint32, qint16, SDR_RX_SAMP_SZ, 16, true> m_decimatorsIQ;
+
+    void run();
+    void workIQ(unsigned int samples);
+};
+
+#endif // INCLUDE_AUDIOINPUTTHREAD_H

plugins/samplesource/audioinput/audioinputwebapiadapter.cpp

@@ -0,0 +1,49 @@
+///////////////////////////////////////////////////////////////////////////////////
+// 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 "SWGDeviceSettings.h"
+#include "audioinput.h"
+#include "audioinputwebapiadapter.h"
+
+AudioInputWebAPIAdapter::AudioInputWebAPIAdapter()
+{}
+
+AudioInputWebAPIAdapter::~AudioInputWebAPIAdapter()
+{}
+
+int AudioInputWebAPIAdapter::webapiSettingsGet(
+        SWGSDRangel::SWGDeviceSettings& response,
+        QString& errorMessage)
+{
+    (void) errorMessage;
+    response.setAirspyHfSettings(new SWGSDRangel::SWGAirspyHFSettings());
+    response.getAirspyHfSettings()->init();
+    AudioInputSource::AudioInput::webapiFormatDeviceSettings(response, m_settings);
+    return 200;
+}
+
+int AudioInputWebAPIAdapter::webapiSettingsPutPatch(
+        bool force,
+        const QStringList& deviceSettingsKeys,
+        SWGSDRangel::SWGDeviceSettings& response, // query + response
+        QString& errorMessage)
+{
+    (void) errorMessage;
+    AudioInputSource::AudioInput::webapiUpdateDeviceSettings(m_settings, deviceSettingsKeys, response);
+    return 200;
+}

plugins/samplesource/audioinput/audioinputwebapiadapter.h

@@ -0,0 +1,42 @@
+///////////////////////////////////////////////////////////////////////////////////
+// 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 "device/devicewebapiadapter.h"
+#include "audioinputsettings.h"
+
+class AudioInputWebAPIAdapter : public DeviceWebAPIAdapter
+{
+public:
+    AudioInputWebAPIAdapter();
+    virtual ~AudioInputWebAPIAdapter();
+    virtual QByteArray serialize() { return m_settings.serialize(); }
+    virtual bool deserialize(const QByteArray& data) { return m_settings.deserialize(data); }
+
+    virtual int webapiSettingsGet(
+            SWGSDRangel::SWGDeviceSettings& response,
+            QString& errorMessage);
+
+    virtual int webapiSettingsPutPatch(
+            bool force,
+            const QStringList& deviceSettingsKeys,
+            SWGSDRangel::SWGDeviceSettings& response, // query + response
+            QString& errorMessage);
+
+private:
+    AudioInputSettings m_settings;
+};

plugins/samplesource/audioinput/readme.md

@@ -0,0 +1,46 @@
+<h1>Audio input plugin</h1>
+
+<h2>Introduction</h2>
+
+This input sample source plugin gets its samples from an audio device.
+
+<h2>Interface</h2>
+
+![Audio input plugin GUI](../../../doc/img/AudioInput_plugin.png)
+
+<h3>1: Start/Stop</h3>
+
+Device start / stop button.
+
+  - Blue triangle icon: device is ready and can be started
+  - Green square icon: device is running and can be stopped
+  - Magenta (or pink) square icon: an error occurred. In the case the device was accidentally disconnected you may click on the icon, plug back in and start again.
+
+<h3>2: Device</h3>
+
+The audio device to use.
+
+<h3>3: Refresh devices<h3>
+
+Refresh the list of audio devices.
+
+<h3>4: Audio sample rate</h3>
+
+Audio sample rate in Hz (Sa/s).
+
+<h3>5: Decimation</h3>
+
+A decimation factor to apply to the audio data. The baseband sample rate will be the audio sample, divided by this decimation factor.
+
+<h3>6: Volume</h3>
+
+A control to set the input volume. This is not supported by all input audio devices.
+
+<h3>7: Channel Map</h3>
+
+This controls how the left and right stereo audio channels map on to the IQ channels.
+
+* I=L, Q=0 - The left audio channel is driven to the I channel. The Q channel is set to 0.
+* I=R, Q=0 - The right audio channel is driven to the I channel. The Q channel is set to 0.
+* I=L, Q=R - The left audio channel is driven to the I channel. The right audio channel is driven to the Q channel.
+* I=R, Q=L - The right audio channel is driven to the I channel. The left audio channel is driven to the Q channel.