basebandsamplesource.h

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// Copyright (C) 2016 F4EXB                                                      //
// written by Edouard Griffiths                                                  //
//                                                                               //
// 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 SDRBASE_DSP_BASEBANDSAMPLESOURCE_H_
#define SDRBASE_DSP_BASEBANDSAMPLESOURCE_H_

#include <QObject>
#include "dsp/dsptypes.h"
#include "dsp/samplesourcefifo.h"
#include "export.h"
#include "util/messagequeue.h"

class Message;

class SDRBASE_API BasebandSampleSource : public QObject {
    Q_OBJECT
public:
    BasebandSampleSource();
    virtual ~BasebandSampleSource();

    virtual void start() = 0;
    virtual void stop() = 0;
    virtual void pull(Sample& sample) = 0;
    virtual void pullAudio(int nbSamples) { (void) nbSamples; }

    void feed(SampleSourceFifo* sampleFifo, int nbSamples)
    {
        SampleVector::iterator writeAt;
        sampleFifo->getWriteIterator(writeAt);
        pullAudio(nbSamples); // Pre-fetch input audio samples this is mandatory to keep things running smoothly

        for (int i = 0; i < nbSamples; i++)
        {
            pull((*writeAt));
            sampleFifo->bumpIndex(writeAt);
        }
    }

    SampleSourceFifo& getSampleSourceFifo() { return m_sampleFifo; }

    virtual bool handleMessage(const Message& cmd) = 0; 

    MessageQueue *getInputMessageQueue() { return &m_inputMessageQueue; } 
    virtual void setMessageQueueToGUI(MessageQueue *queue) { m_guiMessageQueue = queue; }
    MessageQueue *getMessageQueueToGUI() { return m_guiMessageQueue; }
    void setDeviceSampleSourceFifo(SampleSourceFifo *deviceSampleFifo);

protected:
    MessageQueue m_inputMessageQueue;     
    MessageQueue *m_guiMessageQueue;      
    SampleSourceFifo m_sampleFifo;        
    SampleSourceFifo *m_deviceSampleFifo; 

    void handleWriteToFifo(SampleSourceFifo *sampleFifo, int nbSamples);

protected slots:
    void handleInputMessages();
    void handleWriteToFifo(int nbSamples);
    void handleWriteToDeviceFifo(int nbSamples);
};

#endif /* SDRBASE_DSP_BASEBANDSAMPLESOURCE_H_ */