airspyhfthread.cpp

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// Copyright (C) 2018 Edouard Griffiths, F4EXB                                   //
//                                                                               //
// 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 <stdio.h>
#include <errno.h>

#include "dsp/samplesinkfifo.h"
#include "airspyhfthread.h"

AirspyHFThread *AirspyHFThread::m_this = 0;

AirspyHFThread::AirspyHFThread(airspyhf_device_t* dev, SampleSinkFifo* sampleFifo, QObject* parent) :
    QThread(parent),
    m_running(false),
    m_dev(dev),
    m_convertBuffer(AIRSPYHF_BLOCKSIZE),
    m_sampleFifo(sampleFifo),
    m_samplerate(10),
    m_log2Decim(0)
{
    memset((char*) m_buf, 0, 2*AIRSPYHF_BLOCKSIZE*sizeof(qint16));
    m_this = this;
}

AirspyHFThread::~AirspyHFThread()
{
    stopWork();
    m_this = 0;
}

void AirspyHFThread::startWork()
{
    m_startWaitMutex.lock();
    start();
    while(!m_running)
        m_startWaiter.wait(&m_startWaitMutex, 100);
    m_startWaitMutex.unlock();
}

void AirspyHFThread::stopWork()
{
    qDebug("AirspyThread::stopWork");
    m_running = false;
    wait();
}

void AirspyHFThread::setSamplerate(uint32_t samplerate)
{
    m_samplerate = samplerate;
}

void AirspyHFThread::setLog2Decimation(unsigned int log2_decim)
{
    m_log2Decim = log2_decim;
}

void AirspyHFThread::run()
{
    airspyhf_error rc;

    m_running = true;
    m_startWaiter.wakeAll();

    rc = (airspyhf_error) airspyhf_start(m_dev, rx_callback, 0);

    if (rc != AIRSPYHF_SUCCESS)
    {
        qCritical("AirspyHFFThread::run: failed to start Airspy HF Rx");
    }
    else
    {
        while ((m_running) && (airspyhf_is_streaming(m_dev) != 0))
        {
            sleep(1);
        }
    }

    rc = (airspyhf_error) airspyhf_stop(m_dev);

    if (rc == AIRSPYHF_SUCCESS) {
        qDebug("AirspyHFFThread::run: stopped Airspy HF Rx");
    } else {
        qDebug("AirspyHFFThread::run: failed to stop Airspy HF Rx");
    }

    m_running = false;
}

//  Decimate according to specified log2 (ex: log2=4 => decim=16)
void AirspyHFThread::callback(const float* buf, qint32 len)
{
    SampleVector::iterator it = m_convertBuffer.begin();

    switch (m_log2Decim)
    {
    case 0:
        m_decimators.decimate1(&it, buf, len);
        break;
    case 1:
        m_decimators.decimate2_cen(&it, buf, len);
        break;
    case 2:
        m_decimators.decimate4_cen(&it, buf, len);
        break;
    case 3:
        m_decimators.decimate8_cen(&it, buf, len);
        break;
    case 4:
        m_decimators.decimate16_cen(&it, buf, len);
        break;
    case 5:
        m_decimators.decimate32_cen(&it, buf, len);
        break;
    case 6:
        m_decimators.decimate64_cen(&it, buf, len);
        break;
    default:
        break;
    }

    m_sampleFifo->write(m_convertBuffer.begin(), it);
}


int AirspyHFThread::rx_callback(airspyhf_transfer_t* transfer)
{
    qint32 nbIAndQ = transfer->sample_count * 2;
    m_this->callback((float *) transfer->samples, nbIAndQ);
    return 0;
}