airspythread.cpp

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// Copyright (C) 2015 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 <algorithm>

#include "airspythread.h"

#include "dsp/samplesinkfifo.h"

AirspyThread *AirspyThread::m_this = 0;

AirspyThread::AirspyThread(struct airspy_device* dev, SampleSinkFifo* sampleFifo, QObject* parent) :
    QThread(parent),
    m_running(false),
    m_dev(dev),
    m_convertBuffer(AIRSPY_BLOCKSIZE),
    m_sampleFifo(sampleFifo),
    m_samplerate(10),
    m_log2Decim(0),
    m_fcPos(0)
{
    m_this = this;
    std::fill(m_buf, m_buf + 2*AIRSPY_BLOCKSIZE, 0);
}

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

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

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

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

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

void AirspyThread::setFcPos(int fcPos)
{
    m_fcPos = fcPos;
}

void AirspyThread::run()
{
    airspy_error rc;

    m_running = true;
    m_startWaiter.wakeAll();

    rc = (airspy_error) airspy_start_rx(m_dev, rx_callback, NULL);

    if (rc != AIRSPY_SUCCESS)
    {
        qCritical("AirspyThread::run: failed to start Airspy Rx: %s", airspy_error_name(rc));
    }
    else
    {
        while ((m_running) && (airspy_is_streaming(m_dev) == AIRSPY_TRUE))
        {
            sleep(1);
        }
    }

    rc = (airspy_error) airspy_stop_rx(m_dev);

    if (rc == AIRSPY_SUCCESS)
    {
        qDebug("AirspyThread::run: stopped Airspy Rx");
    }
    else
    {
        qDebug("AirspyThread::run: failed to stop Airspy Rx: %s", airspy_error_name(rc));
    }

    m_running = false;
}

//  Decimate according to specified log2 (ex: log2=4 => decim=16)
void AirspyThread::callback(const qint16* buf, qint32 len)
{
    SampleVector::iterator it = m_convertBuffer.begin();

    if (m_log2Decim == 0)
    {
        m_decimators.decimate1(&it, buf, len);
    }
    else
    {
        if (m_fcPos == 0) // Infra
        {
            switch (m_log2Decim)
            {
            case 1:
                m_decimators.decimate2_inf(&it, buf, len);
                break;
            case 2:
                m_decimators.decimate4_inf(&it, buf, len);
                break;
            case 3:
                m_decimators.decimate8_inf(&it, buf, len);
                break;
            case 4:
                m_decimators.decimate16_inf(&it, buf, len);
                break;
            case 5:
                m_decimators.decimate32_inf(&it, buf, len);
                break;
            case 6:
                m_decimators.decimate64_inf(&it, buf, len);
                break;
            default:
                break;
            }
        }
        else if (m_fcPos == 1) // Supra
        {
            switch (m_log2Decim)
            {
            case 1:
                m_decimators.decimate2_sup(&it, buf, len);
                break;
            case 2:
                m_decimators.decimate4_sup(&it, buf, len);
                break;
            case 3:
                m_decimators.decimate8_sup(&it, buf, len);
                break;
            case 4:
                m_decimators.decimate16_sup(&it, buf, len);
                break;
            case 5:
                m_decimators.decimate32_sup(&it, buf, len);
                break;
            case 6:
                m_decimators.decimate64_sup(&it, buf, len);
                break;
            default:
                break;
            }
        }
        else if (m_fcPos == 2) // Center
        {
            switch (m_log2Decim)
            {
            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 AirspyThread::rx_callback(airspy_transfer_t* transfer)
{
    qint32 bytes_to_write = transfer->sample_count * sizeof(qint16);
    m_this->callback((qint16 *) transfer->samples, bytes_to_write);
    return 0;
}