sdrplaythread.cpp

Go to the documentation of this file.

// Copyright (C) 2016 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 "sdrplaythread.h"
#include "dsp/samplesinkfifo.h"

SDRPlayThread::SDRPlayThread(mirisdr_dev_t* dev, SampleSinkFifo* sampleFifo, QObject* parent) :
    QThread(parent),
    m_running(false),
    m_dev(dev),
    m_convertBuffer(SDRPLAY_INIT_NBSAMPLES),
    m_sampleFifo(sampleFifo),
    m_samplerate(288000),
    m_log2Decim(0),
    m_fcPos(0)
{
}

SDRPlayThread::~SDRPlayThread()
{
    stopWork();
}

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

void SDRPlayThread::stopWork()
{
    m_running = false;
    wait();
}

void SDRPlayThread::setSamplerate(int samplerate)
{
    m_samplerate = samplerate;
}

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

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

void SDRPlayThread::run()
{
    int res;

    m_running = true;
    m_startWaiter.wakeAll();

    while (m_running)
    {
        if ((res = mirisdr_read_async(m_dev, &SDRPlayThread::callbackHelper, this, 32, SDRPLAY_INIT_NBSAMPLES)) < 0)
        {
            qCritical("SDRPlayThread::run: async read error: rc %d: %s", res, strerror(errno));
            break;
        }
    }

    m_running = false;
}

void SDRPlayThread::callbackHelper(unsigned char* buf, uint32_t len, void* ctx)
{
    SDRPlayThread* thread = (SDRPlayThread*) ctx;
    thread->callback((const qint16*) buf, len/2);
}

void SDRPlayThread::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) // Infradyne
        {
            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) // Supradyne
        {
            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 // Centered
        {
            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);

    if(!m_running)
    {
        mirisdr_cancel_async(m_dev);
    }
}