bladerf1outputthread.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 "bladerf1outputthread.h"

#include <stdio.h>
#include <errno.h>
#include <algorithm>



Bladerf1OutputThread::Bladerf1OutputThread(struct bladerf* dev, SampleSourceFifo* sampleFifo, QObject* parent) :
    QThread(parent),
    m_running(false),
    m_dev(dev),
    m_sampleFifo(sampleFifo),
    m_log2Interp(0)
{
    std::fill(m_buf, m_buf + 2*BLADERFOUTPUT_BLOCKSIZE, 0);
}

Bladerf1OutputThread::~Bladerf1OutputThread()
{
    stopWork();
}

void Bladerf1OutputThread::startWork()
{
    m_startWaitMutex.lock();
    start();
    while(!m_running)
        m_startWaiter.wait(&m_startWaitMutex, 100);
    m_startWaitMutex.unlock();
}

void Bladerf1OutputThread::stopWork()
{
    m_running = false;
    wait();
}

void Bladerf1OutputThread::setLog2Interpolation(unsigned int log2_interp)
{
    m_log2Interp = log2_interp;
}

void Bladerf1OutputThread::run()
{
    int res;

    m_running = true;
    m_startWaiter.wakeAll();

    while (m_running)
    {
        callback(m_buf, BLADERFOUTPUT_BLOCKSIZE);

        if((res = bladerf_sync_tx(m_dev, m_buf, BLADERFOUTPUT_BLOCKSIZE, NULL, 10000)) < 0)
        {
            qCritical("BladerdOutputThread:run: sync error: %s", strerror(errno));
            break;
        }
    }

    m_running = false;
}

//  Interpolate according to specified log2 (ex: log2=4 => decim=16)
void Bladerf1OutputThread::callback(qint16* buf, qint32 len)
{
    SampleVector::iterator beginRead;
    m_sampleFifo->readAdvance(beginRead, len/(1<<m_log2Interp));
    beginRead -= len;

    if (m_log2Interp == 0)
    {
        m_interpolators.interpolate1(&beginRead, buf, len*2);
    }
    else
    {
        switch (m_log2Interp)
        {
        case 1:
            m_interpolators.interpolate2_cen(&beginRead, buf, len*2, true);
            break;
        case 2:
            m_interpolators.interpolate4_cen(&beginRead, buf, len*2, true);
            break;
        case 3:
            m_interpolators.interpolate8_cen(&beginRead, buf, len*2, true);
            break;
        case 4:
            m_interpolators.interpolate16_cen(&beginRead, buf, len*2, true);
            break;
        case 5:
            m_interpolators.interpolate32_cen(&beginRead, buf, len*2, true);
            break;
        case 6:
            m_interpolators.interpolate64_cen(&beginRead, buf, len*2, true);
            break;
        default:
            break;
        }
    }
}