sdrangel/plugins/samplesink/bladerf1output/bladerf1outputthread.cpp

///////////////////////////////////////////////////////////////////////////////////
// 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>

#include "dsp/samplesourcefifo.h"

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& data = m_sampleFifo->getData();
    unsigned int iPart1Begin, iPart1End, iPart2Begin, iPart2End;
    m_sampleFifo->read(len/(1<<m_log2Interp), iPart1Begin, iPart1End, iPart2Begin, iPart2End);

    if (iPart1Begin != iPart1End) {
        callbackPart(buf, data, iPart1Begin, iPart1End);
    }

    unsigned int shift = (iPart1End - iPart1Begin)*(1<<m_log2Interp);

    if (iPart2Begin != iPart2End) {
        callbackPart(buf + 2*shift, data, iPart2Begin, iPart2End);
    }
}

void Bladerf1OutputThread::callbackPart(qint16* buf, SampleVector& data, unsigned int iBegin, unsigned int iEnd)
{
    SampleVector::iterator beginRead = data.begin() + iBegin;
    int len = 2*(iEnd - iBegin)*(1<<m_log2Interp);

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