sdrangel/plugins/samplesink/limesdroutput/limesdroutputthread.cpp

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017 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 //
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// (at your option) any later version. //
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// //
// 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 <errno.h>
#include <algorithm>
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#include "dsp/samplesourcefifo.h"
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#include "limesdroutputthread.h"
#include "limesdroutputsettings.h"
LimeSDROutputThread::LimeSDROutputThread(lms_stream_t* stream, SampleSourceFifo* sampleFifo, QObject* parent) :
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QThread(parent),
m_running(false),
m_stream(stream),
m_sampleFifo(sampleFifo),
m_log2Interp(0)
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{
std::fill(m_buf, m_buf + 2*DeviceLimeSDR::blockSize, 0);
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}
LimeSDROutputThread::~LimeSDROutputThread()
{
stopWork();
}
void LimeSDROutputThread::startWork()
{
if (m_running) return; // return if running already
if (LMS_StartStream(m_stream) < 0) {
qCritical("LimeSDROutputThread::startWork: could not start stream");
} else {
usleep(50000);
qDebug("LimeSDROutputThread::startWork: stream started");
}
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m_startWaitMutex.lock();
start();
while(!m_running)
m_startWaiter.wait(&m_startWaitMutex, 100);
m_startWaitMutex.unlock();
}
void LimeSDROutputThread::stopWork()
{
if (!m_running) return; // return if not running
m_running = false;
wait();
if (LMS_StopStream(m_stream) < 0) {
qCritical("LimeSDROutputThread::stopWork: could not stop stream");
} else {
usleep(50000);
qDebug("LimeSDROutputThread::stopWork: stream stopped");
}
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}
void LimeSDROutputThread::setLog2Interpolation(unsigned int log2_interp)
{
m_log2Interp = log2_interp;
}
void LimeSDROutputThread::run()
{
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int res;
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lms_stream_meta_t metadata; //Use metadata for additional control over sample receive function behaviour
metadata.flushPartialPacket = false; //Do not discard data remainder when read size differs from packet size
metadata.waitForTimestamp = false; //Do not wait for specific timestamps
m_running = true;
m_startWaiter.wakeAll();
while (m_running)
{
callback(m_buf, DeviceLimeSDR::blockSize);
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res = LMS_SendStream(m_stream, (void *) m_buf, DeviceLimeSDR::blockSize, &metadata, 1000000);
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if (res < 0)
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{
qCritical("LimeSDROutputThread::run write error: %s", strerror(errno));
break;
}
else if (res != DeviceLimeSDR::blockSize)
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{
qDebug("LimeSDROutputThread::run written %d/%d samples", res, DeviceLimeSDR::blockSize);
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}
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}
m_running = false;
}
// Interpolate according to specified log2 (ex: log2=4 => decim=16)
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void LimeSDROutputThread::callback(qint16* buf, qint32 len)
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{
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 LimeSDROutputThread::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);
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if (m_log2Interp == 0)
{
m_interpolators.interpolate1(&beginRead, buf, len);
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}
else
{
switch (m_log2Interp)
{
case 1:
m_interpolators.interpolate2_cen(&beginRead, buf, len);
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break;
case 2:
m_interpolators.interpolate4_cen(&beginRead, buf, len);
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break;
case 3:
m_interpolators.interpolate8_cen(&beginRead, buf, len);
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break;
case 4:
m_interpolators.interpolate16_cen(&beginRead, buf, len);
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break;
case 5:
m_interpolators.interpolate32_cen(&beginRead, buf, len);
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break;
case 6:
m_interpolators.interpolate64_cen(&beginRead, buf, len);
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break;
default:
break;
}
}
}