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sdrangel/plugins/samplesource/limesdrinput/limesdrinputthread.cpp

138 lines
4.2 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// 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 //
// (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 <errno.h>
#include <algorithm>
#include "limesdrinputsettings.h"
#include "limesdrinputthread.h"
LimeSDRInputThread::LimeSDRInputThread(lms_stream_t* stream, SampleSinkFifo* sampleFifo, QObject* parent) :
QThread(parent),
m_running(false),
m_stream(stream),
m_convertBuffer(LIMESDR_BLOCKSIZE),
m_sampleFifo(sampleFifo),
m_log2Decim(0)
{
std::fill(m_buf, m_buf + 2*LIMESDR_BLOCKSIZE, 0);
}
LimeSDRInputThread::~LimeSDRInputThread()
{
stopWork();
}
void LimeSDRInputThread::startWork()
{
if (m_running) return; // return if running already
if (LMS_StartStream(m_stream) < 0) {
qCritical("LimeSDRInputThread::startWork: could not start stream");
} else {
usleep(50000);
qDebug("LimeSDRInputThread::startWork: stream started");
}
m_startWaitMutex.lock();
start();
while(!m_running)
m_startWaiter.wait(&m_startWaitMutex, 100);
m_startWaitMutex.unlock();
}
void LimeSDRInputThread::stopWork()
{
if (!m_running) return; // return if not running
m_running = false;
wait();
if (LMS_StopStream(m_stream) < 0) {
qCritical("LimeSDRInputThread::stopWork: could not stop stream");
} else {
usleep(50000);
qDebug("LimeSDRInputThread::stopWork: stream stopped");
}
}
void LimeSDRInputThread::setLog2Decimation(unsigned int log2_decim)
{
m_log2Decim = log2_decim;
}
void LimeSDRInputThread::run()
{
int res;
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)
{
if ((res = LMS_RecvStream(m_stream, (void *) m_buf, LIMESDR_BLOCKSIZE, &metadata, 1000)) < 0)
{
qCritical("LimeSDRInputThread::run read error: %s", strerror(errno));
break;
}
callback(m_buf, 2 * res);
}
m_running = false;
}
// Decimate according to specified log2 (ex: log2=4 => decim=16)
void LimeSDRInputThread::callback(const qint16* buf, qint32 len)
{
SampleVector::iterator it = m_convertBuffer.begin();
switch (m_log2Decim)
{
case 0:
m_decimators.decimate1(&it, buf, len);
break;
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);
}