mirror of
https://github.com/f4exb/sdrangel.git
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146 lines
4.6 KiB
C++
146 lines
4.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2017 Edouard Griffiths, F4EXB //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <errno.h>
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#include <algorithm>
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#include "limesdroutputthread.h"
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#include "limesdroutputsettings.h"
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LimeSDROutputThread::LimeSDROutputThread(lms_stream_t* stream, SampleSourceFifo* sampleFifo, QObject* parent) :
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QThread(parent),
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m_running(false),
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m_stream(stream),
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m_sampleFifo(sampleFifo),
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m_log2Interp(0)
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{
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std::fill(m_buf, m_buf + 2*LIMESDROUTPUT_BLOCKSIZE, 0);
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}
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LimeSDROutputThread::~LimeSDROutputThread()
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{
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stopWork();
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}
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void LimeSDROutputThread::startWork()
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{
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if (m_running) return; // return if running already
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if (LMS_StartStream(m_stream) < 0) {
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qCritical("LimeSDROutputThread::startWork: could not start stream");
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} else {
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usleep(50000);
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qDebug("LimeSDROutputThread::startWork: stream started");
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}
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m_startWaitMutex.lock();
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start();
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while(!m_running)
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m_startWaiter.wait(&m_startWaitMutex, 100);
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m_startWaitMutex.unlock();
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}
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void LimeSDROutputThread::stopWork()
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{
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if (!m_running) return; // return if not running
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m_running = false;
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wait();
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if (LMS_StopStream(m_stream) < 0) {
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qCritical("LimeSDROutputThread::stopWork: could not stop stream");
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} else {
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usleep(50000);
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qDebug("LimeSDROutputThread::stopWork: stream stopped");
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}
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}
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void LimeSDROutputThread::setLog2Interpolation(unsigned int log2_interp)
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{
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m_log2Interp = log2_interp;
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}
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void LimeSDROutputThread::run()
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{
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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
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metadata.flushPartialPacket = false; //Do not discard data remainder when read size differs from packet size
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metadata.waitForTimestamp = false; //Do not wait for specific timestamps
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m_running = true;
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m_startWaiter.wakeAll();
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while (m_running)
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{
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callback(m_buf, LIMESDROUTPUT_BLOCKSIZE);
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res = LMS_SendStream(m_stream, (void *) m_buf, LIMESDROUTPUT_BLOCKSIZE, &metadata, 1000000);
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if (res < 0)
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{
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qCritical("LimeSDROutputThread::run write error: %s", strerror(errno));
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break;
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}
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else if (res != LIMESDROUTPUT_BLOCKSIZE)
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{
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qDebug("LimeSDROutputThread::run written %d/%d samples", res, LIMESDROUTPUT_BLOCKSIZE);
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}
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}
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m_running = false;
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}
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// 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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{
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SampleVector::iterator beginRead;
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m_sampleFifo->readAdvance(beginRead, len/(1<<m_log2Interp));
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beginRead -= len;
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if (m_log2Interp == 0)
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{
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m_interpolators.interpolate1(&beginRead, buf, len*2);
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}
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else
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{
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switch (m_log2Interp)
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{
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case 1:
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m_interpolators.interpolate2_cen(&beginRead, buf, len*2);
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break;
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case 2:
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m_interpolators.interpolate4_cen(&beginRead, buf, len*2);
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break;
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case 3:
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m_interpolators.interpolate8_cen(&beginRead, buf, len*2);
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break;
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case 4:
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m_interpolators.interpolate16_cen(&beginRead, buf, len*2);
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break;
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case 5:
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m_interpolators.interpolate32_cen(&beginRead, buf, len*2);
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break;
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case 6:
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m_interpolators.interpolate64_cen(&beginRead, buf, len*2);
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break;
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default:
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break;
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}
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}
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}
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