mirror of
https://github.com/f4exb/sdrangel.git
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156 lines
5.3 KiB
C++
156 lines
5.3 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 <unistd.h>
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#include "plutosdr/deviceplutosdrbox.h"
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#include "plutosdroutputsettings.h"
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#include "iio.h"
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#include "plutosdroutputthread.h"
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PlutoSDROutputThread::PlutoSDROutputThread(uint32_t blocksizeSamples, DevicePlutoSDRBox* plutoBox, SampleSourceFifo* sampleFifo, QObject* parent) :
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QThread(parent),
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m_running(false),
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m_plutoBox(plutoBox),
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m_blockSizeSamples(blocksizeSamples),
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m_sampleFifo(sampleFifo),
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m_log2Interp(0)
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{
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m_buf = new qint16[blocksizeSamples*2];
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// m_bufConv = new qint16[blocksizeSamples*(sizeof(Sample)/sizeof(qint16))];
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}
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PlutoSDROutputThread::~PlutoSDROutputThread()
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{
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stopWork();
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delete[] m_buf;
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}
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void PlutoSDROutputThread::startWork()
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{
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if (m_running) return; // return if running already
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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 PlutoSDROutputThread::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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}
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void PlutoSDROutputThread::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 PlutoSDROutputThread::run()
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{
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std::ptrdiff_t p_inc = m_plutoBox->txBufferStep();
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qDebug("PlutoSDROutputThread::run: txBufferStep: %ld bytes", p_inc);
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qDebug("PlutoSDROutputThread::run: Rx sample size is %ld bytes", m_plutoBox->getRxSampleSize());
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qDebug("PlutoSDROutputThread::run: Tx sample size is %ld bytes", m_plutoBox->getTxSampleSize());
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qDebug("PlutoSDROutputThread::run: nominal nbytes_tx is %d bytes", m_blockSizeSamples*4);
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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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ssize_t nbytes_tx;
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char *p_dat, *p_end;
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int ihs; // half sample index (I then Q to make a sample)
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convert(m_buf, 2*m_blockSizeSamples); // size given in number of int16_t (I and Q interleaved)
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// WRITE: Get pointers to TX buf and write IQ to TX buf port 0
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p_end = m_plutoBox->txBufferEnd();
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ihs = 0;
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// p_inc is 2 on a char* buffer therefore each iteration processes only the I or Q sample
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// I and Q samples are processed one after the other
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// conversion is not needed as samples are little endian
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for (p_dat = m_plutoBox->txBufferFirst(), ihs = 0; p_dat < p_end; p_dat += p_inc, ihs += 2)
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{
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m_plutoBox->txChannelConvert((int16_t*) p_dat, &m_buf[ihs]);
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//*((int16_t*)p_dat) = m_buf[ihs] << 4;
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}
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// Schedule TX buffer for sending
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nbytes_tx = m_plutoBox->txBufferPush();
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if (nbytes_tx != 4*m_blockSizeSamples)
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{
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qDebug("PlutoSDROutputThread::run: error pushing buf %d / %d\n", (int) nbytes_tx, (int) 4*m_blockSizeSamples);
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usleep(200000);
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continue;
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}
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}
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m_running = false;
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}
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// Decimate according to specified log2 (ex: log2=4 => decim=16)
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// len is in half samples (I or Q) thus the size up to which buf is filled
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// SampleVector contains full (I, Q) samples
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void PlutoSDROutputThread::convert(qint16* buf, qint32 len)
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{
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// pull samples from baseband generator
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SampleVector::iterator beginRead;
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m_sampleFifo->readAdvance(beginRead, len/(2*(1<<m_log2Interp)));
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beginRead -= len/2;
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if (m_log2Interp == 0)
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{
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m_interpolators.interpolate1(&beginRead, buf, len);
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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);
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break;
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case 2:
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m_interpolators.interpolate4_cen(&beginRead, buf, len);
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break;
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case 3:
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m_interpolators.interpolate8_cen(&beginRead, buf, len);
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break;
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case 4:
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m_interpolators.interpolate16_cen(&beginRead, buf, len);
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break;
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case 5:
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m_interpolators.interpolate32_cen(&beginRead, buf, len);
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break;
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case 6:
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m_interpolators.interpolate64_cen(&beginRead, buf, len);
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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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