mirror of
https://github.com/f4exb/sdrangel.git
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318 lines
8.7 KiB
C++
318 lines
8.7 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2018 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 <stdio.h>
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#include <errno.h>
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#include "testsourcethread.h"
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#include "dsp/samplesinkfifo.h"
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#define TESTSOURCE_BLOCKSIZE 16384
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TestSourceThread::TestSourceThread(SampleSinkFifo* sampleFifo, QObject* parent) :
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QThread(parent),
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m_running(false),
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m_buf(0),
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m_bufsize(0),
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m_chunksize(0),
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m_convertBuffer(TESTSOURCE_BLOCKSIZE),
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m_sampleFifo(sampleFifo),
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m_frequencyShift(0),
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m_toneFrequency(440),
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m_modulation(TestSourceSettings::ModulationNone),
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m_amModulation(0.5f),
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m_fmDeviationUnit(0.0f),
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m_fmPhasor(0.0f),
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m_samplerate(48000),
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m_log2Decim(4),
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m_fcPos(0),
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m_bitSizeIndex(0),
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m_bitShift(8),
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m_amplitudeBits(127),
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m_dcBias(0.0f),
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m_iBias(0.0f),
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m_qBias(0.0f),
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m_phaseImbalance(0.0f),
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m_amplitudeBitsDC(0),
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m_amplitudeBitsI(127),
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m_amplitudeBitsQ(127),
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m_frequency(435*1000),
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m_fcPosShift(0),
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m_throttlems(TESTSOURCE_THROTTLE_MS),
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m_throttleToggle(false),
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m_mutex(QMutex::Recursive)
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{
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}
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TestSourceThread::~TestSourceThread()
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{
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stopWork();
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}
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void TestSourceThread::startWork()
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{
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m_startWaitMutex.lock();
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m_elapsedTimer.start();
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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 TestSourceThread::stopWork()
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{
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m_running = false;
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wait();
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}
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void TestSourceThread::setSamplerate(int samplerate)
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{
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QMutexLocker mutexLocker(&m_mutex);
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m_samplerate = samplerate;
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m_chunksize = 4 * ((m_samplerate * (m_throttlems+(m_throttleToggle ? 1 : 0))) / 1000);
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m_throttleToggle = !m_throttleToggle;
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m_nco.setFreq(m_frequencyShift, m_samplerate);
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m_toneNco.setFreq(m_toneFrequency, m_samplerate);
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}
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void TestSourceThread::setLog2Decimation(unsigned int log2_decim)
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{
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m_log2Decim = log2_decim;
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}
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void TestSourceThread::setFcPos(int fcPos)
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{
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m_fcPos = fcPos;
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}
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void TestSourceThread::setBitSize(quint32 bitSizeIndex)
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{
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switch (bitSizeIndex)
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{
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case 0:
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m_bitShift = 7;
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m_bitSizeIndex = 0;
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break;
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case 1:
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m_bitShift = 11;
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m_bitSizeIndex = 1;
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break;
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case 2:
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default:
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m_bitShift = 15;
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m_bitSizeIndex = 2;
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break;
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}
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}
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void TestSourceThread::setAmplitudeBits(int32_t amplitudeBits)
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{
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m_amplitudeBits = amplitudeBits;
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m_amplitudeBitsDC = m_dcBias * amplitudeBits;
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m_amplitudeBitsI = (1.0f + m_iBias) * amplitudeBits;
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m_amplitudeBitsQ = (1.0f + m_qBias) * amplitudeBits;
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}
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void TestSourceThread::setDCFactor(float dcFactor)
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{
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m_dcBias = dcFactor;
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m_amplitudeBitsDC = m_dcBias * m_amplitudeBits;
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}
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void TestSourceThread::setIFactor(float iFactor)
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{
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m_iBias = iFactor;
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m_amplitudeBitsI = (1.0f + m_iBias) * m_amplitudeBits;
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}
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void TestSourceThread::setQFactor(float iFactor)
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{
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m_qBias = iFactor;
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m_amplitudeBitsQ = (1.0f + m_qBias) * m_amplitudeBits;
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}
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void TestSourceThread::setPhaseImbalance(float phaseImbalance)
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{
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m_phaseImbalance = phaseImbalance;
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}
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void TestSourceThread::setFrequencyShift(int shift)
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{
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m_nco.setFreq(shift, m_samplerate);
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}
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void TestSourceThread::setToneFrequency(int toneFrequency)
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{
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m_toneNco.setFreq(toneFrequency, m_samplerate);
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}
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void TestSourceThread::setModulation(TestSourceSettings::Modulation modulation)
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{
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m_modulation = modulation;
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}
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void TestSourceThread::setAMModulation(float amModulation)
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{
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m_amModulation = amModulation < 0.0f ? 0.0f : amModulation > 1.0f ? 1.0f : amModulation;
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}
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void TestSourceThread::setFMDeviation(float deviation)
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{
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float fmDeviationUnit = deviation / (float) m_samplerate;
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m_fmDeviationUnit = fmDeviationUnit < 0.0f ? 0.0f : fmDeviationUnit > 0.5f ? 0.5f : fmDeviationUnit;
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qDebug("TestSourceThread::setFMDeviation: m_fmDeviationUnit: %f", m_fmDeviationUnit);
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}
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void TestSourceThread::run()
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{
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m_running = true;
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m_startWaiter.wakeAll();
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while (m_running) // actual work is in the tick() function
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{
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sleep(1);
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}
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m_running = false;
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}
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void TestSourceThread::setBuffers(quint32 chunksize)
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{
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if (chunksize > m_bufsize)
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{
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m_bufsize = chunksize;
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if (m_buf == 0)
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{
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qDebug() << "TestSourceThread::setBuffer: Allocate buffer: "
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<< " size: " << m_bufsize << " bytes"
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<< " #samples: " << (m_bufsize/4);
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m_buf = (qint16*) malloc(m_bufsize);
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}
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else
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{
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qDebug() << "TestSourceThread::setBuffer: Re-allocate buffer: "
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<< " size: " << m_bufsize << " bytes"
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<< " #samples: " << (m_bufsize/4);
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free(m_buf);
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m_buf = (qint16*) malloc(m_bufsize);
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}
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m_convertBuffer.resize(chunksize/4);
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}
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}
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void TestSourceThread::generate(quint32 chunksize)
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{
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int n = chunksize / 2;
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setBuffers(chunksize);
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for (int i = 0; i < n-1;)
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{
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switch (m_modulation)
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{
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case TestSourceSettings::ModulationAM:
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{
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Complex c = m_nco.nextIQ();
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Real t, re, im;
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pullAF(t);
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t = (t*m_amModulation + 1.0f)*0.5f;
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re = c.real()*t;
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im = c.imag()*t + m_phaseImbalance*re;
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m_buf[i++] = (int16_t) (re * (float) m_amplitudeBitsI) + m_amplitudeBitsDC;
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m_buf[i++] = (int16_t) (im * (float) m_amplitudeBitsQ);
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}
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break;
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case TestSourceSettings::ModulationFM:
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{
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Complex c = m_nco.nextIQ();
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Real t, re, im;
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pullAF(t);
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m_fmPhasor += m_fmDeviationUnit * t;
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m_fmPhasor = m_fmPhasor < -1.0f ? -m_fmPhasor - 1.0f : m_fmPhasor > 1.0f ? m_fmPhasor - 1.0f : m_fmPhasor;
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re = c.real()*cos(m_fmPhasor*M_PI) - c.imag()*sin(m_fmPhasor*M_PI);
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im = (c.real()*sin(m_fmPhasor*M_PI) + c.imag()*cos(m_fmPhasor*M_PI)) + m_phaseImbalance*re;
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m_buf[i++] = (int16_t) (re * (float) m_amplitudeBitsI) + m_amplitudeBitsDC;
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m_buf[i++] = (int16_t) (im * (float) m_amplitudeBitsQ);
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}
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break;
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case TestSourceSettings::ModulationNone:
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default:
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{
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Complex c = m_nco.nextIQ(m_phaseImbalance);
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m_buf[i++] = (int16_t) (c.real() * (float) m_amplitudeBitsI) + m_amplitudeBitsDC;
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m_buf[i++] = (int16_t) (c.imag() * (float) m_amplitudeBitsQ);
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}
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break;
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}
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}
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callback(m_buf, n);
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}
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void TestSourceThread::pullAF(Real& afSample)
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{
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afSample = m_toneNco.next();
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}
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// call appropriate conversion (decimation) routine depending on the number of sample bits
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void TestSourceThread::callback(const qint16* buf, qint32 len)
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{
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SampleVector::iterator it = m_convertBuffer.begin();
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switch (m_bitSizeIndex)
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{
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case 0: // 8 bit samples
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convert_8(&it, buf, len);
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break;
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case 1: // 12 bit samples
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convert_12(&it, buf, len);
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break;
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case 2: // 16 bit samples
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default:
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convert_16(&it, buf, len);
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break;
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}
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m_sampleFifo->write(m_convertBuffer.begin(), it);
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}
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void TestSourceThread::connectTimer(const QTimer& timer)
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{
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qDebug() << "TestSourceThread::connectTimer";
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connect(&timer, SIGNAL(timeout()), this, SLOT(tick()));
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}
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void TestSourceThread::tick()
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{
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if (m_running)
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{
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qint64 throttlems = m_elapsedTimer.restart();
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if (throttlems != m_throttlems)
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{
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QMutexLocker mutexLocker(&m_mutex);
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m_throttlems = throttlems;
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m_chunksize = 4 * ((m_samplerate * (m_throttlems+(m_throttleToggle ? 1 : 0))) / 1000);
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m_throttleToggle = !m_throttleToggle;
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}
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generate(m_chunksize);
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}
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}
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