mirror of
https://github.com/f4exb/sdrangel.git
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144 lines
5.5 KiB
C++
144 lines
5.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016-2019 F4EXB //
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// written by Edouard Griffiths //
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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 <QDebug>
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#include "dsp/devicesamplesink.h"
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DeviceSampleSink::DeviceSampleSink() :
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m_sampleSourceFifo(1<<19),
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m_guiMessageQueue(0)
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{
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connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
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}
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DeviceSampleSink::~DeviceSampleSink()
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{
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}
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void DeviceSampleSink::handleInputMessages()
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{
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Message* message;
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while ((message = m_inputMessageQueue.pop()) != 0)
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{
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if (handleMessage(*message))
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{
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delete message;
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}
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}
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}
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qint64 DeviceSampleSink::calculateDeviceCenterFrequency(
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quint64 centerFrequency,
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qint64 transverterDeltaFrequency,
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int log2Interp,
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fcPos_t fcPos,
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quint32 devSampleRate,
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bool transverterMode)
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{
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qint64 deviceCenterFrequency = centerFrequency;
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deviceCenterFrequency -= transverterMode ? transverterDeltaFrequency : 0;
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deviceCenterFrequency = deviceCenterFrequency < 0 ? 0 : deviceCenterFrequency;
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qint64 f_img = deviceCenterFrequency;
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deviceCenterFrequency -= calculateFrequencyShift(log2Interp, fcPos, devSampleRate);
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f_img -= 2*calculateFrequencyShift(log2Interp, fcPos, devSampleRate);
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qDebug() << "DeviceSampleSink::calculateDeviceCenterFrequency:"
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<< " desired center freq: " << centerFrequency << " Hz"
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<< " device center freq: " << deviceCenterFrequency << " Hz"
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<< " device sample rate: " << devSampleRate << "S/s"
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<< " Actual sample rate: " << devSampleRate/(1<<log2Interp) << "S/s"
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<< " center freq position code: " << fcPos
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<< " image frequency: " << f_img << "Hz";
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return deviceCenterFrequency;
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}
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qint64 DeviceSampleSink::calculateCenterFrequency(
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quint64 deviceCenterFrequency,
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qint64 transverterDeltaFrequency,
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int log2Interp,
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fcPos_t fcPos,
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quint32 devSampleRate,
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bool transverterMode)
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{
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qint64 centerFrequency = deviceCenterFrequency;
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centerFrequency += calculateFrequencyShift(log2Interp, fcPos, devSampleRate);
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centerFrequency += transverterMode ? transverterDeltaFrequency : 0;
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centerFrequency = centerFrequency < 0 ? 0 : centerFrequency;
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qDebug() << "DeviceSampleSink::calculateCenterFrequency:"
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<< " desired center freq: " << centerFrequency << " Hz"
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<< " device center freq: " << deviceCenterFrequency << " Hz"
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<< " device sample rate: " << devSampleRate << "S/s"
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<< " Actual sample rate: " << devSampleRate/(1<<log2Interp) << "S/s"
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<< " center freq position code: " << fcPos;
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return centerFrequency;
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}
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/**
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* log2Interp = 0: no shift
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*
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* log2Interp = 1: middle of side band (inf or sup: 1/2)
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* ^ | ^
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* | inf | inf | sup | sup |
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*
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* log2Interp = 2: middle of far side half side band (inf, inf or sup, sup: 1/2 + 1/4)
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* ^ | ^
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* | inf | inf | sup | sup |
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*
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* log2Interp = 3: inf, inf, sup or sup, sup, inf: 1/2 + 1/4 - 1/8 = 5/8
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* log2Interp = 4: inf, inf, sup, inf or sup, sup, inf, sup: 1/2 + 1/4 - 1/8 + 1/16 = 11/16
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* log2Interp = 5: inf, inf, sup, inf, sup or sup, sup, inf, sup, inf: 1/2 + 1/4 - 1/8 + 1/16 - 1/32 = 21/32
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* log2Interp = 6: inf, sup, inf, sup, inf, sup or sup, inf, sup, inf, sup, inf: 1/2 - 1/4 + 1/8 -1/16 + 1/32 - 1/64 = 21/64
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*
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*/
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qint32 DeviceSampleSink::calculateFrequencyShift(
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int log2Interp,
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fcPos_t fcPos,
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quint32 devSampleRate)
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{
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if (fcPos == FC_POS_CENTER) {
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return 0;
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}
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int sign = fcPos == FC_POS_INFRA ? -1 : 1;
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int halfSampleRate = devSampleRate / 2; // fractions are relative to sideband thus based on half the sample rate
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if (log2Interp == 0) {
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return 0;
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} else if (log2Interp == 1) {
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return sign * (halfSampleRate / 2);
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} else if (log2Interp == 2) {
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return sign * ((halfSampleRate * 3) / 4);
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} else if (log2Interp == 3) {
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return sign * ((halfSampleRate * 5) / 8);
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} else if (log2Interp == 4) {
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return sign * ((halfSampleRate * 11) / 16);
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} else if (log2Interp == 5) {
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return sign * ((halfSampleRate * 21) / 32);
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} else if (log2Interp == 6) {
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return sign * ((halfSampleRate * 21) / 64);
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} else {
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return 0;
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}
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}
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