mirror of
https://github.com/f4exb/sdrangel.git
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455 lines
12 KiB
C++
455 lines
12 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016 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 "sdrdaemonbuffer.h"
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#include <QDebug>
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#include <cassert>
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#include <cstring>
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#include <cmath>
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#include <lz4.h>
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const int SDRdaemonBuffer::m_udpPayloadSize = 512;
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const int SDRdaemonBuffer::m_sampleSize = 2;
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const int SDRdaemonBuffer::m_iqSampleSize = 2 * m_sampleSize;
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const int SDRdaemonBuffer::m_rawBufferLengthSeconds = 8; // should be even
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const int SDRdaemonBuffer::m_rawBufferMinNbFrames = 50;
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SDRdaemonBuffer::SDRdaemonBuffer(uint32_t throttlems) :
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m_throttlemsNominal(throttlems),
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m_rawSize(0),
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m_rawBuffer(0),
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m_sampleRateStream(0),
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m_sampleRate(0),
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m_sampleBytes(2),
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m_sampleBits(12),
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m_sync(false),
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m_syncLock(false),
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m_lz4(false),
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m_nbBlocks(0),
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m_bytesInBlock(0),
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m_dataCRC(0),
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m_inCount(0),
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m_lz4InCount(0),
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m_lz4InSize(0),
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m_lz4InBuffer(0),
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m_lz4OutBuffer(0),
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m_frameSize(0),
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m_bufferLenSec(0.0),
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m_nbLz4Decodes(0),
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m_nbLz4SuccessfulDecodes(0),
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m_nbLz4CRCOK(0),
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m_nbLastLz4SuccessfulDecodes(0),
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m_nbLastLz4CRCOK(0),
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m_writeIndex(0),
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m_readIndex(0),
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m_readSize(0),
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m_readBuffer(0),
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m_autoFollowRate(false),
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m_autoCorrBuffer(false),
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m_skewTest(false),
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m_skewCorrection(false),
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m_resetIndexes(false),
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m_readCount(0),
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m_writeCount(0),
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m_nbCycles(0),
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m_nbReads(0),
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m_balCorrection(0),
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m_balCorrLimit(0)
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{
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m_currentMeta.init();
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}
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SDRdaemonBuffer::~SDRdaemonBuffer()
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{
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if (m_rawBuffer) {
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delete[] m_rawBuffer;
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}
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if (m_lz4InBuffer) {
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delete[] m_lz4InBuffer;
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}
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if (m_lz4OutBuffer) {
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delete[] m_lz4OutBuffer;
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}
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if (m_readBuffer) {
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delete[] m_readBuffer;
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}
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}
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void SDRdaemonBuffer::updateBufferSize(uint32_t sampleRate)
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{
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uint32_t rawSize = sampleRate * m_iqSampleSize * m_rawBufferLengthSeconds; // store worth of this seconds of samples at this sample rate
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if ((m_frameSize > 0) && (rawSize / m_frameSize < m_rawBufferMinNbFrames))
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{
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rawSize = m_rawBufferMinNbFrames * m_frameSize; // ensure a minimal size of this times the write block size so that auto follow ups work fine
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}
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if (rawSize != m_rawSize)
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{
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m_rawSize = rawSize;
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m_balCorrLimit = sampleRate / 50; // +/- 20 ms correction max per read
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m_bufferLenSec = m_rawSize / (sampleRate * m_iqSampleSize);
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if (m_rawBuffer) {
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delete[] m_rawBuffer;
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}
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m_rawBuffer = new uint8_t[m_rawSize];
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resetIndexes();
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qDebug() << "SDRdaemonBuffer::updateBufferSize:"
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<< " sampleRate: " << sampleRate
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<< " m_frameSize: " << m_frameSize
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<< " m_rawSize: " << m_rawSize;
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}
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}
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void SDRdaemonBuffer::updateLZ4Sizes(uint32_t frameSize)
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{
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uint32_t maxInputSize = LZ4_compressBound(frameSize);
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if (m_lz4InBuffer) {
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delete[] m_lz4InBuffer;
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}
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m_lz4InBuffer = new uint8_t[maxInputSize];
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if (m_lz4OutBuffer) {
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delete[] m_lz4OutBuffer;
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}
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m_lz4OutBuffer = new uint8_t[frameSize];
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}
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void SDRdaemonBuffer::updateReadBufferSize(uint32_t length)
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{
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if (m_readBuffer) {
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delete[] m_readBuffer;
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}
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m_readBuffer = new uint8_t[length];
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}
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bool SDRdaemonBuffer::readMeta(char *array, uint32_t length)
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{
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assert(length >= sizeof(MetaData) + 8);
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MetaData *metaData = (MetaData *) array;
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if (m_crc64.calculate_crc((uint8_t *) array, sizeof(MetaData) - 8) == metaData->m_crc)
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{
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// sync condition:
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if (m_currentMeta.m_blockSize > 0)
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{
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uint32_t nbBlocks = m_currentMeta.m_nbBytes / m_currentMeta.m_blockSize;
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m_syncLock = nbBlocks + (m_lz4 ? 2 : 1) == m_nbBlocks;
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//qDebug("SDRdaemonBuffer::readMeta: m_nbBlocks: %d:%d %s", nbBlocks, m_nbBlocks, (m_syncLock ? "locked" : "unlocked"));
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}
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else
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{
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m_syncLock = false;
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}
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memcpy((void *) &m_dataCRC, (const void *) &array[sizeof(MetaData)], 8);
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m_nbBlocks = 0;
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m_inCount = 0;
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if (!m_lz4 && !(m_currentMeta == *metaData))
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{
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printMeta(QString("SDRdaemonBuffer::readMeta"), metaData);
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}
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m_currentMeta = *metaData;
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// sanity checks
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if (metaData->m_blockSize == m_udpPayloadSize) // sent blocksize matches given blocksize
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{
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m_sampleBytes = metaData->m_sampleBytes & 0x0F;
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uint32_t frameSize = m_iqSampleSize * metaData->m_nbSamples * metaData->m_nbBlocks;
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int sampleRate = metaData->m_sampleRate;
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if (sampleRate != m_sampleRateStream) // change of nominal stream sample rate
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{
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updateBufferSize(sampleRate);
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m_sampleRateStream = sampleRate;
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m_sampleRate = sampleRate;
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}
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// auto skew rate compensation
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if (m_autoFollowRate)
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{
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if (m_skewCorrection)
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{
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int64_t deltaRate = (m_writeCount - m_readCount) / (m_nbCycles * m_rawBufferLengthSeconds * m_iqSampleSize);
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m_sampleRate = ((m_sampleRate + deltaRate) / m_iqSampleSize) * m_iqSampleSize; // ensure it is a multiple of the I/Q sample size
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resetIndexes();
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}
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}
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else
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{
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m_sampleRate = sampleRate;
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}
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// Reset indexes if requested
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if (m_resetIndexes)
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{
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resetIndexes();
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m_resetIndexes = false;
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}
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if (metaData->m_sampleBytes & 0x10)
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{
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m_lz4 = true;
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m_lz4InSize = metaData->m_nbBytes; // compressed input size
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m_lz4InCount = 0;
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if (frameSize != m_frameSize)
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{
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updateLZ4Sizes(frameSize);
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}
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}
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else
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{
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m_lz4 = false;
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}
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if (frameSize != m_frameSize) {
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m_frameSize = frameSize;
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updateBufferSize(m_sampleRate);
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}
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m_sync = true;
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}
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else
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{
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m_sync = false;
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}
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return m_sync;
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}
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else
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{
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return false;
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}
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}
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void SDRdaemonBuffer::writeData(char *array, uint32_t length)
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{
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if ((m_sync) && (m_nbBlocks > 0))
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{
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if (m_lz4)
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{
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writeDataLZ4(array, length);
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}
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else
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{
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writeToRawBufferUncompressed(array, length);
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}
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}
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}
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uint8_t *SDRdaemonBuffer::readData(int32_t length)
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{
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// auto compensation calculations
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if (m_skewTest && ((m_readIndex + length) > (m_rawSize / 2)))
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{
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// auto follow sample rate calculation
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int dIndex = (m_readIndex - m_writeIndex > 0 ? m_readIndex - m_writeIndex : m_writeIndex - m_readIndex); // absolute delta
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m_skewCorrection = (dIndex < m_rawSize / 10); // close by 10%
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m_nbCycles++;
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// auto R/W balance calculation
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if ((m_nbReads > 5*m_rawBufferLengthSeconds) && m_autoCorrBuffer)
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{
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int32_t dBytes;
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int32_t dI = (m_rawSize / 2) - m_readIndex; // delta of read index to the middle of buffer (positive)
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if (m_readIndex > m_writeIndex) { // write leads
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dBytes = m_writeIndex + dI; // positive from start of buffer + delta read index
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} else { // read leads
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dBytes = m_writeIndex - (int32_t) m_rawSize + dI; // negative from end of buffer minus delta read index
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}
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m_balCorrection = (m_balCorrection / 4) + ((int32_t) dBytes / (int32_t) (m_nbReads * m_iqSampleSize)); // correction is in number of samples. Alpha = 0.25
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if (m_balCorrection < -m_balCorrLimit) {
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m_balCorrection = -m_balCorrLimit;
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} else if (m_balCorrection > m_balCorrLimit) {
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m_balCorrection = m_balCorrLimit;
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}
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}
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else
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{
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m_balCorrection = 0;
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}
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m_nbReads = 0;
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// un-arm
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m_skewTest = false;
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}
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m_readCount += length;
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m_nbReads++;
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if (m_readIndex + length < m_rawSize)
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{
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uint32_t readIndex = m_readIndex;
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m_readIndex += length;
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return &m_rawBuffer[readIndex];
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}
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else if (m_readIndex + length == m_rawSize)
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{
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uint32_t readIndex = m_readIndex;
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m_readIndex = 0;
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m_skewTest = true; // re-arm
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return &m_rawBuffer[readIndex];
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}
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else
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{
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if (length > m_readSize)
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{
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updateReadBufferSize(length);
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m_readSize = length;
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}
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std::memcpy((void *) m_readBuffer, (const void *) &m_rawBuffer[m_readIndex], m_rawSize - m_readIndex);
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length -= m_rawSize - m_readIndex;
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std::memcpy((void *) &m_readBuffer[m_rawSize - m_readIndex], (const void *) m_rawBuffer, length);
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m_readIndex = length;
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m_skewTest = true; // re-arm
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return m_readBuffer;
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}
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}
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void SDRdaemonBuffer::writeDataLZ4(const char *array, uint32_t length)
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{
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if (m_lz4InCount + length < m_lz4InSize)
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{
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std::memcpy((void *) &m_lz4InBuffer[m_lz4InCount], (const void *) array, length);
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m_lz4InCount += length;
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}
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else
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{
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std::memcpy((void *) &m_lz4InBuffer[m_lz4InCount], (const void *) array, m_lz4InSize - m_lz4InCount); // copy rest of data in compressed Buffer
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m_lz4InCount += length;
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}
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if (m_lz4InCount >= m_lz4InSize) // full input compressed block retrieved
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{
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if (m_nbLz4Decodes == 100)
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{
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qDebug() << "SDRdaemonBuffer::writeAndReadLZ4:"
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<< " decoding: " << m_nbLz4CRCOK
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<< ":" << m_nbLz4SuccessfulDecodes
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<< "/" << m_nbLz4Decodes;
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m_nbLastLz4SuccessfulDecodes = m_nbLz4SuccessfulDecodes;
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m_nbLastLz4CRCOK = m_nbLz4CRCOK;
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m_nbLz4Decodes = 0;
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m_nbLz4SuccessfulDecodes = 0;
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m_nbLz4CRCOK = 0;
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}
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writeToRawBufferLZ4();
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m_lz4InCount = 0;
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}
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}
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void SDRdaemonBuffer::writeToRawBufferLZ4()
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{
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uint64_t crc64 = m_crc64.calculate_crc(m_lz4InBuffer, m_lz4InSize);
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if (memcmp(&crc64, &m_dataCRC, 8) == 0)
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{
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m_nbLz4CRCOK++;
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}
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else
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{
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return;
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}
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int compressedSize = LZ4_decompress_fast((const char*) m_lz4InBuffer, (char*) m_lz4OutBuffer, m_frameSize);
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m_nbLz4Decodes++;
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if (compressedSize == m_lz4InSize)
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{
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m_nbLz4SuccessfulDecodes++;
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writeToRawBufferUncompressed((const char *) m_lz4OutBuffer, m_frameSize);
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}
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}
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void SDRdaemonBuffer::writeToRawBufferUncompressed(const char *array, uint32_t length)
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{
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// TODO: handle the 1 byte per I or Q sample
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if (m_writeIndex + length < m_rawSize)
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{
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std::memcpy((void *) &m_rawBuffer[m_writeIndex], (const void *) array, length);
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m_writeIndex += length;
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}
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else if (m_writeIndex + length == m_rawSize)
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{
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std::memcpy((void *) &m_rawBuffer[m_writeIndex], (const void *) array, length);
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m_writeIndex = 0;
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}
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else
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{
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std::memcpy((void *) &m_rawBuffer[m_writeIndex], (const void *) array, m_rawSize - m_writeIndex);
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length -= m_rawSize - m_writeIndex;
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std::memcpy((void *) m_rawBuffer, (const void *) &array[m_rawSize - m_writeIndex], length);
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m_writeIndex = length;
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}
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m_writeCount += length;
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}
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void SDRdaemonBuffer::resetIndexes()
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{
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m_writeIndex = 0;
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m_readIndex = m_rawSize / 2;
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m_readCount = 0;
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m_writeCount = 0;
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m_nbCycles = 0;
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m_skewTest = false;
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m_skewCorrection = false;
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m_nbReads = 0;
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m_balCorrection = 0;
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}
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void SDRdaemonBuffer::updateBlockCounts(uint32_t nbBytesReceived)
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{
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m_nbBlocks += m_bytesInBlock + nbBytesReceived > m_udpPayloadSize ? 1 : 0;
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m_bytesInBlock = m_bytesInBlock + nbBytesReceived > m_udpPayloadSize ? nbBytesReceived : m_bytesInBlock + nbBytesReceived;
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}
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void SDRdaemonBuffer::printMeta(const QString& header, MetaData *metaData)
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{
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qDebug() << header << ": "
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<< "|" << metaData->m_centerFrequency
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<< ":" << metaData->m_sampleRate
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<< ":" << (int) (metaData->m_sampleBytes & 0xF)
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<< ":" << (int) metaData->m_sampleBits
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<< ":" << metaData->m_blockSize
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<< ":" << metaData->m_nbSamples
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<< "||" << metaData->m_nbBlocks
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<< ":" << metaData->m_nbBytes
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<< "|" << metaData->m_tv_sec
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<< ":" << metaData->m_tv_usec;
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}
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