mirror of
https://github.com/f4exb/sdrangel.git
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424 lines
16 KiB
C++
424 lines
16 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016-2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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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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// (at your option) any later version. //
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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 <cstring>
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#include <cmath>
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#include <algorithm>
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#include <boost/crc.hpp>
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#include <boost/cstdint.hpp>
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#include "remoteinputbuffer.h"
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RemoteInputBuffer::RemoteInputBuffer() :
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m_decoderSlots(nullptr),
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m_frames(nullptr),
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m_curNbBlocks(0),
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m_minNbBlocks(256),
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m_curOriginalBlocks(0),
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m_minOriginalBlocks(128),
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m_curNbRecovery(0),
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m_maxNbRecovery(0),
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m_framesDecoded(true),
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m_readIndex(0),
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m_readBuffer(0),
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m_readSize(0),
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m_bufferLenSec(0.0f),
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m_nbReads(0),
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m_nbWrites(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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setNbDecoderSlots(16);
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m_decoderIndexHead = m_nbDecoderSlots/2;
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m_tvOut_sec = 0;
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m_tvOut_usec = 0;
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m_readNbBytes = 1;
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m_paramsCM256.BlockBytes = sizeof(RemoteProtectedBlock); // never changes
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m_paramsCM256.OriginalCount = RemoteNbOrginalBlocks; // never changes
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if (!m_cm256.isInitialized()) {
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m_cm256_OK = false;
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qDebug() << "RemoteInputBuffer::RemoteInputBuffer: cannot initialize CM256 library";
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} else {
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m_cm256_OK = true;
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}
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std::fill(m_decoderSlots, m_decoderSlots + m_nbDecoderSlots, DecoderSlot());
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std::fill(m_frames, m_frames + m_nbDecoderSlots, BufferFrame());
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}
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RemoteInputBuffer::~RemoteInputBuffer()
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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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if (m_decoderSlots) {
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delete[] m_decoderSlots;
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}
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if (m_frames) {
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delete[] m_frames;
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}
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}
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void RemoteInputBuffer::setNbDecoderSlots(int nbDecoderSlots)
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{
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m_nbDecoderSlots = nbDecoderSlots;
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m_framesSize = m_nbDecoderSlots * (RemoteNbOrginalBlocks - 1) * RemoteNbBytesPerBlock;
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m_framesNbBytes = m_nbDecoderSlots * sizeof(BufferFrame);
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m_wrDeltaEstimate = m_framesNbBytes / 2;
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if (m_decoderSlots) {
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delete[] m_decoderSlots;
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}
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if (m_frames) {
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delete[] m_frames;
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}
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m_decoderSlots = new DecoderSlot[m_nbDecoderSlots];
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m_frames = new BufferFrame[m_nbDecoderSlots];
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m_frameHead = -1;
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initReadIndex();
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}
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void RemoteInputBuffer::setBufferLenSec(const RemoteMetaDataFEC& metaData)
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{
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m_bufferLenSec = (float) m_framesNbBytes / (float) (metaData.m_sampleRate * metaData.m_sampleBytes * 2);
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}
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void RemoteInputBuffer::initDecodeAllSlots()
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{
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for (int i = 0; i < m_nbDecoderSlots; i++)
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{
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m_decoderSlots[i].m_blockCount = 0;
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m_decoderSlots[i].m_originalCount = 0;
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m_decoderSlots[i].m_recoveryCount = 0;
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m_decoderSlots[i].m_decoded = false;
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m_decoderSlots[i].m_metaRetrieved = false;
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resetOriginalBlocks(i);
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memset((void *) m_decoderSlots[i].m_recoveryBlocks, 0, RemoteNbOrginalBlocks * sizeof(RemoteProtectedBlock));
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}
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}
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void RemoteInputBuffer::initDecodeSlot(int slotIndex)
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{
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// collect stats before voiding the slot
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m_curNbBlocks = m_decoderSlots[slotIndex].m_blockCount;
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m_curOriginalBlocks = m_decoderSlots[slotIndex].m_originalCount;
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m_curNbRecovery = m_decoderSlots[slotIndex].m_recoveryCount;
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m_avgNbBlocks(m_curNbBlocks);
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m_avgOrigBlocks(m_curOriginalBlocks);
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m_avgNbRecovery(m_curNbRecovery);
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m_framesDecoded = m_framesDecoded && m_decoderSlots[slotIndex].m_decoded;
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if (m_curNbBlocks < m_minNbBlocks) {
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m_minNbBlocks = m_curNbBlocks;
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}
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if (m_curOriginalBlocks < m_minOriginalBlocks) {
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m_minOriginalBlocks = m_curOriginalBlocks;
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}
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if (m_curNbRecovery > m_maxNbRecovery) {
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m_maxNbRecovery = m_curNbRecovery;
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}
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// void the slot
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m_decoderSlots[slotIndex].m_blockCount = 0;
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m_decoderSlots[slotIndex].m_originalCount = 0;
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m_decoderSlots[slotIndex].m_recoveryCount = 0;
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m_decoderSlots[slotIndex].m_decoded = false;
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m_decoderSlots[slotIndex].m_metaRetrieved = false;
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resetOriginalBlocks(slotIndex);
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memset((void *) m_decoderSlots[slotIndex].m_recoveryBlocks, 0, RemoteNbOrginalBlocks * sizeof(RemoteProtectedBlock));
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}
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void RemoteInputBuffer::initReadIndex()
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{
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m_readIndex = ((m_decoderIndexHead + (m_nbDecoderSlots/2)) % m_nbDecoderSlots) * sizeof(BufferFrame);
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m_wrDeltaEstimate = m_framesNbBytes / 2;
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m_nbReads = 0;
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m_nbWrites = 0;
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}
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void RemoteInputBuffer::rwCorrectionEstimate(int slotIndex)
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{
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if (m_nbReads >= 40) // check every ~1s as tick is ~50ms
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{
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int targetPivotSlot = (slotIndex + (m_nbDecoderSlots/2)) % m_nbDecoderSlots; // slot at half buffer opposite of current write slot
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int targetPivotIndex = targetPivotSlot * sizeof(BufferFrame); // buffer index corresponding to start of above slot
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int normalizedReadIndex = (m_readIndex < targetPivotIndex ? m_readIndex + m_nbDecoderSlots * sizeof(BufferFrame) : m_readIndex)
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- (targetPivotSlot * sizeof(BufferFrame)); // normalize read index so it is positive and zero at start of pivot slot
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int dBytes;
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int rwDelta = (m_nbReads * m_readNbBytes) - (m_nbWrites * sizeof(BufferFrame));
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if (normalizedReadIndex < (m_nbDecoderSlots/ 2) * (int) sizeof(BufferFrame)) // read leads
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{
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dBytes = - normalizedReadIndex - rwDelta;
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}
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else // read lags
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{
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int bufSize = (m_nbDecoderSlots * sizeof(BufferFrame));
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dBytes = bufSize - normalizedReadIndex - rwDelta;
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}
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// calculate exponential moving average on floating point for better accuracy (was int)
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double newCorrection = ((double) dBytes) / (((int) m_currentMeta.m_sampleBytes) * 2 * m_nbReads);
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m_balCorrection = 0.25*m_balCorrection + 0.75*newCorrection; // exponential average with alpha = 0.75 (original is wrong)
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//m_balCorrection = (m_balCorrection / 4) + (dBytes / (int) (m_currentMeta.m_sampleBytes * 2 * m_nbReads)); // 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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m_nbReads = 0;
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m_nbWrites = 0;
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}
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}
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void RemoteInputBuffer::checkSlotData(int slotIndex)
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{
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int pseudoWriteIndex = slotIndex * sizeof(BufferFrame);
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m_wrDeltaEstimate = pseudoWriteIndex - m_readIndex;
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int rwDelayBytes = (m_wrDeltaEstimate > 0 ? m_wrDeltaEstimate : sizeof(BufferFrame) * m_nbDecoderSlots + m_wrDeltaEstimate);
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int sampleRate = m_currentMeta.m_sampleRate;
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if (sampleRate > 0)
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{
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int64_t ts = m_currentMeta.m_tv_sec * 1000000LL + m_currentMeta.m_tv_usec;
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ts -= (rwDelayBytes * 1000000LL) / (sampleRate * 2 * m_currentMeta.m_sampleBytes);
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m_tvOut_sec = ts / 1000000LL;
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m_tvOut_usec = ts - (m_tvOut_sec * 1000000LL);
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}
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if (!m_decoderSlots[slotIndex].m_decoded)
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{
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qDebug() << "RemoteInputBuffer::checkSlotData: incomplete frame:"
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<< " slotIndex: " << slotIndex
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<< " m_blockCount: " << m_decoderSlots[slotIndex].m_blockCount
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<< " m_recoveryCount: " << m_decoderSlots[slotIndex].m_recoveryCount;
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}
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}
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void RemoteInputBuffer::writeData(char *array)
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{
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RemoteSuperBlock *superBlock = (RemoteSuperBlock *) array;
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int frameIndex = superBlock->m_header.m_frameIndex;
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int decoderIndex = frameIndex % m_nbDecoderSlots;
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// frame break
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if (m_frameHead == -1) // initial state
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{
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m_decoderIndexHead = decoderIndex; // new decoder slot head
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m_frameHead = frameIndex;
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initReadIndex(); // reset read index
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initDecodeAllSlots(); // initialize all slots
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}
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else if (m_frameHead != frameIndex) // frame break => new frame starts
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{
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m_decoderIndexHead = decoderIndex; // new decoder slot head
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m_frameHead = frameIndex; // new frame head
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checkSlotData(decoderIndex); // check slot before re-init
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rwCorrectionEstimate(decoderIndex);
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m_nbWrites++;
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initDecodeSlot(decoderIndex); // collect stats and re-initialize current slot
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}
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// Block processing
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if (m_decoderSlots[decoderIndex].m_blockCount < RemoteNbOrginalBlocks) // not enough blocks to decode -> store data
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{
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int blockIndex = superBlock->m_header.m_blockIndex;
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int blockCount = m_decoderSlots[decoderIndex].m_blockCount;
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int recoveryCount = m_decoderSlots[decoderIndex].m_recoveryCount;
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m_decoderSlots[decoderIndex].m_cm256DescriptorBlocks[blockCount].Index = blockIndex;
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if (blockIndex == 0) // first block with meta
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{
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m_decoderSlots[decoderIndex].m_metaRetrieved = true;
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}
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if (blockIndex < RemoteNbOrginalBlocks) // original data
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{
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m_decoderSlots[decoderIndex].m_cm256DescriptorBlocks[blockCount].Block = (void *) storeOriginalBlock(decoderIndex, blockIndex, superBlock->m_protectedBlock);
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m_decoderSlots[decoderIndex].m_originalCount++;
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}
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else // recovery data
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{
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m_decoderSlots[decoderIndex].m_recoveryBlocks[recoveryCount] = superBlock->m_protectedBlock;
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m_decoderSlots[decoderIndex].m_cm256DescriptorBlocks[blockCount].Block = (void *) &m_decoderSlots[decoderIndex].m_recoveryBlocks[recoveryCount];
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m_decoderSlots[decoderIndex].m_recoveryCount++;
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}
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}
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m_decoderSlots[decoderIndex].m_blockCount++;
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if (m_decoderSlots[decoderIndex].m_blockCount == RemoteNbOrginalBlocks) // ready to decode
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{
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m_decoderSlots[decoderIndex].m_decoded = true;
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if (m_cm256_OK && (m_decoderSlots[decoderIndex].m_recoveryCount > 0)) // recovery data used => need to decode FEC
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{
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m_paramsCM256.BlockBytes = sizeof(RemoteProtectedBlock); // never changes
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m_paramsCM256.OriginalCount = RemoteNbOrginalBlocks; // never changes
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if (m_decoderSlots[decoderIndex].m_metaRetrieved) {
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m_paramsCM256.RecoveryCount = m_currentMeta.m_nbFECBlocks;
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} else {
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m_paramsCM256.RecoveryCount = m_decoderSlots[decoderIndex].m_recoveryCount;
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}
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if (m_cm256.cm256_decode(m_paramsCM256, m_decoderSlots[decoderIndex].m_cm256DescriptorBlocks)) // CM256 decode
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{
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qDebug() << "RemoteInputBuffer::writeData: decode CM256 error:"
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<< " decoderIndex: " << decoderIndex
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<< " m_blockCount: " << m_decoderSlots[decoderIndex].m_blockCount
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<< " m_originalCount: " << m_decoderSlots[decoderIndex].m_originalCount
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<< " m_recoveryCount: " << m_decoderSlots[decoderIndex].m_recoveryCount;
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}
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else
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{
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qDebug() << "RemoteInputBuffer::writeData: decode CM256 success:"
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<< " decoderIndex: " << decoderIndex
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<< " m_blockCount: " << m_decoderSlots[decoderIndex].m_blockCount
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<< " m_originalCount: " << m_decoderSlots[decoderIndex].m_originalCount
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<< " m_recoveryCount: " << m_decoderSlots[decoderIndex].m_recoveryCount;
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for (int ir = 0; ir < m_decoderSlots[decoderIndex].m_recoveryCount; ir++) // restore missing blocks
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{
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int recoveryIndex = RemoteNbOrginalBlocks - m_decoderSlots[decoderIndex].m_recoveryCount + ir;
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int blockIndex = m_decoderSlots[decoderIndex].m_cm256DescriptorBlocks[recoveryIndex].Index;
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RemoteProtectedBlock *recoveredBlock = (RemoteProtectedBlock *) m_decoderSlots[decoderIndex].m_cm256DescriptorBlocks[recoveryIndex].Block;
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if (blockIndex == 0) // first block with meta
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{
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RemoteMetaDataFEC *metaData = (RemoteMetaDataFEC *) recoveredBlock;
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boost::crc_32_type crc32;
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crc32.process_bytes(metaData, sizeof(RemoteMetaDataFEC)-4);
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if (crc32.checksum() == metaData->m_crc32)
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{
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m_decoderSlots[decoderIndex].m_metaRetrieved = true;
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printMeta("RemoteInputBuffer::writeData: recovered meta", metaData);
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}
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else
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{
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qDebug() << "RemoteInputBuffer::writeData: recovered meta: invalid CRC32";
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}
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}
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storeOriginalBlock(decoderIndex, blockIndex, *recoveredBlock);
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qDebug() << "RemoteInputBuffer::writeData: recovered block #" << blockIndex;
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} // restore missing blocks
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} // CM256 decode
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} // recovery
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if (m_decoderSlots[decoderIndex].m_metaRetrieved) // block zero with its meta data has been received
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{
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RemoteMetaDataFEC *metaData = getMetaData(decoderIndex);
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if (!(*metaData == m_currentMeta))
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{
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uint32_t sampleRate = metaData->m_sampleRate;
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if (sampleRate != 0)
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{
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setBufferLenSec(*metaData);
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m_balCorrLimit = sampleRate / 400; // +/- 5% correction max per read
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m_readNbBytes = (sampleRate * metaData->m_sampleBytes * 2) / 20;
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}
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printMeta("RemoteInputBuffer::writeData: new meta", metaData); // print for change other than timestamp
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}
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m_currentMeta = *metaData; // renew current meta
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} // check block 0
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} // decode
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}
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uint8_t *RemoteInputBuffer::readData(int32_t length)
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{
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uint8_t *buffer = (uint8_t *) m_frames;
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uint32_t readIndex = m_readIndex;
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m_nbReads++;
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// SEGFAULT FIX: arbitrarily truncate so that it does not exceed buffer length
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if (length > m_framesSize) {
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length = m_framesSize;
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}
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if (m_readIndex + length < m_framesNbBytes) // ends before buffer bound
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{
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m_readIndex += length;
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return &buffer[readIndex];
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}
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else if (m_readIndex + length == m_framesNbBytes) // ends at buffer bound
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{
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m_readIndex = 0;
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return &buffer[readIndex];
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}
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else // ends after buffer bound
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{
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if (length > m_readSize) // reallocate composition buffer if necessary
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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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m_readSize = length;
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}
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if (m_readBuffer)
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{
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std::memcpy((void *) m_readBuffer, (const void *) &buffer[m_readIndex], m_framesNbBytes - m_readIndex); // copy end of buffer
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length -= m_framesNbBytes - m_readIndex;
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std::memcpy((void *) &m_readBuffer[m_framesNbBytes - m_readIndex], (const void *) buffer, length); // copy start of buffer
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m_readIndex = length;
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}
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return m_readBuffer;
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}
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}
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void RemoteInputBuffer::printMeta(const QString& header, RemoteMetaDataFEC *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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<< ":" << (int) metaData->m_nbOriginalBlocks
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<< ":" << (int) metaData->m_nbFECBlocks
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<< "|" << metaData->m_deviceIndex
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<< ":" << metaData->m_channelIndex
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<< "|" << metaData->m_tv_sec
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<< ":" << metaData->m_tv_usec
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<< "|";
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}
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