138 lines
3.1 KiB
C++
138 lines
3.1 KiB
C++
/*
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* Copyright (C) 2018 by Jonathan Naylor G4KLX
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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; either version 2 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 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "DelayBuffer.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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CDelayBuffer::CDelayBuffer(const std::string& name, unsigned int blockSize, unsigned int blockTime, unsigned int jitterTime, bool debug) :
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m_name(name),
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m_blockSize(blockSize),
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m_blockTime(blockTime),
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m_debug(debug),
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m_timer(1000U, 0U, jitterTime),
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m_stopWatch(),
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m_running(false),
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m_buffer(1000U, name.c_str()),
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m_outputCount(0U),
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m_lastData(NULL),
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m_lastDataLength(0U)
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{
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assert(blockSize > 0U);
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assert(blockTime > 0U);
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assert(jitterTime > 0U);
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m_lastData = new unsigned char[m_blockSize];
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reset();
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}
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CDelayBuffer::~CDelayBuffer()
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{
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delete[] m_lastData;
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}
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bool CDelayBuffer::addData(const unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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assert(length > 0U);
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assert(length == m_blockSize);
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if (m_debug)
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LogDebug("%s, DelayBuffer: appending data", m_name.c_str());
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m_buffer.addData(data, length);
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if (!m_timer.isRunning()) {
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LogDebug("%s, DelayBuffer: starting the timer from append", m_name.c_str());
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m_timer.start();
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}
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return true;
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}
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B_STATUS CDelayBuffer::getData(unsigned char* data, unsigned int& length)
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{
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assert(data != NULL);
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if (!m_running)
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return BS_NO_DATA;
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unsigned int needed = m_stopWatch.elapsed() / m_blockTime + 2U;
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if (needed <= m_outputCount)
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return BS_NO_DATA;
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if (!m_buffer.isEmpty()) {
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if (m_debug)
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LogDebug("%s, DelayBuffer: returning data, elapsed=%ums", m_name.c_str(), m_stopWatch.elapsed());
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length = m_buffer.getData(data, m_blockSize);
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// Save this data in case no more data is available next time
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::memcpy(m_lastData, data, length);
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m_lastDataLength = length;
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m_outputCount++;
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return BS_DATA;
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}
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LogDebug("%s, DelayBuffer: no data available, elapsed=%ums", m_name.c_str(), m_stopWatch.elapsed());
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// Return the last data frame if we have it
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if (m_lastDataLength > 0U) {
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LogDebug("%s, DelayBuffer: returning the last received frame", m_name.c_str());
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::memcpy(data, m_lastData, m_lastDataLength);
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length = m_lastDataLength;
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m_outputCount++;
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return BS_MISSING;
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}
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return BS_NO_DATA;
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}
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void CDelayBuffer::reset()
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{
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m_buffer.clear();
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m_lastDataLength = 0U;
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m_outputCount = 0U;
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m_timer.stop();
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m_running = false;
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}
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void CDelayBuffer::clock(unsigned int ms)
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{
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m_timer.clock(ms);
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if (m_timer.isRunning() && m_timer.hasExpired()) {
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if (!m_running) {
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m_stopWatch.start();
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m_running = true;
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}
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}
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}
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