MMDVMHost-Private/YSFControl.cpp

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/*
* Copyright (C) 2015,2016 Jonathan Naylor, G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "YSFControl.h"
#include "YSFFICH.h"
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#include "Utils.h"
#include "Sync.h"
#include "Log.h"
#include <cassert>
#include <ctime>
// #define DUMP_YSF
/*
* TODO:
* AMBE FEC reconstruction.
* Callsign extraction + late entry.
* Uplink and downlink callsign addition.
*/
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CYSFControl::CYSFControl(const std::string& callsign, IDisplay* display, unsigned int timeout, bool duplex, bool parrot) :
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m_display(display),
m_duplex(duplex),
m_queue(1000U, "YSF Control"),
m_state(RS_RF_LISTENING),
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m_timeoutTimer(1000U, timeout),
m_frames(0U),
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m_parrot(NULL),
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m_fp(NULL)
{
assert(display != NULL);
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if (parrot)
m_parrot = new CYSFParrot(timeout);
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}
CYSFControl::~CYSFControl()
{
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delete m_parrot;
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}
bool CYSFControl::writeModem(unsigned char *data)
{
unsigned char type = data[0U];
if (type == TAG_LOST && m_state == RS_RF_AUDIO) {
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LogMessage("YSF, transmission lost, %.1f seconds", float(m_frames) / 10.0F);
if (m_parrot != NULL)
m_parrot->end();
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writeEndOfTransmission();
return false;
}
if (type == TAG_LOST)
return false;
bool valid = (data[1U] & YSF_CKSUM_OK) == YSF_CKSUM_OK;
unsigned char fi = data[1U] & YSF_FI_MASK;
unsigned char dt = data[1U] & YSF_DT_MASK;
if (type == TAG_DATA && valid && m_state == RS_RF_LISTENING) {
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m_frames = 0U;
m_timeoutTimer.start();
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m_display->writeFusion("XXXXXX");
m_state = RS_RF_AUDIO;
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LogMessage("YSF, received RF header");
#if defined(DUMP_YSF)
openFile();
#endif
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}
if (m_state != RS_RF_AUDIO)
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return false;
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if (type == TAG_EOT) {
CSync::addYSFSync(data + 2U);
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CYSFFICH fich;
fich.decode(data + 2U);
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m_frames++;
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if (m_duplex) {
fich.setMR(YSF_MR_BUSY);
fich.encode(data + 2U);
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data[0U] = TAG_EOT;
data[1U] = 0x00U;
writeQueue(data);
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}
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if (m_parrot != NULL) {
fich.setMR(YSF_MR_NOT_BUSY);
fich.encode(data + 2U);
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data[0U] = TAG_EOT;
data[1U] = 0x00U;
writeParrot(data);
}
#if defined(DUMP_YSF)
writeFile(data + 2U);
#endif
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LogMessage("YSF, received RF end of transmission, %.1f seconds", float(m_frames) / 10.0F);
writeEndOfTransmission();
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return false;
} else {
CSync::addYSFSync(data + 2U);
CYSFFICH fich;
fich.decode(data + 2U);
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m_frames++;
if (m_duplex) {
fich.setMR(YSF_MR_BUSY);
fich.encode(data + 2U);
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data[0U] = TAG_DATA;
data[1U] = 0x00U;
writeQueue(data);
}
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if (m_parrot != NULL) {
fich.setMR(YSF_MR_NOT_BUSY);
fich.encode(data + 2U);
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data[0U] = TAG_DATA;
data[1U] = 0x00U;
writeParrot(data);
}
#if defined(DUMP_YSF)
writeFile(data + 2U);
#endif
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}
return true;
}
unsigned int CYSFControl::readModem(unsigned char* data)
{
if (m_queue.isEmpty())
return 0U;
unsigned char len = 0U;
m_queue.getData(&len, 1U);
m_queue.getData(data, len);
return len;
}
void CYSFControl::writeEndOfTransmission()
{
m_state = RS_RF_LISTENING;
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m_timeoutTimer.stop();
m_display->clearFusion();
#if defined(DUMP_YSF)
closeFile();
#endif
}
void CYSFControl::clock(unsigned int ms)
{
m_timeoutTimer.clock(ms);
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if (m_parrot != NULL) {
m_parrot->clock(ms);
unsigned int space = m_queue.freeSpace();
bool hasData = m_parrot->hasData();
if (space > (YSF_FRAME_LENGTH_BYTES + 2U) && hasData) {
unsigned char data[YSF_FRAME_LENGTH_BYTES + 2U];
m_parrot->read(data);
writeQueue(data);
}
}
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}
void CYSFControl::writeQueue(const unsigned char *data)
{
assert(data != NULL);
if (m_timeoutTimer.isRunning() && m_timeoutTimer.hasExpired())
return;
unsigned char len = YSF_FRAME_LENGTH_BYTES + 2U;
m_queue.addData(&len, 1U);
m_queue.addData(data, len);
}
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void CYSFControl::writeParrot(const unsigned char *data)
{
assert(data != NULL);
if (m_timeoutTimer.isRunning() && m_timeoutTimer.hasExpired())
return;
m_parrot->write(data);
if (data[0U] == TAG_EOT)
m_parrot->end();
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}
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bool CYSFControl::openFile()
{
if (m_fp != NULL)
return true;
time_t t;
::time(&t);
struct tm* tm = ::localtime(&t);
char name[100U];
::sprintf(name, "YSF_%04d%02d%02d_%02d%02d%02d.ambe", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
m_fp = ::fopen(name, "wb");
if (m_fp == NULL)
return false;
::fwrite("YSF", 1U, 3U, m_fp);
return true;
}
bool CYSFControl::writeFile(const unsigned char* data)
{
if (m_fp == NULL)
return false;
::fwrite(data, 1U, YSF_FRAME_LENGTH_BYTES, m_fp);
return true;
}
void CYSFControl::closeFile()
{
if (m_fp != NULL) {
::fclose(m_fp);
m_fp = NULL;
}
}