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SSB_HighSpeed_Modem
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SSB_HighSpeed_Modem/hsmodem/hsmodem.cpp

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/*
* High Speed modem to transfer data in a 2,7kHz SSB channel
* =========================================================
* Author: DJ0ABR
* made for: AMSAT-DL
*
* (c) DJ0ABR
* www.dj0abr.de
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* this is a console program
* it can be compiled under Linux: make
* and under Windows: Visual-Studio
*
* !!! compile x86 (32bit) version !!! all supplied dlls are 32 bit !!!
* ====================================================================
*
*/
#include "hsmodem.h"
void bc_rxdata(uint8_t* pdata, int len, struct sockaddr_in* rxsock);
void appdata_rxdata(uint8_t* pdata, int len, struct sockaddr_in* rxsock);
void startModem();
// threads will exit if set to 0
int keeprunning = 1;
// UDP I/O
int BC_sock_AppToModem = -1;
int DATA_sock_AppToModem = -1;
int DATA_sock_ExtToModem = -1;
int UdpBCport_AppToModem = 40131; // broadcast messages from GUI
int UdpDataPort_AppToModem = 40132; // data messages from GUI
int UdpDataPort_ModemToApp = 40133; // all messages to GUI
int TcpDataPort_WebSocket = 40134; // web socket data exchange to local browser
int UdpDataPort_ExtWebdata = 40135; // get data from ext. application to sent via modem
// op mode depending values
// default mode if not set by the app
int speedmode = 4;
int set_speedmode = 4;
int bitsPerSymbol = 2; // QPSK=2, 8PSK=3
int constellationSize = 4; // QPSK=4, 8PSK=8
char localIP[] = { "127.0.0.1" };
char ownfilename[] = { "hsmodem" };
char appIP[20] = { 0 };
int fixappIP = 0;
int restart_modems = 0;
int init_voice = 0;
int trigger_resetmodem = 0;
char homepath[1000] = { 0 };
int caprate = 44100;
int txinterpolfactor = 20;
int rxPreInterpolfactor = 5;
int linespeed = 4410;
char captureDeviceName[101] = { 0 };
char playbackDeviceName[101] = { 0 };
char micDeviceName[101] = { 0 };
char lsDeviceName[101] = { 0 };
int announcement = 0;
int VoiceAudioMode = VOICEMODE_OFF;
int codec = 1; // 0=opus, 1=codec2
int tuning = 0;
int marker = 1;
int init_voice_result = 0;
// number of audio device in libkmaudio
int io_capidx = -1;
int io_pbidx = -1;
int voice_capidx = -1;
int voice_pbidx = -1;
int sendIntro = 0;
int extData_active = 0;
char mycallsign[21];
char myqthloc[11];
char myname[21];
int main(int argc, char* argv[])
{
int opt = 0;
char* modemip = NULL;
#ifdef _LINUX_
while ((opt = getopt(argc, argv, "m:")) != -1)
{
switch (opt)
{
case 'm':
// specify IP of application: hsmodem -m 192.168.0.1
modemip = optarg;
memset(appIP, 0, 20);
int len = strlen(modemip);
if (len < 16)
{
memcpy(appIP, modemip, len);
fixappIP = 1;
printf("Application IP set to: %s\n", modemip);
}
else
{
printf("invalid Application IP: %s\n", modemip);
exit(0);
}
break;
}
}
if (isRunning(ownfilename) == 1)
exit(0);
install_signal_handler();
#endif
#ifdef _WIN32_
if (argc != 1 && argc != 3)
{
printf("invalid argument\n");
exit(0);
}
if (argc == 3)
{
memset(appIP, 0, 20);
int len = strlen(argv[2]);
if (len < 16)
{
memcpy(appIP, argv[2], len);
fixappIP = 1;
printf("Application IP set to: %s\n", argv[2]);
}
else
{
printf("invalid Application IP: %s\n", modemip);
exit(0);
}
}
#endif
// get user home path
#ifdef _WIN32_
strcpy(homepath, getenv("USERPROFILE"));
char nd[1000];
sprintf(nd, "%s/oscardata", homepath);
if (CreateDirectory(nd, NULL) || ERROR_ALREADY_EXISTS == GetLastError())
{
sprintf(nd, "%s\\oscardata\\intro", homepath);
CreateDirectory(nd, NULL);
}
#endif
#ifdef _LINUX_
char* ph;
if ((ph = getenv("HOME")) == NULL)
{
ph = getpwuid(getuid())->pw_dir;
}
if (ph != NULL)
strcpy(homepath, ph);
else
*homepath = 0;
struct stat st = { 0 };
char nd[1100];
sprintf(nd, "%s/oscardata", homepath);
if (stat(nd, &st) == -1)
{
mkdir(nd, 0755);
sprintf(nd, "%s/oscardata/intro", homepath);
if (stat(nd, &st) == -1)
mkdir(nd, 0755);
}
#endif
printf("user home path:<%s>\n", homepath);
init_fifos(); // init fifos for PSK data and RTTY characters
init_distributor(); // init distribution process for PSK data
init_tune(); // init tuning tones (mixed to signal)
kmaudio_init(); // init soundcard driver
kmaudio_getDeviceList();// get sound devices
init_packer(); // init PSK packer/unpacker
initFEC(); // init FEC calculator
ws_init(); // init Websocket
// start udp RX to listen for broadcast search message from Application
UdpRxInit(&BC_sock_AppToModem, UdpBCport_AppToModem, &bc_rxdata, &keeprunning);
// start udp RX for data from application
UdpRxInit(&DATA_sock_AppToModem, UdpDataPort_AppToModem, &appdata_rxdata, &keeprunning);
// start udp RX to listen for data from external program
// these data will be sent via QO100 (i.e.: to the receiver's websocket)
UdpRxInit(&DATA_sock_ExtToModem, UdpDataPort_ExtWebdata, &ext_rxdata, &keeprunning);
printf("QO100modem initialised and running\n");
while (keeprunning)
{
int wait = 1;
if (restart_modems == 1)
{
printf("restart modem requested\n");
startModem();
restart_modems = 0;
}
if (init_voice == 1)
{
initVoice();
init_voice = 0;
}
//doArraySend();
if (VoiceAudioMode == VOICEMODE_INTERNALLOOP)
{
// loop voice mic to LS
float f[1100]; // 1.1 x need rate to have reserve for resampler
int anz = kmaudio_readsamples(voice_capidx, f, 1000, micvol, 0);
if (anz > 0)
kmaudio_playsamples(voice_pbidx, f, anz,lsvol);
}
if (VoiceAudioMode == VOICEMODE_RECORD)
{
// loop voice mic to LS, and record into PCM file
float f[1100];
while (keeprunning)
{
int anz = kmaudio_readsamples(voice_capidx, f, 1000, micvol,0);
if (anz > 0)
{
io_saveStream(f, anz);
kmaudio_playsamples(voice_pbidx, f, anz,lsvol);
}
else
break;
}
}
if (VoiceAudioMode == VOICEMODE_PLAYBACK)
{
playIntro();
VoiceAudioMode = VOICEMODE_OFF;
}
if (VoiceAudioMode == VOICEMODE_CODECLOOP || VoiceAudioMode == VOICEMODE_DV_FULLDUPLEX)
{
// send mic to codec
float f;
while(kmaudio_readsamples(voice_capidx, &f, 1, micvol,0))
//while (io_mic_read_fifo(&f))
{
encode(f);
}
}
if (tuning != 0)
{
do_tuning(tuning);
wait = 0;
}
if (speedmode == 10)
{
// nothing to do here
//testall();
//fmtest();
}
else
{
#ifdef _LINUX_
/*static uint64_t old_tm = 0;
uint64_t tm = getms();
if (tm >= (old_tm + 1000))
{
// read Audio device list every 1s
// runtime dectection currently works under linux only
kmaudio_getDeviceList();
old_tm = tm;
}*/
#endif
// demodulate incoming audio data stream
int dret = demodulator();
if (dret) wait = 0;
}
if (wait) sleep_ms(10);
}
printf("stopped: %d\n", keeprunning);
#ifdef _LINUX_
close(BC_sock_AppToModem);
#endif
#ifdef _WIN32_
closesocket(BC_sock_AppToModem);
#endif
return 0;
}
typedef struct {
int audio;
int tx;
int rx;
int bpsym;
int linespeed;
int codecrate;
} SPEEDRATE;
// AudioRate, TX-Resampler, RX-Resampler/4, bit/symbol, Codec-Rate
#define NUMSPEEDMODES 11
SPEEDRATE sr[NUMSPEEDMODES] = {
// BPSK modes
{48000, 40,10, 1, 1200, 800},
{48000, 20, 5, 1, 2400, 2000},
// QPSK modes
{48000, 32, 8, 2, 3000, 2400},
{48000, 24, 6, 2, 4000, 3200},
{44100, 20, 5, 2, 4410, 3600},
{48000, 20, 5, 2, 4800, 4000},
// 8PSK modes
{44100, 24, 6, 3, 5500, 4400},
{48000, 24, 6, 3, 6000, 4800},
{44100, 20, 5, 3, 6600, 5200},
{48000, 20, 5, 3, 7200, 6000},
// RTTY
{48000, 0, 0, 0, 0, 0},
};
void startModem()
{
printf("startModem. Speedmode:%d\n",set_speedmode);
close_rtty();
fifo_clear(PSK_GUI_TX);
close_dsp();
speedmode = set_speedmode;
if (speedmode < 0 || speedmode >= NUMSPEEDMODES)
speedmode = 4;
bitsPerSymbol = sr[speedmode].bpsym;
constellationSize = (1 << bitsPerSymbol); // QPSK=4, 8PSK=8
caprate = sr[speedmode].audio;
txinterpolfactor = sr[speedmode].tx;
rxPreInterpolfactor = sr[speedmode].rx;
linespeed = sr[speedmode].linespeed;
opusbitrate = sr[speedmode].codecrate;
_init_fft();
if (speedmode < 10)
{
init_dsp();
}
if (speedmode == 10)
{
rtty_txoff = 1;
init_rtty();
}
// int TX audio and modulator
io_capidx = kmaudio_startCapture(captureDeviceName, caprate);
if (io_capidx == -1)
{
printf("CAP: cannot open device: %s\n", captureDeviceName);
return;
}
io_pbidx = kmaudio_startPlayback(playbackDeviceName, caprate);
if (io_pbidx == -1)
{
printf("PB: cannot open device: %s\n", playbackDeviceName);
return;
}
init_tune();
}
void initVoice()
{
// init voice audio
if (VoiceAudioMode == VOICEMODE_OFF)
{
float f = 0.0f;
io_saveStream(&f, 1); // close recording
close_voiceproc();
close_stream(voice_capidx);
close_stream(voice_pbidx);
}
else
{
int srate = VOICE_SAMPRATE;
// voice always runs with 48000 with one exception:
// if it is used for monitoring only and the digital audio
// stream runs with 44100, then also the monitoring voice audio
// must runs with 44100
if (VoiceAudioMode == VOICEMODE_LISTENAUDIOIN && caprate == 44100)
srate = 44100;
voice_capidx = kmaudio_startCapture(micDeviceName, srate);
if (voice_capidx == -1)
{
printf("Voice CAP: cannot open device: %s\n", micDeviceName);
return;
}
voice_pbidx = kmaudio_startPlayback(lsDeviceName, srate);
if (voice_pbidx == -1)
{
printf("Voice PB: cannot open device: %s\n", lsDeviceName);
return;
}
init_voiceproc();
}
}
// called from UDP callback
void setSpeedmode(int spm)
{
printf("set speedmode:%d\n", spm);
set_speedmode = spm;
restart_modems = 1;
transmissions = 1000; // announcement at next TX
}
void io_setAudioDevices(uint8_t pbvol, uint8_t capvol, uint8_t announce, uint8_t pbls, uint8_t pbmic, char *pbname, char*capname)
{
io_setPBvolume(pbvol);
io_setCAPvolume(capvol);
io_setLSvolume(pbls);
io_setMICvolume(pbmic);
announcement = announce;
if (strcmp(pbname, playbackDeviceName) || strcmp(captureDeviceName,capname))
{
restart_modems = 1;
snprintf(playbackDeviceName, 100, "%s", pbname);
playbackDeviceName[99] = 0;
snprintf(captureDeviceName, 100, "%s", capname);
captureDeviceName[99] = 0;
}
}
uint8_t *getDevList(int* plen)
{
uint8_t* txdata = io_getAudioDevicelist(plen);
txdata[0] = 3; // ID of this UDP message
txdata[1] = (io_capidx != -1 && devlist[io_capidx].working) ? '1' : '0';
txdata[2] = (io_pbidx != -1 && devlist[io_pbidx].working) ? '1' : '0';
txdata[3] = (voice_capidx != -1 && devlist[voice_capidx].working) ? '1' : '0';
txdata[4] = (voice_pbidx != -1 && devlist[voice_pbidx].working) ? '1' : '0';
return txdata;
}
// called from UDP RX thread for Broadcast-search from App
void bc_rxdata(uint8_t* pdata, int len, struct sockaddr_in* rxsock)
{
static uint64_t lastms = 0; // time of last received BC message
uint64_t actms = getms();
if (len > 0 && pdata[0] == 0x3c)
{
/* searchmodem message received
* Format:
* Byte :
* 0 ... 0x3c
* 1 ... PB volume
* 2 ... CAP volume
* 3 ... announcement on / off, duration
* 4 ... DV loudspeaker volume
* 5 ... DV mic volume
* 6 ... safe mode number
* 7 ... send Intro
* 8 ... rtty autosync
* 9 ... hsmodem speed mode
* 10 .. external data IF on/off
* 11-19 ... unused
* 20 .. 119 ... PB device name
* 120 .. 219 ... CAP device name
* 220 .. 239 ... Callsign
* 230 .. 249 ... qthloc
* 250 .. 269 ... Name
*/
char rxip[20];
strcpy(rxip, inet_ntoa(rxsock->sin_addr));
//printf("GUI search received:%s\n",rxip);
if (fixappIP == 0)
{
if (strcmp(appIP, rxip))
{
if (appIP[0] != 0)
{
// there was an appIP already
// before accepting this new one, wait 3 seconds
int ts = (int)(actms - lastms);
//printf("new app IP: %s since %d, restarting modems\n", rxip,ts);
if (ts < 3000)
return;
}
//printf("first app IP: %s, restarting modems\n", rxip);
restart_modems = 1;
}
strcpy(appIP, rxip);
//printf("app (%s) is searching modem. Sending modem IP to the app\n",appIP);
// App searches for the modem IP, mirror the received messages
// so the app gets an UDP message with this local IP
int alen;
uint8_t* txdata = getDevList(&alen);
sendUDP(appIP, UdpDataPort_ModemToApp, txdata, alen);
}
else
{
// appIP is fixed, answer only to this IP
if (!strcmp(appIP, rxip))
{
//printf("app (%s) is searching modem. Sending modem IP to the app\n",appIP);
// App searches for the modem IP, mirror the received messages
// so the app gets an UDP message with this local IP
int alen;
uint8_t* txdata = getDevList(&alen);
sendUDP(appIP, UdpDataPort_ModemToApp, txdata, alen);
}
else
return;
}
memcpy(mycallsign, pdata + 220, sizeof(mycallsign));
mycallsign[sizeof(mycallsign) - 1] = 0;
memcpy(myqthloc, pdata + 240, sizeof(myqthloc));
myqthloc[sizeof(myqthloc) - 1] = 0;
memcpy(myname, pdata + 250, sizeof(myname));
myname[sizeof(myname) - 1] = 0;
if(pdata[9] != 255 && set_speedmode != pdata[9])
setSpeedmode(pdata[9]);
//printf("<%s> <%s> <%s>\n", mycallsign, myqthloc, myname);
//printf("%d %d %d %d %d %d %d \n",pdata[1], pdata[2], pdata[3], pdata[4], pdata[5], pdata[6], pdata[7]);
io_setAudioDevices(pdata[1], pdata[2], pdata[3], pdata[4], pdata[5], (char*)(pdata + 20), (char*)(pdata + 120));
sendIntro = pdata[7];
rtty_autosync = pdata[8];
if (extData_active == 0 && pdata[10] == 1)
printf("ext.Data activated\n");
else if (extData_active == 1 && pdata[10] == 0)
printf("ext.Data deactivated\n");
extData_active = pdata[10];
lastms = actms;
}
}
// called by UDP RX thread for data from App
void appdata_rxdata(uint8_t* pdata, int len, struct sockaddr_in* rxsock)
{
// ignore data when modem is starting
if (restart_modems == 1) return;
uint8_t type = pdata[0];
uint8_t minfo = pdata[1];
//printf("from GUI: %d %d\n", pdata[0], pdata[1]);
// type values: see oscardata config.cs: frame types
if (type == 16)
{
// a bulletin file from the GUI
// has to be sent to webbrowsers via websocket
//printf("Bulletin contents:\n<%s>\n", pdata + 1);
// the first byte (16) is used as the external type specifier
ws_send(pdata, len);
return;
}
if (type == 17)
{
// auto send file
// TODO
// for testing only:
// simulate sending a text file with 1kB length
/*int testlen = 100000;
uint8_t arr[100000];
char c = 'A';
for (int i = 0; i < testlen; i++)
{
arr[i] = c;
if (++c > 'Z') c = 'A';
}
arraySend(arr, testlen, 3, (char*)"testfile.txt");*/
return;
}
if (type == 18)
{
// auto send folder
// TODO
}
if (type == 19)
{
// shut down this modem PC
#ifdef _LINUX_
int r = system("sudo shutdown now");
exit(r);
#endif
}
if (type == 20)
{
// reset liquid RX modem
tuning = 0;
resetModem();
//io_clear_audio_fifos();
io_fifo_clear(voice_pbidx);
io_fifo_clear(voice_capidx);
return;
}
if (type == 21)
{
// set playback volume (in % 0..100)
io_setPBvolume(minfo);
return;
}
if (type == 22)
{
// set capture volume (in % 0..100)
io_setCAPvolume(minfo);
return;
}
if (type == 23)
{
// set playback volume (in % 0..100)
io_setLSvolume(minfo);
return;
}
if (type == 24)
{
// set capture volume (in % 0..100)
io_setMICvolume(minfo);
return;
}
if (type == 25)
{
/*
* Format:
* 0 ... statics.SetVoiceMode (25)
* 1 ... voicemode
* 2 ... codec
* 3-102 ... LS device name
* 103-202 ... MIC device name
*/
memcpy(lsDeviceName, pdata + 3, 100);
lsDeviceName[99] = 0;
memcpy(micDeviceName, pdata + 103, 100);
micDeviceName[99] = 0;
VoiceAudioMode = pdata[1];
codec = pdata[2];
//printf("LS:<%s> MIC:<%s> Mode:%d codec:%d\n", lsDeviceName, micDeviceName, VoiceAudioMode, codec);
init_voice = 1;
if (!strcmp(micDeviceName, captureDeviceName))
{
printf("capture device already in use, ignoring: %s\n", micDeviceName);
init_voice = 0;
}
if (!strcmp(lsDeviceName, playbackDeviceName))
{
printf("playback device already in use, ignoring: %s\n", lsDeviceName);
init_voice = 0;
}
return;
}
if (type == 26)
{
// GUI requests termination of this hsmodem
printf("shut down hsmodem\n");
closeAllandTerminate();
return;
}
if (type == 27)
{
// send Tuning tones
printf("Tuning mode active:%d\n",minfo);
tuning_runtime = 0;
tuning = minfo;
return;
}
if (type == 28)
{
printf("marker:%d\n",minfo);
marker = minfo;
return;
}
if (speedmode == 10)
{
// rtty commands
if (type == 29)
{
int16_t freq = pdata[1];
freq <<= 8;
freq += pdata[2];
printf("set freq:%d\n", freq);
rtty_modifyRXfreq(freq);
return;
}
if (type == 30)
{
// rtty key pressed
write_fifo(FIFO_RTTYTX,&minfo,1);
return;
}
if (type == 31)
{
// rtty string
int len = pdata[1];
len <<= 8;
len += pdata[2];
len++; // the first toTX command
//printf("hsmodem.cpp rtty_tx_write_fifo: ");
write_fifo(FIFO_RTTYTX, pdata+3,len);
/*for (int i = 0; i < len; i++)
{
//printf("%c", pdata[3 + i]);
write_fifo(FIFO_RTTYTX, pdata[3 + i]);
}*/
//printf("\n");
return;
}
if (type == 32)
{
// TX on/off, but send buffer
rtty_txoff = minfo?0:1;
return;
}
if (type == 33)
{
// stop TX immediately
rtty_txoff = 1;
fifo_clear(FIFO_RTTYTX);
}
}
if (type >= 29 && type <= 32) return;
if (speedmode == 10) return;
// here we are with payload data to be sent via the modulator
if (len != (PAYLOADLEN + 2))
{
printf("data from app: wrong length:%d (should be %d)\n", len - 2, PAYLOADLEN);
return;
}
//if (getSending() == 1) return; // already sending (Array sending)
// send a payload
if (minfo == 0 || minfo == 3)
{
// this is the first frame of a larger file
sendAnnouncement();
toGR_sendData(pdata + 2, type, minfo, 5); // repeat the first frame a couple of times
sendStationInfo();
}
else if ((len - 2) < PAYLOADLEN)
{
// if not enough data for a full payload add Zeros
uint8_t payload[PAYLOADLEN];
memset(payload, 0, PAYLOADLEN);
memcpy(payload, pdata + 2, len - 2);
if (minfo == 2) // if its the last frame, repeate a couple of times
toGR_sendData(payload, type, minfo, 5);
else
toGR_sendData(payload, type, minfo, 0); // send only once
}
else
{
// normal sending: continous or last frame
if (minfo == 2) // if its the last frame, repeate a couple of times
toGR_sendData(pdata + 2, type, minfo, 5);
else
toGR_sendData(pdata + 2, type, minfo, 0);
}
}
// pack and send PSK data
void toGR_sendData(uint8_t* data, int type, int status, int repeat)
{
modem_sendPSKData(data, type, status, repeat, PSK_GUI_TX);
}
// pack and send PSK data
// handle repetitions and check if TX was down
// repeat: 0=do not repeat, 1=repeat if currently not sending, >1 = number of repetitions
void modem_sendPSKData(uint8_t* data, int type, int status, int repeat, int fifoID)
{
// send the first frame normal (with a new frame counter value)
int len = 0;
uint8_t* txdata = Pack(data, type, status, &len, 0);
if (txdata != NULL)
{
sendPSKdata(txdata, len, fifoID);
}
if (repeat == 0) return;
// now check if repetitions are required
if (bitsPerSymbol == 0 || txinterpolfactor == 0) return; // just for security, no useful function
int repetitions = 6 * ((caprate / txinterpolfactor) * bitsPerSymbol / 8) / 258 + 1;
if (isPlaying(io_pbidx) == 0) // if not sending, repeat frame
{
if (repeat == 1)
repeat = repetitions;
else if (repeat > 1)
{
// if TX was down, do at least "repetitions" repetitions
if (repeat < repetitions) repeat = repetitions;
}
}
// and the rest repeated if requested
txdata = Pack(data, type, status, &len, 1);
for (int i = 0; i < repeat; i++)
{
if (txdata != NULL) sendPSKdata(txdata, len, fifoID);
}
}
void sendStationInfo()
{
uint8_t payload[PAYLOADLEN];
memcpy(payload, mycallsign, 20);
memcpy(payload+20, myqthloc, 10);
memcpy(payload+30, myname, 20);
int len = 0;
uint8_t* txdata = Pack(payload, 7, 1, &len, 1);
//showbytestring((char *)"TX Userinfo: ", txdata, len);
for (int i = 0; i < 2; i++)
{
if (txdata != NULL) sendPSKdata(txdata, len, PSK_GUI_TX);
}
}
// called by liquid demodulator for received data
void GRdata_rxdata(uint8_t* pdata, int len, struct sockaddr_in* rxsock)
{
static int64_t lasttime = -1;
static uint64_t triggertime = 0;
// raw symbols
uint8_t* pl = unpack_data(pdata, len);
if (pl != NULL)
{
// complete frame received
//printf("type:%d\n", pl[0]);
if (pl[0] == 8)
{
// external data received
ext_modemRX(pl);
}
// send payload to app
uint8_t txpl[PAYLOADLEN + 10 + 1];
memcpy(txpl + 1, pl, PAYLOADLEN + 10);
txpl[0] = 1; // type 1: payload data follows
sendUDP(appIP, UdpDataPort_ModemToApp, txpl, PAYLOADLEN + 10 + 1);
if (VoiceAudioMode == VOICEMODE_DV_FULLDUPLEX)
{
// send to Codec decoder
if (*(pl + 3) != 0) // minfo=0 ... just a filler, ignore
toCodecDecoder(pl + 10, PAYLOADLEN);
}
trigger_resetmodem = 0;
rx_in_sync = 1;
lasttime = getms();
}
else
{
// no frame found
// if longer ws seconds nothing found, reset liquid RX modem
// comes here with symbol rate, i.e. 4000 S/s
int bps = sr[speedmode].linespeed;
// time for one frame [ms]
int frmlen = UDPBLOCKLEN * 8;
int tmfrm_ms = (frmlen * 1000) / bps; // ms for one frame
uint64_t acttm = getms();
if (lasttime == -1)
{
lasttime = acttm;
return;
}
int tdiff = (int)(acttm - lasttime); // elapsed time in ms
int elapsed_frames = tdiff / tmfrm_ms;
//if((tdiff%1000)==0) printf("elapsed time:%d frames:%d\n", tdiff, elapsed_frames);
if (trigger_resetmodem == 1)
{
// reset requested by FFT level detector
trigger_resetmodem = 2;
//printf("set triggertime\n");
triggertime = acttm;
}
if ((acttm - triggertime) > 1000 && trigger_resetmodem == 2)
{
// reset rx 1 second after level detection
//printf("reset RX modem, 1s since signal detection\n");
trigger_resetmodem = 0;
rx_in_sync = 0;
resetModem();
lasttime = acttm;
}
if (tdiff > 5000)
{
// in any case, only every 5s or longer
//printf("5s elapsed\n");
if (elapsed_frames > 2)
{
// reset modem if more than 2 frames have not been received
trigger_resetmodem = 0;
rx_in_sync = 0;
if (speedmode < 10)
{
//printf("no signal detected, reset RX modem\n");
resetModem();
}
lasttime = acttm;
}
}
if (elapsed_frames > 5)
{
// if > 5 frames not recieved, mark "not in sync"
rx_in_sync = 0;
}
}
}
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