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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
*
* 3rd party libraries:
* 1) BASS Audio from https://www.un4seen.com/
copy bass.h and bass.lib into source directory
Windows: copy bass.dll into executable directory
Linux: copy libbass.so into shared-lib folder, usually /usr/local/lib
! NOTE: for PC-Linux and ARM-Linux you need different libraries !
2) liquid-DSP
Linux Install Script:
this installs it from source
sudo apt install git autoconf libsndfile-dev libasound-dev
git clone git://github.com/jgaeddert/liquid-dsp.git
cd liquid-dsp
./bootstrap.sh
./configure
make -j 8
sudo make install
sudo ldconfig
a working copy of the source code is in ../3rdParty/liquid-dsp
to use this source simply remove the "git clone" line from above script
it installs libliquid.so into /usr/local/lib (Ubuntu) and
liquid.h into /usr/local/include/liquid/
Windows:
ready libraries are in ../3rdParty/liquid-dsp-windows
copy liquid.h and liquid.lib into source directory
copy liquid.dll into executable directory
*/
#include "hsmodem.h"
void toGR_sendData(uint8_t* data, int type, int status);
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_from_GR = -1;
int DATA_sock_FFT_from_GR = -1;
int DATA_sock_I_Q_from_GR = -1;
int UdpBCport_AppToModem = 40131;
int UdpDataPort_AppToModem = 40132;
int UdpDataPort_ModemToApp = 40133;
// op mode depending values
// default mode if not set by the app
int speedmode = 2;
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 caprate = 44100;
int txinterpolfactor = 20;
int rxPreInterpolfactor = 5;
int linespeed = 4410;
int captureDeviceNo = -1;
int playbackDeviceNo = -1;
int MicDeviceNo = -1;
int LSDeviceNo = -1;
int initialPBvol = -1;
int initialCAPvol = -1;
int announcement = 0;
int VoiceAudioMode = VOICEMODE_OFF;
int codec = 1; // 0=opus, 1=codec2
int init_audio_result = 0;
int init_voice_result = 0;
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
init_packer();
initFEC();
init_fft();
init_voiceproc();
/*int ar = init_audio(playbackDeviceNo, captureDeviceNo);
if (ar == -1)
{
keeprunning = 0;
exit(0);
}*/
// 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 GR Receiver
//UdpRxInit(&DATA_sock_from_GR, UdpDataPort_fromGR, &GRdata_rxdata, &keeprunning);
printf("QO100modem initialised and running\n");
while (keeprunning)
{
if (restart_modems == 1)
{
startModem();
restart_modems = 0;
}
//doArraySend();
if (VoiceAudioMode == VOICEMODE_INTERNALLOOP)
{
// loop voice mic to LS
float f;
if (cap_read_fifo_voice(&f))
{
if(softwareCAPvolume_voice >= 0)
f *= softwareCAPvolume_voice;
pb_write_fifo_voice(f);
}
}
if (VoiceAudioMode == VOICEMODE_CODECLOOP || VoiceAudioMode == VOICEMODE_DV_FULLDUPLEX)
{
// send mic to codec
float f;
if (cap_read_fifo_voice(&f))
{
if (softwareCAPvolume_voice >= 0)
f *= softwareCAPvolume_voice;
encode(f);
}
}
// demodulate incoming audio data stream
static int old_tm = 0;
int tm = getus();
if (tm >= (old_tm + 1000000))
{
// read Audio device list every 1s
readAudioDevices();
old_tm = tm;
}
int dret = demodulator();
#ifdef _LINUX_
if(dret == 0)
usleep(1);
#endif
}
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
SPEEDRATE sr[8] = {
// 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}
};
void startModem()
{
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;
// int TX audio and modulator
close_dsp();
init_audio_result = init_audio(playbackDeviceNo, captureDeviceNo);
setPBvolume(initialPBvol);
setCAPvolume(initialCAPvol);
init_dsp();
}
void setAudioDevices(int pb, int cap, int pbvol, int capvol, int announce, int pbls, int pbmic)
{
//printf("%d %d\n", pb, cap);
if (pb != playbackDeviceNo || cap != captureDeviceNo)
{
restart_modems = 1;
playbackDeviceNo = pb;
captureDeviceNo = cap;
initialPBvol = pbvol;
initialCAPvol = capvol;
initialLSvol = pbls;
initialMICvol = pbmic;
}
announcement = announce;
}
// called from UDP RX thread for Broadcast-search from App
void bc_rxdata(uint8_t* pdata, int len, struct sockaddr_in* rxsock)
{
if (len > 0 && pdata[0] == 0x3c)
{
setAudioDevices(pdata[1], pdata[2], pdata[3], pdata[4], pdata[5], pdata[6], pdata[7]);
char rxip[20];
strcpy(rxip, inet_ntoa(rxsock->sin_addr));
if (fixappIP == 0)
{
if (strcmp(appIP, rxip))
{
printf("new 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 = getAudioDevicelist(&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);
restart_modems = 1;
// 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 = getAudioDevicelist(&alen);
sendUDP(appIP, UdpDataPort_ModemToApp, txdata, alen);
}
}
}
}
// called by UDP RX thread for data from App
void appdata_rxdata(uint8_t* pdata, int len, struct sockaddr_in* rxsock)
{
uint8_t type = pdata[0];
uint8_t minfo = pdata[1];
// type values: see oscardata config.cs: frame types
if (type == 16)
{
// Byte 1 contains the resampler ratio for TX and RX modem
if (pdata[1] >= 8)
{
printf("wrong speedmode %d, ignoring\n", pdata[1]);
return;
}
speedmode = pdata[1];
printf("set speedmode to %d\n", speedmode);
restart_modems = 1;
transmissions = 1000; // announcement at next TX
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
int r = system("sudo shutdown now");
exit(r);
}
if (type == 20)
{
// reset liquid RX modem
resetModem();
return;
}
if (type == 21)
{
// set playback volume (in % 0..100)
setVolume(0,minfo);
return;
}
if (type == 22)
{
// set capture volume (in % 0..100)
setVolume(1,minfo);
return;
}
if (type == 23)
{
// set playback volume (in % 0..100)
setVolume_voice(0, minfo);
return;
}
if (type == 24)
{
// set capture volume (in % 0..100)
setVolume_voice(1, minfo);
return;
}
if (type == 25)
{
//printf("%d %d %d %d %d\n", pdata[0], pdata[1], pdata[2], pdata[3], pdata[4]);
LSDeviceNo = pdata[1];
MicDeviceNo = pdata[2];
VoiceAudioMode = pdata[3];
codec = pdata[4];
// init voice audio
init_voice_result = init_audio_voice(LSDeviceNo, MicDeviceNo);
init_voiceproc();
return;
}
if (type == 26)
{
// GUI requests termination of this hsmodem
printf("shut down hsmodem\n");
closeAllandTerminate();
}
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)
if (minfo == 0 || minfo == 3)
{
// this is the first frame of a larger file
sendAnnouncement();
// send it multiple times, like a preamble, to give the
// receiver some time for synchronisation
// caprate: samples/s. This are symbols: caprate/txinterpolfactor
// and bits: symbols * bitsPerSymbol
// and bytes/second: bits/8 = (caprate/txinterpolfactor) * bitsPerSymbol / 8
// one frame has 258 bytes, so we need for 6s: 6* ((caprate/txinterpolfactor) * bitsPerSymbol / 8) /258 + 1 frames
int numframespreamble = 6 * ((caprate / txinterpolfactor) * bitsPerSymbol / 8) / 258 + 1;
for (int i = 0; i < numframespreamble; i++)
toGR_sendData(pdata + 2, type, minfo);
}
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);
toGR_sendData(payload, type, minfo);
}
else
{
toGR_sendData(pdata + 2, type, minfo);
}
}
void toGR_sendData(uint8_t* data, int type, int status)
{
int len = 0;
uint8_t* txdata = Pack(data, type, status, &len);
//showbytestring((char *)"BERtx: ", txdata, len);
if (txdata != NULL)
sendToModulator(txdata, len);
}
// called by liquid demodulator for received data
void GRdata_rxdata(uint8_t* pdata, int len, struct sockaddr_in* rxsock)
{
static int fnd = 0;
// raw symbols
uint8_t* pl = unpack_data(pdata, len);
if (pl != NULL)
{
if (VoiceAudioMode != VOICEMODE_DV_FULLDUPLEX)
{
// complete frame received
// 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);
}
else
{
// send to Codec decoder
if (*(pl + 3) != 0) // minfo=0 ... just a filler, ignore
toCodecDecoder(pl + 10, PAYLOADLEN);
}
fnd = 0;
}
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 ws = 4;
int wt = sr[speedmode].audio / sr[speedmode].tx;
if (++fnd >= (wt * ws))
{
fnd = 0;
printf("no signal detected %d, reset RX modem\n", wt);
resetModem();
}
}
}
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