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WSJT-X/Modulator/Modulator.cpp
Bill Somerville 0cf14dfcc9
Remove user adjustable audio buffer sizes from Settings 
Fixed buffer sizes are  used. Rx use s 3456 x 1st  downsample rate x 5
audio  frames  of  buffer  space.  On Windows  this  means  that  each
chunk (periodSize())  delivered from the  audio stream is  our initial
DSP processing chunk size, thus  matching audio buffer latency exactly
with WSJT-X's  own front  end latency. This  should result  in optimal
resilience to high system loads that might starve the soundcard ADC of
buffers to fill and case dropped audio frames.

For Tx  a buffer sufficient for  1 s of  audio is used at  present, on
Windows  the period  size will  be  set to  1/40 of  that which  gives
reasonably low latency  and plenty of resilience to  high system loads
that might  starve the soundcard DAC  of audio frames to  render. Note
that a 1 s  buffer will make the "Pwr" slider slow  to respond, we may
have to reduce the Tx audio buffer size if this is seen as a problem.
2020-08-11 13:48:01 +01:00

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#include "Modulator.hpp"
#include <limits>
#include <qmath.h>
#include <QDateTime>
#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
#include <QRandomGenerator>
#endif
#include <QDebug>
#include "widgets/mainwindow.h" // TODO: G4WJS - break this dependency
#include "Audio/soundout.h"
#include "commons.h"
#include "moc_Modulator.cpp"
extern float gran(); // Noise generator (for tests only)
#define RAMP_INCREMENT 64 // MUST be an integral factor of 2^16
#if defined (WSJT_SOFT_KEYING)
# define SOFT_KEYING WSJT_SOFT_KEYING
#else
# define SOFT_KEYING 1
#endif
double constexpr Modulator::m_twoPi;
// float wpm=20.0;
// unsigned m_nspd=1.2*48000.0/wpm;
// m_nspd=3072; //18.75 WPM
Modulator::Modulator (unsigned frameRate, double periodLengthInSeconds,
QObject * parent)
: AudioDevice {parent}
, m_quickClose {false}
, m_phi {0.0}
, m_toneSpacing {0.0}
, m_fSpread {0.0}
, m_period {periodLengthInSeconds}
, m_frameRate {frameRate}
, m_state {Idle}
, m_tuning {false}
, m_cwLevel {false}
, m_j0 {-1}
, m_toneFrequency0 {1500.0}
{
}
void Modulator::start (QString mode, unsigned symbolsLength, double framesPerSymbol,
double frequency, double toneSpacing,
SoundOutput * stream, Channel channel,
bool synchronize, bool fastMode, double dBSNR, double TRperiod)
{
// qDebug () << "mode:" << mode << "symbolsLength:" << symbolsLength << "framesPerSymbol:" << framesPerSymbol << "frequency:" << frequency << "toneSpacing:" << toneSpacing << "channel:" << channel << "synchronize:" << synchronize << "fastMode:" << fastMode << "dBSNR:" << dBSNR << "TRperiod:" << TRperiod;
Q_ASSERT (stream);
// Time according to this computer which becomes our base time
qint64 ms0 = QDateTime::currentMSecsSinceEpoch() % 86400000;
unsigned mstr = ms0 % int(1000.0*m_period); // ms into the nominal Tx start time
if(m_state != Idle) stop();
m_quickClose = false;
m_symbolsLength = symbolsLength;
m_isym0 = std::numeric_limits<unsigned>::max (); // big number
m_frequency0 = 0.;
m_phi = 0.;
m_addNoise = dBSNR < 0.;
m_nsps = framesPerSymbol;
m_frequency = frequency;
m_amp = std::numeric_limits<qint16>::max ();
m_toneSpacing = toneSpacing;
m_bFastMode=fastMode;
m_TRperiod=TRperiod;
unsigned delay_ms=1000;
if(mode=="FT8" or (mode=="FST4" and m_nsps==720)) delay_ms=500; //FT8, FST4-15
if(mode=="FT4") delay_ms=300; //FT4
// noise generator parameters
if (m_addNoise) {
m_snr = qPow (10.0, 0.05 * (dBSNR - 6.0));
m_fac = 3000.0;
if (m_snr > 1.0) m_fac = 3000.0 / m_snr;
}
m_silentFrames = 0;
m_ic=0;
if (!m_tuning && !m_bFastMode)
{
// calculate number of silent frames to send, so that audio will
// start at the nominal time "delay_ms" into the Tx sequence.
if (synchronize)
{
if(delay_ms > mstr) m_silentFrames = (delay_ms - mstr) * m_frameRate / 1000;
}
// adjust for late starts
if(!m_silentFrames && mstr >= delay_ms)
{
m_ic = (mstr - delay_ms) * m_frameRate / 1000;
}
}
initialize (QIODevice::ReadOnly, channel);
Q_EMIT stateChanged ((m_state = (synchronize && m_silentFrames) ?
Synchronizing : Active));
// qDebug() << "delay_ms:" << delay_ms << "mstr:" << mstr << "m_silentFrames:" << m_silentFrames << "m_ic:" << m_ic << "m_state:" << m_state;
m_stream = stream;
if (m_stream) m_stream->restart (this);
}
void Modulator::tune (bool newState)
{
m_tuning = newState;
if (!m_tuning) stop (true);
}
void Modulator::stop (bool quick)
{
m_quickClose = quick;
close ();
}
void Modulator::close ()
{
if (m_stream)
{
if (m_quickClose)
{
m_stream->reset ();
}
else
{
m_stream->stop ();
}
}
if (m_state != Idle)
{
Q_EMIT stateChanged ((m_state = Idle));
}
AudioDevice::close ();
}
qint64 Modulator::readData (char * data, qint64 maxSize)
{
//qDebug () << "readData: maxSize:" << maxSize;
double toneFrequency=1500.0;
if(m_nsps==6) {
toneFrequency=1000.0;
m_frequency=1000.0;
m_frequency0=1000.0;
}
if(maxSize==0) return 0;
Q_ASSERT (!(maxSize % qint64 (bytesPerFrame ()))); // no torn frames
Q_ASSERT (isOpen ());
qint64 numFrames (maxSize / bytesPerFrame ());
qint16 * samples (reinterpret_cast<qint16 *> (data));
qint16 * end (samples + numFrames * (bytesPerFrame () / sizeof (qint16)));
qint64 framesGenerated (0);
// if(m_ic==0) qDebug() << "aa" << 0.001*(QDateTime::currentMSecsSinceEpoch() % qint64(1000*m_TRperiod))
// << m_state << m_TRperiod << m_silentFrames << m_ic << foxcom_.wave[m_ic];
switch (m_state)
{
case Synchronizing:
{
if (m_silentFrames) { // send silence up to end of start delay
framesGenerated = qMin (m_silentFrames, numFrames);
do
{
samples = load (0, samples); // silence
} while (--m_silentFrames && samples != end);
if (!m_silentFrames)
{
Q_EMIT stateChanged ((m_state = Active));
}
}
m_cwLevel = false;
m_ramp = 0; // prepare for CW wave shaping
}
// fall through
case Active:
{
unsigned int isym=0;
if(!m_tuning) isym=m_ic/(4.0*m_nsps); // Actual fsample=48000
bool slowCwId=((isym >= m_symbolsLength) && (icw[0] > 0)) && (!m_bFastMode);
if(m_TRperiod==3.0) slowCwId=false;
bool fastCwId=false;
static bool bCwId=false;
qint64 ms = QDateTime::currentMSecsSinceEpoch();
float tsec=0.001*(ms % int(1000*m_TRperiod));
if(m_bFastMode and (icw[0]>0) and (tsec > (m_TRperiod-5.0))) fastCwId=true;
if(!m_bFastMode) m_nspd=2560; // 22.5 WPM
// qDebug() << "Mod A" << m_ic << isym << tsec;
if(slowCwId or fastCwId) { // Transmit CW ID?
m_dphi = m_twoPi*m_frequency/m_frameRate;
if(m_bFastMode and !bCwId) {
m_frequency=1500; // Set params for CW ID
m_dphi = m_twoPi*m_frequency/m_frameRate;
m_symbolsLength=126;
m_nsps=4096.0*12000.0/11025.0;
m_ic=2246949;
m_nspd=2560; // 22.5 WPM
if(icw[0]*m_nspd/48000.0 > 4.0) m_nspd=4.0*48000.0/icw[0]; //Faster CW for long calls
}
bCwId=true;
unsigned ic0 = m_symbolsLength * 4 * m_nsps;
unsigned j(0);
while (samples != end) {
j = (m_ic - ic0)/m_nspd + 1; // symbol of this sample
bool level {bool (icw[j])};
m_phi += m_dphi;
if (m_phi > m_twoPi) m_phi -= m_twoPi;
qint16 sample=0;
float amp=32767.0;
float x=0;
if(m_ramp!=0) {
x=qSin(float(m_phi));
if(SOFT_KEYING) {
amp=qAbs(qint32(m_ramp));
if(amp>32767.0) amp=32767.0;
}
sample=round(amp*x);
}
if(m_bFastMode) {
sample=0;
if(level) sample=32767.0*x;
}
if (int (j) <= icw[0] && j < NUM_CW_SYMBOLS) { // stop condition
samples = load (postProcessSample (sample), samples);
++framesGenerated;
++m_ic;
} else {
Q_EMIT stateChanged ((m_state = Idle));
return framesGenerated * bytesPerFrame ();
}
// adjust ramp
if ((m_ramp != 0 && m_ramp != std::numeric_limits<qint16>::min ()) || level != m_cwLevel) {
// either ramp has terminated at max/min or direction has changed
m_ramp += RAMP_INCREMENT; // ramp
}
m_cwLevel = level;
}
return framesGenerated * bytesPerFrame ();
} else {
bCwId=false;
} //End of code for CW ID
double const baud (12000.0 / m_nsps);
// fade out parameters (no fade out for tuning)
unsigned int i0,i1;
if(m_tuning) {
i1 = i0 = (m_bFastMode ? 999999 : 9999) * m_nsps;
} else {
i0=(m_symbolsLength - 0.017) * 4.0 * m_nsps;
i1= m_symbolsLength * 4.0 * m_nsps;
}
if(m_bFastMode and !m_tuning) {
i1=m_TRperiod*48000.0 - 24000.0;
i0=i1-816;
}
qint16 sample;
while (samples != end && m_ic <= i1) {
isym=0;
if(!m_tuning and m_TRperiod!=3.0) isym=m_ic/(4.0*m_nsps); //Actual fsample=48000
if(m_bFastMode) isym=isym%m_symbolsLength;
if (isym != m_isym0 || m_frequency != m_frequency0) {
if(itone[0]>=100) {
m_toneFrequency0=itone[0];
} else {
if(m_toneSpacing==0.0) {
m_toneFrequency0=m_frequency + itone[isym]*baud;
} else {
m_toneFrequency0=m_frequency + itone[isym]*m_toneSpacing;
}
}
m_dphi = m_twoPi * m_toneFrequency0 / m_frameRate;
m_isym0 = isym;
m_frequency0 = m_frequency; //???
}
int j=m_ic/480;
if(m_fSpread>0.0 and j!=m_j0) {
#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
float x1=QRandomGenerator::global ()->generateDouble ();
float x2=QRandomGenerator::global ()->generateDouble ();
#else
float x1=(float)qrand()/RAND_MAX;
float x2=(float)qrand()/RAND_MAX;
#endif
toneFrequency = m_toneFrequency0 + 0.5*m_fSpread*(x1+x2-1.0);
m_dphi = m_twoPi * toneFrequency / m_frameRate;
m_j0=j;
}
m_phi += m_dphi;
if (m_phi > m_twoPi) m_phi -= m_twoPi;
if (m_ic > i0) m_amp = 0.98 * m_amp;
if (m_ic > i1) m_amp = 0.0;
sample=qRound(m_amp*qSin(m_phi));
//Here's where we transmit from a precomputed wave[] array:
if(!m_tuning and (m_toneSpacing < 0)) {
m_amp=32767.0;
sample=qRound(m_amp*foxcom_.wave[m_ic]);
}
/*
if((m_ic<1000 or (4*m_symbolsLength*m_nsps - m_ic) < 1000) and (m_ic%10)==0) {
qDebug() << "cc" << QDateTime::currentDateTimeUtc().toString("hh:mm:ss.zzz") << m_ic << sample;
}
*/
samples = load(postProcessSample(sample), samples);
++framesGenerated;
++m_ic;
}
// qDebug() << "dd" << QDateTime::currentDateTimeUtc().toString("hh:mm:ss.zzz")
// << m_ic << i1 << foxcom_.wave[m_ic] << framesGenerated;
if (m_amp == 0.0) { // TODO G4WJS: compare double with zero might not be wise
if (icw[0] == 0) {
// no CW ID to send
Q_EMIT stateChanged ((m_state = Idle));
return framesGenerated * bytesPerFrame ();
}
m_phi = 0.0;
}
m_frequency0 = m_frequency;
// done for this chunk - continue on next call
// qDebug() << "Mod B" << m_ic << i1 << 0.001*(QDateTime::currentMSecsSinceEpoch() % (1000*m_TRperiod));
while (samples != end) // pad block with silence
{
samples = load (0, samples);
++framesGenerated;
}
return framesGenerated * bytesPerFrame ();
}
// fall through
case Idle:
break;
}
Q_ASSERT (Idle == m_state);
return 0;
}
qint16 Modulator::postProcessSample (qint16 sample) const
{
if (m_addNoise) { // Test frame, we'll add noise
qint32 s = m_fac * (gran () + sample * m_snr / 32768.0);
if (s > std::numeric_limits<qint16>::max ()) {
s = std::numeric_limits<qint16>::max ();
}
if (s < std::numeric_limits<qint16>::min ()) {
s = std::numeric_limits<qint16>::min ();
}
sample = s;
}
return sample;
}
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