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Rework decimation.

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This commit is contained in:
Hexameron 2014-05-28 19:13:09 +01:00
parent aaef1678ad
commit 444e8ed857
9 changed files with 25 additions and 97 deletions
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1
include/dsp/samplesource/samplesource.h
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@ -45,7 +45,6 @@ public:
virtual const QString& getDeviceDescription() const = 0;
virtual int getSampleRate() const = 0;
virtual int wfdecimation() const = 0;
virtual quint64 getCenterFrequency() const = 0;
virtual bool handleMessage(Message* message) = 0;

31
plugins/channel/nfm/nfmdemod.cpp
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@ -56,10 +56,12 @@ void NFMDemod::configure(MessageQueue* messageQueue, Real rfBandwidth, Real afBa
cmd->submit(messageQueue, this);
}
int framedrop = 0;
void NFMDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool firstOfBurst)
{
Complex ci;
bool consumed;
qint16 sample;
for(SampleVector::const_iterator it = begin; it < end; ++it) {
Complex c(it->real() / 32768.0, it->imag() / 32768.0);
@ -67,22 +69,25 @@ void NFMDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iter
consumed = false;
if(m_interpolator.interpolate(&m_sampleDistanceRemain, c, &consumed, &ci)) {
m_sampleBuffer.push_back(Sample(ci.real() * 32768.0, ci.imag() * 32768.0));
if (++framedrop & 1) {
m_movingAverage.feed(ci.real() * ci.real() + ci.imag() * ci.imag());
if(m_movingAverage.average() >= m_squelchLevel)
m_squelchState = m_sampleRate / 50;
}
Complex d = ci * conj(m_lastSample);
m_lastSample = ci;
Real demod = atan2(d.imag(), d.real()) / M_PI;
demod = m_volume * m_lowpass.filter(demod);
sample = demod * 32767;
m_movingAverage.feed(ci.real() * ci.real() + ci.imag() * ci.imag());
if (!(framedrop & 3))
m_sampleBuffer.push_back(Sample(sample, sample));
if(m_movingAverage.average() >= m_squelchLevel)
m_squelchState = m_sampleRate / 50;
if(m_squelchState > 0) {
if(m_squelchState > 0)
m_squelchState--;
Complex d = ci * conj(m_lastSample);
m_lastSample = ci;
Real demod = atan2(d.imag(), d.real()) / M_PI;
demod = m_lowpass.filter(demod);
demod *= m_volume;
qint16 sample = demod * 32767;
else
sample = 0;
{
m_audioBuffer[m_audioBufferFill].l = sample;
m_audioBuffer[m_audioBufferFill].r = sample;
++m_audioBufferFill;

2
plugins/channel/nfm/nfmdemodgui.cpp
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@ -164,7 +164,7 @@ NFMDemodGUI::NFMDemodGUI(PluginAPI* pluginAPI, QWidget* parent) :
m_pluginAPI->addSampleSink(m_threadedSampleSink);
ui->glSpectrum->setCenterFrequency(0);
ui->glSpectrum->setSampleRate(48000);
ui->glSpectrum->setSampleRate(12000);
ui->glSpectrum->setDisplayWaterfall(true);
ui->glSpectrum->setDisplayMaxHold(true);
m_spectrumVis->configure(m_threadedSampleSink->getMessageQueue(), 64, 10, FFTWindow::BlackmanHarris);

2
plugins/channel/ssb/ssbdemodgui.cpp
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@ -140,7 +140,7 @@ SSBDemodGUI::SSBDemodGUI(PluginAPI* pluginAPI, QWidget* parent) :
ui->glSpectrum->setCenterFrequency(0);
ui->glSpectrum->setSampleRate(12000);
ui->glSpectrum->setDisplayWaterfall(true);
ui->glSpectrum->setDisplayMaxHold(false);
ui->glSpectrum->setDisplayMaxHold(true);
m_spectrumVis->configure(m_threadedSampleSink->getMessageQueue(), 64, 10, FFTWindow::BlackmanHarris);
m_channelMarker = new ChannelMarker(this);

6
plugins/samplesource/rtlsdr/rtlsdrinput.cpp
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@ -185,12 +185,6 @@ int RTLSDRInput::getSampleRate() const
return 1536000 / (1 << m_settings.m_decimation);
}
int RTLSDRInput::wfdecimation() const
{
// decimate waterfall more when downsampling less
return (1 << (4 - m_settings.m_decimation) ) -1;
}
quint64 RTLSDRInput::getCenterFrequency() const
{
return m_generalSettings.m_centerFrequency;

1
plugins/samplesource/rtlsdr/rtlsdrinput.h
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@ -87,7 +87,6 @@ public:
const QString& getDeviceDescription() const;
int getSampleRate() const;
int wfdecimation() const;
quint64 getCenterFrequency() const;
bool handleMessage(Message* message);

67
plugins/samplesource/rtlsdr/rtlsdrthread.cpp
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@ -74,66 +74,6 @@ void RTLSDRThread::run()
m_running = false;
}
#if 0
void RTLSDRThread::decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
for(int pos = 0; pos < len; pos += 2) {
Sample s((((qint8)buf[pos]) - 128) << 8, (((qint8)buf[pos + 1]) - 128) << 8);
if(m_decimator2.workDecimateCenter(&s)) {
**it = s;
++(*it);
}
}
}
void RTLSDRThread::decimate4(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
for(int pos = 0; pos < len; pos += 2) {
Sample s((((qint8)buf[pos]) - 128) << 8, (((qint8)buf[pos + 1]) - 128) << 8);
if(m_decimator2.workDecimateCenter(&s)) {
if(m_decimator4.workDecimateCenter(&s)) {
**it = s;
++(*it);
}
}
}
}
void RTLSDRThread::decimate8(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
for(int pos = 0; pos < len; pos += 2) {
Sample s((((qint8)buf[pos]) - 128) << 8, (((qint8)buf[pos + 1]) - 128) << 8);
if(m_decimator2.workDecimateCenter(&s)) {
if(m_decimator4.workDecimateCenter(&s)) {
if(m_decimator8.workDecimateCenter(&s)) {
**it = s;
++(*it);
}
}
}
}
}
void RTLSDRThread::decimate16(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
for(int pos = 0; pos < len; pos += 2) {
Sample s((((qint8)buf[pos]) - 128) << 8, (((qint8)buf[pos + 1]) - 128) << 8);
if(m_decimator2.workDecimateCenter(&s)) {
if(m_decimator4.workDecimateCenter(&s)) {
if(m_decimator8.workDecimateCenter(&s)) {
if(m_decimator16.workDecimateCenter(&s)) {
**it = s;
++(*it);
}
}
}
}
}
}
#else
void RTLSDRThread::decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
@ -194,13 +134,16 @@ void RTLSDRThread::decimate16(SampleVector::iterator* it, const quint8* buf, qin
(*it)++;
}
}
#endif
int localdecimation = 0;
void RTLSDRThread::callback(const quint8* buf, qint32 len)
{
qint16 xreal, yimag, phase;
SampleVector::iterator it = m_convertBuffer.begin();
if (++localdecimation < (1 << (4 - m_decimation))) return;
localdecimation = 0;
switch(m_decimation) {
case 0: // 1:1 = no decimation
// just rotation
@ -210,7 +153,7 @@ void RTLSDRThread::callback(const quint8* buf, qint32 len)
xreal = phase * (buf[pos+0] - 127);
yimag = phase * (buf[pos+1] - 127);
*it++ = Sample( xreal<<7,yimag<<7);
xreal = phase * (128 - buf[pos+3]);
xreal = phase * (127 - buf[pos+3]);
yimag = phase * (buf[pos+2] - 127);
*it++ = Sample( xreal<<7,yimag<<7);
}

5
plugins/samplesource/rtlsdr/rtlsdrthread.h
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@ -48,11 +48,6 @@ private:
int m_decimation;
IntHalfbandFilter m_decimator2;
IntHalfbandFilter m_decimator4;
IntHalfbandFilter m_decimator8;
IntHalfbandFilter m_decimator16;
void run();
void decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len);

7
sdrbase/dsp/dspengine.cpp
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@ -196,7 +196,6 @@ void DSPEngine::imbalance(SampleVector::iterator begin, SampleVector::iterator e
it->m_imag = (it->m_imag * m_imbalance) >> 16;
}
int drop_frame = 0;
void DSPEngine::work()
{
SampleFifo* sampleFifo = m_sampleSource->getSampleFifo();
@ -211,12 +210,6 @@ void DSPEngine::work()
size_t count = sampleFifo->readBegin(sampleFifo->fill(), &part1begin, &part1end, &part2begin, &part2end);
if (m_sampleSource->wfdecimation() & drop_frame++) {
sampleFifo->readCommit(count);
samplesDone += count;
continue;
}
// first part of FIFO data
if(part1begin != part1end) {
// correct stuff