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Added basic variable decimation

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This commit is contained in:
f4exb
2015-05-09 16:44:26 +02:00
parent f07934cc80
commit 7ea41283e8
7 changed files with 131 additions and 4 deletions
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plugins/samplesource/rtlsdr/rtlsdrthread.cpp
+43 -3
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@@ -28,7 +28,8 @@ RTLSDRThread::RTLSDRThread(rtlsdr_dev_t* dev, SampleFifo* sampleFifo, QObject* p
m_dev(dev),
m_convertBuffer(BLOCKSIZE),
m_sampleFifo(sampleFifo),
m_samplerate(288000)
m_samplerate(288000),
m_log2Decim(4)
{
}
@@ -57,6 +58,11 @@ void RTLSDRThread::setSamplerate(int samplerate)
m_samplerate = samplerate;
}
void RTLSDRThread::setLog2Decimation(unsigned int log2_decim)
{
m_log2Decim = log2_decim;
}
void RTLSDRThread::run()
{
int res;
@@ -74,6 +80,18 @@ void RTLSDRThread::run()
m_running = false;
}
void RTLSDRThread::decimate1(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
for (int pos = 0; pos < len; pos += 2) {
xreal = buf[pos+0];
yimag = buf[pos+1];
Sample s( xreal << 3, yimag << 3 );
**it = s;
(*it)++;
}
}
void RTLSDRThread::decimate2(SampleVector::iterator* it, const quint8* buf, qint32 len)
{
qint16 xreal, yimag;
@@ -146,18 +164,40 @@ void RTLSDRThread::decimate16(SampleVector::iterator* it, const quint8* buf, qin
// Decimate everything by 16x, except 288kHz by 4x
// and 1152kHz, 2048kHz by 8x
// Decimate according to specified log2 (ex: log2=4 => decim=16)
void RTLSDRThread::callback(const quint8* buf, qint32 len)
{
SampleVector::iterator it = m_convertBuffer.begin();
switch (m_log2Decim)
{
case 0:
decimate1(&it, buf, len);
break;
case 1:
decimate2(&it, buf, len);
break;
case 2:
decimate4(&it, buf, len);
break;
case 3:
decimate8(&it, buf, len);
break;
case 4:
decimate16(&it, buf, len);
break;
default:
break;
}
/*
if (m_samplerate < 800000)
decimate4(&it, buf, len);
else if ((m_samplerate == 1152000)||(m_samplerate == 2048000))
decimate8(&it, buf, len);
else
decimate16(&it, buf, len);
*/
m_sampleFifo->write(m_convertBuffer.begin(), it);