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Samplerate options.

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This commit is contained in:
John Greb
2014-11-08 23:42:43 +00:00
parent 9c3b58d7a3
commit 812d0f4d15
7 changed files with 79 additions and 76 deletions
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plugins/samplesource/rtlsdr/rtlsdrthread.cpp
+21 -26
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@@ -28,9 +28,8 @@ RTLSDRThread::RTLSDRThread(rtlsdr_dev_t* dev, SampleFifo* sampleFifo, QObject* p
m_dev(dev),
m_convertBuffer(BLOCKSIZE),
m_sampleFifo(sampleFifo),
m_decimation(2)
m_samplerate(288000)
{
m_localdecimation = 0;
}
RTLSDRThread::~RTLSDRThread()
@@ -53,9 +52,9 @@ void RTLSDRThread::stopWork()
wait();
}
void RTLSDRThread::setDecimation(int decimation)
void RTLSDRThread::setSamplerate(int samplerate)
{
m_decimation = decimation;
m_samplerate = samplerate;
}
void RTLSDRThread::run()
@@ -136,43 +135,39 @@ void RTLSDRThread::decimate16(SampleVector::iterator* it, const quint8* buf, qin
}
}
/*
Decimate everything by 16x, except 288kHz
TODO : no offset tuning for direct sampling
*/
void RTLSDRThread::callback(const quint8* buf, qint32 len)
{
qint16 xreal, yimag, phase;
SampleVector::iterator it = m_convertBuffer.begin();
int decimationFactor[] = {1, 1, 1, 2, 4, 0};
if (++m_localdecimation < decimationFactor[m_decimation]) return;
m_localdecimation = 0;
int mode = 0;
if (m_samplerate < 800000)
mode = 2;
// if (directsampling) mode++;
switch(4 - m_decimation) {
case 0: // 1:1 = no decimation
// just rotation
phase = -(1<<2);
for (int pos = 0; pos < len + 3; pos += 4) {
phase *= -1;
xreal = phase * (2 * buf[pos+0] - 255);
yimag = phase * (2 * buf[pos+1] - 255);
*it++ = Sample(xreal, yimag);
xreal = phase * (255 - 2 * buf[pos+3]);
yimag = phase * (2 * buf[pos+2] - 255);
*it++ = Sample(xreal, yimag);
}
switch(mode) {
case 0:
decimate16(&it, buf, len);
break;
case 1: // 1:2
decimate2(&it, buf, len);
case 1:
// no_rotate16(&it, buf, len);
break;
case 2: // 1:4
case 2:
decimate4(&it, buf, len);
break;
case 3: // 1:8
decimate8(&it, buf, len);
case 3:
// norotate4(&it, buf, len);
break;
default:
case 4: // 1:16
decimate16(&it, buf, len);
break;
}