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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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plugins/samplesource/rtlsdr/rtlsdrthread.cpp
+5 -62
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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);
}