mirror of https://github.com/f4exb/sdrangel.git
130 lines
4.2 KiB
C++
130 lines
4.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
|
|
// written by Christian Daniel //
|
|
// (c) 2014 Modified by John Greb
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <QTime>
|
|
#include <stdio.h>
|
|
#include "usbdemod.h"
|
|
#include "audio/audiooutput.h"
|
|
#include "dsp/dspcommands.h"
|
|
|
|
MESSAGE_CLASS_DEFINITION(USBDemod::MsgConfigureUSBDemod, Message)
|
|
|
|
USBDemod::USBDemod(AudioFifo* audioFifo, SampleSink* sampleSink) :
|
|
m_sampleSink(sampleSink),
|
|
m_audioFifo(audioFifo)
|
|
{
|
|
m_Bandwidth = 5000;
|
|
m_volume = 2.0;
|
|
m_sampleRate = 96000;
|
|
m_frequency = 0;
|
|
m_sampleDistanceRemain = (Real)m_sampleRate / 48000.0;
|
|
|
|
m_audioBuffer.resize(512);
|
|
m_audioBufferFill = 0;
|
|
m_undersampleCount = 0;
|
|
|
|
USBFilter = new fftfilt(0.01, m_Bandwidth / 48000.0, usbFftLen);
|
|
// if (!USBFilter) segfault;
|
|
}
|
|
|
|
USBDemod::~USBDemod()
|
|
{
|
|
if (USBFilter) delete USBFilter;
|
|
}
|
|
|
|
void USBDemod::configure(MessageQueue* messageQueue, Real Bandwidth, Real volume)
|
|
{
|
|
Message* cmd = MsgConfigureUSBDemod::create(Bandwidth, volume);
|
|
cmd->submit(messageQueue, this);
|
|
}
|
|
|
|
void USBDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
|
|
{
|
|
Real a, b;
|
|
Complex c;
|
|
int n_out;
|
|
cmplx *sideband;
|
|
bool consumed;
|
|
|
|
for(SampleVector::const_iterator it = begin; it < end; ++it) {
|
|
a = it->real();
|
|
b = it->imag();
|
|
it++; // TODO: Assumes 96kHz; Expect breakage.
|
|
a += it->real();
|
|
b += it->imag();
|
|
c = Complex(a / 32678.0, b / 32768.0);
|
|
|
|
n_out = USBFilter->run(c, &sideband);
|
|
for (int i = 0; i < n_out; i++) {
|
|
Real demod = (sideband[i].real() + sideband[i].imag()) * 0.7 * 32768.0;
|
|
|
|
// Downsample by 4x for audio display
|
|
if (!(m_undersampleCount++ & 3))
|
|
m_sampleBuffer.push_back(Sample(demod, 0.0));
|
|
|
|
qint16 sample = (qint16)(demod * m_volume);
|
|
m_audioBuffer[m_audioBufferFill].l = sample;
|
|
m_audioBuffer[m_audioBufferFill].r = sample;
|
|
++m_audioBufferFill;
|
|
if(m_audioBufferFill >= m_audioBuffer.size()) {
|
|
uint res = m_audioFifo->write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 1);
|
|
m_audioBufferFill = 0;
|
|
}
|
|
m_sampleDistanceRemain += 2; // 96k in / 48k out
|
|
}
|
|
}
|
|
if(m_audioFifo->write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 0) != m_audioBufferFill)
|
|
;//qDebug("lost samples");
|
|
m_audioBufferFill = 0;
|
|
|
|
if(m_sampleSink != NULL)
|
|
m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), true);
|
|
m_sampleBuffer.clear();
|
|
}
|
|
|
|
void USBDemod::start()
|
|
{
|
|
}
|
|
|
|
void USBDemod::stop()
|
|
{
|
|
}
|
|
|
|
bool USBDemod::handleMessage(Message* cmd)
|
|
{
|
|
if(DSPSignalNotification::match(cmd)) {
|
|
DSPSignalNotification* signal = (DSPSignalNotification*)cmd;
|
|
m_sampleRate = signal->getSampleRate();
|
|
m_sampleDistanceRemain = 0.0;
|
|
cmd->completed();
|
|
return true;
|
|
} else if(MsgConfigureUSBDemod::match(cmd)) {
|
|
MsgConfigureUSBDemod* cfg = (MsgConfigureUSBDemod*)cmd;
|
|
m_Bandwidth = cfg->getBandwidth();
|
|
USBFilter->create_filter(0.01, m_Bandwidth / 48000.0);
|
|
m_volume = cfg->getVolume();
|
|
m_volume *= m_volume * 0.1;
|
|
cmd->completed();
|
|
return true;
|
|
} else {
|
|
if(m_sampleSink != NULL)
|
|
return m_sampleSink->handleMessage(cmd);
|
|
else return false;
|
|
}
|
|
}
|