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UDPSink buffer: implemented R/W pointer skew auto compensation

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This commit is contained in:
f4exb 2017-08-16 11:35:47 +02:00
parent 2cff745cda
commit 60b502ce7e
4 changed files with 40 additions and 6 deletions
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16
plugins/channeltx/udpsink/udpsink.cpp
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@ -115,8 +115,6 @@ void UDPSink::modulateSample()
bool UDPSink::handleMessage(const Message& cmd)
{
qDebug() << "UDPSink::handleMessage";
if (UpChannelizer::MsgChannelizerNotification::match(cmd))
{
UpChannelizer::MsgChannelizerNotification& notif = (UpChannelizer::MsgChannelizerNotification&) cmd;
@ -167,7 +165,17 @@ bool UDPSink::handleMessage(const Message& cmd)
}
else if (UDPSinkMessages::MsgSampleRateCorrection::match(cmd))
{
// TODO
UDPSinkMessages::MsgSampleRateCorrection& cfg = (UDPSinkMessages::MsgSampleRateCorrection&) cmd;
m_actualInputSampleRate += cfg.getCorrectionFactor() * m_actualInputSampleRate;
qDebug("UDPSink::handleMessage: MsgSampleRateCorrection: corr: %f new rate: %f", cfg.getCorrectionFactor(), m_actualInputSampleRate);
m_settingsMutex.lock();
m_interpolatorDistanceRemain = 0;
m_interpolatorConsumed = false;
m_interpolatorDistance = (Real) m_actualInputSampleRate / (Real) m_config.m_outputSampleRate;
//m_interpolator.create(48, m_actualInputSampleRate, m_config.m_rfBandwidth / 2.2, 3.0); // causes clicking: leaving at standard frequency
m_settingsMutex.unlock();
return true;
}
else
@ -223,6 +231,8 @@ void UDPSink::apply(bool force)
m_interpolatorConsumed = false;
m_interpolatorDistance = (Real) m_config.m_inputSampleRate / (Real) m_config.m_outputSampleRate;
m_interpolator.create(48, m_config.m_inputSampleRate, m_config.m_rfBandwidth / 2.2, 3.0);
m_actualInputSampleRate = m_config.m_inputSampleRate;
m_udpHandler.resetReadIndex();
m_settingsMutex.unlock();
}

1
plugins/channeltx/udpsink/udpsink.h
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@ -198,6 +198,7 @@ private:
MovingAverage<double> m_movingAverage;
UDPSinkUDPHandler m_udpHandler;
Real m_actualInputSampleRate; //!< sample rate with UDP buffer skew compensation
QMutex m_settingsMutex;

26
plugins/channeltx/udpsink/udpsinkudphandler.cpp
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@ -16,7 +16,9 @@
#include <QDebug>
#include "udpsinkmsg.h"
#include "udpsinkudphandler.h"
#include "util/messagequeue.h"
UDPSinkUDPHandler::UDPSinkUDPHandler() :
m_dataSocket(0),
@ -29,6 +31,7 @@ UDPSinkUDPHandler::UDPSinkUDPHandler() :
m_readFrameIndex(m_nbUDPFrames/2),
m_readIndex(0),
m_rwDelta(m_nbUDPFrames/2),
m_d(0),
m_feedbackMessageQueue(0)
{
}
@ -136,8 +139,26 @@ void UDPSinkUDPHandler::advanceReadPointer(int nbBytes)
{
m_rwDelta = m_writeIndex; // raw R/W delta estimate
float d = (m_rwDelta - (m_nbUDPFrames/2))/(float) m_nbUDPFrames;
qDebug("UDPSinkUDPHandler::advanceReadPointer: w: %02d d: %f", m_writeIndex, d);
m_readFrameIndex = 0;
//qDebug("UDPSinkUDPHandler::advanceReadPointer: w: %02d d: %f", m_writeIndex, d);
if ((d < -0.45) || (d > 0.45))
{
resetReadIndex();
}
else
{
float dd = d - m_d; // derivative
float c = (d + dd) / 10.0; // (d / 10.0) + (dd / 10.0); // damping and scaling
c = c < -0.05 ? -0.05 : c > 0.05 ? 0.05 : c; // limit
UDPSinkMessages::MsgSampleRateCorrection *msg = UDPSinkMessages::MsgSampleRateCorrection::create(c);
if (m_feedbackMessageQueue) {
m_feedbackMessageQueue->push(msg);
}
m_readFrameIndex = 0;
m_d = d;
}
}
}
}
@ -164,4 +185,5 @@ void UDPSinkUDPHandler::resetReadIndex()
m_readFrameIndex = (m_writeIndex + (m_nbUDPFrames/2)) % m_nbUDPFrames;
m_rwDelta = m_nbUDPFrames/2;
m_readIndex = 0;
m_d = 0.0f;
}

3
plugins/channeltx/udpsink/udpsinkudphandler.h
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@ -54,7 +54,7 @@ public:
}
static const int m_udpBlockSize = 512; // UDP block size in number of bytes
static const int m_nbUDPFrames = 128; // number of frames of block size in the UDP buffer
static const int m_nbUDPFrames = 256; // number of frames of block size in the UDP buffer
public slots:
void dataReadyRead();
@ -75,6 +75,7 @@ private:
int m_readFrameIndex;
int m_readIndex;
int m_rwDelta;
float m_d;
MessageQueue *m_feedbackMessageQueue;
};