WSJT-X/main.cpp
Bill Somerville 688943e779 Fix audio input rate issue on Windows Vista
Windows Vista has a broken rate converter which gets invoked when an
input audio stream at 48kHz sampel rate is requested. I've no idea why
our application can't get exclusive access to the audio input device
and have a unconverted stream direct at 48kHz.

To get around this our down sampling filter for audio input from 48kHz
to 12kHz is disaabled by default on Windows Vista, instead we request
a 12kHz stream and process it directly.

This default behviour can be overriden by specifying the following
settings value:

[Tune]
Audio\DisableInputResampling=false

This settings value defaults to true on Windows Vista and false
everywhere else so normally needn't be present.



git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3588 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2013-10-04 19:00:29 +00:00

78 lines
2.1 KiB
C++

#ifdef QT5
#include <QtWidgets>
#else
#include <QtGui>
#endif
#include <QApplication>
#include <QObject>
#include <QSettings>
#include <QSysInfo>
#include "mainwindow.h"
// Multiple instances:
QSharedMemory mem_jt9;
QUuid my_uuid;
QString my_key;
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
qRegisterMetaType<AudioDevice::Channel> ("AudioDevice::Channel");
QSettings settings(a.applicationDirPath() + "/wsjtx.ini", QSettings::IniFormat);
QFile f("fonts.txt");
qint32 fontSize,fontWeight,fontSize2,fontWeight2; // Defaults 8 50 10 50
fontSize2=10;
fontWeight2=50;
if(f.open(QIODevice::ReadOnly)) {
QTextStream in(&f);
in >> fontSize >> fontWeight >> fontSize2 >> fontWeight2;
f.close();
QFont font=a.font();
if(fontSize!=8) font.setPointSize(fontSize);
font.setWeight(fontWeight); //Set the GUI fonts
a.setFont(font);
}
// Create and initialize shared memory segment
// Multiple instances: generate shared memory keys with UUID
my_uuid = QUuid::createUuid();
my_key = my_uuid.toString();
mem_jt9.setKey(my_key);
if(!mem_jt9.attach()) {
if (!mem_jt9.create(sizeof(jt9com_))) {
QMessageBox::critical( 0, "Error", "Unable to create shared memory segment.");
exit(1);
}
}
char *to = (char*)mem_jt9.data();
int size=sizeof(jt9com_);
if(jt9com_.newdat==0) {
}
memset(to,0,size); //Zero all decoding params in shared memory
settings.beginGroup ("Tune");
// deal with Windows Vista input audio rate converter problems
unsigned downSampleFactor = settings.value ("Audio/DisableInputResampling",
#if defined (Q_OS_WIN)
QSysInfo::WV_VISTA == QSysInfo::WindowsVersion ? true : false
#else
false
#endif
).toBool () ? 1u : 4u;
settings.endGroup ();
// Multiple instances: Call MainWindow() with the UUID key
MainWindow w(&settings, &mem_jt9, &my_key, fontSize2, fontWeight2, downSampleFactor);
w.show();
QObject::connect (&a, SIGNAL (lastWindowClosed()), &a, SLOT (quit()));
return a.exec();
}