qtforum.de

Code: Alles auswählen

TEMPLATE 	= 	app
DEFINES 	+= 	__WINDOWS_DS__
DEFINES 	-= 	UNICODE 
DEPENDPATH 	+= 	.
INCLUDEPATH 	+= 	.
INCLUDEPATH 	+= 	./include
LIBS 		+= 	c:/rttest/dsound.lib
LIBS		+=	c:/mingw/lib/libole32.a
LIBS		+=	c:/mingw/lib/libwinmm.a
CONFIG 		+= 	qt warn_on release
HEADERS 	+= 	RtAudio.h
SOURCES 	+= 	RtAudio.cpp
SOURCES 	+= 	main.cpp

Code: Alles auswählen

#include <QtGui>
#include <QApplication>
#include <QPushButton>
#include "RtAudio.h"
#include <iostream>
#include <dsound.h>

int saw( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames, double streamTime, RtAudioStreamStatus status, void *userData ) {
  unsigned int i, j;
  double *buffer = (double *) outputBuffer;
  double *lastValues = (double *) userData;
  if ( status )
    std::cout << "Stream underflow detected!" << std::endl;

  // Write interleaved audio data.
  for ( i=0; i<nBufferFrames; i++ ) {
    for ( j=0; j<2; j++ ) {
      *buffer++ = lastValues[j];

      lastValues[j] += 0.005 * (j+1+(j*0.1));
      if ( lastValues[j] >= 1.0 ) lastValues[j] -= 2.0;
    }
  }
  return 0;
}

int main(int argc, char *argv[]) {
  QApplication app(argc, argv);

  RtAudio dac;
  if ( dac.getDeviceCount() < 1 ) {
    setMessage("\nNo audio devices found!\n");
    exit( 0 );
  }

  RtAudio::StreamParameters parameters;
  parameters.deviceId = dac.getDefaultOutputDevice();
  parameters.nChannels = 2;
  parameters.firstChannel = 0;
  unsigned int sampleRate = 44100;
  unsigned int bufferFrames = 256; // 256 sample frames
  double data[2];

  try {
    dac.openStream( &parameters, NULL, RTAUDIO_FLOAT64,
                    sampleRate, &bufferFrames, &saw, (void *)&data );
    dac.startStream();
  }
  catch ( RtError& e ) {
    exit( 0 );
  }

  QPushButton hello("Hallo");
  hello.resize(400, 30);
  hello.show();
  return app.exec();
}