C++11 STL Qt Creator Lubuntu

STK example 2: random beeps is an STK example that generates random beeps infinitely (note: you cannot stop the program). The code was modified from https://ccrma.stanford.edu/software/stk/crealtime.html.

Note that the original copy-pasted code resulted in multiple compile warnings and that the library style, design and example code looks different from the experts' recommendations

Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppStkExample2/CppStkExample2.pro




include(../../ConsoleApplication.pri) #Or use the code below

# QT += core

# QT += gui

# greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

# CONFIG   += console

# CONFIG   -= app_bundle

# TEMPLATE = app

# CONFIG(release, debug|release) {

#   DEFINES += NDEBUG NTRACE_BILDERBIKKEL

# }

# QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

# unix {

#   QMAKE_CXXFLAGS += -Werror

# }



include(../../Libraries/Boost.pri) #Or use the code below

# win32 {

#   INCLUDEPATH += \

#     ../../Libraries/boost_1_54_0

# }





# Install STK by:

# sudo apt-get install libstk0-dev

include(../../Libraries/Stk.pri) #Or use the code below

# INCLUDEPATH += /usr/include/stk

# LIBS += -L/usr/lib -lstk -lrtaudio



SOURCES += main.cpp

./CppStkExample2/main.cpp




//From http://www.richelbilderbeek.nl/CppStk.htm

//Modified from crtsine.cpp STK tutorial program

#include <boost/static_assert.hpp>

#include <boost/timer.hpp>



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#pragma GCC diagnostic ignored "-Wunused-variable"

#include "SineWave.h"

#include "RtAudio.h"

#pragma GCC diagnostic pop



// This tick() function handles sample computation only. It will be

// called automatically when the system needs a new buffer of audio

// samples.

int tick(

  void *outputBuffer, void * /*inputBuffer*/,

  unsigned int nBufferFrames,

  double /*streamTime*/, RtAudioStreamStatus /*status*/,

  void *dataPointer)

{

  stk::SineWave * const sine = (stk::SineWave *) dataPointer;

  stk::StkFloat * samples = (stk::StkFloat *) outputBuffer;



  for ( unsigned int i=0; i!=nBufferFrames; ++i )

    *samples++ = sine->tick();

  return 0;

}





int main()

{

  // Set the global sample rate before creating class instances.

  stk::Stk::setSampleRate( 44100.0 );



  // Setup the RtAudio stream.

  RtAudio dac;

  RtAudio::StreamParameters parameters;

  parameters.deviceId = dac.getDefaultOutputDevice();

  parameters.nChannels = 1;

  BOOST_STATIC_ASSERT(sizeof(stk::StkFloat) == 8);

  unsigned int bufferFrames = stk::RT_BUFFER_SIZE;



  while (1)

  {

    //Choose a random beep frequency

    stk::SineWave sine;

    dac.openStream(

      &parameters, NULL,

      RTAUDIO_FLOAT64,

      (unsigned int)stk::Stk::sampleRate(),

      &bufferFrames, &tick,

      (void *)&sine );

    sine.setFrequency(100.0

      + static_cast<double>(std::rand()%1000));

    dac.startStream();

    //Let it beep for 0.2 seconds

    boost::timer t;

    while (t.elapsed() < 0.2 ) {}

    //Prepare for next beep

    dac.closeStream();

  }

}

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(C++) StkExample2

Technical facts

Qt project file: ./CppStkExample2/CppStkExample2.pro

./CppStkExample2/main.cpp