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(C++) StkExample1

 

C++11STLQt CreatorLubuntu

 

STK example 1: beep is an STK example that generates a beep. The code was copied from https://ccrma.stanford.edu/software/stk/crealtime.html.

 

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

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Qt project file: ./CppStkExample1/CppStkExample1.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

 

 

 

 

 

./CppStkExample1/main.cpp

 

// crtsine.cpp STK tutorial program

#pragma GCC diagnostic push
// I (RJCB) wish I did not need to add these ignores...
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#pragma GCC diagnostic ignored "-Wunused-variable"
#pragma GCC diagnostic ignored "-Wunused-parameter"

#include "SineWave.h"
#include "RtAudio.h"

using namespace stk;

// 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 )
{
  SineWave *sine = (SineWave *) dataPointer;
  register StkFloat *samples = (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::setSampleRate( 44100.0 );

  SineWave sine;
  RtAudio dac;

  // Figure out how many bytes in an StkFloat and setup the RtAudio stream.
  RtAudio::StreamParameters parameters;
  parameters.deviceId = dac.getDefaultOutputDevice();
  parameters.nChannels = 1;
  RtAudioFormat format = ( sizeof(StkFloat) == 8 )
    ? RTAUDIO_FLOAT64 : RTAUDIO_FLOAT32;
  unsigned int bufferFrames = RT_BUFFER_SIZE;
  try {
    dac.openStream( &parameters, NULL, format,
      (unsigned int)Stk::sampleRate(),
      &bufferFrames, &tick, (void *)&sine );
  }
  catch ( RtError &error ) {
    error.printMessage();
    goto cleanup;
  }

  sine.setFrequency(440.0);

  try {
    dac.startStream();
  }
  catch ( RtError &error ) {
    error.printMessage();
    goto cleanup;
  }

  // Block waiting here.
  char keyhit;
  std::cout << "\nPlaying ... press <enter> to quit.\n";
  std::cin.get( keyhit );

  // Shut down the output stream.
  try {
    dac.closeStream();
  }
  catch ( RtError &error ) {
    error.printMessage();
  }

  cleanup:

  return 0;
}

#pragma GCC diagnostic pop

 

 

 

 

 

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