(C++) StkExample2

 

 

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

 

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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

 

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//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();   } }