Version 4.2.1

projects/examples/crtblit.cpp

@@ -0,0 +1,81 @@
+// crtblit.cpp STK tutorial program
+
+#include "Blit.h"
+#include "BlitSaw.h"
+#include "RtAudio.h"
+
+unsigned long counter = 0;
+StkFloat frequency = 200.0;
+
+// This tick() function handles sample computation only.  It will be
+// called automatically when the system needs a new buffer of audio
+// samples.
+int tick(char *buffer, int bufferSize, void *dataPointer)
+{
+  BlitSaw *blit = (BlitSaw *) dataPointer;
+  register StkFloat *samples = (StkFloat *) buffer;
+
+  for ( int i=0; i<bufferSize; i++ ) {
+    *samples++ = blit->tick();
+
+    if ( counter++ % 500 == 0 && frequency < 3000.0 ) {
+      frequency *= 1.01;
+      blit->setFrequency( frequency );
+    }
+  }
+
+  return 0;
+}
+
+int main()
+{
+  // Set the global sample rate before creating class instances.
+  Stk::setSampleRate( 44100.0 );
+  Stk::showWarnings( true );
+
+  BlitSaw blit;
+  RtAudio *dac = 0;
+
+  // Figure out how many bytes in an StkFloat and setup the RtAudio object.
+  RtAudioFormat format = ( sizeof(StkFloat) == 8 ) ? RTAUDIO_FLOAT64 : RTAUDIO_FLOAT32;
+  int bufferSize = RT_BUFFER_SIZE;
+  try {
+    dac = new RtAudio(0, 1, 0, 0, format, (int)Stk::sampleRate(), &bufferSize, 4);
+  }
+  catch (RtError& error) {
+    error.printMessage();
+    exit(0);
+  }
+
+  blit.setFrequency( frequency );
+  blit.setHarmonics( 20 );
+
+  try {
+    dac->setStreamCallback(&tick, (void *)&blit);
+    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 callback and output stream.
+  try {
+    dac->cancelStreamCallback();
+    dac->closeStream();
+  }
+  catch (RtError &error) {
+    error.printMessage();
+  }
+
+ cleanup:
+
+  delete dac;
+
+  return 0;
+}