Version 4.2.0

projects/examples/crtsine.cpp

@@ -0,0 +1,78 @@
+// crtsine.cpp STK tutorial program
+
+#include "WaveLoop.h"
+#include "RtAudio.h"
+
+// 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)
+{
+  WaveLoop *sine = (WaveLoop *) dataPointer;
+  register StkFloat *samples = (StkFloat *) buffer;
+
+  for ( int i=0; i<bufferSize; i++ )
+    *samples++ = sine->tick();
+
+  return 0;
+}
+
+int main()
+{
+  // Set the global sample rate before creating class instances.
+  Stk::setSampleRate( 44100.0 );
+
+  WaveLoop *sine = 0;
+  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();
+    goto cleanup;
+  }
+
+  try {
+    // Define and load the sine wave file
+    sine = new WaveLoop( "rawwaves/sinewave.raw", true );
+  }
+  catch (StkError &) {
+    goto cleanup;
+  }
+
+  sine->setFrequency(440.0);
+
+  try {
+    dac->setStreamCallback(&tick, (void *)sine);
+    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 sine;
+  delete dac;
+
+  return 0;
+}