Move library tree where it belongs

lib-src/rtaudio/tests/play_saw.cpp

@@ -0,0 +1,129 @@
+/******************************************/
+/*
+  play_saw.c
+  by Gary P. Scavone, 2001
+
+  Play sawtooth waveforms of distinct frequency.
+  Takes number of channels and sample rate as
+  input arguments.  Uses blocking functionality.
+*/
+/******************************************/
+
+#include "RtAudio.h"
+#include <iostream>
+
+/*
+typedef signed long  MY_TYPE;
+#define FORMAT RTAUDIO_SINT24
+#define SCALE  2147483647.0
+
+typedef char  MY_TYPE;
+#define FORMAT RTAUDIO_SINT8
+#define SCALE  127.0
+*/
+
+typedef signed short  MY_TYPE;
+#define FORMAT RTAUDIO_SINT16
+#define SCALE  32767.0
+
+/*
+typedef signed long  MY_TYPE;
+#define FORMAT RTAUDIO_SINT32
+#define SCALE  2147483647.0
+
+typedef float  MY_TYPE;
+#define FORMAT RTAUDIO_FLOAT32
+#define SCALE  1.0
+
+typedef double  MY_TYPE;
+#define FORMAT RTAUDIO_FLOAT64
+#define SCALE  1.0
+*/
+
+#define BASE_RATE 0.005
+#define TIME   4.0
+
+void usage(void) {
+  // Error function in case of incorrect command-line
+  // argument specifications.
+  std::cout << "\nuseage: play_saw N fs <device>\n";
+  std::cout << "    where N = number of channels,\n";
+  std::cout << "    fs = the sample rate,\n";
+  std::cout << "    and device = the device to use (default = 0).\n\n";
+  exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+  int chans, fs, buffer_size, device = 0;
+  long frames, counter = 0, i, j;
+  MY_TYPE *buffer;
+  RtAudio *audio;
+  double *data = 0;
+
+  // minimal command-line checking
+  if (argc != 3 && argc != 4 ) usage();
+
+  chans = (int) atoi(argv[1]);
+  fs = (int) atoi(argv[2]);
+  if ( argc == 4 )
+    device = (int) atoi(argv[3]);
+
+  // Open the realtime output device
+  buffer_size = 512;
+  try {
+    audio = new RtAudio(device, chans, 0, 0,
+                        FORMAT, fs, &buffer_size, 4);
+  }
+  catch (RtError &error) {
+    error.printMessage();
+    exit(EXIT_FAILURE);
+  }
+
+  frames = (long) (fs * TIME);
+  data = (double *) calloc(chans, sizeof(double));
+
+  try {
+    buffer = (MY_TYPE *) audio->getStreamBuffer();
+    audio->startStream();
+  }
+  catch (RtError &error) {
+    error.printMessage();
+    goto cleanup;
+  }
+
+  std::cout << "\nPlaying for " << TIME << " seconds ... buffer size = " << buffer_size << "." << std::endl;
+  while (counter < frames) {
+    for (i=0; i<buffer_size; i++) {
+      for (j=0; j<chans; j++) {
+        buffer[i*chans+j] = (MY_TYPE) (data[j] * SCALE);
+        data[j] += BASE_RATE * (j+1+(j*0.1));
+        if (data[j] >= 1.0) data[j] -= 2.0;
+      }
+    }
+
+    try {
+      audio->tickStream();
+    }
+    catch (RtError &error) {
+      error.printMessage();
+      goto cleanup;
+    }
+
+    counter += buffer_size;
+  }
+
+  try {
+    audio->stopStream();
+  }
+  catch (RtError &error) {
+    error.printMessage();
+  }
+
+ cleanup:
+  audio->closeStream();
+  delete audio;
+  if (data) free(data);
+
+  return 0;
+}