Version 2.0

1 files changed, 128 insertions, 0 deletions

diff --git a/tests/call_saw.cpp b/tests/call_saw.cpp
new file mode 100644
index 0000000..cb5509d
--- /dev/null
+++ b/tests/call_saw.cpp
@@ -0,0 +1,128 @@
+/******************************************/
+/*
+  call_saw.c
+  by Gary P. Scavone, 2001
+
+  Play sawtooth waveforms of distinct frequency.
+  Takes number of channels and sample rate as
+  input arguments.  Use callback functionality.
+*/
+/******************************************/
+
+#include "RtAudio.h"
+#include <iostream.h>
+
+/*
+typedef signed long  MY_TYPE;
+#define FORMAT RtAudio::RTAUDIO_SINT24
+#define SCALE  2147483647.0
+
+typedef char  MY_TYPE;
+#define FORMAT RtAudio::RTAUDIO_SINT8
+#define SCALE  127.0
+
+typedef signed short  MY_TYPE;
+#define FORMAT RtAudio::RTAUDIO_SINT16
+#define SCALE  32767.0
+
+typedef signed long  MY_TYPE;
+#define FORMAT RtAudio::RTAUDIO_SINT32
+#define SCALE  2147483647.0
+*/
+typedef float  MY_TYPE;
+#define FORMAT RtAudio::RTAUDIO_FLOAT32
+#define SCALE  1.0
+
+/*
+typedef double  MY_TYPE;
+#define FORMAT RtAudio::RTAUDIO_FLOAT64
+#define SCALE  1.0
+*/
+
+#define BASE_RATE 0.005
+#define TIME   1.0
+
+void usage(void) {
+  /* Error function in case of incorrect command-line
+     argument specifications
+  */
+  cout << "\nuseage: call_saw N fs\n";
+  cout << "    where N = number of channels,\n";
+  cout << "    and fs = the sample rate.\n\n";
+  exit(0);
+}
+
+int chans;
+
+int saw(char *buffer, int buffer_size, void *data)
+{
+  int i, j;
+  extern int chans;
+  MY_TYPE *my_buffer = (MY_TYPE *) buffer;
+  double *my_data = (double *) data;
+
+  for (i=0; i<buffer_size; i++) {
+    for (j=0; j<chans; j++) {
+      *my_buffer++ = (MY_TYPE) (my_data[j] * SCALE);
+      my_data[j] += BASE_RATE * (j+1+(j*0.1));
+      if (my_data[j] >= 1.0) my_data[j] -= 2.0;
+    }
+  }
+
+  return 0;
+}
+
+int main(int argc, char *argv[])
+{
+  int device, stream, buffer_size, fs;
+  RtAudio *audio;
+  double *data;
+  char input;
+
+  // minimal command-line checking
+  if (argc != 3) usage();
+
+  chans = (int) atoi(argv[1]);
+  fs = (int) atoi(argv[2]);
+
+  // Open the realtime output device
+  buffer_size = 256;
+  device = 0; // default device
+  try {
+    audio = new RtAudio(&stream, device, chans, 0, 0,
+                        FORMAT, fs, &buffer_size, 4);
+  }
+  catch (RtAudioError &m) {
+    m.printMessage();
+    exit(EXIT_FAILURE);
+  }
+
+  data = (double *) calloc(chans, sizeof(double));
+
+  try {
+    audio->setStreamCallback(stream, &saw, (void *)data);
+    audio->startStream(stream);
+  }
+  catch (RtAudioError &m) {
+    m.printMessage();
+    goto cleanup;
+  }
+
+  cout << "\nPlaying ... press <enter> to quit.\n";
+  cin.get(input);
+
+  // Stop the stream.
+  try {
+    audio->stopStream(stream);
+  }
+  catch (RtAudioError &m) {
+    m.printMessage();
+  }
+
+ cleanup:
+  audio->closeStream(stream);
+  delete audio;
+  if (data) free(data);
+
+  return 0;
+}