Added RTTY example program.

examples/sdr_rtty.cc

@@ -0,0 +1,70 @@
+#include "autocast.hh"
+#include "portaudio.hh"
+#include "wavfile.hh"
+#include "afsk.hh"
+#include "baudot.hh"
+#include "utils.hh"
+
+#include <iostream>
+#include <cmath>
+#include <csignal>
+
+using namespace sdr;
+
+static void __sigint_handler(int signo) {
+  // On SIGINT -> stop queue properly
+  Queue::get().stop();
+}
+
+
+int main(int argc, char *argv[])
+{
+  if (2 != argc) {
+    std::cerr << "Usage: sdr_rtty FILENAME" << std::endl;
+    return -1;
+  }
+
+  sdr::Logger::get().addHandler(
+        new sdr::StreamLogHandler(std::cerr, sdr::LOG_DEBUG));
+
+  // Register handler:
+  signal(SIGINT, __sigint_handler);
+
+  PortAudio::init();
+
+  Queue &queue = Queue::get();
+
+  WavSource src(argv[1]);
+  PortSink sink;
+  AutoCast<int16_t> cast;
+  AFSK fsk(90.90, 930., 1100., AFSK::NORMAL);
+  Baudot decoder;
+  TextDump dump;
+
+  // Playback
+  src.connect(&sink);
+  // Cast to int16
+  src.connect(&cast);
+  // FSK demod
+  cast.connect(&fsk);
+  // Baudot decoder
+  fsk.connect(&decoder);
+  // dump to std::cerr
+  decoder.connect(&dump);
+
+  // on idle -> read next buffer from input file
+  queue.addIdle(&src, &WavSource::next);
+  // on end-of-file -> stop queue
+  src.addEOS(&queue, &Queue::stop);
+
+  // Start queue
+  queue.start();
+  // wait for queue to exit
+  queue.wait();
+
+  // terminate port audio system properly
+  PortAudio::terminate();
+
+  // quit.
+  return 0;
+}