Motown: Add examples/media_test, a command line media player app.

examples/media_test/keystroke.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <iostream>
+
+#include "examples/media_test/keystroke.h"
+
+namespace mojo {
+namespace media {
+namespace examples {
+
+namespace {
+
+bool eat_newline = false;
+bool upped_already = false;
+
+} // namespace
+
+char Keystroke(void) {
+  const char *kUp = "\033[A";
+
+  fcntl(STDIN_FILENO, F_SETFL, fcntl(0, F_GETFL) | O_NONBLOCK);
+  char buf[1];
+  if (read(STDIN_FILENO, buf, 1) > 0) {
+    if (!upped_already) {
+      std::cout << kUp << std::flush;
+      upped_already = true;
+    }
+
+    if (buf[0] == '\n') {
+      upped_already = false;
+      if (eat_newline) {
+        eat_newline = false;
+      } else {
+        return buf[0];
+      }
+    } else {
+      eat_newline = true;
+      return buf[0];
+    }
+  }
+  return 0;
+}
+
+}  // namespace examples
+}  // namespace media
+}  // namespace mojo