added get_floats example

pysstv/examples/get_floats.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+"""
+This example streams the raw floating point samples to stdout in 4-byte
+single precision format, so that it can be processed outside PySSTV.
+
+Usage example: get_floats.py | play -r 44100 -t f32 -c 1 --norm -
+"""
+
+from pysstv.sstv import SSTV
+from PIL import Image
+from pysstv.grayscale import Robot8BW
+import struct, sys
+
+def main():
+    img = Image.open("160x120bw.png")
+    sstv = Robot8BW(img, 44100, 16)
+    sstv.vox_enabled = True
+    for value in sstv.gen_values():
+        sys.stdout.write(struct.pack('f', value))
+
+if __name__ == '__main__':
+    main()