initial commit

beacon.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+
+"""
+This example streams the raw floating point (freq, msec) tuples to stdout
+in 4-byte single precision format (8 bytes per tuple), so that it can be
+processed outside PySSTV.
+
+Usage example using unixsstv/gen_values:
+beacon.py | gen_values 44100 | play -r 44100 -t f32 -c 1 --norm -
+"""
+
+from pysstv.sstv import SSTV
+from PIL import Image, ImageFont, ImageDraw
+from pysstv.color import MartinM2
+from subprocess import check_output
+from cStringIO import StringIO
+import RPi.GPIO as GPIO
+import struct, sys
+
+TX_PIN = 18
+
+def main():
+    img = Image.open(StringIO(check_output(['raspistill', '--output', '-',
+        '--width', '320', '--height', '256', '-e', 'bmp'])))
+    img = img.resize((MartinM2.WIDTH, MartinM2.HEIGHT))
+    font = ImageFont.load_default()
+    draw = ImageDraw.Draw(img)
+    draw.text((17, 17), "HA5KDR", (0, 0, 0), font=font)
+    draw.text((16, 16), "HA5KDR", (255, 255, 255), font=font)
+    sstv = MartinM2(img, 44100, 16)
+    sstv.vox_enabled = True
+    for freq, msec in sstv.gen_freq_bits():
+        sys.stdout.write(struct.pack('ff', freq, msec))
+    GPIO.setmode(GPIO.BCM)
+    GPIO.setup(TX_PIN, GPIO.OUT)
+    GPIO.output(TX_PIN, True)
+
+if __name__ == '__main__':
+    main()

beacon.sh

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+#!/bin/sh
+python /home/pi/beacon.py | /home/pi/unixsstv/gen_values 44100 >/tmp/wav.bin
+play -q -r 44100 -t f32 -c 1 --norm /tmp/wav.bin >/dev/null 2>&1
+python -c 'import RPi.GPIO as G; G.setmode(G.BCM); G.setup(18, G.OUT); G.output(18, False); G.cleanup()' >/dev/null 2>&1
+rm -f /tmp/wav.bin