merged trondeau/digital-wip2 r4193:4730 into trunk - improves digital receiver and fixes ticket:72

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4731 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 136 insertions, 0 deletions

diff --git a/gnuradio-examples/python/hier/digital/rx_voice.py b/gnuradio-examples/python/hier/digital/rx_voice.py
new file mode 100755
index 000000000..130486245
--- /dev/null
+++ b/gnuradio-examples/python/hier/digital/rx_voice.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python
+#
+# Copyright 2005,2006 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+from gnuradio import gr, gru, modulation_utils
+from gnuradio import usrp
+from gnuradio import audio
+from gnuradio import eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+
+from gnuradio.vocoder import gsm_full_rate
+
+import random
+import struct
+
+# from current dir
+from receive_path import receive_path
+import fusb_options
+
+#import os
+#print os.getpid()
+#raw_input('Attach and press enter')
+
+
+class audio_tx(gr.hier_block):
+    def __init__(self, fg, audio_output_dev):
+        self.packet_src = gr.message_source(33)
+        voice_decoder = gsm_full_rate.decode_ps()
+        s2f = gr.short_to_float ()
+        sink_scale = gr.multiply_const_ff(1.0/32767.)
+        audio_sink = audio.sink(8000, audio_output_dev)
+        fg.connect(self.packet_src, voice_decoder, s2f, sink_scale, audio_sink)
+        gr.hier_block.__init__(self, fg, self.packet_src, audio_sink)
+        
+    def msgq(self):
+        return self.packet_src.msgq()
+
+
+class my_graph(gr.flow_graph):
+
+    def __init__(self, demod_class, rx_callback, options):
+        gr.flow_graph.__init__(self)
+        self.rxpath = receive_path(self, demod_class, rx_callback, options)
+        self.audio_tx = audio_tx(self, options.audio_output)
+        
+
+# /////////////////////////////////////////////////////////////////////////////
+#                                   main
+# /////////////////////////////////////////////////////////////////////////////
+
+global n_rcvd, n_right
+
+def main():
+    global n_rcvd, n_right
+
+    n_rcvd = 0
+    n_right = 0
+    
+    def rx_callback(ok, payload):
+        global n_rcvd, n_right
+        n_rcvd += 1
+        if ok:
+            n_right += 1
+
+        fg.audio_tx.msgq().insert_tail(gr.message_from_string(payload))
+        
+        print "ok = %r  n_rcvd = %4d  n_right = %4d" % (
+            ok, n_rcvd, n_right)
+
+    demods = modulation_utils.type_1_demods()
+
+    # Create Options Parser:
+    parser = OptionParser (option_class=eng_option, conflict_handler="resolve")
+    expert_grp = parser.add_option_group("Expert")
+
+    parser.add_option("-m", "--modulation", type="choice", choices=demods.keys(), 
+                      default='gmsk',
+                      help="Select modulation from: %s [default=%%default]"
+                            % (', '.join(demods.keys()),))
+    parser.add_option("-O", "--audio-output", type="string", default="",
+                      help="pcm output device name.  E.g., hw:0,0 or /dev/dsp")
+
+    receive_path.add_options(parser, expert_grp)
+
+    for mod in demods.values():
+        mod.add_options(expert_grp)
+
+    fusb_options.add_options(expert_grp)
+
+    parser.set_defaults(bitrate=50e3)  # override default bitrate default
+    (options, args) = parser.parse_args ()
+
+    if len(args) != 0:
+        parser.print_help(sys.stderr)
+        sys.exit(1)
+
+    if options.rx_freq is None:
+        sys.stderr.write("You must specify -f FREQ or --freq FREQ\n")
+        parser.print_help(sys.stderr)
+        sys.exit(1)
+
+
+    # build the graph
+    fg = my_graph(demods[options.modulation], rx_callback, options)
+
+    r = gr.enable_realtime_scheduling()
+    if r != gr.RT_OK:
+        print "Warning: Failed to enable realtime scheduling."
+
+    fg.start()        # start flow graph
+    fg.wait()         # wait for it to finish
+
+if __name__ == '__main__':
+    try:
+        main()
+    except KeyboardInterrupt:
+        pass