#!/usr/bin/env python

#

# Copyright 2005-2007,2009,2011 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 3, 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, blks2, audio, uhd

from gnuradio import eng_notation

from gnuradio.eng_option import eng_option

from optparse import OptionParser

from gnuradio import digital

from gnuradio import vocoder

import random

import time

import struct

import sys

# from current dir

from transmit_path import transmit_path

from uhd_interface import uhd_transmitter

#import os

#print os.getpid()

#raw_input('Attach and press enter')

class audio_rx(gr.hier_block2):

    def __init__(self, audio_input_dev):

        gr.hier_block2.__init__(self, "audio_rx",

                                gr.io_signature(0, 0, 0), # Input signature

                                gr.io_signature(0, 0, 0)) # Output signature

        self.sample_rate = sample_rate = 8000

        src = audio.source(sample_rate, audio_input_dev)

        src_scale = gr.multiply_const_ff(32767)

        f2s = gr.float_to_short()

        voice_coder = vocoder.gsm_fr_encode_sp()

        self.packets_from_encoder = gr.msg_queue()

        packet_sink = gr.message_sink(33, self.packets_from_encoder, False)

        self.connect(src, src_scale, f2s, voice_coder, packet_sink)

    def get_encoded_voice_packet(self):

        return self.packets_from_encoder.delete_head()

class my_top_block(gr.top_block):

    def __init__(self, modulator_class, options):

        gr.top_block.__init__(self)

        self.txpath = transmit_path(modulator_class, options)

        self.audio_rx = audio_rx(options.audio_input)

        if(options.tx_freq is not None):

            self.sink = uhd_transmitter(options.address, options.bitrate,

                                        options.samples_per_symbol,

                                        options.tx_freq, options.tx_gain,

                                        options.antenna, options.verbose)

            options.samples_per_symbol = self.sink._sps

            audio_rate = self.audio_rx.sample_rate

            usrp_rate = self.sink.get_sample_rate()

            rrate = usrp_rate / audio_rate

        elif(options.to_file is not None):

            self.sink = gr.file_sink(gr.sizeof_gr_complex, options.to_file)

            rrate = 1

        else:

            self.sink = gr.null_sink(gr.sizeof_gr_complex)

            rrate = 1

        self.resampler = blks2.pfb_arb_resampler_ccf(rrate)

        self.connect(self.audio_rx)

        self.connect(self.txpath, self.resampler, self.sink)

# /////////////////////////////////////////////////////////////////////////////

#                                   main

# /////////////////////////////////////////////////////////////////////////////

def main():

    def send_pkt(payload='', eof=False):

        return tb.txpath.send_pkt(payload, eof)

    def rx_callback(ok, payload):

        print "ok = %r, payload = '%s'" % (ok, payload)

    mods = digital.modulation_utils2.type_1_mods()

    parser = OptionParser(option_class=eng_option, conflict_handler="resolve")

    expert_grp = parser.add_option_group("Expert")

    parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(),

                      default='gmsk',

                      help="Select modulation from: %s [default=%%default]"

                            % (', '.join(mods.keys()),))

    parser.add_option("-M", "--megabytes", type="eng_float", default=0,

                      help="set megabytes to transmit [default=inf]")

    parser.add_option("-I", "--audio-input", type="string", default="",

                      help="pcm input device name.  E.g., hw:0,0 or /dev/dsp")

    parser.add_option("","--to-file", default=None,

                      help="Output file for modulated samples")

    transmit_path.add_options(parser, expert_grp)

    uhd_transmitter.add_options(parser)

    for mod in mods.values():

        mod.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.exit(1)

    if options.to_file is None:

        if options.tx_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

    tb = my_top_block(mods[options.modulation], options)

    r = gr.enable_realtime_scheduling()

    if r != gr.RT_OK:

        print "Warning: failed to enable realtime scheduling"

    tb.start()                       # start flow graph

    # generate and send packets

    nbytes = int(1e6 * options.megabytes)

    n = 0

    pktno = 0

    while nbytes == 0 or n < nbytes:

        packet = tb.audio_rx.get_encoded_voice_packet()

        s = packet.to_string()

        send_pkt(s)

        n += len(s)

        sys.stderr.write('.')

        pktno += 1

    send_pkt(eof=True)

    tb.wait()                       # wait for it to finish

if __name__ == '__main__':

    try:

        main()

    except KeyboardInterrupt:

        pass