def main(args):
nargs = len(args)
if nargs == 1:
infile = args[0]
outfile = None
elif nargs == 2:
infile = args[0]
outfile = args[1]
else:
sys.stderr.write("Usage: dvbt-hackrf.py infile [output_file]\n");
sys.exit(1)
## Config Options
config = DVBTConfig('dvbt-hackrf.conf')
# DVB-T Parameters
channel_mhz = config.get_channel_mhz()
mode = config.get_mode()
code_rate = config.get_code_rate()
constellation = config.get_constellation()
guard_interval = config.get_guard_interval()
# Hack-RF Parameters
center_freq = config.get_center_freq()
rf_gain = config.get_rf_gain()
if_gain = config.get_if_gain()
bb_gain = config.get_bb_gain()
##
samp_rate = channel_mhz * 8000000.0 / 7
if mode == dvbt.T2k:
factor = 1
carriers = 2048
elif mode == dvbt.T8k:
factor = 4
carriers = 8192
if guard_interval == dvbt.G1_32:
gi = carriers / 32
elif guard_interval == dvbt.G1_16:
gi = carriers / 16
elif guard_interval == dvbt.G1_8:
gi = carriers / 8
elif guard_interval == dvbt.G1_4:
gi = carriers / 4
if channel_mhz == 8:
bandwidth = 8750000
elif channel_mhz == 7:
bandwidth = 7000000
elif channel_mhz == 6:
bandwidth = 6000000
elif channel_mhz == 5:
bandwidth = 5000000
else:
bandwidth = 8750000
log=gr.logger("dvbt-hackrf")
log.set_level("DEBUG");
log.debug("logger initilized")
tb = gr.top_block()
log.debug("top block initialized")
src = blocks.file_source(gr.sizeof_char, infile, True)
log.debug("source block initialized")
dvbt_energy_dispersal = dvbt.energy_dispersal(1 * factor)
dvbt_reed_solomon_enc = dvbt.reed_solomon_enc(2, 8, 0x11d, 255, 239, 8, 51, (8 * factor))
dvbt_convolutional_interleaver = dvbt.convolutional_interleaver((136 * factor), 12, 17)
dvbt_inner_coder = dvbt.inner_coder(1, (1512 * factor), constellation, dvbt.NH, code_rate)
dvbt_bit_inner_interleaver = dvbt.bit_inner_interleaver((1512 * factor), constellation, dvbt.NH, mode)
dvbt_symbol_inner_interleaver = dvbt.symbol_inner_interleaver((1512 * factor), mode, 1)
dvbt_dvbt_map = dvbt.dvbt_map((1512 * factor), constellation, dvbt.NH, mode, 1)
dvbt_reference_signals = dvbt.reference_signals(gr.sizeof_gr_complex, (1512 * factor), carriers, constellation, dvbt.NH, code_rate, code_rate, dvbt.G1_32, mode, 0, 0)
fft_vxx = fft.fft_vcc(carriers, False, (window.rectangular(carriers)), True, 10)
digital_ofdm_cyclic_prefixer = digital.ofdm_cyclic_prefixer(carriers, carriers+(gi), 0, "")
blocks_multiply_const_vxx = blocks.multiply_const_vcc((0.0022097087 * 2.5, ))
log.debug("DVB-T blocks initialized")
out = osmosdr.sink(args="numchan=1")
out.set_sample_rate(samp_rate)
out.set_center_freq(center_freq, 0)
out.set_freq_corr(0, 0)
out.set_gain(rf_gain, 0)
out.set_if_gain(if_gain, 0)
out.set_bb_gain(bb_gain, 0)
out.set_antenna("", 0)
out.set_bandwidth(bandwidth, 0)
log.debug("Output block initialized")
tb.connect(src, dvbt_energy_dispersal)
tb.connect(dvbt_energy_dispersal, dvbt_reed_solomon_enc)
tb.connect(dvbt_reed_solomon_enc, dvbt_convolutional_interleaver)
tb.connect(dvbt_convolutional_interleaver, dvbt_inner_coder)
tb.connect(dvbt_inner_coder, dvbt_bit_inner_interleaver)
tb.connect(dvbt_bit_inner_interleaver, dvbt_symbol_inner_interleaver)
tb.connect(dvbt_symbol_inner_interleaver, dvbt_dvbt_map)
tb.connect(dvbt_dvbt_map, dvbt_reference_signals)
tb.connect(dvbt_reference_signals, fft_vxx)
tb.connect(fft_vxx, digital_ofdm_cyclic_prefixer)
tb.connect(digital_ofdm_cyclic_prefixer, blocks_multiply_const_vxx)
tb.connect(blocks_multiply_const_vxx, out)
log.debug("all blocks connected")
if outfile:
dst = blocks.file_sink(gr.sizeof_gr_complex, outfile)
tb.connect(blocks_multiply_const_vxx, dst)
log.debug("running gnuradio")
tb.run()
