diff options
Diffstat (limited to 'gr-atsc/src/lib/atsc_bit_timing_loop.cc')
| -rw-r--r-- | gr-atsc/src/lib/atsc_bit_timing_loop.cc | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/gr-atsc/src/lib/atsc_bit_timing_loop.cc b/gr-atsc/src/lib/atsc_bit_timing_loop.cc deleted file mode 100644 index dc43d28bc..000000000 --- a/gr-atsc/src/lib/atsc_bit_timing_loop.cc +++ /dev/null @@ -1,125 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2006,2010 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. - */ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif - -#include <atsc_bit_timing_loop.h> -#include <gr_io_signature.h> -#include <atsc_consts.h> -#include <string.h> - -// Input rate changed from 20MHz to 19.2 to support usrp at 3 * 6.4MHz -float input_rate = 19.2e6; -double ratio_of_rx_clock_to_symbol_freq = input_rate / ATSC_SYMBOL_RATE; - - -atsc_bit_timing_loop_sptr -atsc_make_bit_timing_loop() -{ - return gnuradio::get_initial_sptr(new atsc_bit_timing_loop()); -} - - -atsc_bit_timing_loop::atsc_bit_timing_loop() - : gr_block("atsc_bit_timing_loop", - gr_make_io_signature(1, 1, sizeof(float)), - gr_make_io_signature3(2, 3, sizeof(float), sizeof(float), sizeof(float))), - d_interp(ratio_of_rx_clock_to_symbol_freq), d_next_input(0), - d_rx_clock_to_symbol_freq (ratio_of_rx_clock_to_symbol_freq), - d_si(0) -{ - reset(); -} - -void -atsc_bit_timing_loop::forecast (int noutput_items, gr_vector_int &ninput_items_required) -{ - unsigned ninputs = ninput_items_required.size(); - for (unsigned i = 0; i < ninputs; i++) - ninput_items_required[i] = static_cast<int>(noutput_items * d_rx_clock_to_symbol_freq) + 1500 - 1; - -} - -int -atsc_bit_timing_loop::general_work (int noutput_items, - gr_vector_int &ninput_items, - gr_vector_const_void_star &input_items, - gr_vector_void_star &output_items) -{ - int r = work (noutput_items, input_items, output_items); - if (r > 0) - consume_each (d_si); - return r; -} - - -int -atsc_bit_timing_loop::work (int noutput_items, - gr_vector_const_void_star &input_items, - gr_vector_void_star &output_items) -{ - const float *in = (const float *) input_items[0]; - float *out_sample = (float *) output_items[0]; - atsc::syminfo *out_tag = (atsc::syminfo *) output_items[1]; - float *out_timing_error = (float *) output_items[2]; - - assert(sizeof(float) == sizeof(atsc::syminfo)); - - // We are tasked with producing output.size output samples. - // We will consume approximately 2 * output.size input samples. - - int k; // output index - - float interp_sample; - int symbol_index; - double timing_adjustment = 0; - bool seg_locked; - atsc::syminfo tag; - // ammount requested in forecast - unsigned long input_size = noutput_items * d_rx_clock_to_symbol_freq + 1500 -1; - - memset (&tag, 0, sizeof (tag)); - - // ammount actually consumed - d_si = 0; - - for (k = 0; k < noutput_items; k++){ - if (!d_interp.update (in, input_size, &d_si, timing_adjustment, &interp_sample)){ - fprintf (stderr, "GrAtscBitTimingLoop3: ran short on data...\n"); - break; - } - - d_sssr.update (interp_sample, &seg_locked, &symbol_index, &timing_adjustment); - if (output_items.size() == 3) { - out_timing_error[k] = timing_adjustment; - } - out_sample[k] = interp_sample; - tag.valid = seg_locked; - tag.symbol_num = symbol_index; - out_tag[k] = tag; - - } - - return k; -} |