diff options
Diffstat (limited to 'gr-atsc/lib/qa_atsci_viterbi_decoder.cc')
| -rw-r--r-- | gr-atsc/lib/qa_atsci_viterbi_decoder.cc | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/gr-atsc/lib/qa_atsci_viterbi_decoder.cc b/gr-atsc/lib/qa_atsci_viterbi_decoder.cc new file mode 100644 index 0000000000..cd19804765 --- /dev/null +++ b/gr-atsc/lib/qa_atsci_viterbi_decoder.cc @@ -0,0 +1,178 @@ +/* -*- c++ -*- */ +/* + * Copyright 2002 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 <cppunit/TestAssert.h> +#include "qa_atsci_viterbi_decoder.h" +#include "qa_atsci_trellis_encoder.h" +#include <cstdio> +#include <string.h> +#include <stdlib.h> +#include <time.h> + +#define NELEM(x) (sizeof (x) / sizeof (x[0])) + + +static const int NCODERS = atsci_viterbi_decoder::NCODERS; + +#if 0 +static void +map_to_soft_symbols (atsc_soft_data_segment &out, + const atsc_data_segment &in) +{ + for (unsigned int i = 0; i < NELEM (in.data); i++){ + out.data[i] = in.data[i] * 2 - 7; + } +} +#endif + +static void +pad_decoder_input (atsc_soft_data_segment out[NCODERS]) +{ + memset (out, 0, sizeof (out)); + + // add data segment sync + for (int i = 0; i < NCODERS; i++){ + out[i].data[0] = 5; + out[i].data[1] = -5; + out[i].data[2] = -5; + out[i].data[3] = 5; + out[i].pli.set_regular_seg (false, i); + } +} + +void +qa_atsci_viterbi_decoder::t0 () +{ +#if 0 + atsci_trellis_encoder enc; + atsc_mpeg_packet_rs_encoded encoder_in[NCODERS]; + atsc_data_segment encoder_out[NCODERS]; + atsc_soft_data_segment decoder_in[NCODERS]; + atsc_soft_data_segment decoder_in_pad[NCODERS]; + atsc_mpeg_packet_rs_encoded decoder_out[NCODERS]; + atsc_mpeg_packet_rs_encoded decoder_out_pad[NCODERS]; + + + memset (encoder_in, 0, sizeof (encoder_in)); + memset (encoder_out, 0, sizeof (encoder_out)); + memset (decoder_out_pad, 0, sizeof (decoder_out_pad)); + + srandom (1); + + for (int i = 0; i < NCODERS; i++){ + for (unsigned int j = 0; j < NELEM (encoder_in[i].data); j++){ + int t = (random () >> 8) & 0xff; // 8 random bits + encoder_in[i].data[j] = t; + } + } + + fflush (stdout); + printf ("@@@ ENCODER INPUT @@@\n"); + for (int i = 0; i < NCODERS; i++){ + for (unsigned int j = 0; j < NELEM (encoder_in[i].data); j++){ + printf ("%d\n", encoder_in[i].data[j]); + } + } + + enc.reset (); + enc.encode (encoder_out, encoder_in); + + printf ("@@@ ENCODER OUTPUT @@@\n"); + for (int i = 0; i < NCODERS; i++){ + for (unsigned int j = 0; j < NELEM (encoder_out[i].data); j++){ + printf ("%d\n", encoder_out[i].data[j]); + } + } + + for (int i = 0; i < NCODERS; i++) + map_to_soft_symbols (decoder_in[i], encoder_out[i]); + + viterbi.reset (); + + // this has only the previous (non-existant) output + viterbi.decode (decoder_out_pad, decoder_in); + + // now we'll see the real output + pad_decoder_input (decoder_in_pad); + viterbi.decode (decoder_out, decoder_in_pad); + + printf ("@@@ DECODER OUTPUT @@@\n"); + for (int i = 0; i < NCODERS; i++){ + for (unsigned int j = 0; j < NELEM (decoder_out[i].data); j++){ + printf ("%d\n", decoder_out[i].data[j]); + } + } + fflush (stdout); +#endif +} + +void +qa_atsci_viterbi_decoder::t1 () +{ + atsc_soft_data_segment decoder_in[NCODERS]; + atsc_soft_data_segment decoder_in_pad[NCODERS]; + atsc_mpeg_packet_rs_encoded decoder_out[NCODERS]; + atsc_mpeg_packet_rs_encoded decoder_out_pad[NCODERS]; + atsc_mpeg_packet_rs_encoded expected_out[NCODERS]; + static const float raw_input[NCODERS * NELEM (decoder_in[0].data)] = { +#include "qa_atsci_viterbi_decoder_t1_input.dat" + }; + static const unsigned char raw_output[NCODERS * NELEM (expected_out[0].data)] = { +#include "qa_atsci_viterbi_decoder_t1_output.dat" + }; + + + // load up input + const float *ri = &raw_input[0]; + for (int i = 0; i < NCODERS; i++){ + for (unsigned int j = 0; j < NELEM (decoder_in[i].data); j++){ + decoder_in[i].data[j] = *ri++; + } + decoder_in[i].pli.set_regular_seg (false, i); + } + + // load up expected output + const unsigned char *ro = &raw_output[0]; + for (int i = 0; i < NCODERS; i++){ + for (unsigned int j = 0; j < NELEM (expected_out[i].data); j++){ + expected_out[i].data[j] = *ro++; + } + expected_out[i].pli.set_regular_seg (false, i); + } + + viterbi.reset (); + + // this has only the previous (non-existant) output + viterbi.decode (decoder_out_pad, decoder_in); + + // now we'll see the real output + pad_decoder_input (decoder_in_pad); + viterbi.decode (decoder_out, decoder_in_pad); + + for (int i = 0; i < NCODERS; i++){ // check the result + CPPUNIT_ASSERT (expected_out[i] == decoder_out[i]); + } +} |