forked from Mirrors/freeswitch
528 lines
19 KiB
C
528 lines
19 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* fsk_tests.c - Tests for the low speed FSK modem code (V.21, V.23, etc.).
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2003 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*! \page fsk_tests_page FSK modem tests
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\section fsk_tests_page_sec_1 What does it do?
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These tests allow either:
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- An FSK transmit modem to feed an FSK receive modem, of the same type,
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through a telephone line model. BER testing is then used to evaluate
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performance under various line conditions. This is effective for testing
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the basic performance of the receive modem. It is also the only test mode
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provided for evaluating the transmit modem.
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- An FSK receive modem is used to decode FSK audio, stored in a file.
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This is good way to evaluate performance with audio recorded from other
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models of modem, and with real world problematic telephone lines.
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\section fsk_tests_page_sec_2 How does it work?
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*/
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#if defined(HAVE_CONFIG_H)
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <assert.h>
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#include <sndfile.h>
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#include "spandsp.h"
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#include "spandsp-sim.h"
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#define BLOCK_LEN 160
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#define OUTPUT_FILE_NAME "fsk.wav"
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char *decode_test_file = NULL;
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both_ways_line_model_state_t *model;
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int rx_bits = 0;
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bool cutoff_test_carrier = false;
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static void rx_status(void *user_data, int status)
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{
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printf("FSK rx status is %s (%d)\n", signal_status_to_str(status), status);
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}
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/*- End of function --------------------------------------------------------*/
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static void tx_status(void *user_data, int status)
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{
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printf("FSK tx status is %s (%d)\n", signal_status_to_str(status), status);
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}
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/*- End of function --------------------------------------------------------*/
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static void put_bit(void *user_data, int bit)
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{
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if (bit < 0)
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{
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rx_status(user_data, bit);
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return;
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}
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printf("Rx bit %d - %d\n", rx_bits++, bit);
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}
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/*- End of function --------------------------------------------------------*/
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static void cutoff_test_rx_status(void *user_data, int status)
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{
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printf("FSK rx status is %s (%d)\n", signal_status_to_str(status), status);
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switch (status)
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{
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case SIG_STATUS_CARRIER_UP:
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cutoff_test_carrier = true;
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break;
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case SIG_STATUS_CARRIER_DOWN:
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cutoff_test_carrier = false;
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break;
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}
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}
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/*- End of function --------------------------------------------------------*/
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static void cutoff_test_put_bit(void *user_data, int bit)
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{
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if (bit < 0)
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{
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cutoff_test_rx_status(user_data, bit);
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return;
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}
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}
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/*- End of function --------------------------------------------------------*/
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static void reporter(void *user_data, int reason, bert_results_t *results)
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{
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int channel;
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channel = (int) (intptr_t) user_data;
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switch (reason)
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{
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case BERT_REPORT_SYNCED:
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fprintf(stderr, "%d: BERT report synced\n", channel);
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break;
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case BERT_REPORT_UNSYNCED:
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fprintf(stderr, "%d: BERT report unsync'ed\n", channel);
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break;
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case BERT_REPORT_REGULAR:
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fprintf(stderr, "%d: BERT report regular - %d bits, %d bad bits, %d resyncs\n", channel, results->total_bits, results->bad_bits, results->resyncs);
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break;
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case BERT_REPORT_GT_10_2:
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fprintf(stderr, "%d: BERT report > 1 in 10^2\n", channel);
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break;
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case BERT_REPORT_LT_10_2:
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fprintf(stderr, "%d: BERT report < 1 in 10^2\n", channel);
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break;
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case BERT_REPORT_LT_10_3:
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fprintf(stderr, "%d: BERT report < 1 in 10^3\n", channel);
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break;
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case BERT_REPORT_LT_10_4:
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fprintf(stderr, "%d: BERT report < 1 in 10^4\n", channel);
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break;
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case BERT_REPORT_LT_10_5:
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fprintf(stderr, "%d: BERT report < 1 in 10^5\n", channel);
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break;
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case BERT_REPORT_LT_10_6:
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fprintf(stderr, "%d: BERT report < 1 in 10^6\n", channel);
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break;
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case BERT_REPORT_LT_10_7:
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fprintf(stderr, "%d: BERT report < 1 in 10^7\n", channel);
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break;
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default:
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fprintf(stderr, "%d: BERT report reason %d\n", channel, reason);
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break;
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}
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}
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/*- End of function --------------------------------------------------------*/
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int main(int argc, char *argv[])
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{
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fsk_tx_state_t *caller_tx;
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fsk_rx_state_t *caller_rx;
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fsk_tx_state_t *answerer_tx;
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fsk_rx_state_t *answerer_rx;
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bert_state_t caller_bert;
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bert_state_t answerer_bert;
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bert_results_t bert_results;
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power_meter_t caller_meter;
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power_meter_t answerer_meter;
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int16_t caller_amp[BLOCK_LEN];
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int16_t answerer_amp[BLOCK_LEN];
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int16_t caller_model_amp[BLOCK_LEN];
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int16_t answerer_model_amp[BLOCK_LEN];
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int16_t out_amp[2*BLOCK_LEN];
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SNDFILE *inhandle;
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SNDFILE *outhandle;
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int outframes;
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int i;
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int j;
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int samples;
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int test_bps;
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int noise_level;
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int noise_sweep;
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int bits_per_test;
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int line_model_no;
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int modem_under_test_1;
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int modem_under_test_2;
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int modems_set;
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int channel_codec;
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int rbs_pattern;
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int on_at;
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int off_at;
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int opt;
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bool log_audio;
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tone_gen_descriptor_t tone_desc;
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tone_gen_state_t tone_tx;
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channel_codec = MUNGE_CODEC_NONE;
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rbs_pattern = 0;
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line_model_no = 0;
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decode_test_file = NULL;
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noise_sweep = false;
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modem_under_test_1 = FSK_V21CH1;
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modem_under_test_2 = FSK_V21CH2;
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log_audio = false;
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modems_set = 0;
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while ((opt = getopt(argc, argv, "c:d:lm:nr:s:")) != -1)
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{
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switch (opt)
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{
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case 'c':
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channel_codec = atoi(optarg);
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break;
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case 'd':
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decode_test_file = optarg;
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break;
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case 'l':
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log_audio = true;
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break;
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case 'm':
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line_model_no = atoi(optarg);
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break;
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case 'n':
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noise_sweep = true;
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break;
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case 'r':
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rbs_pattern = atoi(optarg);
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break;
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case 's':
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switch (modems_set++)
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{
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case 0:
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modem_under_test_1 = atoi(optarg);
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break;
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case 1:
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modem_under_test_2 = atoi(optarg);
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break;
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}
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break;
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default:
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//usage();
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exit(2);
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break;
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}
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}
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if (modem_under_test_1 >= 0)
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printf("Modem channel 1 is '%s'\n", preset_fsk_specs[modem_under_test_1].name);
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if (modem_under_test_2 >= 0)
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printf("Modem channel 2 is '%s'\n", preset_fsk_specs[modem_under_test_2].name);
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outhandle = NULL;
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if (log_audio)
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{
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if ((outhandle = sf_open_telephony_write(OUTPUT_FILE_NAME, 2)) == NULL)
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{
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fprintf(stderr, " Cannot create audio file '%s'\n", OUTPUT_FILE_NAME);
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exit(2);
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}
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}
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noise_level = -200;
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bits_per_test = 0;
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inhandle = NULL;
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memset(caller_amp, 0, sizeof(*caller_amp));
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memset(answerer_amp, 0, sizeof(*answerer_amp));
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memset(caller_model_amp, 0, sizeof(*caller_model_amp));
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memset(answerer_model_amp, 0, sizeof(*answerer_model_amp));
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power_meter_init(&caller_meter, 7);
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power_meter_init(&answerer_meter, 7);
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if (decode_test_file)
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{
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if ((inhandle = sf_open_telephony_read(decode_test_file, 1)) == NULL)
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{
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fprintf(stderr, " Cannot open audio file '%s'\n", decode_test_file);
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exit(2);
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}
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caller_rx = fsk_rx_init(NULL, &preset_fsk_specs[modem_under_test_1], FSK_FRAME_MODE_SYNC, put_bit, NULL);
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fsk_rx_set_modem_status_handler(caller_rx, rx_status, (void *) &caller_rx);
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test_bps = preset_fsk_specs[modem_under_test_1].baud_rate;
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for (;;)
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{
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samples = sf_readf_short(inhandle, caller_model_amp, BLOCK_LEN);
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if (samples < BLOCK_LEN)
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break;
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for (i = 0; i < samples; i++)
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power_meter_update(&caller_meter, caller_model_amp[i]);
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fsk_rx(caller_rx, caller_model_amp, samples);
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}
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if (sf_close_telephony(inhandle))
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{
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fprintf(stderr, " Cannot close audio file '%s'\n", decode_test_file);
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exit(2);
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}
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}
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else
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{
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printf("Test cutoff level\n");
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caller_rx = fsk_rx_init(NULL, &preset_fsk_specs[modem_under_test_1], FSK_FRAME_MODE_SYNC, cutoff_test_put_bit, NULL);
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fsk_rx_signal_cutoff(caller_rx, -30.0f);
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fsk_rx_set_modem_status_handler(caller_rx, cutoff_test_rx_status, (void *) &caller_rx);
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on_at = 0;
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for (i = -40; i < -25; i++)
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{
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tone_gen_descriptor_init(&tone_desc,
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1500,
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i,
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0,
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0,
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1,
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0,
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0,
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0,
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true);
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tone_gen_init(&tone_tx, &tone_desc);
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for (j = 0; j < 10; j++)
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{
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samples = tone_gen(&tone_tx, caller_model_amp, 160);
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fsk_rx(caller_rx, caller_model_amp, samples);
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}
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if (cutoff_test_carrier)
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break;
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}
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on_at = i;
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off_at = 0;
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for ( ; i > -40; i--)
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{
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tone_gen_descriptor_init(&tone_desc,
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1500,
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i,
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0,
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0,
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1,
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0,
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0,
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0,
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true);
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tone_gen_init(&tone_tx, &tone_desc);
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for (j = 0; j < 10; j++)
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{
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samples = tone_gen(&tone_tx, caller_model_amp, 160);
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fsk_rx(caller_rx, caller_model_amp, samples);
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}
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if (!cutoff_test_carrier)
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break;
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}
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off_at = i;
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printf("Carrier on at %d, off at %d\n", on_at, off_at);
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if (on_at < -29 || on_at > -26
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||
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off_at < -35 || off_at > -31)
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{
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printf("Tests failed.\n");
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exit(2);
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}
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printf("Test with BERT\n");
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test_bps = preset_fsk_specs[modem_under_test_1].baud_rate;
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if (modem_under_test_1 >= 0)
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{
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caller_tx = fsk_tx_init(NULL, &preset_fsk_specs[modem_under_test_1], (get_bit_func_t) bert_get_bit, &caller_bert);
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fsk_tx_set_modem_status_handler(caller_tx, tx_status, (void *) &caller_tx);
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answerer_rx = fsk_rx_init(NULL, &preset_fsk_specs[modem_under_test_1], FSK_FRAME_MODE_SYNC, (put_bit_func_t) bert_put_bit, &answerer_bert);
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fsk_rx_set_modem_status_handler(answerer_rx, rx_status, (void *) &answerer_rx);
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}
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if (modem_under_test_2 >= 0)
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{
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answerer_tx = fsk_tx_init(NULL, &preset_fsk_specs[modem_under_test_2], (get_bit_func_t) bert_get_bit, &answerer_bert);
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fsk_tx_set_modem_status_handler(answerer_tx, tx_status, (void *) &answerer_tx);
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caller_rx = fsk_rx_init(NULL, &preset_fsk_specs[modem_under_test_2], FSK_FRAME_MODE_SYNC, (put_bit_func_t) bert_put_bit, &caller_bert);
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fsk_rx_set_modem_status_handler(caller_rx, rx_status, (void *) &caller_rx);
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}
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test_bps = preset_fsk_specs[modem_under_test_1].baud_rate;
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bits_per_test = 500000;
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noise_level = -24;
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bert_init(&caller_bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
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bert_set_report(&caller_bert, 100000, reporter, (void *) (intptr_t) 1);
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bert_init(&answerer_bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
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bert_set_report(&answerer_bert, 100000, reporter, (void *) (intptr_t) 2);
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if ((model = both_ways_line_model_init(line_model_no,
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(float) noise_level,
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-15.0f,
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-15.0f,
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line_model_no,
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(float) noise_level,
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-15.0f,
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-15.0f,
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channel_codec,
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rbs_pattern)) == NULL)
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{
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fprintf(stderr, " Failed to create line model\n");
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exit(2);
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}
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for (;;)
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{
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samples = fsk_tx(caller_tx, caller_amp, BLOCK_LEN);
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for (i = 0; i < samples; i++)
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power_meter_update(&caller_meter, caller_amp[i]);
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samples = fsk_tx(answerer_tx, answerer_amp, BLOCK_LEN);
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for (i = 0; i < samples; i++)
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power_meter_update(&answerer_meter, answerer_amp[i]);
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both_ways_line_model(model,
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caller_model_amp,
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caller_amp,
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answerer_model_amp,
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answerer_amp,
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samples);
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//printf("Powers %10.5fdBm0 %10.5fdBm0\n", power_meter_current_dbm0(&caller_meter), power_meter_current_dbm0(&answerer_meter));
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fsk_rx(answerer_rx, caller_model_amp, samples);
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for (i = 0; i < samples; i++)
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out_amp[2*i] = caller_model_amp[i];
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for ( ; i < BLOCK_LEN; i++)
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out_amp[2*i] = 0;
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fsk_rx(caller_rx, answerer_model_amp, samples);
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for (i = 0; i < samples; i++)
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out_amp[2*i + 1] = answerer_model_amp[i];
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for ( ; i < BLOCK_LEN; i++)
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out_amp[2*i + 1] = 0;
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if (log_audio)
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{
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outframes = sf_writef_short(outhandle, out_amp, BLOCK_LEN);
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if (outframes != BLOCK_LEN)
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{
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fprintf(stderr, " Error writing audio file\n");
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exit(2);
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}
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}
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if (samples < BLOCK_LEN)
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{
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bert_result(&caller_bert, &bert_results);
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fprintf(stderr, "%ddB AWGN, %d bits, %d bad bits, %d resyncs\n", noise_level, bert_results.total_bits, bert_results.bad_bits, bert_results.resyncs);
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if (!noise_sweep)
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{
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if (bert_results.total_bits != bits_per_test - 43
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||
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bert_results.bad_bits != 0
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||
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bert_results.resyncs != 0)
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{
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printf("Tests failed.\n");
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exit(2);
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}
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}
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bert_result(&answerer_bert, &bert_results);
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fprintf(stderr, "%ddB AWGN, %d bits, %d bad bits, %d resyncs\n", noise_level, bert_results.total_bits, bert_results.bad_bits, bert_results.resyncs);
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if (!noise_sweep)
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{
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if (bert_results.total_bits != bits_per_test - 43
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||
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bert_results.bad_bits != 0
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||
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bert_results.resyncs != 0)
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{
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printf("Tests failed.\n");
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exit(2);
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}
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break;
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}
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/* Put a little silence between the chunks in the file. */
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memset(out_amp, 0, sizeof(out_amp));
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if (log_audio)
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{
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for (i = 0; i < 200; i++)
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outframes = sf_writef_short(outhandle, out_amp, BLOCK_LEN);
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}
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|
if (modem_under_test_1 >= 0)
|
|
{
|
|
caller_tx = fsk_tx_init(NULL, &preset_fsk_specs[modem_under_test_1], (get_bit_func_t) bert_get_bit, &caller_bert);
|
|
fsk_tx_set_modem_status_handler(caller_tx, tx_status, (void *) &caller_tx);
|
|
answerer_rx = fsk_rx_init(NULL, &preset_fsk_specs[modem_under_test_1], FSK_FRAME_MODE_SYNC, (put_bit_func_t) bert_put_bit, &answerer_bert);
|
|
fsk_rx_set_modem_status_handler(answerer_rx, rx_status, (void *) &answerer_rx);
|
|
}
|
|
if (modem_under_test_2 >= 0)
|
|
{
|
|
answerer_tx = fsk_tx_init(NULL, &preset_fsk_specs[modem_under_test_2], (get_bit_func_t) bert_get_bit, &answerer_bert);
|
|
fsk_tx_set_modem_status_handler(answerer_tx, tx_status, (void *) &answerer_tx);
|
|
caller_rx = fsk_rx_init(NULL, &preset_fsk_specs[modem_under_test_2], FSK_FRAME_MODE_SYNC, (put_bit_func_t) bert_put_bit, &caller_bert);
|
|
fsk_rx_set_modem_status_handler(caller_rx, rx_status, (void *) &caller_rx);
|
|
}
|
|
noise_level++;
|
|
if ((model = both_ways_line_model_init(line_model_no,
|
|
(float) noise_level,
|
|
line_model_no,
|
|
-15.0f,
|
|
-15.0f,
|
|
noise_level,
|
|
channel_codec,
|
|
-15.0f,
|
|
-15.0f,
|
|
0)) == NULL)
|
|
{
|
|
fprintf(stderr, " Failed to create line model\n");
|
|
exit(2);
|
|
}
|
|
bert_init(&caller_bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
|
|
bert_set_report(&caller_bert, 100000, reporter, (void *) (intptr_t) 1);
|
|
bert_init(&answerer_bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
|
|
bert_set_report(&answerer_bert, 100000, reporter, (void *) (intptr_t) 2);
|
|
}
|
|
}
|
|
printf("Tests passed.\n");
|
|
}
|
|
if (log_audio)
|
|
{
|
|
if (sf_close_telephony(outhandle))
|
|
{
|
|
fprintf(stderr, " Cannot close audio file '%s'\n", OUTPUT_FILE_NAME);
|
|
exit(2);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
/*- End of file ------------------------------------------------------------*/
|