forked from Mirrors/freeswitch
612 lines
20 KiB
C
612 lines
20 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* v27ter_tests.c
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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 v27ter_tests_page V.27ter modem tests
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\section v27ter_tests_page_sec_1 What does it do?
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These tests test one way paths, as V.27ter is a half-duplex modem. They allow either:
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- A V.27ter transmit modem to feed a V.27ter receive modem through a telephone line
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model. BER testing is then used to evaluate performance under various line
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conditions. This is effective for testing the basic performance of the
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receive modem. It is also the only test mode provided for evaluating the
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transmit modem.
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- A V.27ter receive modem is used to decode V.27ter audio, stored in an audio 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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If the appropriate GUI environment exists, the tests are built such that a visual
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display of modem status is maintained.
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\section v27ter_tests_page_sec_2 How is it used?
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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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#if defined(HAVE_FL_FL_H) && defined(HAVE_FL_FL_CARTESIAN_H) && defined(HAVE_FL_FL_AUDIO_METER_H)
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#define ENABLE_GUI
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <sndfile.h>
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#include <signal.h>
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#if defined(HAVE_FENV_H)
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#define __USE_GNU
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#include <fenv.h>
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#endif
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#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
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#include "spandsp.h"
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#include "spandsp-sim.h"
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#if defined(ENABLE_GUI)
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#include "modem_monitor.h"
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#include "line_model_monitor.h"
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#endif
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#define BLOCK_LEN 160
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#define OUT_FILE_NAME "v27ter.wav"
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char *decode_test_file = NULL;
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bool use_gui = false;
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int symbol_no = 0;
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int rx_bits = 0;
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bert_state_t bert;
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one_way_line_model_state_t *line_model;
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#if defined(ENABLE_GUI)
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qam_monitor_t *qam_monitor;
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#endif
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bert_results_t latest_results;
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static void reporter(void *user_data, int reason, bert_results_t *results)
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{
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switch (reason)
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{
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case BERT_REPORT_REGULAR:
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fprintf(stderr, "BERT report regular - %d bits, %d bad bits, %d resyncs\n", results->total_bits, results->bad_bits, results->resyncs);
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memcpy(&latest_results, results, sizeof(latest_results));
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break;
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default:
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fprintf(stderr, "BERT report %s\n", bert_event_to_str(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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static void v27ter_rx_status(void *user_data, int status)
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{
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v27ter_rx_state_t *s;
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int i;
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int len;
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#if defined(SPANDSP_USE_FIXED_POINT)
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complexi16_t *coeffs;
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#else
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complexf_t *coeffs;
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#endif
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printf("V.27ter rx status is %s (%d)\n", signal_status_to_str(status), status);
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s = (v27ter_rx_state_t *) user_data;
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switch (status)
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{
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case SIG_STATUS_TRAINING_SUCCEEDED:
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if ((len = v27ter_rx_equalizer_state(s, &coeffs)))
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{
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printf("Equalizer:\n");
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for (i = 0; i < len; i++)
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#if defined(SPANDSP_USE_FIXED_POINT)
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printf("%3d (%15.5f, %15.5f)\n", i, coeffs[i].re/V27TER_CONSTELLATION_SCALING_FACTOR, coeffs[i].im/V27TER_CONSTELLATION_SCALING_FACTOR);
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#else
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printf("%3d (%15.5f, %15.5f) -> %15.5f\n", i, coeffs[i].re, coeffs[i].im, powerf(&coeffs[i]));
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#endif
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}
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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 v27terputbit(void *user_data, int bit)
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{
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if (bit < 0)
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{
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v27ter_rx_status(user_data, bit);
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return;
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}
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if (decode_test_file)
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printf("Rx bit %d - %d\n", rx_bits++, bit);
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else
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bert_put_bit(&bert, bit);
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}
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/*- End of function --------------------------------------------------------*/
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static void v27ter_tx_status(void *user_data, int status)
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{
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printf("V.27ter 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 int v27tergetbit(void *user_data)
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{
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return bert_get_bit(&bert);
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}
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/*- End of function --------------------------------------------------------*/
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#if defined(SPANDSP_USE_FIXED_POINT)
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static void qam_report(void *user_data, const complexi16_t *constel, const complexi16_t *target, int symbol)
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#else
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static void qam_report(void *user_data, const complexf_t *constel, const complexf_t *target, int symbol)
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#endif
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{
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int i;
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int len;
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#if defined(SPANDSP_USE_FIXED_POINT)
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complexi16_t *coeffs;
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#else
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complexf_t *coeffs;
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#endif
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complexf_t constel_point;
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complexf_t target_point;
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float fpower;
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float error;
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v27ter_rx_state_t *rx;
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static float smooth_power = 0.0f;
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static int update_interval = 100;
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rx = (v27ter_rx_state_t *) user_data;
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if (constel)
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{
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constel_point.re = constel->re/V27TER_CONSTELLATION_SCALING_FACTOR;
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constel_point.im = constel->im/V27TER_CONSTELLATION_SCALING_FACTOR;
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target_point.re = target->re/V27TER_CONSTELLATION_SCALING_FACTOR;
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target_point.im = target->im/V27TER_CONSTELLATION_SCALING_FACTOR;
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fpower = (constel_point.re - target_point.re)*(constel_point.re - target_point.re)
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+ (constel_point.im - target_point.im)*(constel_point.im - target_point.im);
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smooth_power = 0.95f*smooth_power + 0.05f*fpower;
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#if defined(ENABLE_GUI)
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if (use_gui)
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{
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qam_monitor_update_constel(qam_monitor, &constel_point);
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qam_monitor_update_carrier_tracking(qam_monitor, v27ter_rx_carrier_frequency(rx));
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qam_monitor_update_symbol_tracking(qam_monitor, v27ter_rx_symbol_timing_correction(rx));
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}
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#endif
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error = constel->im*target->re - constel->re*target->im;
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printf("Tracking error %f %f %f %f %f %f\n", error, v27ter_rx_carrier_frequency(rx), constel_point.re, constel_point.im, target_point.re, target_point.im);
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printf("%8d [%8.4f, %8.4f] [%8.4f, %8.4f] %2x %8.4f %8.4f %9.4f %7.3f %7.4f\n",
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symbol_no,
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constel_point.re,
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constel_point.im,
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target_point.re,
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target_point.im,
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symbol,
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fpower,
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smooth_power,
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v27ter_rx_carrier_frequency(rx),
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v27ter_rx_signal_power(rx),
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v27ter_rx_symbol_timing_correction(rx));
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symbol_no++;
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if (--update_interval <= 0)
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{
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if ((len = v27ter_rx_equalizer_state(rx, &coeffs)))
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{
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printf("Equalizer B:\n");
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for (i = 0; i < len; i++)
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#if defined(SPANDSP_USE_FIXED_POINT)
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printf("%3d (%15.5f, %15.5f)\n", i, coeffs[i].re/V27TER_CONSTELLATION_SCALING_FACTOR, coeffs[i].im/V27TER_CONSTELLATION_SCALING_FACTOR);
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#else
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printf("%3d (%15.5f, %15.5f) -> %15.5f\n", i, coeffs[i].re, coeffs[i].im, powerf(&coeffs[i]));
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#endif
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#if defined(ENABLE_GUI)
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if (use_gui)
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{
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#if defined(SPANDSP_USE_FIXED_POINT)
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qam_monitor_update_int_equalizer(qam_monitor, coeffs, len);
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#else
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qam_monitor_update_equalizer(qam_monitor, coeffs, len);
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#endif
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}
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#endif
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}
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update_interval = 100;
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}
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}
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else
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{
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printf("Gardner step %d\n", symbol);
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if ((len = v27ter_rx_equalizer_state(rx, &coeffs)))
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{
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printf("Equalizer A:\n");
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for (i = 0; i < len; i++)
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#if defined(SPANDSP_USE_FIXED_POINT)
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printf("%3d (%15.5f, %15.5f)\n", i, coeffs[i].re/V27TER_CONSTELLATION_SCALING_FACTOR, coeffs[i].im/V27TER_CONSTELLATION_SCALING_FACTOR);
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#else
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printf("%3d (%15.5f, %15.5f) -> %15.5f\n", i, coeffs[i].re, coeffs[i].im, powerf(&coeffs[i]));
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#endif
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#if defined(ENABLE_GUI)
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if (use_gui)
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{
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#if defined(SPANDSP_USE_FIXED_POINT)
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qam_monitor_update_int_equalizer(qam_monitor, coeffs, len);
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#else
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qam_monitor_update_equalizer(qam_monitor, coeffs, len);
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#endif
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}
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#endif
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}
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}
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}
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/*- End of function --------------------------------------------------------*/
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#if defined(HAVE_FENV_H)
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static void sigfpe_handler(int sig_num, siginfo_t *info, void *data)
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{
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switch (sig_num)
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{
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case SIGFPE:
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switch (info->si_code)
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{
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case FPE_INTDIV:
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fprintf(stderr, "integer divide by zero at %p\n", info->si_addr);
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break;
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case FPE_INTOVF:
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fprintf(stderr, "integer overflow at %p\n", info->si_addr);
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break;
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case FPE_FLTDIV:
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fprintf(stderr, "FP divide by zero at %p\n", info->si_addr);
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break;
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case FPE_FLTOVF:
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fprintf(stderr, "FP overflow at %p\n", info->si_addr);
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break;
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case FPE_FLTUND:
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fprintf(stderr, "FP underflow at %p\n", info->si_addr);
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break;
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case FPE_FLTRES:
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fprintf(stderr, "FP inexact result at %p\n", info->si_addr);
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break;
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case FPE_FLTINV:
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fprintf(stderr, "FP invalid operation at %p\n", info->si_addr);
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break;
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case FPE_FLTSUB:
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fprintf(stderr, "subscript out of range at %p\n", info->si_addr);
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break;
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}
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break;
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default:
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fprintf(stderr, "Unexpected signal %d\n", sig_num);
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break;
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}
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exit(2);
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}
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/*- End of function --------------------------------------------------------*/
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static void fpe_trap_setup(void)
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{
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struct sigaction trap;
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sigemptyset(&trap.sa_mask);
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trap.sa_flags = SA_SIGINFO;
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trap.sa_sigaction = sigfpe_handler;
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sigaction(SIGFPE, &trap, NULL);
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//feenableexcept(FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW);
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//feenableexcept(FE_ALL_EXCEPT);
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feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
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}
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/*- End of function --------------------------------------------------------*/
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#endif
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int main(int argc, char *argv[])
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{
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v27ter_rx_state_t *rx;
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v27ter_tx_state_t *tx;
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bert_results_t bert_results;
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int16_t gen_amp[BLOCK_LEN];
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int16_t amp[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 samples;
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int test_bps;
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int noise_level;
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int signal_level;
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int bits_per_test;
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int line_model_no;
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int block_no;
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int channel_codec;
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int rbs_pattern;
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int opt;
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bool tep;
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bool log_audio;
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logging_state_t *logging;
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channel_codec = MUNGE_CODEC_NONE;
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rbs_pattern = 0;
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test_bps = 4800;
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tep = false;
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line_model_no = 0;
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decode_test_file = NULL;
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use_gui = false;
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noise_level = -70;
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signal_level = -13;
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bits_per_test = 50000;
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log_audio = false;
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while ((opt = getopt(argc, argv, "b:B:c:d:glm:n:r:s:t")) != -1)
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{
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switch (opt)
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{
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case 'b':
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test_bps = atoi(optarg);
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if (test_bps != 4800 && test_bps != 2400)
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{
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fprintf(stderr, "Invalid bit rate specified\n");
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exit(2);
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}
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break;
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case 'B':
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bits_per_test = atoi(optarg);
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break;
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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 'g':
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#if defined(ENABLE_GUI)
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use_gui = true;
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#else
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fprintf(stderr, "Graphical monitoring not available\n");
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exit(2);
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#endif
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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_level = atoi(optarg);
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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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signal_level = atoi(optarg);
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break;
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case 't':
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tep = true;
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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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inhandle = NULL;
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outhandle = NULL;
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#if defined(HAVE_FENV_H)
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fpe_trap_setup();
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#endif
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if (log_audio)
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{
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if ((outhandle = sf_open_telephony_write(OUT_FILE_NAME, 1)) == NULL)
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{
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fprintf(stderr, " Cannot create audio file '%s'\n", OUT_FILE_NAME);
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exit(2);
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}
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}
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if (decode_test_file)
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{
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/* We will decode the audio from a file. */
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tx = NULL;
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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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}
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else
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{
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/* We will generate V.27ter audio, and add some noise to it. */
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tx = v27ter_tx_init(NULL, test_bps, tep, v27tergetbit, NULL);
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logging = v27ter_tx_get_logging_state(tx);
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span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
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span_log_set_tag(logging, "V.27ter-tx");
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v27ter_tx_power(tx, signal_level);
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v27ter_tx_set_modem_status_handler(tx, v27ter_tx_status, (void *) tx);
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/* Move the carrier off a bit */
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#if defined(SPANDSP_EXPOSE_INTERNAL_STRUCTURES)
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tx->carrier_phase_rate = dds_phase_ratef(1810.0f);
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#endif
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bert_init(&bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
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bert_set_report(&bert, 10000, reporter, NULL);
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if ((line_model = one_way_line_model_init(line_model_no, (float) noise_level, channel_codec, 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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}
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rx = v27ter_rx_init(NULL, test_bps, v27terputbit, NULL);
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logging = v27ter_rx_get_logging_state(rx);
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span_log_set_level(logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
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span_log_set_tag(logging, "V.27ter-rx");
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v27ter_rx_set_modem_status_handler(rx, v27ter_rx_status, (void *) rx);
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v27ter_rx_set_qam_report_handler(rx, qam_report, (void *) rx);
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#if defined(ENABLE_GUI)
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if (use_gui)
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{
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qam_monitor = qam_monitor_init(2.0f, V27TER_CONSTELLATION_SCALING_FACTOR, NULL);
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if (!decode_test_file)
|
|
{
|
|
start_line_model_monitor(129);
|
|
line_model_monitor_line_model_update(line_model->near_filter, line_model->near_filter_len);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
memset(&latest_results, 0, sizeof(latest_results));
|
|
for (block_no = 0; ; block_no++)
|
|
{
|
|
if (decode_test_file)
|
|
{
|
|
samples = sf_readf_short(inhandle, amp, BLOCK_LEN);
|
|
#if defined(ENABLE_GUI)
|
|
if (use_gui)
|
|
qam_monitor_update_audio_level(qam_monitor, amp, samples);
|
|
#endif
|
|
if (samples == 0)
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
samples = v27ter_tx(tx, gen_amp, BLOCK_LEN);
|
|
#if defined(ENABLE_GUI)
|
|
if (use_gui)
|
|
qam_monitor_update_audio_level(qam_monitor, gen_amp, samples);
|
|
#endif
|
|
if (samples == 0)
|
|
{
|
|
printf("Restarting on zero output\n");
|
|
|
|
/* Push a little silence through, to ensure all the data bits get out of the buffers */
|
|
vec_zeroi16(amp, BLOCK_LEN);
|
|
v27ter_rx(rx, amp, BLOCK_LEN);
|
|
v27ter_rx(rx, amp, BLOCK_LEN);
|
|
v27ter_rx(rx, amp, BLOCK_LEN);
|
|
|
|
/* Note that we might get a few bad bits as the carrier shuts down. */
|
|
bert_result(&bert, &bert_results);
|
|
fprintf(stderr, "Final result %ddBm0/%ddBm0, %d bits, %d bad bits, %d resyncs\n", signal_level, noise_level, bert_results.total_bits, bert_results.bad_bits, bert_results.resyncs);
|
|
fprintf(stderr, "Last report %ddBm0/%ddBm0, %d bits, %d bad bits, %d resyncs\n", signal_level, noise_level, latest_results.total_bits, latest_results.bad_bits, latest_results.resyncs);
|
|
/* See if bit errors are appearing yet. Also check we are getting enough bits out of the receiver. The last regular report
|
|
should be error free, though the final report will generally contain bits errors as the carrier was dying. The total
|
|
number of bits out of the receiver should be at least the number we sent. Also, since BERT sync should have occurred
|
|
rapidly at the start of transmission, the last report should have occurred at not much less than the total number of
|
|
bits we sent. */
|
|
if (bert_results.total_bits < bits_per_test
|
|
||
|
|
latest_results.total_bits < bits_per_test - 100
|
|
||
|
|
latest_results.bad_bits != 0)
|
|
{
|
|
break;
|
|
}
|
|
memset(&latest_results, 0, sizeof(latest_results));
|
|
signal_level--;
|
|
v27ter_tx_restart(tx, test_bps, tep);
|
|
v27ter_tx_power(tx, signal_level);
|
|
v27ter_rx_restart(rx, test_bps, false);
|
|
bert_init(&bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
|
|
bert_set_report(&bert, 10000, reporter, NULL);
|
|
one_way_line_model_free(line_model);
|
|
if ((line_model = one_way_line_model_init(line_model_no, (float) noise_level, channel_codec, 0)) == NULL)
|
|
{
|
|
fprintf(stderr, " Failed to create line model\n");
|
|
exit(2);
|
|
}
|
|
}
|
|
|
|
if (log_audio)
|
|
{
|
|
outframes = sf_writef_short(outhandle, gen_amp, samples);
|
|
if (outframes != samples)
|
|
{
|
|
fprintf(stderr, " Error writing audio file\n");
|
|
exit(2);
|
|
}
|
|
}
|
|
one_way_line_model(line_model, amp, gen_amp, samples);
|
|
}
|
|
#if defined(ENABLE_GUI)
|
|
if (use_gui && !decode_test_file)
|
|
line_model_monitor_line_spectrum_update(amp, samples);
|
|
#endif
|
|
v27ter_rx(rx, amp, samples);
|
|
}
|
|
if (!decode_test_file)
|
|
{
|
|
bert_result(&bert, &bert_results);
|
|
fprintf(stderr, "At completion:\n");
|
|
fprintf(stderr, "Final result %ddBm0/%ddBm0, %d bits, %d bad bits, %d resyncs\n", signal_level, noise_level, bert_results.total_bits, bert_results.bad_bits, bert_results.resyncs);
|
|
fprintf(stderr, "Last report %ddBm0/%ddBm0, %d bits, %d bad bits, %d resyncs\n", signal_level, noise_level, latest_results.total_bits, latest_results.bad_bits, latest_results.resyncs);
|
|
one_way_line_model_free(line_model);
|
|
|
|
if (signal_level > -43)
|
|
{
|
|
printf("Tests failed.\n");
|
|
exit(2);
|
|
}
|
|
|
|
printf("Tests passed.\n");
|
|
}
|
|
v27ter_rx_free(rx);
|
|
if (tx)
|
|
v27ter_tx_free(tx);
|
|
bert_release(&bert);
|
|
#if defined(ENABLE_GUI)
|
|
if (use_gui)
|
|
qam_wait_to_end(qam_monitor);
|
|
#endif
|
|
if (decode_test_file)
|
|
{
|
|
if (sf_close_telephony(inhandle))
|
|
{
|
|
fprintf(stderr, " Cannot close audio file '%s'\n", decode_test_file);
|
|
exit(2);
|
|
}
|
|
}
|
|
if (log_audio)
|
|
{
|
|
if (sf_close_telephony(outhandle))
|
|
{
|
|
fprintf(stderr, " Cannot close audio file '%s'\n", OUT_FILE_NAME);
|
|
exit(2);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
/*- End of function --------------------------------------------------------*/
|
|
/*- End of file ------------------------------------------------------------*/
|