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freeswitch/libs/spandsp/src/fax_modems.c
Steve Underwood 7b9e4ff674 Various updates to spandsp tests 
spandsp logging now passes an opaque pointer to the logging routine, to
increase flexibility. Right now the pointer is set to NULL in all calls.
2012-03-28 23:36:30 +08:00

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/*
* SpanDSP - a series of DSP components for telephony
*
* fax_modems.c - the analogue modem set for fax processing
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2003, 2005, 2006, 2008 Steve Underwood
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1,
* as published by the Free Software Foundation.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*! \file */
#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif
#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#if defined(HAVE_TGMATH_H)
#include <tgmath.h>
#endif
#if defined(HAVE_MATH_H)
#include <math.h>
#endif
#include "floating_fudge.h"
#include <assert.h>
#include <fcntl.h>
#include <time.h>
#if defined(LOG_FAX_AUDIO)
#include <unistd.h>
#endif
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/bit_operations.h"
#include "spandsp/dc_restore.h"
#include "spandsp/queue.h"
#include "spandsp/power_meter.h"
#include "spandsp/complex.h"
#include "spandsp/tone_detect.h"
#include "spandsp/tone_generate.h"
#include "spandsp/async.h"
#include "spandsp/crc.h"
#include "spandsp/hdlc.h"
#include "spandsp/silence_gen.h"
#include "spandsp/fsk.h"
#include "spandsp/v29tx.h"
#include "spandsp/v29rx.h"
#include "spandsp/v27ter_tx.h"
#include "spandsp/v27ter_rx.h"
#include "spandsp/v17tx.h"
#include "spandsp/v17rx.h"
#include "spandsp/super_tone_rx.h"
#include "spandsp/modem_connect_tones.h"
#include "spandsp/fax_modems.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/silence_gen.h"
#include "spandsp/private/fsk.h"
#include "spandsp/private/v17tx.h"
#include "spandsp/private/v17rx.h"
#include "spandsp/private/v27ter_tx.h"
#include "spandsp/private/v27ter_rx.h"
#include "spandsp/private/v29tx.h"
#include "spandsp/private/v29rx.h"
#include "spandsp/private/modem_connect_tones.h"
#include "spandsp/private/hdlc.h"
#include "spandsp/private/fax_modems.h"
#define HDLC_FRAMING_OK_THRESHOLD 5
SPAN_DECLARE_NONSTD(int) fax_modems_v17_v21_rx(void *user_data, const int16_t amp[], int len)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
v17_rx(&s->fast_modems.v17_rx, amp, len);
fsk_rx(&s->v21_rx, amp, len);
if (s->rx_frame_received)
{
/* We have received something, and the fast modem has not trained. We must
be receiving valid V.21 */
span_log(&s->logging, SPAN_LOG_FLOW, "Switching from V.17 + V.21 to V.21 (%.2fdBm0)\n", fsk_rx_signal_power(&s->v21_rx));
s->rx_handler = (span_rx_handler_t *) &fsk_rx;
s->rx_fillin_handler = (span_rx_fillin_handler_t *) &fsk_rx_fillin;
s->rx_user_data = &s->v21_rx;
}
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE_NONSTD(int) fax_modems_v17_v21_rx_fillin(void *user_data, int len)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
v17_rx_fillin(&s->fast_modems.v17_rx, len);
fsk_rx_fillin(&s->v21_rx, len);
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE_NONSTD(int) fax_modems_v27ter_v21_rx(void *user_data, const int16_t amp[], int len)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
v27ter_rx(&s->fast_modems.v27ter_rx, amp, len);
fsk_rx(&s->v21_rx, amp, len);
if (s->rx_frame_received)
{
/* We have received something, and the fast modem has not trained. We must
be receiving valid V.21 */
span_log(&s->logging, SPAN_LOG_FLOW, "Switching from V.27ter + V.21 to V.21 (%.2fdBm0)\n", fsk_rx_signal_power(&s->v21_rx));
s->rx_handler = (span_rx_handler_t *) &fsk_rx;
s->rx_fillin_handler = (span_rx_fillin_handler_t *) &fsk_rx_fillin;
s->rx_user_data = &s->v21_rx;
}
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE_NONSTD(int) fax_modems_v27ter_v21_rx_fillin(void *user_data, int len)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
v27ter_rx_fillin(&s->fast_modems.v27ter_rx, len);
fsk_rx_fillin(&s->v21_rx, len);
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE_NONSTD(int) fax_modems_v29_v21_rx(void *user_data, const int16_t amp[], int len)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
v29_rx(&s->fast_modems.v29_rx, amp, len);
fsk_rx(&s->v21_rx, amp, len);
if (s->rx_frame_received)
{
/* We have received something, and the fast modem has not trained. We must
be receiving valid V.21 */
span_log(&s->logging, SPAN_LOG_FLOW, "Switching from V.29 + V.21 to V.21 (%.2fdBm0)\n", fsk_rx_signal_power(&s->v21_rx));
s->rx_handler = (span_rx_handler_t *) &fsk_rx;
s->rx_fillin_handler = (span_rx_fillin_handler_t *) &fsk_rx_fillin;
s->rx_user_data = &s->v21_rx;
}
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE_NONSTD(int) fax_modems_v29_v21_rx_fillin(void *user_data, int len)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
v29_rx_fillin(&s->fast_modems.v29_rx, len);
fsk_rx_fillin(&s->v21_rx, len);
return 0;
}
/*- End of function --------------------------------------------------------*/
static void v21_rx_status_handler(void *user_data, int status)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
}
/*- End of function --------------------------------------------------------*/
static void v17_rx_status_handler(void *user_data, int status)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
switch (status)
{
case SIG_STATUS_TRAINING_SUCCEEDED:
span_log(&s->logging, SPAN_LOG_FLOW, "Switching to V.17 (%.2fdBm0)\n", v17_rx_signal_power(&s->fast_modems.v17_rx));
s->rx_handler = (span_rx_handler_t *) &v17_rx;
s->rx_fillin_handler = (span_rx_fillin_handler_t *) &v17_rx_fillin;
s->rx_user_data = &s->fast_modems.v17_rx;
break;
}
}
/*- End of function --------------------------------------------------------*/
static void v27ter_rx_status_handler(void *user_data, int status)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
switch (status)
{
case SIG_STATUS_TRAINING_SUCCEEDED:
span_log(&s->logging, SPAN_LOG_FLOW, "Switching to V.27ter (%.2fdBm0)\n", v27ter_rx_signal_power(&s->fast_modems.v27ter_rx));
s->rx_handler = (span_rx_handler_t *) &v27ter_rx;
s->rx_fillin_handler = (span_rx_fillin_handler_t *) &v27ter_rx_fillin;
s->rx_user_data = &s->fast_modems.v27ter_rx;
break;
}
}
/*- End of function --------------------------------------------------------*/
static void v29_rx_status_handler(void *user_data, int status)
{
fax_modems_state_t *s;
s = (fax_modems_state_t *) user_data;
switch (status)
{
case SIG_STATUS_TRAINING_SUCCEEDED:
span_log(&s->logging, SPAN_LOG_FLOW, "Switching to V.29 (%.2fdBm0)\n", v29_rx_signal_power(&s->fast_modems.v29_rx));
s->rx_handler = (span_rx_handler_t *) &v29_rx;
s->rx_fillin_handler = (span_rx_fillin_handler_t *) &v29_rx_fillin;
s->rx_user_data = &s->fast_modems.v29_rx;
break;
}
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) fax_modems_start_rx_modem(fax_modems_state_t *s, int which)
{
switch (which)
{
case FAX_MODEM_V17_RX:
v17_rx_set_modem_status_handler(&s->fast_modems.v17_rx, v17_rx_status_handler, s);
break;
case FAX_MODEM_V27TER_RX:
v27ter_rx_set_modem_status_handler(&s->fast_modems.v27ter_rx, v27ter_rx_status_handler, s);
break;
case FAX_MODEM_V29_RX:
v29_rx_set_modem_status_handler(&s->fast_modems.v29_rx, v29_rx_status_handler, s);
break;
}
fsk_rx_set_modem_status_handler(&s->v21_rx, v21_rx_status_handler, s);
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) fax_modems_set_tep_mode(fax_modems_state_t *s, int use_tep)
{
s->use_tep = use_tep;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(logging_state_t *) fax_modems_get_logging_state(fax_modems_state_t *s)
{
return &s->logging;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) fax_modems_restart(fax_modems_state_t *s)
{
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(fax_modems_state_t *) fax_modems_init(fax_modems_state_t *s,
int use_tep,
hdlc_frame_handler_t hdlc_accept,
hdlc_underflow_handler_t hdlc_tx_underflow,
put_bit_func_t non_ecm_put_bit,
get_bit_func_t non_ecm_get_bit,
tone_report_func_t tone_callback,
void *user_data)
{
if (s == NULL)
{
if ((s = (fax_modems_state_t *) malloc(sizeof(*s))) == NULL)
return NULL;
}
memset(s, 0, sizeof(*s));
s->use_tep = use_tep;
hdlc_rx_init(&s->hdlc_rx, FALSE, FALSE, HDLC_FRAMING_OK_THRESHOLD, hdlc_accept, user_data);
hdlc_tx_init(&s->hdlc_tx, FALSE, 2, FALSE, hdlc_tx_underflow, user_data);
fsk_rx_init(&s->v21_rx, &preset_fsk_specs[FSK_V21CH2], FSK_FRAME_MODE_SYNC, (put_bit_func_t) hdlc_rx_put_bit, &s->hdlc_rx);
fsk_rx_signal_cutoff(&s->v21_rx, -39.09f);
fsk_tx_init(&s->v21_tx, &preset_fsk_specs[FSK_V21CH2], (get_bit_func_t) hdlc_tx_get_bit, &s->hdlc_tx);
v17_rx_init(&s->fast_modems.v17_rx, 14400, non_ecm_put_bit, user_data);
v17_tx_init(&s->fast_modems.v17_tx, 14400, s->use_tep, non_ecm_get_bit, user_data);
v29_rx_init(&s->fast_modems.v29_rx, 9600, non_ecm_put_bit, user_data);
v29_rx_signal_cutoff(&s->fast_modems.v29_rx, -45.5f);
v29_tx_init(&s->fast_modems.v29_tx, 9600, s->use_tep, non_ecm_get_bit, user_data);
v27ter_rx_init(&s->fast_modems.v27ter_rx, 4800, non_ecm_put_bit, user_data);
v27ter_tx_init(&s->fast_modems.v27ter_tx, 4800, s->use_tep, non_ecm_get_bit, user_data);
silence_gen_init(&s->silence_gen, 0);
modem_connect_tones_tx_init(&s->connect_tx, MODEM_CONNECT_TONES_FAX_CNG);
if (tone_callback)
{
modem_connect_tones_rx_init(&s->connect_rx,
MODEM_CONNECT_TONES_FAX_CNG,
tone_callback,
user_data);
}
dc_restore_init(&s->dc_restore);
s->rx_signal_present = FALSE;
s->rx_handler = (span_rx_handler_t *) &span_dummy_rx;
s->rx_fillin_handler = (span_rx_fillin_handler_t *) &span_dummy_rx;
s->rx_user_data = NULL;
s->tx_handler = (span_tx_handler_t *) &silence_gen;
s->tx_user_data = &s->silence_gen;
return s;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) fax_modems_release(fax_modems_state_t *s)
{
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) fax_modems_free(fax_modems_state_t *s)
{
if (s)
free(s);
return 0;
}
/*- End of function --------------------------------------------------------*/
/*- End of file ------------------------------------------------------------*/
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