Add support for faxes based on spandsp port.

3 files changed, 682 insertions, 8 deletions

diff --git a/net/asterisk10/files/patch-apps::Makefile b/net/asterisk10/files/patch-apps::Makefile
index 00b77dfe2434..44f8495864c4 100644
--- a/net/asterisk10/files/patch-apps::Makefile
+++ b/net/asterisk10/files/patch-apps::Makefile
@@ -1,9 +1,6 @@
-
-$FreeBSD$
-
---- apps/Makefile.orig	Sat Sep 25 00:32:56 2004
-+++ apps/Makefile	Sun Oct 10 16:20:06 2004
-@@ -40,7 +40,7 @@
+--- apps/Makefile.orig	Wed Jun 22 14:40:11 2005
++++ apps/Makefile	Wed Jun 22 14:43:45 2005
+@@ -40,9 +40,13 @@
  #APPS+=app_rpt.so
  
  APPS+=$(shell if [ -f /usr/include/linux/zaptel.h ]; then echo "app_zapras.so app_meetme.so app_flash.so app_zapbarge.so app_zapscan.so" ; fi)
@@ -11,8 +8,14 @@ $FreeBSD$
 +APPS+=$(shell if [ -f $(LOCALBASE)/include/zaptel.h ]; then echo "app_zapras.so app_meetme.so app_flash.so app_zapbarge.so app_zapscan.so" ; fi)
  APPS+=$(shell if [ -f /usr/include/osp/osp.h ]; then echo "app_osplookup.so" ; fi)
  
++ifdef WITH_FAX
++APPS+=$(shell if [ -f $(LOCALBASE)/include/spandsp.h ]; then echo "app_rxfax.so app_txfax.so" ; fi)
++endif
++
  CFLAGS+=-fPIC
-@@ -65,12 +65,12 @@
+ 
+ ifeq ($(USE_POSTGRES_VM_INTERFACE),1)
+@@ -65,12 +69,12 @@
  	$(CC) $(SOLINK) -o $@ $< -ltonezone
  
  install: all
@@ -27,9 +30,18 @@ $FreeBSD$
  else
  ifeq ($(USE_POSTGRES_VM_INTERFACE),1)
  	$(CC) $(SOLINK) -o $@ $(MLFLAGS) $< -lpq
-@@ -80,16 +80,16 @@
+@@ -79,17 +83,25 @@
+ endif
  endif
  
++ifdef WITH_FAX
++app_rxfax.so : app_rxfax.o
++	$(CC) $(SOLINK) -o $@ $< -L$(LOCALBASE)/lib -lspandsp -ltiff
++
++app_txfax.so : app_txfax.o
++	$(CC) $(SOLINK) -o $@ $< -L$(LOCALBASE)/lib -lspandsp -ltiff
++endif
++
  app_sql_postgres.o: app_sql_postgres.c
 -	$(CC) -pipe -I/usr/local/pgsql/include $(CFLAGS) -c -o app_sql_postgres.o app_sql_postgres.c
 +	$(CC) -I$(LOCALBASE)/include/pgsql $(CFLAGS) -c -o app_sql_postgres.o app_sql_postgres.c
diff --git a/net/asterisk10/files/patch-apps::app_rxfax.c b/net/asterisk10/files/patch-apps::app_rxfax.c
new file mode 100644
index 000000000000..c8f4e3e296dc
--- /dev/null
+++ b/net/asterisk10/files/patch-apps::app_rxfax.c
@@ -0,0 +1,370 @@
+--- apps/app_rxfax.c.orig	Fri Jun 17 21:13:01 2005
++++ apps/app_rxfax.c	Fri Jun 17 21:04:12 2005
+@@ -0,0 +1,367 @@
++/*
++ * Asterisk -- A telephony toolkit for Linux.
++ *
++ * Trivial application to receive a TIFF FAX file
++ * 
++ * Copyright (C) 2003, Steve Underwood
++ *
++ * Steve Underwood <steveu@coppice.org>
++ *
++ * This program is free software, distributed under the terms of
++ * the GNU General Public License
++ */
++ 
++#include <asterisk/lock.h>
++#include <asterisk/file.h>
++#include <asterisk/logger.h>
++#include <asterisk/channel.h>
++#include <asterisk/pbx.h>
++#include <asterisk/module.h>
++#include <asterisk/translate.h>
++#include <asterisk/dsp.h>
++#include <asterisk/manager.h>
++#include <string.h>
++#include <stdlib.h>
++#include <stdint.h>
++#include <pthread.h>
++#include <errno.h>
++#include <math.h>
++#include <tiffio.h>
++
++#include <spandsp.h>
++
++static char *tdesc = "Trivial FAX Receive Application";
++
++static char *app = "RxFAX";
++
++static char *synopsis = "Receive a FAX to a file";
++
++static char *descrip = 
++"  RxFAX(filename[|caller][|debug]): Receives a FAX from the channel into the\n"
++"given filename. If the file exists it will be overwritten. The file\n"
++"should be in TIFF/F format.\n"
++"The \"caller\" option makes the application behave as a calling machine,\n"
++"rather than the answering machine. The default behaviour is to behave as\n"
++"an answering machine.\n"
++"Uses LOCALSTATIONID to identify itself to the remote end.\n"
++"     LOCALHEADERINFO to generate a header line on each page.\n"
++"Sets REMOTESTATIONID to the sender CSID.\n"
++"     FAXPAGES to the number of pages received.\n"
++"     FAXBITRATE to the transmition rate.\n"
++"     FAXRESOLUTION to the resolution.\n"
++"Returns -1 when the user hangs up.\n"
++"Returns 0 otherwise.\n";
++
++STANDARD_LOCAL_USER;
++
++LOCAL_USER_DECL;
++
++#define MAX_BLOCK_SIZE 240
++
++static void t30_flush(t30_state_t *s, int which)
++{
++    //TODO:
++}
++/*- End of function --------------------------------------------------------*/
++
++static void phase_e_handler(t30_state_t *s, void *user_data, int result)
++{
++    struct ast_channel *chan;
++    t30_stats_t t;
++    char local_ident[21];
++    char far_ident[21];
++    char buf[11];
++    
++    chan = (struct ast_channel *) user_data;
++    if (result)
++    {
++        fax_get_transfer_statistics(s, &t);
++        fax_get_far_ident(s, far_ident);
++        fax_get_local_ident(s, local_ident);
++        ast_log(LOG_DEBUG, "==============================================================================\n");
++        ast_log(LOG_DEBUG, "Fax successfully received.\n");
++        ast_log(LOG_DEBUG, "Remote station id: %s\n", far_ident);
++        ast_log(LOG_DEBUG, "Local station id:  %s\n", local_ident);
++        ast_log(LOG_DEBUG, "Pages transferred: %i\n", t.pages_transferred);
++        ast_log(LOG_DEBUG, "Image resolution:  %i x %i\n", t.column_resolution, t.row_resolution);
++        ast_log(LOG_DEBUG, "Transfer Rate:     %i\n", t.bit_rate);
++        ast_log(LOG_DEBUG, "==============================================================================\n");
++        manager_event(EVENT_FLAG_CALL,
++                      "FaxReceived", "Channel: %s\nExten: %s\nCallerID: %s\nRemoteStationID: %s\nLocalStationID: %s\nPagesTransferred: %i\nResolution: %i\nTransferRate: %i\nFileName: %s\n",
++                      chan->name,
++                      chan->exten,
++#if (ASTERISK_VERSION_NUM <= 011000)
++                      chan->callerid,
++#else
++                      (chan->cid.cid_num)  ?  chan->cid.cid_num  :  "",
++#endif
++                      far_ident,
++                      local_ident,
++                      t.pages_transferred,
++                      t.row_resolution,
++                      t.bit_rate,
++                      s->rx_file);
++        pbx_builtin_setvar_helper(chan, "REMOTESTATIONID", far_ident);
++        snprintf(buf, sizeof(buf), "%i", t.pages_transferred);
++        pbx_builtin_setvar_helper(chan, "FAXPAGES", buf);
++        snprintf(buf, sizeof(buf), "%i", t.row_resolution);
++        pbx_builtin_setvar_helper(chan, "FAXRESOLUTION", buf);
++        snprintf(buf, sizeof(buf), "%i", t.bit_rate);
++        pbx_builtin_setvar_helper(chan, "FAXBITRATE", buf);
++    }
++    else
++    {
++        ast_log(LOG_DEBUG, "==============================================================================\n");
++        ast_log(LOG_DEBUG, "Fax receive not successful.\n");
++        ast_log(LOG_DEBUG, "==============================================================================\n");
++    }
++}
++/*- End of function --------------------------------------------------------*/
++
++static void phase_d_handler(t30_state_t *s, void *user_data, int result)
++{
++    struct ast_channel *chan;
++    t30_stats_t t;
++    
++    chan = (struct ast_channel *) user_data;
++    if (result)
++    {
++        fax_get_transfer_statistics(s, &t);
++        ast_log(LOG_DEBUG, "==============================================================================\n");
++        ast_log(LOG_DEBUG, "Pages transferred:  %i\n", t.pages_transferred);
++        ast_log(LOG_DEBUG, "Image size:         %i x %i\n", t.columns, t.rows);
++        ast_log(LOG_DEBUG, "Image resolution    %i x %i\n", t.column_resolution, t.row_resolution);
++        ast_log(LOG_DEBUG, "Transfer Rate:      %i\n", t.bit_rate);
++        ast_log(LOG_DEBUG, "Bad rows            %i\n", t.bad_rows);
++        ast_log(LOG_DEBUG, "Longest bad row run %i\n", t.longest_bad_row_run);
++        ast_log(LOG_DEBUG, "Compression type    %i\n", t.encoding);
++        ast_log(LOG_DEBUG, "Image size (bytes)  %i\n", t.image_size);
++        ast_log(LOG_DEBUG, "==============================================================================\n");
++    }
++}
++/*- End of function --------------------------------------------------------*/
++
++static int rxfax_exec(struct ast_channel *chan, void *data)
++{
++    int res = 0;
++    char template_file[256];
++    char target_file[256];
++    char *s;
++    char *t;
++    char *v;
++    char *x;
++    int option;
++    int len;
++    int i;
++    t30_state_t fax;
++    int calling_party;
++    int verbose;
++    int samples;
++
++    struct localuser *u;
++    struct ast_frame *inf = NULL;
++    struct ast_frame outf;
++
++    int original_read_fmt;
++    int original_write_fmt;
++    
++    uint8_t __buf[sizeof(uint16_t)*MAX_BLOCK_SIZE + 2*AST_FRIENDLY_OFFSET];
++    uint8_t *buf = __buf + AST_FRIENDLY_OFFSET;
++
++    if (chan == NULL)
++    {
++        ast_log(LOG_WARNING, "Fax receive channel is NULL. Giving up.\n");
++        return -1;
++    }
++
++    /* The next few lines of code parse out the filename and header from the input string */
++    if (data == NULL)
++    {
++        /* No data implies no filename or anything is present */
++        ast_log(LOG_WARNING, "Rxfax requires an argument (filename)\n");
++        return -1;
++    }
++    
++    calling_party = FALSE;
++    verbose = FALSE;
++    target_file[0] = '\0';
++
++    for (option = 0, v = s = data;  v;  option++, s++)
++    {
++        t = s;
++        v = strchr(s, '|');
++        s = (v)  ?  v  :  s + strlen(s);
++        strncpy(buf, t, s - t);
++        buf[s - t] = '\0';
++        if (option == 0)
++        {
++            /* The first option is always the file name */
++            len = s - t;
++            if (len > 255)
++                len = 255;
++            strncpy(target_file, t, len);
++            target_file[len] = '\0';
++            /* Allow the use of %d in the file name for a wild card of sorts, to
++               create a new file with the specified name scheme */
++            if ((x = strchr(target_file, '%'))  &&  x[1] == 'd')
++            {
++                strcpy(template_file, target_file);
++                i = 0;
++                do
++                {
++                    snprintf(target_file, 256, template_file, 1);
++                    i++;
++                }
++                while (ast_fileexists(target_file, "", chan->language) != -1);
++            }
++        }
++        else if (strncmp("caller", t, s - t) == 0)
++        {
++            calling_party = TRUE;
++        }
++        else if (strncmp("debug", t, s - t) == 0)
++        {
++            verbose = TRUE;
++        }
++    }
++
++    /* Done parsing */
++
++    LOCAL_USER_ADD(u);
++
++    if (chan->_state != AST_STATE_UP)
++    {
++        /* Shouldn't need this, but checking to see if channel is already answered
++         * Theoretically asterisk should already have answered before running the app */
++        res = ast_answer(chan);
++    }
++    
++    if (!res)
++    {
++        original_read_fmt = chan->readformat;
++        if (original_read_fmt != AST_FORMAT_SLINEAR)
++        {
++            res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
++            if (res < 0)
++            {
++                ast_log(LOG_WARNING, "Unable to set to linear read mode, giving up\n");
++                return -1;
++            }
++        }
++        original_write_fmt = chan->writeformat;
++        if (original_write_fmt != AST_FORMAT_SLINEAR)
++        {
++            res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
++            if (res < 0)
++            {
++                ast_log(LOG_WARNING, "Unable to set to linear write mode, giving up\n");
++                res = ast_set_read_format(chan, original_read_fmt);
++                if (res)
++                    ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", chan->name);
++                return -1;
++            }
++        }
++        fax_init(&fax, calling_party, NULL);
++        fax.verbose = verbose;
++        x = pbx_builtin_getvar_helper(chan, "LOCALSTATIONID");
++        if (x  &&  x[0])
++            fax_set_local_ident(&fax, x);
++        x = pbx_builtin_getvar_helper(chan, "LOCALHEADERINFO");
++        if (x  &&  x[0])
++            fax_set_header_info(&fax, x);
++        fax_set_rx_file(&fax, target_file);
++        //fax_set_phase_b_handler(&fax, phase_b_handler, chan);
++        fax_set_phase_d_handler(&fax, phase_d_handler, chan);
++        fax_set_phase_e_handler(&fax, phase_e_handler, chan);
++        while (ast_waitfor(chan, -1) > -1)
++        {
++            inf = ast_read(chan);
++            if (inf == NULL)
++            {
++                res = -1;
++                break;
++            }
++            if (inf->frametype == AST_FRAME_VOICE)
++            {
++                if (fax_rx_process(&fax, inf->data, inf->samples))
++                    break;
++                samples = (inf->samples <= MAX_BLOCK_SIZE)  ?  inf->samples  :  MAX_BLOCK_SIZE;
++                len = fax_tx_process(&fax, (int16_t *) &buf[AST_FRIENDLY_OFFSET], samples);
++                if (len)
++                {
++                    memset(&outf, 0, sizeof(outf));
++                    outf.frametype = AST_FRAME_VOICE;
++                    outf.subclass = AST_FORMAT_SLINEAR;
++                    outf.datalen = len*sizeof(int16_t);
++                    outf.samples = len;
++                    outf.data = &buf[AST_FRIENDLY_OFFSET];
++                    outf.offset = AST_FRIENDLY_OFFSET;
++                    outf.src = "RxFAX";
++                    if (ast_write(chan, &outf) < 0)
++                    {
++                        ast_log(LOG_WARNING, "Unable to write frame to channel; %s\n", strerror(errno));
++                        break;
++                    }
++                }
++            }
++            ast_frfree(inf);
++        }
++        if (inf == NULL)
++        {
++            ast_log(LOG_DEBUG, "Got hangup\n");
++            res = -1;
++        }
++        if (original_read_fmt != AST_FORMAT_SLINEAR)
++        {
++            res = ast_set_read_format(chan, original_read_fmt);
++            if (res)
++                ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", chan->name);
++        }
++        if (original_write_fmt != AST_FORMAT_SLINEAR)
++        {
++            res = ast_set_write_format(chan, original_write_fmt);
++            if (res)
++                ast_log(LOG_WARNING, "Unable to restore write format on '%s'\n", chan->name);
++        }
++    }
++    else
++    {
++        ast_log(LOG_WARNING, "Could not answer channel '%s'\n", chan->name);
++    }
++    LOCAL_USER_REMOVE(u);
++    return res;
++}
++/*- End of function --------------------------------------------------------*/
++
++int unload_module(void)
++{
++    STANDARD_HANGUP_LOCALUSERS;
++    return ast_unregister_application(app);
++}
++/*- End of function --------------------------------------------------------*/
++
++int load_module(void)
++{
++    return ast_register_application(app, rxfax_exec, synopsis, descrip);
++}
++
++char *description(void)
++{
++    return tdesc;
++}
++/*- End of function --------------------------------------------------------*/
++
++int usecount(void)
++{
++    int res;
++    STANDARD_USECOUNT(res);
++    return res;
++}
++/*- End of function --------------------------------------------------------*/
++
++char *key(void)
++{
++    return ASTERISK_GPL_KEY;
++}
++/*- End of function --------------------------------------------------------*/
++/*- End of file ------------------------------------------------------------*/
diff --git a/net/asterisk10/files/patch-apps::app_txfax.c b/net/asterisk10/files/patch-apps::app_txfax.c
new file mode 100644
index 000000000000..52bcc3fdde23
--- /dev/null
+++ b/net/asterisk10/files/patch-apps::app_txfax.c
@@ -0,0 +1,292 @@
+--- apps/app_txfax.c.orig	Fri Jun 17 21:13:05 2005
++++ apps/app_txfax.c	Fri Jun 17 21:00:43 2005
+@@ -0,0 +1,289 @@
++/*
++ * Asterisk -- A telephony toolkit for Linux.
++ *
++ * Trivial application to send a TIFF file as a FAX
++ * 
++ * Copyright (C) 2003, Steve Underwood
++ *
++ * Steve Underwood <steveu@coppice.org>
++ *
++ * This program is free software, distributed under the terms of
++ * the GNU General Public License
++ */
++ 
++#include <asterisk/lock.h>
++#include <asterisk/file.h>
++#include <asterisk/logger.h>
++#include <asterisk/channel.h>
++#include <asterisk/pbx.h>
++#include <asterisk/module.h>
++#include <asterisk/translate.h>
++#include <string.h>
++#include <stdlib.h>
++#include <stdint.h>
++#include <pthread.h>
++#include <errno.h>
++#include <tiffio.h>
++
++#include <spandsp.h>
++
++static char *tdesc = "Trivial FAX Transmit Application";
++
++static char *app = "TxFAX";
++
++static char *synopsis = "Send a FAX file";
++
++static char *descrip = 
++"  TxFAX(filename[|caller][|debug]):  Send a given TIFF file to the channel as a FAX.\n"
++"The \"caller\" option makes the application behave as a calling machine,\n"
++"rather than the answering machine. The default behaviour is to behave as\n"
++"an answering machine.\n"
++"Uses LOCALSTATIONID to identify itself to the remote end.\n"
++"     LOCALHEADERINFO to generate a header line on each page.\n"
++"Sets REMOTESTATIONID to the receiver CSID.\n"
++"Returns -1 when the user hangs up, or if the file does not exist.\n"
++"Returns 0 otherwise.\n";
++
++STANDARD_LOCAL_USER;
++
++LOCAL_USER_DECL;
++
++#define MAX_BLOCK_SIZE 240
++
++static void t30_flush(t30_state_t *s, int which)
++{
++    //TODO:
++}
++/*- End of function --------------------------------------------------------*/
++
++static void phase_e_handler(t30_state_t *s, void *user_data, int result)
++{
++    struct ast_channel *chan;
++    char far_ident[21];
++    
++    chan = (struct ast_channel *) user_data;
++    if (result)
++    {
++        fax_get_far_ident(s, far_ident);
++        pbx_builtin_setvar_helper(chan, "REMOTESTATIONID", far_ident);
++    }
++    else
++    {
++        ast_log(LOG_DEBUG, "==============================================================================\n");
++        ast_log(LOG_DEBUG, "Fax send not successful.\n");
++        ast_log(LOG_DEBUG, "==============================================================================\n");
++    }
++}
++/*- End of function --------------------------------------------------------*/
++
++static int txfax_exec(struct ast_channel *chan, void *data)
++{
++    int res = 0;
++    char source_file[256];
++    char *x;
++    char *s;
++    char *t;
++    char *v;
++    int option;
++    int len;
++    t30_state_t fax;
++    int calling_party;
++    int verbose;
++    int samples;
++    
++    struct localuser *u;
++    struct ast_frame *inf = NULL;
++    struct ast_frame outf;
++
++    int original_read_fmt;
++    int original_write_fmt;
++    
++    uint8_t __buf[sizeof(uint16_t)*MAX_BLOCK_SIZE + 2*AST_FRIENDLY_OFFSET];
++    uint8_t *buf = __buf + AST_FRIENDLY_OFFSET;
++
++    if (chan == NULL)
++    {
++        ast_log(LOG_WARNING, "Fax transmit channel is NULL. Giving up.\n");
++        return -1;
++    }
++
++    /* The next few lines of code parse out the filename and header from the input string */
++    if (data == NULL)
++    {
++        /* No data implies no filename or anything is present */
++        ast_log(LOG_WARNING, "Txfax requires an argument (filename)\n");
++        return -1;
++    }
++    
++    calling_party = FALSE;
++    verbose = FALSE;
++    source_file[0] = '\0'; 
++
++    for (option = 0, v = s = data;  v;  option++, s++)
++    {
++        t = s;
++        v = strchr(s, '|');
++        s = (v)  ?  v  :  s + strlen(s);
++        strncpy(buf, t, s - t);
++        buf[s - t] = '\0';
++        if (option == 0)
++        {
++            /* The first option is always the file name */
++            len = s - t;
++            if (len > 255)
++                len = 255;
++            strncpy(source_file, t, len);
++            source_file[len] = '\0';
++        }
++        else if (strncmp("caller", t, s - t) == 0)
++        {
++            calling_party = TRUE;
++        }
++        else if (strncmp("debug", t, s - t) == 0)
++        {
++            verbose = TRUE;
++        }
++    }
++
++    /* Done parsing */
++
++    LOCAL_USER_ADD(u);
++
++    if (chan->_state != AST_STATE_UP)
++    {
++        /* Shouldn't need this, but checking to see if channel is already answered
++         * Theoretically asterisk should already have answered before running the app */
++        res = ast_answer(chan);
++    }
++    
++    if (!res)
++    {
++        original_read_fmt = chan->readformat;
++        if (original_read_fmt != AST_FORMAT_SLINEAR)
++        {
++            res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
++            if (res < 0)
++            {
++                ast_log(LOG_WARNING, "Unable to set to linear read mode, giving up\n");
++                return -1;
++            }
++        }
++        original_write_fmt = chan->writeformat;
++        if (original_write_fmt != AST_FORMAT_SLINEAR)
++        {
++            res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
++            if (res < 0)
++            {
++                ast_log(LOG_WARNING, "Unable to set to linear write mode, giving up\n");
++                res = ast_set_read_format(chan, original_read_fmt);
++                if (res)
++                    ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", chan->name);
++                return -1;
++            }
++        }
++        fax_init(&fax, calling_party, NULL);
++        fax.verbose = verbose;
++
++        x = pbx_builtin_getvar_helper(chan, "LOCALSTATIONID");
++        if (x  &&  x[0])
++            fax_set_local_ident(&fax, x);
++        x = pbx_builtin_getvar_helper(chan, "LOCALHEADERINFO");
++        if (x  &&  x[0])
++            fax_set_header_info(&fax, x);
++        fax_set_tx_file(&fax, source_file);
++        //fax_set_phase_b_handler(&fax, phase_b_handler, chan);
++        //fax_set_phase_d_handler(&fax, phase_d_handler, chan);
++        fax_set_phase_e_handler(&fax, phase_e_handler, chan);
++        while (ast_waitfor(chan, -1) > -1)
++        {
++            inf = ast_read(chan);
++            if (inf == NULL)
++            {
++                res = -1;
++                break;
++            }
++            if (inf->frametype == AST_FRAME_VOICE)
++            {
++                if (fax_rx_process(&fax, inf->data, inf->samples))
++                    break;
++                samples = (inf->samples <= MAX_BLOCK_SIZE)  ?  inf->samples  :  MAX_BLOCK_SIZE;
++                len = fax_tx_process(&fax, (int16_t *) &buf[AST_FRIENDLY_OFFSET], samples);
++                if (len)
++                {
++                    memset(&outf, 0, sizeof(outf));
++                    outf.frametype = AST_FRAME_VOICE;
++                    outf.subclass = AST_FORMAT_SLINEAR;
++                    outf.datalen = len*sizeof(int16_t);
++                    outf.samples = len;
++                    outf.data = &buf[AST_FRIENDLY_OFFSET];
++                    outf.offset = AST_FRIENDLY_OFFSET;
++                    if (ast_write(chan, &outf) < 0)
++                    {
++                        ast_log(LOG_WARNING, "Unable to write frame to channel; %s\n", strerror(errno));
++                        break;
++                    }
++                }
++            }
++            ast_frfree(inf);
++        }
++        if (inf == NULL)
++        {
++            ast_log(LOG_DEBUG, "Got hangup\n");
++            res = -1;
++        }
++        if (original_read_fmt != AST_FORMAT_SLINEAR)
++        {
++            res = ast_set_read_format(chan, original_read_fmt);
++            if (res)
++                ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", chan->name);
++        }
++        if (original_write_fmt != AST_FORMAT_SLINEAR)
++        {
++            res = ast_set_write_format(chan, original_write_fmt);
++            if (res)
++                ast_log(LOG_WARNING, "Unable to restore write format on '%s'\n", chan->name);
++        }
++    }
++    else
++    {
++        ast_log(LOG_WARNING, "Could not answer channel '%s'\n", chan->name);
++    }
++    LOCAL_USER_REMOVE(u);
++    return res;
++}
++/*- End of function --------------------------------------------------------*/
++
++int unload_module(void)
++{
++    STANDARD_HANGUP_LOCALUSERS;
++    return ast_unregister_application(app);
++}
++/*- End of function --------------------------------------------------------*/
++
++int load_module(void)
++{
++    return ast_register_application(app, txfax_exec, synopsis, descrip);
++}
++/*- End of function --------------------------------------------------------*/
++
++char *description(void)
++{
++    return tdesc;
++}
++/*- End of function --------------------------------------------------------*/
++
++int usecount(void)
++{
++    int res;
++
++    STANDARD_USECOUNT(res);
++    return res;
++}
++/*- End of function --------------------------------------------------------*/
++
++char *key(void)
++{
++    return ASTERISK_GPL_KEY;
++}
++/*- End of function --------------------------------------------------------*/
++/*- End of file ------------------------------------------------------------*/