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/*
ACfax - Fax reception with X11-interface for amateur radio
Copyright (C) 1995-1998 Andreas Czechanowski, DL4SDC
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
andreas.czechanowski@ins.uni-stuttgart.de
*/
/* fax_funcs.c - all fax-specific functions should be placed here.
* This file depends on neary everything; It calls the hardware-
* specific setup, the filter setup, and needs some X11-
* variables for writing into the canvas.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include "x_image.h"
#include <X11/Intrinsic.h>
#include "sblaster.h"
#include "mod_demod.h"
#include "widgets.h"
#include "fax_funcs.h"
/* some variables that are allowed to be global */
int lpm; /* lines per minute */
int ixoc; /* number of pixels of one scan-line / PI */
int devi; /* deviation in Hz (+/- of middle) */
int mod_mode; /* can be MOD_FM or MOD_AM */
int aptstart; /* possible APT start values */
int aptstop; /* possible APT stop values */
int aptdur; /* apt duration in millisecs (for transmitting) */
int vertical; /* vertical or horizontal line direction */
int right2left; /* boolean indicating reverse line writing direction */
int bot2top; /* boolean indicating reverse line stacking direction */
int invphase; /* polarity of phase-in-signal to use */
int invimage; /* inverse colormap usage */
/* and the private variables */
int fax_inited = 0; /* if fax_init was called */
unsigned canwid; /* width of the Pixmap to draw in */
unsigned canhei; /* height of the Pixmap */
int sxpos, sypos; /* current coordinates of received/xmitted data */
int pixpos, linepos; /* current coordinates of received/xmitted data */
int imline; /* currently processed line of XImage */
void (*update_area)(XImage *, int, int, int, int, unsigned, unsigned);
/* called to copy XImage to Pixmap and update the window-area required */
void (*mode_notify)(int); /* notifies main program of changes of fax_state */
int mcolor; /* color-mode selected */
int dmaxval; /* number of usable grayscale-values - 1 */
int compval; /* comparator value for APT-counter */
int flip; /* flipping of green and blue parts of the colormap */
int rotate; /* rotation of the colormap */
int fax_state; /* one of FAX_APT, FAX_PHAS or FAX_RX */
char *core_dta; /* storage for raw demodulated data (accumulating) */
char *core_start; /* start of core for image-processing */
char *core_wptr; /* pointer to next written element in core_dta */
char *core_maxptr; /* pointer beyond the last element in core_dta */
void (*disp_func)(int); /* pointer to function displaying the data-stream */
int (*save_func)(int, int);
/* pointer to function saving image to file */
void (*fax_tx_func)(int); /* pointer to function transmitting image */
int disp_locked; /* flag indicating that disp_func should not be called
from fax_rx_backgnd */
int save_locked; /* same as above for save_func */
void (*apt_notify)(int); /* pointer to function evaluating APT frequency */
unsigned smplf; /* number of samples per second << 16 */
unsigned smpl_line; /* number of samples per line << 16 */
unsigned hsmpl_sec; /* half the number of samples per second */
int aptncmax; /* maximum "empty" points in an APT-line */
int phstate = 0; /* state (0=waiting, 1=active) of phase-finder */
int phlines; /* number of recognized phase-lines */
unsigned hsmpl_line; /* half the number of samples per line */
int phposa[24]; /* phase position A (middle of line) */
int phposb[24]; /* phase position B (edges of line) */
int phsdir[24]; /* phase direction (beginning or end of line) */
int phaseavg; /* average phase position calculated */
char *demod_ptr; /* pointer to raw demodulated data */
int demod_cnt; /* number of decoded points per call */
char *mod_ptr; /* pointer to raw data being modulated */
char *mod_end; /* pointer to first byte behind end of modulator-space */
FILE *fsfile; /* file pointer of current save-file */
char faxsavename[256]; /* current name of save-file */
char *saveline; /* storage for 1 image-line in save_func */
XtAppContext mainapp; /* main app.context (needed for interv.timer) */
XtIntervalId chstime; /* for the repetitive called background function */
XtInputId dspxid = 0; /* for the background function when using select() */
XEvent event; /* event needed to form the XtAppMainLoop */
unsigned twidth; /* width of transmitted image */
unsigned theight; /* height of transmitted image */
int tx_phlines; /* number of phase-in lines to be transmitted */
char *timg_ptr; /* array holding image to be transmitted (pixel oriented) */
FILE *ftfile; /* pointer to file-struct for transmission */
/*
* init_fax initializes the "core"-space where the raw decoded data resides.
* This practice is not very nice to memory-limited systems, but has the
* advantage of being able to back up from nearly any setup-error (including
* wrong lpm, IOC, direction and color-mode but excluding tuning-errors)
*/
void init_fax(void)
{
if (fax_inited) return;
fprintf(stderr, "initializing FAX procedures and alloc'ing core-space\n");
lpm = 120;
ixoc = 288;
devi = 400;
mod_mode = MOD_FM | FIL_MIDL;
dmaxval = 63;
compval = dmaxval >> 1;
core_dta = malloc(CORESIZE);
core_start = core_dta;
core_wptr = core_dta;
core_maxptr = core_dta + COREMAX;
interface_init(&demod_ptr, &demod_cnt);
setup_mode(mod_mode, dmaxval, devi, &smplf);
hsmpl_sec = smplf >> 17;
aptncmax = hsmpl_sec / 25;
mod_end = demod_ptr + demod_cnt;
mod_ptr = demod_ptr;
fprintf(stderr, "smplf = %08x (16.16), demod_cnt = %d\n", smplf, demod_cnt);
disp_func = decode_fax_gray;
fax_tx_func = transmit_fax_gray;
save_func = save_fax_gray;
fsfile = NULL;
saveline = NULL;
apt_notify = apt_control;
chstime = (XtIntervalId) 0;
timg_ptr = NULL;
ftfile = NULL;
fax_inited = 1;
}
/* exit_fax frees the core_dta space, so that other program-parts may
allocate memory without having a dead-space overhead.
*/
void exit_fax(void)
{
if (!fax_inited) return;
free(core_dta);
fax_inited = 0;
}
/*
* setup_fax sets up all the variables for FAX-reception and transmission.
* s_lpm : lines per minute (no change if set to 0)
* s_ixoc: IOC to use (pixels per line = PI * IOC) (no change if set to 0)
* mode : fax-specific mode setings such as writing direction and order,
* phase-in polarity and grayscale or color-mode
* s_devi: deviation to use for FM (no change if set to 0)
* s_modem : (de-)modulator-specific settings as filter to use, AM or FM
*/
void setup_fax(int s_lpm, int s_ixoc, unsigned mode,
Widget toplevel, unsigned width, unsigned height,
int s_devi, unsigned s_modem)
{
unsigned id;
unsigned filter, mmode;
void (*old_func)(int);
/* be sure initialisation is done */
init_fax();
mainapp = XtWidgetToApplicationContext(toplevel);
/* if size is given or has changed, re-create X-images */
if ((width) || (height)) {
if (width)
canwid = width;
if (height)
canhei = height;
create_images(toplevel, canwid, canhei);
}
/* check if the (de-)modulator needs readjustment */
filter = s_modem & FIL_MASK;
mmode = s_modem & MOD_BITS;
if ((filter) || (mmode) || (s_devi)) {
fprintf(stderr, "setting filter & mmode = 0x%04x\n", (filter | mmode));
if (s_devi) {
if (s_devi < 100) s_devi = 100;
if (s_devi > 1200) s_devi = 1200;
devi = s_devi;
}
setup_mode((filter | mmode), dmaxval, s_devi, &smplf);
hsmpl_sec = smplf >> 17;
aptncmax = hsmpl_sec / 25;
if (filter)
{
mod_mode = (~FIL_MASK & mod_mode) | filter;
}
if (mmode)
{
mod_mode = (~MOD_BITS & mod_mode) | mmode;
}
}
if (s_lpm) {
if (s_lpm < 60) s_lpm = 60;
if (s_lpm > 500) s_lpm = 500;
lpm = s_lpm;
fprintf(stderr, "changing lpm to %d\n", lpm);
}
if (s_ixoc) {
if (s_ixoc < 60) s_ixoc = 60;
if (s_ixoc > 600) s_ixoc = 600;
ixoc = s_ixoc;
fprintf(stderr, "changing ioc to %d\n", ixoc);
}
if ((id = mode & FAX_POL)) {
if (id == FAX_CNOR) {
invimage = 0;
} else {
invimage = 1;
}
fprintf(stderr, "setting invimage mode to %d\n", invimage);
}
if ((id = mode & FAX_CFLS)) {
if (id == FAX_CUNFL) {
flip = 0;
} else {
flip = 1;
}
fprintf(stderr, "setting color-flip to %d\n", flip);
}
if ((id = mode & FAX_CROTS)) {
switch(id) {
case FAX_CROT0:
rotate = 0;
break;
case FAX_CROT1:
rotate = 1;
break;
case FAX_CROT2:
rotate = 2;
break;
}
fprintf(stderr, "setting color-rotation to %d\n", rotate);
}
if ((id = mode & FAX_DIR)) {
if (id & FAX_TOP2BOT)
bot2top = 0;
else if (id & FAX_BOT2TOP)
bot2top = 1;
if (id & FAX_LEF2RIG)
right2left = 0;
else if (id & FAX_RIG2LEF)
right2left = 1;
fprintf(stderr, "changing direction to h=%d, v=%d\n", right2left, bot2top);
}
if ((id = mode & FAX_ROT)) {
if (id == FAX_HOR) {
vertical = 0;
} else {
vertical = 1;
}
fprintf(stderr, "selecting %s direction\n",
(vertical) ? "vertical" : "horizontal");
}
if ((id = mode & FAX_PHS)) {
if (id == FAX_PWHT) {
invphase = 1;
} else {
invphase = 0;
}
fprintf(stderr, "phase inversion mode = %d\n", invphase);
}
if ((id = mode & FAX_CMODE)) {
switch (id) {
case FAX_GRAY:
mcolor = 0;
break;
case FAX_COLOR:
mcolor = 1;
break;
}
fprintf(stderr, "receive mode is %s\n", (mcolor) ? "color" : "grayscale");
}
/* now, all modifications to variables are done.
some recomputations are to be done dependant on what has changed... */
if (mode & FAX_CMODS)
if (mcolor) {
fill_cmap_col(invimage, flip, rotate);
} else {
fill_cmap_gray(invimage);
}
if ((mode & (FAX_DIR | FAX_ROT | FAX_CMODE | FAX_CMODS))
|| (s_ixoc) || (s_lpm) || (width) || (height)
|| (s_modem & MOD_BITS)) {
if (mcolor) {
disp_func = decode_fax_gray;
save_func = save_fax_gray;
} else {
disp_func = decode_fax_gray;
save_func = save_fax_gray;
}
/* recomputations are done in disp_func() */
fprintf(stderr, "initializing disp_func\n");
disp_func(D_CPINIT | D_WDINIT | D_LDINIT);
/* now call function to re-create picture */
#if stillneeded /* the disp_func should lock itself */
old_func = disp_func;
disp_func = NULL;
fprintf(stderr, "calling disp_func to re-display image\n");
old_func(D_ALLOWX);
disp_func = old_func;
#else
fprintf(stderr, "calling disp_func to re-display image\n");
disp_func(D_ALLOWX);
#endif
}
if ((mmode) && (dspxid != 0))
{
/* re-initiate data reception, because changing the modulation mode
* (and thus changing the sample rate) requires the data stream to
* stop. [Later, this should be RX or TX depending on what we do] */
fax_rx_backgnd((XtPointer) NULL, &dspfd, (XtInputId *) NULL);
}
}
/* enable FAX reception: set auto-initializing background function */
void receive_on(void)
{
#ifndef DSP_SELECT
if (chstime != (XtIntervalId) 0) return;
#endif
fax_state = FAX_APT;
mode_notify(fax_state);
#ifdef DSP_SELECT
dspxid = XtAppAddInput(mainapp, dspfd, (XtPointer) XtInputReadMask,
fax_rx_backgnd, (XtPointer) NULL);
fprintf(stderr, "dspxid from XtAppAddInput is %ld\n", dspxid);
/* initiate the reading of data. Once started, it is called by
* XtAppMainLoop() which uses select() to listen on dspfd. */
fax_rx_backgnd((XtPointer) NULL, &dspfd, &dspxid);
#else
chstime = XtAppAddTimeOut(mainapp, 250, fax_rx_backgnd, (XtPointer) NULL);
#endif
}
void receive_off(void)
{
#ifdef DSP_SELECT
XtRemoveInput(dspxid);
dspxid = (XtInputId) 0;
#else
XtRemoveTimeOut(chstime);
#endif
interface_stop();
chstime = (XtIntervalId) 0;
}
#ifdef DSP_SELECT
/* this is the reception routine triggered upon input from DSP device */
void fax_rx_backgnd(XtPointer client_data, int *source, XtInputId *xid)
#else
/* this is the reception routine which calls itself after 250ms */
void fax_rx_backgnd(XtPointer client_data, XtIntervalId *xid)
#endif
{
int space;
/*
if (init_rx) {
init_rx = 0;
core_wptr = core_dta;
}
*/
/*
fprintf(stderr, "receiving data\n");
*/
/* get the input samples and demodulate the input data stream */
do_receive();
/* update the signal-level scrollbar display */
set_sigdisplay((double)rx_level / 255.0);
/* always watch for APT frequencies */
/*
fprintf(stderr, "decoding APT\n");
*/
decode_apt(0);
/* if we are in the phasing state, compute the phase-position */
if (fax_state == FAX_PHAS)
sync_phase(0);
/* copy the data into the core_dta array and advance the write-pointer */
if (fax_state == FAX_RX) {
space = core_maxptr - core_wptr;
if (space > demod_cnt)
space = demod_cnt;
memcpy(core_wptr, demod_ptr, space);
core_wptr += space;
}
#ifdef DSP_SELECT
/* we don't need to retrigger ourself - do nothing */
#else
/* add a new timeout to call this function again */
/*
printf("adding new timeout\n");
*/
chstime = XtAppAddTimeOut(mainapp, 250, fax_rx_backgnd, (XtPointer) NULL);
#endif
/* if disp_func is set, call that function (e.g. main FAX decoder loop) */
if ((disp_func) && !(disp_locked)) {
/*
fprintf(stderr, "calling disp_func\n");
*/
disp_func(0);
}
/* if save_func is set (saving of received image enabled), call function */
if ((save_func) && !(save_locked)) {
/*
fprintf(stderr, "calling save_func\n");
*/
save_func(F_DOSAVE, 0);
}
}
/*
* grayscale FAX decoding main routine.
* init is used to control the behavior and initialize some internal
* variables. It is bit-wise coded as follows :
* D_CPINIT : initialize read-pointer to start of core-buffer
* D_WDINIT : initialize x-position to the start-value
* D_LDINIT : initialize y-position to the start-value
* D_ALLOWX : periodically call XtAppProcessEvent during processing
* (requires that this function is NOT called from fax_rx_backgnd !)
*/
void decode_fax_gray(int init)
{
XtInputMask msk;
#ifdef FAST8BIT
static char *imptr;
static char *imptinit;
static int impinc;
#endif
/* pointer to sample-point for current pixel and current start-of-line */
static char *core_line, *core_pix;
/* sample-values per line or per pixel-value, 16bit int, 16bit frac */
static unsigned inc_pix, inc_line;
/* current index to pixel or line in sample-array, 16bit int, 16bit frac */
static unsigned idx_pix, idx_line, idx_p0;
/* increment between actual and previous pixel/line position */
static unsigned ipix, iline;
/* pixel-in-line-position start/increment/end */
static int pixinit, pixinc, pixend;
/* line-in-image-position start/increment/end, max. line of XImage */
static int lineinit, lineinc, lineend, imgmax;
static int (*put_pix)(struct _XImage *, int, int, unsigned long);
if (init & D_INITS) {
/* smpl_line is the number of core_dta points per line << 16 */
smpl_line = 60.0 / lpm * smplf;
if (vertical) {
inc_pix = smpl_line / canhei;
inc_line = (int)(ixoc * M_PI * 65536.0 / canhei);
imgmax = DEFWIDTH;
put_pix = verimag->f.put_pixel;
} else {
inc_pix = smpl_line / canwid;
inc_line = (int)(ixoc * M_PI * 65536.0 / canwid);
imgmax = DEFHEIGHT;
put_pix = horimag->f.put_pixel;
}
if (!(vertical) && (right2left)) {
pixinit = canwid - 1;
pixinc = -1;
pixend = -1;
#ifdef FAST8BIT
imptinit = horimag->data + canwid - 1;
impinc = -1;
#endif
} else
if ((vertical) && (bot2top)) {
pixinit = canhei - 1;
pixinc = -1;
pixend = -1;
#ifdef FAST8BIT
imptinit = verimag->data + (canhei - 1) * verimag->bytes_per_line;
impinc = -verimag->bytes_per_line;
#endif
} else {
pixinit = 0;
pixinc = 1;
pixend = (vertical) ? canhei : canwid;
#ifdef FAST8BIT
imptinit = (vertical) ? verimag->data : horimag->data;
impinc = (vertical) ? verimag->bytes_per_line : 1;
#endif
}
/* initialize the line-advance variables and pointers */
if (!(vertical) && (bot2top)) {
lineinit = canhei - DEFHEIGHT;
lineinc = -1;
lineend = -1;
} else
if ((vertical) && (right2left)) {
lineinit = canwid - DEFWIDTH;
lineinc = -1;
lineend = -1;
} else {
lineinit = 0;
lineinc = 1;
lineend = (vertical) ? canwid : canhei;
}
if (init & D_WDINIT) {
pixpos = pixinit;
}
if (init & D_LDINIT) {
linepos = lineinit;
if ((!(vertical) && (bot2top)) || ((vertical) && (right2left)))
imline = imgmax - 1;
else
imline = 0;
}
#ifdef FAST8BIT
if ((init & D_LDINIT) || (init & D_WDINIT)) {
imptr = imptinit + impinc * pixpos;
if (vertical)
imptr += imline;
else
imptr += horimag->bytes_per_line * imline;
}
#endif
if (init & D_CPINIT) {
/* initialize the fractional index pointers */
idx_pix = idx_line = idx_p0 = 0;
core_pix = core_line = core_start;
ipix = iline = 0;
}
fprintf(stderr,"initialisation done :\n"
"pixinit = %d, pixinc = %d, pixend = %d\n"
"lineinit = %d, lineinc = %d, lineend = %d\n"
"imline = %d, imgmax = %d\n",
pixinit, pixinc, pixend,
lineinit, lineinc, lineend,
imline, imgmax);
disp_locked = 0;
return;
}
if (init & D_ALLOWX) {
printf("redrawing from %d, %d, corepos = %d\n", pixpos, linepos, core_pix - core_dta);
}
disp_locked = 1;
do {
/* if it is better to wait for more data, cancel function and wait
until it is called next time */
if (core_pix >= core_wptr)
break;
/* enter a new brightness-value (0..63) into core_dta */
#ifdef FAST8BIT
*imptr = coltab[*(unsigned char *)core_pix];
imptr += impinc;
#else
if (vertical)
put_pix(verimag, imline, pixpos, coltab[*(unsigned char *)core_pix]);
else
put_pix(horimag, pixpos, imline, coltab[*(unsigned char *)core_pix]);
#endif
/* shift the x-position, and if we have reached the end... */
pixpos += pixinc;
if (pixpos == pixend) {
/* re-start from left border */
pixpos = pixinit;
/* now we have one more complete line, copy it from core_dta to the
horimag (an Ximage). Use fast methode by advancing pointers */
/* check if we wave filled up all lines of horimag, or if we just
have got as many lines that we can complete the picture. */
imline += lineinc;
if ((imline == imgmax) || (imline < 0) || (linepos + imline == lineend)) {
while ((init & D_ALLOWX) && ((msk = XtAppPending(mainapp)))) {
XtAppProcessEvent(mainapp, msk);
}
if (vertical)
if (right2left) {
update_area(verimag, 0, 0, linepos, 0, (DEFWIDTH-1) - imline, canhei);
} else {
update_area(verimag, 0, 0, linepos, 0, imline, canhei);
}
else
if (bot2top) {
update_area(horimag, 0, 0, 0, linepos, canwid, (DEFHEIGHT-1) - imline);
} else {
update_area(horimag, 0, 0, 0, linepos, canwid, imline);
}
if (((vertical) && (right2left)) || (!(vertical) && (bot2top))) {
imline = imgmax - 1;
linepos -= imgmax;
if (linepos < 0)
linepos = lineinit;
} else {
imline = 0;
linepos += imgmax;
if (linepos >= lineend)
linepos = 0;
}
}
#ifdef FAST8BIT
if (vertical)
imptr = imptinit + imline;
else
imptr = imptinit + horimag->bytes_per_line * imline;
#endif
idx_line += inc_line;
iline = (idx_line >> 16) & 0xffff;
idx_line &= 0xffff;
core_line += iline * ((smpl_line >> 16) & 0xffff);
/* we must also initialize the pixel-counters here ! */
idx_p0 += iline * (smpl_line & 0xffff);
core_line += (idx_p0 >> 16) & 0xffff;
core_pix = core_line;
idx_p0 &= 0xffff;
idx_pix = idx_p0;
ipix = 0;
/* jump over the stuff below... */
continue;
}
/* shift the sample-point (16 bits integer, 16 bits fractional part) */
idx_pix += inc_pix;
ipix = (idx_pix >> 16) & 0xffff;
core_pix += ipix;
idx_pix &= 0xffff;
} while (1);
if (init & D_FLUSHIMG) {
if (vertical)
if (right2left) {
update_area(verimag, 0, 0, linepos, 0, (DEFWIDTH-1) - imline, canhei);
} else {
update_area(verimag, 0, 0, linepos, 0, imline, canhei);
}
else
if (bot2top) {
update_area(horimag, 0, 0, 0, linepos, canwid, (DEFHEIGHT-1) - imline);
} else {
update_area(horimag, 0, 0, 0, linepos, canwid, imline);
}
}
disp_locked = 0;
}
/*
* this function should be used by the main program to initiate saving
* of an image. If name is not given, it is constructed of date and time.
*/
int save_faxfile(char *name, int width)
{
time_t tp;
char date[16]; /* string to build date for automatic savefile-name */
/* check if save-file is already open */
if (fsfile)
return SAVE_BUSY;
/* if no name is given, generate autosave-filename from date and time */
if (name) {
strcpy(faxsavename, name);
} else {
time(&tp);
strftime(date, 14, "%m.%d-%H:%M", localtime(&tp));
sprintf(faxsavename, "%s/faxsave_%s.pgm", FAX_SAVEDIR, date);
}
return save_func(F_OPEN, width);
}
/* properly close the save-file */
void close_faxsave(void)
{
if (!(fsfile))
return;
save_func(F_GETDIM, 0);
save_func(F_DOSAVE, 0);
save_func(F_CLOSE, 0);
}
/*
* fax-image saving function, writes grayscale ppm-images (pgm).
* The image cannot be rotated, only flipped in writing-direction.
* init defines the action to be done :
* F_DOSAVE : save image if file is opened, close when completed
* F_OPEN : open file, faxsavename contains the name and width the width
* of the image. If width is not given, the best resolution is taken
* (width = PI * IOC)
* F_CLOSE : close file and adjust data in header to actual values
* F_GETDIM : get dimensions and parameters of image into internal variables
* the filename must previously be put into faxsavename.
*/
int save_fax_gray(int init, int width)
{
XtInputMask msk;
/* width and height of saved image */
static unsigned swidth, sheight;
static char *ldptr, *ldpinit, *ldpend;
static int ldpinc;
/* end of picture in core-space */
static char *save_wptr = NULL;
/* pointer to sample-point for current pixel and current start-of-line */
static char *core_line, *core_pix;
/* sample-values per line or per pixel-value, 16bit int, 16bit frac */
static unsigned inc_pix, inc_line;
/* current index to pixel or line in sample-array, 16bit int, 16bit frac */
static unsigned idx_pix, idx_line, idx_p0;
/* increment between actual and previous pixel/line position */
static unsigned ipix, iline;
/* pixel-in-line-position start/increment/end */
/*
static int pixinit, pixinc, pixend;
*/
/* line-in-image-position start/increment/end, max. line of XImage */
/*
static int lineinit, lineinc, lineend, imgmax;
*/
/* whether the writing-direction must be reversed */
static int flip;
int pos;
if (init == F_OPEN) {
/* close "old" file first */
if (fsfile)
save_fax_gray(F_CLOSE, 0);
if (width > 0)
swidth = width;
else
swidth = (ixoc * M_PI) + 0.5;
fsfile = fopen(faxsavename, "wb");
if (!(fsfile)) {
return SAVE_NPERM;
}
fprintf(stderr, "save file \"%s\", %d pix/line\n", faxsavename, swidth);
fputs("P5\nxxxxx\nyyyyy\n63\n", fsfile);
/* allocate space for the one line */
saveline = malloc(swidth + 4);
/* do not initialize too much here, the user may change parameters
of the picture while receiving... */
save_wptr = NULL;
return SAVE_OK;
} else if (init == F_CLOSE) {
if (!(fsfile))
return SAVE_OK; /* no save-file open, doesn't matter */
fprintf(stderr,"closing savefile\n");
pos = ftell(fsfile);
sheight = sypos;
rewind(fsfile);
fprintf(fsfile, "P5\n%05u\n%05u\n", swidth, sheight);
fseek(fsfile, pos, SEEK_SET);
fclose(fsfile);
fsfile = NULL;
if (saveline)
free(saveline);
save_wptr = NULL;
return SAVE_OK;
} else if (init == F_GETDIM) {
if (!(fsfile))
return SAVE_NFILE; /* no save-file open, can't get dimensions */
/* now initialize all the variables... */
fprintf(stderr, "getting image settings...");
inc_pix = smpl_line / swidth;
inc_line = (int)(ixoc * M_PI * 65536.0 / swidth);
idx_pix = idx_line = idx_p0 = 0;
core_pix = core_line = core_start;
save_wptr = core_wptr;
ipix = iline = 0;
flip = (vertical) ? 1 : 0;
if (bot2top) flip ^= 1;
if (right2left) flip ^= 1;
if (flip) {
ldpinit = saveline + (swidth - 1);
ldpinc = -1;
ldpend = saveline - 1;
} else {
ldpinit = saveline;
ldpinc = 1;
ldpend = saveline + swidth;
}
ldptr = ldpinit;
sypos = 0;
sheight = 0;
return SAVE_OK;
}
/* no open save-file, or variables not initialized, so return */
if (!(fsfile) || !(save_wptr)) return SAVE_NFILE;
save_locked = 1;
fprintf(stderr,"saving image...");
while (core_pix < save_wptr) {
if (invimage)
*ldptr = dmaxval - *(unsigned char *)core_pix;
else
*ldptr = *(unsigned char *)core_pix;
ldptr += ldpinc;
if (ldptr == ldpend) {
ldptr = ldpinit;
sypos++;
fwrite(saveline, swidth, 1, fsfile);
while ((msk = XtAppPending(mainapp))) {
XtAppProcessEvent(mainapp, msk);
}
idx_line += inc_line;
iline = (idx_line >> 16) & 0xffff;
idx_line &= 0xffff;
core_line += iline * ((smpl_line >> 16) & 0xffff);
/* we must also initialize the pixel-counters here ! */
idx_p0 += iline * (smpl_line & 0xffff);
core_line += (idx_p0 >> 16) & 0xffff;
core_pix = core_line;
idx_p0 &= 0xffff;
idx_pix = idx_p0;
ipix = 0;
/* jump over the stuff below... */
continue;
}
idx_pix += inc_pix;
ipix = (idx_pix >> 16) & 0xffff;
core_pix += ipix;
idx_pix &= 0xffff;
}
fprintf(stderr,"done.\n");
save_locked = 0;
return SAVE_OK;
}
/* called when save-function has terminated writing */
void faxsave_complete(int init)
{
/* this makes save_func call itself recursively, but should not hurt */
save_func(F_CLOSE, 0);
}
/*
* wait for a phasing signal, keep track of the phase-pulses, and preset
* core_start on end of the phase_signal. This is done by correlating the
* digitized gray-values (reduced to 1 or 0) with two sawtooth-signals,
* each with a periode of one scan line, and one of them shifted by a
* half scan-line against the other. This lets us find the position of
* the phase-pulse relative to our scan-line. Lines are recognized as
* phase-in-lines when they contain at most 3/32 and at least 1/32 of values
* that are above (or below for inverse phase) the middle of the gray-scale.
*/
void sync_phase(int init)
{
/* run counters, count pixels per line (16bit int, 16bit frac) */
static int phsarc, phsbrc;
/* accumulators for the integration */
static int phsaacc = 0, phsbacc = 0;
/* these are counted up until limit to form the sawtooth-signal */
static int phsainc, phsbinc;
/* number of sample-points processed */
static int npoints = 0;
/* number of points having the right level (black) for a sync pulse */
static int nphpts = 0;
/* minimum/maximum number of black points per line that must be present */
static int minphpts, maxphpts;
static char done = 0;
char *dtaptr;
int pcnt;
int i,j;
dtaptr = demod_ptr;
pcnt = demod_cnt;
if (init) {
phstate = 0;
hsmpl_line = smpl_line >> 17;
phsaacc = phsbacc = 0;
phsarc = smpl_line;
phsbrc = smpl_line >> 1;
phsainc = - hsmpl_line;
phsbinc = 0;
minphpts = (smpl_line >> 16) >> 5;
maxphpts = minphpts * 3;
nphpts = 0;
phlines = 0;
done = 0;
core_wptr = core_dta;
core_start = core_dta;
fprintf(stderr, "initialized sync-phase-detector\n");
return;
}
while (pcnt > 0) {
if ((!(invphase) && *dtaptr > compval) ||
((invphase) && *dtaptr < compval)) {
phsaacc += phsainc;
phsbacc += phsbinc;
nphpts++;
}
phsainc++;
phsbinc++;
npoints++;
dtaptr++;
pcnt--;
phsarc -= 65536;
if (phsarc <= 0) {
done = 1; /* this indicates the end-of-line */
phsarc += smpl_line;
phsainc = - hsmpl_line;
}
phsbrc -= 65536;
if (phsbrc <= 0) {
phsbrc += smpl_line;
phsbinc = - hsmpl_line;
}
if (done) {
#if (DEBUG & DBG_SYN)
fprintf(stderr, "got line with %d of %d points phase-value\n",
nphpts, npoints);
#endif
/* check if it was probably a phase-in line */
if (nphpts < maxphpts && nphpts > minphpts) {
if (phlines < 24) {
/* use the accumulator with the lower absolute-value */
if (abs(phsaacc) < abs(phsbacc)) {
i = phsaacc / nphpts;
#if (DEBUG & DBG_SYN)
fprintf(stderr, "sync line %d: A=%d\n", phlines, i);
#endif
phposa[phlines] = i;
if (i < 0)
phsdir[phlines] = 1; /* left half */
else
phsdir[phlines] = 0; /* right half */
} else {
i = phsbacc / nphpts;
#if (DEBUG & DBG_SYN)
fprintf(stderr, "sync line %d: B=%d\n", phlines, i);
#endif
phposb[phlines] = i;
if (i < 0)
phsdir[phlines] = 2; /* right half */
else
phsdir[phlines] = 3; /* left half */
}
if (phstate == 0) { /* first sync line */
phstate = 1;
} else if (phstate == 1) { /* any sync line */
}
phlines++;
} else { /* phlines >= 24 */
/* ignore any further sync-lines... */
}
} else {
/* no sync line, we are still waiting for one or they have passed */
if (phstate == 0) {
/* no sync line yet - just wait ?! */
} else if (phstate == 1) {
/* now begin to compute the ultimate sync-position */
j = 0;
/* count the lines in the left half */
for (i=0; i<phlines; i++) {
if (phsdir[i] & 1) j++;
}
phaseavg = 0;
if (j > (phlines >> 1)) { /* more points in the left half */
#if (DEBUG & DBG_SYN)
fprintf(stderr, "calculating for left half...\n");
#endif
for (i=0; i<phlines; i++)
if (phsdir[i] & 2)
phaseavg += phposb[i] - hsmpl_line;
else
phaseavg += phposa[i];
} else { /* more points in the right half */
#if (DEBUG & DBG_SYN)
fprintf(stderr, "calculating for right half...\n");
#endif
for (i=0; i<phlines; i++)
if (phsdir[i] & 2)
phaseavg += phposb[i] + hsmpl_line;
else
phaseavg += phposa[i];
}
phaseavg /= phlines;
phaseavg += hsmpl_line;
#if (DEBUG & DBG_SYN)
fprintf(stderr, "phase average = %d\n", phaseavg);
#endif
/* now prepare the core_start pointer for reception */
/* calculate difference from sync-pos to end of line */
j = (smpl_line >> 16);
i = demod_cnt - pcnt + phaseavg;
if (i > j)
i -= j;
/* start decoding at the beginning of the core */
core_wptr = core_dta;
core_start = core_dta + i;
/* now enter the real reception mode. When returning into the
fax_rx_backgnd, fax_state is set to FAX_RX so that the data
we just processed can also be used for the picture. */
fax_rx_start(1);
/* no more data to process */
return;
}
} /* if (sync_line_detected) */
/* re-initialize the both accumulators and sample-point counters */
phsaacc = 0;
phsbacc = 0;
npoints = 0;
nphpts = 0;
done = 0;
} /* if (done) */
} /* while (pcnt > 0) */
}
/*
* calculate the APT frequency by counting low->high->low transitions.
* not very nice, but it works :-S . This funcion always computes the
* APT for 0.5 seconds, independant from demod_cnt, which can be very
* high on systems that use a large block-size for the audio-devide.
* After each calculation, apt_notify() is called with the frequency as
* argument.
*/
void decode_apt(int dummy)
{
/* how many transitions (half-waves) we have counted */
static int apthws = 0;
/* how many consecutive points were on one side of the comparator-value */
static int aptncact = 0;
/* the phase (black or white) we processed last time */
static int phs = 0;
static int npoints = 0;
char *dtaptr;
int pcnt;
dtaptr = demod_ptr;
pcnt = demod_cnt;
/* If we have to start with the "black" phase, do it before the main-loop
starts. This prevents us from ugly goto's (shudder) */
if (phs) {
while (pcnt) {
pcnt--;
if (++npoints >= hsmpl_sec) {
apt_notify(apthws);
apthws = 0;
npoints = 0;
}
if (*(unsigned char *)dtaptr++ <= compval) {
if (aptncact > aptncmax)
apthws = 0;
else
apthws++;
break;
}
aptncact++;
}
}
while (pcnt > 0) {
aptncact = 0;
while (pcnt) {
pcnt--;
if (++npoints >= hsmpl_sec) {
#if (DEBUG & DBG_APT)
fprintf(stderr,"APT freq. pos = %d\n", apthws);
#endif
apt_notify(apthws);
apthws = 0;
npoints = 0;
}
if (*(unsigned char *)dtaptr++ > compval) {
if (aptncact > aptncmax)
apthws = 0;
else
apthws++;
break;
}
aptncact++;
}
aptncact = 0;
while (pcnt) {
pcnt--;
if (++npoints >= hsmpl_sec) {
#if (DEBUG & DBG_APT)
fprintf(stderr,"APT freq. neg = %d\n", apthws);
#endif
apt_notify(apthws);
apthws = 0;
npoints = 0;
}
if (*(unsigned char *)dtaptr++ <= compval) {
if (aptncact > aptncmax)
apthws = 0;
else
apthws++;
break;
}
aptncact++;
}
}
/* now mark the phase for the next call... */
if (*(unsigned char *)(dtaptr-1) <= compval)
phs = 0;
else
phs = 1;
}
void apt_control(int aptfrq)
{
static int cnt;
/*
fprintf(stderr, "apt_control: %d\n", aptfrq);
*/
switch (fax_state) {
/* wait for one of the valid APT frequencies */
case FAX_APT:
if (abs(aptfrq - aptstart) < 2) {
if (++cnt >= 2) fax_rx_phase(1);
} else {
cnt = 0;
}
break;
/* here, a new start or a stop (interrupt) may occur */
case FAX_PHAS:
case FAX_RX:
if (abs(aptfrq - aptstop) < 2) {
if (++cnt >= 2) fax_rx_stop(1);
} else {
cnt = 0;
}
break;
}
}
void fax_rx_start(int internal)
{
fprintf(stderr,"starting fax reception\n");
/* if we come from phasing, initialize disp_func */
if (fax_state == FAX_PHAS)
disp_func(D_CPINIT | D_WDINIT | D_LDINIT);
fax_state = FAX_RX;
if (internal)
mode_notify(fax_state);
}
void fax_rx_phase(int internal)
{
fprintf(stderr,"entering phase-in mode\n");
sync_phase(1);
fax_state = FAX_PHAS;
if (internal)
mode_notify(fax_state);
}
void fax_rx_stop(int internal)
{
fprintf(stderr,"stopping fax reception\n");
fax_state = FAX_APT;
/* flush rest of image (in horimag/verimag) */
disp_func(D_FLUSHIMG);
/* get current image-parameters for saving */
save_func(F_GETDIM, 0);
save_func(F_DOSAVE, 0);
save_func(F_CLOSE, 0);
if (internal)
mode_notify(fax_state);
}
/*
* this function is called by the callback-function of the Canvas-widget
* to move the picture in writing-direction, when phasing in has failed
* or was missed. px and py contain the coordinates of the button-press.
*/
void shift_fax_coords(unsigned px, unsigned py)
{
void (*old_func)();
unsigned tmp_pos;
fprintf(stderr, "coords = %d, %d\n", px, py);
old_func = disp_func;
disp_func = NULL;
if (vertical) {
if (bot2top)
tmp_pos = smpl_line / canhei * (canhei - py);
else
tmp_pos = smpl_line / canhei * py;
} else {
if (right2left)
tmp_pos = smpl_line / canwid * (canwid - px);
else
tmp_pos = smpl_line / canwid * px;
}
core_start += (tmp_pos >> 16);
tmp_pos = (smpl_line >> 16);
if (core_start - core_dta > tmp_pos)
core_start -= tmp_pos;
old_func (D_CPINIT | D_WDINIT | D_LDINIT);
old_func (D_ALLOWX);
disp_func = old_func;
}
/*
* this function is called by the callback-function of the Canvas-widget
* to re-adjust the sampling frequency to correct the line-shifting
* caused by slightly deadjusted samling frequency.
*/
void correct_fax_azimut(int dx, int dy)
{
void (*old_func)();
int flip;
int df;
fprintf(stderr, "coords = %d, %d\n", dx, dy);
flip = 0;
if (right2left) flip ^= 1;
if (bot2top) flip ^= 1;
if (vertical) {
df = (smplf * (double)dy) / (dx * M_PI * ixoc);
} else {
df = (smplf * (double)dx) / (dy * M_PI * ixoc);
}
if (flip) df = -df;
smplf += df;
fprintf(stderr, "delta freq.=%2.3f smplf=%4.3f\n",
(double)df / 65536.0, (double)smplf / 65536.0);
tune_frequency(smplf);
old_func = disp_func;
disp_func = NULL;
old_func (D_CPINIT | D_WDINIT | D_LDINIT);
old_func (D_ALLOWX);
disp_func = old_func;
}
/*----------------------- FAX transmission --------------------------*/
void fax_tx_stop(int internal)
{
fprintf(stderr,"stopping FAX-transmission\n");
if (internal)
mode_notify(fax_state);
}
void fax_tx_start(int internal)
{
fprintf(stderr,"transmitting image\n");
fax_state = FATX_TX;
fax_tx_func(D_WDINIT | D_LDINIT);
if (internal)
mode_notify(fax_state);
}
void fax_tx_apta(int internal)
{
fprintf(stderr,"transmitting APT-start\n");
transmit_apt(APTX_ISTART);
fax_state = FATX_APTA;
if (internal)
mode_notify(fax_state);
}
void fax_tx_aptb(int internal)
{
fprintf(stderr,"transmitting APT-stop\n");
transmit_apt(APTX_ISTOP);
fax_state = FATX_APTB;
if (internal)
mode_notify(fax_state);
}
void fax_tx_phase(int internal)
{
fprintf(stderr,"entering TX-phase-in mode\n");
transmit_phase(1);
fax_state = FATX_PHAS;
if (internal)
mode_notify(fax_state);
}
int load_txfile(char *name)
{
char line[80];
char lctab[256];
char *pline, *sp;
int ncols;
int color;
char *cp;
int i,j;
if (timg_ptr)
free(timg_ptr);
if ((ftfile = fopen(name, "rb")) == NULL) {
perror("open_txfile");
return -1;
}
if (fgets(line, 79, ftfile) == NULL) {
perror("read_format");
return -1;
}
if (!strcmp(line, "P5\n"))
color = 0;
else if (!strcmp(line, "P6\n"))
color = 1;
else
return -2; /* unrecognized format */
if (color)
return -3; /* not yet supported */
do {
if (fgets(line, 79, ftfile) == NULL) {
perror("read_header");
return -1;
}
} while (*line == '#');
twidth = atoi(line);
if (fgets(line, 79, ftfile) == NULL) {
perror("read_header");
return -1;
}
theight = atoi(line);
if (fgets(line, 79, ftfile) == NULL) {
perror("read_header");
return -1;
}
timg_ptr = malloc(twidth*theight);
pline = malloc(twidth);
if (!(timg_ptr) || !(pline)) {
if (timg_ptr) free(timg_ptr);
if (pline) free(pline);
perror("alloc_txmem");
return -4;
}
ncols = atoi(line) + 1;
if (ncols > 256)
return -3;
for (i=0; i<ncols; i++)
lctab[i] = (64 * i) / ncols;
cp = timg_ptr;
for (i=0; i<theight; i++) {
if (fread(pline, twidth, 1, ftfile) != 1) {
perror("read_pixmap");
free(timg_ptr);
free(pline);
return -5;
}
sp = pline;
for (j=0; j<twidth; j++)
*cp++ = lctab[*(unsigned char *)sp++];
}
free(pline);
fclose(ftfile);
return 0;
}
/*
* Fax-transmission background-routine :
* This works a little different from the receiving-routine.
* Transmission-data is not stored in a core-space, it is
* transmitted directly out of the image-memory. Every function
* called here must keep track of the pointer in the decptr-space
* and give back control if the task is done or the pointer has reached
* the end of the buffer.
*/
#ifdef DSP_SELECT
void fax_tx_backgnd(XtPointer client_data, int *source, XtInputId *xid)
#else
void fax_tx_backgnd(XtPointer client_data, XtIntervalId *xid)
#endif
{
int space;
/* if we are in the phasing state, compute the phase-position */
if (fax_state == FATX_APTA)
transmit_apt(0);
if (fax_state == FATX_PHAS)
transmit_phase(0);
if (fax_state == FATX_TX)
fax_tx_func(0);
if (fax_state == FATX_APTB)
transmit_apt(0);
#ifdef DSP_SELECT
#else
/* add a new timeout to call this function again */
/*
printf("adding new timeout\n");
*/
chstime = XtAppAddTimeOut(mainapp, 250, fax_rx_backgnd, (XtPointer) NULL);
#endif
/* if disp_func is set, call that function (e.g. main FAX decoder loop) */
if ((disp_func) && !(disp_locked)) {
/*
fprintf(stderr, "calling disp_func\n");
*/
fax_tx_func(0);
}
/*
fprintf(stderr, "transmitting data\n");
*/
do_transmit();
}
void transmit_fax_gray(int init)
{
/* pointer to sample-point for current pixel and current start-of-line */
static char *timg_line, *timg_pix;
/* sample-values per line or per pixel-value, 16bit int, 16bit frac */
static unsigned inc_pix, inc_line, inc_p0;
/* current index to pixel or line in sample-array, 16bit int, 16bit frac */
static unsigned idx_pix, idx_line, idx_p0;
/* increment between actual and previous pixel/line position */
static unsigned ipix, iline;
/* pixel-in-line-position start/increment/end */
static int pixinit, pixinc, pixend;
/* line-in-image-position start/increment/end, max. line of XImage */
static int lineinit, lineinc, lineend, imgmax;
static int (*put_pix)(struct _XImage *, int, int, unsigned long);
/* bytes per line or per pixel, depends on direction (hor, vert, r2l, b2t) */
static int bytes_per_line, bytes_per_pixel;
if (init & D_INITS) {
/* smpl_line is the number of core_dta points per line << 16 */
smpl_line = 60.0 / lpm * smplf;
if (vertical) {
inc_pix = smpl_line / theight;
inc_line = (int)(ixoc * M_PI * 65536.0 / theight);
imgmax = DEFWIDTH;
put_pix = verimag->f.put_pixel;
bytes_per_pixel = twidth;
bytes_per_line = 1;
} else {
inc_pix = smpl_line / twidth;
inc_line = (int)(ixoc * M_PI * 65536.0 / twidth);
imgmax = DEFHEIGHT;
put_pix = horimag->f.put_pixel;
bytes_per_pixel = 1;
bytes_per_line = twidth;
}
if (!(vertical) && (right2left)) {
pixinit = twidth - 1;
pixinc = -1;
pixend = -1;
bytes_per_pixel = -bytes_per_pixel;
} else
if ((vertical) && (bot2top)) {
pixinit = theight - 1;
pixinc = -1;
pixend = -1;
bytes_per_pixel = -bytes_per_pixel;
} else {
pixinit = 0;
pixinc = 1;
pixend = (vertical) ? theight : twidth;
}
/* initialize the line-advance variables and pointers */
if (!(vertical) && (bot2top)) {
lineinit = theight - 1;
lineinc = -1;
lineend = -1;
bytes_per_line = -bytes_per_line;
} else
if ((vertical) && (right2left)) {
lineinit = twidth - 1;
lineinc = -1;
lineend = -1;
bytes_per_line = -bytes_per_line;
} else {
lineinit = 0;
lineinc = 1;
lineend = (vertical) ? twidth : theight;
}
}
if (init) {
timg_line = timg_ptr;
/* twidth, theight, timg_ptr */
if (vertical) {
inc_pix = 65536.0 * theight * lpm / ((60.0/65536.0) * smplf);
inc_line = 65536.0 * theight / (M_PI * ixoc);
} else {
inc_pix = 65536.0 * twidth * lpm / ((60.0/65536.0) * smplf);
inc_line = 65536.0 * twidth / (M_PI * ixoc);
}
if (right2left) {
pixinc = -1;
timg_line += (twidth - 1);
} else {
pixinc = 1;
}
if (bot2top) {
pixinc = -twidth;
timg_line += (theight - 1) * twidth;
} else {
pixinc = twidth;
}
timg_pix = timg_line;
inc_p0 = 0;
return;
}
while (mod_ptr < mod_end) {
*mod_ptr++ = *timg_pix;
pixpos += pixinc;
if (pixpos == pixend) {
pixpos = pixinit;
linepos += lineinc;
if (linepos == lineend) {
/* we have transmitted the entire picture ! */
break;
}
idx_line += inc_line;
iline = (idx_line >> 16) & 0xffff;
idx_line &= 0xffff;
timg_pix += bytes_per_pixel;
timg_pix += iline * twidth; /* twidth == bytes_per_line */
continue; /* jump over stuff below */
}
idx_pix += inc_pix;
ipix = (idx_pix >> 16) & 0xffff;
idx_pix &= 0xffff;
timg_pix += ipix * bytes_per_pixel;
}
fax_tx_aptb(1);
}
/*
* transmit an APT-tone. This function returns if either the pointer to
* decptr reaches the end of the buffer or the duration is reached.
* init can have the following values :
* APTX_ISTART: initialize for aptstart-frequency
* APTX_ISTOP: initialize for apt stop-frequency
* 0: start/continue transmission
*/
void transmit_apt(int init)
{
XtInputMask msk;
static int acc = 0;
static int ap_inc;
static int dur;
if (init == APTX_ISTART) {
ap_inc = 4.294967296e6 * aptstart / (double) smplf;
dur = (smplf >> 16) * aptdur / 1000;
return;
} else if (init == APTX_ISTOP) {
ap_inc = 4.294967296e6 * aptstop / (double) smplf;
dur = (smplf >> 16) * aptdur / 1000;
return;
}
while ((dur > 0) && (mod_ptr < mod_end)) {
acc += ap_inc;
if (acc & 0x8000)
*mod_ptr = dmaxval;
else
*mod_ptr = 0;
mod_ptr++;
dur--;
}
if (mod_ptr >= mod_end)
mod_ptr = demod_ptr;
if (dur <= 0) {
if (fax_state == FATX_APTA)
fax_tx_phase(1);
else
fax_tx_stop(1);
}
}
/*
* transmit the phase-in signal for the image, which consists of 95% black
* and 5% white (or inverted if invphase is set). These 5% have to appear
* as one half to both the left and right margin of the image. The phase
* where we start is not important, but where we stop and give control
* to the function transmitting the contents of the loaded image.
* tx_phlines determines the number of lines for phasing, after which
* a line with 100% white is intersected to start the receiver.
* if init is set, variables are initialized and the function returns.
*/
void transmit_phase(int init)
{
static int inc_pix;
static int idx_pix;
static int idx_min, idx_max;
static int txlines;
if (init) {
inc_pix = lpm * (double) smplf / 60;
idx_min = 1638;
idx_max = 63807;
idx_pix = 0x8000;
txlines = tx_phlines + 1;
return;
}
while ((txlines >= 0) && (mod_ptr < mod_end)) {
idx_pix += inc_pix;
if (idx_pix > 63807 || idx_pix < 1638)
*mod_ptr = (invphase ? 0 : dmaxval);
else
*mod_ptr = (invphase ? dmaxval : 0);
mod_ptr++;
if (idx_pix > 0xffff)
txlines--;
idx_pix &= 0xffff;
}
if (mod_ptr >= mod_end)
mod_ptr = demod_ptr;
if (txlines <= 0)
fax_tx_start(1);
}
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