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/*
* SpanDSP - a series of DSP components for telephony
*
* t42.c - ITU T.42 JPEG for FAX image processing
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2011 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 <stdlib.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <memory.h>
#include <string.h>
#include <float.h>
#if defined(HAVE_TGMATH_H)
#include <tgmath.h>
#endif
#if defined(HAVE_MATH_H)
#include <math.h>
#endif
#if defined(HAVE_STDBOOL_H)
#include <stdbool.h>
#else
#include "spandsp/stdbool.h"
#endif
#include "floating_fudge.h"
#include <tiffio.h>
#include <assert.h>
#include "spandsp/telephony.h"
#include "spandsp/alloc.h"
#include "spandsp/fast_convert.h"
#include "spandsp/logging.h"
#include "spandsp/saturated.h"
#include "spandsp/async.h"
#include "spandsp/timezone.h"
#include "spandsp/t4_rx.h"
#include "spandsp/t4_tx.h"
#include "spandsp/t81_t82_arith_coding.h"
#include "spandsp/t85.h"
#include "spandsp/t42.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/t81_t82_arith_coding.h"
#include "spandsp/private/t85.h"
#include "spandsp/private/t42.h"
/* The open_memstream() and fmemopen() in older versions of glibc seem quirky */
#if defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 12))
#undef OPEN_MEMSTREAM
#endif
#define T42_USE_LUTS
#include "t42_t43_local.h"
#if defined(T42_USE_LUTS)
#include "cielab_luts.h"
#endif
typedef struct
{
float L;
float a;
float b;
} cielab_t;
typedef struct
{
uint8_t tag[5];
const char *name;
float xn;
float yn;
float zn;
} illuminant_t;
static const illuminant_t illuminants[] =
{
{"\0D50", "CIE D50/2°", 96.422f, 100.000f, 82.521f}, /* Horizon Light. ICC profile PCS */
{"", "CIE D50/10°", 96.720f, 100.000f, 81.427f},
{"", "CIE D55/2°", 95.682f, 100.000f, 92.149f}, /* Mid-morning/mid-afternoon daylight */
{"", "CIE D55/10°", 95.799f, 100.000f, 90.926f},
{"\0D65", "CIE D65/2°", 95.047f, 100.000f, 108.883f}, /* Noon daylight, television, sRGB color space */
{"", "CIE D65/10°", 94.811f, 100.000f, 107.304f},
{"\0D75", "CIE D75/2°", 94.972f, 100.000f, 122.638f}, /* North sky daylight */
{"", "CIE D75/10°", 94.416f, 100.000f, 120.641f},
{"\0\0F2", "F02/2°", 99.186f, 100.000f, 67.393f}, /* Cool white fluorescent */
{"", "F02/10°", 103.279f, 100.000f, 69.027f},
{"\0\0F7", "F07/2°", 95.041f, 100.000f, 108.747f}, /* D65 simulator, daylight simulator */
{"", "F07/10°", 95.792f, 100.000f, 107.686f},
{"\0F11", "F11/2°", 100.962f, 100.000f, 64.350f}, /* Philips TL84, Ultralume 40 */
{"", "F11/10°", 103.863f, 100.000f, 65.607f},
{"\0\0SA", "A/2°", 109.850f, 100.000f, 35.585f}, /* Incandescent/tungsten */
{"", "A/10°", 111.144f, 100.000f, 35.200f},
{"\0\0SC", "C/2°", 98.074f, 100.000f, 118.232f}, /* {obsolete} average/north sky daylight */
{"", "C/10°", 97.285f, 100.000f, 116.145f},
{"", "", 0.000f, 0.000f, 0.000f}
};
/* LERP(a,b,c) = linear interpolation macro, is 'a' when c == 0.0 and 'b' when c == 1.0 */
#define LERP(a,b,c) (((b) - (a))*(c) + (a))
typedef struct UVT
{
double u;
double v;
double t;
} UVT;
static const double rt[31] =
{
/* Reciprocal temperature (K) */
FLT_MIN,
10.0e-6,
20.0e-6,
30.0e-6,
40.0e-6,
50.0e-6,
60.0e-6,
70.0e-6,
80.0e-6,
90.0e-6,
100.0e-6,
125.0e-6,
150.0e-6,
175.0e-6,
200.0e-6,
225.0e-6,
250.0e-6,
275.0e-6,
300.0e-6,
325.0e-6,
350.0e-6,
375.0e-6,
400.0e-6,
425.0e-6,
450.0e-6,
475.0e-6,
500.0e-6,
525.0e-6,
550.0e-6,
575.0e-6,
600.0e-6
};
static const UVT uvt[31] =
{
{0.18006, 0.26352, -0.24341},
{0.18066, 0.26589, -0.25479},
{0.18133, 0.26846, -0.26876},
{0.18208, 0.27119, -0.28539},
{0.18293, 0.27407, -0.30470},
{0.18388, 0.27709, -0.32675},
{0.18494, 0.28021, -0.35156},
{0.18611, 0.28342, -0.37915},
{0.18740, 0.28668, -0.40955},
{0.18880, 0.28997, -0.44278},
{0.19032, 0.29326, -0.47888},
{0.19462, 0.30141, -0.58204},
{0.19962, 0.30921, -0.70471},
{0.20525, 0.31647, -0.84901},
{0.21142, 0.32312, -1.01820},
{0.21807, 0.32909, -1.21680},
{0.22511, 0.33439, -1.45120},
{0.23247, 0.33904, -1.72980},
{0.24010, 0.34308, -2.06370},
{0.24792, 0.34655, -2.46810}, /* Note: 0.24792 is a corrected value for the error found in W&S as 0.24702 */
{0.25591, 0.34951, -2.96410},
{0.26400, 0.35200, -3.58140},
{0.27218, 0.35407, -4.36330},
{0.28039, 0.35577, -5.37620},
{0.28863, 0.35714, -6.72620},
{0.29685, 0.35823, -8.59550},
{0.30505, 0.35907, -11.3240},
{0.31320, 0.35968, -15.6280},
{0.32129, 0.36011, -23.3250},
{0.32931, 0.36038, -40.7700},
{0.33724, 0.36051, -116.450}
};
static __inline__ uint16_t pack_16(const uint8_t *s)
{
uint16_t value;
value = ((uint16_t) s[0] << 8) | (uint16_t) s[1];
return value;
}
/*- End of function --------------------------------------------------------*/
#if 0
static __inline__ uint32_t pack_32(const uint8_t *s)
{
uint32_t value;
value = ((uint32_t) s[0] << 24) | ((uint32_t) s[1] << 16) | ((uint32_t) s[2] << 8) | (uint32_t) s[3];
return value;
}
/*- End of function --------------------------------------------------------*/
#endif
static __inline__ int unpack_16(uint8_t *s, uint16_t value)
{
s[0] = (value >> 8) & 0xFF;
s[1] = value & 0xFF;
return sizeof(uint16_t);
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(bool) t42_analyse_header(uint32_t *width, uint32_t *length, const uint8_t data[], size_t len)
{
int type;
int seg;
int pos;
/* Search the image data for its width and length */
*length = 0;
*width = 0;
pos = 0;
if (pack_16(&data[pos]) != 0xFFD8)
return false;
pos += 2;
while (pos < len)
{
type = pack_16(&data[pos]);
pos += 2;
seg = pack_16(&data[pos]) - 2;
pos += 2;
if (type == 0xFFC0)
{
*length = pack_16(&data[pos + 1]);
*width = pack_16(&data[pos + 3]);
return true;
}
pos += seg;
}
return false;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) xyz_to_corrected_color_temp(float *temp, float xyz[3])
{
float us;
float vs;
float p;
float di;
float dm;
int i;
/* Protect against possible divide-by-zero failure */
if ((xyz[0] < 1.0e-20f) && (xyz[1] < 1.0e-20f) && (xyz[2] < 1.0e-20f))
return -1;
us = (4.0f*xyz[0])/(xyz[0] + 15.0f*xyz[1] + 3.0f*xyz[2]);
vs = (6.0f*xyz[1])/(xyz[0] + 15.0f*xyz[1] + 3.0f*xyz[2]);
dm = 0.0f;
for (i = 0; i < 31; i++)
{
di = (vs - uvt[i].v) - uvt[i].t*(us - uvt[i].u);
if ((i > 0) && (((di < 0.0f) && (dm >= 0.0f)) || ((di >= 0.0f) && (dm < 0.0f))))
break; /* found lines bounding (us, vs) : i-1 and i */
dm = di;
}
if (i == 31)
{
/* Bad XYZ input, color temp would be less than minimum of 1666.7 degrees, or too far towards blue */
return -1;
}
di = di/sqrtf(1.0f + uvt[i ].t*uvt[i ].t);
dm = dm/sqrtf(1.0f + uvt[i - 1].t*uvt[i - 1].t);
p = dm/(dm - di); /* p = interpolation parameter, 0.0 : i-1, 1.0 : i */
p = 1.0f/(LERP(rt[i - 1], rt[i], p));
*temp = p;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) colour_temp_to_xyz(float xyz[3], float temp)
{
float x;
float y;
/* Should be good for 1667K to 25000K according to Wikipedia */
if (temp < 1667.0f || temp > 25000.0f)
return -1;
if (temp < 4000.0f)
x = -0.2661239e9f/(temp*temp*temp) - 0.2343580e6f/(temp*temp) + 0.8776956e3f/temp + 0.179910f;
else
x = -3.0258469e9f/(temp*temp*temp) + 2.1070379e6f/(temp*temp) + 0.2226347e3f/temp + 0.240390f;
if (temp < 2222.0f)
y = -1.1063814f*x*x*x - 1.34811020f*x*x + 2.18555832f*x - 0.20219683f;
else if (temp < 4000.0f)
y = -0.9549476f*x*x*x - 1.37418593f*x*x + 2.09137015f*x - 0.16748867f;
else
y = 3.0817580f*x*x*x - 5.87338670f*x*x + 3.75112997f*x - 0.37001483f;
xyz[0] = x/y;
xyz[1] = 1.0f;
xyz[2] = (1.0f - x - y)/y;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) set_lab_illuminant(lab_params_t *lab, float new_xn, float new_yn, float new_zn)
{
if (new_yn > 10.0f)
{
lab->x_n = new_xn/100.0f;
lab->y_n = new_yn/100.0f;
lab->z_n = new_zn/100.0f;
}
else
{
lab->x_n = new_xn;
lab->y_n = new_yn;
lab->z_n = new_zn;
}
lab->x_rn = 1.0f/lab->x_n;
lab->y_rn = 1.0f/lab->y_n;
lab->z_rn = 1.0f/lab->z_n;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) set_lab_gamut(lab_params_t *lab, int L_min, int L_max, int a_min, int a_max, int b_min, int b_max, int ab_are_signed)
{
lab->range_L = L_max - L_min;
lab->range_a = a_max - a_min;
lab->range_b = b_max - b_min;
lab->offset_L = -256.0f*L_min/lab->range_L;
lab->offset_a = -256.0f*a_min/lab->range_a;
lab->offset_b = -256.0f*b_min/lab->range_b;
lab->range_L /= (256.0f - 1.0f);
lab->range_a /= (256.0f - 1.0f);
lab->range_b /= (256.0f - 1.0f);
lab->ab_are_signed = ab_are_signed;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) set_lab_gamut2(lab_params_t *lab, int L_P, int L_Q, int a_P, int a_Q, int b_P, int b_Q)
{
lab->range_L = L_Q/(256.0f - 1.0f);
lab->range_a = a_Q/(256.0f - 1.0f);
lab->range_b = b_Q/(256.0f - 1.0f);
lab->offset_L = L_P;
lab->offset_a = a_P;
lab->offset_b = b_P;
lab->ab_are_signed = false;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) get_lab_gamut2(lab_params_t *lab, int *L_P, int *L_Q, int *a_P, int *a_Q, int *b_P, int *b_Q)
{
*L_Q = lab->range_L*(256.0f - 1.0f);
*a_Q = lab->range_a*(256.0f - 1.0f);
*b_Q = lab->range_b*(256.0f - 1.0f);
*L_P = lab->offset_L;
*a_P = lab->offset_a;
*b_P = lab->offset_b;
}
/*- End of function --------------------------------------------------------*/
int set_illuminant_from_code(logging_state_t *logging, lab_params_t *lab, const uint8_t code[4])
{
int i;
int colour_temp;
float xyz[3] = { 0 };
if (memcmp(code, "CT", 2) == 0)
{
colour_temp = pack_16(&code[2]);
span_log(logging, SPAN_LOG_FLOW, "Illuminant colour temp %dK\n", colour_temp);
colour_temp_to_xyz(xyz, (float) colour_temp);
set_lab_illuminant(lab, xyz[0], xyz[1], xyz[2]);
return colour_temp;
}
for (i = 0; illuminants[i].name[0]; i++)
{
if (memcmp(code, illuminants[i].tag, 4) == 0)
{
span_log(logging, SPAN_LOG_FLOW, "Illuminant %s\n", illuminants[i].name);
set_lab_illuminant(lab, illuminants[i].xn, illuminants[i].yn, illuminants[i].zn);
return 0;
}
}
if (illuminants[i].name[0] == '\0')
span_log(logging, SPAN_LOG_FLOW, "Unrecognised illuminant 0x%x 0x%x 0x%x 0x%x\n", code[0], code[1], code[2], code[3]);
return -1;
}
/*- End of function --------------------------------------------------------*/
void set_gamut_from_code(logging_state_t *logging, lab_params_t *s, const uint8_t code[12])
{
int i;
int val[6];
for (i = 0; i < 6; i++)
val[i] = pack_16(&code[2*i]);
span_log(logging,
SPAN_LOG_FLOW,
"Gamut L=[%d,%d], a*=[%d,%d], b*=[%d,%d]\n",
val[0],
val[1],
val[2],
val[3],
val[4],
val[5]);
set_lab_gamut2(s, val[0], val[1], val[2], val[3], val[4], val[5]);
}
/*- End of function --------------------------------------------------------*/
static __inline__ void itu_to_lab(lab_params_t *s, cielab_t *lab, const uint8_t in[3])
{
uint8_t a;
uint8_t b;
/* T.4 E.6.4 */
lab->L = s->range_L*(in[0] - s->offset_L);
a = in[1];
b = in[2];
if (s->ab_are_signed)
{
a += 128;
b += 128;
}
lab->a = s->range_a*(a - s->offset_a);
lab->b = s->range_b*(b - s->offset_b);
}
/*- End of function --------------------------------------------------------*/
static __inline__ void lab_to_itu(lab_params_t *s, uint8_t out[3], const cielab_t *lab)
{
/* T.4 E.6.4 */
out[0] = saturateu8(floorf(lab->L/s->range_L + s->offset_L));
out[1] = saturateu8(floorf(lab->a/s->range_a + s->offset_a));
out[2] = saturateu8(floorf(lab->b/s->range_b + s->offset_b));
if (s->ab_are_signed)
{
out[1] -= 128;
out[2] -= 128;
}
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) srgb_to_lab(lab_params_t *s, uint8_t lab[], const uint8_t srgb[], int pixels)
{
float x;
float y;
float z;
float r;
float g;
float b;
float xx;
float yy;
float zz;
cielab_t l;
int i;
for (i = 0; i < 3*pixels; i += 3)
{
#if defined(T42_USE_LUTS)
r = srgb_to_linear[srgb[i]];
g = srgb_to_linear[srgb[i + 1]];
b = srgb_to_linear[srgb[i + 2]];
#else
r = srgb[i]/256.0f;
g = srgb[i + 1]/256.0f;
b = srgb[i + 2]/256.0f;
/* sRGB to linear RGB */
r = (r > 0.04045f) ? powf((r + 0.055f)/1.055f, 2.4f) : r/12.92f;
g = (g > 0.04045f) ? powf((g + 0.055f)/1.055f, 2.4f) : g/12.92f;
b = (b > 0.04045f) ? powf((b + 0.055f)/1.055f, 2.4f) : b/12.92f;
#endif
/* Linear RGB to XYZ */
x = 0.4124f*r + 0.3576f*g + 0.1805f*b;
y = 0.2126f*r + 0.7152f*g + 0.0722f*b;
z = 0.0193f*r + 0.1192f*g + 0.9505f*b;
/* Normalise for the illuminant */
x *= s->x_rn;
y *= s->y_rn;
z *= s->z_rn;
/* XYZ to Lab */
xx = (x <= 0.008856f) ? (7.787f*x + 0.1379f) : cbrtf(x);
yy = (y <= 0.008856f) ? (7.787f*y + 0.1379f) : cbrtf(y);
zz = (z <= 0.008856f) ? (7.787f*z + 0.1379f) : cbrtf(z);
l.L = 116.0f*yy - 16.0f;
l.a = 500.0f*(xx - yy);
l.b = 200.0f*(yy - zz);
lab_to_itu(s, lab, &l);
lab += 3;
}
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) lab_to_srgb(lab_params_t *s, uint8_t srgb[], const uint8_t lab[], int pixels)
{
float x;
float y;
float z;
float r;
float g;
float b;
float ll;
cielab_t l;
int val;
int i;
for (i = 0; i < 3*pixels; i += 3)
{
itu_to_lab(s, &l, lab);
/* Lab to XYZ */
ll = (1.0f/116.0f)*(l.L + 16.0f);
y = ll;
y = (y <= 0.2068f) ? (0.1284f*(y - 0.1379f)) : y*y*y;
x = ll + (1.0f/500.0f)*l.a;
x = (x <= 0.2068f) ? (0.1284f*(x - 0.1379f)) : x*x*x;
z = ll - (1.0f/200.0f)*l.b;
z = (z <= 0.2068f) ? (0.1284f*(z - 0.1379f)) : z*z*z;
/* Normalise for the illuminant */
x *= s->x_n;
y *= s->y_n;
z *= s->z_n;
/* XYZ to linear RGB */
r = 3.2406f*x - 1.5372f*y - 0.4986f*z;
g = -0.9689f*x + 1.8758f*y + 0.0415f*z;
b = 0.0557f*x - 0.2040f*y + 1.0570f*z;
#if defined(T42_USE_LUTS)
val = r*4096.0f;
srgb[i] = linear_to_srgb[(val < 0) ? 0 : (val < 4095) ? val : 4095];
val = g*4096.0f;
srgb[i + 1] = linear_to_srgb[(val < 0) ? 0 : (val < 4095) ? val : 4095];
val = b*4096.0f;
srgb[i + 2] = linear_to_srgb[(val < 0) ? 0 : (val < 4095) ? val : 4095];
#else
/* Linear RGB to sRGB */
r = (r > 0.0031308f) ? (1.055f*powf(r, 1.0f/2.4f) - 0.055f) : r*12.92f;
g = (g > 0.0031308f) ? (1.055f*powf(g, 1.0f/2.4f) - 0.055f) : g*12.92f;
b = (b > 0.0031308f) ? (1.055f*powf(b, 1.0f/2.4f) - 0.055f) : b*12.92f;
srgb[i] = saturateu8(floorf(r*256.0f));
srgb[i + 1] = saturateu8(floorf(g*256.0f));
srgb[i + 2] = saturateu8(floorf(b*256.0f));
#endif
lab += 3;
}
}
/*- End of function --------------------------------------------------------*/
static int is_itu_fax(t42_decode_state_t *s, jpeg_saved_marker_ptr ptr)
{
const uint8_t *data;
int ok;
int val[6];
ok = false;
for ( ; ptr; ptr = ptr->next)
{
if (ptr->marker != (JPEG_APP0 + 1))
continue;
if (ptr->data_length < 6)
return false;
/* Markers are:
JPEG_RST0
JPEG_EOI
JPEG_APP0
JPEG_COM */
data = (const uint8_t *) ptr->data;
if (strncmp((const char *) data, "G3FAX", 5))
return false;
switch (data[5])
{
case 0:
if (ptr->data_length < 6 + 4)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Got bad G3FAX0 length - %d\n", ptr->data_length);
return false;
}
val[0] = pack_16(&data[6]);
s->spatial_resolution = pack_16(&data[6 + 2]);
span_log(&s->logging, SPAN_LOG_FLOW, "Version %d, resolution %ddpi\n", val[0], s->spatial_resolution);
ok = true;
break;
case 1:
span_log(&s->logging, SPAN_LOG_FLOW, "Set gamut\n");
if (ptr->data_length < 6 + 12)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Got bad G3FAX1 length - %d\n", ptr->data_length);
return false;
}
set_gamut_from_code(&s->logging, &s->lab, &data[6]);
break;
case 2:
span_log(&s->logging, SPAN_LOG_FLOW, "Set illuminant\n");
if (ptr->data_length < 6 + 4)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Got bad G3FAX2 length - %d\n", ptr->data_length);
return false;
}
s->illuminant_colour_temperature = set_illuminant_from_code(&s->logging, &s->lab, &data[6]);
break;
default:
span_log(&s->logging, SPAN_LOG_FLOW, "Got unexpected G3FAX%d length - %d\n", data[5], ptr->data_length);
return false;
}
}
return ok;
}
/*- End of function --------------------------------------------------------*/
static void set_itu_fax(t42_encode_state_t *s)
{
uint8_t data[50];
int val[6];
memcpy(data, "G3FAX\0", 6);
unpack_16(&data[6 + 0], 1994);
unpack_16(&data[6 + 2], s->spatial_resolution);
jpeg_write_marker(&s->compressor, (JPEG_APP0 + 1), data, 6 + 4);
if (s->lab.offset_L != 0
||
s->lab.range_L != 100
||
s->lab.offset_a != 128
||
s->lab.range_a != 170
||
s->lab.offset_b != 96
||
s->lab.range_b != 200)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Putting G3FAX1\n");
memcpy(data, "G3FAX\1", 6);
get_lab_gamut2(&s->lab, &val[0], &val[1], &val[2], &val[3], &val[4], &val[5]);
unpack_16(&data[6 + 0], val[0]);
unpack_16(&data[6 + 2], val[1]);
unpack_16(&data[6 + 4], val[2]);
unpack_16(&data[6 + 6], val[3]);
unpack_16(&data[6 + 8], val[4]);
unpack_16(&data[6 + 10], val[5]);
jpeg_write_marker(&s->compressor, (JPEG_APP0 + 1), data, 6 + 12);
}
if (memcmp(s->illuminant_code, "\0\0\0\0", 4) != 0
||
s->illuminant_colour_temperature > 0)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Putting G3FAX2\n");
memcpy(data, "G3FAX\2", 6);
if (memcmp(s->illuminant_code, "\0\0\0\0", 4) != 0)
{
memcpy(&data[6], s->illuminant_code, 4);
}
else
{
memcpy(&data[6 + 0], "CT", 2);
unpack_16(&data[6 + 2], s->illuminant_colour_temperature);
}
jpeg_write_marker(&s->compressor, (JPEG_APP0 + 1), data, 6 + 4);
}
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) t42_encode_set_options(t42_encode_state_t *s,
uint32_t l0,
int quality,
int options)
{
s->quality = quality;
s->no_subsampling = (options & 1);
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_set_image_width(t42_encode_state_t *s, uint32_t image_width)
{
s->image_width = image_width;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_set_image_length(t42_encode_state_t *s, uint32_t image_length)
{
s->image_length = image_length;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_set_image_type(t42_encode_state_t *s, int image_type)
{
s->image_type = image_type;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) t42_encode_abort(t42_encode_state_t *s)
{
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) t42_encode_comment(t42_encode_state_t *s, const uint8_t comment[], size_t len)
{
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_image_complete(t42_encode_state_t *s)
{
//if (????)
// return SIG_STATUS_END_OF_DATA;
return 0;
}
/*- End of function --------------------------------------------------------*/
/* Error handler for IJG library */
static void jpg_encode_error_exit(j_common_ptr cinfo)
{
t42_encode_state_t *s;
s = (t42_encode_state_t *) cinfo->client_data;
(*cinfo->err->format_message)(cinfo, s->error_message);
longjmp(s->escape, 1);
}
/*- End of function --------------------------------------------------------*/
/* This is the error catcher */
static struct jpeg_error_mgr encode_error_handler =
{
#if defined(_MSC_VER) || defined(__sunos) || defined(__solaris) || defined(__sun)
jpg_encode_error_exit,
0,
jpg_encode_error_exit
#else
.error_exit = jpg_encode_error_exit,
.output_message = jpg_encode_error_exit
#endif
};
static int t42_srgb_to_itulab_jpeg(t42_encode_state_t *s)
{
int i;
if (setjmp(s->escape))
{
if (s->error_message[0])
span_log(&s->logging, SPAN_LOG_FLOW, "%s\n", s->error_message);
else
span_log(&s->logging, SPAN_LOG_FLOW, "Unspecified libjpeg error.\n");
if (s->scan_line_out)
{
span_free(s->scan_line_out);
s->scan_line_out = NULL;
}
if (s->out)
{
fclose(s->out);
s->out = NULL;
}
return -1;
}
s->compressor.err = jpeg_std_error(&encode_error_handler);
s->compressor.client_data = (void *) s;
jpeg_create_compress(&s->compressor);
jpeg_stdio_dest(&s->compressor, s->out);
/* Force the destination colour space */
if (s->image_type == T4_IMAGE_TYPE_COLOUR_8BIT)
{
s->samples_per_pixel = 3;
s->compressor.in_color_space = JCS_YCbCr;
s->compressor.input_components = s->samples_per_pixel;
}
else
{
s->samples_per_pixel = 1;
s->compressor.in_color_space = JCS_GRAYSCALE;
s->compressor.input_components = s->samples_per_pixel;
}
jpeg_set_defaults(&s->compressor);
/* Limit to baseline-JPEG values */
//jpeg_set_quality(&s->compressor, s->quality, true);
if (s->no_subsampling)
{
/* Set 1:1:1 */
s->compressor.comp_info[0].h_samp_factor = 1;
s->compressor.comp_info[0].v_samp_factor = 1;
}
else
{
/* Set 4:1:1 */
s->compressor.comp_info[0].h_samp_factor = 2;
s->compressor.comp_info[0].v_samp_factor = 2;
}
s->compressor.comp_info[1].h_samp_factor = 1;
s->compressor.comp_info[1].v_samp_factor = 1;
s->compressor.comp_info[2].h_samp_factor = 1;
s->compressor.comp_info[2].v_samp_factor = 1;
/* Size, resolution, etc */
s->compressor.image_width = s->image_width;
s->compressor.image_height = s->image_length;
jpeg_start_compress(&s->compressor, true);
set_itu_fax(s);
if ((s->scan_line_in = (JSAMPROW) span_alloc(s->samples_per_pixel*s->image_width)) == NULL)
return -1;
if (s->image_type == T4_IMAGE_TYPE_COLOUR_8BIT)
{
if ((s->scan_line_out = (JSAMPROW) span_alloc(s->samples_per_pixel*s->image_width)) == NULL)
return -1;
for (i = 0; i < s->compressor.image_height; i++)
{
s->row_read_handler(s->row_read_user_data, s->scan_line_in, s->samples_per_pixel*s->image_width);
srgb_to_lab(&s->lab, s->scan_line_out, s->scan_line_in, s->image_width);
jpeg_write_scanlines(&s->compressor, &s->scan_line_out, 1);
}
}
else
{
for (i = 0; i < s->compressor.image_height; i++)
{
s->row_read_handler(s->row_read_user_data, s->scan_line_in, s->image_width);
jpeg_write_scanlines(&s->compressor, &s->scan_line_in, 1);
}
}
if (s->scan_line_out)
{
span_free(s->scan_line_out);
s->scan_line_out = NULL;
}
jpeg_finish_compress(&s->compressor);
jpeg_destroy_compress(&s->compressor);
#if defined(HAVE_OPEN_MEMSTREAM)
fclose(s->out);
s->buf_size =
s->compressed_image_size = s->outsize;
#else
s->buf_size =
s->compressed_image_size = ftell(s->out);
if ((s->compressed_buf = span_alloc(s->compressed_image_size)) == NULL)
return -1;
if (fseek(s->out, 0, SEEK_SET) != 0)
{
fclose(s->out);
s->out = NULL;
span_free(s->compressed_buf);
s->compressed_buf = NULL;
return -1;
}
if (fread(s->compressed_buf, 1, s->compressed_image_size, s->out) != s->compressed_image_size)
{
fclose(s->out);
s->out = NULL;
span_free(s->compressed_buf);
s->compressed_buf = NULL;
return -1;
}
if (s->out)
{
fclose(s->out);
s->out = NULL;
}
#endif
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_get(t42_encode_state_t *s, uint8_t buf[], size_t max_len)
{
int len;
if (s->compressed_image_size == 0)
{
if (t42_srgb_to_itulab_jpeg(s))
{
span_log(&s->logging, SPAN_LOG_FLOW, "Failed to convert to ITULAB.\n");
return -1;
}
}
if (s->compressed_image_size >= s->compressed_image_ptr + max_len)
len = max_len;
else
len = s->compressed_image_size - s->compressed_image_ptr;
memcpy(buf, &s->compressed_buf[s->compressed_image_ptr], len);
s->compressed_image_ptr += len;
return len;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(uint32_t) t42_encode_get_image_width(t42_encode_state_t *s)
{
return s->image_width;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(uint32_t) t42_encode_get_image_length(t42_encode_state_t *s)
{
return s->image_length;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_get_compressed_image_size(t42_encode_state_t *s)
{
return s->compressed_image_size;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_set_row_read_handler(t42_encode_state_t *s,
t4_row_read_handler_t handler,
void *user_data)
{
s->row_read_handler = handler;
s->row_read_user_data = user_data;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(logging_state_t *) t42_encode_get_logging_state(t42_encode_state_t *s)
{
return &s->logging;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_restart(t42_encode_state_t *s, uint32_t image_width, uint32_t image_length)
{
s->image_width = image_width;
s->image_length = image_length;
if (s->itu_ycc)
{
/* ITU-YCC */
/* Illuminant D65 */
//set_lab_illuminant(&s->lab, 95.047f, 100.000f, 108.883f);
set_lab_illuminant(&s->lab, 100.0f, 100.0f, 100.0f);
set_lab_gamut(&s->lab, 0, 100, -127, 127, -127, 127, false);
}
else
{
/* ITULAB */
/* Illuminant D50 */
//set_lab_illuminant(&s->lab, 96.422f, 100.000f, 82.521f);
set_lab_illuminant(&s->lab, 100.0f, 100.0f, 100.0f);
set_lab_gamut(&s->lab, 0, 100, -85, 85, -75, 125, false);
}
s->compressed_image_size = 0;
s->compressed_image_ptr = 0;
s->spatial_resolution = 200;
s->error_message[0] = '\0';
#if defined(HAVE_OPEN_MEMSTREAM)
s->outsize = 0;
if ((s->out = open_memstream((char **) &s->compressed_buf, &s->outsize)) == NULL)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Failed to open_memstream().\n");
return -1;
}
#else
if ((s->out = tmpfile()) == NULL)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Failed to tmpfile().\n");
return -1;
}
#endif
s->scan_line_out = NULL;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(t42_encode_state_t *) t42_encode_init(t42_encode_state_t *s,
uint32_t image_width,
uint32_t image_length,
t4_row_read_handler_t handler,
void *user_data)
{
if (s == NULL)
{
if ((s = (t42_encode_state_t *) span_alloc(sizeof(*s))) == NULL)
return NULL;
}
memset(s, 0, sizeof(*s));
span_log_init(&s->logging, SPAN_LOG_NONE, NULL);
span_log_set_protocol(&s->logging, "T.42");
s->quality = 90;
s->image_type = T4_IMAGE_TYPE_COLOUR_8BIT;
s->row_read_handler = handler;
s->row_read_user_data = user_data;
t42_encode_restart(s, image_width, image_length);
return s;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_release(t42_encode_state_t *s)
{
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_encode_free(t42_encode_state_t *s)
{
int ret;
ret = t42_encode_release(s);
span_free(s);
return ret;
}
/*- End of function --------------------------------------------------------*/
/* Error handler for IJG library */
static void jpg_decode_error_exit(j_common_ptr cinfo)
{
t42_decode_state_t *s;
s = (t42_decode_state_t *) cinfo->client_data;
(*cinfo->err->format_message)(cinfo, s->error_message);
longjmp(s->escape, 1);
}
/*- End of function --------------------------------------------------------*/
/* This is the error catcher */
static struct jpeg_error_mgr decode_error_handler =
{
#if defined(_MSC_VER) || defined(__sunos) || defined(__solaris) || defined(__sun)
jpg_decode_error_exit,
0,
jpg_decode_error_exit
#else
.error_exit = jpg_decode_error_exit,
.output_message = jpg_decode_error_exit
#endif
};
static int t42_itulab_jpeg_to_srgb(t42_decode_state_t *s)
{
int i;
if (s->compressed_buf == NULL)
return -1;
#if defined(HAVE_OPEN_MEMSTREAM)
if ((s->in = fmemopen(s->compressed_buf, s->compressed_image_size, "r")) == NULL)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Failed to fmemopen().\n");
return -1;
}
#else
if ((s->in = tmpfile()) == NULL)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Failed to tmpfile().\n");
return -1;
}
if (fwrite(s->compressed_buf, 1, s->compressed_image_size, s->in) != s->compressed_image_size)
{
fclose(s->in);
s->in = NULL;
return -1;
}
if (fseek(s->in, 0, SEEK_SET) != 0)
{
fclose(s->in);
s->in = NULL;
return -1;
}
#endif
s->scan_line_out = NULL;
if (setjmp(s->escape))
{
if (s->error_message[0])
span_log(&s->logging, SPAN_LOG_FLOW, "%s\n", s->error_message);
else
span_log(&s->logging, SPAN_LOG_FLOW, "Unspecified libjpeg error.\n");
if (s->scan_line_out)
{
span_free(s->scan_line_out);
s->scan_line_out = NULL;
}
if (s->in)
{
fclose(s->in);
s->in = NULL;
}
return -1;
}
/* Create input decompressor. */
s->decompressor.err = jpeg_std_error(&decode_error_handler);
s->decompressor.client_data = (void *) s;
jpeg_create_decompress(&s->decompressor);
jpeg_stdio_src(&s->decompressor, s->in);
/* Get the FAX tags */
for (i = 0; i < 16; i++)
jpeg_save_markers(&s->decompressor, JPEG_APP0 + i, 0xFFFF);
/* Take the header */
jpeg_read_header(&s->decompressor, false);
/* Sanity check and parameter check */
if (!is_itu_fax(s, s->decompressor.marker_list))
{
span_log(&s->logging, SPAN_LOG_FLOW, "Is not an ITU FAX.\n");
return -1;
}
/* Copy size, resolution, etc */
s->image_width = s->decompressor.image_width;
s->image_length = s->decompressor.image_height;
s->samples_per_pixel = s->decompressor.num_components;
if (s->samples_per_pixel == 3)
{
/* Now we can force the input colour space. For ITULab, we use YCbCr as a "don't touch" marker */
s->decompressor.out_color_space = JCS_YCbCr;
span_log(&s->logging,
SPAN_LOG_FLOW,
"Sampling %d %d %d %d %d %d\n",
s->decompressor.comp_info[0].h_samp_factor,
s->decompressor.comp_info[0].v_samp_factor,
s->decompressor.comp_info[1].h_samp_factor,
s->decompressor.comp_info[1].v_samp_factor,
s->decompressor.comp_info[2].h_samp_factor,
s->decompressor.comp_info[2].v_samp_factor);
}
else
{
s->decompressor.out_color_space = JCS_GRAYSCALE;
span_log(&s->logging,
SPAN_LOG_FLOW,
"Sampling %d %d\n",
s->decompressor.comp_info[0].h_samp_factor,
s->decompressor.comp_info[0].v_samp_factor);
}
jpeg_start_decompress(&s->decompressor);
if ((s->scan_line_in = span_alloc(s->samples_per_pixel*s->image_width)) == NULL)
return -1;
if (s->samples_per_pixel == 3)
{
if ((s->scan_line_out = span_alloc(s->samples_per_pixel*s->image_width)) == NULL)
return -1;
while (s->decompressor.output_scanline < s->image_length)
{
jpeg_read_scanlines(&s->decompressor, &s->scan_line_in, 1);
lab_to_srgb(&s->lab, s->scan_line_out, s->scan_line_in, s->image_width);
s->row_write_handler(s->row_write_user_data, s->scan_line_out, s->samples_per_pixel*s->image_width);
}
}
else
{
while (s->decompressor.output_scanline < s->image_length)
{
jpeg_read_scanlines(&s->decompressor, &s->scan_line_in, 1);
s->row_write_handler(s->row_write_user_data, s->scan_line_in, s->image_width);
}
}
if (s->scan_line_in)
{
span_free(s->scan_line_in);
s->scan_line_in = NULL;
}
if (s->scan_line_out)
{
span_free(s->scan_line_out);
s->scan_line_out = NULL;
}
jpeg_finish_decompress(&s->decompressor);
jpeg_destroy_decompress(&s->decompressor);
fclose(s->in);
s->in = NULL;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) t42_decode_rx_status(t42_decode_state_t *s, int status)
{
span_log(&s->logging, SPAN_LOG_FLOW, "Signal status is %s (%d)\n", signal_status_to_str(status), status);
switch (status)
{
case SIG_STATUS_TRAINING_IN_PROGRESS:
case SIG_STATUS_TRAINING_FAILED:
case SIG_STATUS_TRAINING_SUCCEEDED:
case SIG_STATUS_CARRIER_UP:
/* Ignore these */
break;
case SIG_STATUS_CARRIER_DOWN:
case SIG_STATUS_END_OF_DATA:
/* Finalise the image */
if (!s->end_of_data)
{
if (t42_itulab_jpeg_to_srgb(s))
span_log(&s->logging, SPAN_LOG_FLOW, "Failed to convert from ITULAB.\n");
s->end_of_data = true;
}
break;
default:
span_log(&s->logging, SPAN_LOG_WARNING, "Unexpected rx status - %d!\n", status);
break;
}
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_decode_put(t42_decode_state_t *s, const uint8_t data[], size_t len)
{
uint8_t *buf;
if (len == 0)
{
if (!s->end_of_data)
{
if (t42_itulab_jpeg_to_srgb(s))
span_log(&s->logging, SPAN_LOG_FLOW, "Failed to convert from ITULAB.\n");
s->end_of_data = true;
}
return T4_DECODE_OK;
}
if (s->compressed_image_size + len > s->buf_size)
{
if ((buf = (uint8_t *) span_realloc(s->compressed_buf, s->compressed_image_size + len + 10000)) == NULL)
return -1;
s->buf_size = s->compressed_image_size + len + 10000;
s->compressed_buf = buf;
}
memcpy(&s->compressed_buf[s->compressed_image_size], data, len);
s->compressed_image_size += len;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_decode_set_row_write_handler(t42_decode_state_t *s,
t4_row_write_handler_t handler,
void *user_data)
{
s->row_write_handler = handler;
s->row_write_user_data = user_data;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_decode_set_comment_handler(t42_decode_state_t *s,
uint32_t max_comment_len,
t4_row_write_handler_t handler,
void *user_data)
{
s->max_comment_len = max_comment_len;
s->comment_handler = handler;
s->comment_user_data = user_data;
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_decode_set_image_size_constraints(t42_decode_state_t *s,
uint32_t max_xd,
uint32_t max_yd)
{
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(uint32_t) t42_decode_get_image_width(t42_decode_state_t *s)
{
return s->image_width;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(uint32_t) t42_decode_get_image_length(t42_decode_state_t *s)
{
return s->image_length;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_decode_get_compressed_image_size(t42_decode_state_t *s)
{
return s->compressed_image_size;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(logging_state_t *) t42_decode_get_logging_state(t42_decode_state_t *s)
{
return &s->logging;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_decode_restart(t42_decode_state_t *s)
{
if (s->itu_ycc)
{
/* ITU-YCC */
/* Illuminant D65 */
//set_lab_illuminant(&s->lab, 95.047f, 100.000f, 108.883f);
set_lab_illuminant(&s->lab, 100.0f, 100.0f, 100.0f);
set_lab_gamut(&s->lab, 0, 100, -127, 127, -127, 127, false);
}
else
{
/* ITULAB */
/* Illuminant D50 */
//set_lab_illuminant(&s->lab, 96.422f, 100.000f, 82.521f);
set_lab_illuminant(&s->lab, 100.0f, 100.0f, 100.0f);
set_lab_gamut(&s->lab, 0, 100, -85, 85, -75, 125, false);
}
s->end_of_data = false;
s->compressed_image_size = 0;
s->error_message[0] = '\0';
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(t42_decode_state_t *) t42_decode_init(t42_decode_state_t *s,
t4_row_write_handler_t handler,
void *user_data)
{
if (s == NULL)
{
if ((s = (t42_decode_state_t *) span_alloc(sizeof(*s))) == NULL)
return NULL;
}
memset(s, 0, sizeof(*s));
span_log_init(&s->logging, SPAN_LOG_NONE, NULL);
span_log_set_protocol(&s->logging, "T.42");
s->row_write_handler = handler;
s->row_write_user_data = user_data;
s->buf_size = 0;
s->compressed_buf = NULL;
t42_decode_restart(s);
return s;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_decode_release(t42_decode_state_t *s)
{
if (s->scan_line_in)
{
span_free(s->scan_line_in);
s->scan_line_in = NULL;
}
if (s->scan_line_out)
{
span_free(s->scan_line_out);
s->scan_line_out = NULL;
}
jpeg_destroy_decompress(&s->decompressor);
if (s->in)
{
fclose(s->in);
s->in = NULL;
}
if (s->comment)
{
span_free(s->comment);
s->comment = NULL;
}
return 0;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int) t42_decode_free(t42_decode_state_t *s)
{
int ret;
ret = t42_decode_release(s);
span_free(s);
return ret;
}
/*- End of function --------------------------------------------------------*/
/*- End of file ------------------------------------------------------------*/