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edid-decode.c
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edid-decode.c
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/*
* Copyright 2006-2009 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* Author: Adam Jackson <ajax@nwnk.net> */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
static int claims_one_point_oh = 0;
static int claims_one_point_two = 0;
static int claims_one_point_three = 0;
static int claims_one_point_four = 0;
static int nonconformant_digital_display = 0;
static int nonconformant_extension = 0;
static int did_detailed_timing = 0;
static int has_name_descriptor = 0;
static int name_descriptor_terminated = 0;
static int has_range_descriptor = 0;
static int has_preferred_timing = 0;
static int has_valid_checksum = 1;
static int has_valid_cvt = 1;
static int has_valid_dummy_block = 1;
static int has_valid_week = 0;
static int has_valid_year = 0;
static int has_valid_detailed_blocks = 0;
static int has_valid_extension_count = 0;
static int has_valid_descriptor_ordering = 1;
static int has_valid_descriptor_pad = 1;
static int has_valid_range_descriptor = 1;
static int has_valid_max_dotclock = 1;
static int manufacturer_name_well_formed = 0;
static int seen_non_detailed_descriptor = 0;
static int warning_excessive_dotclock_correction = 0;
static int warning_zero_preferred_refresh = 0;
static int conformant = 1;
static char *manufacturer_name(unsigned char *x)
{
static char name[4];
name[0] = ((x[0] & 0x7C) >> 2) + '@';
name[1] = ((x[0] & 0x03) << 3) + ((x[1] & 0xE0) >> 5) + '@';
name[2] = (x[1] & 0x1F) + '@';
name[3] = 0;
if (isupper(name[0]) && isupper(name[1]) && isupper(name[2]))
manufacturer_name_well_formed = 1;
return name;
}
static int
detailed_cvt_descriptor(unsigned char *x, int first)
{
const unsigned char empty[3] = { 0, 0, 0 };
char *names[] = { "50", "60", "75", "85" };
int width, height;
int valid = 1;
int fifty = 0, sixty = 0, seventyfive = 0, eightyfive = 0, reduced = 0;
if (!first && !memcmp(x, empty, 3))
return valid;
height = x[0];
height |= (x[1] & 0xf0) << 4;
height++;
height *= 2;
switch (x[1] & 0x0c) {
case 0x00:
width = (height * 4) / 3; break;
case 0x04:
width = (height * 16) / 9; break;
case 0x08:
width = (height * 16) / 10; break;
case 0x0c:
width = (height * 15) / 9; break;
}
if (x[1] & 0x03)
valid = 0;
if (x[2] & 0x80)
valid = 0;
if (!(x[2] & 0x1f))
valid = 0;
fifty = (x[2] & 0x10);
sixty = (x[2] & 0x08);
seventyfive = (x[2] & 0x04);
eightyfive = (x[2] & 0x02);
reduced = (x[2] & 0x01);
if (!valid) {
printf(" (broken)\n");
} else {
printf(" %dx%d @ ( %s%s%s%s%s) Hz (%s%s preferred)\n", width, height,
fifty ? "50 " : "",
sixty ? "60 " : "",
seventyfive ? "75 " : "",
eightyfive ? "85 " : "",
reduced ? "60RB " : "",
names[(x[2] & 0x60) >> 5],
(((x[2] & 0x60) == 0x20) && reduced) ? "RB" : "");
}
return valid;
}
/* 1 means valid data */
static int
detailed_block(unsigned char *x, int in_extension)
{
static unsigned char name[53];
int ha, hbl, hso, hspw, hborder, va, vbl, vso, vspw, vborder;
int i;
char phsync, pvsync, *syncmethod;
#if 0
printf("Hex of detail: ");
for (i = 0; i < 18; i++)
printf("%02x", x[i]);
printf("\n");
#endif
if (x[0] == 0 && x[1] == 0) {
/* Monitor descriptor block, not detailed timing descriptor. */
if (x[2] != 0) {
/* 1.3, 3.10.3 */
printf("Monitor descriptor block has byte 2 nonzero (0x%02x)\n",
x[2]);
has_valid_descriptor_pad = 0;
}
if (x[3] != 0xfd && x[4] != 0x00) {
/* 1.3, 3.10.3 */
printf("Monitor descriptor block has byte 4 nonzero (0x%02x)\n",
x[4]);
has_valid_descriptor_pad = 0;
}
seen_non_detailed_descriptor = 1;
if (x[3] <= 0xF) {
/*
* in principle we can decode these, if we know what they are.
* 0x0f seems to be common in laptop panels.
* 0x0e is used by EPI: http://www.epi-standard.org/
*/
printf("Manufacturer-specified data, tag %d\n", x[3]);
return 1;
}
switch (x[3]) {
case 0x10:
printf("Dummy block\n");
for (i = 5; i < 18; i++)
if (x[i] != 0x00)
has_valid_dummy_block = 0;
return 1;
case 0xF7:
/* TODO */
printf("Established timings III\n");
return 1;
case 0xF8:
{
int valid_cvt = 1; /* just this block */
printf("CVT 3-byte code descriptor:\n");
if (x[5] != 0x01) {
has_valid_cvt = 0;
return 0;
}
for (i = 0; i < 4; i++)
valid_cvt &= detailed_cvt_descriptor(x + 6 + (i * 3), (i == 0));
has_valid_cvt &= valid_cvt;
return valid_cvt;
}
case 0xF9:
/* TODO */
printf("Color management data\n");
return 1;
case 0xFA:
/* TODO */
printf("More standard timings\n");
return 1;
case 0xFB:
/* TODO */
printf("Color point\n");
return 1;
case 0xFC:
/* XXX should check for spaces after the \n */
/* XXX check: terminated with 0x0A, padded with 0x20 */
has_name_descriptor = 1;
if (strchr((char *)name, '\n')) return 1;
strncat((char *)name, (char *)x + 5, 13);
if (strchr((char *)name, '\n')) {
name_descriptor_terminated = 1;
printf("Monitor name: %s", name);
}
return 1;
case 0xFD:
{
int h_max_offset = 0, h_min_offset = 0;
int v_max_offset = 0, v_min_offset = 0;
int is_cvt = 0;
has_range_descriptor = 1;
/*
* XXX todo: implement feature flags, vtd blocks
* XXX check: ranges are well-formed; block termination if no vtd
*/
if (claims_one_point_four) {
if (x[4] & 0x02) {
v_max_offset = 255;
if (x[4] & 0x01) {
v_min_offset = 255;
}
}
if (x[4] & 0x04) {
h_max_offset = 255;
if (x[4] & 0x03) {
h_min_offset = 255;
}
}
} else if (x[4]) {
has_valid_range_descriptor = 0;
}
/*
* despite the values, this is not a bitfield.
* XXX only 0x00 and 0x02 are legal for pre-1.4
*/
switch (x[10]) {
case 0x00: /* default gtf */
break;
case 0x01: /* range limits only */
break;
case 0x02: /* secondary gtf curve */
break;
case 0x04: /* cvt */
is_cvt = 1;
break;
default: /* invalid */
break;
}
if (x[5] + v_min_offset > x[6] + v_max_offset)
has_valid_range_descriptor = 0;
if (x[7] + h_min_offset > x[8] + h_max_offset)
has_valid_range_descriptor = 0;
printf("Monitor ranges: %d-%dHZ vertical, %d-%dkHz horizontal",
x[5] + v_min_offset, x[6] + v_max_offset,
x[7] + h_min_offset, x[8] + h_max_offset);
if (x[9])
printf(", max dotclock %dMHz\n", x[9] * 10);
else {
if (claims_one_point_four)
has_valid_max_dotclock = 0;
printf("\n");
}
if (is_cvt) {
int max_h_pixels = 0;
printf("CVT version %d.%d\n", x[11] & 0xf0 >> 4, x[11] & 0x0f);
if (x[12] & 0xfc) {
int raw_offset = (x[12] & 0xfc) >> 2;
printf("Real max dotclock: %.2fMHz\n",
(x[9] * 10) - (raw_offset * 0.25));
if (raw_offset >= 40)
warning_excessive_dotclock_correction = 1;
}
max_h_pixels = x[12] & 0x03;
max_h_pixels <<= 8;
max_h_pixels |= x[13];
max_h_pixels *= 8;
if (max_h_pixels)
printf("Max active pixels per line: %d\n", max_h_pixels);
printf("Supported aspect ratios: %s %s %s %s %s\n",
x[14] & 0x80 ? "4:3" : "",
x[14] & 0x40 ? "16:9" : "",
x[14] & 0x20 ? "16:10" : "",
x[14] & 0x10 ? "5:4" : "",
x[14] & 0x08 ? "15:9" : "");
if (x[14] & 0x07)
has_valid_range_descriptor = 0;
printf("Preferred aspect ratio: ");
switch((x[15] & 0xe0) >> 5) {
case 0x00: printf("4:3"); break;
case 0x01: printf("16:9"); break;
case 0x02: printf("16:10"); break;
case 0x03: printf("5:4"); break;
case 0x04: printf("15:9"); break;
default: printf("(broken)"); break;
}
printf("\n");
if (x[15] & 0x04)
printf("Supports CVT standard blanking\n");
if (x[15] & 0x10)
printf("Supports CVT reduced blanking\n");
if (x[15] & 0x07)
has_valid_range_descriptor = 0;
if (x[16] & 0xf0) {
printf("Supported display scaling:\n");
if (x[16] & 0x80)
printf(" Horizontal shrink\n");
if (x[16] & 0x40)
printf(" Horizontal stretch\n");
if (x[16] & 0x20)
printf(" Vertical shrink\n");
if (x[16] & 0x10)
printf(" Vertical stretch\n");
}
if (x[16] & 0x0f)
has_valid_range_descriptor = 0;
if (x[17])
printf("Preferred vertical refresh: %d Hz\n", x[17]);
else
warning_zero_preferred_refresh = 1;
}
/*
* Slightly weird to return a global, but I've never seen any
* EDID block wth two range descriptors, so it's harmless.
*/
return has_valid_range_descriptor;
}
case 0xFE:
/*
* TODO: Two of these in a row, in the third and fouth slots,
* seems to be specified by SPWG: http://www.spwg.org/
*/
/* XXX check: terminated with 0x0A, padded with 0x20 */
printf("ASCII string: %s", x+5);
return 1;
case 0xFF:
/* XXX check: terminated with 0x0A, padded with 0x20 */
printf("Serial number: %s", x+5);
return 1;
default:
printf("Unknown monitor description type %d\n", x[3]);
return 0;
}
}
if (seen_non_detailed_descriptor && !in_extension) {
has_valid_descriptor_ordering = 0;
}
did_detailed_timing = 1;
ha = (x[2] + ((x[4] & 0xF0) << 4));
hbl = (x[3] + ((x[4] & 0x0F) << 8));
hso = (x[8] + ((x[11] & 0xC0) << 2));
hspw = (x[9] + ((x[11] & 0x30) << 4));
hborder = x[15];
va = (x[5] + ((x[7] & 0xF0) << 4));
vbl = (x[6] + ((x[7] & 0x0F) << 8));
vso = ((x[10] >> 4) + ((x[11] & 0x0C) << 2));
vspw = ((x[10] & 0x0F) + ((x[11] & 0x03) << 4));
vborder = x[16];
switch ((x[17] & 0x18) >> 3) {
case 0x00:
syncmethod = " analog composite";
break;
case 0x01:
syncmethod = " bipolar analog composite";
break;
case 0x02:
syncmethod = " digital composite";
break;
case 0x03:
syncmethod = "";
break;
}
pvsync = (x[17] & (1 << 2)) ? '+' : '-';
phsync = (x[17] & (1 << 1)) ? '+' : '-';
printf("Detailed mode: Clock %.3f MHz, %d mm x %d mm\n"
" %4d %4d %4d %4d hborder %d\n"
" %4d %4d %4d %4d vborder %d\n"
" %chsync %cvsync%s%s\n",
(x[0] + (x[1] << 8)) / 100.0,
(x[12] + ((x[14] & 0xF0) << 4)),
(x[13] + ((x[14] & 0x0F) << 8)),
ha, ha + hso, ha + hso + hspw, ha + hbl, hborder,
va, va + vso, va + vso + vspw, va + vbl, vborder,
phsync, pvsync, syncmethod, x[17] & 0x80 ? " interlaced" : ""
);
/* XXX flag decode */
return 1;
}
static void
do_checksum(unsigned char *x)
{
printf("Checksum: 0x%hx", x[0x7f]);
{
unsigned char sum = 0;
int i;
for (i = 0; i < 128; i++)
sum += x[i];
if (sum) {
printf(" (should be 0x%hx)", (unsigned char)(x[0x7f] - sum));
has_valid_checksum = 0;
}
}
printf("\n");
}
/* CEA extension */
static void
cea_video_block(unsigned char *x)
{
int i;
int length = x[0] & 0x1f;
for (i = 1; i < length; i++)
printf(" VIC %02d %s\n", x[i] & 0x7f, x[i] & 0x80 ? "(native)" : "");
}
static void
cea_hdmi_block(unsigned char *x)
{
int length = x[0] & 0x1f;
printf(" (HDMI)\n");
printf(" Source physical address %d.%d.%d.%d\n", x[4] >> 4, x[4] & 0x0f,
x[5] >> 4, x[5] & 0x0f);
if (length > 5) {
if (x[6] & 0x80)
printf(" Supports_AI\n");
if (x[6] & 0x40)
printf(" DC_48bit\n");
if (x[6] & 0x20)
printf(" DC_36bit\n");
if (x[6] & 0x10)
printf(" DC_30bit\n");
if (x[6] & 0x08)
printf(" DC_Y444\n");
/* two reserved */
if (x[6] & 0x01)
printf(" DVI_Dual\n");
}
if (length > 6)
printf(" Maximum TMDS clock: %dMHz\n", x[7] * 5);
/* latency info */
}
static void
cea_block(unsigned char *x)
{
unsigned int oui;
switch ((x[0] & 0xe0) >> 5) {
case 0x01:
printf(" Audio data block\n");
break;
case 0x02:
printf(" Video data block\n");
cea_video_block(x);
break;
case 0x03:
/* yes really, endianness lols */
oui = (x[3] << 16) + (x[2] << 8) + x[1];
printf(" Vendor-specific data block, OUI %06x", oui);
if (oui == 0x000c03)
cea_hdmi_block(x);
else
printf("\n");
break;
case 0x04:
printf(" Speaker allocation data block\n");
break;
case 0x05:
printf(" VESA DTC data block\n");
break;
case 0x07:
printf(" Extended tag: ");
switch (x[1]) {
case 0x00:
printf("video capability data block\n");
break;
case 0x01:
printf("vendor-specific video data block\n");
break;
case 0x02:
printf("VESA video display device information data block\n");
break;
case 0x03:
printf("VESA video data block\n");
break;
case 0x04:
printf("HDMI video data block\n");
break;
case 0x05:
printf("Colorimetry data block\n");
break;
case 0x10:
printf("CEA miscellaneous audio fields\n");
break;
case 0x11:
printf("Vendor-specific audio data block\n");
break;
case 0x12:
printf("HDMI audio data block\n");
break;
default:
if (x[1] >= 6 && x[1] <= 15)
printf("Reserved video block (%02x)\n", x[1]);
else if (x[1] >= 19 && x[1] <= 31)
printf("Reserved audio block (%02x)\n", x[1]);
else
printf("Unknown (%02x)\n", x[1]);
break;
}
break;
default:
{
int tag = (*x & 0xe0) >> 5;
int length = *x & 0x1f;
printf(" Unknown tag %d, length %d (raw %02x)\n", tag, length, *x);
break;
}
}
}
static int
parse_cea(unsigned char *x)
{
int ret = 0;
int version = x[1];
int offset = x[2];
unsigned char *detailed;
if (version >= 1) do {
if (version == 1 && x[3] != 0)
ret = 1;
if (offset < 4)
break;
if (version < 3) {
printf("%d 8-byte timing descriptors\n", (offset - 4) / 8);
if (offset - 4 > 0)
/* do stuff */ ;
} else if (version == 3) {
int i;
printf("%d bytes of CEA data\n", offset - 4);
for (i = 4; i < offset; i += (x[i] & 0x1f) + 1) {
cea_block(x + i);
}
}
if (version >= 2) {
if (x[3] & 0x80)
printf("Underscans PC formats by default\n");
if (x[3] & 0x40)
printf("Basic audio support\n");
if (x[3] & 0x20)
printf("Supports YCbCr 4:4:4\n");
if (x[3] & 0x10)
printf("Supports YCbCr 4:2:2\n");
printf("%d native detailed modes\n", x[3] & 0x0f);
}
for (detailed = x + offset; detailed + 18 < x + 127; detailed += 18)
if (detailed[0])
detailed_block(detailed, 1);
} while (0);
do_checksum(x);
return ret;
}
/* generic extension code */
static void
extension_version(unsigned char *x)
{
printf("Extension version: %d\n", x[1]);
}
static int
parse_extension(unsigned char *x)
{
int conformant_extension;
printf("\n");
switch(x[0]) {
case 0x02:
printf("CEA extension block\n");
extension_version(x);
conformant_extension = parse_cea(x);
break;
case 0x10: printf("VTB extension block\n"); break;
case 0x40: printf("DI extension block\n"); break;
case 0x50: printf("LS extension block\n"); break;
case 0x60: printf("DPVL extension block\n"); break;
case 0xF0: printf("Block map\n"); break;
case 0xFF: printf("Manufacturer-specific extension block\n");
default:
printf("Unknown extension block\n");
break;
}
printf("\n");
return conformant_extension;
}
static int edid_lines = 0;
static unsigned char *
extract_edid(int fd)
{
char *ret = NULL;
char *start, *c;
unsigned char *out = NULL;
int state = 0;
int lines = 0;
int i;
int out_index = 0;
int len, size;
ret = malloc(1024);
size = 1024;
len = 0;
for (;;) {
i = read(fd, ret + len, size - len);
if (i < 0) {
free(ret);
return 0;
}
if (i == 0)
break;
len += i;
if (len == size)
ret = realloc(ret, size + 1024);
}
start = strstr(ret, "EDID_DATA:");
if (start == NULL)
start = strstr(ret, "EDID:");
/* Look for xrandr --verbose output (8 lines of 16 hex bytes) */
if (start != NULL) {
const char indentation1[] = " ";
const char indentation2[] = "\t\t";
const char *indentation;
unsigned char *out;
char *s;
out = malloc(128);
if (out == NULL)
return NULL;
for (i = 0; i < 8; i++) {
int j;
/* Get the next start of the line of EDID hex. */
s = strstr(start, indentation = indentation1);
if (!s)
s = strstr(start, indentation = indentation2);
if (s == NULL) {
free(ret);
free(out);
return NULL;
}
start = s + strlen(indentation);
c = start;
for (j = 0; j < 16; j++) {
char buf[3];
/* Read a %02x from the log */
if (!isxdigit(c[0]) || !isxdigit(c[1])) {
free(ret);
free(out);
return NULL;
}
buf[0] = c[0];
buf[1] = c[1];
buf[2] = 0;
out[out_index++] = strtol(buf, NULL, 16);
c += 2;
}
}
free(ret);
return out;
}
/* wait, is this a log file? */
for (i = 0; i < 8; i++) {
if (!isascii(ret[i])) {
edid_lines = len / 16;
return (unsigned char *)ret;
}
}
/* I think it is, let's go scanning */
if (!(start = strstr(ret, "EDID (in hex):")))
return (unsigned char *)ret;
if (!(start = strstr(start, "(II)")))
return (unsigned char *)ret;
for (c = start; *c; c++) {
if (state == 0) {
/* skip ahead to the : */
if (!(c = strstr(c, ": \t")))
break;
/* and find the first number */
while (!isxdigit(c[1]))
c++;
state = 1;
lines++;
out = realloc(out, lines * 16);
} else if (state == 1) {
char buf[3];
/* Read a %02x from the log */
if (!isxdigit(*c)) {
state = 0;
continue;
}
buf[0] = c[0];
buf[1] = c[1];
buf[2] = 0;
out[out_index++] = strtol(buf, NULL, 16);
c++;
}
}
edid_lines = lines;
free(ret);
return out;
}
static const struct {
int x, y, refresh;
} established_timings[] = {
/* 0x23 bit 7 - 0 */
{720, 400, 70},
{720, 400, 88},
{640, 480, 60},
{640, 480, 67},
{640, 480, 72},
{640, 480, 75},
{800, 600, 56},
{800, 600, 60},
/* 0x24 bit 7 - 0 */
{800, 600, 72},
{800, 600, 75},
{832, 624, 75},
{1280, 768, 87},
{1024, 768, 60},
{1024, 768, 70},
{1024, 768, 75},
{1280, 1024, 75},
/* 0x25 bit 7*/
{1152, 870, 75},
};
static void print_subsection(char *name, unsigned char *edid, int start,
int end)
{
int i;
printf("%s:", name);
for (i = strlen(name); i < 15; i++)
printf(" ");
for (i = start; i <= end; i++)
printf(" %02x", edid[i]);
printf("\n");
}
static void dump_breakdown(unsigned char *edid)
{
printf("Extracted contents:\n");
print_subsection("header", edid, 0, 7);
print_subsection("serial number", edid, 8, 17);
print_subsection("version", edid,18, 19);
print_subsection("basic params", edid, 20, 24);
print_subsection("chroma info", edid, 25, 34);
print_subsection("established", edid, 35, 37);
print_subsection("standard", edid, 38, 53);
print_subsection("descriptor 1", edid, 54, 71);
print_subsection("descriptor 2", edid, 72, 89);
print_subsection("descriptor 3", edid, 90, 107);
print_subsection("descriptor 4", edid, 108, 125);
print_subsection("extensions", edid, 126, 126);
print_subsection("checksum", edid, 127, 127);
printf("\n");
}
int main(int argc, char **argv)
{
int fd;
unsigned char *edid;
unsigned char *x;
time_t the_time;
struct tm *ptm;
int analog, i;
if (argc != 2) {
fd = 0;
} else {
if ((fd = open(argv[1], O_RDONLY)) == -1) {
perror(argv[1]);
return 1;
}
}
edid = extract_edid(fd);
if (!edid) {
fprintf(stderr, "edid extract failed\n");
return 1;
}
if (fd != 0)
close(fd);
dump_breakdown(edid);
if (!edid || memcmp(edid, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", 8)) {
printf("No header found\n");
// return 1;
}
printf("Manufacturer: %s Model %x Serial Number %u\n",
manufacturer_name(edid + 0x08),
(unsigned short)(edid[0x0A] + (edid[0x0B] << 8)),
(unsigned int)(edid[0x0C] + (edid[0x0D] << 8)
+ (edid[0x0E] << 16) + (edid[0x0F] << 24)));
/* XXX need manufacturer ID table */
time(&the_time);
ptm = localtime(&the_time);
if (edid[0x10] < 55 || edid[0x10] == 0xff) {
has_valid_week = 1;
if (edid[0x11] > 0x0f) {
if (edid[0x10] == 0xff) {
has_valid_year = 1;
printf("Made week %hd of model year %hd\n", edid[0x10],
edid[0x11]);
} else if (edid[0x11] + 90 <= ptm->tm_year) {
has_valid_year = 1;
printf("Made week %hd of %hd\n", edid[0x10], edid[0x11] + 1990);
}
}
}
printf("EDID version: %hd.%hd\n", edid[0x12], edid[0x13]);
if (edid[0x12] == 1) {
if (edid[0x13] > 4) {
printf("Claims > 1.4, assuming 1.4 conformance\n");
edid[0x13] = 4;
}
switch (edid[0x13]) {
case 4:
claims_one_point_four = 1;
case 3:
claims_one_point_three = 1;
case 2:
claims_one_point_two = 1;
default:
break;
}
claims_one_point_oh = 1;
}
/* display section */
if (edid[0x14] & 0x80) {
int conformance_mask;
analog = 0;
printf("Digital display\n");
if (claims_one_point_four) {
conformance_mask = 0;
if ((edid[0x14] & 0x70) == 0x00)
printf("Color depth is undefined\n");
else if ((edid[0x14] & 0x70) == 0x70)
nonconformant_digital_display = 1;
else
printf("%d bits per primary color channel\n",
((edid[0x14] & 0x70) >> 3) + 4);
switch (edid[0x14] & 0x0f) {
case 0x00: printf("Digital interface is not defined\n"); break;
case 0x01: printf("DVI interface\n"); break;
case 0x02: printf("HDMI-a interface\n"); break;
case 0x03: printf("HDMI-b interface\n"); break;
case 0x04: printf("MDDI interface\n"); break;
case 0x05: printf("DisplayPort interface\n"); break;
default:
nonconformant_digital_display = 1;
}
} else if (claims_one_point_two) {
conformance_mask = 0x7E;
if (edid[0x14] & 0x01) {
printf("DFP 1.x compatible TMDS\n");
}
} else conformance_mask = 0x7F;
if (!nonconformant_digital_display)
nonconformant_digital_display = edid[0x14] & conformance_mask;
} else {
analog = 1;
int voltage = (edid[0x14] & 0x60) >> 5;
int sync = (edid[0x14] & 0x0F);
printf("Analog display, Input voltage level: %s V\n",
voltage == 3 ? "0.7/0.7" :
voltage == 2 ? "1.0/0.4" :
voltage == 1 ? "0.714/0.286" :
"0.7/0.3");
if (claims_one_point_four) {
if (edid[0x14] & 0x10)
printf("Blank-to-black setup/pedestal\n");
else
printf("Blank level equals black level\n");
} else if (edid[0x14] & 0x10) {
/*
* XXX this is just the X text. 1.3 says "if set, display expects
* a blank-to-black setup or pedestal per appropriate Signal
* Level Standard". Whatever _that_ means.
*/
printf("Configurable signal levels\n");
}
printf("Sync: %s%s%s%s\n", sync & 0x08 ? "Separate " : "",
sync & 0x04 ? "Composite " : "",
sync & 0x02 ? "SyncOnGreen " : "",
sync & 0x01 ? "Serration " : "");
}
if (edid[0x15] && edid[0x16])
printf("Maximum image size: %d cm x %d cm\n", edid[0x15], edid[0x16]);
else if (claims_one_point_four && (edid[0x15] || edid[0x16])) {
if (edid[0x15])
printf("Aspect ratio is %f (landscape)\n", 100.0/(edid[0x16] + 99));
else
printf("Aspect ratio is %f (portrait)\n", 100.0/(edid[0x15] + 99));
} else {
/* Either or both can be zero for 1.3 and before */
printf("Image size is variable\n");
}
if (edid[0x17] == 0xff) {
if (claims_one_point_four)
printf("Gamma is defined in an extension block\n");
else
/* XXX Technically 1.3 doesn't say this... */
printf("Gamma: 1.0\n");
} else printf("Gamma: %.2f\n", ((edid[0x17] + 100.0) / 100.0));
if (edid[0x18] & 0xE0) {
printf("DPMS levels:");
if (edid[0x18] & 0x80) printf(" Standby");
if (edid[0x18] & 0x40) printf(" Suspend");
if (edid[0x18] & 0x20) printf(" Off");
printf("\n");
}
/* FIXME: this is from 1.4 spec, check earlier */