SDL  2.0
edid-parse.c File Reference
#include "../../SDL_internal.h"
#include "SDL_stdinc.h"
#include "edid.h"
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdio.h>
+ Include dependency graph for edid-parse.c:

Go to the source code of this file.

Macros

#define TRUE   1
 
#define FALSE   0
 

Functions

static int get_bit (int in, int bit)
 
static int get_bits (int in, int begin, int end)
 
static int decode_header (const uchar *edid)
 
static int decode_vendor_and_product_identification (const uchar *edid, MonitorInfo *info)
 
static int decode_edid_version (const uchar *edid, MonitorInfo *info)
 
static int decode_display_parameters (const uchar *edid, MonitorInfo *info)
 
static double decode_fraction (int high, int low)
 
static int decode_color_characteristics (const uchar *edid, MonitorInfo *info)
 
static int decode_established_timings (const uchar *edid, MonitorInfo *info)
 
static int decode_standard_timings (const uchar *edid, MonitorInfo *info)
 
static void decode_lf_string (const uchar *s, int n_chars, char *result)
 
static void decode_display_descriptor (const uchar *desc, MonitorInfo *info)
 
static void decode_detailed_timing (const uchar *timing, DetailedTiming *detailed)
 
static int decode_descriptors (const uchar *edid, MonitorInfo *info)
 
static void decode_check_sum (const uchar *edid, MonitorInfo *info)
 
MonitorInfodecode_edid (const uchar *edid)
 
static const char * yesno (int v)
 
void dump_monitor_info (MonitorInfo *info)
 

Macro Definition Documentation

◆ FALSE

#define FALSE   0

◆ TRUE

Function Documentation

◆ decode_check_sum()

static void decode_check_sum ( const uchar edid,
MonitorInfo info 
)
static

Definition at line 510 of file edid-parse.c.

References MonitorInfo::checksum, and i.

Referenced by decode_edid().

512 {
513  int i;
514  uchar check = 0;
515 
516  for (i = 0; i < 128; ++i)
517  check += edid[i];
518 
519  info->checksum = check;
520 }
int checksum
Definition: edid.h:82
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
unsigned char uchar
Definition: edid.h:1

◆ decode_color_characteristics()

static int decode_color_characteristics ( const uchar edid,
MonitorInfo info 
)
static

Definition at line 258 of file edid-parse.c.

References MonitorInfo::blue_x, MonitorInfo::blue_y, decode_fraction(), get_bits(), MonitorInfo::green_x, MonitorInfo::green_y, MonitorInfo::red_x, MonitorInfo::red_y, TRUE, MonitorInfo::white_x, and MonitorInfo::white_y.

Referenced by decode_edid().

259 {
260  info->red_x = decode_fraction (edid[0x1b], get_bits (edid[0x19], 6, 7));
261  info->red_y = decode_fraction (edid[0x1c], get_bits (edid[0x19], 5, 4));
262  info->green_x = decode_fraction (edid[0x1d], get_bits (edid[0x19], 2, 3));
263  info->green_y = decode_fraction (edid[0x1e], get_bits (edid[0x19], 0, 1));
264  info->blue_x = decode_fraction (edid[0x1f], get_bits (edid[0x1a], 6, 7));
265  info->blue_y = decode_fraction (edid[0x20], get_bits (edid[0x1a], 4, 5));
266  info->white_x = decode_fraction (edid[0x21], get_bits (edid[0x1a], 2, 3));
267  info->white_y = decode_fraction (edid[0x22], get_bits (edid[0x1a], 0, 1));
268 
269  return TRUE;
270 }
double green_y
Definition: edid.h:140
static int get_bits(int in, int begin, int end)
Definition: edid-parse.c:43
double white_y
Definition: edid.h:144
double red_x
Definition: edid.h:137
double blue_x
Definition: edid.h:141
static double decode_fraction(int high, int low)
Definition: edid-parse.c:244
#define TRUE
Definition: edid-parse.c:33
double white_x
Definition: edid.h:143
double green_x
Definition: edid.h:139
double blue_y
Definition: edid.h:142
double red_y
Definition: edid.h:138

◆ decode_descriptors()

static int decode_descriptors ( const uchar edid,
MonitorInfo info 
)
static

Definition at line 482 of file edid-parse.c.

References decode_detailed_timing(), decode_display_descriptor(), MonitorInfo::detailed_timings, i, MonitorInfo::n_detailed_timings, and TRUE.

Referenced by decode_edid().

483 {
484  int i;
485  int timing_idx;
486 
487  timing_idx = 0;
488 
489  for (i = 0; i < 4; ++i)
490  {
491  int index = 0x36 + i * 18;
492 
493  if (edid[index + 0] == 0x00 && edid[index + 1] == 0x00)
494  {
495  decode_display_descriptor (edid + index, info);
496  }
497  else
498  {
500  edid + index, &(info->detailed_timings[timing_idx++]));
501  }
502  }
503 
504  info->n_detailed_timings = timing_idx;
505 
506  return TRUE;
507 }
int n_detailed_timings
Definition: edid.h:149
static void decode_detailed_timing(const uchar *timing, DetailedTiming *detailed)
Definition: edid-parse.c:419
static void decode_display_descriptor(const uchar *desc, MonitorInfo *info)
Definition: edid-parse.c:381
#define TRUE
Definition: edid-parse.c:33
GLuint index
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
DetailedTiming detailed_timings[4]
Definition: edid.h:150

◆ decode_detailed_timing()

static void decode_detailed_timing ( const uchar timing,
DetailedTiming detailed 
)
static

Definition at line 419 of file edid-parse.c.

References DetailedTiming::ad, DetailedTiming::analog, DetailedTiming::digital, DetailedTiming::digital_sync, FALSE, FIELD_LEFT, FIELD_RIGHT, FOUR_WAY_INTERLEAVED, get_bit(), get_bits(), DetailedTiming::h_addr, DetailedTiming::h_blank, DetailedTiming::h_front_porch, DetailedTiming::h_sync, DetailedTiming::height_mm, DetailedTiming::interlaced, NO_STEREO, DetailedTiming::pixel_clock, DetailedTiming::right_border, SIDE_BY_SIDE, DetailedTiming::stereo, DetailedTiming::top_border, TWO_WAY_LEFT_ON_EVEN, TWO_WAY_RIGHT_ON_EVEN, DetailedTiming::v_addr, DetailedTiming::v_blank, DetailedTiming::v_front_porch, DetailedTiming::v_sync, and DetailedTiming::width_mm.

Referenced by decode_descriptors().

421 {
422  int bits;
423  StereoType stereo[] =
424  {
428  };
429 
430  detailed->pixel_clock = (timing[0x00] | timing[0x01] << 8) * 10000;
431  detailed->h_addr = timing[0x02] | ((timing[0x04] & 0xf0) << 4);
432  detailed->h_blank = timing[0x03] | ((timing[0x04] & 0x0f) << 8);
433  detailed->v_addr = timing[0x05] | ((timing[0x07] & 0xf0) << 4);
434  detailed->v_blank = timing[0x06] | ((timing[0x07] & 0x0f) << 8);
435  detailed->h_front_porch = timing[0x08] | get_bits (timing[0x0b], 6, 7) << 8;
436  detailed->h_sync = timing[0x09] | get_bits (timing[0x0b], 4, 5) << 8;
437  detailed->v_front_porch =
438  get_bits (timing[0x0a], 4, 7) | get_bits (timing[0x0b], 2, 3) << 4;
439  detailed->v_sync =
440  get_bits (timing[0x0a], 0, 3) | get_bits (timing[0x0b], 0, 1) << 4;
441  detailed->width_mm = timing[0x0c] | get_bits (timing[0x0e], 4, 7) << 8;
442  detailed->height_mm = timing[0x0d] | get_bits (timing[0x0e], 0, 3) << 8;
443  detailed->right_border = timing[0x0f];
444  detailed->top_border = timing[0x10];
445 
446  detailed->interlaced = get_bit (timing[0x11], 7);
447 
448  /* Stereo */
449  bits = get_bits (timing[0x11], 5, 6) << 1 | get_bit (timing[0x11], 0);
450  detailed->stereo = stereo[bits];
451 
452  /* Sync */
453  bits = timing[0x11];
454 
455  detailed->digital_sync = get_bit (bits, 4);
456  if (detailed->digital_sync)
457  {
458  detailed->ad.digital.composite = !get_bit (bits, 3);
459 
460  if (detailed->ad.digital.composite)
461  {
462  detailed->ad.digital.serrations = get_bit (bits, 2);
463  detailed->ad.digital.negative_vsync = FALSE;
464  }
465  else
466  {
467  detailed->ad.digital.serrations = FALSE;
468  detailed->ad.digital.negative_vsync = !get_bit (bits, 2);
469  }
470 
471  detailed->ad.digital.negative_hsync = !get_bit (bits, 0);
472  }
473  else
474  {
475  detailed->ad.analog.bipolar = get_bit (bits, 3);
476  detailed->ad.analog.serrations = get_bit (bits, 2);
477  detailed->ad.analog.sync_on_green = !get_bit (bits, 1);
478  }
479 }
int h_sync
Definition: edid.h:47
int h_front_porch
Definition: edid.h:48
static int get_bits(int in, int begin, int end)
Definition: edid-parse.c:43
struct DetailedTiming::@40::@41 analog
int interlaced
Definition: edid.h:57
int height_mm
Definition: edid.h:54
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const void * bits
int pixel_clock
Definition: edid.h:44
static int get_bit(int in, int bit)
Definition: edid-parse.c:37
int digital_sync
Definition: edid.h:60
int top_border
Definition: edid.h:56
int right_border
Definition: edid.h:55
struct DetailedTiming::@40::@42 digital
int v_front_porch
Definition: edid.h:52
StereoType
Definition: edid.h:24
int v_addr
Definition: edid.h:49
int h_addr
Definition: edid.h:45
int v_sync
Definition: edid.h:51
StereoType stereo
Definition: edid.h:58
int width_mm
Definition: edid.h:53
int v_blank
Definition: edid.h:50
Definition: edid.h:26
#define FALSE
Definition: edid-parse.c:34
int h_blank
Definition: edid.h:46
union DetailedTiming::@40 ad

◆ decode_display_descriptor()

static void decode_display_descriptor ( const uchar desc,
MonitorInfo info 
)
static

Definition at line 381 of file edid-parse.c.

References decode_lf_string(), MonitorInfo::dsc_product_name, MonitorInfo::dsc_serial_number, and MonitorInfo::dsc_string.

Referenced by decode_descriptors().

383 {
384  switch (desc[0x03])
385  {
386  case 0xFC:
387  decode_lf_string (desc + 5, 13, info->dsc_product_name);
388  break;
389  case 0xFF:
390  decode_lf_string (desc + 5, 13, info->dsc_serial_number);
391  break;
392  case 0xFE:
393  decode_lf_string (desc + 5, 13, info->dsc_string);
394  break;
395  case 0xFD:
396  /* Range Limits */
397  break;
398  case 0xFB:
399  /* Color Point */
400  break;
401  case 0xFA:
402  /* Timing Identifications */
403  break;
404  case 0xF9:
405  /* Color Management */
406  break;
407  case 0xF8:
408  /* Timing Codes */
409  break;
410  case 0xF7:
411  /* Established Timings */
412  break;
413  case 0x10:
414  break;
415  }
416 }
char dsc_product_name[14]
Definition: edid.h:160
static void decode_lf_string(const uchar *s, int n_chars, char *result)
Definition: edid-parse.c:358
char dsc_string[14]
Definition: edid.h:161
char dsc_serial_number[14]
Definition: edid.h:159

◆ decode_display_parameters()

static int decode_display_parameters ( const uchar edid,
MonitorInfo info 
)
static

Definition at line 123 of file edid-parse.c.

References MonitorInfo::active_off, MonitorInfo::ad, MonitorInfo::analog, MonitorInfo::aspect_ratio, MonitorInfo::continuous_frequency, MonitorInfo::digital, DISPLAY_PORT, DVI, MonitorInfo::gamma, get_bit(), get_bits(), HDMI_A, HDMI_B, MonitorInfo::height_mm, MonitorInfo::is_digital, MDDI, MONOCHROME, OTHER_COLOR, MonitorInfo::preferred_timing_includes_native, RGB, MonitorInfo::srgb_is_standard, MonitorInfo::standby, MonitorInfo::suspend, TRUE, UNDEFINED, UNDEFINED_COLOR, and MonitorInfo::width_mm.

Referenced by decode_edid().

124 {
125  /* Digital vs Analog */
126  info->is_digital = get_bit (edid[0x14], 7);
127 
128  if (info->is_digital)
129  {
130  int bits;
131 
132  static const int bit_depth[8] =
133  {
134  -1, 6, 8, 10, 12, 14, 16, -1
135  };
136 
137  static const Interface interfaces[6] =
138  {
140  };
141 
142  bits = get_bits (edid[0x14], 4, 6);
143  info->ad.digital.bits_per_primary = bit_depth[bits];
144 
145  bits = get_bits (edid[0x14], 0, 3);
146 
147  if (bits <= 5)
148  info->ad.digital.interface = interfaces[bits];
149  else
150  info->ad.digital.interface = UNDEFINED;
151  }
152  else
153  {
154  int bits = get_bits (edid[0x14], 5, 6);
155 
156  static const double levels[][3] =
157  {
158  { 0.7, 0.3, 1.0 },
159  { 0.714, 0.286, 1.0 },
160  { 1.0, 0.4, 1.4 },
161  { 0.7, 0.0, 0.7 },
162  };
163 
164  info->ad.analog.video_signal_level = levels[bits][0];
165  info->ad.analog.sync_signal_level = levels[bits][1];
166  info->ad.analog.total_signal_level = levels[bits][2];
167 
168  info->ad.analog.blank_to_black = get_bit (edid[0x14], 4);
169 
170  info->ad.analog.separate_hv_sync = get_bit (edid[0x14], 3);
171  info->ad.analog.composite_sync_on_h = get_bit (edid[0x14], 2);
172  info->ad.analog.composite_sync_on_green = get_bit (edid[0x14], 1);
173 
174  info->ad.analog.serration_on_vsync = get_bit (edid[0x14], 0);
175  }
176 
177  /* Screen Size / Aspect Ratio */
178  if (edid[0x15] == 0 && edid[0x16] == 0)
179  {
180  info->width_mm = -1;
181  info->height_mm = -1;
182  info->aspect_ratio = -1.0;
183  }
184  else if (edid[0x16] == 0)
185  {
186  info->width_mm = -1;
187  info->height_mm = -1;
188  info->aspect_ratio = 100.0 / (edid[0x15] + 99);
189  }
190  else if (edid[0x15] == 0)
191  {
192  info->width_mm = -1;
193  info->height_mm = -1;
194  info->aspect_ratio = 100.0 / (edid[0x16] + 99);
195  info->aspect_ratio = 1/info->aspect_ratio; /* portrait */
196  }
197  else
198  {
199  info->width_mm = 10 * edid[0x15];
200  info->height_mm = 10 * edid[0x16];
201  }
202 
203  /* Gamma */
204  if (edid[0x17] == 0xFF)
205  info->gamma = -1.0;
206  else
207  info->gamma = (edid[0x17] + 100.0) / 100.0;
208 
209  /* Features */
210  info->standby = get_bit (edid[0x18], 7);
211  info->suspend = get_bit (edid[0x18], 6);
212  info->active_off = get_bit (edid[0x18], 5);
213 
214  if (info->is_digital)
215  {
216  info->ad.digital.rgb444 = TRUE;
217  if (get_bit (edid[0x18], 3))
218  info->ad.digital.ycrcb444 = 1;
219  if (get_bit (edid[0x18], 4))
220  info->ad.digital.ycrcb422 = 1;
221  }
222  else
223  {
224  int bits = get_bits (edid[0x18], 3, 4);
225  ColorType color_type[4] =
226  {
228  };
229 
230  info->ad.analog.color_type = color_type[bits];
231  }
232 
233  info->srgb_is_standard = get_bit (edid[0x18], 2);
234 
235  /* In 1.3 this is called "has preferred timing" */
236  info->preferred_timing_includes_native = get_bit (edid[0x18], 1);
237 
238  /* FIXME: In 1.3 this indicates whether the monitor accepts GTF */
239  info->continuous_frequency = get_bit (edid[0x18], 0);
240  return TRUE;
241 }
Definition: edid.h:20
static int get_bits(int in, int begin, int end)
Definition: edid-parse.c:43
Definition: edid.h:8
int active_off
Definition: edid.h:131
int suspend
Definition: edid.h:130
int standby
Definition: edid.h:129
ColorType
Definition: edid.h:16
Definition: edid.h:10
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const void * bits
struct MonitorInfo::@43::@45 analog
int width_mm
Definition: edid.h:123
union MonitorInfo::@43 ad
static int get_bit(int in, int bit)
Definition: edid-parse.c:37
Definition: edid.h:11
#define TRUE
Definition: edid-parse.c:33
Definition: edid.h:12
int continuous_frequency
Definition: edid.h:135
double aspect_ratio
Definition: edid.h:125
int preferred_timing_includes_native
Definition: edid.h:134
GLsizei levels
int srgb_is_standard
Definition: edid.h:133
int is_digital
Definition: edid.h:94
struct MonitorInfo::@43::@44 digital
int height_mm
Definition: edid.h:124
Definition: edid.h:9
double gamma
Definition: edid.h:127
Interface
Definition: edid.h:6

◆ decode_edid()

MonitorInfo* decode_edid ( const uchar edid)

Definition at line 523 of file edid-parse.c.

References decode_check_sum(), decode_color_characteristics(), decode_descriptors(), decode_display_parameters(), decode_edid_version(), decode_established_timings(), decode_header(), decode_standard_timings(), decode_vendor_and_product_identification(), free, and NULL.

524 {
525  MonitorInfo *info = calloc (1, sizeof (MonitorInfo));
526 
527  decode_check_sum (edid, info);
528 
529  if (!decode_header (edid) ||
531  !decode_edid_version (edid, info) ||
532  !decode_display_parameters (edid, info) ||
533  !decode_color_characteristics (edid, info) ||
534  !decode_established_timings (edid, info) ||
535  !decode_standard_timings (edid, info) ||
536  !decode_descriptors (edid, info)) {
537  free(info);
538  return NULL;
539  }
540 
541  return info;
542 }
static int decode_color_characteristics(const uchar *edid, MonitorInfo *info)
Definition: edid-parse.c:258
static int decode_header(const uchar *edid)
Definition: edid-parse.c:51
SDL_EventEntry * free
Definition: SDL_events.c:84
static int decode_edid_version(const uchar *edid, MonitorInfo *info)
Definition: edid-parse.c:114
static int decode_established_timings(const uchar *edid, MonitorInfo *info)
Definition: edid-parse.c:273
static void decode_check_sum(const uchar *edid, MonitorInfo *info)
Definition: edid-parse.c:510
static int decode_display_parameters(const uchar *edid, MonitorInfo *info)
Definition: edid-parse.c:123
static int decode_vendor_and_product_identification(const uchar *edid, MonitorInfo *info)
Definition: edid-parse.c:59
#define NULL
Definition: begin_code.h:164
static int decode_descriptors(const uchar *edid, MonitorInfo *info)
Definition: edid-parse.c:482
static int decode_standard_timings(const uchar *edid, MonitorInfo *info)
Definition: edid-parse.c:326

◆ decode_edid_version()

static int decode_edid_version ( const uchar edid,
MonitorInfo info 
)
static

Definition at line 114 of file edid-parse.c.

References MonitorInfo::major_version, MonitorInfo::minor_version, and TRUE.

Referenced by decode_edid().

115 {
116  info->major_version = edid[0x12];
117  info->minor_version = edid[0x13];
118 
119  return TRUE;
120 }
int minor_version
Definition: edid.h:92
int major_version
Definition: edid.h:91
#define TRUE
Definition: edid-parse.c:33

◆ decode_established_timings()

static int decode_established_timings ( const uchar edid,
MonitorInfo info 
)
static

Definition at line 273 of file edid-parse.c.

References MonitorInfo::established, get_bit(), i, j, and TRUE.

Referenced by decode_edid().

274 {
275  static const Timing established[][8] =
276  {
277  {
278  { 800, 600, 60 },
279  { 800, 600, 56 },
280  { 640, 480, 75 },
281  { 640, 480, 72 },
282  { 640, 480, 67 },
283  { 640, 480, 60 },
284  { 720, 400, 88 },
285  { 720, 400, 70 }
286  },
287  {
288  { 1280, 1024, 75 },
289  { 1024, 768, 75 },
290  { 1024, 768, 70 },
291  { 1024, 768, 60 },
292  { 1024, 768, 87 },
293  { 832, 624, 75 },
294  { 800, 600, 75 },
295  { 800, 600, 72 }
296  },
297  {
298  { 0, 0, 0 },
299  { 0, 0, 0 },
300  { 0, 0, 0 },
301  { 0, 0, 0 },
302  { 0, 0, 0 },
303  { 0, 0, 0 },
304  { 0, 0, 0 },
305  { 1152, 870, 75 }
306  },
307  };
308 
309  int i, j, idx;
310 
311  idx = 0;
312  for (i = 0; i < 3; ++i)
313  {
314  for (j = 0; j < 8; ++j)
315  {
316  int byte = edid[0x23 + i];
317 
318  if (get_bit (byte, j) && established[i][j].frequency != 0)
319  info->established[idx++] = established[i][j];
320  }
321  }
322  return TRUE;
323 }
Definition: edid.h:35
static int get_bit(int in, int bit)
Definition: edid-parse.c:37
#define TRUE
Definition: edid-parse.c:33
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int int in j)
Definition: SDL_x11sym.h:50
Timing established[24]
Definition: edid.h:146
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50

◆ decode_fraction()

static double decode_fraction ( int  high,
int  low 
)
static

Definition at line 244 of file edid-parse.c.

References get_bit(), i, and SDL_pow.

Referenced by decode_color_characteristics().

245 {
246  double result = 0.0;
247  int i;
248 
249  high = (high << 2) | low;
250 
251  for (i = 0; i < 10; ++i)
252  result += get_bit (high, i) * SDL_pow (2, i - 10);
253 
254  return result;
255 }
GLuint64EXT * result
static int get_bit(int in, int bit)
Definition: edid-parse.c:37
#define SDL_pow
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50

◆ decode_header()

static int decode_header ( const uchar edid)
static

Definition at line 51 of file edid-parse.c.

References FALSE, and TRUE.

Referenced by decode_edid().

52 {
53  if (memcmp (edid, "\x00\xff\xff\xff\xff\xff\xff\x00", 8) == 0)
54  return TRUE;
55  return FALSE;
56 }
#define TRUE
Definition: edid-parse.c:33
#define FALSE
Definition: edid-parse.c:34

◆ decode_lf_string()

static void decode_lf_string ( const uchar s,
int  n_chars,
char *  result 
)
static

Definition at line 358 of file edid-parse.c.

References i.

Referenced by decode_display_descriptor().

359 {
360  int i;
361  for (i = 0; i < n_chars; ++i)
362  {
363  if (s[i] == 0x0a)
364  {
365  *result++ = '\0';
366  break;
367  }
368  else if (s[i] == 0x00)
369  {
370  /* Convert embedded 0's to spaces */
371  *result++ = ' ';
372  }
373  else
374  {
375  *result++ = s[i];
376  }
377  }
378 }
GLuint64EXT * result
GLdouble s
Definition: SDL_opengl.h:2063
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50

◆ decode_standard_timings()

static int decode_standard_timings ( const uchar edid,
MonitorInfo info 
)
static

Definition at line 326 of file edid-parse.c.

References Timing::frequency, get_bits(), Timing::height, i, MonitorInfo::standard, TRUE, and Timing::width.

Referenced by decode_edid().

327 {
328  int i;
329 
330  for (i = 0; i < 8; i++)
331  {
332  int first = edid[0x26 + 2 * i];
333  int second = edid[0x27 + 2 * i];
334 
335  if (first != 0x01 && second != 0x01)
336  {
337  int w = 8 * (first + 31);
338  int h = 0;
339 
340  switch (get_bits (second, 6, 7))
341  {
342  case 0x00: h = (w / 16) * 10; break;
343  case 0x01: h = (w / 4) * 3; break;
344  case 0x02: h = (w / 5) * 4; break;
345  case 0x03: h = (w / 16) * 9; break;
346  }
347 
348  info->standard[i].width = w;
349  info->standard[i].height = h;
350  info->standard[i].frequency = get_bits (second, 0, 5) + 60;
351  }
352  }
353 
354  return TRUE;
355 }
int frequency
Definition: edid.h:39
int height
Definition: edid.h:38
static int get_bits(int in, int begin, int end)
Definition: edid-parse.c:43
const GLint * first
GLfloat GLfloat GLfloat GLfloat h
int width
Definition: edid.h:37
Timing standard[8]
Definition: edid.h:147
#define TRUE
Definition: edid-parse.c:33
GLubyte GLubyte GLubyte GLubyte w
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50

◆ decode_vendor_and_product_identification()

static int decode_vendor_and_product_identification ( const uchar edid,
MonitorInfo info 
)
static

Definition at line 59 of file edid-parse.c.

References FALSE, get_bits(), MonitorInfo::manufacturer_code, MonitorInfo::model_year, MonitorInfo::product_code, MonitorInfo::production_week, MonitorInfo::production_year, MonitorInfo::serial_number, and TRUE.

Referenced by decode_edid().

60 {
61  int is_model_year;
62 
63  /* Manufacturer Code */
64  info->manufacturer_code[0] = get_bits (edid[0x08], 2, 6);
65  info->manufacturer_code[1] = get_bits (edid[0x08], 0, 1) << 3;
66  info->manufacturer_code[1] |= get_bits (edid[0x09], 5, 7);
67  info->manufacturer_code[2] = get_bits (edid[0x09], 0, 4);
68  info->manufacturer_code[3] = '\0';
69 
70  info->manufacturer_code[0] += 'A' - 1;
71  info->manufacturer_code[1] += 'A' - 1;
72  info->manufacturer_code[2] += 'A' - 1;
73 
74  /* Product Code */
75  info->product_code = edid[0x0b] << 8 | edid[0x0a];
76 
77  /* Serial Number */
78  info->serial_number =
79  edid[0x0c] | edid[0x0d] << 8 | edid[0x0e] << 16 | edid[0x0f] << 24;
80 
81  /* Week and Year */
82  is_model_year = FALSE;
83  switch (edid[0x10])
84  {
85  case 0x00:
86  info->production_week = -1;
87  break;
88 
89  case 0xff:
90  info->production_week = -1;
91  is_model_year = TRUE;
92  break;
93 
94  default:
95  info->production_week = edid[0x10];
96  break;
97  }
98 
99  if (is_model_year)
100  {
101  info->production_year = -1;
102  info->model_year = 1990 + edid[0x11];
103  }
104  else
105  {
106  info->production_year = 1990 + edid[0x11];
107  info->model_year = -1;
108  }
109 
110  return TRUE;
111 }
int production_week
Definition: edid.h:87
static int get_bits(int in, int begin, int end)
Definition: edid-parse.c:43
char manufacturer_code[4]
Definition: edid.h:83
int product_code
Definition: edid.h:84
int model_year
Definition: edid.h:89
#define TRUE
Definition: edid-parse.c:33
unsigned int serial_number
Definition: edid.h:85
int production_year
Definition: edid.h:88
#define FALSE
Definition: edid-parse.c:34

◆ dump_monitor_info()

void dump_monitor_info ( MonitorInfo info)

Definition at line 551 of file edid-parse.c.

References MonitorInfo::active_off, DetailedTiming::ad, MonitorInfo::ad, DetailedTiming::analog, MonitorInfo::analog, MonitorInfo::aspect_ratio, MonitorInfo::blue_x, MonitorInfo::blue_y, MonitorInfo::checksum, MonitorInfo::continuous_frequency, MonitorInfo::detailed_timings, DetailedTiming::digital, MonitorInfo::digital, DetailedTiming::digital_sync, DISPLAY_PORT, MonitorInfo::dsc_product_name, MonitorInfo::dsc_serial_number, MonitorInfo::dsc_string, DVI, MonitorInfo::established, FIELD_LEFT, FIELD_RIGHT, FOUR_WAY_INTERLEAVED, Timing::frequency, MonitorInfo::gamma, MonitorInfo::green_x, MonitorInfo::green_y, DetailedTiming::h_addr, DetailedTiming::h_blank, DetailedTiming::h_front_porch, DetailedTiming::h_sync, HDMI_A, HDMI_B, Timing::height, DetailedTiming::height_mm, MonitorInfo::height_mm, i, MonitorInfo::is_digital, MonitorInfo::major_version, MonitorInfo::manufacturer_code, MDDI, MonitorInfo::minor_version, MonitorInfo::model_year, MONOCHROME, MonitorInfo::n_detailed_timings, NO_STEREO, OTHER_COLOR, DetailedTiming::pixel_clock, MonitorInfo::preferred_timing_includes_native, MonitorInfo::product_code, MonitorInfo::production_week, MonitorInfo::production_year, MonitorInfo::red_x, MonitorInfo::red_y, RGB, DetailedTiming::right_border, MonitorInfo::serial_number, SIDE_BY_SIDE, MonitorInfo::srgb_is_standard, MonitorInfo::standard, MonitorInfo::standby, DetailedTiming::stereo, MonitorInfo::suspend, DetailedTiming::top_border, TWO_WAY_LEFT_ON_EVEN, TWO_WAY_RIGHT_ON_EVEN, UNDEFINED, UNDEFINED_COLOR, DetailedTiming::v_addr, DetailedTiming::v_blank, DetailedTiming::v_front_porch, DetailedTiming::v_sync, MonitorInfo::white_x, MonitorInfo::white_y, Timing::width, DetailedTiming::width_mm, MonitorInfo::width_mm, and yesno().

552 {
553  int i;
554 
555  printf ("Checksum: %d (%s)\n",
556  info->checksum, info->checksum? "incorrect" : "correct");
557  printf ("Manufacturer Code: %s\n", info->manufacturer_code);
558  printf ("Product Code: 0x%x\n", info->product_code);
559  printf ("Serial Number: %u\n", info->serial_number);
560 
561  if (info->production_week != -1)
562  printf ("Production Week: %d\n", info->production_week);
563  else
564  printf ("Production Week: unspecified\n");
565 
566  if (info->production_year != -1)
567  printf ("Production Year: %d\n", info->production_year);
568  else
569  printf ("Production Year: unspecified\n");
570 
571  if (info->model_year != -1)
572  printf ("Model Year: %d\n", info->model_year);
573  else
574  printf ("Model Year: unspecified\n");
575 
576  printf ("EDID revision: %d.%d\n", info->major_version, info->minor_version);
577 
578  printf ("Display is %s\n", info->is_digital? "digital" : "analog");
579  if (info->is_digital)
580  {
581  const char *interface;
582  if (info->ad.digital.bits_per_primary != -1)
583  printf ("Bits Per Primary: %d\n", info->ad.digital.bits_per_primary);
584  else
585  printf ("Bits Per Primary: undefined\n");
586 
587  switch (info->ad.digital.interface)
588  {
589  case DVI: interface = "DVI"; break;
590  case HDMI_A: interface = "HDMI-a"; break;
591  case HDMI_B: interface = "HDMI-b"; break;
592  case MDDI: interface = "MDDI"; break;
593  case DISPLAY_PORT: interface = "DisplayPort"; break;
594  case UNDEFINED: interface = "undefined"; break;
595  default: interface = "unknown"; break;
596  }
597  printf ("Interface: %s\n", interface);
598 
599  printf ("RGB 4:4:4: %s\n", yesno (info->ad.digital.rgb444));
600  printf ("YCrCb 4:4:4: %s\n", yesno (info->ad.digital.ycrcb444));
601  printf ("YCrCb 4:2:2: %s\n", yesno (info->ad.digital.ycrcb422));
602  }
603  else
604  {
605  const char *s;
606  printf ("Video Signal Level: %f\n", info->ad.analog.video_signal_level);
607  printf ("Sync Signal Level: %f\n", info->ad.analog.sync_signal_level);
608  printf ("Total Signal Level: %f\n", info->ad.analog.total_signal_level);
609 
610  printf ("Blank to Black: %s\n",
611  yesno (info->ad.analog.blank_to_black));
612  printf ("Separate HV Sync: %s\n",
613  yesno (info->ad.analog.separate_hv_sync));
614  printf ("Composite Sync on H: %s\n",
615  yesno (info->ad.analog.composite_sync_on_h));
616  printf ("Serration on VSync: %s\n",
617  yesno (info->ad.analog.serration_on_vsync));
618 
619  switch (info->ad.analog.color_type)
620  {
621  case UNDEFINED_COLOR: s = "undefined"; break;
622  case MONOCHROME: s = "monochrome"; break;
623  case RGB: s = "rgb"; break;
624  case OTHER_COLOR: s = "other color"; break;
625  default: s = "unknown"; break;
626  };
627 
628  printf ("Color: %s\n", s);
629  }
630 
631  if (info->width_mm == -1)
632  printf ("Width: undefined\n");
633  else
634  printf ("Width: %d mm\n", info->width_mm);
635 
636  if (info->height_mm == -1)
637  printf ("Height: undefined\n");
638  else
639  printf ("Height: %d mm\n", info->height_mm);
640 
641  if (info->aspect_ratio > 0)
642  printf ("Aspect Ratio: %f\n", info->aspect_ratio);
643  else
644  printf ("Aspect Ratio: undefined\n");
645 
646  if (info->gamma >= 0)
647  printf ("Gamma: %f\n", info->gamma);
648  else
649  printf ("Gamma: undefined\n");
650 
651  printf ("Standby: %s\n", yesno (info->standby));
652  printf ("Suspend: %s\n", yesno (info->suspend));
653  printf ("Active Off: %s\n", yesno (info->active_off));
654 
655  printf ("SRGB is Standard: %s\n", yesno (info->srgb_is_standard));
656  printf ("Preferred Timing Includes Native: %s\n",
658  printf ("Continuous Frequency: %s\n", yesno (info->continuous_frequency));
659 
660  printf ("Red X: %f\n", info->red_x);
661  printf ("Red Y: %f\n", info->red_y);
662  printf ("Green X: %f\n", info->green_x);
663  printf ("Green Y: %f\n", info->green_y);
664  printf ("Blue X: %f\n", info->blue_x);
665  printf ("Blue Y: %f\n", info->blue_y);
666  printf ("White X: %f\n", info->white_x);
667  printf ("White Y: %f\n", info->white_y);
668 
669  printf ("Established Timings:\n");
670 
671  for (i = 0; i < 24; ++i)
672  {
673  Timing *timing = &(info->established[i]);
674 
675  if (timing->frequency == 0)
676  break;
677 
678  printf (" %d x %d @ %d Hz\n",
679  timing->width, timing->height, timing->frequency);
680 
681  }
682 
683  printf ("Standard Timings:\n");
684  for (i = 0; i < 8; ++i)
685  {
686  Timing *timing = &(info->standard[i]);
687 
688  if (timing->frequency == 0)
689  break;
690 
691  printf (" %d x %d @ %d Hz\n",
692  timing->width, timing->height, timing->frequency);
693  }
694 
695  for (i = 0; i < info->n_detailed_timings; ++i)
696  {
697  DetailedTiming *timing = &(info->detailed_timings[i]);
698  const char *s;
699 
700  printf ("Timing%s: \n",
701  (i == 0 && info->preferred_timing_includes_native)?
702  " (Preferred)" : "");
703  printf (" Pixel Clock: %d\n", timing->pixel_clock);
704  printf (" H Addressable: %d\n", timing->h_addr);
705  printf (" H Blank: %d\n", timing->h_blank);
706  printf (" H Front Porch: %d\n", timing->h_front_porch);
707  printf (" H Sync: %d\n", timing->h_sync);
708  printf (" V Addressable: %d\n", timing->v_addr);
709  printf (" V Blank: %d\n", timing->v_blank);
710  printf (" V Front Porch: %d\n", timing->v_front_porch);
711  printf (" V Sync: %d\n", timing->v_sync);
712  printf (" Width: %d mm\n", timing->width_mm);
713  printf (" Height: %d mm\n", timing->height_mm);
714  printf (" Right Border: %d\n", timing->right_border);
715  printf (" Top Border: %d\n", timing->top_border);
716  switch (timing->stereo)
717  {
718  default:
719  case NO_STEREO: s = "No Stereo"; break;
720  case FIELD_RIGHT: s = "Field Sequential, Right on Sync"; break;
721  case FIELD_LEFT: s = "Field Sequential, Left on Sync"; break;
722  case TWO_WAY_RIGHT_ON_EVEN: s = "Two-way, Right on Even"; break;
723  case TWO_WAY_LEFT_ON_EVEN: s = "Two-way, Left on Even"; break;
724  case FOUR_WAY_INTERLEAVED: s = "Four-way Interleaved"; break;
725  case SIDE_BY_SIDE: s = "Side-by-Side"; break;
726  }
727  printf (" Stereo: %s\n", s);
728 
729  if (timing->digital_sync)
730  {
731  printf (" Digital Sync:\n");
732  printf (" composite: %s\n", yesno (timing->ad.digital.composite));
733  printf (" serrations: %s\n", yesno (timing->ad.digital.serrations));
734  printf (" negative vsync: %s\n",
735  yesno (timing->ad.digital.negative_vsync));
736  printf (" negative hsync: %s\n",
737  yesno (timing->ad.digital.negative_hsync));
738  }
739  else
740  {
741  printf (" Analog Sync:\n");
742  printf (" bipolar: %s\n", yesno (timing->ad.analog.bipolar));
743  printf (" serrations: %s\n", yesno (timing->ad.analog.serrations));
744  printf (" sync on green: %s\n", yesno (
745  timing->ad.analog.sync_on_green));
746  }
747  }
748 
749  printf ("Detailed Product information:\n");
750  printf (" Product Name: %s\n", info->dsc_product_name);
751  printf (" Serial Number: %s\n", info->dsc_serial_number);
752  printf (" Unspecified String: %s\n", info->dsc_string);
753 }
double green_y
Definition: edid.h:140
char dsc_product_name[14]
Definition: edid.h:160
int n_detailed_timings
Definition: edid.h:149
int production_week
Definition: edid.h:87
Definition: edid.h:20
int h_sync
Definition: edid.h:47
int h_front_porch
Definition: edid.h:48
int frequency
Definition: edid.h:39
int height
Definition: edid.h:38
int minor_version
Definition: edid.h:92
GLdouble s
Definition: SDL_opengl.h:2063
Definition: edid.h:8
char manufacturer_code[4]
Definition: edid.h:83
int active_off
Definition: edid.h:131
int suspend
Definition: edid.h:130
int standby
Definition: edid.h:129
struct DetailedTiming::@40::@41 analog
int major_version
Definition: edid.h:91
int height_mm
Definition: edid.h:54
int product_code
Definition: edid.h:84
double white_y
Definition: edid.h:144
int width
Definition: edid.h:37
int checksum
Definition: edid.h:82
Definition: edid.h:10
double red_x
Definition: edid.h:137
struct MonitorInfo::@43::@45 analog
char dsc_string[14]
Definition: edid.h:161
int width_mm
Definition: edid.h:123
int pixel_clock
Definition: edid.h:44
double blue_x
Definition: edid.h:141
union MonitorInfo::@43 ad
Definition: edid.h:35
int model_year
Definition: edid.h:89
Timing standard[8]
Definition: edid.h:147
int digital_sync
Definition: edid.h:60
int top_border
Definition: edid.h:56
int right_border
Definition: edid.h:55
Definition: edid.h:11
struct DetailedTiming::@40::@42 digital
static const char * yesno(int v)
Definition: edid-parse.c:545
int v_front_porch
Definition: edid.h:52
Definition: edid.h:12
int continuous_frequency
Definition: edid.h:135
double aspect_ratio
Definition: edid.h:125
int v_addr
Definition: edid.h:49
int preferred_timing_includes_native
Definition: edid.h:134
Timing established[24]
Definition: edid.h:146
int srgb_is_standard
Definition: edid.h:133
int h_addr
Definition: edid.h:45
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
int v_sync
Definition: edid.h:51
int is_digital
Definition: edid.h:94
struct MonitorInfo::@43::@44 digital
DetailedTiming detailed_timings[4]
Definition: edid.h:150
StereoType stereo
Definition: edid.h:58
int width_mm
Definition: edid.h:53
char dsc_serial_number[14]
Definition: edid.h:159
int height_mm
Definition: edid.h:124
int v_blank
Definition: edid.h:50
Definition: edid.h:9
Definition: edid.h:26
double white_x
Definition: edid.h:143
unsigned int serial_number
Definition: edid.h:85
int production_year
Definition: edid.h:88
GLboolean GLboolean GLboolean GLboolean a
double gamma
Definition: edid.h:127
GLboolean GLboolean GLboolean b
double green_x
Definition: edid.h:139
int h_blank
Definition: edid.h:46
double blue_y
Definition: edid.h:142
double red_y
Definition: edid.h:138
union DetailedTiming::@40 ad

◆ get_bit()

static int get_bit ( int  in,
int  bit 
)
static

Definition at line 37 of file edid-parse.c.

Referenced by decode_detailed_timing(), decode_display_parameters(), decode_established_timings(), and decode_fraction().

38 {
39  return (in & (1 << bit)) >> bit;
40 }
GLuint in

◆ get_bits()

static int get_bits ( int  in,
int  begin,
int  end 
)
static

Definition at line 43 of file edid-parse.c.

Referenced by decode_color_characteristics(), decode_detailed_timing(), decode_display_parameters(), decode_standard_timings(), and decode_vendor_and_product_identification().

44 {
45  int mask = (1 << (end - begin + 1)) - 1;
46 
47  return (in >> begin) & mask;
48 }
GLuint GLuint end
Definition: SDL_opengl.h:1571
GLenum GLint GLuint mask
GLuint in

◆ yesno()

static const char* yesno ( int  v)
static

Definition at line 545 of file edid-parse.c.

Referenced by dump_monitor_info().

546 {
547  return v? "yes" : "no";
548 }
const GLdouble * v
Definition: SDL_opengl.h:2064